Repository: giscafer/mapshaper-plus
Branch: master
Commit: 49981ceefa0a
Files: 14
Total size: 1.1 MB

Directory structure:
gitextract_hdn3tnup/

├── README.md
├── codecs.js
├── deflate.js
├── elements.css
├── encode.js
├── index.html
├── manifest.js
├── mapshaper-gui.js
├── mapshaper.js
├── page.css
├── pako.deflate.js
├── pako.inflate.js
├── z-worker.js
└── zip.js

================================================
FILE CONTENTS
================================================

================================================
FILE: README.md
================================================
# mapshaper-plus

Generate geojson files for [Apache ECharts (incubating)](https://github.com/apache/incubator-echarts) Map,base on mapshaper

基于[mapshaper](https://github.com/mbloch/mapshaper)对geojson地图数据的坐标信息进行压缩编码，并提供可直接生成压缩编码后的echarts map数据格式

通过`mapshaper-plus`可以直接将`shp`格式数据转换为压缩后的echarts数据

## Demo

https://giscafer.github.io/mapshaper-plus/

## Description

**介绍** ——[mapshaper](https://github.com/mbloch/mapshaper)可以将多种数据格式（Shapefile, GeoJSON, TopoJSON
和 Zip files）导入后，对地图的编辑和导出（Shapefile, GeoJSON, TopoJSON, DSV, SVG），功能强大和简单易用。

`mapshaper-plus`是在`mapshaper`基础上拓展对地图坐标信息的压缩编码，很大程度上减小了文件的代码行数和字节大小：譬如一个贵州省的数据，原始的`geojson`数据会在`30M`左右，但在对坐标信息压缩编码后，仅为`1.4M`。

**背景** ——在做echarts图表统计时，需要自制地图数据，但官方没有提供一个平台可以直接将`shp文件`转化为压缩后的`json`或`js`格式的地图文件，而`mapshaper`导出的json数据没有压缩，数据量过大。

使用可以访问[mapshaper-plus在线demo](http://giscafer.github.io/mapshaper-plus/)

## Screenshot

![导出压缩版的数据](https://raw.githubusercontent.com/giscafer/mapshaper-plus/master/images/echarts01.png)

## License

mapshaper is licensed under MPL 2.0. and mapshaper-plus is licensed under MIT.

> Blog [giscafer.com](http://giscafer.com)  · 
> GitHub [@giscafer](https://github.com/giscafer)  · 
> Weibo [@Nickbing Lao](https://weibo.com/laohoubin)



================================================
FILE: codecs.js
================================================
/// wrapper for pako (https://github.com/nodeca/pako)

/* globals pako */
(function(global) {
	"use strict";

	function Codec(isDeflater, options) {
		var newOptions = { raw: true, chunkSize: 1024 * 1024 };
		if (options && typeof options.level === 'number')
			newOptions.level = options.level;
		this._backEnd = isDeflater?
			new pako.Deflate(newOptions) :
			new pako.Inflate(newOptions);
		this._chunks = [];
		this._dataLength = 0;
		this._backEnd.onData = this._onData.bind(this);
	}
	Codec.prototype._onData = function _onData(chunk) {
		this._chunks.push(chunk);
		this._dataLength += chunk.length;
	};
	Codec.prototype._fetchData = function _fetchData() {
		var be = this._backEnd;
		if (be.err !== 0)
			throw new Error(be.msg);
		var chunks = this._chunks;
		var data;
		if (chunks.length === 1)
			data = chunks[0];
		else if (chunks.length > 1) {
			data = new Uint8Array(this._dataLength);
			for (var i = 0, n = chunks.length, off = 0; i < n; i++) {
				var chunk = chunks[i];
				data.set(chunk, off);
				off += chunk.length;
			}
		}
		chunks.length = 0;
		this._dataLength = 0;
		return data;
	};
	Codec.prototype.append = function append(bytes, onprogress) {
		this._backEnd.push(bytes, false);
		return this._fetchData();
	};
	Codec.prototype.flush = function flush() {
		this._backEnd.push(new Uint8Array(0), true);
		return this._fetchData();
	};

	function Deflater(options) {
		Codec.call(this, true, options);
	}
	Deflater.prototype = Object.create(Codec.prototype);
	function Inflater() {
		Codec.call(this, false);
	}
	Inflater.prototype = Object.create(Codec.prototype);

	// 'zip' may not be defined in z-worker and some tests
	var env = global.zip || global;
	env.Deflater = env._pako_Deflater = Deflater;
	env.Inflater = env._pako_Inflater = Inflater;
})(this);

================================================
FILE: deflate.js
================================================
/*
 Copyright (c) 2013 Gildas Lormeau. All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

 1. Redistributions of source code must retain the above copyright notice,
 this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright 
 notice, this list of conditions and the following disclaimer in 
 the documentation and/or other materials provided with the distribution.

 3. The names of the authors may not be used to endorse or promote products
 derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This program is based on JZlib 1.0.2 ymnk, JCraft,Inc.
 * JZlib is based on zlib-1.1.3, so all credit should go authors
 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
 * and contributors of zlib.
 */

(function(global) {
	"use strict";

	// Global

	var MAX_BITS = 15;
	var D_CODES = 30;
	var BL_CODES = 19;

	var LENGTH_CODES = 29;
	var LITERALS = 256;
	var L_CODES = (LITERALS + 1 + LENGTH_CODES);
	var HEAP_SIZE = (2 * L_CODES + 1);

	var END_BLOCK = 256;

	// Bit length codes must not exceed MAX_BL_BITS bits
	var MAX_BL_BITS = 7;

	// repeat previous bit length 3-6 times (2 bits of repeat count)
	var REP_3_6 = 16;

	// repeat a zero length 3-10 times (3 bits of repeat count)
	var REPZ_3_10 = 17;

	// repeat a zero length 11-138 times (7 bits of repeat count)
	var REPZ_11_138 = 18;

	// The lengths of the bit length codes are sent in order of decreasing
	// probability, to avoid transmitting the lengths for unused bit
	// length codes.

	var Buf_size = 8 * 2;

	// JZlib version : "1.0.2"
	var Z_DEFAULT_COMPRESSION = -1;

	// compression strategy
	var Z_FILTERED = 1;
	var Z_HUFFMAN_ONLY = 2;
	var Z_DEFAULT_STRATEGY = 0;

	var Z_NO_FLUSH = 0;
	var Z_PARTIAL_FLUSH = 1;
	var Z_FULL_FLUSH = 3;
	var Z_FINISH = 4;

	var Z_OK = 0;
	var Z_STREAM_END = 1;
	var Z_NEED_DICT = 2;
	var Z_STREAM_ERROR = -2;
	var Z_DATA_ERROR = -3;
	var Z_BUF_ERROR = -5;

	// Tree

	// see definition of array dist_code below
	var _dist_code = [ 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
			10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
			12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
			13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
			14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
			14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
			15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 0, 0, 16, 17, 18, 18, 19, 19,
			20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
			24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
			26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
			27, 27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
			28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 29,
			29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
			29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29 ];

	function Tree() {
		var that = this;

		// dyn_tree; // the dynamic tree
		// max_code; // largest code with non zero frequency
		// stat_desc; // the corresponding static tree

		// Compute the optimal bit lengths for a tree and update the total bit
		// length
		// for the current block.
		// IN assertion: the fields freq and dad are set, heap[heap_max] and
		// above are the tree nodes sorted by increasing frequency.
		// OUT assertions: the field len is set to the optimal bit length, the
		// array bl_count contains the frequencies for each bit length.
		// The length opt_len is updated; static_len is also updated if stree is
		// not null.
		function gen_bitlen(s) {
			var tree = that.dyn_tree;
			var stree = that.stat_desc.static_tree;
			var extra = that.stat_desc.extra_bits;
			var base = that.stat_desc.extra_base;
			var max_length = that.stat_desc.max_length;
			var h; // heap index
			var n, m; // iterate over the tree elements
			var bits; // bit length
			var xbits; // extra bits
			var f; // frequency
			var overflow = 0; // number of elements with bit length too large

			for (bits = 0; bits <= MAX_BITS; bits++)
				s.bl_count[bits] = 0;

			// In a first pass, compute the optimal bit lengths (which may
			// overflow in the case of the bit length tree).
			tree[s.heap[s.heap_max] * 2 + 1] = 0; // root of the heap

			for (h = s.heap_max + 1; h < HEAP_SIZE; h++) {
				n = s.heap[h];
				bits = tree[tree[n * 2 + 1] * 2 + 1] + 1;
				if (bits > max_length) {
					bits = max_length;
					overflow++;
				}
				tree[n * 2 + 1] = bits;
				// We overwrite tree[n*2+1] which is no longer needed

				if (n > that.max_code)
					continue; // not a leaf node

				s.bl_count[bits]++;
				xbits = 0;
				if (n >= base)
					xbits = extra[n - base];
				f = tree[n * 2];
				s.opt_len += f * (bits + xbits);
				if (stree)
					s.static_len += f * (stree[n * 2 + 1] + xbits);
			}
			if (overflow === 0)
				return;

			// This happens for example on obj2 and pic of the Calgary corpus
			// Find the first bit length which could increase:
			do {
				bits = max_length - 1;
				while (s.bl_count[bits] === 0)
					bits--;
				s.bl_count[bits]--; // move one leaf down the tree
				s.bl_count[bits + 1] += 2; // move one overflow item as its brother
				s.bl_count[max_length]--;
				// The brother of the overflow item also moves one step up,
				// but this does not affect bl_count[max_length]
				overflow -= 2;
			} while (overflow > 0);

			for (bits = max_length; bits !== 0; bits--) {
				n = s.bl_count[bits];
				while (n !== 0) {
					m = s.heap[--h];
					if (m > that.max_code)
						continue;
					if (tree[m * 2 + 1] != bits) {
						s.opt_len += (bits - tree[m * 2 + 1]) * tree[m * 2];
						tree[m * 2 + 1] = bits;
					}
					n--;
				}
			}
		}

		// Reverse the first len bits of a code, using straightforward code (a
		// faster
		// method would use a table)
		// IN assertion: 1 <= len <= 15
		function bi_reverse(code, // the value to invert
		len // its bit length
		) {
			var res = 0;
			do {
				res |= code & 1;
				code >>>= 1;
				res <<= 1;
			} while (--len > 0);
			return res >>> 1;
		}

		// Generate the codes for a given tree and bit counts (which need not be
		// optimal).
		// IN assertion: the array bl_count contains the bit length statistics for
		// the given tree and the field len is set for all tree elements.
		// OUT assertion: the field code is set for all tree elements of non
		// zero code length.
		function gen_codes(tree, // the tree to decorate
		max_code, // largest code with non zero frequency
		bl_count // number of codes at each bit length
		) {
			var next_code = []; // next code value for each
			// bit length
			var code = 0; // running code value
			var bits; // bit index
			var n; // code index
			var len;

			// The distribution counts are first used to generate the code values
			// without bit reversal.
			for (bits = 1; bits <= MAX_BITS; bits++) {
				next_code[bits] = code = ((code + bl_count[bits - 1]) << 1);
			}

			// Check that the bit counts in bl_count are consistent. The last code
			// must be all ones.
			// Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
			// "inconsistent bit counts");
			// Tracev((stderr,"\ngen_codes: max_code %d ", max_code));

			for (n = 0; n <= max_code; n++) {
				len = tree[n * 2 + 1];
				if (len === 0)
					continue;
				// Now reverse the bits
				tree[n * 2] = bi_reverse(next_code[len]++, len);
			}
		}

		// Construct one Huffman tree and assigns the code bit strings and lengths.
		// Update the total bit length for the current block.
		// IN assertion: the field freq is set for all tree elements.
		// OUT assertions: the fields len and code are set to the optimal bit length
		// and corresponding code. The length opt_len is updated; static_len is
		// also updated if stree is not null. The field max_code is set.
		that.build_tree = function(s) {
			var tree = that.dyn_tree;
			var stree = that.stat_desc.static_tree;
			var elems = that.stat_desc.elems;
			var n, m; // iterate over heap elements
			var max_code = -1; // largest code with non zero frequency
			var node; // new node being created

			// Construct the initial heap, with least frequent element in
			// heap[1]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
			// heap[0] is not used.
			s.heap_len = 0;
			s.heap_max = HEAP_SIZE;

			for (n = 0; n < elems; n++) {
				if (tree[n * 2] !== 0) {
					s.heap[++s.heap_len] = max_code = n;
					s.depth[n] = 0;
				} else {
					tree[n * 2 + 1] = 0;
				}
			}

			// The pkzip format requires that at least one distance code exists,
			// and that at least one bit should be sent even if there is only one
			// possible code. So to avoid special checks later on we force at least
			// two codes of non zero frequency.
			while (s.heap_len < 2) {
				node = s.heap[++s.heap_len] = max_code < 2 ? ++max_code : 0;
				tree[node * 2] = 1;
				s.depth[node] = 0;
				s.opt_len--;
				if (stree)
					s.static_len -= stree[node * 2 + 1];
				// node is 0 or 1 so it does not have extra bits
			}
			that.max_code = max_code;

			// The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
			// establish sub-heaps of increasing lengths:

			for (n = Math.floor(s.heap_len / 2); n >= 1; n--)
				s.pqdownheap(tree, n);

			// Construct the Huffman tree by repeatedly combining the least two
			// frequent nodes.

			node = elems; // next internal node of the tree
			do {
				// n = node of least frequency
				n = s.heap[1];
				s.heap[1] = s.heap[s.heap_len--];
				s.pqdownheap(tree, 1);
				m = s.heap[1]; // m = node of next least frequency

				s.heap[--s.heap_max] = n; // keep the nodes sorted by frequency
				s.heap[--s.heap_max] = m;

				// Create a new node father of n and m
				tree[node * 2] = (tree[n * 2] + tree[m * 2]);
				s.depth[node] = Math.max(s.depth[n], s.depth[m]) + 1;
				tree[n * 2 + 1] = tree[m * 2 + 1] = node;

				// and insert the new node in the heap
				s.heap[1] = node++;
				s.pqdownheap(tree, 1);
			} while (s.heap_len >= 2);

			s.heap[--s.heap_max] = s.heap[1];

			// At this point, the fields freq and dad are set. We can now
			// generate the bit lengths.

			gen_bitlen(s);

			// The field len is now set, we can generate the bit codes
			gen_codes(tree, that.max_code, s.bl_count);
		};

	}

	Tree._length_code = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16,
			16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20,
			20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
			22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
			24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
			25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
			26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28 ];

	Tree.base_length = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 0 ];

	Tree.base_dist = [ 0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 512, 768, 1024, 1536, 2048, 3072, 4096, 6144, 8192, 12288, 16384,
			24576 ];

	// Mapping from a distance to a distance code. dist is the distance - 1 and
	// must not have side effects. _dist_code[256] and _dist_code[257] are never
	// used.
	Tree.d_code = function(dist) {
		return ((dist) < 256 ? _dist_code[dist] : _dist_code[256 + ((dist) >>> 7)]);
	};

	// extra bits for each length code
	Tree.extra_lbits = [ 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 ];

	// extra bits for each distance code
	Tree.extra_dbits = [ 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13 ];

	// extra bits for each bit length code
	Tree.extra_blbits = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7 ];

	Tree.bl_order = [ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ];

	// StaticTree

	function StaticTree(static_tree, extra_bits, extra_base, elems, max_length) {
		var that = this;
		that.static_tree = static_tree;
		that.extra_bits = extra_bits;
		that.extra_base = extra_base;
		that.elems = elems;
		that.max_length = max_length;
	}

	StaticTree.static_ltree = [ 12, 8, 140, 8, 76, 8, 204, 8, 44, 8, 172, 8, 108, 8, 236, 8, 28, 8, 156, 8, 92, 8, 220, 8, 60, 8, 188, 8, 124, 8, 252, 8, 2, 8,
			130, 8, 66, 8, 194, 8, 34, 8, 162, 8, 98, 8, 226, 8, 18, 8, 146, 8, 82, 8, 210, 8, 50, 8, 178, 8, 114, 8, 242, 8, 10, 8, 138, 8, 74, 8, 202, 8, 42,
			8, 170, 8, 106, 8, 234, 8, 26, 8, 154, 8, 90, 8, 218, 8, 58, 8, 186, 8, 122, 8, 250, 8, 6, 8, 134, 8, 70, 8, 198, 8, 38, 8, 166, 8, 102, 8, 230, 8,
			22, 8, 150, 8, 86, 8, 214, 8, 54, 8, 182, 8, 118, 8, 246, 8, 14, 8, 142, 8, 78, 8, 206, 8, 46, 8, 174, 8, 110, 8, 238, 8, 30, 8, 158, 8, 94, 8,
			222, 8, 62, 8, 190, 8, 126, 8, 254, 8, 1, 8, 129, 8, 65, 8, 193, 8, 33, 8, 161, 8, 97, 8, 225, 8, 17, 8, 145, 8, 81, 8, 209, 8, 49, 8, 177, 8, 113,
			8, 241, 8, 9, 8, 137, 8, 73, 8, 201, 8, 41, 8, 169, 8, 105, 8, 233, 8, 25, 8, 153, 8, 89, 8, 217, 8, 57, 8, 185, 8, 121, 8, 249, 8, 5, 8, 133, 8,
			69, 8, 197, 8, 37, 8, 165, 8, 101, 8, 229, 8, 21, 8, 149, 8, 85, 8, 213, 8, 53, 8, 181, 8, 117, 8, 245, 8, 13, 8, 141, 8, 77, 8, 205, 8, 45, 8,
			173, 8, 109, 8, 237, 8, 29, 8, 157, 8, 93, 8, 221, 8, 61, 8, 189, 8, 125, 8, 253, 8, 19, 9, 275, 9, 147, 9, 403, 9, 83, 9, 339, 9, 211, 9, 467, 9,
			51, 9, 307, 9, 179, 9, 435, 9, 115, 9, 371, 9, 243, 9, 499, 9, 11, 9, 267, 9, 139, 9, 395, 9, 75, 9, 331, 9, 203, 9, 459, 9, 43, 9, 299, 9, 171, 9,
			427, 9, 107, 9, 363, 9, 235, 9, 491, 9, 27, 9, 283, 9, 155, 9, 411, 9, 91, 9, 347, 9, 219, 9, 475, 9, 59, 9, 315, 9, 187, 9, 443, 9, 123, 9, 379,
			9, 251, 9, 507, 9, 7, 9, 263, 9, 135, 9, 391, 9, 71, 9, 327, 9, 199, 9, 455, 9, 39, 9, 295, 9, 167, 9, 423, 9, 103, 9, 359, 9, 231, 9, 487, 9, 23,
			9, 279, 9, 151, 9, 407, 9, 87, 9, 343, 9, 215, 9, 471, 9, 55, 9, 311, 9, 183, 9, 439, 9, 119, 9, 375, 9, 247, 9, 503, 9, 15, 9, 271, 9, 143, 9,
			399, 9, 79, 9, 335, 9, 207, 9, 463, 9, 47, 9, 303, 9, 175, 9, 431, 9, 111, 9, 367, 9, 239, 9, 495, 9, 31, 9, 287, 9, 159, 9, 415, 9, 95, 9, 351, 9,
			223, 9, 479, 9, 63, 9, 319, 9, 191, 9, 447, 9, 127, 9, 383, 9, 255, 9, 511, 9, 0, 7, 64, 7, 32, 7, 96, 7, 16, 7, 80, 7, 48, 7, 112, 7, 8, 7, 72, 7,
			40, 7, 104, 7, 24, 7, 88, 7, 56, 7, 120, 7, 4, 7, 68, 7, 36, 7, 100, 7, 20, 7, 84, 7, 52, 7, 116, 7, 3, 8, 131, 8, 67, 8, 195, 8, 35, 8, 163, 8,
			99, 8, 227, 8 ];

	StaticTree.static_dtree = [ 0, 5, 16, 5, 8, 5, 24, 5, 4, 5, 20, 5, 12, 5, 28, 5, 2, 5, 18, 5, 10, 5, 26, 5, 6, 5, 22, 5, 14, 5, 30, 5, 1, 5, 17, 5, 9, 5,
			25, 5, 5, 5, 21, 5, 13, 5, 29, 5, 3, 5, 19, 5, 11, 5, 27, 5, 7, 5, 23, 5 ];

	StaticTree.static_l_desc = new StaticTree(StaticTree.static_ltree, Tree.extra_lbits, LITERALS + 1, L_CODES, MAX_BITS);

	StaticTree.static_d_desc = new StaticTree(StaticTree.static_dtree, Tree.extra_dbits, 0, D_CODES, MAX_BITS);

	StaticTree.static_bl_desc = new StaticTree(null, Tree.extra_blbits, 0, BL_CODES, MAX_BL_BITS);

	// Deflate

	var MAX_MEM_LEVEL = 9;
	var DEF_MEM_LEVEL = 8;

	function Config(good_length, max_lazy, nice_length, max_chain, func) {
		var that = this;
		that.good_length = good_length;
		that.max_lazy = max_lazy;
		that.nice_length = nice_length;
		that.max_chain = max_chain;
		that.func = func;
	}

	var STORED = 0;
	var FAST = 1;
	var SLOW = 2;
	var config_table = [ new Config(0, 0, 0, 0, STORED), new Config(4, 4, 8, 4, FAST), new Config(4, 5, 16, 8, FAST), new Config(4, 6, 32, 32, FAST),
			new Config(4, 4, 16, 16, SLOW), new Config(8, 16, 32, 32, SLOW), new Config(8, 16, 128, 128, SLOW), new Config(8, 32, 128, 256, SLOW),
			new Config(32, 128, 258, 1024, SLOW), new Config(32, 258, 258, 4096, SLOW) ];

	var z_errmsg = [ "need dictionary", // Z_NEED_DICT
	// 2
	"stream end", // Z_STREAM_END 1
	"", // Z_OK 0
	"", // Z_ERRNO (-1)
	"stream error", // Z_STREAM_ERROR (-2)
	"data error", // Z_DATA_ERROR (-3)
	"", // Z_MEM_ERROR (-4)
	"buffer error", // Z_BUF_ERROR (-5)
	"",// Z_VERSION_ERROR (-6)
	"" ];

	// block not completed, need more input or more output
	var NeedMore = 0;

	// block flush performed
	var BlockDone = 1;

	// finish started, need only more output at next deflate
	var FinishStarted = 2;

	// finish done, accept no more input or output
	var FinishDone = 3;

	// preset dictionary flag in zlib header
	var PRESET_DICT = 0x20;

	var INIT_STATE = 42;
	var BUSY_STATE = 113;
	var FINISH_STATE = 666;

	// The deflate compression method
	var Z_DEFLATED = 8;

	var STORED_BLOCK = 0;
	var STATIC_TREES = 1;
	var DYN_TREES = 2;

	var MIN_MATCH = 3;
	var MAX_MATCH = 258;
	var MIN_LOOKAHEAD = (MAX_MATCH + MIN_MATCH + 1);

	function smaller(tree, n, m, depth) {
		var tn2 = tree[n * 2];
		var tm2 = tree[m * 2];
		return (tn2 < tm2 || (tn2 == tm2 && depth[n] <= depth[m]));
	}

	function Deflate() {

		var that = this;
		var strm; // pointer back to this zlib stream
		var status; // as the name implies
		// pending_buf; // output still pending
		var pending_buf_size; // size of pending_buf
		// pending_out; // next pending byte to output to the stream
		// pending; // nb of bytes in the pending buffer
		var method; // STORED (for zip only) or DEFLATED
		var last_flush; // value of flush param for previous deflate call

		var w_size; // LZ77 window size (32K by default)
		var w_bits; // log2(w_size) (8..16)
		var w_mask; // w_size - 1

		var window;
		// Sliding window. Input bytes are read into the second half of the window,
		// and move to the first half later to keep a dictionary of at least wSize
		// bytes. With this organization, matches are limited to a distance of
		// wSize-MAX_MATCH bytes, but this ensures that IO is always
		// performed with a length multiple of the block size. Also, it limits
		// the window size to 64K, which is quite useful on MSDOS.
		// To do: use the user input buffer as sliding window.

		var window_size;
		// Actual size of window: 2*wSize, except when the user input buffer
		// is directly used as sliding window.

		var prev;
		// Link to older string with same hash index. To limit the size of this
		// array to 64K, this link is maintained only for the last 32K strings.
		// An index in this array is thus a window index modulo 32K.

		var head; // Heads of the hash chains or NIL.

		var ins_h; // hash index of string to be inserted
		var hash_size; // number of elements in hash table
		var hash_bits; // log2(hash_size)
		var hash_mask; // hash_size-1

		// Number of bits by which ins_h must be shifted at each input
		// step. It must be such that after MIN_MATCH steps, the oldest
		// byte no longer takes part in the hash key, that is:
		// hash_shift * MIN_MATCH >= hash_bits
		var hash_shift;

		// Window position at the beginning of the current output block. Gets
		// negative when the window is moved backwards.

		var block_start;

		var match_length; // length of best match
		var prev_match; // previous match
		var match_available; // set if previous match exists
		var strstart; // start of string to insert
		var match_start; // start of matching string
		var lookahead; // number of valid bytes ahead in window

		// Length of the best match at previous step. Matches not greater than this
		// are discarded. This is used in the lazy match evaluation.
		var prev_length;

		// To speed up deflation, hash chains are never searched beyond this
		// length. A higher limit improves compression ratio but degrades the speed.
		var max_chain_length;

		// Attempt to find a better match only when the current match is strictly
		// smaller than this value. This mechanism is used only for compression
		// levels >= 4.
		var max_lazy_match;

		// Insert new strings in the hash table only if the match length is not
		// greater than this length. This saves time but degrades compression.
		// max_insert_length is used only for compression levels <= 3.

		var level; // compression level (1..9)
		var strategy; // favor or force Huffman coding

		// Use a faster search when the previous match is longer than this
		var good_match;

		// Stop searching when current match exceeds this
		var nice_match;

		var dyn_ltree; // literal and length tree
		var dyn_dtree; // distance tree
		var bl_tree; // Huffman tree for bit lengths

		var l_desc = new Tree(); // desc for literal tree
		var d_desc = new Tree(); // desc for distance tree
		var bl_desc = new Tree(); // desc for bit length tree

		// that.heap_len; // number of elements in the heap
		// that.heap_max; // element of largest frequency
		// The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
		// The same heap array is used to build all trees.

		// Depth of each subtree used as tie breaker for trees of equal frequency
		that.depth = [];

		var l_buf; // index for literals or lengths */

		// Size of match buffer for literals/lengths. There are 4 reasons for
		// limiting lit_bufsize to 64K:
		// - frequencies can be kept in 16 bit counters
		// - if compression is not successful for the first block, all input
		// data is still in the window so we can still emit a stored block even
		// when input comes from standard input. (This can also be done for
		// all blocks if lit_bufsize is not greater than 32K.)
		// - if compression is not successful for a file smaller than 64K, we can
		// even emit a stored file instead of a stored block (saving 5 bytes).
		// This is applicable only for zip (not gzip or zlib).
		// - creating new Huffman trees less frequently may not provide fast
		// adaptation to changes in the input data statistics. (Take for
		// example a binary file with poorly compressible code followed by
		// a highly compressible string table.) Smaller buffer sizes give
		// fast adaptation but have of course the overhead of transmitting
		// trees more frequently.
		// - I can't count above 4
		var lit_bufsize;

		var last_lit; // running index in l_buf

		// Buffer for distances. To simplify the code, d_buf and l_buf have
		// the same number of elements. To use different lengths, an extra flag
		// array would be necessary.

		var d_buf; // index of pendig_buf

		// that.opt_len; // bit length of current block with optimal trees
		// that.static_len; // bit length of current block with static trees
		var matches; // number of string matches in current block
		var last_eob_len; // bit length of EOB code for last block

		// Output buffer. bits are inserted starting at the bottom (least
		// significant bits).
		var bi_buf;

		// Number of valid bits in bi_buf. All bits above the last valid bit
		// are always zero.
		var bi_valid;

		// number of codes at each bit length for an optimal tree
		that.bl_count = [];

		// heap used to build the Huffman trees
		that.heap = [];

		dyn_ltree = [];
		dyn_dtree = [];
		bl_tree = [];

		function lm_init() {
			var i;
			window_size = 2 * w_size;

			head[hash_size - 1] = 0;
			for (i = 0; i < hash_size - 1; i++) {
				head[i] = 0;
			}

			// Set the default configuration parameters:
			max_lazy_match = config_table[level].max_lazy;
			good_match = config_table[level].good_length;
			nice_match = config_table[level].nice_length;
			max_chain_length = config_table[level].max_chain;

			strstart = 0;
			block_start = 0;
			lookahead = 0;
			match_length = prev_length = MIN_MATCH - 1;
			match_available = 0;
			ins_h = 0;
		}

		function init_block() {
			var i;
			// Initialize the trees.
			for (i = 0; i < L_CODES; i++)
				dyn_ltree[i * 2] = 0;
			for (i = 0; i < D_CODES; i++)
				dyn_dtree[i * 2] = 0;
			for (i = 0; i < BL_CODES; i++)
				bl_tree[i * 2] = 0;

			dyn_ltree[END_BLOCK * 2] = 1;
			that.opt_len = that.static_len = 0;
			last_lit = matches = 0;
		}

		// Initialize the tree data structures for a new zlib stream.
		function tr_init() {

			l_desc.dyn_tree = dyn_ltree;
			l_desc.stat_desc = StaticTree.static_l_desc;

			d_desc.dyn_tree = dyn_dtree;
			d_desc.stat_desc = StaticTree.static_d_desc;

			bl_desc.dyn_tree = bl_tree;
			bl_desc.stat_desc = StaticTree.static_bl_desc;

			bi_buf = 0;
			bi_valid = 0;
			last_eob_len = 8; // enough lookahead for inflate

			// Initialize the first block of the first file:
			init_block();
		}

		// Restore the heap property by moving down the tree starting at node k,
		// exchanging a node with the smallest of its two sons if necessary,
		// stopping
		// when the heap property is re-established (each father smaller than its
		// two sons).
		that.pqdownheap = function(tree, // the tree to restore
		k // node to move down
		) {
			var heap = that.heap;
			var v = heap[k];
			var j = k << 1; // left son of k
			while (j <= that.heap_len) {
				// Set j to the smallest of the two sons:
				if (j < that.heap_len && smaller(tree, heap[j + 1], heap[j], that.depth)) {
					j++;
				}
				// Exit if v is smaller than both sons
				if (smaller(tree, v, heap[j], that.depth))
					break;

				// Exchange v with the smallest son
				heap[k] = heap[j];
				k = j;
				// And continue down the tree, setting j to the left son of k
				j <<= 1;
			}
			heap[k] = v;
		};

		// Scan a literal or distance tree to determine the frequencies of the codes
		// in the bit length tree.
		function scan_tree(tree,// the tree to be scanned
		max_code // and its largest code of non zero frequency
		) {
			var n; // iterates over all tree elements
			var prevlen = -1; // last emitted length
			var curlen; // length of current code
			var nextlen = tree[0 * 2 + 1]; // length of next code
			var count = 0; // repeat count of the current code
			var max_count = 7; // max repeat count
			var min_count = 4; // min repeat count

			if (nextlen === 0) {
				max_count = 138;
				min_count = 3;
			}
			tree[(max_code + 1) * 2 + 1] = 0xffff; // guard

			for (n = 0; n <= max_code; n++) {
				curlen = nextlen;
				nextlen = tree[(n + 1) * 2 + 1];
				if (++count < max_count && curlen == nextlen) {
					continue;
				} else if (count < min_count) {
					bl_tree[curlen * 2] += count;
				} else if (curlen !== 0) {
					if (curlen != prevlen)
						bl_tree[curlen * 2]++;
					bl_tree[REP_3_6 * 2]++;
				} else if (count <= 10) {
					bl_tree[REPZ_3_10 * 2]++;
				} else {
					bl_tree[REPZ_11_138 * 2]++;
				}
				count = 0;
				prevlen = curlen;
				if (nextlen === 0) {
					max_count = 138;
					min_count = 3;
				} else if (curlen == nextlen) {
					max_count = 6;
					min_count = 3;
				} else {
					max_count = 7;
					min_count = 4;
				}
			}
		}

		// Construct the Huffman tree for the bit lengths and return the index in
		// bl_order of the last bit length code to send.
		function build_bl_tree() {
			var max_blindex; // index of last bit length code of non zero freq

			// Determine the bit length frequencies for literal and distance trees
			scan_tree(dyn_ltree, l_desc.max_code);
			scan_tree(dyn_dtree, d_desc.max_code);

			// Build the bit length tree:
			bl_desc.build_tree(that);
			// opt_len now includes the length of the tree representations, except
			// the lengths of the bit lengths codes and the 5+5+4 bits for the
			// counts.

			// Determine the number of bit length codes to send. The pkzip format
			// requires that at least 4 bit length codes be sent. (appnote.txt says
			// 3 but the actual value used is 4.)
			for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {
				if (bl_tree[Tree.bl_order[max_blindex] * 2 + 1] !== 0)
					break;
			}
			// Update opt_len to include the bit length tree and counts
			that.opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;

			return max_blindex;
		}

		// Output a byte on the stream.
		// IN assertion: there is enough room in pending_buf.
		function put_byte(p) {
			that.pending_buf[that.pending++] = p;
		}

		function put_short(w) {
			put_byte(w & 0xff);
			put_byte((w >>> 8) & 0xff);
		}

		function putShortMSB(b) {
			put_byte((b >> 8) & 0xff);
			put_byte((b & 0xff) & 0xff);
		}

		function send_bits(value, length) {
			var val, len = length;
			if (bi_valid > Buf_size - len) {
				val = value;
				// bi_buf |= (val << bi_valid);
				bi_buf |= ((val << bi_valid) & 0xffff);
				put_short(bi_buf);
				bi_buf = val >>> (Buf_size - bi_valid);
				bi_valid += len - Buf_size;
			} else {
				// bi_buf |= (value) << bi_valid;
				bi_buf |= (((value) << bi_valid) & 0xffff);
				bi_valid += len;
			}
		}

		function send_code(c, tree) {
			var c2 = c * 2;
			send_bits(tree[c2] & 0xffff, tree[c2 + 1] & 0xffff);
		}

		// Send a literal or distance tree in compressed form, using the codes in
		// bl_tree.
		function send_tree(tree,// the tree to be sent
		max_code // and its largest code of non zero frequency
		) {
			var n; // iterates over all tree elements
			var prevlen = -1; // last emitted length
			var curlen; // length of current code
			var nextlen = tree[0 * 2 + 1]; // length of next code
			var count = 0; // repeat count of the current code
			var max_count = 7; // max repeat count
			var min_count = 4; // min repeat count

			if (nextlen === 0) {
				max_count = 138;
				min_count = 3;
			}

			for (n = 0; n <= max_code; n++) {
				curlen = nextlen;
				nextlen = tree[(n + 1) * 2 + 1];
				if (++count < max_count && curlen == nextlen) {
					continue;
				} else if (count < min_count) {
					do {
						send_code(curlen, bl_tree);
					} while (--count !== 0);
				} else if (curlen !== 0) {
					if (curlen != prevlen) {
						send_code(curlen, bl_tree);
						count--;
					}
					send_code(REP_3_6, bl_tree);
					send_bits(count - 3, 2);
				} else if (count <= 10) {
					send_code(REPZ_3_10, bl_tree);
					send_bits(count - 3, 3);
				} else {
					send_code(REPZ_11_138, bl_tree);
					send_bits(count - 11, 7);
				}
				count = 0;
				prevlen = curlen;
				if (nextlen === 0) {
					max_count = 138;
					min_count = 3;
				} else if (curlen == nextlen) {
					max_count = 6;
					min_count = 3;
				} else {
					max_count = 7;
					min_count = 4;
				}
			}
		}

		// Send the header for a block using dynamic Huffman trees: the counts, the
		// lengths of the bit length codes, the literal tree and the distance tree.
		// IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
		function send_all_trees(lcodes, dcodes, blcodes) {
			var rank; // index in bl_order

			send_bits(lcodes - 257, 5); // not +255 as stated in appnote.txt
			send_bits(dcodes - 1, 5);
			send_bits(blcodes - 4, 4); // not -3 as stated in appnote.txt
			for (rank = 0; rank < blcodes; rank++) {
				send_bits(bl_tree[Tree.bl_order[rank] * 2 + 1], 3);
			}
			send_tree(dyn_ltree, lcodes - 1); // literal tree
			send_tree(dyn_dtree, dcodes - 1); // distance tree
		}

		// Flush the bit buffer, keeping at most 7 bits in it.
		function bi_flush() {
			if (bi_valid == 16) {
				put_short(bi_buf);
				bi_buf = 0;
				bi_valid = 0;
			} else if (bi_valid >= 8) {
				put_byte(bi_buf & 0xff);
				bi_buf >>>= 8;
				bi_valid -= 8;
			}
		}

		// Send one empty static block to give enough lookahead for inflate.
		// This takes 10 bits, of which 7 may remain in the bit buffer.
		// The current inflate code requires 9 bits of lookahead. If the
		// last two codes for the previous block (real code plus EOB) were coded
		// on 5 bits or less, inflate may have only 5+3 bits of lookahead to decode
		// the last real code. In this case we send two empty static blocks instead
		// of one. (There are no problems if the previous block is stored or fixed.)
		// To simplify the code, we assume the worst case of last real code encoded
		// on one bit only.
		function _tr_align() {
			send_bits(STATIC_TREES << 1, 3);
			send_code(END_BLOCK, StaticTree.static_ltree);

			bi_flush();

			// Of the 10 bits for the empty block, we have already sent
			// (10 - bi_valid) bits. The lookahead for the last real code (before
			// the EOB of the previous block) was thus at least one plus the length
			// of the EOB plus what we have just sent of the empty static block.
			if (1 + last_eob_len + 10 - bi_valid < 9) {
				send_bits(STATIC_TREES << 1, 3);
				send_code(END_BLOCK, StaticTree.static_ltree);
				bi_flush();
			}
			last_eob_len = 7;
		}

		// Save the match info and tally the frequency counts. Return true if
		// the current block must be flushed.
		function _tr_tally(dist, // distance of matched string
		lc // match length-MIN_MATCH or unmatched char (if dist==0)
		) {
			var out_length, in_length, dcode;
			that.pending_buf[d_buf + last_lit * 2] = (dist >>> 8) & 0xff;
			that.pending_buf[d_buf + last_lit * 2 + 1] = dist & 0xff;

			that.pending_buf[l_buf + last_lit] = lc & 0xff;
			last_lit++;

			if (dist === 0) {
				// lc is the unmatched char
				dyn_ltree[lc * 2]++;
			} else {
				matches++;
				// Here, lc is the match length - MIN_MATCH
				dist--; // dist = match distance - 1
				dyn_ltree[(Tree._length_code[lc] + LITERALS + 1) * 2]++;
				dyn_dtree[Tree.d_code(dist) * 2]++;
			}

			if ((last_lit & 0x1fff) === 0 && level > 2) {
				// Compute an upper bound for the compressed length
				out_length = last_lit * 8;
				in_length = strstart - block_start;
				for (dcode = 0; dcode < D_CODES; dcode++) {
					out_length += dyn_dtree[dcode * 2] * (5 + Tree.extra_dbits[dcode]);
				}
				out_length >>>= 3;
				if ((matches < Math.floor(last_lit / 2)) && out_length < Math.floor(in_length / 2))
					return true;
			}

			return (last_lit == lit_bufsize - 1);
			// We avoid equality with lit_bufsize because of wraparound at 64K
			// on 16 bit machines and because stored blocks are restricted to
			// 64K-1 bytes.
		}

		// Send the block data compressed using the given Huffman trees
		function compress_block(ltree, dtree) {
			var dist; // distance of matched string
			var lc; // match length or unmatched char (if dist === 0)
			var lx = 0; // running index in l_buf
			var code; // the code to send
			var extra; // number of extra bits to send

			if (last_lit !== 0) {
				do {
					dist = ((that.pending_buf[d_buf + lx * 2] << 8) & 0xff00) | (that.pending_buf[d_buf + lx * 2 + 1] & 0xff);
					lc = (that.pending_buf[l_buf + lx]) & 0xff;
					lx++;

					if (dist === 0) {
						send_code(lc, ltree); // send a literal byte
					} else {
						// Here, lc is the match length - MIN_MATCH
						code = Tree._length_code[lc];

						send_code(code + LITERALS + 1, ltree); // send the length
						// code
						extra = Tree.extra_lbits[code];
						if (extra !== 0) {
							lc -= Tree.base_length[code];
							send_bits(lc, extra); // send the extra length bits
						}
						dist--; // dist is now the match distance - 1
						code = Tree.d_code(dist);

						send_code(code, dtree); // send the distance code
						extra = Tree.extra_dbits[code];
						if (extra !== 0) {
							dist -= Tree.base_dist[code];
							send_bits(dist, extra); // send the extra distance bits
						}
					} // literal or match pair ?

					// Check that the overlay between pending_buf and d_buf+l_buf is
					// ok:
				} while (lx < last_lit);
			}

			send_code(END_BLOCK, ltree);
			last_eob_len = ltree[END_BLOCK * 2 + 1];
		}

		// Flush the bit buffer and align the output on a byte boundary
		function bi_windup() {
			if (bi_valid > 8) {
				put_short(bi_buf);
			} else if (bi_valid > 0) {
				put_byte(bi_buf & 0xff);
			}
			bi_buf = 0;
			bi_valid = 0;
		}

		// Copy a stored block, storing first the length and its
		// one's complement if requested.
		function copy_block(buf, // the input data
		len, // its length
		header // true if block header must be written
		) {
			bi_windup(); // align on byte boundary
			last_eob_len = 8; // enough lookahead for inflate

			if (header) {
				put_short(len);
				put_short(~len);
			}

			that.pending_buf.set(window.subarray(buf, buf + len), that.pending);
			that.pending += len;
		}

		// Send a stored block
		function _tr_stored_block(buf, // input block
		stored_len, // length of input block
		eof // true if this is the last block for a file
		) {
			send_bits((STORED_BLOCK << 1) + (eof ? 1 : 0), 3); // send block type
			copy_block(buf, stored_len, true); // with header
		}

		// Determine the best encoding for the current block: dynamic trees, static
		// trees or store, and output the encoded block to the zip file.
		function _tr_flush_block(buf, // input block, or NULL if too old
		stored_len, // length of input block
		eof // true if this is the last block for a file
		) {
			var opt_lenb, static_lenb;// opt_len and static_len in bytes
			var max_blindex = 0; // index of last bit length code of non zero freq

			// Build the Huffman trees unless a stored block is forced
			if (level > 0) {
				// Construct the literal and distance trees
				l_desc.build_tree(that);

				d_desc.build_tree(that);

				// At this point, opt_len and static_len are the total bit lengths
				// of
				// the compressed block data, excluding the tree representations.

				// Build the bit length tree for the above two trees, and get the
				// index
				// in bl_order of the last bit length code to send.
				max_blindex = build_bl_tree();

				// Determine the best encoding. Compute first the block length in
				// bytes
				opt_lenb = (that.opt_len + 3 + 7) >>> 3;
				static_lenb = (that.static_len + 3 + 7) >>> 3;

				if (static_lenb <= opt_lenb)
					opt_lenb = static_lenb;
			} else {
				opt_lenb = static_lenb = stored_len + 5; // force a stored block
			}

			if ((stored_len + 4 <= opt_lenb) && buf != -1) {
				// 4: two words for the lengths
				// The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
				// Otherwise we can't have processed more than WSIZE input bytes
				// since
				// the last block flush, because compression would have been
				// successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
				// transform a block into a stored block.
				_tr_stored_block(buf, stored_len, eof);
			} else if (static_lenb == opt_lenb) {
				send_bits((STATIC_TREES << 1) + (eof ? 1 : 0), 3);
				compress_block(StaticTree.static_ltree, StaticTree.static_dtree);
			} else {
				send_bits((DYN_TREES << 1) + (eof ? 1 : 0), 3);
				send_all_trees(l_desc.max_code + 1, d_desc.max_code + 1, max_blindex + 1);
				compress_block(dyn_ltree, dyn_dtree);
			}

			// The above check is made mod 2^32, for files larger than 512 MB
			// and uLong implemented on 32 bits.

			init_block();

			if (eof) {
				bi_windup();
			}
		}

		function flush_block_only(eof) {
			_tr_flush_block(block_start >= 0 ? block_start : -1, strstart - block_start, eof);
			block_start = strstart;
			strm.flush_pending();
		}

		// Fill the window when the lookahead becomes insufficient.
		// Updates strstart and lookahead.
		//
		// IN assertion: lookahead < MIN_LOOKAHEAD
		// OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
		// At least one byte has been read, or avail_in === 0; reads are
		// performed for at least two bytes (required for the zip translate_eol
		// option -- not supported here).
		function fill_window() {
			var n, m;
			var p;
			var more; // Amount of free space at the end of the window.

			do {
				more = (window_size - lookahead - strstart);

				// Deal with !@#$% 64K limit:
				if (more === 0 && strstart === 0 && lookahead === 0) {
					more = w_size;
				} else if (more == -1) {
					// Very unlikely, but possible on 16 bit machine if strstart ==
					// 0
					// and lookahead == 1 (input done one byte at time)
					more--;

					// If the window is almost full and there is insufficient
					// lookahead,
					// move the upper half to the lower one to make room in the
					// upper half.
				} else if (strstart >= w_size + w_size - MIN_LOOKAHEAD) {
					window.set(window.subarray(w_size, w_size + w_size), 0);

					match_start -= w_size;
					strstart -= w_size; // we now have strstart >= MAX_DIST
					block_start -= w_size;

					// Slide the hash table (could be avoided with 32 bit values
					// at the expense of memory usage). We slide even when level ==
					// 0
					// to keep the hash table consistent if we switch back to level
					// > 0
					// later. (Using level 0 permanently is not an optimal usage of
					// zlib, so we don't care about this pathological case.)

					n = hash_size;
					p = n;
					do {
						m = (head[--p] & 0xffff);
						head[p] = (m >= w_size ? m - w_size : 0);
					} while (--n !== 0);

					n = w_size;
					p = n;
					do {
						m = (prev[--p] & 0xffff);
						prev[p] = (m >= w_size ? m - w_size : 0);
						// If n is not on any hash chain, prev[n] is garbage but
						// its value will never be used.
					} while (--n !== 0);
					more += w_size;
				}

				if (strm.avail_in === 0)
					return;

				// If there was no sliding:
				// strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
				// more == window_size - lookahead - strstart
				// => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
				// => more >= window_size - 2*WSIZE + 2
				// In the BIG_MEM or MMAP case (not yet supported),
				// window_size == input_size + MIN_LOOKAHEAD &&
				// strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
				// Otherwise, window_size == 2*WSIZE so more >= 2.
				// If there was sliding, more >= WSIZE. So in all cases, more >= 2.

				n = strm.read_buf(window, strstart + lookahead, more);
				lookahead += n;

				// Initialize the hash value now that we have some input:
				if (lookahead >= MIN_MATCH) {
					ins_h = window[strstart] & 0xff;
					ins_h = (((ins_h) << hash_shift) ^ (window[strstart + 1] & 0xff)) & hash_mask;
				}
				// If the whole input has less than MIN_MATCH bytes, ins_h is
				// garbage,
				// but this is not important since only literal bytes will be
				// emitted.
			} while (lookahead < MIN_LOOKAHEAD && strm.avail_in !== 0);
		}

		// Copy without compression as much as possible from the input stream,
		// return
		// the current block state.
		// This function does not insert new strings in the dictionary since
		// uncompressible data is probably not useful. This function is used
		// only for the level=0 compression option.
		// NOTE: this function should be optimized to avoid extra copying from
		// window to pending_buf.
		function deflate_stored(flush) {
			// Stored blocks are limited to 0xffff bytes, pending_buf is limited
			// to pending_buf_size, and each stored block has a 5 byte header:

			var max_block_size = 0xffff;
			var max_start;

			if (max_block_size > pending_buf_size - 5) {
				max_block_size = pending_buf_size - 5;
			}

			// Copy as much as possible from input to output:
			while (true) {
				// Fill the window as much as possible:
				if (lookahead <= 1) {
					fill_window();
					if (lookahead === 0 && flush == Z_NO_FLUSH)
						return NeedMore;
					if (lookahead === 0)
						break; // flush the current block
				}

				strstart += lookahead;
				lookahead = 0;

				// Emit a stored block if pending_buf will be full:
				max_start = block_start + max_block_size;
				if (strstart === 0 || strstart >= max_start) {
					// strstart === 0 is possible when wraparound on 16-bit machine
					lookahead = (strstart - max_start);
					strstart = max_start;

					flush_block_only(false);
					if (strm.avail_out === 0)
						return NeedMore;

				}

				// Flush if we may have to slide, otherwise block_start may become
				// negative and the data will be gone:
				if (strstart - block_start >= w_size - MIN_LOOKAHEAD) {
					flush_block_only(false);
					if (strm.avail_out === 0)
						return NeedMore;
				}
			}

			flush_block_only(flush == Z_FINISH);
			if (strm.avail_out === 0)
				return (flush == Z_FINISH) ? FinishStarted : NeedMore;

			return flush == Z_FINISH ? FinishDone : BlockDone;
		}

		function longest_match(cur_match) {
			var chain_length = max_chain_length; // max hash chain length
			var scan = strstart; // current string
			var match; // matched string
			var len; // length of current match
			var best_len = prev_length; // best match length so far
			var limit = strstart > (w_size - MIN_LOOKAHEAD) ? strstart - (w_size - MIN_LOOKAHEAD) : 0;
			var _nice_match = nice_match;

			// Stop when cur_match becomes <= limit. To simplify the code,
			// we prevent matches with the string of window index 0.

			var wmask = w_mask;

			var strend = strstart + MAX_MATCH;
			var scan_end1 = window[scan + best_len - 1];
			var scan_end = window[scan + best_len];

			// The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of
			// 16.
			// It is easy to get rid of this optimization if necessary.

			// Do not waste too much time if we already have a good match:
			if (prev_length >= good_match) {
				chain_length >>= 2;
			}

			// Do not look for matches beyond the end of the input. This is
			// necessary
			// to make deflate deterministic.
			if (_nice_match > lookahead)
				_nice_match = lookahead;

			do {
				match = cur_match;

				// Skip to next match if the match length cannot increase
				// or if the match length is less than 2:
				if (window[match + best_len] != scan_end || window[match + best_len - 1] != scan_end1 || window[match] != window[scan]
						|| window[++match] != window[scan + 1])
					continue;

				// The check at best_len-1 can be removed because it will be made
				// again later. (This heuristic is not always a win.)
				// It is not necessary to compare scan[2] and match[2] since they
				// are always equal when the other bytes match, given that
				// the hash keys are equal and that HASH_BITS >= 8.
				scan += 2;
				match++;

				// We check for insufficient lookahead only every 8th comparison;
				// the 256th check will be made at strstart+258.
				do {
				} while (window[++scan] == window[++match] && window[++scan] == window[++match] && window[++scan] == window[++match]
						&& window[++scan] == window[++match] && window[++scan] == window[++match] && window[++scan] == window[++match]
						&& window[++scan] == window[++match] && window[++scan] == window[++match] && scan < strend);

				len = MAX_MATCH - (strend - scan);
				scan = strend - MAX_MATCH;

				if (len > best_len) {
					match_start = cur_match;
					best_len = len;
					if (len >= _nice_match)
						break;
					scan_end1 = window[scan + best_len - 1];
					scan_end = window[scan + best_len];
				}

			} while ((cur_match = (prev[cur_match & wmask] & 0xffff)) > limit && --chain_length !== 0);

			if (best_len <= lookahead)
				return best_len;
			return lookahead;
		}

		// Compress as much as possible from the input stream, return the current
		// block state.
		// This function does not perform lazy evaluation of matches and inserts
		// new strings in the dictionary only for unmatched strings or for short
		// matches. It is used only for the fast compression options.
		function deflate_fast(flush) {
			// short hash_head = 0; // head of the hash chain
			var hash_head = 0; // head of the hash chain
			var bflush; // set if current block must be flushed

			while (true) {
				// Make sure that we always have enough lookahead, except
				// at the end of the input file. We need MAX_MATCH bytes
				// for the next match, plus MIN_MATCH bytes to insert the
				// string following the next match.
				if (lookahead < MIN_LOOKAHEAD) {
					fill_window();
					if (lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
						return NeedMore;
					}
					if (lookahead === 0)
						break; // flush the current block
				}

				// Insert the string window[strstart .. strstart+2] in the
				// dictionary, and set hash_head to the head of the hash chain:
				if (lookahead >= MIN_MATCH) {
					ins_h = (((ins_h) << hash_shift) ^ (window[(strstart) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;

					// prev[strstart&w_mask]=hash_head=head[ins_h];
					hash_head = (head[ins_h] & 0xffff);
					prev[strstart & w_mask] = head[ins_h];
					head[ins_h] = strstart;
				}

				// Find the longest match, discarding those <= prev_length.
				// At this point we have always match_length < MIN_MATCH

				if (hash_head !== 0 && ((strstart - hash_head) & 0xffff) <= w_size - MIN_LOOKAHEAD) {
					// To simplify the code, we prevent matches with the string
					// of window index 0 (in particular we have to avoid a match
					// of the string with itself at the start of the input file).
					if (strategy != Z_HUFFMAN_ONLY) {
						match_length = longest_match(hash_head);
					}
					// longest_match() sets match_start
				}
				if (match_length >= MIN_MATCH) {
					// check_match(strstart, match_start, match_length);

					bflush = _tr_tally(strstart - match_start, match_length - MIN_MATCH);

					lookahead -= match_length;

					// Insert new strings in the hash table only if the match length
					// is not too large. This saves time but degrades compression.
					if (match_length <= max_lazy_match && lookahead >= MIN_MATCH) {
						match_length--; // string at strstart already in hash table
						do {
							strstart++;

							ins_h = ((ins_h << hash_shift) ^ (window[(strstart) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;
							// prev[strstart&w_mask]=hash_head=head[ins_h];
							hash_head = (head[ins_h] & 0xffff);
							prev[strstart & w_mask] = head[ins_h];
							head[ins_h] = strstart;

							// strstart never exceeds WSIZE-MAX_MATCH, so there are
							// always MIN_MATCH bytes ahead.
						} while (--match_length !== 0);
						strstart++;
					} else {
						strstart += match_length;
						match_length = 0;
						ins_h = window[strstart] & 0xff;

						ins_h = (((ins_h) << hash_shift) ^ (window[strstart + 1] & 0xff)) & hash_mask;
						// If lookahead < MIN_MATCH, ins_h is garbage, but it does
						// not
						// matter since it will be recomputed at next deflate call.
					}
				} else {
					// No match, output a literal byte

					bflush = _tr_tally(0, window[strstart] & 0xff);
					lookahead--;
					strstart++;
				}
				if (bflush) {

					flush_block_only(false);
					if (strm.avail_out === 0)
						return NeedMore;
				}
			}

			flush_block_only(flush == Z_FINISH);
			if (strm.avail_out === 0) {
				if (flush == Z_FINISH)
					return FinishStarted;
				else
					return NeedMore;
			}
			return flush == Z_FINISH ? FinishDone : BlockDone;
		}

		// Same as above, but achieves better compression. We use a lazy
		// evaluation for matches: a match is finally adopted only if there is
		// no better match at the next window position.
		function deflate_slow(flush) {
			// short hash_head = 0; // head of hash chain
			var hash_head = 0; // head of hash chain
			var bflush; // set if current block must be flushed
			var max_insert;

			// Process the input block.
			while (true) {
				// Make sure that we always have enough lookahead, except
				// at the end of the input file. We need MAX_MATCH bytes
				// for the next match, plus MIN_MATCH bytes to insert the
				// string following the next match.

				if (lookahead < MIN_LOOKAHEAD) {
					fill_window();
					if (lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
						return NeedMore;
					}
					if (lookahead === 0)
						break; // flush the current block
				}

				// Insert the string window[strstart .. strstart+2] in the
				// dictionary, and set hash_head to the head of the hash chain:

				if (lookahead >= MIN_MATCH) {
					ins_h = (((ins_h) << hash_shift) ^ (window[(strstart) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;
					// prev[strstart&w_mask]=hash_head=head[ins_h];
					hash_head = (head[ins_h] & 0xffff);
					prev[strstart & w_mask] = head[ins_h];
					head[ins_h] = strstart;
				}

				// Find the longest match, discarding those <= prev_length.
				prev_length = match_length;
				prev_match = match_start;
				match_length = MIN_MATCH - 1;

				if (hash_head !== 0 && prev_length < max_lazy_match && ((strstart - hash_head) & 0xffff) <= w_size - MIN_LOOKAHEAD) {
					// To simplify the code, we prevent matches with the string
					// of window index 0 (in particular we have to avoid a match
					// of the string with itself at the start of the input file).

					if (strategy != Z_HUFFMAN_ONLY) {
						match_length = longest_match(hash_head);
					}
					// longest_match() sets match_start

					if (match_length <= 5 && (strategy == Z_FILTERED || (match_length == MIN_MATCH && strstart - match_start > 4096))) {

						// If prev_match is also MIN_MATCH, match_start is garbage
						// but we will ignore the current match anyway.
						match_length = MIN_MATCH - 1;
					}
				}

				// If there was a match at the previous step and the current
				// match is not better, output the previous match:
				if (prev_length >= MIN_MATCH && match_length <= prev_length) {
					max_insert = strstart + lookahead - MIN_MATCH;
					// Do not insert strings in hash table beyond this.

					// check_match(strstart-1, prev_match, prev_length);

					bflush = _tr_tally(strstart - 1 - prev_match, prev_length - MIN_MATCH);

					// Insert in hash table all strings up to the end of the match.
					// strstart-1 and strstart are already inserted. If there is not
					// enough lookahead, the last two strings are not inserted in
					// the hash table.
					lookahead -= prev_length - 1;
					prev_length -= 2;
					do {
						if (++strstart <= max_insert) {
							ins_h = (((ins_h) << hash_shift) ^ (window[(strstart) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;
							// prev[strstart&w_mask]=hash_head=head[ins_h];
							hash_head = (head[ins_h] & 0xffff);
							prev[strstart & w_mask] = head[ins_h];
							head[ins_h] = strstart;
						}
					} while (--prev_length !== 0);
					match_available = 0;
					match_length = MIN_MATCH - 1;
					strstart++;

					if (bflush) {
						flush_block_only(false);
						if (strm.avail_out === 0)
							return NeedMore;
					}
				} else if (match_available !== 0) {

					// If there was no match at the previous position, output a
					// single literal. If there was a match but the current match
					// is longer, truncate the previous match to a single literal.

					bflush = _tr_tally(0, window[strstart - 1] & 0xff);

					if (bflush) {
						flush_block_only(false);
					}
					strstart++;
					lookahead--;
					if (strm.avail_out === 0)
						return NeedMore;
				} else {
					// There is no previous match to compare with, wait for
					// the next step to decide.

					match_available = 1;
					strstart++;
					lookahead--;
				}
			}

			if (match_available !== 0) {
				bflush = _tr_tally(0, window[strstart - 1] & 0xff);
				match_available = 0;
			}
			flush_block_only(flush == Z_FINISH);

			if (strm.avail_out === 0) {
				if (flush == Z_FINISH)
					return FinishStarted;
				else
					return NeedMore;
			}

			return flush == Z_FINISH ? FinishDone : BlockDone;
		}

		function deflateReset(strm) {
			strm.total_in = strm.total_out = 0;
			strm.msg = null; //
			
			that.pending = 0;
			that.pending_out = 0;

			status = BUSY_STATE;

			last_flush = Z_NO_FLUSH;

			tr_init();
			lm_init();
			return Z_OK;
		}

		that.deflateInit = function(strm, _level, bits, _method, memLevel, _strategy) {
			if (!_method)
				_method = Z_DEFLATED;
			if (!memLevel)
				memLevel = DEF_MEM_LEVEL;
			if (!_strategy)
				_strategy = Z_DEFAULT_STRATEGY;

			// byte[] my_version=ZLIB_VERSION;

			//
			// if (!version || version[0] != my_version[0]
			// || stream_size != sizeof(z_stream)) {
			// return Z_VERSION_ERROR;
			// }

			strm.msg = null;

			if (_level == Z_DEFAULT_COMPRESSION)
				_level = 6;

			if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || _method != Z_DEFLATED || bits < 9 || bits > 15 || _level < 0 || _level > 9 || _strategy < 0
					|| _strategy > Z_HUFFMAN_ONLY) {
				return Z_STREAM_ERROR;
			}

			strm.dstate = that;

			w_bits = bits;
			w_size = 1 << w_bits;
			w_mask = w_size - 1;

			hash_bits = memLevel + 7;
			hash_size = 1 << hash_bits;
			hash_mask = hash_size - 1;
			hash_shift = Math.floor((hash_bits + MIN_MATCH - 1) / MIN_MATCH);

			window = new Uint8Array(w_size * 2);
			prev = [];
			head = [];

			lit_bufsize = 1 << (memLevel + 6); // 16K elements by default

			// We overlay pending_buf and d_buf+l_buf. This works since the average
			// output size for (length,distance) codes is <= 24 bits.
			that.pending_buf = new Uint8Array(lit_bufsize * 4);
			pending_buf_size = lit_bufsize * 4;

			d_buf = Math.floor(lit_bufsize / 2);
			l_buf = (1 + 2) * lit_bufsize;

			level = _level;

			strategy = _strategy;
			method = _method & 0xff;

			return deflateReset(strm);
		};

		that.deflateEnd = function() {
			if (status != INIT_STATE && status != BUSY_STATE && status != FINISH_STATE) {
				return Z_STREAM_ERROR;
			}
			// Deallocate in reverse order of allocations:
			that.pending_buf = null;
			head = null;
			prev = null;
			window = null;
			// free
			that.dstate = null;
			return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
		};

		that.deflateParams = function(strm, _level, _strategy) {
			var err = Z_OK;

			if (_level == Z_DEFAULT_COMPRESSION) {
				_level = 6;
			}
			if (_level < 0 || _level > 9 || _strategy < 0 || _strategy > Z_HUFFMAN_ONLY) {
				return Z_STREAM_ERROR;
			}

			if (config_table[level].func != config_table[_level].func && strm.total_in !== 0) {
				// Flush the last buffer:
				err = strm.deflate(Z_PARTIAL_FLUSH);
			}

			if (level != _level) {
				level = _level;
				max_lazy_match = config_table[level].max_lazy;
				good_match = config_table[level].good_length;
				nice_match = config_table[level].nice_length;
				max_chain_length = config_table[level].max_chain;
			}
			strategy = _strategy;
			return err;
		};

		that.deflateSetDictionary = function(strm, dictionary, dictLength) {
			var length = dictLength;
			var n, index = 0;

			if (!dictionary || status != INIT_STATE)
				return Z_STREAM_ERROR;

			if (length < MIN_MATCH)
				return Z_OK;
			if (length > w_size - MIN_LOOKAHEAD) {
				length = w_size - MIN_LOOKAHEAD;
				index = dictLength - length; // use the tail of the dictionary
			}
			window.set(dictionary.subarray(index, index + length), 0);

			strstart = length;
			block_start = length;

			// Insert all strings in the hash table (except for the last two bytes).
			// s->lookahead stays null, so s->ins_h will be recomputed at the next
			// call of fill_window.

			ins_h = window[0] & 0xff;
			ins_h = (((ins_h) << hash_shift) ^ (window[1] & 0xff)) & hash_mask;

			for (n = 0; n <= length - MIN_MATCH; n++) {
				ins_h = (((ins_h) << hash_shift) ^ (window[(n) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;
				prev[n & w_mask] = head[ins_h];
				head[ins_h] = n;
			}
			return Z_OK;
		};

		that.deflate = function(_strm, flush) {
			var i, header, level_flags, old_flush, bstate;

			if (flush > Z_FINISH || flush < 0) {
				return Z_STREAM_ERROR;
			}

			if (!_strm.next_out || (!_strm.next_in && _strm.avail_in !== 0) || (status == FINISH_STATE && flush != Z_FINISH)) {
				_strm.msg = z_errmsg[Z_NEED_DICT - (Z_STREAM_ERROR)];
				return Z_STREAM_ERROR;
			}
			if (_strm.avail_out === 0) {
				_strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
				return Z_BUF_ERROR;
			}

			strm = _strm; // just in case
			old_flush = last_flush;
			last_flush = flush;

			// Write the zlib header
			if (status == INIT_STATE) {
				header = (Z_DEFLATED + ((w_bits - 8) << 4)) << 8;
				level_flags = ((level - 1) & 0xff) >> 1;

				if (level_flags > 3)
					level_flags = 3;
				header |= (level_flags << 6);
				if (strstart !== 0)
					header |= PRESET_DICT;
				header += 31 - (header % 31);

				status = BUSY_STATE;
				putShortMSB(header);
			}

			// Flush as much pending output as possible
			if (that.pending !== 0) {
				strm.flush_pending();
				if (strm.avail_out === 0) {
					// console.log(" avail_out==0");
					// Since avail_out is 0, deflate will be called again with
					// more output space, but possibly with both pending and
					// avail_in equal to zero. There won't be anything to do,
					// but this is not an error situation so make sure we
					// return OK instead of BUF_ERROR at next call of deflate:
					last_flush = -1;
					return Z_OK;
				}

				// Make sure there is something to do and avoid duplicate
				// consecutive
				// flushes. For repeated and useless calls with Z_FINISH, we keep
				// returning Z_STREAM_END instead of Z_BUFF_ERROR.
			} else if (strm.avail_in === 0 && flush <= old_flush && flush != Z_FINISH) {
				strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
				return Z_BUF_ERROR;
			}

			// User must not provide more input after the first FINISH:
			if (status == FINISH_STATE && strm.avail_in !== 0) {
				_strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
				return Z_BUF_ERROR;
			}

			// Start a new block or continue the current one.
			if (strm.avail_in !== 0 || lookahead !== 0 || (flush != Z_NO_FLUSH && status != FINISH_STATE)) {
				bstate = -1;
				switch (config_table[level].func) {
				case STORED:
					bstate = deflate_stored(flush);
					break;
				case FAST:
					bstate = deflate_fast(flush);
					break;
				case SLOW:
					bstate = deflate_slow(flush);
					break;
				default:
				}

				if (bstate == FinishStarted || bstate == FinishDone) {
					status = FINISH_STATE;
				}
				if (bstate == NeedMore || bstate == FinishStarted) {
					if (strm.avail_out === 0) {
						last_flush = -1; // avoid BUF_ERROR next call, see above
					}
					return Z_OK;
					// If flush != Z_NO_FLUSH && avail_out === 0, the next call
					// of deflate should use the same flush parameter to make sure
					// that the flush is complete. So we don't have to output an
					// empty block here, this will be done at next call. This also
					// ensures that for a very small output buffer, we emit at most
					// one empty block.
				}

				if (bstate == BlockDone) {
					if (flush == Z_PARTIAL_FLUSH) {
						_tr_align();
					} else { // FULL_FLUSH or SYNC_FLUSH
						_tr_stored_block(0, 0, false);
						// For a full flush, this empty block will be recognized
						// as a special marker by inflate_sync().
						if (flush == Z_FULL_FLUSH) {
							// state.head[s.hash_size-1]=0;
							for (i = 0; i < hash_size/*-1*/; i++)
								// forget history
								head[i] = 0;
						}
					}
					strm.flush_pending();
					if (strm.avail_out === 0) {
						last_flush = -1; // avoid BUF_ERROR at next call, see above
						return Z_OK;
					}
				}
			}

			if (flush != Z_FINISH)
				return Z_OK;
			return Z_STREAM_END;
		};
	}

	// ZStream

	function ZStream() {
		var that = this;
		that.next_in_index = 0;
		that.next_out_index = 0;
		// that.next_in; // next input byte
		that.avail_in = 0; // number of bytes available at next_in
		that.total_in = 0; // total nb of input bytes read so far
		// that.next_out; // next output byte should be put there
		that.avail_out = 0; // remaining free space at next_out
		that.total_out = 0; // total nb of bytes output so far
		// that.msg;
		// that.dstate;
	}

	ZStream.prototype = {
		deflateInit : function(level, bits) {
			var that = this;
			that.dstate = new Deflate();
			if (!bits)
				bits = MAX_BITS;
			return that.dstate.deflateInit(that, level, bits);
		},

		deflate : function(flush) {
			var that = this;
			if (!that.dstate) {
				return Z_STREAM_ERROR;
			}
			return that.dstate.deflate(that, flush);
		},

		deflateEnd : function() {
			var that = this;
			if (!that.dstate)
				return Z_STREAM_ERROR;
			var ret = that.dstate.deflateEnd();
			that.dstate = null;
			return ret;
		},

		deflateParams : function(level, strategy) {
			var that = this;
			if (!that.dstate)
				return Z_STREAM_ERROR;
			return that.dstate.deflateParams(that, level, strategy);
		},

		deflateSetDictionary : function(dictionary, dictLength) {
			var that = this;
			if (!that.dstate)
				return Z_STREAM_ERROR;
			return that.dstate.deflateSetDictionary(that, dictionary, dictLength);
		},

		// Read a new buffer from the current input stream, update the
		// total number of bytes read. All deflate() input goes through
		// this function so some applications may wish to modify it to avoid
		// allocating a large strm->next_in buffer and copying from it.
		// (See also flush_pending()).
		read_buf : function(buf, start, size) {
			var that = this;
			var len = that.avail_in;
			if (len > size)
				len = size;
			if (len === 0)
				return 0;
			that.avail_in -= len;
			buf.set(that.next_in.subarray(that.next_in_index, that.next_in_index + len), start);
			that.next_in_index += len;
			that.total_in += len;
			return len;
		},

		// Flush as much pending output as possible. All deflate() output goes
		// through this function so some applications may wish to modify it
		// to avoid allocating a large strm->next_out buffer and copying into it.
		// (See also read_buf()).
		flush_pending : function() {
			var that = this;
			var len = that.dstate.pending;

			if (len > that.avail_out)
				len = that.avail_out;
			if (len === 0)
				return;

			// if (that.dstate.pending_buf.length <= that.dstate.pending_out || that.next_out.length <= that.next_out_index
			// || that.dstate.pending_buf.length < (that.dstate.pending_out + len) || that.next_out.length < (that.next_out_index +
			// len)) {
			// console.log(that.dstate.pending_buf.length + ", " + that.dstate.pending_out + ", " + that.next_out.length + ", " +
			// that.next_out_index + ", " + len);
			// console.log("avail_out=" + that.avail_out);
			// }

			that.next_out.set(that.dstate.pending_buf.subarray(that.dstate.pending_out, that.dstate.pending_out + len), that.next_out_index);

			that.next_out_index += len;
			that.dstate.pending_out += len;
			that.total_out += len;
			that.avail_out -= len;
			that.dstate.pending -= len;
			if (that.dstate.pending === 0) {
				that.dstate.pending_out = 0;
			}
		}
	};

	// Deflater

	function Deflater(options) {
		var that = this;
		var z = new ZStream();
		var bufsize = 512;
		var flush = Z_NO_FLUSH;
		var buf = new Uint8Array(bufsize);
		var level = options ? options.level : Z_DEFAULT_COMPRESSION;
		if (typeof level == "undefined")
			level = Z_DEFAULT_COMPRESSION;
		z.deflateInit(level);
		z.next_out = buf;

		that.append = function(data, onprogress) {
			var err, buffers = [], lastIndex = 0, bufferIndex = 0, bufferSize = 0, array;
			if (!data.length)
				return;
			z.next_in_index = 0;
			z.next_in = data;
			z.avail_in = data.length;
			do {
				z.next_out_index = 0;
				z.avail_out = bufsize;
				err = z.deflate(flush);
				if (err != Z_OK)
					throw new Error("deflating: " + z.msg);
				if (z.next_out_index)
					if (z.next_out_index == bufsize)
						buffers.push(new Uint8Array(buf));
					else
						buffers.push(new Uint8Array(buf.subarray(0, z.next_out_index)));
				bufferSize += z.next_out_index;
				if (onprogress && z.next_in_index > 0 && z.next_in_index != lastIndex) {
					onprogress(z.next_in_index);
					lastIndex = z.next_in_index;
				}
			} while (z.avail_in > 0 || z.avail_out === 0);
			array = new Uint8Array(bufferSize);
			buffers.forEach(function(chunk) {
				array.set(chunk, bufferIndex);
				bufferIndex += chunk.length;
			});
			return array;
		};
		that.flush = function() {
			var err, buffers = [], bufferIndex = 0, bufferSize = 0, array;
			do {
				z.next_out_index = 0;
				z.avail_out = bufsize;
				err = z.deflate(Z_FINISH);
				if (err != Z_STREAM_END && err != Z_OK)
					throw new Error("deflating: " + z.msg);
				if (bufsize - z.avail_out > 0)
					buffers.push(new Uint8Array(buf.subarray(0, z.next_out_index)));
				bufferSize += z.next_out_index;
			} while (z.avail_in > 0 || z.avail_out === 0);
			z.deflateEnd();
			array = new Uint8Array(bufferSize);
			buffers.forEach(function(chunk) {
				array.set(chunk, bufferIndex);
				bufferIndex += chunk.length;
			});
			return array;
		};
	}

	// 'zip' may not be defined in z-worker and some tests
	var env = global.zip || global;
	env.Deflater = env._jzlib_Deflater = Deflater;
})(this);


================================================
FILE: elements.css
================================================

/* Hide Firefox's indicator when images are loading */
img:-moz-loading {
    visibility: hidden;
}

/* ------ UTILITY ---------- */

.hidden {
	display: none;
}

div.tip {
	color: #555;
	font-weight: normal;
	text-align: left;
	position: relative;
	display: inline-block;
	font-size: 13px;
	line-height: 1.45;
	background: #fff;
	border: 1px solid #a2a2a2;
	border-radius: 6px;
	padding: 8px 11px 9px 11px;
	bottom: 0px;
	left: -50%;
	margin-right: 9px;
	white-space: pre;
	box-shadow: 0 0px 10px rgba(0, 0, 0, 0.15);
}

/* tail */
.tip:after, .tip:before {
	top: 100%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}

/* tail fg */
.tip:after {
	border-color: rgba(136, 183, 213, 0);
	border-top-color: #fff;
	border-width: 8px;
	left: 50%;
	margin-left: -8px;
}

/* tail bg */
.tip:before {
	border-color: rgba(194, 225, 245, 0);
	border-top-color: #999;
	border-width: 9px;
	left: 50%;
	margin-left: -9px;
}


.tip-button {
	float: right;
	margin-top: 2px;
	display:inline-block;
	position: relative;
	z-index: 500;
	cursor: pointer;
	text-align: center;
	font-size: 13px;
	line-height: 1;
	font-weight: normal;
	color: #799FCB;
}

.tip-button .tip-anchor {
	bottom: 24px;
	left: 8px;
}

.tip-anchor {
	visibility: hidden;
	position: absolute;
	bottom: 0;
	left: 0;
}

.tip-button:hover {
	font-weight: bold;
	color: #033D6D;
}

.tip-button:hover * {
	visibility: visible;
}

.clicktext {
	display:inline-block;
	line-height: 1;
	cursor: pointer;
	border: none;
	outline: none;
	padding: 0;
	margin: 0;
	text-decoration:none;
	text-indent: 0px;
}

.file-control {
	position: absolute;
	top: -1000px;
}

/* -------- BUTTONS ---------- */

.header-btn {
	color: #fff;
	border: none;
	padding: 3px 7px 4px 7px;
	border-radius: 3px;
	margin-top: 5px;
}

.page-header .header-btn.disabled,
.page-header .header-btn.disabled:hover {
	background-color: transparent;
}

.page-header .header-btn.active {
	background-color: black;
}

.btn.active {
	cursor: pointer;
}

.btn.selected,
.btn.selected:hover {
	color: #aaa;
	background: none;
}

.btn.inline-btn:hover:not(.selected) {
	background-color: #FFFCDC;
}

.btn {
	text-align: center;
	padding: 4px 7px 5px 7px;
	border-radius: 4px;
	line-height: 1;
	display: inline-block;
	cursor: pointer;
}

.btn.disabled {
	cursor: default;
}


.dialog-btn {
	display: inline-block;
	margin-bottom: 4px;
	margin-top: 1px;
	font-size: 13px;
	color: white;
	min-width: 28px;
}

.inline-btn {
	margin: 0;
	border: 1px solid #999;
	padding: 1px 4px 3px 3px;
}

.text-btn {
	cursor: pointer;
}

.text-btn.disabled {
	cursor: auto;
	color: #999;
}




================================================
FILE: encode.js
================================================
/**
 * https://github.com/giscafer/mapshaper-plus
 * 对坐标数据进行加密
 * @author giscafer
 * @version 1.0
 * @date    2016-06-04T01:48:33+0800
 * 参考：https://github.com/ecomfe/echarts/blob/8eeb7e5abe207d0536c62ce1f4ddecc6adfdf85e/src/util/mapData/rawData/encode.js
 */
!(function (name, definition) {
    var hasDefine = typeof define === 'funciton',
        hasExports = typeof module !== 'undefined' && module.exports;
    if (hasDefine) {
        //AMD/CMD
        define(difinition);
    } else if (hasExports) {
        //Node.js
        module.exports = definition();
    } else {
        this[name] = definition();
    }
})('Encoder', function () {
    function Encoder() { }

    Encoder.prototype.convert2Echarts = function (rawStr, fileName, type) {
        var results = "";
        var json = JSON.parse(rawStr);
        // Meta tag
        json.UTF8Encoding = true;
        var features = json.features;
        // console.log(json);
        if (features) {
            features.forEach(function (feature) {
                var encodeOffsets = feature.geometry.encodeOffsets = [];
                var coordinates = feature.geometry.coordinates;
                if (feature.geometry.type === 'Polygon') {
                    coordinates.forEach(function (coordinate, idx) {
                        coordinates[idx] = encodePolygon(
                            coordinate, encodeOffsets[idx] = []
                        );
                    });
                } else if (feature.geometry.type === 'MultiPolygon') {
                    coordinates.forEach(function (polygon, idx1) {
                        encodeOffsets[idx1] = [];
                        polygon.forEach(function (coordinate, idx2) {
                            coordinates[idx1][idx2] = encodePolygon(
                                coordinate, encodeOffsets[idx1][idx2] = []
                            );
                        });
                    });
                }
            });
        } else {
            var geometries = json.geometries;
            geometries.forEach(function (geometry) {
                var encodeOffsets = geometry.encodeOffsets = [];
                var coordinates = geometry.coordinates;
                if (geometry.type === 'Polygon') {
                    coordinates.forEach(function (coordinate, idx) {
                        coordinates[idx] = encodePolygon(
                            coordinate, encodeOffsets[idx] = []
                        );
                    });
                } else if (geometry.type === 'MultiPolygon') {
                    coordinates.forEach(function (polygon, idx1) {
                        encodeOffsets[idx1] = [];
                        polygon.forEach(function (coordinate, idx2) {
                            coordinates[idx1][idx2] = encodePolygon(
                                coordinate, encodeOffsets[idx1][idx2] = []
                            );
                        });
                    });
                }
            });
        }

        if (type === 'json') {
            results = JSON.stringify(json);
        } else {
            results = addEchartsJsWrapper(JSON.stringify(json), fileName);
        }
        return results;
    };
    function encodePolygon(coordinate, encodeOffsets) {
        var result = '';

        var prevX = quantize(coordinate[0][0]);
        var prevY = quantize(coordinate[0][1]);
        // Store the origin offset
        encodeOffsets[0] = prevX;
        encodeOffsets[1] = prevY;

        for (var i = 0; i < coordinate.length; i++) {
            var point = coordinate[i];
            result += encode(point[0], prevX);
            result += encode(point[1], prevY);

            prevX = quantize(point[0]);
            prevY = quantize(point[1]);
        }

        return result;
    }

    function addAMDWrapper(jsonStr) {
        return ['define(function() {',
            '    return ' + jsonStr + ';',
            '});'].join('\n');
    }

    function addEchartsJsWrapper(jsonStr, fileName) {
        return ['(function (root, factory) {',
            "   if (typeof define === 'function' && define.amd) {",
            "       define(['exports', 'echarts'], factory);",
            "   } else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {",
            "       factory(exports, require('echarts'));",
            "   } else {",
            "       factory({}, root.echarts);",
            "   }",
            " }(this, function (exports, echarts) {",
            "       var log = function (msg) {",
            "           if (typeof console !== 'undefined') {",
            "               console && console.error && console.error(msg);",
            "           }",
            "       }",
            " if (!echarts) {",
            "       log('ECharts is not Loaded');",
            "           return;",
            "       }",
            " if (!echarts.registerMap) {",
            "       log('ECharts Map is not loaded')",
            "       return;",
            " }",
            "  echarts.registerMap('" + fileName + "'," + jsonStr,
            '  )}));'].join('\n');
    }

    function encode(val, prev) {
        // Quantization
        val = quantize(val);
        // var tmp = val;
        // Delta
        val = val - prev;

        if (((val << 1) ^ (val >> 15)) + 64 === 8232) {
            //WTF, 8232 will get syntax error in js code
            val--;
        }
        // ZigZag
        val = (val << 1) ^ (val >> 15);
        // add offset and get unicode
        return String.fromCharCode(val + 64);
        // var tmp = {'tmp' : str};
        // try{
        //     eval("(" + JSON.stringify(tmp) + ")");
        // }catch(e) {
        //     console.log(val + 64);
        // }
    }

    function quantize(val) {
        return Math.ceil(val * 1024);
    }
    return new Encoder();
});



================================================
FILE: index.html
================================================
<!DOCTYPE html>
<html>
<head>
	<title>mapshaper plus</title>
	<meta name="Description" content="A tool for topologically aware shape simplification. Reads and writes Shapefile, GeoJSON and TopoJSON formats." />
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<link rel="stylesheet" href="page.css">
	<link rel="stylesheet" href="elements.css">
	<link rel="icon"
      type="image/png"
      href="images/icon.png">
</head>
<body class="theme2">
<div class="hidden">
	<svg version="1.1" id="home-icon" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px"
		 y="0px" width="14px" height="19px" viewBox="0 0 14 16">
	<g>
		<polygon points="13,7 13,6 12,6 12,5 11,5 11,4 10,4 10,3 9,3 9,2 8,2 8,1 6,1 6,2 5,2 5,3 4,3 4,4 3,4 3,5 2,5 
			2,6 1,6 1,7 0,7 0,9 2,9 2,14 6,14 6,10 8,10 8,14 12,14 12,9 14,9 14,7"/>
	</g>
	</svg>
	<svg version="1.1" id="zoom-in-icon" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px"
		 y="0px" width="14px" height="21px" viewBox="0 0 14 14">
	<g>
		<polygon points="13,5 9,5 9,1 5,1 5,5 1,5 1,9 5,9 5,13 9,13 9,9 13,9"/>
	</g>
	</svg>
	<svg version="1.1" id="zoom-out-icon" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px"
		 y="0px" width="14px" height="16px" viewBox="0 -1 14 10">
	<g>
		<polygon points="1,1 13,1 13,5 1,5 1,1" />
	</g>
	</svg>
<svg version="1.1" id="info-icon2"
	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="13px" height="18px"
	 viewBox="-510 390 13 18" xml:space="preserve">
<circle fill="#30D4EF" cx="-503.4" cy="392.8" r="2.7"/>
<rect x="-508" y="405" fill="#30D4EF" width="10" height="3"/>
<rect x="-507" y="398" fill="#30D4EF" width="6" height="3"/>
<rect x="-505" y="400" fill="#30D4EF" width="4" height="6"/>
</svg>

</div>

<div id="coordinate-info" class="colored-text selectable"></div>
<a href="https://github.com/giscafer/mapshaper-plus" target="_blank"><div id="fork-me"></div></a>
<div class="page-header">
	<div class="mapshaper-logo">map<span class="logo-highlight">shaper plus</span></div>

	<div id="layer-control-btn"><span class="btn header-btn layer-name"></span></div>

	<div id="simplify-control-wrapper"><div id="simplify-control"><div class="header-btn btn" id="simplify-settings-btn">Settings</div>
		<div class="slider">
			<div class="handle"><img src="images/slider_handle_v1.png" alt=""/></div>
			<div class="track"></div>
		</div>
		<input type="text" value="label" class="clicktext" />
	</div></div>
	<div id="mode-buttons">
		<span id="simplify-btn" class="header-btn btn">Simplify</span><span class="separator"></span><span id="console-btn" class="header-btn btn">Console</span><span class="separator"></span><span id="export-btn" class="header-btn btn">Export</span>
	</div>
</div>

<div id="mshp-not-supported" class="main-area">
	<div class="info-box">
	<h3>Unfortunately, mapshaper can't run in <span class="unsupported-browser">this web browser</span></h3>
	<div>For best results, try <a href="https://www.google.com/chrome/browser/desktop/">Google Chrome</a> or <a href="http://www.mozilla.org/en-US/firefox/new/">Mozilla Firefox</a>.</div>
	</div>
</div>

<div id="layer-control" class="main-area popup-dialog">
	<div class="info-box">
		<div id="layer-menu">
			<h3>Layers</h3>
			<div class="layer-list"></div>
			<div><div id="add-file-btn" class="dialog-btn btn">Add a file</div></div>
		</div>
	</div>
</div>

<div id="export-options" class="main-area popup-dialog">
	<div class="info-box">
		<h3>Export menu</h3>
		<div style="height:3px"></div>
		<div id="export-layers">
			<h4>Layers</h4>
			<div id="export-layer-list" class="option-menu"></div>
		</div>
		<h4>File format</h4>
		<div id="export-formats" class="option-menu">
		</div>

		<div class="option-menu"><input type="text" class="advanced-options" placeholder="command line options" /><div class="tip-button">?<div class="tip-anchor">
		<div class="tip">Enter options from the command line
interface. Examples: "bbox" "no-quantization"
"precision=0.001"</div></div></div></div>
		<div class="cancel-btn btn dialog-btn">Cancel</div>
		<div id="save-btn" class="btn dialog-btn">Export</div>
	</div>
</div>

<div id="simplify-options" class="main-area popup-dialog">
	<div class="info-box">
		<h3>Simplification menu</h3>
		<div class="option-menu">
			<div><label for="import-retain-opt"><input type="checkbox" class="checkbox" id="import-retain-opt"/>prevent shape removal</label>
							<div class="tip-button">?<div class="tip-anchor">
			<div class="tip">Prevent small polygon features from
disappearing at high simplification. Keeps
the largest ring of multi-ring features.
</div></div></div></div>
			<div id="planar-opt-wrapper"><label for="planar-opt"><input type="checkbox" class="checkbox" id="planar-opt"/>use planar geometry</label>
							<div class="tip-button">?<div class="tip-anchor">
			<div class="tip">Interpret x, y values as Cartesian coordinates
on a plane, rather than longitude, latitude
coordinates on a sphere.
</div></div></div></div>
		</div>

			<h4>Method</h4>
			<div class="option-menu">

			<div><label><input type="radio" name="method" value="dp" class="radio">Douglas-Peucker</label><div class="tip-button">?<div class="tip-anchor">
<div class="tip">Simplified lines remain within a set
distance of original lines. Good for
thinning dense points, but spikes
tend to form at high simplification.</div></div></div>
			</div>			

			<div><label><input type="radio" name="method" value="visvalingam" class="radio">Visvalingam / effective area</label><div class="tip-button">?<div class="tip-anchor">
<div class="tip">Lines are simplified by iteratively
removing the point that forms
the least-area triangle with two
adjacent points.</div></div></div>
			</div>

			<div><label><input type="radio" name="method" value="weighted_visvalingam" class="radio">Visvalingam / weighted area</label><div class="tip-button">?<div class="tip-anchor">
<div class="tip">Points located at the vertex
of more acute angles are
preferentially removed, for
a smoother appearance.</div></div></div></div>


		</div> <!-- option menu -->

		<div>
			<div class="cancel-btn btn dialog-btn">Cancel</div>
			<div class="submit-btn btn dialog-btn">Apply</div>
		</div>
	</div> <!-- .info-box -->
</div> <!-- #simplify-options -->

<div id="import-options" class="main-area popup-dialog">
	<div class="info-box">
		<div id="import-intro">
			<h3>Edit a file</h3>
<p>Drag and drop or  <span class="inline-btn btn" id="file-selection-btn"><span class="label-text">select</span></span> one or more files
to import. Shapefile, GeoJSON, TopoJSON
and Zip files are supported.
</p>
		</div>
		<h4>Import options</h4>
		<div class="option-menu">

			<div><label for="repair-intersections-opt"><input type="checkbox" checked class="checkbox" id="repair-intersections-opt"/>detect line intersections</label>
			<div class="tip-button">?<div class="tip-anchor">
<div class="tip">Detect line intersections, including
self-intersections, to help identify
topological errors in a dataset.</div></div></div></div>

			<div><label for="snap-points-opt"><input type="checkbox" class="checkbox" id="snap-points-opt" />snap vertices</label>
			<div class="tip-button">?<div class="tip-anchor">
<div class="tip">Fix topology errors by snapping
together points with nearly identical
coordinates. This option does not
apply to TopoJSON files.</div></div></div></div>
<div style="height:5px"></div>
<div><input type="text" class="advanced-options" placeholder="command line options" /><div class="tip-button">?<div class="tip-anchor">
<div class="tip">Enter options from the command line
interface. Examples: "no-topology"
"encoding=big5"</div></div></div></div>

		</div>

		<div id="dropped-file-list">
			<h3>Files</h3>
			<div class="file-list"></div>
		</div>

		<div id="import-buttons" class="hidden">
			<div class="cancel-btn btn dialog-btn">Cancel</div>
			<div class="add-btn btn dialog-btn">Add file</div>
			<div class="submit-btn btn dialog-btn">Import</div>
		</div>

	</div> <!-- .info-box -->
</div> <!-- import-options -->

<!-- TODO: remove #mshp-main-page without causing the map to jitter when resized -->
<div id="mshp-main-page">
	<div id="console" class="main-area">
		<div id="console-window"><div id="console-buffer" class="selectable"></div></div>
	</div>
	<div id="mshp-main-map" class="main-area">
		<div id="intersection-display">
			<div id="intersection-count">0 line intersections</div>
			<div id="repair-btn" class="text-btn colored-text">Repair</div>
		</div>
		<div id="map-layers"></div>
	</div>
</div>
<script src="encode.js" type="text/javascript"></script>
<script src="zip.js" type="text/javascript"></script>
<script src="mapshaper.js" type="text/javascript"></script>
<script src="manifest.js" type="text/javascript"></script>
<script src="mapshaper-gui.js" type="text/javascript"></script>
</body>
</html>

================================================
FILE: manifest.js
================================================
/* replaced by a file manifest by mapshaper-gui server */

================================================
FILE: mapshaper-gui.js
================================================
(function(){

var api = mapshaper; // assuming mapshaper is in global scope
var utils = api.utils;
var gui = api.gui = {};
var cli = api.cli;
var geom = api.geom;
var MapShaper = api.internal;
var Bounds = api.internal.Bounds;
var APIError = api.internal.APIError;
var message = api.internal.message;

// Replace error function in mapshaper lib
var error = MapShaper.error = function() {
  stop.apply(null, utils.toArray(arguments));
};

// replace stop function
var stop = MapShaper.stop = function() {
  // Show a popup error message, then throw an error
  var msg = gui.formatMessageArgs(arguments);
  gui.alert(msg);
  throw new Error(msg);
};


function Handler(type, target, callback, listener, priority) {
  this.type = type;
  this.callback = callback;
  this.listener = listener || null;
  this.priority = priority || 0;
  this.target = target;
}

Handler.prototype.trigger = function(evt) {
  if (!evt) {
    evt = new EventData(this.type);
    evt.target = this.target;
  } else if (evt.target != this.target || evt.type != this.type) {
    error("[Handler] event target/type have changed.");
  }
  this.callback.call(this.listener, evt);
}

function EventData(type, target, data) {
  this.type = type;
  this.target = target;
  if (data) {
    utils.defaults(this, data);
    this.data = data;
  }
}

EventData.prototype.stopPropagation = function() {
  this.__stop__ = true;
};

//  Base class for objects that dispatch events
function EventDispatcher() {}


// @obj (optional) data object, gets mixed into event
// @listener (optional) dispatch event only to this object
EventDispatcher.prototype.dispatchEvent = function(type, obj, listener) {
  var evt;
  // TODO: check for bugs if handlers are removed elsewhere while firing
  var handlers = this._handlers;
  if (handlers) {
    for (var i = 0, len = handlers.length; i < len; i++) {
      var handler = handlers[i];
      if (handler.type == type && (!listener || listener == handler.listener)) {
        if (!evt) {
          evt = new EventData(type, this, obj);
        }
        else if (evt.__stop__) {
            break;
        }
        handler.trigger(evt);
      }
    }
  }
};

EventDispatcher.prototype.addEventListener =
EventDispatcher.prototype.on = function(type, callback, context, priority) {
  context = context || this;
  priority = priority || 0;
  var handler = new Handler(type, this, callback, context, priority);
  // Insert the new event in the array of handlers according to its priority.
  var handlers = this._handlers || (this._handlers = []);
  var i = handlers.length;
  while (--i >= 0 && handlers[i].priority < handler.priority) {}
  handlers.splice(i+1, 0, handler);
  return this;
};

// Remove an event handler.
// @param {string} type Event type to match.
// @param {function(BoundEvent)} callback Event handler function to match.
// @param {*=} context Execution context of the event handler to match.
// @return {number} Returns number of handlers removed (expect 0 or 1).
EventDispatcher.prototype.removeEventListener = function(type, callback, context) {
  context = context || this;
  var count = this.removeEventListeners(type, callback, context);
  return count;
};

// Remove event handlers; passing arguments can limit which listeners to remove
// Returns nmber of handlers removed.
EventDispatcher.prototype.removeEventListeners = function(type, callback, context) {
  var handlers = this._handlers;
  var newArr = [];
  var count = 0;
  for (var i = 0; handlers && i < handlers.length; i++) {
    var evt = handlers[i];
    if ((!type || type == evt.type) &&
      (!callback || callback == evt.callback) &&
      (!context || context == evt.listener)) {
      count += 1;
    }
    else {
      newArr.push(evt);
    }
  }
  this._handlers = newArr;
  return count;
};

EventDispatcher.prototype.countEventListeners = function(type) {
  var handlers = this._handlers,
    len = handlers && handlers.length || 0,
    count = 0;
  if (!type) return len;
  for (var i = 0; i < len; i++) {
    if (handlers[i].type === type) count++;
  }
  return count;
};



var Env = (function() {
  var inNode = typeof module !== 'undefined' && !!module.exports;
  var inBrowser = typeof window !== 'undefined' && !inNode;
  var inPhantom = inBrowser && !!(window.phantom && window.phantom.exit);
  var ieVersion = inBrowser && /MSIE ([0-9]+)/.exec(navigator.appVersion) && parseInt(RegExp.$1) || NaN;

  return {
    iPhone : inBrowser && !!(navigator.userAgent.match(/iPhone/i)),
    iPad : inBrowser && !!(navigator.userAgent.match(/iPad/i)),
    canvas: inBrowser && !!document.createElement('canvas').getContext,
    inNode : inNode,
    inPhantom : inPhantom,
    inBrowser: inBrowser,
    ieVersion: ieVersion,
    ie: !isNaN(ieVersion)
  };
})();


var Browser = {
  getPageXY: function(el) {
    var x = 0, y = 0;
    if (el.getBoundingClientRect) {
      var box = el.getBoundingClientRect();
      x = box.left - Browser.pageXToViewportX(0);
      y = box.top - Browser.pageYToViewportY(0);
    }
    else {
      var fixed = Browser.elementIsFixed(el);

      while (el) {
        x += el.offsetLeft || 0;
        y += el.offsetTop || 0;
        el = el.offsetParent;
      }

      if (fixed) {
        var offsX = -Browser.pageXToViewportX(0);
        var offsY = -Browser.pageYToViewportY(0);
        x += offsX;
        y += offsY;
      }
    }

    var obj = {x:x, y:y};
    return obj;
  },

  elementIsFixed: function(el) {
    // get top-level offsetParent that isn't body (cf. Firefox)
    var body = document.body;
    while (el && el != body) {
      var parent = el;
      el = el.offsetParent;
    }

    // Look for position:fixed in the computed style of the top offsetParent.
    // var styleObj = parent && (parent.currentStyle || window.getComputedStyle && window.getComputedStyle(parent, '')) || {};
    var styleObj = parent && Browser.getElementStyle(parent) || {};
    return styleObj['position'] == 'fixed';
  },

  pageXToViewportX: function(x) {
    return x - window.pageXOffset;
  },

  pageYToViewportY: function(y) {
    return y - window.pageYOffset;
  },

  getElementStyle: function(el) {
    return el.currentStyle || window.getComputedStyle && window.getComputedStyle(el, '') || {};
  },

  getClassNameRxp: function(cname) {
    return new RegExp("(^|\\s)" + cname + "(\\s|$)");
  },

  hasClass: function(el, cname) {
    var rxp = this.getClassNameRxp(cname);
    return el && rxp.test(el.className);
  },

  addClass: function(el, cname) {
    var classes = el.className;
    if (!classes) {
      classes = cname;
    }
    else if (!this.hasClass(el, cname)) {
      classes = classes + ' ' + cname;
    }
    el.className = classes;
  },

  removeClass: function(el, cname) {
    var rxp = this.getClassNameRxp(cname);
    el.className = el.className.replace(rxp, "$2");
  },

  replaceClass: function(el, c1, c2) {
    var r1 = this.getClassNameRxp(c1);
    el.className = el.className.replace(r1, '$1' + c2 + '$2');
  },

  mergeCSS: function(s1, s2) {
    var div = this._cssdiv;
    if (!div) {
      div = this._cssdiv = document.createElement('div');
    }
    div.style.cssText = s1 + ";" + s2; // extra ';' for ie, which may leave off final ';'
    return div.style.cssText;
  },

  addCSS: function(el, css) {
    el.style.cssText = Browser.mergeCSS(el.style.cssText, css);
  },

  // Return: HTML node reference or null
  // Receive: node reference or id or "#" + id
  getElement: function(ref) {
    var el;
    if (typeof ref == 'string') {
      if (ref.charAt(0) == '#') {
        ref = ref.substr(1);
      }
      if (ref == 'body') {
        el = document.getElementsByTagName('body')[0];
      }
      else {
        el = document.getElementById(ref);
      }
    }
    else if (ref && ref.nodeType !== void 0) {
      el = ref;
    }
    return el || null;
  },

  undraggable: function(el) {
    el.ondragstart = function(){return false;};
    el.draggable = false;
  }

};

Browser.onload = function(handler) {
  if (document.readyState == 'complete') {
    handler();
  } else {
    window.addEventListener('load', handler);
  }
};


// See https://github.com/janl/mustache.js/blob/master/mustache.js
utils.htmlEscape = (function() {
  var entityMap = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;',
    '/': '&#x2F;'
  };
  return function(s) {
    return String(s).replace(/[&<>"'\/]/g, function(s) {
      return entityMap[s];
    });
  };
}());


var classSelectorRE = /^\.([\w-]+)$/,
    idSelectorRE = /^#([\w-]+)$/,
    tagSelectorRE = /^[\w-]+$/,
    tagOrIdSelectorRE = /^#?[\w-]+$/;

function Elements(sel) {
  if ((this instanceof Elements) == false) {
    return new Elements(sel);
  }
  this.elements = [];
  this.select(sel);
  this.tmp = new El();
}

Elements.prototype = {
  size: function() {
    return this.elements.length;
  },

  select: function(sel) {
    this.elements = Elements.__select(sel);
    return this;
  },

  addClass: function(className) {
    this.forEach(function(el) { el.addClass(className); });
    return this;
  },

  removeClass: function(className) {
    this.forEach(function(el) { el.removeClass(className); })
    return this;
  },

  forEach: function(callback, ctx) {
    var tmp = this.tmp;
    for (var i=0, len=this.elements.length; i<len; i++) {
      tmp.el = this.elements[i];
      callback.call(ctx, tmp, i);
    }
    return this;
  }
};

Elements.__select = function(selector, root) {
  root = root || document;
  var els;
  if (classSelectorRE.test(selector)) {
    els = Elements.__getElementsByClassName(RegExp.$1, root);
  }
  else if (tagSelectorRE.test(selector)) {
    els = root.getElementsByTagName(selector);
  }
  else if (document.querySelectorAll) {
    try {
      els = root.querySelectorAll(selector)
    } catch (e) {
      error("Invalid selector:", selector);
    }
  } else {
    error("This browser doesn't support CSS query selectors");
  }
  return utils.toArray(els);
}

Elements.__getElementsByClassName = function(cname, node) {
  if (node.getElementsByClassName) {
    return node.getElementsByClassName(cname);
  }
  var a = [];
  var re = new RegExp('(^| )'+cname+'( |$)');
  var els = node.getElementsByTagName("*");
  for (var i=0, j=els.length; i<j; i++)
    if (re.test(els[i].className)) a.push(els[i]);
  return a;
};

// Converts dash-separated names (e.g. background-color) to camelCase (e.g. backgroundColor)
// Doesn't change names that are already camelCase
//
El.toCamelCase = function(str) {
  var cc = str.replace(/-([a-z])/g, function (g) { return g[1].toUpperCase() });
  return cc;
};

El.fromCamelCase = function(str) {
  var dashed = str.replace(/([A-Z])/g, "-$1").toLowerCase();
  return dashed;
};

El.setStyle = function(el, name, val) {
  var jsName = El.toCamelCase(name);
  if (el.style[jsName] == void 0) {
    trace("[Element.setStyle()] css property:", jsName);
    return;
  }
  var cssVal = val;
  if (isFinite(val)) {
    cssVal = String(val); // problem if converted to scientific notation
    if (jsName != 'opacity' && jsName != 'zIndex') {
      cssVal += "px";
    }
  }
  el.style[jsName] = cssVal;
}

El.findAll = function(sel, root) {
  return Elements.__select(sel, root);
};

function El(ref) {
  if (!ref) error("Element() needs a reference");
  if (ref instanceof El) {
    return ref;
  }
  else if (this instanceof El === false) {
    return new El(ref);
  }

  var node;
  if (utils.isString(ref)) {
    if (El.isHTML(ref)) {
      var parent = El('div').html(ref).node();
      node = parent.childNodes.length  == 1 ? parent.childNodes[0] : parent;
    } else if (tagOrIdSelectorRE.test(ref)) {
      node = Browser.getElement(ref) || document.createElement(ref); // TODO: detect type of argument
    } else {
      node = Elements.__select(ref)[0];
    }
  } else if (ref.tagName) {
    node = ref;
  }
  if (!node) error("Unmatched element selector:", ref);
  this.el = node;
}

utils.inherit(El, EventDispatcher); //

El.removeAll = function(sel) {
  var arr = Elements.__select(sel);
  utils.forEach(arr, function(el) {
    El(el).remove();
  });
};

El.isHTML = function(str) {
  return str && str[0] == '<'; // TODO: improve
};

utils.extend(El.prototype, {

  clone: function() {
    var el = this.el.cloneNode(true);
    if (el.nodeName == 'SCRIPT') {
      // Assume scripts are templates and convert to divs, so children
      //    can
      el = El('div').addClass(el.className).html(el.innerHTML).node();
    }
    el.id = utils.getUniqueName();
    this.el = el;
    return this;
  },

  node: function() {
    return this.el;
  },

  width: function() {
   return this.el.offsetWidth;
  },

  height: function() {
    return this.el.offsetHeight;
  },

  top: function() {
    return this.el.offsetTop;
  },

  left: function() {
    return this.el.offsetLeft;
  },

  // Apply inline css styles to this Element, either as string or object.
  //
  css: function(css, val) {
    if (val != null) {
      El.setStyle(this.el, css, val);
    }
    else if (utils.isString(css)) {
      Browser.addCSS(this.el, css);
    }
    else if (utils.isObject(css)) {
      utils.forEachProperty(css, function(val, key) {
        El.setStyle(this.el, key, val);
      }, this);
    }
    return this;
  },

  attr: function(obj, value) {
    if (utils.isString(obj)) {
      if (arguments.length == 1) {
        return this.el.getAttribute(obj);
      }
      this.el[obj] = value;
    }
    else if (!value) {
      Opts.copyAllParams(this.el, obj);
    }
    return this;
  },


  remove: function(sel) {
    this.el.parentNode && this.el.parentNode.removeChild(this.el);
    return this;
  },

  addClass: function(className) {
    Browser.addClass(this.el, className);
    return this;
  },

  removeClass: function(className) {
    Browser.removeClass(this.el, className);
    return this;
  },

  classed: function(className, b) {
    this[b ? 'addClass' : 'removeClass'](className);
    return this;
  },

  hasClass: function(className) {
    return Browser.hasClass(this.el, className);
  },

  toggleClass: function(cname) {
    if (this.hasClass(cname)) {
      this.removeClass(cname);
    } else {
      this.addClass(cname);
    }
  },

  computedStyle: function() {
    return Browser.getElementStyle(this.el);
  },

  visible: function() {
    if (this._hidden !== undefined) {
      return !this._hidden;
    }
    var style = this.computedStyle();
    return style.display != 'none' && style.visibility != 'hidden';
  },

  showCSS: function(css) {
    if (!css) {
      return this._showCSS || "display:block;";
    }
    this._showCSS = css;
    return this;
  },

  hideCSS: function(css) {
    if (!css) {
      return this._hideCSS || "display:none;";
    }
    this._hideCSS = css;
    return this;
  },

  hide: function(css) {
    if (this.visible()) {
      this.css(css || this.hideCSS());
      this._hidden = true;
    }
    return this;
  },

  show: function(css) {
    if (!this.visible()) {
      this.css(css || this.showCSS());
      this._hidden = false;
    }
    return this;
  },

  html: function(html) {
    if (arguments.length == 0) {
      return this.el.innerHTML;
    } else {
      this.el.innerHTML = html;
      return this;
    }
  },

  text: function(str) {
    this.html(utils.htmlEscape(str));
    return this;
  },

  // Shorthand for attr('id', <name>)
  id: function(id) {
    if (id) {
      this.el.id = id;
      return this;
    }
    return this.el.id;
  },

  findChild: function(sel) {
    var node = Elements.__select(sel, this.el)[0];
    if (!node) error("Unmatched selector:", sel);
    return new El(node);
  },

  appendTo: function(ref) {
    var parent = ref instanceof El ? ref.el : Browser.getElement(ref);
    if (this._sibs) {
      for (var i=0, len=this._sibs.length; i<len; i++) {
        parent.appendChild(this._sibs[i]);
      }
    }
    parent.appendChild(this.el);
    return this;
  },

  nextSibling: function() {
    return this.el.nextSibling ? new El(this.el.nextSibling) : null;
  },

  newSibling: function(tagName) {
    var el = this.el,
        sib = document.createElement(tagName),
        e = new El(sib),
        par = el.parentNode;
    if (par) {
      el.nextSibling ? par.insertBefore(sib, el.nextSibling) : par.appendChild(sib);
    } else {
      e._sibs = this._sibs || [];
      e._sibs.push(el);
    }
    return e;
  },

  firstChild: function() {
    var ch = this.el.firstChild;
    while (ch.nodeType != 1) { // skip text nodes
      ch = ch.nextSibling;
    }
    return new El(ch);
  },

  appendChild: function(ref) {
    var el = El(ref);
    this.el.appendChild(el.el);
    return this;
  },

  newChild: function(tagName) {
    var ch = document.createElement(tagName);
    this.el.appendChild(ch);
    return new El(ch);
  },

  // Traverse to parent node
  parent: function() {
    var p = this.el && this.el.parentNode;
    return p ? new El(p) : null;
  },

  findParent: function(tagName) {
    var p = this.el && this.el.parentNode;
    if (tagName) {
      tagName = tagName.toUpperCase();
      while (p && p.tagName != tagName) {
        p = p.parentNode;
      }
    }
    return p ? new El(p) : null;
  },

  // Remove all children of this element
  //
  empty: function() {
    this.el.innerHTML = '';
    return this;
  }

});

// use DOM handler for certain events
// TODO: find a better way distinguising DOM events and other events registered on El
// e.g. different methods
//
//El.prototype.__domevents = utils.arrayToIndex("click,mousedown,mousemove,mouseup".split(','));
El.prototype.__on = El.prototype.on;
El.prototype.on = function(type, func, ctx) {
  if (ctx) {
    error("[El#on()] Third argument no longer supported.");
  }
  if (this.constructor == El) {
    this.el.addEventListener(type, func);
  } else {
    this.__on.apply(this, arguments);
  }
  return this;
};

El.prototype.__removeEventListener = El.prototype.removeEventListener;
El.prototype.removeEventListener = function(type, func) {
  if (this.constructor == El) {
    this.el.removeEventListener(type, func);
  } else {
    this.__removeEventListener.apply(this, arguments);
  }
  return this;
};


function ElementPosition(ref) {
  var self = this,
      el = El(ref),
      pageX = 0,
      pageY = 0,
      width = 0,
      height = 0;

  el.on('mouseover', update);
  window.onorientationchange && window.addEventListener('orientationchange', update);
  window.addEventListener('scroll', update);
  window.addEventListener('resize', update);

  // trigger an update, e.g. when map container is resized
  this.update = function() {
    update();
  };

  this.resize = function(w, h) {
    el.css('width', w).css('height', h);
    update();
  };

  this.width = function() { return width };
  this.height = function() { return height };
  this.position = function() {
    return {
      element: el.node(),
      pageX: pageX,
      pageY: pageY,
      width: width,
      height: height
    };
  };

  function update() {
    var div = el.node(),
        xy = Browser.getPageXY(div),
        w = div.clientWidth,
        h = div.clientHeight,
        x = xy.x,
        y = xy.y,
        resized = w != width || h != height,
        moved = x != pageX || y != pageY;
    if (resized || moved) {
      pageX = x, pageY = y, width = w, height = h;
      self.dispatchEvent('change', self.position());
      if (resized) {
        self.dispatchEvent('resize', self.position());
      }
    }
  }
  update();
}

utils.inherit(ElementPosition, EventDispatcher);


function getTimerFunction() {
  return typeof requestAnimationFrame == 'function' ?
    requestAnimationFrame : function(cb) {setTimeout(cb, 25);};
}

function Timer() {
  var self = this,
      running = false,
      busy = false,
      tickTime, startTime, duration;

  this.start = function(ms) {
    var now = +new Date();
    duration = ms || Infinity;
    startTime = now;
    running = true;
    if (!busy) startTick(now);
  };

  this.stop = function() {
    running = false;
  };

  function startTick(now) {
    busy = true;
    tickTime = now;
    getTimerFunction()(onTick);
  }

  function onTick() {
    var now = +new Date(),
        elapsed = now - startTime,
        pct = Math.min((elapsed + 10) / duration, 1),
        done = pct >= 1;
    if (!running) { // interrupted
      busy = false;
      return;
    }
    if (done) running = false;
    self.dispatchEvent('tick', {
      elapsed: elapsed,
      pct: pct,
      done: done,
      time: now,
      tickTime: now - tickTime
    });
    busy = false;
    if (running) startTick(now);
  }
}

utils.inherit(Timer, EventDispatcher);

function Tween(ease) {
  var self = this,
      timer = new Timer(),
      start, end;

  timer.on('tick', onTick);

  this.start = function(a, b, duration) {
    start = a;
    end = b;
    timer.start(duration || 500);
  };

  function onTick(e) {
    var pct = ease ? ease(e.pct) : e.pct,
        val = end * pct + start * (1 - pct);
    self.dispatchEvent('change', {value: val});
  }
}

utils.inherit(Tween, EventDispatcher);

Tween.sineInOut = function(n) {
  return 0.5 - Math.cos(n * Math.PI) / 2;
};

Tween.quadraticOut = function(n) {
  return 1 - Math.pow((1 - n), 2);
};


// @mouse: MouseArea object
function MouseWheel(mouse) {
  var self = this,
      prevWheelTime = 0,
      currDirection = 0,
      timer = new Timer().addEventListener('tick', onTick),
      sustainTime = 60,
      fadeTime = 80;

  if (window.onmousewheel !== undefined) { // ie, webkit
    window.addEventListener('mousewheel', handleWheel);
  } else { // firefox
    window.addEventListener('DOMMouseScroll', handleWheel);
  }

  function handleWheel(evt) {
    var direction;
    if (evt.wheelDelta) {
      direction = evt.wheelDelta > 0 ? 1 : -1;
    } else if (evt.detail) {
      direction = evt.detail > 0 ? -1 : 1;
    }
    if (!mouse.isOver() || !direction) return;
    evt.preventDefault();
    prevWheelTime = +new Date();
    if (!currDirection) {
      self.dispatchEvent('mousewheelstart');
    }
    currDirection = direction;
    timer.start(sustainTime + fadeTime);
  }

  function onTick(evt) {
    var elapsed = evt.time - prevWheelTime,
        fadeElapsed = elapsed - sustainTime,
        scale = evt.tickTime / 25,
        obj;
    if (evt.done) {
      currDirection = 0;
    } else {
      if (fadeElapsed > 0) {
        // Decelerate if the timer fires during 'fade time' (for smoother zooming)
        scale *= Tween.quadraticOut((fadeTime - fadeElapsed) / fadeTime);
      }
      obj = utils.extend({direction: currDirection, multiplier: scale}, mouse.mouseData());
      self.dispatchEvent('mousewheel', obj);
    }
  }
}

utils.inherit(MouseWheel, EventDispatcher);


function MouseArea(element) {
  var pos = new ElementPosition(element),
      _areaPos = pos.position(),
      _self = this,
      _dragging = false,
      _isOver = false,
      _prevEvt,
      // _moveEvt,
      _downEvt;

  pos.on('change', function() {_areaPos = pos.position()});
  // TODO: think about touch events
  document.addEventListener('mousemove', onMouseMove);
  document.addEventListener('mousedown', onMouseDown);
  document.addEventListener('mouseup', onMouseUp);
  element.addEventListener('mouseover', onAreaEnter);
  element.addEventListener('mousemove', onAreaEnter);
  element.addEventListener('mouseout', onAreaOut);
  element.addEventListener('mousedown', onAreaDown);
  element.addEventListener('dblclick', onAreaDblClick);

  function onAreaDown(e) {
    e.preventDefault(); // prevent text selection cursor on drag
  }

  function onAreaEnter() {
    if (!_isOver) {
      _isOver = true;
      _self.dispatchEvent('enter');
    }
  }

  function onAreaOut(e) {
    _isOver = false;
    _self.dispatchEvent('leave');
  }

  function onMouseUp(e) {
    var evt = procMouseEvent(e),
        elapsed, dx, dy;
    if (_dragging) {
      _dragging = false;
      _self.dispatchEvent('dragend', evt);
    }
    if (_downEvt) {
      elapsed = evt.time - _downEvt.time;
      dx = evt.pageX - _downEvt.pageX;
      dy = evt.pageY - _downEvt.pageY;
      if (_isOver && elapsed < 500 && Math.sqrt(dx * dx + dy * dy) < 6) {
        _self.dispatchEvent('click', evt);
      }
      _downEvt = null;
    }
  }

  function onMouseDown(e) {
   if (e.button != 2 && e.which != 3) { // ignore right-click
      _downEvt = procMouseEvent(e);
    }
  }

  function onMouseMove(e) {
    var evt = procMouseEvent(e);
    if (!_dragging && _downEvt && _downEvt.hover) {
      _dragging = true;
      _self.dispatchEvent('dragstart', evt);
    }

    if (_dragging) {
      var obj = {
        dragX: evt.pageX - _downEvt.pageX,
        dragY: evt.pageY - _downEvt.pageY
      };
      _self.dispatchEvent('drag', utils.extend(obj, evt));
    } else {
      _self.dispatchEvent('hover', evt);
    }
  }

  function onAreaDblClick(e) {
    if (_isOver) _self.dispatchEvent('dblclick', procMouseEvent(e));
  }

  function procMouseEvent(e) {
    var pageX = e.pageX,
        pageY = e.pageY,
        prev = _prevEvt;
    _prevEvt = {
      shiftKey: e.shiftKey,
      time: +new Date,
      pageX: pageX,
      pageY: pageY,
      hover: _isOver,
      x: pageX - _areaPos.pageX,
      y: pageY - _areaPos.pageY,
      dx: prev ? pageX - prev.pageX : 0,
      dy: prev ? pageY - prev.pageY : 0
    };
    return _prevEvt;
  }

  this.isOver = function() {
    return _isOver;
  }

  this.isDown = function() {
    return !!_downEvt;
  }

  this.mouseData = function() {
    return utils.extend({}, _prevEvt);
  }
}

utils.inherit(MouseArea, EventDispatcher);




function ErrorMessages(model) {
  var el;
  model.addMode('alert', function() {}, turnOff);

  function turnOff() {
    if (el) {
      el.remove();
      el = null;
    }
  }

  return function(str) {
    var infoBox;
    if (el) return;
    el = El('div').appendTo('body').addClass('error-wrapper');
    infoBox = El('div').appendTo(el).addClass('error-box info-box');
    El('p').addClass('error-message').appendTo(infoBox).html(str);
    El('div').addClass("btn dialog-btn").appendTo(infoBox).html('close').on('click', model.clearMode);
    model.enterMode('alert');
  };
}




api.enableLogging();

gui.browserIsSupported = function() {
  return typeof ArrayBuffer != 'undefined' &&
      typeof Blob != 'undefined' && typeof File != 'undefined';
};

gui.formatMessageArgs = function(args) {
  // remove cli annotation (if present)
  return MapShaper.formatLogArgs(args).replace(/^\[[^\]]+\] ?/, '');
};

gui.handleDirectEvent = function(cb) {
  return function(e) {
    if (e.target == this) cb();
  };
};

gui.getInputElement = function() {
  var el = document.activeElement;
  return (el && (el.tagName == 'INPUT' || el.contentEditable == 'true')) ? el : null;
};

gui.selectElement = function(el) {
  var range = document.createRange(),
      sel = getSelection();
  range.selectNodeContents(el);
  sel.removeAllRanges();
  sel.addRange(range);
};

gui.blurActiveElement = function() {
  var el = gui.getInputElement();
  if (el) el.blur();
};

// Filter out delayed click events, e.g. so users can highlight and copy text
gui.onClick = function(el, cb) {
  var time;
  el.on('mousedown', function() {
    time = +new Date();
  });
  el.on('mouseup', function(e) {
    if (+new Date() - time < 300) cb(e);
  });
};




// TODO: switch all ClickText to ClickText2

// @ref Reference to an element containing a text node
function ClickText2(ref) {
  var self = this;
  var selected = false;
  var el = El(ref).on('mousedown', init);

  function init() {
    el.removeEventListener('mousedown', init);
    el.attr('contentEditable', true)
    .attr('spellcheck', false)
    .attr('autocorrect', false)
    .on('focus', function(e) {
      el.addClass('editing');
      selected = false;
    }).on('blur', function(e) {
      el.removeClass('editing');
      self.dispatchEvent('change');
      getSelection().removeAllRanges();
    }).on('keydown', function(e) {
      if (e.keyCode == 13) { // enter
        e.stopPropagation();
        e.preventDefault();
        this.blur();
      }
    }).on('click', function(e) {
      if (!selected && getSelection().isCollapsed) {
        gui.selectElement(el.node());
      }
      selected = true;
      e.stopPropagation();
    });
  }

  this.value = function(str) {
    if (utils.isString(str)) {
      el.node().textContent = str;
    } else {
      return el.node().textContent;
    }
  };
}

utils.inherit(ClickText2, EventDispatcher);

// @ref reference to a text input element
function ClickText(ref) {
  var _el = El(ref);
  var _self = this;
  var _max = Infinity,
      _min = -Infinity,
      _formatter = function(v) {return String(v);},
      _validator = function(v) {return !isNaN(v);},
      _parser = function(s) {return parseFloat(s);},
      _value = 0;

  _el.on('blur', onblur);
  _el.on('keydown', onpress);

  function onpress(e) {
    if (e.keyCode == 27) { // esc
      _self.value(_value); // reset input field to current value
      _el.el.blur();
    } else if (e.keyCode == 13) { // enter
      _el.el.blur();
    }
  }

  // Validate input contents.
  // Update internal value and fire 'change' if valid
  //
  function onblur() {
    var val = _parser(_el.el.value);
    if (val === _value) {
      // return;
    }
    if (_validator(val)) {
      _self.value(val);
      _self.dispatchEvent('change', {value:_self.value()});
    } else {
      _self.value(_value);
      _self.dispatchEvent('error'); // TODO: improve
    }
  }

  this.bounds = function(min, max) {
    _min = min;
    _max = max;
    return this;
  };

  this.validator = function(f) {
    _validator = f;
    return this;
  };

  this.formatter = function(f) {
    _formatter = f;
    return this;
  };

  this.parser = function(f) {
    _parser = f;
    return this;
  };

  this.value = function(arg) {
    if (arg == void 0) {
      // var valStr = this.el.value;
      // return _parser ? _parser(valStr) : parseFloat(valStr);
      return _value;
    }
    var val = utils.clamp(arg, _min, _max);
    if (!_validator(val)) {
      error("ClickText#value() invalid value:", arg);
    } else {
      _value = val;
    }
    _el.el.value = _formatter(val);
    return this;
  };
}

utils.inherit(ClickText, EventDispatcher);


function Checkbox(ref) {
  var _el = El(ref);
}

utils.inherit(Checkbox, EventDispatcher);

function SimpleButton(ref) {
  var _el = El(ref),
      _self = this,
      _active = !_el.hasClass('disabled');

  _el.on('click', function(e) {
    if (_active) _self.dispatchEvent('click');
    return false;
  });

  this.active = function(a) {
    if (a === void 0) return _active;
    if (a !== _active) {
      _active = a;
      _el.toggleClass('disabled');
    }
    return this;
  };
}

utils.inherit(SimpleButton, EventDispatcher);




function ModeButton(el, name, model) {
  var btn = El(el),
      active = false;
  model.on('mode', function(e) {
    active = e.name == name;
    if (active) {
      btn.addClass('active');
    } else {
      btn.removeClass('active');
    }
  });

  btn.on('click', function() {
    model.enterMode(active ? null : name);
  });
}




function draggable(ref) {
  var xdown, ydown;
  var el = El(ref),
      dragging = false,
      obj = new EventDispatcher();
  Browser.undraggable(el.node());
  el.on('mousedown', function(e) {
    xdown = e.pageX;
    ydown = e.pageY;
    window.addEventListener('mousemove', onmove);
    window.addEventListener('mouseup', onrelease);
  });

  function onrelease(e) {
    window.removeEventListener('mousemove', onmove);
    window.removeEventListener('mouseup', onrelease);
    if (dragging) {
      dragging = false;
      obj.dispatchEvent('dragend');
    }
  }

  function onmove(e) {
    if (!dragging) {
      dragging = true;
      obj.dispatchEvent('dragstart');
    }
    obj.dispatchEvent('drag', {dx: e.pageX - xdown, dy: e.pageY - ydown});
  }
  return obj;
}

function Slider(ref, opts) {
  var _el = El(ref);
  var _self = this;
  var defaults = {
    space: 7
  };
  opts = utils.extend(defaults, opts);

  var _pct = 0;
  var _track,
      _handle,
      _handleLeft = opts.space;

  function size() {
    return _track ? _track.width() - opts.space * 2 : 0;
  }

  this.track = function(ref) {
    if (ref && !_track) {
      _track = El(ref);
      _handleLeft = _track.el.offsetLeft + opts.space;
      updateHandlePos();
    }
    return _track;
  };

  this.handle = function(ref) {
    var startX;
    if (ref && !_handle) {
      _handle = El(ref);
      draggable(_handle)
        .on('drag', function(e) {
          setHandlePos(startX + e.dx, true);
        })
        .on('dragstart', function(e) {
          startX = position();
          _self.dispatchEvent('start');
        })
        .on('dragend', function(e) {
          _self.dispatchEvent('end');
        });
      updateHandlePos();
    }
    return _handle;
  };

  function position() {
    return Math.round(_pct * size());
  }

  this.pct = function(pct) {
    if (pct >= 0 && pct <= 1) {
      _pct = pct;
      updateHandlePos();
    }
    return _pct;
  };

  function setHandlePos(x, fire) {
    x = utils.clamp(x, 0, size());
    var pct = x / size();
    if (pct != _pct) {
      _pct = pct;
      _handle.css('left', _handleLeft + x);
      _self.dispatchEvent('change', {pct: _pct});
    }
  }

  function updateHandlePos() {
    var x = _handleLeft + Math.round(position());
    if (_handle) _handle.css('left', x);
  }
}

utils.inherit(Slider, EventDispatcher);



var SimplifyControl = function(model) {
  var control = new EventDispatcher();
  var _value = 1;
  var el = El('#simplify-control-wrapper');
  var menu = El('#simplify-options');
  var slider, text;

  new SimpleButton('#simplify-options .submit-btn').on('click', onSubmit);
  new SimpleButton('#simplify-options .cancel-btn').on('click', function() {
    if (el.visible()) {
      // cancel just hides menu if slider is visible
      menu.hide();
    } else {
      model.clearMode();
    }
  });
  new SimpleButton('#simplify-settings-btn').on('click', function() {
    if (menu.visible()) {
      menu.hide();
    } else {
      initMenu();
    }
  });

  new ModeButton('#simplify-btn', 'simplify', model);
  model.addMode('simplify', turnOn, turnOff);
  model.on('select', function() {
    if (model.getMode() == 'simplify') model.clearMode();
  });

  // exit simplify mode when user clicks off the visible part of the menu
  menu.on('click', gui.handleDirectEvent(model.clearMode));

  slider = new Slider("#simplify-control .slider");
  slider.handle("#simplify-control .handle");
  slider.track("#simplify-control .track");
  slider.on('change', function(e) {
    var pct = fromSliderPct(e.pct);
    text.value(pct);
    onchange(pct);
  });
  slider.on('start', function(e) {
    control.dispatchEvent('simplify-start');
  }).on('end', function(e) {
    control.dispatchEvent('simplify-end');
  });

  text = new ClickText("#simplify-control .clicktext");
  text.bounds(0, 1);
  text.formatter(function(val) {
    if (isNaN(val)) return '-';
    var pct = val * 100;
    var decimals = 0;
    if (pct <= 0) decimals = 1;
    else if (pct < 0.001) decimals = 4;
    else if (pct < 0.01) decimals = 3;
    else if (pct < 1) decimals = 2;
    else if (pct < 100) decimals = 1;
    return utils.formatNumber(pct, decimals) + "%";
  });

  text.parser(function(s) {
    return parseFloat(s) / 100;
  });

  text.value(0);
  text.on('change', function(e) {
    var pct = e.value;
    slider.pct(toSliderPct(pct));
    control.dispatchEvent('simplify-start');
    onchange(pct);
    control.dispatchEvent('simplify-end');
  });

  function turnOn() {
    var target = model.getEditingLayer();
    if (!MapShaper.layerHasPaths(target.layer)) {
      gui.alert("This layer can not be simplified");
      return;
    }
    if (target.dataset.arcs.getVertexData().zz) {
      // TODO: try to avoid calculating pct (slow);
      showSlider(); // need to show slider before setting; TODO: fix
      control.value(target.dataset.arcs.getRetainedPct());
    } else {
      initMenu();
    }
  }

  function initMenu() {
    var dataset = model.getEditingLayer().dataset;
    var showPlanarOpt = !dataset.arcs.isPlanar();
    var opts = MapShaper.getStandardSimplifyOpts(dataset, dataset.info && dataset.info.simplify);
    El('#planar-opt-wrapper').node().style.display = showPlanarOpt ? 'block' : 'none';
    El('#planar-opt').node().checked = !opts.spherical;
    El("#import-retain-opt").node().checked = opts.keep_shapes;
    El("#simplify-options input[value=" + opts.method + "]").node().checked = true;
    menu.show();
  }

  function turnOff() {
    menu.hide();
    control.reset();
  }

  function onSubmit() {
    var dataset = model.getEditingLayer().dataset;
    var showMsg = dataset.arcs && dataset.arcs.getPointCount() > 1e6;
    var delay = 0;
    if (showMsg) {
      delay = 35;
      gui.showProgressMessage('Calculating');
    }
    menu.hide();
    setTimeout(function() {
      var opts = getSimplifyOptions();
      mapshaper.simplify(dataset, opts);
      model.updated({
        // use presimplify flag if no vertices are removed
        // (to trigger map redraw without recalculating intersections)
        presimplify: opts.pct == 1,
        simplify: opts.pct < 1
      });
      showSlider();
      gui.clearProgressMessage();
    }, delay);
  }

  function showSlider() {
    el.show();
    El('body').addClass('simplify'); // for resizing, hiding layer label, etc.
  }

  function getSimplifyOptions() {
    var method = El('#simplify-options input[name=method]:checked').attr('value') || null;
    return {
      method: method,
      pct: _value,
      no_repair: true,
      keep_shapes: !!El("#import-retain-opt").node().checked,
      planar: !!El('#planar-opt').node().checked
    };
  }

  function toSliderPct(p) {
    p = Math.sqrt(p);
    var pct = 1 - p;
    return pct;
  }

  function fromSliderPct(p) {
    var pct = 1 - p;
    return pct * pct;
  }

  function onchange(val) {
    if (_value != val) {
      _value = val;
      control.dispatchEvent('change', {value:val});
    }
  }

  control.reset = function() {
    control.value(1);
    el.hide();
    menu.hide();
    El('body').removeClass('simplify');
  };

  control.value = function(val) {
    if (!isNaN(val)) {
      // TODO: validate
      _value = val;
      slider.pct(toSliderPct(val));
      text.value(val);
    }
    return _value;
  };

  control.value(_value);
  return control;
};


// Assume zip.js is loaded and zip is defined globally
zip.workerScripts = {
  // deflater: ['z-worker.js', 'deflate.js'], // use zip.js deflater
  // TODO: find out why it was necessary to rename pako_deflate.min.js
  deflater: ['z-worker.js', 'pako.deflate.js', 'codecs.js'],
  inflater: ['z-worker.js', 'pako.inflate.js', 'codecs.js']
};

// @file: Zip file
// @cb: function(err, <files>)
//
gui.readZipFile = function(file, cb) {
  var _files = [];
  zip.createReader(new zip.BlobReader(file), importZipContent, onError);

  function onError(err) {
    cb(err);
  }

  function onDone() {
    cb(null, _files);
  }

  function importZipContent(reader) {
    var _entries;
    reader.getEntries(readEntries);

    function readEntries(entries) {
      _entries = entries || [];
      readNext();
    }

    function readNext() {
      if (_entries.length > 0) {
        readEntry(_entries.pop());
      } else {
        reader.close();
        onDone();
      }
    }

    function readEntry(entry) {
      var filename = entry.filename,
          isValid = !entry.directory && gui.isReadableFileType(filename) &&
              !/^__MACOSX/.test(filename); // ignore "resource-force" files
      if (isValid) {
        entry.getData(new zip.BlobWriter(), function(file) {
          file.name = filename; // Give the Blob a name, like a File object
          _files.push(file);
          readNext();
        });
      } else {
        readNext();
      }
    }
  }
};




gui.showProgressMessage = function(msg) {
  if (!gui.progressMessage) {
    gui.progressMessage = El('div').id('progress-message')
      .appendTo('body');
  }
  El('<div>').text(msg).appendTo(gui.progressMessage.empty().show());
};

gui.clearProgressMessage = function() {
  if (gui.progressMessage) gui.progressMessage.hide();
};




gui.parseFreeformOptions = function(raw, cmd) {
  var str = raw.trim(),
      parsed;
  if (!str) {
    return {};
  }
  if (!/^-/.test(str)) {
    str = '-' + cmd + ' ' + str;
  }
  parsed =  MapShaper.parseCommands(str);
  if (!parsed.length || parsed[0].name != cmd) {
    stop("Unable to parse command line options");
  }
  return parsed[0].options;
};




// tests if filename is a type that can be used
gui.isReadableFileType = function(filename) {
  var ext = utils.getFileExtension(filename).toLowerCase();
  return !!MapShaper.guessInputFileType(filename) || MapShaper.couldBeDsvFile(filename) ||
    MapShaper.isZipFile(filename);
};

// @cb function(<FileList>)
function DropControl(cb) {
  var el = El('body');
  el.on('dragleave', ondrag);
  el.on('dragover', ondrag);
  el.on('drop', ondrop);
  function ondrag(e) {
    // blocking drag events enables drop event
    e.preventDefault();
  }
  function ondrop(e) {
    e.preventDefault();
    cb(e.dataTransfer.files);
  }
}

// @el DOM element for select button
// @cb function(<FileList>)
function FileChooser(el, cb) {
  var btn = El(el).on('click', function() {
    input.el.click();
  });
  var input = El('form')
    .addClass('file-control').appendTo('body')
    .newChild('input')
    .attr('type', 'file')
    .attr('multiple', 'multiple')
    .on('change', onchange);

  function onchange(e) {
    var files = e.target.files;
    // files may be undefined (e.g. if user presses 'cancel' after a file has been selected)
    if (files) {
      // disable the button while files are being processed
      btn.addClass('selected');
      input.attr('disabled', true);
      cb(files);
      btn.removeClass('selected');
      input.attr('disabled', false);
    }
  }
}

function ImportControl(model) {
  new SimpleButton('#import-buttons .submit-btn').on('click', submitFiles);
  new SimpleButton('#import-buttons .cancel-btn').on('click', model.clearMode);
  var importCount = 0;
  var queuedFiles = [];

  model.addMode('import', turnOn, turnOff);
  new DropControl(receiveFiles);
  new FileChooser('#file-selection-btn', receiveFiles);
  new FileChooser('#import-buttons .add-btn', receiveFiles);
  new FileChooser('#add-file-btn', receiveFiles);
  model.enterMode('import');
  model.on('mode', function(e) {
    // re-open import opts if leaving alert or console modes and nothing has been imported yet
    if (!e.name && importCount === 0) {
      model.enterMode('import');
    }
  });

  function findMatchingShp(filename) {
    var shpName = utils.replaceFileExtension(filename, 'shp');
    return model.getDatasets().filter(function(d) {
      return shpName == d.info.input_files[0];
    });
  }

  function turnOn() {
    if (mapshaper.manifest) {
      downloadFiles(mapshaper.manifest);
      mapshaper.manifest = null;
    } else {
      El('#import-options').show();
    }
  }

  function close() {
    El('#fork-me').hide();
    El('#import-intro').hide(); // only show intro before first import
    El('#import-buttons').show();
    El('#import-options').hide();
  }

  function turnOff() {
    gui.clearProgressMessage();
    clearFiles();
    close();
  }

  function clearFiles() {
    queuedFiles = [];
    El('#dropped-file-list .file-list').empty();
    El('#dropped-file-list').hide();
  }

  function addFiles(files) {
    var index = {};
    queuedFiles = queuedFiles.concat(files).reduce(function(memo, f) {
      // filter out unreadable types and dupes
      if (gui.isReadableFileType(f.name) && f.name in index === false) {
        index[f.name] = true;
        memo.push(f);
      }
      return memo;
    }, []);
    // sort alphabetically by filename
    queuedFiles.sort(function(a, b) {
      return a.name > b.name ? 1 : -1;
    });
  }

  function showQueuedFiles() {
    var list = El('#dropped-file-list .file-list').empty();
    El('#dropped-file-list').show();
    queuedFiles.forEach(function(f) {
      El('<p>').text(f.name).appendTo(El("#dropped-file-list .file-list"));
    });
  }

  function receiveFiles(files) {
    var prevSize = queuedFiles.length;
    addFiles(utils.toArray(files));
    if (queuedFiles.length === 0) return;
    model.enterMode('import');
    if (importCount === 0 && prevSize === 0 && containsImmediateFile(queuedFiles)) {
      // if the first batch of files will be imported, process right away
      submitFiles();
    } else {
      showQueuedFiles();
      El('#import-buttons').show();
    }
  }

  // Check if an array of File objects contains a file that should be imported right away
  function containsImmediateFile(files) {
    return utils.some(files, function(f) {
        var type = MapShaper.guessInputFileType(f.name);
        return type == 'shp' || type == 'json';
    });
  }

  function submitFiles() {
    close();
    readNext();
  }

  function readNext() {
    if (queuedFiles.length > 0) {
      readFile(queuedFiles.pop()); // read in rev. alphabetic order, so .shp comes before .dbf
    } else {
      model.clearMode();
    }
  }

  function getImportOpts() {
    var freeform = El('#import-options .advanced-options').node().value,
        opts = gui.parseFreeformOptions(freeform, 'i');
    opts.no_repair = !El("#repair-intersections-opt").node().checked;
    opts.auto_snap = !!El("#snap-points-opt").node().checked;
    return opts;
  }

  function loadFile(file, cb) {
    var reader = new FileReader(),
        isBinary = MapShaper.isBinaryFile(file.name);
    // no callback on error -- fix?
    reader.onload = function(e) {
      cb(null, reader.result);
    };
    if (isBinary) {
      reader.readAsArrayBuffer(file);
    } else {
      // TODO: improve to handle encodings, etc.
      reader.readAsText(file, 'UTF-8');
    }
  }

  // @file a File object
  function readFile(file) {
    if (MapShaper.isZipFile(file.name)) {
      readZipFile(file);
    } else {
      loadFile(file, function(err, content) {
        if (err) {
          readNext();
        } else {
          readFileContent(file.name, content);
        }
      });
    }
  }

  function readFileContent(name, content) {
    var type = MapShaper.guessInputType(name, content),
        importOpts = getImportOpts(),
        matches = findMatchingShp(name),
        dataset, lyr;

    // TODO: refactor
    if (type == 'dbf' && matches.length > 0) {
      // find an imported .shp layer that is missing attribute data
      // (if multiple matches, try to use the most recently imported one)
      dataset = matches.reduce(function(memo, d) {
        if (!d.layers[0].data) {
          memo = d;
        }
        return memo;
      }, null);
      if (dataset) {
        lyr = dataset.layers[0];
        lyr.data = new MapShaper.ShapefileTable(content, importOpts.encoding);
        if (lyr.shapes && lyr.data.size() != lyr.shapes.length) {
          stop("Different number of records in .shp and .dbf files");
        }
        if (!lyr.geometry_type) {
          // kludge: trigger display of table cells if .shp has null geometry
          model.updated(null, lyr, dataset);
        }
        readNext();
        return;
      }
    }

    if (type == 'prj') {
      // assumes that .shp has been imported first
      matches.forEach(function(d) {
        if (!d.info.output_prj && !d.info.input_prj) {
          d.info.input_prj = content;
        }
      });
      readNext();
      return;
    }

    importFileContent(type, name, content, importOpts);
  }

  function importFileContent(type, path, content, importOpts) {
    var size = content.byteLength || content.length, // ArrayBuffer or string
        showMsg = size > 4e7, // don't show message if dataset is small
        delay = 0;
    importOpts.files = [path]; // TODO: try to remove this
    if (showMsg) {
      gui.showProgressMessage('Importing');
      delay = 35;
    }
    setTimeout(function() {
      var dataset = MapShaper.importFileContent(content, path, importOpts);
      dataset.info.no_repair = importOpts.no_repair;
      model.addDataset(dataset);
      importCount++;
      readNext();
    }, delay);
  }

  function readZipFile(file) {
    gui.showProgressMessage('Importing');
    setTimeout(function() {
      gui.readZipFile(file, function(err, files) {
        if (err) {
          console.log("Zip file loading failed:");
          throw err;
        }
        // don't try to import .txt files from zip files
        // (these would be parsed as dsv and throw errows)
        files = files.filter(function(f) {
          return !/\.txt$/i.test(f.name);
        });
        addFiles(files);
        readNext();
      });
    }, 35);
  }

  function downloadFiles(paths, opts) {
    paths = paths.filter(function(f) {
      return gui.isReadableFileType(f);
    });
    utils.reduceAsync(paths, [], downloadNextFile, function(err, files) {
      if (err || !files.length) {
        model.clearMode();
      } else {
        addFiles(files);
        submitFiles();
      }
    });
  }

  function downloadNextFile(memo, filepath, next) {
    var req = new XMLHttpRequest();
    req.responseType = 'blob';
    req.addEventListener('load', function(e) {
      var blob = req.response;
      blob.name = filepath;
      memo.push(blob);
      next(null, memo);
    });
    req.addEventListener('error', function(e) {
      next('error');
    });
    req.open('GET', '/data/' + filepath);
    req.send();
  }
}




// Export buttons and their behavior
var ExportControl = function(model) {
  var downloadSupport = typeof URL != 'undefined' && URL.createObjectURL &&
    typeof document.createElement("a").download != "undefined" ||
    !!window.navigator.msSaveBlob;
  var unsupportedMsg = "Exporting is not supported in this browser";
  var menu = El('#export-options').on('click', gui.handleDirectEvent(model.clearMode));
  var datasets = []; // array of exportable layers grouped by dataset
  var anchor, blobUrl;
  new SimpleButton('#export-options .cancel-btn').on('click', model.clearMode);

  if (!downloadSupport) {
    El('#export-btn').on('click', function() {
      gui.alert(unsupportedMsg);
    });

    MapShaper.writeFiles = function() {
      error(unsupportedMsg);
    };
  } else {
    anchor = menu.newChild('a').attr('href', '#').node();
    initExportButton();
    model.addMode('export', turnOn, turnOff);
    new ModeButton('#export-btn', 'export', model);

    MapShaper.writeFiles = function(files, opts, done) {
     
      if (!utils.isArray(files) || files.length === 0) {
        done("Nothing to export");
      }else if (opts.isEchartsType) {
        var content="";
        var fileFormat=".json";
        var filename=files[0].filename.replace('.json','');
        if(opts.isEchartsType==='json'){
           fileFormat=".json";
           content=Encoder.convert2Echarts(files[0].content, filename,'json');
        }else{
            fileFormat=".js";
           content=Encoder.convert2Echarts(files[0].content, filename,'js');
        }
        saveBlob(filename+fileFormat, new Blob([content]), done);
      }else if (files.length == 1) {
        saveBlob(files[0].filename, new Blob([files[0].content]), done);
      } else {
        filename = utils.getCommonFileBase(utils.pluck(files, 'filename')) || "output";
        saveZipFile(filename + ".zip", files, done);
      }
    };
  }

  function initLayerMenu() {
    // init layer menu with current editing layer selected
    var list = El('#export-layer-list').empty();
    var template = '<label><input type="checkbox" checked> %s</label>';
    var datasets = model.getDatasets().map(initDataset);
    var hideLayers = datasets.length == 1 && datasets[0].layers.length < 2;
    El('#export-layers').css('display', hideLayers ? 'none' : 'block');
    return datasets;

    function initDataset(dataset) {
      var layers = dataset.layers.map(function(lyr) {
        var html = utils.format(template, lyr.name || '[unnamed layer]');
        var box = El('div').html(html).appendTo(list).findChild('input').node();
        return {
          checkbox: box,
          layer: lyr
        };
      });
      return {
        dataset: dataset,
        layers: layers
      };
    }
  }

  function getInputFormats() {
    return model.getDatasets().reduce(function(memo, d) {
      var fmt = d.info && d.info.input_format;
      if (fmt) memo.push(fmt);
      return memo;
    }, []);
  }

  function getDefaultExportFormat() {
    var dataset = model.getEditingLayer().dataset;
    return dataset.info && dataset.info.input_format || 'geojson';
  }

  function initFormatMenu() {
    var defaults = ['shapefile', 'geojson', 'topojson', 'dsv','svg','echartsmapjson','echartsmapjs'];
    var formats = utils.uniq(defaults.concat(getInputFormats()));
    var items = formats.map(function(fmt) {
      return utils.format('<div><label><input type="radio" name="format" value="%s"' +
        ' class="radio">%s</label></div>', fmt, MapShaper.getFormatName(fmt));
    });
    El('#export-formats').html(items.join('\n'));
    El('#export-formats input[value="' + getDefaultExportFormat() + '"]').node().checked = true;
  }

  function turnOn() {
    datasets = initLayerMenu();
    initFormatMenu();
    menu.show();
  }

  function turnOff() {
    menu.hide();
  }

  function getSelectedFormat() {
    return El('#export-formats input:checked').node().value;
  }

  function getSelectedLayers() {
    var selections = datasets.reduce(function(memo, obj) {
      var dataset = obj.dataset;
      var selection = obj.layers.reduce(reduceLayer, []);
      if (selection.length > 0) {
        memo.push(utils.defaults({layers: selection}, dataset));
      }
      return memo;
    }, []);

    function reduceLayer(memo, obj) {
      if (obj.checkbox.checked) {
        // shallow-copy layer, so uniqified filenames do not affect original layers
        memo.push(utils.extend({}, obj.layer));
      }
      return memo;
    }
    return selections;
  }

  function initExportButton() {
    new SimpleButton('#save-btn').on('click', function() {
      gui.showProgressMessage('Exporting');
      model.clearMode();
      setTimeout(function() {
        exportMenuSelection(function(err) {
          if (err) {
            if (utils.isString(err)) {
              gui.alert(err);
            } else {
              // stack seems to change if Error is logged directly
              console.error(err.stack);
              gui.alert("Export failed for an unknown reason");
            }
          }
          // hide message after a delay, so it doesn't just flash for an instant.
          setTimeout(gui.clearProgressMessage, err ? 0 : 400);
        });
      }, 20);
    });
  }

  // @done function(string|Error|null)
  function exportMenuSelection(done) {
    var opts, files, datasets;
    try {
      opts = gui.parseFreeformOptions(El('#export-options .advanced-options').node().value, 'o');
      if (!opts.format) opts.format = getSelectedFormat();
      if(opts.format==='echartsmapjson'){
          opts.format='geojson';
          opts.isEchartsType='json';
      }else if(opts.format==='echartsmapjs'){
          opts.format='geojson';
          opts.isEchartsType='js';
      }
      // ignoring command line "target" option
      datasets = getSelectedLayers();
      if (isMultiLayerFormat(opts.format)) {
        // merge multiple datasets into one for export as SVG or TopoJSON
        if (datasets.length > 1) {
          datasets = [MapShaper.mergeDatasetsForExport(datasets)];
          if (opts.format == 'topojson') {
            // Build topology, in case user has loaded several
            // files derived from the same source, with matching coordinates
            // (Downsides: useless work if geometry is unrelated;
            // could create many small arcs if layers are partially related)
            api.buildTopology(datasets[0]);
          }
          // KLUDGE let exporter know that cloning is not needed
          // (because shape data was deep-copied during merge)
          opts.cloned = true;
        }
      } else {
        MapShaper.assignUniqueLayerNames2(datasets);
      }
      files = datasets.reduce(function(memo, dataset) {
        var output = MapShaper.exportFileContent(dataset, opts);
        return memo.concat(output);
      }, []);
      // multiple output files will be zipped, need unique names
      MapShaper.assignUniqueFileNames(files);
    } catch(e) {
      return done(e);
    }
    MapShaper.writeFiles(files, opts, done);
  }

  function isMultiLayerFormat(fmt) {
    return fmt == 'svg' || fmt == 'topojson';
  }

  function saveBlob(filename, blob, done) {
    if (window.navigator.msSaveBlob) {
      window.navigator.msSaveBlob(blob, filename);
      done();
    }
    try {
      // revoke previous download url, if any. TODO: do this when download completes (how?)
      if (blobUrl) URL.revokeObjectURL(blobUrl);
      blobUrl = URL.createObjectURL(blob);
    } catch(e) {
      done("Mapshaper can't export files from this browser. Try switching to Chrome or Firefox.");
      return;
    }

    // TODO: handle errors
    anchor.href = blobUrl;
    anchor.download = filename;
    var clickEvent = document.createEvent("MouseEvent");
    clickEvent.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false,
        false, false, false, 0, null);
    anchor.dispatchEvent(clickEvent);
    done();
  }

  function saveZipFile(zipfileName, files, done) {
    var toAdd = files;
    try {
      zip.createWriter(new zip.BlobWriter("application/zip"), addFile, zipError);
    } catch(e) {
      // TODO: show proper error message, not alert
      done("This browser doesn't support Zip file creation.");
    }

    function zipError(msg) {
      var str = "Error creating Zip file";
      if (msg) {
        str += ": " + (msg.message || msg);
      }
      done(str);
    }

    function addFile(archive) {
      if (toAdd.length === 0) {
        archive.close(function(blob) {
          saveBlob(zipfileName, blob, done);
        });
      } else {
        var obj = toAdd.pop(),
            blob = new Blob([obj.content]);
        archive.add(obj.filename, new zip.BlobReader(blob), function() {addFile(archive);});
      }
    }
  }
};




function RepairControl(model, map) {
  var el = El("#intersection-display"),
      readout = el.findChild("#intersection-count"),
      btn = el.findChild("#repair-btn"),
      _self = this,
      _dataset, _currXX;

  model.on('update', function(e) {
    if (e.flags.simplify || e.flags.proj || e.flags.arc_count) {
      // these changes require nulling out any cached intersection data and recalculating
      if (_dataset) {
        _dataset.info.intersections = null;
        _dataset = null;
        _self.hide();
      }
      delayedUpdate();
    } else if (e.flags.select) {
      _self.hide();
      if (!e.flags.import) {
        // Don't recalculate if a dataset was just imported -- another layer may be
        // selected right away.
        reset();
        delayedUpdate();
      }
    }
  });

  model.on('mode', function(e) {
    if (e.prev == 'import') {
      // update if import just finished and a new dataset is being edited
      delayedUpdate();
    }
  });

  btn.on('click', function() {
    var fixed = MapShaper.repairIntersections(_dataset.arcs, _currXX);
    showIntersections(fixed);
    btn.addClass('disabled');
    model.updated({repair: true});
  });

  this.hide = function() {
    el.hide();
    map.setHighlightLayer(null);
  };

  // Detect and display intersections for current level of arc simplification
  this.update = function() {
    var XX, showBtn, pct;
    if (!_dataset) return;
    if (_dataset.arcs.getRetainedInterval() > 0) {
      // TODO: cache these intersections
      XX = MapShaper.findSegmentIntersections(_dataset.arcs);
      showBtn = XX.length > 0;
    } else { // no simplification
      XX = _dataset.info.intersections;
      if (!XX) {
        // cache intersections at 0 simplification, to avoid recalculating
        // every time the simplification slider is set to 100% or the layer is selected at 100%
        XX = _dataset.info.intersections = MapShaper.findSegmentIntersections(_dataset.arcs);
      }
      showBtn = false;
    }
    el.show();
    showIntersections(XX);
    btn.classed('disabled', !showBtn);
  };

  function delayedUpdate() {
    setTimeout(function() {
      var e = model.getEditingLayer();
      if (e.dataset && e.dataset != _dataset && !e.dataset.info.no_repair &&
          MapShaper.layerHasPaths(e.layer)) {
        _dataset = e.dataset;
        _self.update();
      }
    }, 10);
  }

  function reset() {
    _dataset = null;
    _currXX = null;
    _self.hide();
  }

  function showIntersections(XX) {
    var n = XX.length, pointLyr;
    _currXX = XX;
    if (n > 0) {
      pointLyr = {geometry_type: 'point', shapes: [MapShaper.getIntersectionPoints(XX)]};
      map.setHighlightLayer(pointLyr, {layers:[pointLyr]});
      readout.text(utils.format("%s line intersection%s", n, utils.pluralSuffix(n)));
    } else {
      map.setHighlightLayer(null);
      readout.text('');
    }
  }
}

utils.inherit(RepairControl, EventDispatcher);




function LayerControl(model) {
  var el = El("#layer-control").on('click', gui.handleDirectEvent(model.clearMode));
  var buttonLabel = El('#layer-control-btn .layer-name');
  var isOpen = false;

  new ModeButton('#layer-control-btn .header-btn', 'layer_menu', model);
  model.addMode('layer_menu', turnOn, turnOff);
  model.on('update', function(e) {
    updateBtn();
    if (isOpen) render();
  });

  function turnOn() {
    isOpen = true;
    render();
    el.show();
  }

  function turnOff() {
    isOpen = false;
    el.hide();
  }

  function updateBtn() {
    var name = model.getEditingLayer().layer.name || "[unnamed layer]";
    buttonLabel.html(name + " &nbsp;&#9660;");
  }

  function render() {
    var list = El('#layer-control .layer-list');
    if (isOpen) {
      list.hide().empty();
      model.forEachLayer(function(lyr, dataset) {
        list.appendChild(renderLayer(lyr, dataset));
      });
      list.show();
    }
  }

  function describeLyr(lyr) {
    var n = MapShaper.getFeatureCount(lyr),
        str, type;
    if (lyr.data && !lyr.shapes) {
      type = 'data record';
    } else if (lyr.geometry_type) {
      type = lyr.geometry_type + ' feature';
    }
    if (type) {
      str = utils.format('%,d %s%s', n, type, utils.pluralSuffix(n));
    } else {
      str = "[empty]";
    }
    return str;
  }

  function describeSrc(lyr, dataset) {
    var file = dataset.info.input_files[0] || '';
    if (utils.endsWith(file, '.shp') && !lyr.data && lyr == dataset.layers[0]) {
      file += " (missing .dbf)";
    }
    return file;
  }

  function getDisplayName(name) {
    return name || '[unnamed]';
  }

  function renderLayer(lyr, dataset) {
    var editLyr = model.getEditingLayer().layer;
    var entry = El('div').addClass('layer-item').classed('active', lyr == editLyr);
    var html = rowHTML('name', '<span class="layer-name colored-text dot-underline">' + getDisplayName(lyr.name) + '</span>');
    html += rowHTML('source file', describeSrc(lyr, dataset));
    html += rowHTML('contents', describeLyr(lyr));
    html += '<img src="images/close.png">';
    entry.html(html);
    // init delete button
    entry.findChild('img').on('mouseup', function(e) {
        e.stopPropagation();
        deleteLayer(lyr, dataset);
      });
    // init name editor
    new ClickText2(entry.findChild('.layer-name'))
      .on('change', function(e) {
        var str = cleanLayerName(this.value());
        this.value(getDisplayName(str));
        lyr.name = str;
        updateBtn();
      });
    // init click-to-select
    gui.onClick(entry, function() {
      if (!gui.getInputElement()) { // don't select if user is typing
        model.clearMode();
        if (lyr != editLyr) {
          model.updated({select: true}, lyr, dataset);
        }
      }
    });
    return entry;
  }

  function deleteLayer(lyr, dataset) {
    var otherLyr = model.findAnotherLayer(lyr);
    if (otherLyr) {
      turnOff(); // avoid rendering twice
      if (model.getEditingLayer().layer == lyr) {
        // switch to a different layer if deleted layer was selected
        model.selectLayer(otherLyr.layer, otherLyr.dataset);
      }
      model.deleteLayer(lyr, dataset);
      turnOn();
    } else {
      // refresh browser if deleted layer was the last layer
      window.location.href = window.location.href.toString();
    }
  }

  function cleanLayerName(raw) {
    return raw.replace(/[\n\t/\\]/g, '')
      .replace(/^[\.\s]+/, '').replace(/[\.\s]+$/, '');
  }

  function rowHTML(c1, c2) {
    return utils.format('<div class="row"><div class="col1">%s</div>' +
      '<div class="col2">%s</div></div>', c1, c2);
  }
}




// These functions could be called when validating i/o options; TODO: avoid this
cli.isFile =
cli.isDirectory = function(name) {return false;};

cli.validateOutputDir = function() {};

// Replaces functions for reading from files with functions that try to match
// already-loaded datasets.
//
function ImportFileProxy(model) {
  // Try to match an imported dataset or layer.
  // TODO: think about handling import options
  function find(src) {
    var datasets = model.getDatasets();
    var retn = datasets.reduce(function(memo, d) {
      var lyr;
      if (memo) return memo; // already found a match
      // try to match import filename of this dataset
      if (d.info.input_files[0] == src) return d;
      // try to match name of a layer in this dataset
      lyr = utils.find(d.layers, function(lyr) {return lyr.name == src;});
      return lyr ? MapShaper.isolateLayer(lyr, d) : null;
    }, null);
    if (!retn) stop("Missing data layer [" + src + "]");
    return retn;
  }

  api.importFile = function(src, opts) {
    var dataset = find(src);
    // Aeturn a copy with layers duplicated, so changes won't affect original layers
    // This makes an (unsafe) assumption that the dataset arcs won't be changed...
    // need to rethink this.
    return utils.defaults({
      layers: dataset.layers.map(MapShaper.copyLayer)
    }, dataset);
  };

  api.importDataTable = function(src, opts) {
    var dataset = find(src);
    return dataset.layers[0].data;
  };
}




gui.getPixelRatio = function() {
  var deviceRatio = window.devicePixelRatio || window.webkitDevicePixelRatio || 1;
  return deviceRatio > 1 ? 2 : 1;
};

function DisplayCanvas() {
  var _self = El('canvas'),
      _canvas = _self.node(),
      _ctx = _canvas.getContext('2d'),
      _ext;

  _self.prep = function(extent) {
    var w = extent.width(),
        h = extent.height(),
        pixRatio = gui.getPixelRatio();
    _ctx.clearRect(0, 0, _canvas.width, _canvas.height);
    _canvas.width = w * pixRatio;
    _canvas.height = h * pixRatio;
    _self.classed('retina', pixRatio == 2);
    _self.show();
    _ext = extent;
  };

  _self.drawPathShapes = function(shapes, arcs, style) {
    var start = getPathStart(style, _ext),
        draw = getShapePencil(arcs, _ext),
        end = getPathEnd(style);
    for (var i=0, n=shapes.length; i<n; i++) {
      start(_ctx, i);
      draw(shapes[i], _ctx);
      end(_ctx);
    }
  };

  _self.drawSquareDots = function(shapes, style) {
    var t = getScaledTransform(_ext),
        pixRatio = gui.getPixelRatio(),
        size = (style.dotSize || 3) * pixRatio,
        styler = style.styler || null,
        shp, p;

    _ctx.fillStyle = style.dotColor || "black";
    // TODO: don't try to draw offscreen points
    for (var i=0, n=shapes.length; i<n; i++) {
      if (styler !== null) {
        styler(style, i);
        size = style.dotSize * pixRatio;
        _ctx.fillStyle = style.dotColor;
      }
      shp = shapes[i];
      for (var j=0, m=shp ? shp.length : 0; j<m; j++) {
        if (!shp) continue;
        p = shp[j];
        drawSquare(p[0] * t.mx + t.bx, p[1] * t.my + t.by, size, _ctx);
      }
    }
  };

  _self.drawPoints = function(shapes, style) {
    var t = getScaledTransform(_ext),
        pixRatio = gui.getPixelRatio(),
        start = getPathStart(style, _ext),
        end = getPathEnd(style),
        shp, p;

    for (var i=0, n=shapes.length; i<n; i++) {
      shp = shapes[i];
      start(_ctx, i);
      if (!shp || style.radius > 0 === false) continue;
      for (var j=0, m=shp ? shp.length : 0; j<m; j++) {
        p = shp[j];
        drawCircle(p[0] * t.mx + t.bx, p[1] * t.my + t.by, style.radius * pixRatio, _ctx);
      }
      end(_ctx);
    }
  };

  _self.drawArcs = function(arcs, flags, style) {
    var darkStyle = {strokeWidth: style.strokeWidth, strokeColor: style.strokeColors[1]},
        lightStyle = {strokeWidth: style.strokeWidth, strokeColor: style.strokeColors[0]};
    setArcVisibility(flags, arcs);
    drawFlaggedArcs(2, flags, lightStyle, arcs);
    drawFlaggedArcs(3, flags, darkStyle, arcs);
  };

  function setArcVisibility(flags, arcs) {
    var minPathLen = 0.5 * _ext.getPixelSize(),
        geoBounds = _ext.getBounds(),
        geoBBox = geoBounds.toArray(),
        allIn = geoBounds.contains(arcs.getBounds()),
        visible;
    // don't continue dropping paths if user zooms out farther than full extent
    if (_ext.scale() < 1) minPathLen *= _ext.scale();
    for (var i=0, n=arcs.size(); i<n; i++) {
      visible = !arcs.arcIsSmaller(i, minPathLen) && (allIn ||
          arcs.arcIntersectsBBox(i, geoBBox));
      // mark visible arcs by setting second flag bit to 1
      flags[i] = (flags[i] & 1) | (visible ? 2 : 0);
    }
  }

  function drawFlaggedArcs(flag, flags, style, arcs) {
    var start = getPathStart(style, _ext),
        end = getPathEnd(style),
        t = getScaledTransform(_ext),
        ctx = _ctx,
        n = 25, // render paths in batches of this size (an optimization)
        count = 0;
    start(ctx);
    for (i=0, n=arcs.size(); i<n; i++) {
      if (flags[i] != flag) continue;
      if (++count % n === 0) {
        end(ctx);
        start(ctx);
      }
      drawPath(arcs.getArcIter(i), t, ctx);
    }
    end(ctx);
  }

  return _self;
}

function getScaledTransform(ext) {
  return ext.getTransform(gui.getPixelRatio());
}

function drawCircle(x, y, radius, ctx) {
  if (radius > 0) {
    ctx.moveTo(x + radius, y);
    ctx.arc(x, y, radius, 0, Math.PI * 2, true);
  }
}

function drawSquare(x, y, size, ctx) {
  if (size > 0) {
    var offs = size / 2;
    x = Math.round(x - offs);
    y = Math.round(y - offs);
    ctx.fillRect(x, y, size, size);
  }
}

function drawPath(vec, t, ctx) {
  var minLen = gui.getPixelRatio() > 1 ? 1 : 0.6,
      x, y, xp, yp;
  if (!vec.hasNext()) return;
  x = xp = vec.x * t.mx + t.bx;
  y = yp = vec.y * t.my + t.by;
  ctx.moveTo(x, y);
  while (vec.hasNext()) {
    x = vec.x * t.mx + t.bx;
    y = vec.y * t.my + t.by;
    if (Math.abs(x - xp) > minLen || Math.abs(y - yp) > minLen) {
      ctx.lineTo(x, y);
      xp = x;
      yp = y;
    }
  }
  if (x != xp || y != yp) {
    ctx.lineTo(x, y);
  }
}

function getShapePencil(arcs, ext) {
  var t = getScaledTransform(ext);
  return function(shp, ctx) {
    var iter = new MapShaper.ShapeIter(arcs);
    if (!shp) return;
    for (var i=0; i<shp.length; i++) {
      iter.init(shp[i]);
      drawPath(iter, t, ctx);
    }
  };
}

function getPathStart(style, ext) {
  var mapScale = ext.scale(),
      styler = style.styler || null,
      pixRatio = gui.getPixelRatio(),
      lineScale = 1;

  // vary line width according to zoom ratio; for performance and clarity,
  // don't start thickening lines until zoomed quite far in.
  if (mapScale < 1) {
    lineScale *= Math.pow(mapScale, 0.6);
  } else if (mapScale > 60) {
    lineScale *= Math.pow(mapScale - 59, 0.18);
  }

  return function(ctx, i) {
    var strokeWidth;
    ctx.beginPath();
    if (styler) {
      styler(style, i);
    }
    if (style.opacity >= 0) {
      ctx.globalAlpha = style.opacity;
    }
    if (style.strokeWidth > 0) {
      strokeWidth = style.strokeWidth;
      if (pixRatio > 1) {
        // bump up thin lines on retina, but not to more than 1px (too slow)
        strokeWidth = strokeWidth < 1 ? 1 : strokeWidth * pixRatio;
      }
      ctx.lineCap = 'round';
      ctx.lineJoin = 'round';
      ctx.lineWidth = strokeWidth * lineScale;
      ctx.strokeStyle = style.strokeColor;
    }
    if (style.fillColor) {
      ctx.fillStyle = style.fillColor;
    }
  };
}

function getPathEnd(style) {
  return function(ctx) {
    if (style.fillColor) ctx.fill();
    if (style.strokeWidth > 0) ctx.stroke();
    if (style.opacity >= 0) ctx.globalAlpha = 1;
    ctx.closePath();
  };
}




// A wrapper for ArcCollection that filters paths to speed up rendering.
//
function FilteredArcCollection(unfilteredArcs) {
  var sortedThresholds,
      filteredArcs,
      filteredSegLen;

  init();

  function init() {
    var size = unfilteredArcs.getPointCount(),
        cutoff = 5e5,
        nth;
    sortedThresholds = filteredArcs = null;
    if (!!unfilteredArcs.getVertexData().zz) {
      // If we have simplification data...
      // Sort simplification thresholds for all non-endpoint vertices
      // for quick conversion of simplification percentage to threshold value.
      // For large datasets, use every nth point, for faster sorting.
      nth = Math.ceil(size / cutoff);
      sortedThresholds = unfilteredArcs.getRemovableThresholds(nth);
      utils.quicksort(sortedThresholds, false);
      // For large datasets, create a filtered copy of the data for faster rendering
      if (size > cutoff) {
        filteredArcs = initFilteredArcs(unfilteredArcs, sortedThresholds);
        filteredSegLen = MapShaper.getAvgSegment(filteredArcs);
      }
    } else {
      if (size > cutoff) {
        // generate filtered arcs when no simplification data is present
        filteredSegLen = MapShaper.getAvgSegment(unfilteredArcs) * 4;
        filteredArcs = MapShaper.simplifyArcsFast(unfilteredArcs, filteredSegLen);
      }
    }
  }

  // Use simplification data to create a low-detail copy of arcs, for faster
  // rendering when zoomed-out.
  function initFilteredArcs(arcs, sortedThresholds) {
    var filterPct = 0.08;
    var currInterval = arcs.getRetainedInterval();
    var filterZ = sortedThresholds[Math.floor(filterPct * sortedThresholds.length)];
    var filteredArcs = arcs.setRetainedInterval(filterZ).getFilteredCopy();
    arcs.setRetainedInterval(currInterval); // reset current simplification
    return filteredArcs;
  }

  this.getArcCollection = function(ext) {
    refreshFilteredArcs();
    // Use a filtered version of arcs at small scales
    var unitsPerPixel = 1/ext.getTransform().mx,
        useFiltering = filteredArcs && unitsPerPixel > filteredSegLen * 1.5;
    return useFiltering ? filteredArcs : unfilteredArcs;
  };

  function refreshFilteredArcs() {
    if (filteredArcs) {
      if (filteredArcs.size() != unfilteredArcs.size()) {
        init();
      }
      filteredArcs.setRetainedInterval(unfilteredArcs.getRetainedInterval());
    }
  }

  this.size = function() {return unfilteredArcs.size();};

  this.setRetainedPct = function(pct) {
    if (sortedThresholds) {
      var z = sortedThresholds[Math.floor(pct * sortedThresholds.length)];
      z = MapShaper.clampIntervalByPct(z, pct);
      // this.setRetainedInterval(z);
      unfilteredArcs.setRetainedInterval(z);
    } else {
      unfilteredArcs.setRetainedPct(pct);
    }
  };
}




gui.getDisplayLayerForTable = function(table) {
  var n = table.size(),
      cellWidth = 12,
      cellHeight = 5,
      gutter = 6,
      arcs = [],
      shapes = [],
      lyr = {shapes: shapes},
      data = {layer: lyr},
      aspectRatio = 1.1,
      usePoints = false,
      x, y, col, row, blockSize;

  if (n > 10000) {
    usePoints = true;
    gutter = 0;
    cellWidth = 4;
    cellHeight = 4;
    aspectRatio = 1.45;
  } else if (n > 5000) {
    cellWidth = 5;
    gutter = 3;
    aspectRatio = 1.45;
  } else if (n > 1000) {
    gutter = 3;
    cellWidth = 8;
    aspectRatio = 1.3;
  }

  if (n < 25) {
    blockSize = n;
  } else {
    blockSize = Math.sqrt(n * (cellWidth + gutter) / cellHeight / aspectRatio) | 0;
  }

  for (var i=0; i<n; i++) {
    row = i % blockSize;
    col = Math.floor(i / blockSize);
    x = col * (cellWidth + gutter);
    y = cellHeight * (blockSize - row);
    if (usePoints) {
      shapes.push([[x, y]]);
    } else {
      arcs.push(getArc(x, y, cellWidth, cellHeight));
      shapes.push([[i]]);
    }
  }

  if (usePoints) {
    lyr.geometry_type = 'point';
  } else {
    data.arcs = new MapShaper.ArcCollection(arcs);
    lyr.geometry_type = 'polygon';
  }
  lyr.data = table;

  function getArc(x, y, w, h) {
    return [[x, y], [x + w, y], [x + w, y - h], [x, y - h], [x, y]];
  }

  return data;
};




function DisplayLayer(lyr, dataset, ext) {
  var _displayBounds;

  init();

  this.setStyle = function(o) {
    lyr.display.style = o;
  };

  this.getBounds = function() {
    return _displayBounds;
  };

  this.setRetainedPct = function(pct) {
    var arcs = dataset.filteredArcs || dataset.arcs;
    if (arcs) {
      arcs.setRetainedPct(pct);
    }
  };

  this.updateStyle = function(style) {
    var o = this.getDisplayLayer();
    // arc style
    if (o.dataset.arcs) {
      lyr.display.arcFlags = new Uint8Array(o.dataset.arcs.size());
      if (MapShaper.layerHasPaths(o.layer)) {
        initArcFlags(o.layer.shapes, lyr.display.arcFlags);
      }
    }
  };

  // @ext map extent
  this.getDisplayLayer = function() {
    var arcs = lyr.display.arcs,
        layer = lyr.display.layer || lyr;
    if (!arcs) {
      // use filtered arcs if available & map extent is known
      arcs = dataset.filteredArcs ?
        dataset.filteredArcs.getArcCollection(ext) : dataset.arcs;
    }
    return {
      layer: layer,
      dataset: {arcs: arcs},
      geographic: layer == lyr // false if using table-only shapes
    };
  };

  this.draw = function(canv, style) {
    style = style || lyr.display.style;
    if (style.type == 'outline') {
      this.drawStructure(canv, style);
    } else {
      this.drawShapes(canv, style);
    }
  };

  this.drawStructure = function(canv, style) {
    var obj = this.getDisplayLayer(ext);
    var arcs = obj.dataset.arcs;
    if (arcs && lyr.display.arcFlags) {
      canv.drawArcs(arcs, lyr.display.arcFlags, style);
    }
    if (obj.layer.geometry_type == 'point') {
      canv.drawSquareDots(obj.layer.shapes, style);
    }
  };

  this.drawShapes = function(canv, style) {
    var obj = this.getDisplayLayer(ext);
    var lyr = style.ids ? filterLayer(obj.layer, style.ids) : obj.layer;
    if (lyr.geometry_type == 'point') {
      if (style.type == 'styled') {
        canv.drawPoints(lyr.shapes, style);
      } else {
        canv.drawSquareDots(lyr.shapes, style);
      }
    } else {
      canv.drawPathShapes(lyr.shapes, obj.dataset.arcs, style);
    }
  };

  function filterLayer(lyr, ids) {
    if (lyr.shapes) {
      shapes = ids.map(function(id) {
        return lyr.shapes[id];
      });
      return utils.defaults({shapes: shapes}, lyr);
    }
    return lyr;
  }

  function initArcFlags(shapes, arr) {
    // Arcs belonging to at least one path are flagged 1, others 0
    MapShaper.countArcsInShapes(shapes, arr);
    for (var i=0, n=arr.length; i<n; i++) {
      arr[i] = arr[i] === 0 ? 0 : 1;
    }
  }

  function init() {
    var display = lyr.display = lyr.display || {};

    // init filtered arcs, if needed
    if (MapShaper.layerHasPaths(lyr) && !dataset.filteredArcs) {
      dataset.filteredArcs = new FilteredArcCollection(dataset.arcs);
    }

    // init table shapes, if needed
    if (lyr.data && !lyr.geometry_type) {
      if (!display.layer || display.layer.shapes.length != lyr.data.size()) {
        utils.extend(display, gui.getDisplayLayerForTable(lyr.data));
      }
    } else if (display.layer) {
      delete display.layer;
      delete display.arcs;
    }

    _displayBounds = getDisplayBounds(display.layer || lyr, display.arcs || dataset.arcs);
  }
}

function getDisplayBounds(lyr, arcs) {
  var arcBounds = arcs ? arcs.getBounds() : new Bounds(),
      bounds = arcBounds, // default display extent: all arcs in the dataset
      lyrBounds;

  if (lyr.geometry_type == 'point') {
    lyrBounds = MapShaper.getLayerBounds(lyr);
    if (lyrBounds && lyrBounds.hasBounds()) {
      if (lyrBounds.area() > 0 || arcBounds.area() === 0) {
        bounds = lyrBounds;
      }
      // if a point layer has no extent (e.g. contains only a single point),
      // then use arc bounds (if present), to match any path layers in the dataset.
    }
  }

  // If a layer has collapsed, inflate it by a default amount
  if (bounds.width() === 0) {
    bounds.xmin = (bounds.centerX() || 0) - 1;
    bounds.xmax = bounds.xmin + 2;
  }
  if (bounds.height() === 0) {
    bounds.ymin = (bounds.centerY() || 0) - 1;
    bounds.ymax = bounds.ymin + 2;
  }
  return bounds;
}




function HighlightBox(el) {
  var stroke = 2,
      box = El('div').addClass('zoom-box').appendTo(el).hide();
  this.show = function(x1, y1, x2, y2) {
    var w = Math.abs(x1 - x2),
        h = Math.abs(y1 - y2);
    box.css({
      top: Math.min(y1, y2),
      left: Math.min(x1, x2),
      width: Math.max(w - stroke * 2, 1),
      height: Math.max(h - stroke * 2, 1)
    });
    box.show();
  };
  this.hide = function() {
    box.hide();
  };
}




gui.addSidebarButton = function(iconId) {
  var btn = El('div').addClass('nav-btn')
    .on('dblclick', function(e) {e.stopPropagation();}); // block dblclick zoom
  btn.appendChild(iconId);
  btn.appendTo('#nav-buttons');
  return btn;
};

function MapNav(root, ext, mouse) {
  var wheel = new MouseWheel(mouse),
      zoomBox = new HighlightBox('body'),
      buttons = El('div').id('nav-buttons').appendTo(root),
      zoomTween = new Tween(Tween.sineInOut),
      shiftDrag = false,
      zoomScale = 2.5,
      dragStartEvt, _fx, _fy; // zoom foci, [0,1]

  gui.addSidebarButton("#home-icon").on('click', function() {ext.reset();});
  gui.addSidebarButton("#zoom-in-icon").on('click', zoomIn);
  gui.addSidebarButton("#zoom-out-icon").on('click', zoomOut);

  zoomTween.on('change', function(e) {
    ext.rescale(e.value, _fx, _fy);
  });

  mouse.on('dblclick', function(e) {
    zoomByPct(zoomScale, e.x / ext.width(), e.y / ext.height());
  });

  mouse.on('dragstart', function(e) {
    shiftDrag = !!e.shiftKey;
    if (shiftDrag) {
      dragStartEvt = e;
    }
  });

  mouse.on('drag', function(e) {
    if (shiftDrag) {
      zoomBox.show(e.pageX, e.pageY, dragStartEvt.pageX, dragStartEvt.pageY);
    } else {
      ext.pan(e.dx, e.dy);
    }
  });

  mouse.on('dragend', function(e) {
    var bounds;
    if (shiftDrag) {
      shiftDrag = false;
      bounds = new Bounds(e.x, e.y, dragStartEvt.x, dragStartEvt.y);
      zoomBox.hide();
      if (bounds.width() > 5 && bounds.height() > 5) {
        zoomToBox(bounds);
      }
    }
  });

  wheel.on('mousewheel', function(e) {
    var k = 1 + (0.11 * e.multiplier),
        delta = e.direction > 0 ? k : 1 / k;
    ext.rescale(ext.scale() * delta, e.x / ext.width(), e.y / ext.height());
  });

  function zoomIn() {
    zoomByPct(zoomScale, 0.5, 0.5);
  }

  function zoomOut() {
    zoomByPct(1/zoomScale, 0.5, 0.5);
  }

  // @box Bounds with pixels from t,l corner of map area.
  function zoomToBox(box) {
    var pct = Math.max(box.width() / ext.width(), box.height() / ext.height()),
        fx = box.centerX() / ext.width() * (1 + pct) - pct / 2,
        fy = box.centerY() / ext.height() * (1 + pct) - pct / 2;
    zoomByPct(1 / pct, fx, fy);
  }

  // @pct Change in scale (2 = 2x zoom)
  // @fx, @fy zoom focus, [0, 1]
  function zoomByPct(pct, fx, fy) {
    _fx = fx;
    _fy = fy;
    zoomTween.start(ext.scale(), ext.scale() * pct, 400);
  }

}




function MapExtent(el) {
  var _position = new ElementPosition(el),
      _scale = 1,
      _cx,
      _cy,
      _contentBounds;

  _position.on('resize', function() {
    this.dispatchEvent('change');
    this.dispatchEvent('navigate');
    this.dispatchEvent('resize');
  }, this);

  this.reset = function(force) {
    this.recenter(_contentBounds.centerX(), _contentBounds.centerY(), 1, force);
  };

  this.recenter = function(cx, cy, scale, force) {
    if (!scale) scale = _scale;
    if (force || !(cx == _cx && cy == _cy && scale == _scale)) {
      _cx = cx;
      _cy = cy;
      _scale = scale;
      this.dispatchEvent('change');
      this.dispatchEvent('navigate');
    }
  };

  this.pan = function(xpix, ypix) {
    var t = this.getTransform();
    this.recenter(_cx - xpix / t.mx, _cy - ypix / t.my);
  };

  // Zoom to @scale (a multiple of the map's full scale)
  // @xpct, @ypct: optional focus, [0-1]...
  this.rescale = function(scale, xpct, ypct) {
    if (arguments.length < 3) {
      xpct = 0.5;
      ypct = 0.5;
    }
    var b = this.getBounds(),
        fx = b.xmin + xpct * b.width(),
        fy = b.ymax - ypct * b.height(),
        dx = b.centerX() - fx,
        dy = b.centerY() - fy,
        ds = _scale / scale,
        dx2 = dx * ds,
        dy2 = dy * ds,
        cx = fx + dx2,
        cy = fy + dy2;
    this.recenter(cx, cy, scale);
  };

  this.resize = _position.resize;
  this.width = _position.width;
  this.height = _position.height;
  this.position = _position.position;

  // get zoom factor (1 == full extent, 2 == 2x zoom, etc.)
  this.scale = function() {
    return _scale;
  };

  this.getPixelSize = function() {
    return 1 / this.getTransform().mx;
  };

  // Get params for converting geographic coords to pixel coords
  this.getTransform = function(pixScale) {
    // get transform (y-flipped);
    var viewBounds = new Bounds(0, 0, _position.width(), _position.height());
    if (pixScale) {
      viewBounds.xmax *= pixScale;
      viewBounds.ymax *= pixScale;
    }
    return this.getBounds().getTransform(viewBounds, true);
  };

  this.getBounds = function() {
    if (!_contentBounds) return new Bounds();
    return centerAlign(calcBounds(_cx, _cy, _scale));
  };

  // Update the extent of 'full' zoom without navigating the current view
  this.setBounds = function(b) {
    var prev = _contentBounds;
    _contentBounds = b;
    if (prev) {
      _scale = _scale * centerAlign(b).width() / centerAlign(prev).width();
    } else {
      _cx = b.centerX();
      _cy = b.centerY();
    }
  };

  function getPadding(size) {
    return size * 0.020 + 4;
  }

  function calcBounds(cx, cy, scale) {
    var w = _contentBounds.width() / scale,
        h = _contentBounds.height() / scale;
    return new Bounds(cx - w/2, cy - h/2, cx + w/2, cy + h/2);
  }

  // Receive: Geographic bounds of content to be centered in the map
  // Return: Geographic bounds of map window centered on @_contentBounds,
  //    with padding applied
  function centerAlign(_contentBounds) {
    var bounds = _contentBounds.clone(),
        wpix = _position.width(),
        hpix = _position.height(),
        xmarg = getPadding(wpix),
        ymarg = getPadding(hpix),
        xpad, ypad;
    wpix -= 2 * xmarg;
    hpix -= 2 * ymarg;
    if (wpix <= 0 || hpix <= 0) {
      return new Bounds(0, 0, 0, 0);
    }
    bounds.fillOut(wpix / hpix);
    xpad = bounds.width() / wpix * xmarg;
    ypad = bounds.height() / hpix * ymarg;
    bounds.padBounds(xpad, ypad, xpad, ypad);
    return bounds;
  }
}

utils.inherit(MapExtent, EventDispatcher);




function HitControl(ext, mouse) {
  var self = new EventDispatcher();
  var prevHits = [];
  var active = false;
  var tests = {
    polygon: polygonTest,
    polyline: polylineTest,
    point: pointTest
  };
  var coords = El('#coordinate-info').hide();
  var lyr, target, test;

  ext.on('change', function() {
    // shapes may change along with map scale
    target = lyr ? lyr.getDisplayLayer() : null;
  });

  self.setLayer = function(o) {
    lyr = o;
    target = o.getDisplayLayer();
    test = tests[target.layer.geometry_type];
    coords.hide();
  };

  self.start = function() {
    active = true;
  };

  self.stop = function() {
    if (active) {
      hover([]);
      coords.text('').hide();
      active = false;
    }
  };

  mouse.on('click', function(e) {
    if (!active || !target) return;
    trigger('click', prevHits);
    gui.selectElement(coords.node());
  });

  // DISABLING: This causes problems when hovering over the info panel
  // Deselect hover shape when pointer leaves hover area
  //mouse.on('leave', function(e) {
  // hover(-1);
  //});

  mouse.on('hover', function(e) {
    var p, decimals;
    if (!active || !target) return;
    p = ext.getTransform().invert().transform(e.x, e.y);
    if (target.geographic) {
      // update coordinate readout if displaying geographic shapes
      decimals = getCoordPrecision(ext.getBounds());
      coords.text(p[0].toFixed(decimals) + ', ' + p[1].toFixed(decimals)).show();
    }
    if (test && e.hover) {
      hover(test(p[0], p[1]));
    }
  });

  // Convert pixel distance to distance in coordinate units.
  function getHitBuffer(pix) {
    var dist = pix / ext.getTransform().mx,
        scale = ext.scale();
    if (scale < 1) dist *= scale; // reduce hit threshold when zoomed out
    return dist;
  }

  function getCoordPrecision(bounds) {
    var min = Math.min(Math.abs(bounds.xmax), Math.abs(bounds.ymax)),
        decimals = Math.ceil(Math.log(min) / Math.LN10);
    return Math.max(0, 7 - decimals);
  }

  function polygonTest(x, y) {
    var dist = getHitBuffer(5),
        cands = findHitCandidates(x, y, dist),
        hits = [],
        cand, hitId;
    for (var i=0; i<cands.length; i++) {
      cand = cands[i];
      if (geom.testPointInPolygon(x, y, cand.shape, target.dataset.arcs)) {
        hits.push(cand.id);
      }
    }
    if (cands.length > 0 && hits.length === 0) {
      // secondary detection: proximity, if not inside a polygon
      hits = findNearestCandidates(x, y, dist, cands, target.dataset.arcs);
    }
    return hits;
  }

  function polylineTest(x, y) {
    var dist = getHitBuffer(15),
        cands = findHitCandidates(x, y, dist);
    return findNearestCandidates(x, y, dist, cands, target.dataset.arcs);
  }

  function findNearestCandidates(x, y, dist, cands, arcs) {
    var hits = [],
        cand, candDist;
    for (var i=0; i<cands.length; i++) {
      cand = cands[i];
      candDist = geom.getPointToShapeDistance(x, y, cand.shape, arcs);
      if (candDist < dist) {
        hits = [cand.id];
        dist = candDist;
      } else if (candDist == dist) {
        hits.push(cand.id);
      }
    }
    return hits;
  }

  function pointTest(x, y) {
    var dist = getHitBuffer(25),
        limitSq = dist * dist,
        hits = [];
    MapShaper.forEachPoint(target.layer.shapes, function(p, id) {
      var distSq = geom.distanceSq(x, y, p[0], p[1]);
      if (distSq < limitSq) {
        hits = [id];
        limitSq = distSq;
      } else if (distSq == limitSq) {
        hits.push(id);
      }
    });
    return hits;
  }

  function getProperties(id) {
    return target.layer.data ? target.layer.data.getRecordAt(id) : {};
  }

  function sameIds(a, b) {
    if (a.length != b.length) return false;
    for (var i=0; i<a.length; i++) {
      if (a[i] !== b[i]) return false;
    }
    return true;
  }

  function trigger(event, hits) {
    self.dispatchEvent(event, {
      ids: hits,
      id: hits.length > 0 ? hits[0] : -1
    });
  }

  function hover(hits) {
    if (!sameIds(hits, prevHits)) {
      prevHits = hits;
      El('#map-layers').classed('hover', hits.length > 0);
      trigger('hover', hits);
    }
  }

  function findHitCandidates(x, y, dist) {
    var arcs = target.dataset.arcs,
        index = {},
        cands = [],
        bbox = [];
    target.layer.shapes.forEach(function(shp, shpId) {
      var cand;
      for (var i = 0, n = shp && shp.length; i < n; i++) {
        arcs.getSimpleShapeBounds2(shp[i], bbox);
        if (x + dist < bbox[0] || x - dist > bbox[2] ||
          y + dist < bbox[1] || y - dist > bbox[3]) {
          continue; // bbox non-intersection
        }
        cand = index[shpId];
        if (!cand) {
          cand = index[shpId] = {shape: [], id: shpId};
          cands.push(cand);
        }
        cand.shape.push(shp[i]);
      }
    });
    return cands;
  }

  return self;
}





function Popup() {
  var parent = El('#mshp-main-map');
  var el = El('div').addClass('popup').appendTo(parent).hide();
  // var head = El('div').addClass('popup-head').appendTo(el).text('Feature 1 of 5  next prev');
  var content = El('div').addClass('popup-content').appendTo(el);

  this.show = function(rec, table, editable) {
    var maxHeight = parent.node().clientHeight - 36;
    this.hide(); // clean up if panel is already open
    render(content, rec, table, editable);
    el.show();
    if (content.node().clientHeight > maxHeight) {
      content.css('height:' + maxHeight + 'px');
    }
  };

  this.hide = function() {
    // make sure any pending edits are made before re-rendering popup
    // TODO: only blur popup fields
    gui.blurActiveElement();
    content.empty();
    content.node().removeAttribute('style'); // remove inline height
    el.hide();
  };

  function render(el, rec, table, editable) {
    var tableEl = El('table').addClass('selectable'),
        rows = 0;
    utils.forEachProperty(rec, function(v, k) {
      var type = MapShaper.getFieldType(v, k, table);
      renderRow(tableEl, rec, k, type, editable);
      rows++;
    });
    if (rows > 0) {
      tableEl.appendTo(el);
    } else {
      el.html('<div class="note">This layer is missing attribute data.</div>');
    }
  }

  function renderRow(table, rec, key, type, editable) {
    var rowHtml = '<td class="field-name">%s</td><td><span class="value">%s</span> </td>';
    var val = rec[key];
    var cell = El('tr')
        .appendTo(table)
        .html(utils.format(rowHtml, key, utils.htmlEscape(val)))
        .findChild('.value');
    setFieldClass(cell, val, type);
    if (editable) {
      editItem(cell, rec, key, type);
    }
  }

  function setFieldClass(el, val, type) {
    var isNum = type ? type == 'number' : utils.isNumber(val);
    var isNully = val === undefined || val === null || val !== val;
    var isEmpty = val === '';
    el.classed('num-field', isNum);
    el.classed('null-value', isNully);
    el.classed('empty', isEmpty);
  }

  function editItem(el, rec, key, type) {
    var input = new ClickText2(el),
        strval = String(rec[key]),
        parser = MapShaper.getInputParser(type);
    el.parent().addClass('editable-cell');
    el.addClass('colored-text dot-underline');
    input.on('change', function(e) {
      var val2 = parser(input.value()),
          strval2 = String(val2);
      if (strval == strval2) {
        // contents unchanged
      } else if (val2 === null) {
        // invalid value; revert to previous value
        input.value(strval);
      } else {
        // field content has changed;
        strval = strval2;
        rec[key] = val2;
        input.value(strval);
        setFieldClass(el, val2, type);
      }
    });
  }
}

MapShaper.inputParsers = {
  string: function(raw) {
    return raw;
  },
  number: function(raw) {
    var val = Number(raw);
    if (raw == 'NaN') {
      val = NaN;
    } else if (isNaN(val)) {
      val = null;
    }
    return val;
  },
  boolean: function(raw) {
    var val = null;
    if (raw == 'true') {
      val = true;
    } else if (raw == 'false') {
      val = false;
    }
    return val;
  },
  multiple: function(raw) {
    var val = Number(raw);
    return isNaN(val) ? raw : val;
  }
};

MapShaper.getInputParser = function(type) {
  return MapShaper.inputParsers[type || 'multiple'];
};

MapShaper.getValueType = function(val) {
  var type = null;
  if (utils.isString(val)) {
    type = 'string';
  } else if (utils.isNumber(val)) {
    type = 'number';
  } else if (utils.isBoolean(val)) {
    type = 'boolean';
  }
  return type;
};

MapShaper.getColumnType = function(key, table) {
  var records = table.getRecords(),
      type = null;
  for (var i=0, n=records.length; i<n; i++) {
    type = MapShaper.getValueType(records[i][key]);
    if (type) break;
  }
  return type;
};

MapShaper.getFieldType = function(val, key, table) {
  // if a field has a null value, look at entire column to identify type
  return MapShaper.getValueType(val) || MapShaper.getColumnType(key, table);
};




function InspectionControl(model, hit) {
  var _popup = new Popup();
  var _inspecting = false;
  var _pinned = false;
  var _highId = -1;
  var _selectionIds = null;
  var btn = gui.addSidebarButton("#info-icon2").on('click', function() {
    if (_inspecting) turnOff(); else turnOn();
  });
  var _self = new EventDispatcher();
  var _shapes, _lyr;

  _self.updateLayer = function(o) {
    var shapes = o.getDisplayLayer().layer.shapes;
    if (_inspecting) {
      // kludge: check if shapes have changed
      if (_shapes == shapes) {
        // kludge: re-display the inspector, in case data changed
        inspect(_highId, _pinned);
      } else {
        _selectionIds = null;
        inspect(-1, false);
      }
    }
    hit.setLayer(o);
    _shapes = shapes;
    _lyr = o;
  };

  // replace cli inspect command
  api.inspect = function(lyr, arcs, opts) {
    var ids;
    if (lyr != model.getEditingLayer().layer) {
      error("Only the active layer can be targeted");
    }
    ids = MapShaper.selectFeatures(lyr, arcs, opts);
    if (ids.length === 0) {
      message("No features were selected");
      return;
    }
    _selectionIds = ids;
    turnOn();
    inspect(ids[0], true);
  };

  document.addEventListener('keydown', function(e) {
    var kc = e.keyCode, n, id;
    if (!_inspecting) return;

    // esc key closes (unless in an editing mode)
    if (e.keyCode == 27 && _inspecting && !model.getMode()) {
      turnOff();

    // arrow keys advance pinned feature unless user is editing text.
    } else if ((kc == 37 || kc == 39) && _pinned && !gui.getInputElement()) {
      n = MapShaper.getFeatureCount(_lyr.getDisplayLayer().layer);
      if (n > 1) {
        if (kc == 37) {
          id = (_highId + n - 1) % n;
        } else {
          id = (_highId + 1) % n;
        }
        inspect(id, true);
        e.stopPropagation();
      }
    }
  }, !!'capture'); // preempt the layer control's arrow key handler

  hit.on('click', function(e) {
    var id = e.id;
    var pin = false;
    if (_pinned && id == _highId) {
      // clicking on pinned shape: unpin
    } else if (!_pinned && id > -1) {
      // clicking on unpinned shape while unpinned: pin
      pin = true;
    } else if (_pinned && id > -1) {
      // clicking on unpinned shape while pinned: pin new shape
      pin = true;
    } else if (!_pinned && id == -1) {
      // clicking off the layer while pinned: unpin and deselect
    }
    inspect(id, pin, e.ids);
  });

  hit.on('hover', function(e) {
    var id = e.id;
    if (!_inspecting || _pinned) return;
    inspect(id, false, e.ids);
  });

  function showInspector(id, editable) {
    var o = _lyr.getDisplayLayer();
    var table = o.layer.data || null;
    var rec = table ? table.getRecordAt(id) : {};
    _popup.show(rec, table, editable);
  }

  // @id Id of a feature in the active layer, or -1
  function inspect(id, pin, ids) {
    if (!_inspecting) return;
    if (id > -1) {
      showInspector(id, pin);
    } else {
      _popup.hide();
    }
    _highId = id;
    _pinned = pin;
    _self.dispatchEvent('change', {
      selection_ids: _selectionIds || [],
      hover_ids: ids || [],
      id: id,
      pinned: pin
    });
  }

  function turnOn() {
    btn.addClass('selected');
    _inspecting = true;
    hit.start();
  }

  function turnOff() {
    btn.removeClass('selected');
    hit.stop();
    _selectionIds = null;
    inspect(-1); // clear the map
    _inspecting = false;
  }

  return _self;
}




var MapStyle = (function() {
  var darkStroke = "#334",
      lightStroke = "#b2d83a",
      pink = "#f74b80",  // dark
      pink2 = "rgba(239, 0, 86, 0.16)", // "#ffd9e7", // medium
      gold = "#efc100",
      black = "black",
      selectionFill = "rgba(237, 214, 0, 0.12)",
      hoverFill = "rgba(255, 117, 165, 0.18)",
      outlineStyle = {
        type: 'outline',
        strokeColors: [lightStroke, darkStroke],
        strokeWidth: 0.7,
        dotColor: "#223"
      },
      highStyle = {
        dotColor: "#F24400"
      },
      hoverStyles = {
        polygon: {
          fillColor: hoverFill,
          strokeColor: black,
          strokeWidth: 1.2
        }, point:  {
          dotColor: black,
          dotSize: 8
        }, polyline:  {
          strokeColor: black,
          strokeWidth: 2.5
        }
      },
      selectionStyles = {
        polygon: {
          fillColor: selectionFill,
          strokeColor: gold,
          strokeWidth: 1
        }, point:  {
          dotColor: gold,
          dotSize: 6
        }, polyline:  {
          strokeColor: gold,
          strokeWidth: 1.8
        }
      },
      selectionHoverStyles = {
        polygon: {
          fillColor: selectionFill,
          strokeColor: black,
          strokeWidth: 1.2
        }, point:  {
          dotColor: black,
          dotSize: 6
        }, polyline:  {
          strokeColor: black,
          strokeWidth: 2.5
        }
      },
      pinnedStyles = {
        polygon: {
          fillColor: pink2,
          strokeColor: pink,
          strokeWidth: 1.8
        }, point:  {
          dotColor: pink,
          dotSize: 8
        }, polyline:  {
          strokeColor: pink,
          strokeWidth: 3
        }
      };

  return {
    getHighlightStyle: function() {
      return highStyle;
    },
    getActiveStyle: function(lyr) {
      var style;
      if (MapShaper.layerHasSvgDisplayStyle(lyr)) {
        style = MapShaper.getSvgDisplayStyle(lyr);
      } else {
        style = utils.extend({}, outlineStyle);
        style.dotSize = calcDotSize(MapShaper.countPointsInLayer(lyr));
      }
      return style;
    },
    getOverlayStyle: getOverlayStyle
  };

  function calcDotSize(n) {
    return n < 20 && 5 || n < 500 && 4 || n < 50000 && 3 || 2;
  }

  function getOverlayStyle(lyr, o) {
    var type = lyr.geometry_type;
    var topId = o.id;
    var ids = [];
    var styles = [];
    var styler = function(o, i) {
      utils.extend(o, styles[i]);
    };
    var overlayStyle = {
      styler: styler
    };
    // first layer: selected feature(s)
    o.selection_ids.forEach(function(i) {
      // skip features in a higher layer
      if (i == topId || o.hover_ids.indexOf(i) > -1) return;
      ids.push(i);
      styles.push(selectionStyles[type]);
    });
    // second layer: hover feature(s)
    o.hover_ids.forEach(function(i) {
      var style;
      if (i == topId) return;
      style = o.selection_ids.indexOf(i) > -1 ? selectionHoverStyles[type] : hoverStyles[type];
      ids.push(i);
      styles.push(style);
    });
    // top layer: highlighted feature
    if (topId > -1) {
      var isPinned = o.pinned;
      var inSelection = o.selection_ids.indexOf(topId) > -1;
      var style;
      if (isPinned) {
        style = pinnedStyles[type];
      } else if (inSelection) {
        style = selectionHoverStyles[type]; // TODO: differentiate from other hover ids
      } else {
        style = hoverStyles[type]; // TODO: differentiate from other hover ids
      }
      ids.push(topId);
      styles.push(style);
    }

    if (MapShaper.layerHasSvgDisplayStyle(lyr)) {
      if (type == 'point') {
        overlayStyle = MapShaper.wrapHoverStyle(MapShaper.getSvgDisplayStyle(lyr), overlayStyle);
      }
      overlayStyle.type = 'styled';
    }
    overlayStyle.ids = ids;
    return ids.length > 0 ? overlayStyle : null;
  }

}());

// Modify style to use scaled circle instead of dot symbol
MapShaper.wrapHoverStyle = function(style, hoverStyle) {
  var styler = function(obj, i) {
    var dotColor;
    style.styler(obj, i);
    if (hoverStyle.styler) {
      hoverStyle.styler(obj, i);
    }
    dotColor = obj.dotColor;
    if (obj.radius && dotColor) {
      obj.radius += 1.5;
      obj.fillColor = dotColor;
      obj.strokeColor = dotColor;
      obj.opacity = 1;
    }
  };
  return {styler: styler};
};

MapShaper.getSvgDisplayStyle = function(lyr) {
  var records = lyr.data.getRecords(),
      fields = MapShaper.getSvgStyleFields(lyr),
      index = MapShaper.svgStyles;
  var styler = function(style, i) {
    var f, key, val;
    for (var j=0; j<fields.length; j++) {
      f = fields[j];
      key = index[f];
      val = records[i][f];
      if (val == 'none') {
        val = 'transparent'; // canvas equivalent
      }
      style[key] = val;
    }

    // TODO: make sure canvas rendering matches svg output
    if (('strokeWidth' in style) && !style.strokeColor) {
      style.strokeColor = 'black';
    } else if (!('strokeWidth' in style) && style.strokeColor) {
      style.strokeWidth = 1;
    }
    if (('radius' in style) && !style.strokeColor && !style.fillColor &&
      lyr.geometry_type == 'point') {
      style.fillColor = 'black';
    }
  };
  return {styler: styler, type: 'styled'};
};




MapShaper.getBoundsOverlap = function(bb1, bb2) {
  var area = 0;
  if (bb1.intersects(bb2)) {
    area = (Math.min(bb1.xmax, bb2.xmax) - Math.max(bb1.xmin, bb2.xmin)) *
      (Math.min(bb1.ymax, bb2.ymax) - Math.max(bb1.ymin, bb2.ymin));
  }
  return area;
};

// Test if map should be re-framed to show updated layer
gui.mapNeedsReset = function(newBounds, prevBounds, mapBounds) {
  if (!prevBounds) return true;
  if (prevBounds.xmin === 0 || newBounds.xmin === 0) return true; // kludge to handle tables
  // TODO: consider similarity of prev and next bounds
  //var overlapPct = 2 * MapShaper.getBoundsOverlap(newBounds, prevBounds) /
  //    (newBounds.area() + prevBounds.area());
  var boundsChanged = !prevBounds.equals(newBounds);
  var intersects = newBounds.intersects(mapBounds);
  // TODO: compare only intersecting portion of layer with map bounds
  var areaRatio = newBounds.area() / mapBounds.area();
  if (!boundsChanged) return false; // don't reset if layer extent hasn't changed
  if (!intersects) return true; // reset if layer is out-of-view
  return areaRatio > 500 || areaRatio < 0.05; // reset if layer is not at a viewable scale
};

function MshpMap(model) {
  var _root = El('#mshp-main-map'),
      _layers = El('#map-layers'),
      _ext = new MapExtent(_layers),
      _mouse = new MouseArea(_layers.node()),
      _nav = new MapNav(_root, _ext, _mouse),
      _inspector = new InspectionControl(model, new HitControl(_ext, _mouse));

  var _activeCanv = new DisplayCanvas().appendTo(_layers), // data layer shapes
      _overlayCanv = new DisplayCanvas().appendTo(_layers), // hover and selection shapes
      _annotationCanv = new DisplayCanvas().appendTo(_layers), // used for line intersections
      _annotationLyr, _annotationStyle,
      _activeLyr, _activeStyle, _overlayStyle;

  _ext.on('change', drawLayers);

  _inspector.on('change', function(e) {
    var lyr = _activeLyr.getDisplayLayer().layer;
    _overlayStyle = MapStyle.getOverlayStyle(lyr, e);
    drawLayer(_activeLyr, _overlayCanv, _overlayStyle);
  });

  model.on('select', function(e) {
    _annotationStyle = null;
    _overlayStyle = null;
  });

  model.on('update', function(e) {
    var prevBounds = _activeLyr ?_activeLyr.getBounds() : null,
        needReset = false;

    if (arcsMayHaveChanged(e.flags)) {
      // regenerate filtered arcs when simplification thresholds are calculated
      // or arcs are updated
      delete e.dataset.filteredArcs;

      // reset simplification after projection (thresholds have changed)
      // TODO: preserve simplification pct (need to record pct before change)
      if (e.flags.proj && e.dataset.arcs) {
        e.dataset.arcs.setRetainedPct(1);
      }
    }

    _activeLyr = initActiveLayer(e);
    needReset = gui.mapNeedsReset(_activeLyr.getBounds(), prevBounds, _ext.getBounds());
    _ext.setBounds(_activeLyr.getBounds()); // update map extent to match bounds of active group
    if (needReset) {
      // zoom to full view of the active layer and redraw
      _ext.reset(true);
    } else {
      // refresh without navigating
      drawLayers();
    }
  });

  this.setHighlightLayer = function(lyr, dataset) {
    if (lyr) {
      _annotationLyr = new DisplayLayer(lyr, dataset, _ext);
      _annotationStyle = MapStyle.getHighlightStyle();
      drawLayer(_annotationLyr, _annotationCanv, _annotationStyle);
    } else {
      _annotationStyle = null;
      _annotationLyr = null;
    }
  };

  // lightweight way to update simplification of display lines
  // TODO: consider handling this as a model update
  this.setSimplifyPct = function(pct) {
    _activeLyr.setRetainedPct(pct);
    drawLayers();
  };

  function initActiveLayer(o) {
    var lyr = new DisplayLayer(o.layer, o.dataset, _ext);
    _inspector.updateLayer(lyr);
    _activeStyle = MapStyle.getActiveStyle(lyr.getDisplayLayer().layer);
    lyr.updateStyle(_activeStyle);
    return lyr;
  }

  // Test if an update may have affected the visible shape of arcs
  // @flags Flags from update event
  function arcsMayHaveChanged(flags) {
    return flags.presimplify || flags.simplify || flags.proj ||
        flags.arc_count || flags.repair;
  }

  function drawLayers() {
    drawLayer(_activeLyr, _overlayCanv, _overlayStyle);
    drawLayer(_activeLyr, _activeCanv, _activeStyle);
    drawLayer(_annotationLyr, _annotationCanv, _annotationStyle);
  }

  function drawLayer(lyr, canv, style) {
    if (style) {
      canv.prep(_ext);
      lyr.draw(canv, style);
    } else {
      canv.hide();
    }

  }
}

utils.inherit(MshpMap, EventDispatcher);




function Console(model) {
  var CURSOR = '$ ';
  var PROMPT = 'Enter mapshaper commands or type "tips" for examples and console help';
  var el = El('#console').hide();
  var content = El('#console-buffer');
  var log = El('div').id('console-log').appendTo(content);
  var line = El('div').id('command-line').appendTo(content).text(CURSOR);
  var input = El('span').appendTo(line)
    .addClass('input-field')
    .attr('spellcheck', false)
    .attr('autocorrect', false)
    .attr('contentEditable', true)
    .on('focus', receiveFocus)
    .on('paste', onPaste);
  var history = [];
  var historyId = 0;
  var _isOpen = false;
  var _error = MapShaper.error; // save default error functions...
  var _stop = MapShaper.stop;

  // capture all messages to this console, whether open or closed
  message = MapShaper.message = consoleMessage;

  message(PROMPT);
  document.addEventListener('keydown', onKeyDown);
  new ModeButton('#console-btn', 'console', model);
  model.addMode('console', turnOn, turnOff);

  gui.onClick(content, function(e) {
    var targ = El(e.target);
    if (gui.getInputElement() || targ.hasClass('console-message')) {
      // don't focus if user is typing or user clicks content area
    } else {
      input.node().focus();
    }
  });

  function toLog(str, cname) {
    var msg = El('div').text(str).appendTo(log);
    if (cname) {
      msg.addClass(cname);
    }
    scrollDown();
  }

  function turnOn() {
    if (!_isOpen && !!model.getEditingLayer()) {
      _isOpen = true;
      stop = MapShaper.stop = consoleStop;
      error = MapShaper.error = consoleError;
      el.show();
      input.node().focus();
    }
  }

  function turnOff() {
    if (_isOpen) {
      _isOpen = false;
      stop = MapShaper.stop = _stop; // restore original error functions
      error = MapShaper.error = _error;
      el.hide();
      input.node().blur();
    }
  }

  function onPaste(e) {
    // paste plain text (remove any copied HTML tags)
    e.preventDefault();
    var str = (e.originalEvent || e).clipboardData.getData('text/plain');
    document.execCommand("insertHTML", false, str);
  }

  function receiveFocus() {
    placeCursor();
  }

  function placeCursor() {
    var el = input.node();
    var range, selection;
    if (readCommandLine().length > 0) {
      // move cursor to end of text
      range = document.createRange();
      range.selectNodeContents(el);
      range.collapse(false); //collapse the range to the end point.
      selection = window.getSelection();
      selection.removeAllRanges();
      selection.addRange(range);
    }
  }

  function scrollDown() {
    var el = content.parent().node();
    el.scrollTop = el.scrollHeight;
  }

  function metaKey(e) {
    return e.metaKey || e.ctrlKey || e.altKey;
  }

  function onKeyDown(e) {
    var kc = e.keyCode,
        inputEl = gui.getInputElement(),
        typing = !!inputEl,
        typingInConsole = inputEl && inputEl == input.node(),
        inputText = readCommandLine(),
        capture = false;

    // esc key
    if (kc == 27) {
      if (typing) {
        inputEl.blur();
      }
      model.clearMode(); // esc escapes other modes as well
      capture = true;

    // l/r arrow keys while not typing in a text field
    } else if ((kc == 37 || kc == 39) && (!typing || typingInConsole && !inputText)) {
      if (kc == 37) {
        model.selectPrevLayer();
      } else {
        model.selectNextLayer();
      }

    // delete key while not inputting text
    } else if (kc == 8 && !typing) {
      capture = true; // prevent delete from leaving page

    // any key while console is open
    } else if (_isOpen) {
      capture = true;
      if (kc == 13) { // enter
        submit();
      } else if (kc == 9) { // tab
        tabComplete();
      } else if (kc == 38) {
        back();
      } else if (kc == 40) {
        forward();
      } else if (kc == 32 && (!typing || (inputText === '' && typingInConsole))) {
        // space bar closes if nothing has been typed
        model.clearMode();
      } else if (!typing && e.target != input.node() && !metaKey(e)) {
        // typing returns focus, unless a meta key is down (to allow Cmd-C copy)
        // or user is typing in a different input area somewhere
        input.node().focus();
        capture = false;
      } else {
        // normal typing
        capture = false;
      }

    // space bar while not inputting text
    } else if (!typing && kc == 32) {
      // space bar opens console, unless typing in an input field or editable el
      capture = true;
      model.enterMode('console');
    }

    if (capture) {
      e.preventDefault();
    }
  }

  // tab-completion for field names
  function tabComplete() {
    var line = readCommandLine(),
        match = /\w+$/.exec(line),
        stub = match ? match[0] : '',
        lyr = model.getEditingLayer().layer,
        names, name;
    if (stub && lyr.data) {
      names = findCompletions(stub, lyr.data.getFields());
      if (names.length > 0) {
        name = utils.getCommonFileBase(names);
        if (name.length > stub.length) {
          toCommandLine(line.substring(0, match.index) + name);
        }
      }
    }
  }

  function findCompletions(str, fields) {
    return fields.filter(function(name) {
      return name.indexOf(str) === 0;
    });
  }

  function readCommandLine() {
    return input.node().textContent.trim();
  }

  function toCommandLine(str) {
    input.node().textContent = str.trim();
    placeCursor();
  }

  function peekHistory(i) {
    var idx = history.length - 1 - (i || 0);
    return idx >= 0 ? history[idx] : null;
  }

  function toHistory(str) {
    if (historyId > 0) { // if we're back in the history stack
      if (peekHistory() === '') {
        // remove empty string (which may have been appended when user started going back)
        history.pop();
      }
      historyId = 0; // move back to the top of the stack
    }
    if (str && str != peekHistory()) {
      history.push(str);
    }
  }

  function fromHistory() {
    toCommandLine(peekHistory(historyId));
  }

  function back() {
    if (history.length === 0) return;
    if (historyId === 0) {
      history.push(readCommandLine());
    }
    historyId = Math.min(history.length - 1, historyId + 1);
    fromHistory();
  }

  function forward() {
    if (historyId <= 0) return;
    historyId--;
    fromHistory();
    if (historyId === 0) {
      history.pop();
    }
  }

  function clear() {
    log.empty();
    scrollDown();
  }

  function getCommandFlags(commands) {
    return commands.reduce(function(memo, cmd) {
      memo[cmd.name] = true;
      return memo;
    }, {});
  }

  function submit() {
    var cmd = readCommandLine();
    toCommandLine('');
    toLog(CURSOR + cmd);
    if (cmd) {
      if (cmd == 'clear') {
        clear();
      } else if (cmd == 'tips') {
        printExamples();
      } else if (cmd == 'layers') {
        message("Available layers:",
          MapShaper.getFormattedLayerList(model.getEditingLayer().dataset.layers));
      } else if (cmd == 'close' || cmd == 'exit' || cmd == 'quit') {
        model.clearMode();
      } else if (cmd) {
        runMapshaperCommands(cmd);
      }
      toHistory(cmd);
    }
  }

  function runMapshaperCommands(str) {
    var commands, target;
    try {
      commands = MapShaper.parseConsoleCommands(str);
      commands = MapShaper.runAndRemoveInfoCommands(commands);
      target = model.getEditingLayer();
    } catch (e) {
      return onError(e);
    }
    if (target.layer && commands.length > 0) {
      applyParsedCommands(commands, target.layer, target.dataset);
    }
  }

  function applyParsedCommands(commands, lyr, dataset) {
    var lyrId = dataset.layers.indexOf(lyr),
        prevArcCount = dataset.arcs ? dataset.arcs.size() : 0;

    // most commands should target the currently edited layer unless
    // user has specified a different target
    commands.forEach(function(cmd) {
      if (!cmd.options.target && cmd.name != 'rename-layers' &&
          cmd.name != 'merge-layers') {
        cmd.options.target = String(lyrId);
      }
    });

    MapShaper.runParsedCommands(commands, dataset, function(err) {
      var flags = getCommandFlags(commands),
          outputLyr = getOutputLayer(lyrId, dataset, commands);
      if (prevArcCount > 0 && dataset.arcs.size() != prevArcCount) {
        // kludge to signal map that filtered arcs need refreshing
        flags.arc_count = true;
      }
      model.updated(flags, outputLyr, dataset);
      // signal the map to update even if an error has occured, because the
      // commands may have partially succeeded and changes may have occured to
      // the data.
      if (err) onError(err);
    });
  }

  // try to get the output layer from the last console command
  // (if multiple layers are output, pick one of the output layers)
  // @lyrId  index of the currently edited layer
  function getOutputLayer(lyrId, dataset, commands) {
    var lastCmd = commands[commands.length-1],
        layers = dataset.layers,
        lyr;
    if (lastCmd.options.no_replace) {
      // pick last layer if a new layer has been created
      // (new layers should be appended to the list of layers -- need to test)
      lyr = layers[layers.length-1];
    } else {
      // use the layer in the same position as the currently selected layer;
      // this may not be the output layer if a different layer was explicitly
      // targeted.
      lyr = layers[lyrId] || layers[0];
    }
    return lyr;
  }

  function onError(err) {
    if (utils.isString(err)) {
      stop(err);
    } else if (err.name == 'APIError') {
      // stop() has already been called, don't need to log
    } else if (err.name) {
      // log stack trace to browser console
      console.error(err.stack);
      // log to console window
      warning(err.message);
    }
  }

  function consoleStop() {
    var msg = gui.formatMessageArgs(arguments);
    warning(msg);
    throw new APIError(msg);
  }

  function warning() {
    var msg = gui.formatMessageArgs(arguments);
    toLog(msg, 'console-error');
  }

  function consoleMessage() {
    var msg = gui.formatMessageArgs(arguments);
    toLog(msg, 'console-message');
  }

  function consoleError() {
    var msg = gui.formatMessageArgs(arguments);
    throw new Error(msg);
  }

  function printExample(comment, command) {
    toLog(comment, 'console-message');
    toLog(command, 'console-example');
  }

  function printExamples() {
    printExample("See a list of all console commands", "$ help");
    printExample("Get help using a single command", "$ help innerlines");
    printExample("Get information about the active data layer", "$ info");
    printExample("Delete one state from a national dataset","$ filter 'STATE != \"Alaska\"'");
    printExample("Aggregate counties to states by dissolving shared edges" ,"$ dissolve 'STATE'");
    printExample("Clear the console", "$ clear");
  }
}




function Model() {
  var datasets = [],
      self = this,
      mode = null,
      editing;

  this.forEachLayer = function(cb) {
    var i = 0;
    datasets.forEach(function(dataset) {
      dataset.layers.forEach(function(lyr) {
        cb(lyr, dataset, i++);
      });
    });
  };

  this.deleteLayer = function(lyr, dataset) {
    var layers = dataset.layers;
    layers.splice(layers.indexOf(lyr), 1);
    if (layers.length === 0) {
      this.removeDataset(dataset);
    }
  };

  this.findLayer = function(target) {
    var found = null;
    this.forEachLayer(function(lyr, dataset) {
      if (lyr == target) {
        found = layerObject(lyr, dataset);
      }
    });
    return found;
  };

  this.findAnotherLayer = function(target) {
    var layers = this.getLayers(),
        found = null;
    if (layers.length > 1) {
      found = layers[0].layer == target ? layers[1] : layers[0];
    }
    return found;
  };

  this.removeDataset = function(target) {
    if (target == (editing && editing.dataset)) {
      error("Can't remove dataset while editing");
    }
    datasets = datasets.filter(function(d) {
      return d != target;
    });
  };

  this.getDatasets = function() {
    return datasets;
  };

  this.getLayers = function() {
    var layers = [];
    this.forEachLayer(function(lyr, dataset) {
      layers.push(layerObject(lyr, dataset));
    });
    return layers;
  };

  this.selectNextLayer = function() {
    var layers = this.getLayers(),
        idx = indexOfLayer(editing.layer, layers),
        next;
    if (layers.length > 1 && idx > -1) {
      next = layers[(idx + 1) % layers.length];
      this.selectLayer(next.layer, next.dataset);
    }
  };

  this.selectPrevLayer = function() {
    var layers = this.getLayers(),
        idx = indexOfLayer(editing.layer, layers),
        prev;
    if (layers.length > 1 && idx > -1) {
      prev = layers[idx === 0 ? layers.length - 1 : idx - 1];
      this.selectLayer(prev.layer, prev.dataset);
    }
  };

  this.selectLayer = function(lyr, dataset) {
    this.updated({select: true}, lyr, dataset);
  };

  this.addDataset = function(dataset) {
    this.updated({select: true, import: true}, dataset.layers[0], dataset);
  };

  this.updated = function(flags, lyr, dataset) {
    var e;
    flags = flags || {};
    if (lyr && dataset && (!editing || editing.layer != lyr)) {
      setEditingLayer(lyr, dataset);
      flags.select = true;
    }
    if (editing) {
      if (flags.select) {
        this.dispatchEvent('select', editing);
      }
      e = utils.extend({flags: flags}, editing);
      this.dispatchEvent('update', e);
    }
  };

  this.getEditingLayer = function() {
    return editing || {};
  };

  this.getMode = function() {
    return mode;
  };

  // return a function to trigger this mode
  this.addMode = function(name, enter, exit) {
    this.on('mode', function(e) {
      if (e.prev == name) {
        exit();
      }
      if (e.name == name) {
        enter();
      }
    });
  };

  this.addMode(null, function() {}, function() {}); // null mode

  this.clearMode = function() {
    self.enterMode(null);
  };

  this.enterMode = function(next) {
    var prev = mode;
    if (next != prev) {
      mode = next;
      self.dispatchEvent('mode', {name: next, prev: prev});
    }
  };

  function setEditingLayer(lyr, dataset) {
    if (editing && editing.layer == lyr) {
      return;
    }
    if (dataset.layers.indexOf(lyr) == -1) {
      error("Selected layer not found");
    }
    if (datasets.indexOf(dataset) == -1) {
      datasets.push(dataset);
    }
    editing = layerObject(lyr, dataset);
  }

  function layerObject(lyr, dataset) {
    return {
      layer: lyr,
      dataset: dataset
    };
  }

  function indexOfLayer(lyr, layers) {
    var idx = -1;
    layers.forEach(function(o, i) {
      if (o.layer == lyr) idx = i;
    });
    return idx;
  }
}

utils.inherit(Model, EventDispatcher);




Browser.onload(function() {
  if (!gui.browserIsSupported()) {
    El("#mshp-not-supported").show();
    return;
  }
  gui.startEditing();
  if (window.location.hostname == 'localhost') {
    window.addEventListener('beforeunload', function() {
      // send termination signal for mapshaper-gui
      var req = new XMLHttpRequest();
      req.open('GET', '/close');
      req.send();
    });
  }
});

gui.startEditing = function() {
  var model = new Model(),
      dataLoaded = false,
      map, repair, simplify;
  gui.startEditing = function() {};
  gui.alert = new ErrorMessages(model);
  map = new MshpMap(model);
  repair = new RepairControl(model, map);
  simplify = new SimplifyControl(model);
  new ImportFileProxy(model);
  new ImportControl(model);
  new ExportControl(model);
  new LayerControl(model);

  model.on('select', function() {
    if (!dataLoaded) {
      dataLoaded = true;
      El('#mode-buttons').show();
      El('#nav-buttons').show();
      new Console(model);
    }
  });
  // TODO: untangle dependencies between SimplifyControl, RepairControl and Map
  simplify.on('simplify-start', function() {
    repair.hide();
  });
  simplify.on('simplify-end', function() {
    repair.update();
  });
  simplify.on('change', function(e) {
    map.setSimplifyPct(e.value);
  });
};

}());


================================================
FILE: mapshaper.js
================================================
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
(function (Buffer){
(function(){
var VERSION = '0.3.25';

var error = function() {
  var msg = Utils.toArray(arguments).join(' ');
  throw new Error(msg);
};

var utils = {
  getUniqueName: function(prefix) {
    var n = Utils.__uniqcount || 0;
    Utils.__uniqcount = n + 1;
    return (prefix || "__id_") + n;
  },

  isFunction: function(obj) {
    return typeof obj == 'function';
  },

  isObject: function(obj) {
    return obj === Object(obj); // via underscore
  },

  clamp: function(val, min, max) {
    return val < min ? min : (val > max ? max : val);
  },

  interpolate: function(val1, val2, pct) {
    return val1 * (1-pct) + val2 * pct;
  },

  isArray: function(obj) {
    return Array.isArray(obj);
  },

  // NaN -> true
  isNumber: function(obj) {
    // return toString.call(obj) == '[object Number]'; // ie8 breaks?
    return obj != null && obj.constructor == Number;
  },

  isInteger: function(obj) {
    return Utils.isNumber(obj) && ((obj | 0) === obj);
  },

  isString: function(obj) {
    return obj != null && obj.toString === String.prototype.toString;
    // TODO: replace w/ something better.
  },

  isBoolean: function(obj) {
    return obj === true || obj === false;
  },

  // Convert an array-like object to an Array, or make a copy if @obj is an Array
  toArray: function(obj) {
    var arr;
    if (!Utils.isArrayLike(obj)) error("Utils.toArray() requires an array-like object");
    try {
      arr = Array.prototype.slice.call(obj, 0); // breaks in ie8
    } catch(e) {
      // support ie8
      arr = [];
      for (var i=0, n=obj.length; i<n; i++) {
        arr[i] = obj[i];
      }
    }
    return arr;
  },

  // Array like: has length property, is numerically indexed and mutable.
  // TODO: try to detect objects with length property but no indexed data elements
  isArrayLike: function(obj) {
    if (!obj) return false;
    if (Utils.isArray(obj)) return true;
    if (Utils.isString(obj)) return false;
    if (obj.length === 0) return true;
    if (obj.length > 0) return true;
    return false;
  },

  // See https://raw.github.com/kvz/phpjs/master/functions/strings/addslashes.js
  addslashes: function(str) {
    return (str + '').replace(/[\\"']/g, '\\$&').replace(/\u0000/g, '\\0');
  },

  // Escape a literal string to use in a regexp.
  // Ref.: http://simonwillison.net/2006/Jan/20/escape/
  regexEscape: function(str) {
    return str.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
  },

  defaults: function(dest) {
    for (var i=1, n=arguments.length; i<n; i++) {
      var src = arguments[i] || {};
      for (var key in src) {
        if (key in dest === false && src.hasOwnProperty(key)) {
          dest[key] = src[key];
        }
      }
    }
    return dest;
  },

  extend: function(o) {
    var dest = o || {},
        n = arguments.length,
        key, i, src;
    for (i=1; i<n; i++) {
      src = arguments[i] || {};
      for (key in src) {
        if (src.hasOwnProperty(key)) {
          dest[key] = src[key];
        }
      }
    }
    return dest;
  },

  // Pseudoclassical inheritance
  //
  // Inherit from a Parent function:
  //    Utils.inherit(Child, Parent);
  // Call parent's constructor (inside child constructor):
  //    this.__super__([args...]);
  inherit: function(targ, src) {
    var f = function() {
      if (this.__super__ == f) {
        // add __super__ of parent to front of lookup chain
        // so parent class constructor can call its parent using this.__super__
        this.__super__ = src.prototype.__super__;
        // call parent constructor function. this.__super__ now points to parent-of-parent
        src.apply(this, arguments);
        // remove temp __super__, expose targ.prototype.__super__ again
        delete this.__super__;
      }
    };

    f.prototype = src.prototype || src; // added || src to allow inheriting from objects as well as functions
    // Extend targ prototype instead of wiping it out --
    //   in case inherit() is called after targ.prototype = {stuff}; statement
    targ.prototype = Utils.extend(new f(), targ.prototype); //
    targ.prototype.constructor = targ;
    targ.prototype.__super__ = f;
  },

  // Inherit from a parent, call the parent's constructor, optionally extend
  // prototype with optional additional arguments
  subclass: function(parent) {
    var child = function() {
      this.__super__.apply(this, Utils.toArray(arguments));
    };
    Utils.inherit(child, parent);
    for (var i=1; i<arguments.length; i++) {
      Utils.extend(child.prototype, arguments[i]);
    }
    return child;
  }

};

var Utils = utils;


var Env = (function() {
  var inNode = typeof module !== 'undefined' && !!module.exports;
  var inBrowser = typeof window !== 'undefined' && !inNode;
  var inPhantom = inBrowser && !!(window.phantom && window.phantom.exit);
  var ieVersion = inBrowser && /MSIE ([0-9]+)/.exec(navigator.appVersion) && parseInt(RegExp.$1) || NaN;

  return {
    iPhone : inBrowser && !!(navigator.userAgent.match(/iPhone/i)),
    iPad : inBrowser && !!(navigator.userAgent.match(/iPad/i)),
    canvas: inBrowser && !!document.createElement('canvas').getContext,
    inNode : inNode,
    inPhantom : inPhantom,
    inBrowser: inBrowser,
    ieVersion: ieVersion,
    ie: !isNaN(ieVersion)
  };
})();


// Support for timing using T.start() and T.stop("message")
//
var T = {
  stack: [],
  verbose: true,

  start: function(msg) {
    if (T.verbose && msg) verbose(T.prefix() + msg);
    T.stack.push(+new Date);
  },

  // Stop timing, print a message if T.verbose == true
  stop: function(note) {
    var startTime = T.stack.pop();
    var elapsed = (+new Date - startTime);
    if (T.verbose) {
      var msg =  T.prefix() + elapsed + 'ms';
      if (note) {
        msg += " " + note;
      }
      verbose(msg);
    }
    return elapsed;
  },

  prefix: function() {
    var str = "- ",
        level = this.stack.length;
    while (level--) str = "-" + str;
    return str;
  }
};


// Append elements of @src array to @dest array
utils.merge = function(dest, src) {
  if (!utils.isArray(dest) || !utils.isArray(src)) {
    error("Usage: utils.merge(destArray, srcArray);")
  }
  if (src.length > 0) {
    dest.push.apply(dest, src);
  }
  return dest;
};

// Returns elements in arr and not in other
// (similar to underscore diff)
utils.difference = function(arr, other) {
  var index = utils.arrayToIndex(other);
  return arr.filter(function(el) {
    return !Object.prototype.hasOwnProperty.call(index, el);
  });
};

// Test a string or array-like object for existence of substring or element
utils.contains = function(container, item) {
  if (utils.isString(container)) {
    return container.indexOf(item) != -1;
  }
  else if (utils.isArrayLike(container)) {
    return utils.indexOf(container, item) != -1;
  }
  error("Expected Array or String argument");
};

utils.some = function(arr, test) {
  return arr.reduce(function(val, item) {
    return val || test(item); // TODO: short-circuit?
  }, false);
};

utils.every = function(arr, test) {
  return arr.reduce(function(val, item) {
    return val && test(item);
  }, true);
};

utils.find = function(arr, test, ctx) {
  var matches = arr.filter(test, ctx);
  return matches.length === 0 ? null : matches[0];
};

utils.indexOf = function(arr, item, prop) {
  if (prop) error("utils.indexOf() No longer supports property argument");
  var nan = !(item === item);
  for (var i = 0, len = arr.length || 0; i < len; i++) {
    if (arr[i] === item) return i;
    if (nan && !(arr[i] === arr[i])) return i;
  }
  return -1;
};

utils.range = function(len, start, inc) {
  var arr = [],
      v = start === void 0 ? 0 : start,
      i = inc === void 0 ? 1 : inc;
  while(len--) {
    arr.push(v);
    v += i;
  }
  return arr;
};

utils.repeat = function(times, func) {
  var values = [],
      val;
  for (var i=0; i<times; i++) {
    val = func(i);
    if (val !== void 0) {
      values[i] = val;
    }
  }
  return values.length > 0 ? values : void 0;
};

// Calc sum, skip falsy and NaN values
// Assumes: no other non-numeric objects in array
//
utils.sum = function(arr, info) {
  if (!utils.isArrayLike(arr)) error ("utils.sum() expects an array, received:", arr);
  var tot = 0,
      nan = 0,
      val;
  for (var i=0, n=arr.length; i<n; i++) {
    val = arr[i];
    if (val) {
      tot += val;
    } else if (isNaN(val)) {
      nan++;
    }
  }
  if (info) {
    info.nan = nan;
  }
  return tot;
};

// Calculate min and max values of an array, ignoring NaN values
utils.getArrayBounds = function(arr) {
  var min = Infinity,
    max = -Infinity,
    nan = 0, val;
  for (var i=0, len=arr.length; i<len; i++) {
    val = arr[i];
    if (val !== val) nan++;
    if (val < min) min = val;
    if (val > max) max = val;
  }
  return {
    min: min,
    max: max,
    nan: nan
  };
};

utils.uniq = function(src) {
  var index = {};
  return src.reduce(function(memo, el) {
    if (el in index === false) {
      index[el] = true;
      memo.push(el);
    }
    return memo;
  }, []);
};

utils.pluck = function(arr, key) {
  return arr.map(function(obj) {
    return obj[key];
  });
};

utils.countValues = function(arr) {
  return arr.reduce(function(memo, val) {
    memo[val] = (val in memo) ? memo[val] + 1 : 1;
    return memo;
  }, {});
};

utils.indexOn = function(arr, k) {
  return arr.reduce(function(index, o) {
    index[o[k]] = o;
    return index;
  }, {});
};

utils.groupBy = function(arr, k) {
  return arr.reduce(function(index, o) {
    var keyval = o[k];
    if (keyval in index) {
      index[keyval].push(o);
    } else {
      index[keyval] = [o]
    }
    return index;
  }, {});
};

utils.arrayToIndex = function(arr, val) {
  var init = arguments.length > 1;
  return arr.reduce(function(index, key) {
    index[key] = init ? val : true;
    return index;
  }, {});
};

// Support for iterating over array-like objects, like typed arrays
utils.forEach = function(arr, func, ctx) {
  if (!utils.isArrayLike(arr)) {
    throw new Error("#forEach() takes an array-like argument. " + arr);
  }
  for (var i=0, n=arr.length; i < n; i++) {
    func.call(ctx, arr[i], i);
  }
};

utils.forEachProperty = function(o, func, ctx) {
  Object.keys(o).forEach(function(key) {
    func.call(ctx, o[key], key);
  });
};

utils.initializeArray = function(arr, init) {
  for (var i=0, len=arr.length; i<len; i++) {
    arr[i] = init;
  }
  return arr;
};

utils.replaceArray = function(arr, arr2) {
  arr.splice(0, arr.length);
  arr.push.apply(arr, arr2);
};


Utils.repeatString = function(src, n) {
  var str = "";
  for (var i=0; i<n; i++)
    str += src;
  return str;
};

Utils.pluralSuffix = function(count) {
  return count != 1 ? 's' : '';
};

Utils.endsWith = function(str, ending) {
    return str.indexOf(ending, str.length - ending.length) !== -1;
};

Utils.lpad = function(str, size, pad) {
  pad = pad || ' ';
  str = String(str);
  return Utils.repeatString(pad, size - str.length) + str;
};

Utils.rpad = function(str, size, pad) {
  pad = pad || ' ';
  str = String(str);
  return str + Utils.repeatString(pad, size - str.length);
};

Utils.trim = function(str) {
  return Utils.ltrim(Utils.rtrim(str));
};

var ltrimRxp = /^\s+/;
Utils.ltrim = function(str) {
  return str.replace(ltrimRxp, '');
};

var rtrimRxp = /\s+$/;
Utils.rtrim = function(str) {
  return str.replace(rtrimRxp, '');
};

Utils.addThousandsSep = function(str) {
  var fmt = '',
      start = str[0] == '-' ? 1 : 0,
      dec = str.indexOf('.'),
      end = str.length,
      ins = (dec == -1 ? end : dec) - 3;
  while (ins > start) {
    fmt = ',' + str.substring(ins, end) + fmt;
    end = ins;
    ins -= 3;
  }
  return str.substring(0, end) + fmt;
};

Utils.numToStr = function(num, decimals) {
  return decimals >= 0 ? num.toFixed(decimals) : String(num);
};

Utils.formatNumber = function(num, decimals, nullStr, showPos) {
  var fmt;
  if (isNaN(num)) {
    fmt = nullStr || '-';
  } else {
    fmt = Utils.numToStr(num, decimals);
    fmt = Utils.addThousandsSep(fmt);
    if (showPos && parseFloat(fmt) > 0) {
      fmt = "+" + fmt;
    }
  }
  return fmt;
};



function Transform() {
  this.mx = this.my = 1;
  this.bx = this.by = 0;
}

Transform.prototype.isNull = function() {
  return !this.mx || !this.my || isNaN(this.bx) || isNaN(this.by);
};

Transform.prototype.invert = function() {
  var inv = new Transform();
  inv.mx = 1 / this.mx;
  inv.my = 1 / this.my;
  //inv.bx = -this.bx * inv.mx;
  //inv.by = -this.by * inv.my;
  inv.bx = -this.bx / this.mx;
  inv.by = -this.by / this.my;
  return inv;
};


Transform.prototype.transform = function(x, y, xy) {
  xy = xy || [];
  xy[0] = x * this.mx + this.bx;
  xy[1] = y * this.my + this.by;
  return xy;
};

Transform.prototype.toString = function() {
  return Utils.toString(Utils.extend({}, this));
};


function Bounds() {
  if (arguments.length > 0) {
    this.setBounds.apply(this, arguments);
  }
}

Bounds.prototype.toString = function() {
  return JSON.stringify({
    xmin: this.xmin,
    xmax: this.xmax,
    ymin: this.ymin,
    ymax: this.ymax
  });
};

Bounds.prototype.toArray = function() {
  return this.hasBounds() ? [this.xmin, this.ymin, this.xmax, this.ymax] : [];
};

Bounds.prototype.hasBounds = function() {
  return this.xmin <= this.xmax && this.ymin <= this.ymax;
};

Bounds.prototype.sameBounds =
Bounds.prototype.equals = function(bb) {
  return bb && this.xmin === bb.xmin && this.xmax === bb.xmax &&
    this.ymin === bb.ymin && this.ymax === bb.ymax;
};

Bounds.prototype.width = function() {
  return (this.xmax - this.xmin) || 0;
};

Bounds.prototype.height = function() {
  return (this.ymax - this.ymin) || 0;
};

Bounds.prototype.area = function() {
  return this.width() * this.height() || 0;
};

Bounds.prototype.empty = function() {
  this.xmin = this.ymin = this.xmax = this.ymax = void 0;
  return this;
};

Bounds.prototype.setBounds = function(a, b, c, d) {
  if (arguments.length == 1) {
    // assume first arg is a Bounds or array
    if (Utils.isArrayLike(a)) {
      b = a[1];
      c = a[2];
      d = a[3];
      a = a[0];
    } else {
      b = a.ymin;
      c = a.xmax;
      d = a.ymax;
      a = a.xmin;
    }
  }

  this.xmin = a;
  this.ymin = b;
  this.xmax = c;
  this.ymax = d;
  if (a > c || b > d) this.update();
  // error("Bounds#setBounds() min/max reversed:", a, b, c, d);
  return this;
};


Bounds.prototype.centerX = function() {
  var x = (this.xmin + this.xmax) * 0.5;
  return x;
};

Bounds.prototype.centerY = function() {
  var y = (this.ymax + this.ymin) * 0.5;
  return y;
};

Bounds.prototype.containsPoint = function(x, y) {
  if (x >= this.xmin && x <= this.xmax &&
    y <= this.ymax && y >= this.ymin) {
    return true;
  }
  return false;
};

// intended to speed up slightly bubble symbol detection; could use intersects() instead
// TODO: fix false positive where circle is just outside a corner of the box
Bounds.prototype.containsBufferedPoint =
Bounds.prototype.containsCircle = function(x, y, buf) {
  if ( x + buf > this.xmin && x - buf < this.xmax ) {
    if ( y - buf < this.ymax && y + buf > this.ymin ) {
      return true;
    }
  }
  return false;
};

Bounds.prototype.intersects = function(bb) {
  if (bb.xmin <= this.xmax && bb.xmax >= this.xmin &&
    bb.ymax >= this.ymin && bb.ymin <= this.ymax) {
    return true;
  }
  return false;
};

Bounds.prototype.contains = function(bb) {
  if (bb.xmin >= this.xmin && bb.ymax <= this.ymax &&
    bb.xmax <= this.xmax && bb.ymin >= this.ymin) {
    return true;
  }
  return false;
};

Bounds.prototype.shift = function(x, y) {
  this.setBounds(this.xmin + x,
    this.ymin + y, this.xmax + x, this.ymax + y);
};

Bounds.prototype.padBounds = function(a, b, c, d) {
  this.xmin -= a;
  this.ymin -= b;
  this.xmax += c;
  this.ymax += d;
};

// Rescale the bounding box by a fraction. TODO: implement focus.
// @param {number} pct Fraction of original extents
// @param {number} pctY Optional amount to scale Y
//
Bounds.prototype.scale = function(pct, pctY) { /*, focusX, focusY*/
  var halfWidth = (this.xmax - this.xmin) * 0.5;
  var halfHeight = (this.ymax - this.ymin) * 0.5;
  var kx = pct - 1;
  var ky = pctY === undefined ? kx : pctY - 1;
  this.xmin -= halfWidth * kx;
  this.ymin -= halfHeight * ky;
  this.xmax += halfWidth * kx;
  this.ymax += halfHeight * ky;
};

// Return a bounding box with the same extent as this one.
Bounds.prototype.cloneBounds = // alias so child classes can override clone()
Bounds.prototype.clone = function() {
  return new Bounds(this.xmin, this.ymin, this.xmax, this.ymax);
};

Bounds.prototype.clearBounds = function() {
  this.setBounds(new Bounds());
};

Bounds.prototype.mergePoint = function(x, y) {
  if (this.xmin === void 0) {
    this.setBounds(x, y, x, y);
  } else {
    // this works even if x,y are NaN
    if (x < this.xmin)  this.xmin = x;
    else if (x > this.xmax)  this.xmax = x;

    if (y < this.ymin) this.ymin = y;
    else if (y > this.ymax) this.ymax = y;
  }
};

// expands either x or y dimension to match @aspect (width/height ratio)
// @focusX, @focusY (optional): expansion focus, as a fraction of width and height
Bounds.prototype.fillOut = function(aspect, focusX, focusY) {
  if (arguments.length < 3) {
    focusX = 0.5;
    focusY = 0.5;
  }
  var w = this.width(),
      h = this.height(),
      currAspect = w / h,
      pad;
  if (isNaN(aspect) || aspect <= 0) {
    // error condition; don't pad
  } else if (currAspect < aspect) { // fill out x dimension
    pad = h * aspect - w;
    this.xmin -= (1 - focusX) * pad;
    this.xmax += focusX * pad;
  } else {
    pad = w / aspect - h;
    this.ymin -= (1 - focusY) * pad;
    this.ymax += focusY * pad;
  }
  return this;
};

Bounds.prototype.update = function() {
  var tmp;
  if (this.xmin > this.xmax) {
    tmp = this.xmin;
    this.xmin = this.xmax;
    this.xmax = tmp;
  }
  if (this.ymin > this.ymax) {
    tmp = this.ymin;
    this.ymin = this.ymax;
    this.ymax = tmp;
  }
};

Bounds.prototype.transform = function(t) {
  this.xmin = this.xmin * t.mx + t.bx;
  this.xmax = this.xmax * t.mx + t.bx;
  this.ymin = this.ymin * t.my + t.by;
  this.ymax = this.ymax * t.my + t.by;
  this.update();
  return this;
};

// Returns a Transform object for mapping this onto Bounds @b2
// @flipY (optional) Flip y-axis coords, for converting to/from pixel coords
//
Bounds.prototype.getTransform = function(b2, flipY) {
  var t = new Transform();
  t.mx = b2.width() / this.width();
  t.bx = b2.xmin - t.mx * this.xmin;
  if (flipY) {
    t.my = -b2.height() / this.height();
    t.by = b2.ymax - t.my * this.ymin;
  } else {
    t.my = b2.height() / this.height();
    t.by = b2.ymin - t.my * this.ymin;
  }
  return t;
};

Bounds.prototype.mergeCircle = function(x, y, r) {
  if (r < 0) r = -r;
  this.mergeBounds([x - r, y - r, x + r, y + r]);
};

Bounds.prototype.mergeBounds = function(bb) {
  var a, b, c, d;
  if (bb instanceof Bounds) {
    a = bb.xmin, b = bb.ymin, c = bb.xmax, d = bb.ymax;
  } else if (arguments.length == 4) {
    a = arguments[0];
    b = arguments[1];
    c = arguments[2];
    d = arguments[3];
  } else if (bb.length == 4) {
    // assume array: [xmin, ymin, xmax, ymax]
    a = bb[0], b = bb[1], c = bb[2], d = bb[3];
  } else {
    error("Bounds#mergeBounds() invalid argument:", bb);
  }

  if (this.xmin === void 0) {
    this.setBounds(a, b, c, d);
  } else {
    if (a < this.xmin) this.xmin = a;
    if (b < this.ymin) this.ymin = b;
    if (c > this.xmax) this.xmax = c;
    if (d > this.ymax) this.ymax = d;
  }
  return this;
};


// Sort an array of objects based on one or more properties.
// Usage: Utils.sortOn(array, key1, asc?[, key2, asc? ...])
//
Utils.sortOn = function(arr) {
  var comparators = [];
  for (var i=1; i<arguments.length; i+=2) {
    comparators.push(Utils.getKeyComparator(arguments[i], arguments[i+1]));
  }
  arr.sort(function(a, b) {
    var cmp = 0,
        i = 0,
        n = comparators.length;
    while (i < n && cmp === 0) {
      cmp = comparators[i](a, b);
      i++;
    }
    return cmp;
  });
  return arr;
};

// Sort array of values that can be compared with < > operators (strings, numbers)
// null, undefined and NaN are sorted to the end of the array
//
Utils.genericSort = function(arr, asc) {
  var compare = Utils.getGenericComparator(asc);
  Array.prototype.sort.call(arr, compare);
  return arr;
};

Utils.sortOnKey = function(arr, getter, asc) {
  var compare = Utils.getGenericComparator(asc !== false) // asc is default
  arr.sort(function(a, b) {
    return compare(getter(a), getter(b));
  });
};

// Stashes keys in a temp array (better if calculating key is expensive).
Utils.sortOnKey2 = function(arr, getKey, asc) {
  Utils.sortArrayByKeys(arr, arr.map(getKey), asc);
};

Utils.sortArrayByKeys = function(arr, keys, asc) {
  var ids = Utils.getSortedIds(keys, asc);
  Utils.reorderArray(arr, ids);
};

Utils.getSortedIds = function(arr, asc) {
  var ids = Utils.range(arr.length);
  Utils.sortArrayIndex(ids, arr, asc);
  return ids;
};

Utils.sortArrayIndex = function(ids, arr, asc) {
  var compare = Utils.getGenericComparator(asc);
  ids.sort(function(i, j) {
    // added i, j comparison to guarantee that sort is stable
    var cmp = compare(arr[i], arr[j]);
    return cmp > 0 || cmp === 0 && i < j ? 1 : -1;
  });
};

Utils.reorderArray = function(arr, idxs) {
  var len = idxs.length;
  var arr2 = [];
  for (var i=0; i<len; i++) {
    var idx = idxs[i];
    if (idx < 0 || idx >= len) error("Out-of-bounds array idx");
    arr2[i] = arr[idx];
  }
  Utils.replaceArray(arr, arr2);
};

Utils.getKeyComparator = function(key, asc) {
  var compare = Utils.getGenericComparator(asc);
  return function(a, b) {
    return compare(a[key], b[key]);
  };
};

Utils.getGenericComparator = function(asc) {
  asc = asc !== false;
  return function(a, b) {
    var retn = 0;
    if (b == null) {
      retn = a == null ? 0 : -1;
    } else if (a == null) {
      retn = 1;
    } else if (a < b) {
      retn = asc ? -1 : 1;
    } else if (a > b) {
      retn = asc ? 1 : -1;
    } else if (a !== a) {
      retn = 1;
    } else if (b !== b) {
      retn = -1;
    }
    return retn;
  };
};



// Generic in-place sort (null, NaN, undefined not handled)
Utils.quicksort = function(arr, asc) {
  Utils.quicksortPartition(arr, 0, arr.length-1);
  if (asc === false) Array.prototype.reverse.call(arr); // Works with typed arrays
  return arr;
};

// Moved out of Utils.quicksort() (saw >100% speedup in Chrome with deep recursion)
Utils.quicksortPartition = function (a, lo, hi) {
  var i = lo,
      j = hi,
      pivot, tmp;
  while (i < hi) {
    pivot = a[lo + hi >> 1]; // avoid n^2 performance on sorted arrays
    while (i <= j) {
      while (a[i] < pivot) i++;
      while (a[j] > pivot) j--;
      if (i <= j) {
        tmp = a[i];
        a[i] = a[j];
        a[j] = tmp;
        i++;
        j--;
      }
    }
    if (lo < j) Utils.quicksortPartition(a, lo, j);
    lo = i;
    j = hi;
  }
};


Utils.findRankByValue = function(arr, value) {
  if (isNaN(value)) return arr.length;
  var rank = 1;
  for (var i=0, n=arr.length; i<n; i++) {
    if (value > arr[i]) rank++;
  }
  return rank;
}

Utils.findValueByPct = function(arr, pct) {
  var rank = Math.ceil((1-pct) * (arr.length));
  return Utils.findValueByRank(arr, rank);
};

// See http://ndevilla.free.fr/median/median/src/wirth.c
// Elements of @arr are reordered
//
Utils.findValueByRank = function(arr, rank) {
  if (!arr.length || rank < 1 || rank > arr.length) error("[findValueByRank()] invalid input");

  rank = Utils.clamp(rank | 0, 1, arr.length);
  var k = rank - 1, // conv. rank to array index
      n = arr.length,
      l = 0,
      m = n - 1,
      i, j, val, tmp;

  while (l < m) {
    val = arr[k];
    i = l;
    j = m;
    do {
      while (arr[i] < val) {i++;}
      while (val < arr[j]) {j--;}
      if (i <= j) {
        tmp = arr[i];
        arr[i] = arr[j];
        arr[j] = tmp;
        i++;
        j--;
      }
    } while (i <= j);
    if (j < k) l = i;
    if (k < i) m = j;
  }
  return arr[k];
};

//
//
Utils.findMedian = function(arr) {
  var n = arr.length,
      rank = Math.floor(n / 2) + 1,
      median = Utils.findValueByRank(arr, rank);
  if ((n & 1) == 0) {
    median = (median + Utils.findValueByRank(arr, rank - 1)) / 2;
  }
  return median;
};


// Wrapper for DataView class for more convenient reading and writing of
//   binary data; Remembers endianness and read/write position.
// Has convenience methods for copying from buffers, etc.
//
function BinArray(buf, le) {
  if (Utils.isNumber(buf)) {
    buf = new ArrayBuffer(buf);
  } else if (Env.inNode && buf instanceof Buffer == true) {
    // Since node 0.10, DataView constructor doesn't accept Buffers,
    //   so need to copy Buffer to ArrayBuffer
    buf = BinArray.toArrayBuffer(buf);
  }
  if (buf instanceof ArrayBuffer == false) {
    error("BinArray constructor takes an integer, ArrayBuffer or Buffer argument");
  }
  this._buffer = buf;
  this._bytes = new Uint8Array(buf);
  this._view = new DataView(buf);
  this._idx = 0;
  this._le = le !== false;
}

BinArray.bufferToUintArray = function(buf, wordLen) {
  if (wordLen == 4) return new Uint32Array(buf);
  if (wordLen == 2) return new Uint16Array(buf);
  if (wordLen == 1) return new Uint8Array(buf);
  error("BinArray.bufferToUintArray() invalid word length:", wordLen)
};

BinArray.uintSize = function(i) {
  return i & 1 || i & 2 || 4;
};

BinArray.bufferCopy = function(dest, destId, src, srcId, bytes) {
  srcId = srcId || 0;
  bytes = bytes || src.byteLength - srcId;
  if (dest.byteLength - destId < bytes)
    error("Buffer overflow; tried to write:", bytes);

  // When possible, copy buffer data in multi-byte chunks... Added this for faster copying of
  // shapefile data, which is aligned to 32 bits.
  var wordSize = Math.min(BinArray.uintSize(bytes), BinArray.uintSize(srcId),
      BinArray.uintSize(dest.byteLength), BinArray.uintSize(destId),
      BinArray.uintSize(src.byteLength));

  var srcArr = BinArray.bufferToUintArray(src, wordSize),
      destArr = BinArray.bufferToUintArray(dest, wordSize),
      count = bytes / wordSize,
      i = srcId / wordSize,
      j = destId / wordSize;

  while (count--) {
    destArr[j++] = srcArr[i++];
  }
  return bytes;
};

BinArray.toArrayBuffer = function(src) {
  var n = src.length,
      dest = new ArrayBuffer(n),
      view = new Uint8Array(dest);
  for (var i=0; i<n; i++) {
      view[i] = src[i];
  }
  return dest;
};

// Return length in bytes of an ArrayBuffer or Buffer
//
BinArray.bufferSize = function(buf) {
  return (buf instanceof ArrayBuffer ?  buf.byteLength : buf.length | 0);
};

Utils.buffersAreIdentical = function(a, b) {
  var alen = BinArray.bufferSize(a);
  var blen = BinArray.bufferSize(b);
  if (alen != blen) {
    return false;
  }
  for (var i=0; i<alen; i++) {
    if (a[i] !== b[i]) {
      return false;
    }
  }
  return true;
};

BinArray.prototype = {
  size: function() {
    return this._buffer.byteLength;
  },

  littleEndian: function() {
    this._le = true;
    return this;
  },

  bigEndian: function() {
    this._le = false;
    return this;
  },

  buffer: function() {
    return this._buffer;
  },

  bytesLeft: function() {
    return this._buffer.byteLength - this._idx;
  },

  skipBytes: function(bytes) {
    this._idx += (bytes + 0);
    return this;
  },

  readUint8: function() {
    return this._bytes[this._idx++];
  },

  writeUint8: function(val) {
    this._bytes[this._idx++] = val;
    return this;
  },

  readInt8: function() {
    return this._view.getInt8(this._idx++);
  },

  writeInt8: function(val) {
    this._view.setInt8(this._idx++, val);
    return this;
  },

  readUint16: function() {
    var val = this._view.getUint16(this._idx, this._le);
    this._idx += 2;
    return val;
  },

  writeUint16: function(val) {
    this._view.setUint16(this._idx, val, this._le);
    this._idx += 2;
    return this;
  },

  readUint32: function() {
    var val = this._view.getUint32(this._idx, this._le);
    this._idx += 4;
    return val;
  },

  writeUint32: function(val) {
    this._view.setUint32(this._idx, val, this._le);
    this._idx += 4;
    return this;
  },

  readInt32: function() {
    var val = this._view.getInt32(this._idx, this._le);
    this._idx += 4;
    return val;
  },

  writeInt32: function(val) {
    this._view.setInt32(this._idx, val, this._le);
    this._idx += 4;
    return this;
  },

  readFloat64: function() {
    var val = this._view.getFloat64(this._idx, this._le);
    this._idx += 8;
    return val;
  },

  writeFloat64: function(val) {
    this._view.setFloat64(this._idx, val, this._le);
    this._idx += 8;
    return this;
  },

  // Returns a Float64Array containing @len doubles
  //
  readFloat64Array: function(len) {
    var bytes = len * 8,
        i = this._idx,
        buf = this._buffer,
        arr;
    // Inconsistent: first is a view, second a copy...
    if (i % 8 === 0) {
      arr = new Float64Array(buf, i, len);
    } else if (buf.slice) {
      arr = new Float64Array(buf.slice(i, i + bytes));
    } else { // ie10, etc
      var dest = new ArrayBuffer(bytes);
      BinArray.bufferCopy(dest, 0, buf, i, bytes);
      arr = new Float64Array(dest);
    }
    this._idx += bytes;
    return arr;
  },

  readUint32Array: function(len) {
    var arr = [];
    for (var i=0; i<len; i++) {
      arr.push(this.readUint32());
    }
    return arr;
  },

  peek: function(i) {
    return this._view.getUint8(i >= 0 ? i : this._idx);
  },

  position: function(i) {
    if (i != null) {
      this._idx = i;
      return this;
    }
    return this._idx;
  },

  readCString: function(fixedLen, asciiOnly) {
    var str = "",
        count = fixedLen >= 0 ? fixedLen : this.bytesLeft();
    while (count > 0) {
      var byteVal = this.readUint8();
      count--;
      if (byteVal == 0) {
        break;
      } else if (byteVal > 127 && asciiOnly) {
        str = null;
        break;
      }
      str += String.fromCharCode(byteVal);
    }

    if (fixedLen > 0 && count > 0) {
      this.skipBytes(count);
    }
    return str;
  },

  writeString: function(str, maxLen) {
    var bytesWritten = 0,
        charsToWrite = str.length,
        cval;
    if (maxLen) {
      charsToWrite = Math.min(charsToWrite, maxLen);
    }
    for (var i=0; i<charsToWrite; i++) {
      cval = str.charCodeAt(i);
      if (cval > 127) {
        trace("#writeCString() Unicode value beyond ascii range")
        cval = '?'.charCodeAt(0);
      }
      this.writeUint8(cval);
      bytesWritten++;
    }
    return bytesWritten;
  },

  writeCString: function(str, fixedLen) {
    var maxChars = fixedLen ? fixedLen - 1 : null,
        bytesWritten = this.writeString(str, maxChars);

    this.writeUint8(0); // terminator
    bytesWritten++;

    if (fixedLen) {
      while (bytesWritten < fixedLen) {
        this.writeUint8(0);
        bytesWritten++;
      }
    }
    return this;
  },

  writeBuffer: function(buf, bytes, startIdx) {
    this._idx += BinArray.bufferCopy(this._buffer, this._idx, buf, startIdx, bytes);
    return this;
  }
};


/*
A simplified version of printf formatting
Format codes: %[flags][width][.precision]type

supported flags:
  +   add '+' before positive numbers
  0   left-pad with '0'
  '   Add thousands separator
width: 1 to many
precision: .(1 to many)
type:
  s     string
  di    integers
  f     decimal numbers
  xX    hexidecimal (unsigned)
  %     literal '%'

Examples:
  code    val    formatted
  %+d     1      '+1'
  %4i     32     '  32'
  %04i    32     '0032'
  %x      255    'ff'
  %.2f    0.125  '0.13'
  %'f     1000   '1,000'
*/

// Usage: Utils.format(formatString, [values])
// Tip: When reusing the same format many times, use Utils.formatter() for 5x - 10x better performance
//
Utils.format = function(fmt) {
  var fn = Utils.formatter(fmt);
  var str = fn.apply(null, Array.prototype.slice.call(arguments, 1));
  return str;
};

function formatValue(val, matches) {
  var flags = matches[1];
  var padding = matches[2];
  var decimals = matches[3] ? parseInt(matches[3].substr(1)) : void 0;
  var type = matches[4];
  var isString = type == 's',
      isHex = type == 'x' || type == 'X',
      isInt = type == 'd' || type == 'i',
      isFloat = type == 'f',
      isNumber = !isString;

  var sign = "",
      padDigits = 0,
      isZero = false,
      isNeg = false;

  var str;
  if (isString) {
    str = String(val);
  }
  else if (isHex) {
    str = val.toString(16);
    if (type == 'X')
      str = str.toUpperCase();
  }
  else if (isNumber) {
    str = Utils.numToStr(val, isInt ? 0 : decimals);
    if (str[0] == '-') {
      isNeg = true;
      str = str.substr(1);
    }
    isZero = parseFloat(str) == 0;
    if (flags.indexOf("'") != -1 || flags.indexOf(',') != -1) {
      str = Utils.addThousandsSep(str);
    }
    if (!isZero) { // BUG: sign is added when num rounds to 0
      if (isNeg) {
        sign = "\u2212"; // U+2212
      } else if (flags.indexOf('+') != -1) {
        sign = '+';
      }
    }
  }

  if (padding) {
    var strLen = str.length + sign.length;
    var minWidth = parseInt(padding, 10);
    if (strLen < minWidth) {
      padDigits = minWidth - strLen;
      var padChar = flags.indexOf('0') == -1 ? ' ' : '0';
      var padStr = Utils.repeatString(padChar, padDigits);
    }
  }

  if (padDigits == 0) {
    str = sign + str;
  } else if (padChar == '0') {
    str = sign + padStr + str;
  } else {
    str = padStr + sign + str;
  }
  return str;
}

// Get a function for interpolating formatted values into a string.
Utils.formatter = function(fmt) {
  var codeRxp = /%([\',+0]*)([1-9]?)((?:\.[1-9])?)([sdifxX%])/g;
  var literals = [],
      formatCodes = [],
      startIdx = 0,
      prefix = "",
      literal,
      matches;

  while (matches=codeRxp.exec(fmt)) {
    literal = fmt.substring(startIdx, codeRxp.lastIndex - matches[0].length);
    if (matches[0] == '%%') {
      prefix += literal + '%';
    } else {
      literals.push(prefix + literal);
      prefix = '';
      formatCodes.push(matches);
    }
    startIdx = codeRxp.lastIndex;
  }
  literals.push(prefix + fmt.substr(startIdx));

  return function() {
    var str = literals[0],
        n = arguments.length;
    if (n != formatCodes.length) {
      error("[format()] Data does not match format string; format:", fmt, "data:", arguments);
    }
    for (var i=0; i<n; i++) {
      str += formatValue(arguments[i], formatCodes[i]) + literals[i+1];
    }
    return str;
  };
};






utils.wildcardToRegExp = function(name) {
  var rxp = name.split('*').map(function(str) {
    return utils.regexEscape(str);
  }).join('.*');
  return new RegExp('^' + rxp + '$');
};

utils.expandoBuffer = function(constructor, rate) {
  var capacity = 0,
      k = rate >= 1 ? rate : 1.2,
      buf;
  return function(size) {
    if (size > capacity) {
      capacity = Math.ceil(size * k);
      buf = new constructor(capacity);
    }
    return buf;
  };
};

utils.copyElements = function(src, i, dest, j, n, rev) {
  if (src === dest && j > i) error ("copy error");
  var inc = 1,
      offs = 0;
  if (rev) {
    inc = -1;
    offs = n - 1;
  }
  for (var k=0; k<n; k++, offs += inc) {
    dest[k + j] = src[i + offs];
  }
};

utils.extendBuffer = function(src, newLen, copyLen) {
  var len = Math.max(src.length, newLen);
  var n = copyLen || src.length;
  var dest = new src.constructor(len);
  utils.copyElements(src, 0, dest, 0, n);
  return dest;
};

utils.mergeNames = function(name1, name2) {
  var merged = "";
  if (name1 && name2) {
    merged = utils.findStringPrefix(name1, name2).replace(/[-_]$/, '');
  }
  return merged;
};

utils.findStringPrefix = function(a, b) {
  var i = 0;
  for (var n=a.length; i<n; i++) {
    if (a[i] !== b[i]) break;
  }
  return a.substr(0, i);
};

// Similar to isFinite() but does not convert strings or other types
utils.isFiniteNumber = function(val) {
  return val === 0 || !!val && val.constructor == Number && val !== Infinity && val !== -Infinity;
};




var api = {};
var MapShaper = {
  VERSION: VERSION, // export version
  LOGGING: false,
  TRACING: false,
  VERBOSE: false
};

new Float64Array(1); // workaround for https://github.com/nodejs/node/issues/6006

function error() {
  MapShaper.error.apply(null, utils.toArray(arguments));
}

// Handle an error caused by invalid input or misuse of API
function stop() {
  MapShaper.stop.apply(null, utils.toArray(arguments));
}

function APIError(msg) {
  var err = new Error(msg);
  err.name = 'APIError';
  return err;
}

function message() {
  MapShaper.message.apply(null, utils.toArray(arguments));
}

function verbose() {
  if (MapShaper.VERBOSE && MapShaper.LOGGING) {
    MapShaper.logArgs(arguments);
  }
}

function trace() {
  if (MapShaper.TRACING) {
    MapShaper.logArgs(arguments);
  }
}

function absArcId(arcId) {
  return arcId >= 0 ? arcId : ~arcId;
}

api.enableLogging = function() {
  MapShaper.LOGGING = true;
  return api;
};

api.printError = function(err) {
  var msg;
  if (utils.isString(err)) {
    err = new APIError(err);
  }
  if (MapShaper.LOGGING && err.name == 'APIError') {
    msg = err.message;
    if (!/Error/.test(msg)) {
      msg = "Error: " + msg;
    }
    message(msg);
    message("Run mapshaper -h to view help");
  } else {
    throw err;
  }
};

MapShaper.error = function() {
  var msg = Utils.toArray(arguments).join(' ');
  throw new Error(msg);
};

MapShaper.stop = function() {
  throw new APIError(MapShaper.formatLogArgs(arguments));
};

MapShaper.message = function() {
  if (MapShaper.LOGGING) {
    MapShaper.logArgs(arguments);
  }
};

MapShaper.formatLogArgs = function(args) {
  return utils.toArray(args).join(' ');
};

// Format an array of (preferably short) strings in columns for console logging.
MapShaper.formatStringsAsGrid = function(arr) {
  // TODO: variable column width
  var longest = arr.reduce(function(len, str) {
        return Math.max(len, str.length);
      }, 0),
      colWidth = longest + 2,
      perLine = Math.floor(80 / colWidth) || 1;
  return arr.reduce(function(memo, name, i) {
    var col = i % perLine;
    if (i > 0 && col === 0) memo += '\n';
    if (col < perLine - 1) { // right-pad all but rightmost column
      name = utils.rpad(name, colWidth - 2, ' ');
    }
    return memo +  '  ' + name;
  }, '');
};

MapShaper.logArgs = function(args) {
  if (utils.isArrayLike(args)) {
    (console.error || console.log).call(console, MapShaper.formatLogArgs(args));
  }
};

MapShaper.getWorldBounds = function(e) {
  e = utils.isFiniteNumber(e) ? e : 1e-10;
  return [-180 + e, -90 + e, 180 - e, 90 - e];
};

MapShaper.probablyDecimalDegreeBounds = function(b) {
  var world = MapShaper.getWorldBounds(-1), // add a bit of excess
      bbox = (b instanceof Bounds) ? b.toArray() : b;
  return containsBounds(world, bbox);
};

MapShaper.layerHasGeometry = function(lyr) {
  return MapShaper.layerHasPaths(lyr) || MapShaper.layerHasPoints(lyr);
};

MapShaper.layerHasPaths = function(lyr) {
  return (lyr.geometry_type == 'polygon' || lyr.geometry_type == 'polyline') &&
    MapShaper.layerHasNonNullShapes(lyr);
};

MapShaper.layerHasPoints = function(lyr) {
  return lyr.geometry_type == 'point' && MapShaper.layerHasNonNullShapes(lyr);
};

MapShaper.layerHasNonNullShapes = function(lyr) {
  return utils.some(lyr.shapes || [], function(shp) {
    return !!shp;
  });
};

MapShaper.requireDataFields = function(table, fields, cmd) {
  var prefix = cmd ? '[' + cmd + '] ' : '';
  if (!table) {
    stop(prefix + "Missing attribute data");
  }
  var dataFields = table.getFields(),
      missingFields = utils.difference(fields, dataFields);
  if (missingFields.length > 0) {
    stop(prefix + "Table is missing one or more fields:\n",
        missingFields, "\nExisting fields:", '\n' + MapShaper.formatStringsAsGrid(dataFields));
  }
};

MapShaper.requirePolygonLayer = function(lyr, msg) {
  if (!lyr || lyr.geometry_type !== 'polygon') stop(msg || "Expected a polygon layer");
};

MapShaper.requirePathLayer = function(lyr, msg) {
  if (!lyr || !MapShaper.layerHasPaths(lyr)) stop(msg || "Expected a polygon or polyline layer");
};




var R = 6378137;
var D2R = Math.PI / 180;

// Equirectangular projection
function degreesToMeters(deg) {
  return deg * D2R * R;
}

function distance3D(ax, ay, az, bx, by, bz) {
  var dx = ax - bx,
    dy = ay - by,
    dz = az - bz;
  return Math.sqrt(dx * dx + dy * dy + dz * dz);
}

function distanceSq(ax, ay, bx, by) {
  var dx = ax - bx,
      dy = ay - by;
  return dx * dx + dy * dy;
}

function distance2D(ax, ay, bx, by) {
  var dx = ax - bx,
      dy = ay - by;
  return Math.sqrt(dx * dx + dy * dy);
}

function distanceSq3D(ax, ay, az, bx, by, bz) {
  var dx = ax - bx,
      dy = ay - by,
      dz = az - bz;
  return dx * dx + dy * dy + dz * dz;
}

function getRoundingFunction(inc) {
  if (!utils.isNumber(inc) || inc === 0) {
    error("Rounding increment must be a non-zero number.");
  }
  var inv = 1 / inc;
  if (inv > 1) inv = Math.round(inv);
  return function(x) {
    return Math.round(x * inv) / inv;
    // these alternatives show rounding error after JSON.stringify()
    // return Math.round(x / inc) / inv;
    // return Math.round(x / inc) * inc;
    // return Math.round(x * inv) * inc;
  };
}

// Return id of nearest point to x, y, among x0, y0, x1, y1, ...
function nearestPoint(x, y, x0, y0) {
  var minIdx = -1,
      minDist = Infinity,
      dist;
  for (var i = 0, j = 2, n = arguments.length; j < n; i++, j += 2) {
    dist = distanceSq(x, y, arguments[j], arguments[j+1]);
    if (dist < minDist) {
      minDist = dist;
      minIdx = i;
    }
  }
  return minIdx;
}

function lineIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y) {
  var den = determinant2D(s1p2x - s1p1x, s1p2y - s1p1y, s2p2x - s2p1x, s2p2y - s2p1y);
  if (den === 0) return null;
  var m = orient2D(s2p1x, s2p1y, s2p2x, s2p2y, s1p1x, s1p1y) / den;
  var x = s1p1x + m * (s1p2x - s1p1x);
  var y = s1p1y + m * (s1p2y - s1p1y);
  return [x, y];
}

// Get intersection point if segments are non-collinear, else return null
// Assumes that segments intersect
function crossIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y) {
  var p = lineIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y);
  var nearest;
  if (p) {
    // Re-order operands so intersection point is closest to s1p1 (better precision)
    // Source: Jonathan Shewchuk http://www.cs.berkeley.edu/~jrs/meshpapers/robnotes.pdf
    nearest = nearestPoint(p[0], p[1], s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y);
    if (nearest == 1) {
      // use b a c d
      p = lineIntersection(s1p2x, s1p2y, s1p1x, s1p1y, s2p1x, s2p1y, s2p2x, s2p2y);
    } else if (nearest == 2) {
      // use c d a b
      p = lineIntersection(s2p1x, s2p1y, s2p2x, s2p2y, s1p1x, s1p1y, s1p2x, s1p2y);
    } else if (nearest == 3) {
      // use d c a b
      p = lineIntersection(s2p2x, s2p2y, s2p1x, s2p1y, s1p1x, s1p1y, s1p2x, s1p2y);
    }
  }
  return p;
}

// Source: Sedgewick, _Algorithms in C_
// (Tried various other functions that failed owing to floating point errors)
function segmentHit(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y) {
  return orient2D(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y) *
      orient2D(s1p1x, s1p1y, s1p2x, s1p2y, s2p2x, s2p2y) <= 0 &&
      orient2D(s2p1x, s2p1y, s2p2x, s2p2y, s1p1x, s1p1y) *
      orient2D(s2p1x, s2p1y, s2p2x, s2p2y, s1p2x, s1p2y) <= 0;
}

function inside(x, minX, maxX) {
  return x > minX && x < maxX;
}

function sortSeg(x1, y1, x2, y2) {
  return x1 < x2 || x1 == x2 && y1 < y2 ? [x1, y1, x2, y2] : [x2, y2, x1, y1];
}

// Assume segments s1 and s2 are collinear and overlap; find one or two internal endpoints points
// TODO: refactor
function collinearIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y) {
  var minX = Math.min(s1p1x, s1p2x, s2p1x, s2p2x),
      maxX = Math.max(s1p1x, s1p2x, s2p1x, s2p2x),
      minY = Math.min(s1p1y, s1p2y, s2p1y, s2p2y),
      maxY = Math.max(s1p1y, s1p2y, s2p1y, s2p2y),
      useY = maxY - minY > maxX - minX,
      coords = [];

  if (useY ? inside(s1p1y, minY, maxY) : inside(s1p1x, minX, maxX)) {
    coords.push(s1p1x, s1p1y);
  }
  if (useY ? inside(s1p2y, minY, maxY) : inside(s1p2x, minX, maxX)) {
    coords.push(s1p2x, s1p2y);
  }
  if (useY ? inside(s2p1y, minY, maxY) : inside(s2p1x, minX, maxX)) {
    coords.push(s2p1x, s2p1y);
  }
  if (useY ? inside(s2p2y, minY, maxY) : inside(s2p2x, minX, maxX)) {
    coords.push(s2p2x, s2p2y);
  }
  if (coords.length != 2 && coords.length != 4) {
    // e.g. congruent segments
    trace("Invalid collinear segment intersection", coords);
    coords = null;
  } else if (coords.length == 4 && coords[0] == coords[2] && coords[1] == coords[3]) {
    // segs that meet in the middle don't count
    coords = null;
  }
  return coords;
}

function endpointHit(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y) {
  return s1p1x == s2p1x && s1p1y == s2p1y || s1p1x == s2p2x && s1p1y == s2p2y ||
          s1p2x == s2p1x && s1p2y == s2p1y || s1p2x == s2p2x && s1p2y == s2p2y;
}

// Find intersections between two 2D segments.
// Return [x, y] point if segments intersect at a single point or are overlapping+collinear
//   and one endpoint is inside overlapping portion
// Return [x1, y1, x2, y2] if segments are overlapping+collinear and have two endpoints inside overlapping portion
// Return null if segments do not touch
function segmentIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y) {
  var hit = segmentHit(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y),
      p = null;
  if (hit) {
    p = crossIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y);
    if (!p) { // colinear if p is null
      p = collinearIntersection(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y);
    } else if (endpointHit(s1p1x, s1p1y, s1p2x, s1p2y, s2p1x, s2p1y, s2p2x, s2p2y)) {
      p = null; // filter out segments that only intersect at an endpoint
    }
  }
  return p;
}

// Determinant of matrix
//  | a  b |
//  | c  d |
function determinant2D(a, b, c, d) {
  return a * d - b * c;
}

// Source: Jonathan Shewchuk http://www.cs.berkeley.edu/~jrs/meshpapers/robnotes.pdf
function orient2D(x0, y0, x1, y1, x2, y2) {
  return determinant2D(x0 - x2, y0 - y2, x1 - x2, y1 - y2);
}

// atan2() makes this function fairly slow, replaced by ~2x faster formula
function innerAngle2(ax, ay, bx, by, cx, cy) {
  var a1 = Math.atan2(ay - by, ax - bx),
      a2 = Math.atan2(cy - by, cx - bx),
      a3 = Math.abs(a1 - a2);
  if (a3 > Math.PI) {
    a3 = 2 * Math.PI - a3;
  }
  return a3;
}

// Return angle abc in range [0, 2PI) or NaN if angle is invalid
// (e.g. if length of ab or bc is 0)
/*
function signedAngle2(ax, ay, bx, by, cx, cy) {
  var a1 = Math.atan2(ay - by, ax - bx),
      a2 = Math.atan2(cy - by, cx - bx),
      a3 = a2 - a1;

  if (ax == bx && ay == by || bx == cx && by == cy) {
    a3 = NaN; // Use NaN for invalid angles
  } else if (a3 >= Math.PI * 2) {
    a3 = 2 * Math.PI - a3;
  } else if (a3 < 0) {
    a3 = a3 + 2 * Math.PI;
  }
  return a3;
}
*/

function standardAngle(a) {
  var twoPI = Math.PI * 2;
  while (a < 0) {
    a += twoPI;
  }
  while (a >= twoPI) {
    a -= twoPI;
  }
  return a;
}

function signedAngle(ax, ay, bx, by, cx, cy) {
  if (ax == bx && ay == by || bx == cx && by == cy) {
    return NaN; // Use NaN for invalid angles
  }
  var abx = ax - bx,
      aby = ay - by,
      cbx = cx - bx,
      cby = cy - by,
      dotp = abx * cbx + aby * cby,
      crossp = abx * cby - aby * cbx,
      a = Math.atan2(crossp, dotp);
  return standardAngle(a);
}

// Calc bearing in radians at lng1, lat1
function bearing(lng1, lat1, lng2, lat2) {
  var D2R = Math.PI / 180;
  lng1 *= D2R;
  lng2 *= D2R;
  lat1 *= D2R;
  lat2 *= D2R;
  var y = Math.sin(lng2-lng1) * Math.cos(lat2),
      x = Math.cos(lat1)*Math.sin(lat2) - Math.sin(lat1)*Math.cos(lat2)*Math.cos(lng2-lng1);
  return Math.atan2(y, x);
}

// Calc angle of turn from ab to bc, in range [0, 2PI)
// Receive lat-lng values in degrees
function signedAngleSph(alng, alat, blng, blat, clng, clat) {
  if (alng == blng && alat == blat || blng == clng && blat == clat) {
    return NaN;
  }
  var b1 = bearing(blng, blat, alng, alat), // calc bearing at b
      b2 = bearing(blng, blat, clng, clat),
      a = Math.PI * 2 + b1 - b2;
  return standardAngle(a);
}

/*
// Convert arrays of lng and lat coords (xsrc, ysrc) into
// x, y, z coords (meters) on the most common spherical Earth model.
//
function convLngLatToSph(xsrc, ysrc, xbuf, ybuf, zbuf) {
  var deg2rad = Math.PI / 180,
      r = R;
  for (var i=0, len=xsrc.length; i<len; i++) {
    var lng = xsrc[i] * deg2rad,
        lat = ysrc[i] * deg2rad,
        cosLat = Math.cos(lat);
    xbuf[i] = Math.cos(lng) * cosLat * r;
    ybuf[i] = Math.sin(lng) * cosLat * r;
    zbuf[i] = Math.sin(lat) * r;
  }
}
*/

// Convert arrays of lng and lat coords (xsrc, ysrc) into
// x, y, z coords (meters) on the most common spherical Earth model.
//
function convLngLatToSph(xsrc, ysrc, xbuf, ybuf, zbuf) {
  var p = [];
  for (var i=0, len=xsrc.length; i<len; i++) {
    lngLatToXYZ(xsrc[i], ysrc[i], p);
    xbuf[i] = p[0];
    ybuf[i] = p[1];
    zbuf[i] = p[2];
  }
}

function xyzToLngLat(x, y, z, p) {
  var d = distance3D(0, 0, 0, x, y, z); // normalize
  var lat = Math.asin(z / d) / D2R;
  var lng = Math.atan2(y / d, x / d) / D2R;
  p[0] = lng;
  p[1] = lat;
}

function lngLatToXYZ(lng, lat, p) {
  var cosLat;
  lng *= D2R;
  lat *= D2R;
  cosLat = Math.cos(lat);
  p[0] = Math.cos(lng) * cosLat * R;
  p[1] = Math.sin(lng) * cosLat * R;
  p[2] = Math.sin(lat) * R;
}

// Haversine formula (well conditioned at small distances)
function sphericalDistance(lam1, phi1, lam2, phi2) {
  var dlam = lam2 - lam1,
      dphi = phi2 - phi1,
      a = Math.sin(dphi / 2) * Math.sin(dphi / 2) +
          Math.cos(phi1) * Math.cos(phi2) *
          Math.sin(dlam / 2) * Math.sin(dlam / 2),
      c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  return c;
}

// Receive: coords in decimal degrees;
// Return: distance in meters on spherical earth
function greatCircleDistance(lng1, lat1, lng2, lat2) {
  var D2R = Math.PI / 180,
      dist = sphericalDistance(lng1 * D2R, lat1 * D2R, lng2 * D2R, lat2 * D2R);
  return dist * R;
}

// TODO: make this safe for small angles
function innerAngle(ax, ay, bx, by, cx, cy) {
  var ab = distance2D(ax, ay, bx, by),
      bc = distance2D(bx, by, cx, cy),
      theta, dotp;
  if (ab === 0 || bc === 0) {
    theta = 0;
  } else {
    dotp = ((ax - bx) * (cx - bx) + (ay - by) * (cy - by)) / (ab * bc);
    if (dotp >= 1 - 1e-14) {
      theta = 0;
    } else if (dotp <= -1 + 1e-14) {
      theta = Math.PI;
    } else {
      theta = Math.acos(dotp); // consider using other formula at small dp
    }
  }
  return theta;
}

function innerAngle3D(ax, ay, az, bx, by, bz, cx, cy, cz) {
  var ab = distance3D(ax, ay, az, bx, by, bz),
      bc = distance3D(bx, by, bz, cx, cy, cz),
      theta, dotp;
  if (ab === 0 || bc === 0) {
    theta = 0;
  } else {
    dotp = ((ax - bx) * (cx - bx) + (ay - by) * (cy - by) + (az - bz) * (cz - bz)) / (ab * bc);
    if (dotp >= 1) {
      theta = 0;
    } else if (dotp <= -1) {
      theta = Math.PI;
    } else {
      theta = Math.acos(dotp); // consider using other formula at small dp
    }
  }
  return theta;
}

function triangleArea(ax, ay, bx, by, cx, cy) {
  var area = Math.abs(((ay - cy) * (bx - cx) + (by - cy) * (cx - ax)) / 2);
  return area;
}

function detSq(ax, ay, bx, by, cx, cy) {
  var det = ax * by - ax * cy + bx * cy - bx * ay + cx * ay - cx * by;
  return det * det;
}

function cosine(ax, ay, bx, by, cx, cy) {
  var den = distance2D(ax, ay, bx, by) * distance2D(bx, by, cx, cy),
      cos = 0;
  if (den > 0) {
    cos = ((ax - bx) * (cx - bx) + (ay - by) * (cy - by)) / den;
    if (cos > 1) cos = 1; // handle fp rounding error
    else if (cos < -1) cos = -1;
  }
  return cos;
}

function cosine3D(ax, ay, az, bx, by, bz, cx, cy, cz) {
  var den = distance3D(ax, ay, az, bx, by, bz) * distance3D(bx, by, bz, cx, cy, cz),
      cos = 0;
  if (den > 0) {
    cos = ((ax - bx) * (cx - bx) + (ay - by) * (cy - by) + (az - bz) * (cz - bz)) / den;
    if (cos > 1) cos = 1; // handle fp rounding error
    else if (cos < -1) cos = -1;
  }
  return cos;
}

function triangleArea3D(ax, ay, az, bx, by, bz, cx, cy, cz) {
  var area = 0.5 * Math.sqrt(detSq(ax, ay, bx, by, cx, cy) +
    detSq(ax, az, bx, bz, cx, cz) + detSq(ay, az, by, bz, cy, cz));
  return area;
}

// Given point B and segment AC, return the squared distance from B to the
// nearest point on AC
// Receive the squared length of segments AB, BC, AC
//
function apexDistSq(ab2, bc2, ac2) {
  var dist2;
  if (ac2 === 0) {
    dist2 = ab2;
  } else if (ab2 >= bc2 + ac2) {
    dist2 = bc2;
  } else if (bc2 >= ab2 + ac2) {
    dist2 = ab2;
  } else {
    var dval = (ab2 + ac2 - bc2);
    dist2 = ab2 -  dval * dval / ac2  * 0.25;
  }
  if (dist2 < 0) {
    dist2 = 0;
  }
  return dist2;
}

function pointSegDistSq(ax, ay, bx, by, cx, cy) {
  var ab2 = distanceSq(ax, ay, bx, by),
      ac2 = distanceSq(ax, ay, cx, cy),
      bc2 = distanceSq(bx, by, cx, cy);
  return apexDistSq(ab2, ac2, bc2);
}

function pointSegDistSq3D(ax, ay, az, bx, by, bz, cx, cy, cz) {
  var ab2 = distanceSq3D(ax, ay, az, bx, by, bz),
      ac2 = distanceSq3D(ax, ay, az, cx, cy, cz),
      bc2 = distanceSq3D(bx, by, bz, cx, cy, cz);
  return apexDistSq(ab2, ac2, bc2);
}

MapShaper.calcArcBounds = function(xx, yy, start, len) {
  var i = start | 0,
      n = isNaN(len) ? xx.length - i : len + i,
      x, y, xmin, ymin, xmax, ymax;
  if (n > 0) {
    xmin = xmax = xx[i];
    ymin = ymax = yy[i];
  }
  for (i++; i<n; i++) {
    x = xx[i];
    y = yy[i];
    if (x < xmin) xmin = x;
    if (x > xmax) xmax = x;
    if (y < ymin) ymin = y;
    if (y > ymax) ymax = y;
  }
  return [xmin, ymin, xmax, ymax];
};

MapShaper.reversePathCoords = function(arr, start, len) {
  var i = start,
      j = start + len - 1,
      tmp;
  while (i < j) {
    tmp = arr[i];
    arr[i] = arr[j];
    arr[j] = tmp;
    i++;
    j--;
  }
};

// merge B into A
function mergeBounds(a, b) {
  if (b[0] < a[0]) a[0] = b[0];
  if (b[1] < a[1]) a[1] = b[1];
  if (b[2] > a[2]) a[2] = b[2];
  if (b[3] > a[3]) a[3] = b[3];
}

function containsBounds(a, b) {
  return a[0] <= b[0] && a[2] >= b[2] && a[1] <= b[1] && a[3] >= b[3];
}

function boundsArea(b) {
  return (b[2] - b[0]) * (b[3] - b[1]);
}

// export functions so they can be tested
var geom = {
  R: R,
  D2R: D2R,
  degreesToMeters: degreesToMeters,
  getRoundingFunction: getRoundingFunction,
  segmentHit: segmentHit,
  segmentIntersection: segmentIntersection,
  distanceSq: distanceSq,
  distance3D: distance3D,
  innerAngle: innerAngle,
  innerAngle2: innerAngle2,
  signedAngle: signedAngle,
  bearing: bearing,
  signedAngleSph: signedAngleSph,
  standardAngle: standardAngle,
  convLngLatToSph: convLngLatToSph,
  lngLatToXYZ: lngLatToXYZ,
  xyzToLngLat: xyzToLngLat,
  sphericalDistance: sphericalDistance,
  greatCircleDistance: greatCircleDistance,
  pointSegDistSq: pointSegDistSq,
  pointSegDistSq3D: pointSegDistSq3D,
  innerAngle3D: innerAngle3D,
  triangleArea: triangleArea,
  triangleArea3D: triangleArea3D,
  cosine: cosine,
  cosine3D: cosine3D
};



// Constructor takes arrays of coords: xx, yy, zz (optional)
//
// Iterate over the points of an arc
// properties: x, y
// method: hasNext()
// usage:
//   while (iter.hasNext()) {
//     iter.x, iter.y; // do something w/ x & y
//   }
//
function ArcIter(xx, yy) {
  this._i = 0;
  this._n = 0;
  this._inc = 1;
  this._xx = xx;
  this._yy = yy;
  this.i = 0;
  this.x = 0;
  this.y = 0;
}

ArcIter.prototype.init = function(i, len, fw) {
  if (fw) {
    this._i = i;
    this._inc = 1;
  } else {
    this._i = i + len - 1;
    this._inc = -1;
  }
  this._n = len;
  return this;
};

ArcIter.prototype.hasNext = function() {
  var i = this._i;
  if (this._n > 0) {
    this._i = i + this._inc;
    this.x = this._xx[i];
    this.y = this._yy[i];
    this.i = i;
    this._n--;
    return true;
  }
  return false;
};

function FilteredArcIter(xx, yy, zz) {
  var _zlim = 0,
      _i = 0,
      _inc = 1,
      _stop = 0;

  this.init = function(i, len, fw, zlim) {
    _zlim = zlim || 0;
    if (fw) {
      _i = i;
      _inc = 1;
      _stop = i + len;
    } else {
      _i = i + len - 1;
      _inc = -1;
      _stop = i - 1;
    }
    return this;
  };

  this.hasNext = function() {
    // using local vars is significantly faster when skipping many points
    var zarr = zz,
        i = _i,
        j = i,
        zlim = _zlim,
        stop = _stop,
        inc = _inc;
    if (i == stop) return false;
    do {
      j += inc;
    } while (j != stop && zarr[j] < zlim);
    _i = j;
    this.x = xx[i];
    this.y = yy[i];
    this.i = i;
    return true;
  };
}

// Iterate along a path made up of one or more arcs.
// Similar interface to ArcIter()
//
function ShapeIter(arcs) {
  this._arcs = arcs;
  this._i = 0;
  this._n = 0;
  this.x = 0;
  this.y = 0;
}

ShapeIter.prototype.hasNext = function() {
  var arc = this._arc;
  if (this._i < this._n === false) {
    return false;
  }
  if (arc.hasNext()) {
    this.x = arc.x;
    this.y = arc.y;
    return true;
  }
  this.nextArc();
  return this.hasNext();
};

ShapeIter.prototype.init = function(ids) {
  this._ids = ids;
  this._n = ids.length;
  this.reset();
  return this;
};

ShapeIter.prototype.nextArc = function() {
  var i = this._i + 1;
  if (i < this._n) {
    this._arc = this._arcs.getArcIter(this._ids[i]);
    if (i > 0) this._arc.hasNext(); // skip first point
  }
  this._i = i;
};

ShapeIter.prototype.reset = function() {
  this._i = -1;
  this.nextArc();
};




// An interface for managing a collection of paths.
// Constructor signatures:
//
// ArcCollection(arcs)
//    arcs is an array of polyline arcs; each arc is an array of points: [[x0, y0], [x1, y1], ... ]
//
// ArcCollection(nn, xx, yy)
//    nn is an array of arc lengths; xx, yy are arrays of concatenated coords;
function ArcCollection() {
  var _xx, _yy,  // coordinates data
      _ii, _nn,  // indexes, sizes
      _zz, _zlimit = 0, // simplification
      _bb, _allBounds, // bounding boxes
      _arcIter, _filteredArcIter; // path iterators

  if (arguments.length == 1) {
    initLegacyArcs(arguments[0]);  // want to phase this out
  } else if (arguments.length == 3) {
    initXYData.apply(this, arguments);
  } else {
    error("ArcCollection() Invalid arguments");
  }

  function initLegacyArcs(arcs) {
    var xx = [], yy = [];
    var nn = arcs.map(function(points) {
      var n = points ? points.length : 0;
      for (var i=0; i<n; i++) {
        xx.push(points[i][0]);
        yy.push(points[i][1]);
      }
      return n;
    });
    initXYData(nn, xx, yy);
  }

  function initXYData(nn, xx, yy) {
    var size = nn.length;
    if (nn instanceof Array) nn = new Uint32Array(nn);
    if (xx instanceof Array) xx = new Float64Array(xx);
    if (yy instanceof Array) yy = new Float64Array(yy);
    _xx = xx;
    _yy = yy;
    _nn = nn;
    _zz = null;
    _filteredArcIter = null;

    // generate array of starting idxs of each arc
    _ii = new Uint32Array(size);
    for (var idx = 0, j=0; j<size; j++) {
      _ii[j] = idx;
      idx += nn[j];
    }

    if (idx != _xx.length || _xx.length != _yy.length) {
      error("ArcCollection#initXYData() Counting error");
    }

    initBounds();
    // Pre-allocate some path iterators for repeated use.
    _arcIter = new ArcIter(_xx, _yy);
    return this;
  }

  function initZData(zz) {
    if (!zz) {
      _zz = null;
      _filteredArcIter = null;
    } else {
      if (zz.length != _xx.length) error("ArcCollection#initZData() mismatched arrays");
      if (zz instanceof Array) zz = new Float64Array(zz);
      _zz = zz;
      _filteredArcIter = new FilteredArcIter(_xx, _yy, _zz);
    }
  }

  function initBounds() {
    var data = calcArcBounds(_xx, _yy, _nn);
    _bb = data.bb;
    _allBounds = data.bounds;
  }

  function calcArcBounds(xx, yy, nn) {
    var numArcs = nn.length,
        bb = new Float64Array(numArcs * 4),
        bounds = new Bounds(),
        arcOffs = 0,
        arcLen,
        j, b;
    for (var i=0; i<numArcs; i++) {
      arcLen = nn[i];
      if (arcLen > 0) {
        j = i * 4;
        b = MapShaper.calcArcBounds(xx, yy, arcOffs, arcLen);
        bb[j++] = b[0];
        bb[j++] = b[1];
        bb[j++] = b[2];
        bb[j] = b[3];
        arcOffs += arcLen;
        bounds.mergeBounds(b);
      }
    }
    return {
      bb: bb,
      bounds: bounds
    };
  }

  this.updateVertexData = function(nn, xx, yy, zz) {
    initXYData(nn, xx, yy);
    initZData(zz || null);
  };

  // Give access to raw data arrays...
  this.getVertexData = function() {
    return {
      xx: _xx,
      yy: _yy,
      zz: _zz,
      bb: _bb,
      nn: _nn,
      ii: _ii
    };
  };

  this.getCopy = function() {
    var copy = new ArcCollection(new Int32Array(_nn), new Float64Array(_xx),
        new Float64Array(_yy));
    if (_zz) copy.setThresholds(new Float64Array(_zz));
    return copy;
  };

  function getFilteredPointCount() {
    var zz = _zz, z = _zlimit;
    if (!zz || !z) return this.getPointCount();
    var count = 0;
    for (var i=0, n = zz.length; i<n; i++) {
      if (zz[i] >= z) count++;
    }
    return count;
  }

  function getFilteredVertexData() {
    var len2 = getFilteredPointCount();
    var arcCount = _nn.length;
    var xx2 = new Float64Array(len2),
        yy2 = new Float64Array(len2),
        zz2 = new Float64Array(len2),
        nn2 = new Int32Array(arcCount),
        i=0, i2 = 0,
        n, n2;

    for (var arcId=0; arcId < arcCount; arcId++) {
      n2 = 0;
      n = _nn[arcId];
      for (var end = i+n; i < end; i++) {
        if (_zz[i] >= _zlimit) {
          xx2[i2] = _xx[i];
          yy2[i2] = _yy[i];
          zz2[i2] = _zz[i];
          i2++;
          n2++;
        }
      }
      if (n2 < 2) error("Collapsed arc"); // endpoints should be z == Infinity
      nn2[arcId] = n2;
    }
    return {
      xx: xx2,
      yy: yy2,
      zz: zz2,
      nn: nn2
    };
  }

  this.getFilteredCopy = function() {
    if (!_zz || _zlimit === 0) return this.getCopy();
    var data = getFilteredVertexData();
    var copy = new ArcCollection(data.nn, data.xx, data.yy);
    copy.setThresholds(data.zz);
    return copy;
  };

  // Return arcs as arrays of [x, y] points (intended for testing).
  this.toArray = function() {
    var arr = [];
    this.forEach(function(iter) {
      var arc = [];
      while (iter.hasNext()) {
        arc.push([iter.x, iter.y]);
      }
      arr.push(arc);
    });
    return arr;
  };

  this.toString = function() {
    return JSON.stringify(this.toArray());
  };

  // @cb function(i, j, xx, yy)
  this.forEachArcSegment = function(arcId, cb) {
    var fw = arcId >= 0,
        absId = fw ? arcId : ~arcId,
        zlim = this.getRetainedInterval(),
        n = _nn[absId],
        step = fw ? 1 : -1,
        v1 = fw ? _ii[absId] : _ii[absId] + n - 1,
        v2 = v1,
        count = 0;

    for (var j = 1; j < n; j++) {
      v2 += step;
      if (zlim === 0 || _zz[v2] >= zlim) {
        cb(v1, v2, _xx, _yy);
        v1 = v2;
        count++;
      }
    }
    return count;
  };

  // @cb function(i, j, xx, yy)
  this.forEachSegment = function(cb) {
    var count = 0;
    for (var i=0, n=this.size(); i<n; i++) {
      count += this.forEachArcSegment(i, cb);
    }
    return count;
  };

  this.transformPoints = function(f) {
    var xx = _xx, yy = _yy, p;
    for (var i=0, n=xx.length; i<n; i++) {
      p = f(xx[i], yy[i]);
      xx[i] = p[0];
      yy[i] = p[1];
    }
    initBounds();
  };

  // Return an ArcIter object for each path in the dataset
  //
  this.forEach = function(cb) {
    for (var i=0, n=this.size(); i<n; i++) {
      cb(this.getArcIter(i), i);
    }
  };

  // Iterate over arcs with access to low-level data
  //
  this.forEach2 = function(cb) {
    for (var arcId=0, n=this.size(); arcId<n; arcId++) {
      cb(_ii[arcId], _nn[arcId], _xx, _yy, _zz, arcId);
    }
  };

  this.forEach3 = function(cb) {
    var start, end, xx, yy, zz;
    for (var arcId=0, n=this.size(); arcId<n; arcId++) {
      start = _ii[arcId];
      end = start + _nn[arcId];
      xx = _xx.subarray(start, end);
      yy = _yy.subarray(start, end);
      if (_zz) zz = _zz.subarray(start, end);
      cb(xx, yy, zz, arcId);
    }
  };

  // Remove arcs that don't pass a filter test and re-index arcs
  // Return array mapping original arc ids to re-indexed ids. If arr[n] == -1
  // then arc n was removed. arr[n] == m indicates that the arc at n was
  // moved to index m.
  // Return null if no arcs were re-indexed (and no arcs were removed)
  //
  this.filter = function(cb) {
    var map = new Int32Array(this.size()),
        goodArcs = 0,
        goodPoints = 0;
    for (var i=0, n=this.size(); i<n; i++) {
      if (cb(this.getArcIter(i), i)) {
        map[i] = goodArcs++;
        goodPoints += _nn[i];
      } else {
        map[i] = -1;
      }
    }
    if (goodArcs === this.size()) {
      return null;
    } else {
      condenseArcs(map);
      if (goodArcs === 0) {
        // no remaining arcs
      }
      return map;
    }
  };

  function condenseArcs(map) {
    var goodPoints = 0,
        goodArcs = 0,
        copyElements = utils.copyElements,
        k, arcLen;
    for (var i=0, n=map.length; i<n; i++) {
      k = map[i];
      arcLen = _nn[i];
      if (k > -1) {
        copyElements(_xx, _ii[i], _xx, goodPoints, arcLen);
        copyElements(_yy, _ii[i], _yy, goodPoints, arcLen);
        if (_zz) copyElements(_zz, _ii[i], _zz, goodPoints, arcLen);
        _nn[k] = arcLen;
        goodPoints += arcLen;
        goodArcs++;
      }
    }

    initXYData(_nn.subarray(0, goodArcs), _xx.subarray(0, goodPoints),
        _yy.subarray(0, goodPoints));
    if (_zz) initZData(_zz.subarray(0, goodPoints));
  }

  this.dedupCoords = function() {
    var arcId = 0, i = 0, i2 = 0,
        arcCount = this.size(),
        zz = _zz,
        arcLen, arcLen2;
    while (arcId < arcCount) {
      arcLen = _nn[arcId];
      arcLen2 = MapShaper.dedupArcCoords(i, i2, arcLen, _xx, _yy, zz);
      _nn[arcId] = arcLen2;
      i += arcLen;
      i2 += arcLen2;
      arcId++;
    }
    if (i > i2) {
      initXYData(_nn, _xx.subarray(0, i2), _yy.subarray(0, i2));
      if (zz) initZData(zz.subarray(0, i2));
    }
    return i - i2;
  };

  this.getVertex = function(arcId, nth) {
    var i = this.indexOfVertex(arcId, nth);
    return {
      x: _xx[i],
      y: _yy[i]
    };
  };

  this.indexOfVertex = function(arcId, nth) {
    var absId = arcId < 0 ? ~arcId : arcId,
        len = _nn[absId];
    if (nth < 0) nth = len + nth;
    if (absId != arcId) nth = len - nth - 1;
    if (nth < 0 || nth >= len) error("[ArcCollection] out-of-range vertex id");
    return _ii[absId] + nth;
  };

  // Test whether the vertex at index @idx is the endpoint of an arc
  this.pointIsEndpoint = function(idx) {
    var ii = _ii,
        nn = _nn;
    for (var j=0, n=ii.length; j<n; j++) {
      if (idx === ii[j] || idx === ii[j] + nn[j] - 1) return true;
    }
    return false;
  };

  // Tests if arc endpoints have same x, y coords
  // (arc may still have collapsed);
  this.arcIsClosed = function(arcId) {
    var i = this.indexOfVertex(arcId, 0),
        j = this.indexOfVertex(arcId, -1);
    return i != j && _xx[i] == _xx[j] && _yy[i] == _yy[j];
  };

  // Tests if first and last segments mirror each other
  // A 3-vertex arc with same endpoints tests true
  this.arcIsLollipop = function(arcId) {
    var len = this.getArcLength(arcId),
        i, j;
    if (len <= 2 || !this.arcIsClosed(arcId)) return false;
    i = this.indexOfVertex(arcId, 1);
    j = this.indexOfVertex(arcId, -2);
    return _xx[i] == _xx[j] && _yy[i] == _yy[j];
  };

  this.arcIsDegenerate = function(arcId) {
    var iter = this.getArcIter(arcId);
    var i = 0,
        x, y;
    while (iter.hasNext()) {
      if (i > 0) {
        if (x != iter.x || y != iter.y) return false;
      }
      x = iter.x;
      y = iter.y;
      i++;
    }
    return true;
  };

  this.getArcLength = function(arcId) {
    return _nn[absArcId(arcId)];
  };

  this.getArcIter = function(arcId) {
    var fw = arcId >= 0,
        i = fw ? arcId : ~arcId,
        iter = _zz && _zlimit ? _filteredArcIter : _arcIter;
    if (i >= _nn.length) {
      error("#getArcId() out-of-range arc id:", arcId);
    }
    return iter.init(_ii[i], _nn[i], fw, _zlimit);
  };

  this.getShapeIter = function(ids) {
    return new ShapeIter(this).init(ids);
  };

  // Add simplification data to the dataset
  // @thresholds is either a single typed array or an array of arrays of removal thresholds for each arc;
  //
  this.setThresholds = function(thresholds) {
    var n = this.getPointCount(),
        zz = null;
    if (!thresholds) {
      // nop
    } else if (thresholds.length == n) {
      zz = thresholds;
    } else if (thresholds.length == this.size()) {
      zz = flattenThresholds(thresholds, n);
    } else {
      error("Invalid threshold data");
    }
    initZData(zz);
    return this;
  };

  function flattenThresholds(arr, n) {
    var zz = new Float64Array(n),
        i = 0;
    arr.forEach(function(arr) {
      for (var j=0, n=arr.length; j<n; i++, j++) {
        zz[i] = arr[j];
      }
    });
    if (i != n) error("Mismatched thresholds");
    return zz;
  }

  // bake in current simplification level, if any
  this.flatten = function() {
    if (_zlimit > 0) {
      var data = getFilteredVertexData();
      this.updateVertexData(data.nn, data.xx, data.yy);
      _zlimit = 0;
    } else {
      _zz = null;
    }
  };

  this.getRetainedInterval = function() {
    return _zlimit;
  };

  this.setRetainedInterval = function(z) {
    _zlimit = z;
    return this;
  };

  this.getRetainedPct = function() {
    return this.getPctByThreshold(_zlimit);
  };

  this.setRetainedPct = function(pct) {
    if (pct >= 1) {
      _zlimit = 0;
    } else {
      _zlimit = this.getThresholdByPct(pct);
      _zlimit = MapShaper.clampIntervalByPct(_zlimit, pct);
    }
    return this;
  };

  // Return array of z-values that can be removed for simplification
  //
  this.getRemovableThresholds = function(nth) {
    if (!_zz) error("[arcs] Missing simplification data.");
    var skip = nth | 1,
        arr = new Float64Array(Math.ceil(_zz.length / skip)),
        z;
    for (var i=0, j=0, n=this.getPointCount(); i<n; i+=skip) {
      z = _zz[i];
      if (z != Infinity) {
        arr[j++] = z;
      }
    }
    return arr.subarray(0, j);
  };

  this.getArcThresholds = function(arcId) {
    if (!(arcId >= 0 && arcId < this.size())) {
      error("[arcs] Invalid arc id:", arcId);
    }
    var start = _ii[arcId],
        end = start + _nn[arcId];
    return _zz.subarray(start, end);
  };

  this.getPctByThreshold = function(val) {
    var arr, rank, pct;
    if (val > 0) {
      arr = this.getRemovableThresholds();
      rank = utils.findRankByValue(arr, val);
      pct = arr.length > 0 ? 1 - (rank - 1) / arr.length : 1;
    } else {
      pct = 1;
    }
    return pct;
  };

  this.getThresholdByPct = function(pct) {
    var tmp = this.getRemovableThresholds(),
        rank, z;
    if (tmp.length === 0) { // No removable points
      rank = 0;
    } else {
      rank = Math.floor((1 - pct) * (tmp.length + 2));
    }

    if (rank <= 0) {
      z = 0;
    } else if (rank > tmp.length) {
      z = Infinity;
    } else {
      z = utils.findValueByRank(tmp, rank);
    }
    return z;
  };

  this.arcIntersectsBBox = function(i, b1) {
    var b2 = _bb,
        j = i * 4;
    return b2[j] <= b1[2] && b2[j+2] >= b1[0] && b2[j+3] >= b1[1] && b2[j+1] <= b1[3];
  };

  this.arcIsContained = function(i, b1) {
    var b2 = _bb,
        j = i * 4;
    return b2[j] >= b1[0] && b2[j+2] <= b1[2] && b2[j+1] >= b1[1] && b2[j+3] <= b1[3];
  };

  this.arcIsSmaller = function(i, units) {
    var bb = _bb,
        j = i * 4;
    return bb[j+2] - bb[j] < units && bb[j+3] - bb[j+1] < units;
  };

  // TODO: allow datasets in lat-lng coord range to be flagged as planar
  this.isPlanar = function() {
    return !MapShaper.probablyDecimalDegreeBounds(this.getBounds());
  };

  this.size = function() {
    return _ii && _ii.length || 0;
  };

  this.getPointCount = function() {
    return _xx && _xx.length || 0;
  };

  this.getBounds = function() {
    return _allBounds;
  };

  this.getSimpleShapeBounds = function(arcIds, bounds) {
    bounds = bounds || new Bounds();
    for (var i=0, n=arcIds.length; i<n; i++) {
      this.mergeArcBounds(arcIds[i], bounds);
    }
    return bounds;
  };

  this.getSimpleShapeBounds2 = function(arcIds, arr) {
    var bbox = arr || [],
        bb = _bb,
        id = absArcId(arcIds[0]) * 4;
    bbox[0] = bb[id];
    bbox[1] = bb[++id];
    bbox[2] = bb[++id];
    bbox[3] = bb[++id];
    for (var i=1, n=arcIds.length; i<n; i++) {
      id = absArcId(arcIds[i]) * 4;
      if (bb[id] < bbox[0]) bbox[0] = bb[id];
      if (bb[++id] < bbox[1]) bbox[1] = bb[id];
      if (bb[++id] > bbox[2]) bbox[2] = bb[id];
      if (bb[++id] > bbox[3]) bbox[3] = bb[id];
    }
    return bbox;
  };

  this.getMultiShapeBounds = function(shapeIds, bounds) {
    bounds = bounds || new Bounds();
    if (shapeIds) { // handle null shapes
      for (var i=0, n=shapeIds.length; i<n; i++) {
        this.getSimpleShapeBounds(shapeIds[i], bounds);
      }
    }
    return bounds;
  };

  this.mergeArcBounds = function(arcId, bounds) {
    if (arcId < 0) arcId = ~arcId;
    var offs = arcId * 4;
    bounds.mergeBounds(_bb[offs], _bb[offs+1], _bb[offs+2], _bb[offs+3]);
  };
}

ArcCollection.prototype.inspect = function() {
  var n = this.getPointCount(), str;
  if (n < 50) {
    str = JSON.stringify(this.toArray());
  } else {
    str = '[ArcCollection (' + this.size() + ')]';
  }
  return str;
};

// Remove duplicate coords and NaNs
MapShaper.dedupArcCoords = function(src, dest, arcLen, xx, yy, zz) {
  var n = 0, n2 = 0; // counters
  var x, y, i, j, keep;
  while (n < arcLen) {
    j = src + n;
    x = xx[j];
    y = yy[j];
    keep = x == x && y == y && (n2 === 0 || x != xx[j-1] || y != yy[j-1]);
    if (keep) {
      i = dest + n2;
      xx[i] = x;
      yy[i] = y;
      n2++;
    }
    if (zz && n2 > 0 && (keep || zz[j] > zz[i])) {
      zz[i] = zz[j];
    }
    n++;
  }
  return n2 > 1 ? n2 : 0;
};




MapShaper.countPointsInLayer = function(lyr) {
  var count = 0;
  if (MapShaper.layerHasPoints(lyr)) {
    MapShaper.forEachPoint(lyr.shapes, function() {count++;});
  }
  return count;
};

MapShaper.forEachPoint = function(shapes, cb) {
  shapes.forEach(function(shape, id) {
    var n = shape ? shape.length : 0;
    for (var i=0; i<n; i++) {
      cb(shape[i], id);
    }
  });
};

MapShaper.transformPointsInLayer = function(lyr, f) {
  if (MapShaper.layerHasPoints(lyr)) {
    MapShaper.forEachPoint(lyr.shapes, function(p) {
      var p2 = f(p[0], p[1]);
      p[0] = p2[0];
      p[1] = p2[1];
    });
  }
};




// Utility functions for working with ArcCollection and arrays of arc ids.

// @counts A typed array for accumulating count of each abs arc id
//   (assume it won't overflow)
MapShaper.countArcsInShapes = function(shapes, counts) {
  MapShaper.traversePaths(shapes, null, function(obj) {
    var arcs = obj.arcs,
        id;
    for (var i=0; i<arcs.length; i++) {
      id = arcs[i];
      if (id < 0) id = ~id;
      counts[id]++;
    }
  });
};


// Returns subset of shapes in @shapes that contain one or more arcs in @arcIds
MapShaper.findShapesByArcId = function(shapes, arcIds, numArcs) {
  var index = numArcs ? new Uint8Array(numArcs) : [],
      found = [];
  arcIds.forEach(function(id) {
    index[absArcId(id)] = 1;
  });
  shapes.forEach(function(shp, shpId) {
    var isHit = false;
    MapShaper.forEachArcId(shp || [], function(id) {
      isHit = isHit || index[absArcId(id)] == 1;
    });
    if (isHit) {
      found.push(shpId);
    }
  });
  return found;
};

// @shp An element of the layer.shapes array
//   (may be null, or, depending on layer type, an array of points or an array of arrays of arc ids)
MapShaper.cloneShape = function(shp) {
  if (!shp) return null;
  return shp.map(function(part) {
    return part.concat();
  });
};

MapShaper.cloneShapes = function(arr) {
  return utils.isArray(arr) ? arr.map(MapShaper.cloneShape) : null;
};

// a and b are arrays of arc ids
MapShaper.pathsAreIdentical = function(a, b) {
  if (a.length != b.length) return false;
  for (var i=0, n=a.length; i<n; i++) {
    if (a[i] != b[i]) return false;
  }
  return true;
};

MapShaper.reversePath = function(ids) {
  ids.reverse();
  for (var i=0, n=ids.length; i<n; i++) {
    ids[i] = ~ids[i];
  }
};

MapShaper.clampIntervalByPct = function(z, pct) {
  if (pct <= 0) z = Infinity;
  else if (pct >= 1) z = 0;
  return z;
};

MapShaper.findNextRemovableVertices = function(zz, zlim, start, end) {
  var i = MapShaper.findNextRemovableVertex(zz, zlim, start, end),
      arr, k;
  if (i > -1) {
    k = zz[i];
    arr = [i];
    while (++i < end) {
      if (zz[i] == k) {
        arr.push(i);
      }
    }
  }
  return arr || null;
};

// Return id of the vertex between @start and @end with the highest
// threshold that is less than @zlim, or -1 if none
//
MapShaper.findNextRemovableVertex = function(zz, zlim, start, end) {
  var tmp, jz = 0, j = -1, z;
  if (start > end) {
    tmp = start;
    start = end;
    end = tmp;
  }
  for (var i=start+1; i<end; i++) {
    z = zz[i];
    if (z < zlim && z > jz) {
      j = i;
      jz = z;
    }
  }
  return j;
};

// Visit each arc id in a shape (array of array of arc ids)
// Use non-undefined return values of callback @cb as replacements.
MapShaper.forEachArcId = function(arr, cb) {
  var item;
  for (var i=0; i<arr.length; i++) {
    item = arr[i];
    if (item instanceof Array) {
      MapShaper.forEachArcId(item, cb);
    } else if (utils.isInteger(item)) {
      var val = cb(item);
      if (val !== void 0) {
        arr[i] = val;
      }
    } else if (item) {
      error("Non-integer arc id in:", arr);
    }
  }
};

MapShaper.forEachPath = function(paths, cb) {
  MapShaper.editPaths(paths, cb);
};

// @cb: function(path, i, paths)
//
MapShaper.editPaths = function(paths, cb) {
  if (!paths) return null; // null shape
  if (!utils.isArray(paths)) error("[editPaths()] Expected an array, found:", arr);
  var nulls = 0,
      n = paths.length,
      retn;

  for (var i=0; i<n; i++) {
    retn = cb(paths[i], i, paths);
    if (retn === null) {
      nulls++;
      paths[i] = null;
    } else if (utils.isArray(retn)) {
      paths[i] = retn;
    }
  }
  if (nulls == n) {
    return null;
  } else if (nulls > 0) {
    return paths.filter(function(ids) {return !!ids;});
  } else {
    return paths;
  }
};

MapShaper.forEachPathSegment = function(shape, arcs, cb) {
  MapShaper.forEachArcId(shape, function(arcId) {
    arcs.forEachArcSegment(arcId, cb);
  });
};

MapShaper.traversePaths = function traversePaths(shapes, cbArc, cbPart, cbShape) {
  var segId = 0;
  shapes.forEach(function(parts, shapeId) {
    if (!parts || parts.length === 0) return; // null shape
    var arcIds, arcId;
    if (cbShape) {
      cbShape(shapeId);
    }
    for (var i=0, m=parts.length; i<m; i++) {
      arcIds = parts[i];
      if (cbPart) {
        cbPart({
          i: i,
          shapeId: shapeId,
          shape: parts,
          arcs: arcIds
        });
      }

      if (cbArc) {
        for (var j=0, n=arcIds.length; j<n; j++, segId++) {
          arcId = arcIds[j];
          cbArc({
            i: j,
            shapeId: shapeId,
            partId: i,
            arcId: arcId,
            segId: segId
          });
        }
      }
    }
  });
};

MapShaper.arcHasLength = function(id, coords) {
  var iter = coords.getArcIter(id), x, y;
  if (iter.hasNext()) {
    x = iter.x;
    y = iter.y;
    while (iter.hasNext()) {
      if (iter.x != x || iter.y != y) return true;
    }
  }
  return false;
};

MapShaper.filterEmptyArcs = function(shape, coords) {
  if (!shape) return null;
  var shape2 = [];
  shape.forEach(function(ids) {
    var path = [];
    for (var i=0; i<ids.length; i++) {
      if (MapShaper.arcHasLength(ids[i], coords)) {
        path.push(ids[i]);
      }
    }
    if (path.length > 0) shape2.push(path);
  });
  return shape2.length > 0 ? shape2 : null;
};

// Bundle holes with their containing rings for Topo/GeoJSON polygon export.
// Assumes outer rings are CW and inner (hole) rings are CCW.
// @paths array of objects with path metadata -- see MapShaper.exportPathData()
//
// TODO: Improve reliability. Currently uses winding order, area and bbox to
//   identify holes and their enclosures -- could be confused by strange
//   geometry.
//
MapShaper.groupPolygonRings = function(paths) {
  var pos = [],
      neg = [];
  if (paths) {
    paths.forEach(function(path) {
      if (path.area > 0) {
        pos.push(path);
      } else if (path.area < 0) {
        neg.push(path);
      } else {
        // verbose("Zero-area ring, skipping");
      }
    });
  }

  var output = pos.map(function(part) {
    return [part];
  });

  neg.forEach(function(hole) {
    var containerId = -1,
        containerArea = 0;
    for (var i=0, n=pos.length; i<n; i++) {
      var part = pos[i],
          contained = part.bounds.contains(hole.bounds) && part.area > -hole.area;
      if (contained && (containerArea === 0 || part.area < containerArea)) {
        containerArea = part.area;
        containerId = i;
      }
    }
    if (containerId == -1) {
      verbose("[groupPolygonRings()] polygon hole is missing a containing ring, dropping.");
    } else {
      output[containerId].push(hole);
    }
  });
  return output;
};

MapShaper.getPathMetadata = function(shape, arcs, type) {
  return (shape || []).map(function(ids) {
    if (!utils.isArray(ids)) throw new Error("expected array");
    return {
      ids: ids,
      area: type == 'polygon' ? geom.getPlanarPathArea(ids, arcs) : 0,
      bounds: arcs.getSimpleShapeBounds(ids)
    };
  });
};

MapShaper.quantizeArcs = function(arcs, quanta) {
  // Snap coordinates to a grid of @quanta locations on both axes
  // This may snap nearby points to the same coordinates.
  // Consider a cleanup pass to remove dupes, make sure collapsed arcs are
  //   removed on export.
  //
  var bb1 = arcs.getBounds(),
      bb2 = new Bounds(0, 0, quanta-1, quanta-1),
      fw = bb1.getTransform(bb2),
      inv = fw.invert();

  arcs.transformPoints(function(x, y) {
    var p = fw.transform(x, y);
    return inv.transform(Math.round(p[0]), Math.round(p[1]));
  });
};




// utility functions for datasets and layers

// clone all layers, make a filtered copy of arcs
MapShaper.copyDataset = function(dataset) {
  var d2 = utils.extend({}, dataset);
  d2.layers = d2.layers.map(MapShaper.copyLayer);
  if (d2.arcs) {
    d2.arcs = d2.arcs.getFilteredCopy();
  }
  return d2;
};

// clone coordinate data, shallow-copy attribute data
MapShaper.copyDatasetForExport = function(dataset) {
  var d2 = utils.extend({}, dataset);
  d2.layers = d2.layers.map(MapShaper.copyLayerShapes);
  if (d2.arcs) {
    d2.arcs = d2.arcs.getFilteredCopy();
  }
  return d2;
};

// make a stub copy if the no_replace option is given, else pass thru src layer
MapShaper.getOutputLayer = function(src, opts) {
  return opts && opts.no_replace ? {geometry_type: src.geometry_type} : src;
};

// Make a deep copy of a layer
MapShaper.copyLayer = function(lyr) {
  var copy = MapShaper.copyLayerShapes(lyr);
  if (copy.data) {
    copy.data = copy.data.clone();
  }
  return copy;
};

MapShaper.copyLayerShapes = function(lyr) {
  var copy = utils.extend({}, lyr);
    if (lyr.shapes) {
      copy.shapes = MapShaper.cloneShapes(lyr.shapes);
    }
    return copy;
};

MapShaper.getDatasetBounds = function(data) {
  var bounds = new Bounds();
  data.layers.forEach(function(lyr) {
    var lyrbb = MapShaper.getLayerBounds(lyr, data.arcs);
    if (lyrbb) bounds.mergeBounds(lyrbb);
  });
  return bounds;
};

MapShaper.datasetHasPaths = function(dataset) {
  return utils.some(dataset.layers, function(lyr) {
    return MapShaper.layerHasPaths(lyr);
  });
};

MapShaper.countMultiPartFeatures = function(shapes) {
  var count = 0;
  for (var i=0, n=shapes.length; i<n; i++) {
    if (shapes[i] && shapes[i].length > 1) count++;
  }
  return count;
};

MapShaper.getFeatureCount = function(lyr) {
  var count = 0;
  if (lyr.data) {
    count = lyr.data.size();
  } else if (lyr.shapes) {
    count = lyr.shapes.length;
  }
  return count;
};

MapShaper.getLayerBounds = function(lyr, arcs) {
  var bounds = null;
  if (lyr.geometry_type == 'point') {
    bounds = new Bounds();
    MapShaper.forEachPoint(lyr.shapes, function(p) {
      bounds.mergePoint(p[0], p[1]);
    });
  } else if (lyr.geometry_type == 'polygon' || lyr.geometry_type == 'polyline') {
    bounds = MapShaper.getPathBounds(lyr.shapes, arcs);
  } else {
    // just return null if layer has no bounds
    // error("Layer is missing a valid geometry type");
  }
  return bounds;
};

MapShaper.getPathBounds = function(shapes, arcs) {
  var bounds = new Bounds();
  MapShaper.forEachArcId(shapes, function(id) {
    arcs.mergeArcBounds(id, bounds);
  });
  return bounds;
};

// replace cut layers in-sequence (to maintain layer indexes)
// append any additional new layers
MapShaper.replaceLayers = function(dataset, cutLayers, newLayers) {
  // modify a copy in case cutLayers == dataset.layers
  var currLayers = dataset.layers.concat();
  utils.repeat(Math.max(cutLayers.length, newLayers.length), function(i) {
    var cutLyr = cutLayers[i],
        newLyr = newLayers[i],
        idx = cutLyr ? currLayers.indexOf(cutLyr) : currLayers.length;

    if (cutLyr) {
      currLayers.splice(idx, 1);
    }
    if (newLyr) {
      currLayers.splice(idx, 0, newLyr);
    }
  });
  dataset.layers = currLayers;
};

MapShaper.isolateLayer = function(layer, dataset) {
  return utils.defaults({
    layers: dataset.layers.filter(function(lyr) {return lyr == layer;})
  }, dataset);
};

// @target is a layer identifier or a comma-sep. list of identifiers
// an identifier is a literal name, a name containing "*" wildcard or
// a 0-based array index
MapShaper.findMatchingLayers = function(layers, target) {
  var ii = [];
  String(target).split(',').forEach(function(id) {
    var i = Number(id),
        rxp = utils.wildcardToRegExp(id);
    if (utils.isInteger(i)) {
      ii.push(i); // TODO: handle out-of-range index
    } else {
      layers.forEach(function(lyr, i) {
        if (rxp.test(lyr.name)) ii.push(i);
      });
    }
  });

  ii = utils.uniq(ii); // remove dupes
  return ii.map(function(i) {
    return layers[i];
  });
};

// Transform the points in a dataset in-place; don't clean up corrupted shapes
MapShaper.transformPoints = function(dataset, f) {
  if (dataset.arcs) {
    dataset.arcs.transformPoints(f);
  }
  dataset.layers.forEach(function(lyr) {
    if (MapShaper.layerHasPoints(lyr)) {
      MapShaper.transformPointsInLayer(lyr, f);
    }
  });
};

MapShaper.initDataTable = function(lyr) {
  lyr.data = new DataTable(MapShaper.getFeatureCount(lyr));
};




// Return average segment length (with simplification)
MapShaper.getAvgSegment = function(arcs) {
  var sum = 0;
  var count = arcs.forEachSegment(function(i, j, xx, yy) {
    var dx = xx[i] - xx[j],
        dy = yy[i] - yy[j];
    sum += Math.sqrt(dx * dx + dy * dy);
  });
  return sum / count || 0;
};

// Return average magnitudes of dx, dy (with simplification)
MapShaper.getAvgSegment2 = function(arcs) {
  var dx = 0, dy = 0;
  var count = arcs.forEachSegment(function(i, j, xx, yy) {
    dx += Math.abs(xx[i] - xx[j]);
    dy += Math.abs(yy[i] - yy[j]);
  });
  return [dx / count || 0, dy / count || 0];
};


// Return average magnitudes of dx, dy (with simplification)
/*
this.getAvgSegmentSph2 = function() {
  var sumx = 0, sumy = 0;
  var count = this.forEachSegment(function(i, j, xx, yy) {
    var lat1 = yy[i],
        lat2 = yy[j];
    sumy += geom.degreesToMeters(Math.abs(lat1 - lat2));
    sumx += geom.degreesToMeters(Math.abs(xx[i] - xx[j]) *
        Math.cos((lat1 + lat2) * 0.5 * geom.D2R);
  });
  return [sumx / count || 0, sumy / count || 0];
};
*/



// @xx array of x coords
// @ids an array of segment endpoint ids [a0, b0, a1, b1, ...]
// Sort @ids in place so that xx[a(n)] <= xx[b(n)] and xx[a(n)] <= xx[a(n+1)]
MapShaper.sortSegmentIds = function(xx, ids) {
  MapShaper.orderSegmentIds(xx, ids);
  MapShaper.quicksortSegmentIds(xx, ids, 0, ids.length-2);
};

MapShaper.orderSegmentIds = function(xx, ids, spherical) {
  function swap(i, j) {
    var tmp = ids[i];
    ids[i] = ids[j];
    ids[j] = tmp;
  }
  for (var i=0, n=ids.length; i<n; i+=2) {
    if (xx[ids[i]] > xx[ids[i+1]]) {
      swap(i, i+1);
    }
  }
};

MapShaper.insertionSortSegmentIds = function(arr, ids, start, end) {
  var id, id2;
  for (var j = start + 2; j <= end; j+=2) {
    id = ids[j];
    id2 = ids[j+1];
    for (var i = j - 2; i >= start && arr[id] < arr[ids[i]]; i-=2) {
      ids[i+2] = ids[i];
      ids[i+3] = ids[i+1];
    }
    ids[i+2] = id;
    ids[i+3] = id2;
  }
};

MapShaper.quicksortSegmentIds = function (a, ids, lo, hi) {
  var i = lo,
      j = hi,
      pivot, tmp;
  while (i < hi) {
    pivot = a[ids[(lo + hi >> 2) << 1]]; // avoid n^2 performance on sorted arrays
    while (i <= j) {
      while (a[ids[i]] < pivot) i+=2;
      while (a[ids[j]] > pivot) j-=2;
      if (i <= j) {
        tmp = ids[i];
        ids[i] = ids[j];
        ids[j] = tmp;
        tmp = ids[i+1];
        ids[i+1] = ids[j+1];
        ids[j+1] = tmp;
        i+=2;
        j-=2;
      }
    }

    if (j - lo < 40) MapShaper.insertionSortSegmentIds(a, ids, lo, j);
    else MapShaper.quicksortSegmentIds(a, ids, lo, j);
    if (hi - i < 40) {
      MapShaper.insertionSortSegmentIds(a, ids, i, hi);
      return;
    }
    lo = i;
    j = hi;
  }
};




// Convert an array of intersections into an ArcCollection (for display)
//
MapShaper.getIntersectionPoints = function(intersections) {
  return intersections.map(function(obj) {
        return [obj.x, obj.y];
      });
};

// Identify intersecting segments in an ArcCollection
//
// To find all intersections:
// 1. Assign each segment to one or more horizontal stripes/bins
// 2. Find intersections inside each stripe
// 3. Concat and dedup
//
MapShaper.findSegmentIntersections = (function() {

  // Re-use buffer for temp data -- Chrome's gc starts bogging down
  // if large buffers are repeatedly created.
  var buf;
  function getUint32Array(count) {
    var bytes = count * 4;
    if (!buf || buf.byteLength < bytes) {
      buf = new ArrayBuffer(bytes);
    }
    return new Uint32Array(buf, 0, count);
  }

  return function(arcs) {
    var bounds = arcs.getBounds(),
        // TODO: handle spherical bounds
        spherical = !arcs.isPlanar() &&
            containsBounds(MapShaper.getWorldBounds(), bounds.toArray()),
        ymin = bounds.ymin,
        yrange = bounds.ymax - ymin,
        stripeCount = MapShaper.calcSegmentIntersectionStripeCount(arcs),
        stripeSizes = new Uint32Array(stripeCount),
        stripeId = stripeCount > 1 ? multiStripeId : singleStripeId,
        i;

    function multiStripeId(y) {
      return Math.floor((stripeCount-1) * (y - ymin) / yrange);
    }

    function singleStripeId(y) {return 0;}

    // Count segments in each stripe
    arcs.forEachSegment(function(id1, id2, xx, yy) {
      var s1 = stripeId(yy[id1]),
          s2 = stripeId(yy[id2]);
      while (true) {
        stripeSizes[s1] = stripeSizes[s1] + 2;
        if (s1 == s2) break;
        s1 += s2 > s1 ? 1 : -1;
      }
    });

    // Allocate arrays for segments in each stripe
    var stripeData = getUint32Array(utils.sum(stripeSizes)),
        offs = 0;
    var stripes = [];
    utils.forEach(stripeSizes, function(stripeSize) {
      var start = offs;
      offs += stripeSize;
      stripes.push(stripeData.subarray(start, offs));
    });
    // Assign segment ids to each stripe
    utils.initializeArray(stripeSizes, 0);

    arcs.forEachSegment(function(id1, id2, xx, yy) {
      var s1 = stripeId(yy[id1]),
          s2 = stripeId(yy[id2]),
          count, stripe;
      while (true) {
        count = stripeSizes[s1];
        stripeSizes[s1] = count + 2;
        stripe = stripes[s1];
        stripe[count] = id1;
        stripe[count+1] = id2;
        if (s1 == s2) break;
        s1 += s2 > s1 ? 1 : -1;
      }
    });

    // Detect intersections among segments in each stripe.
    var raw = arcs.getVertexData(),
        intersections = [],
        arr;
    for (i=0; i<stripeCount; i++) {
      arr = MapShaper.intersectSegments(stripes[i], raw.xx, raw.yy, spherical);
      if (arr.length > 0) {
        intersections.push.apply(intersections, arr);
      }
    }
    return MapShaper.dedupIntersections(intersections);
  };
})();

MapShaper.sortIntersections = function(arr) {
  arr.sort(function(a, b) {
    return a.x - b.x || a.y - b.y;
  });
};

MapShaper.dedupIntersections = function(arr) {
  var index = {};
  return arr.filter(function(o) {
    var key = MapShaper.getIntersectionKey(o);
    if (key in index) {
      return false;
    }
    index[key] = true;
    return true;
  });
};

// Get an indexable key from an intersection object
// Assumes that vertex ids of o.a and o.b are sorted
MapShaper.getIntersectionKey = function(o) {
  return o.a.join(',') + ';' + o.b.join(',');
};

MapShaper.calcSegmentIntersectionStripeCount = function(arcs) {
  var yrange = arcs.getBounds().height(),
      segLen = MapShaper.getAvgSegment2(arcs)[1],
      count = 1;
  if (segLen > 0 && yrange > 0) {
    count = Math.ceil(yrange / segLen / 20);
  }
  return count || 1;
};

// Find intersections among a group of line segments
//
// TODO: handle case where a segment starts and ends at the same point (i.e. duplicate coords);
//
// @ids: Array of indexes: [s0p0, s0p1, s1p0, s1p1, ...] where xx[sip0] <= xx[sip1]
// @xx, @yy: Arrays of x- and y-coordinates
//
MapShaper.intersectSegments = function(ids, xx, yy, spherical) {
  var lim = ids.length - 2,
      intersections = [];
  var s1p1, s1p2, s2p1, s2p2,
      s1p1x, s1p2x, s2p1x, s2p2x,
      s1p1y, s1p2y, s2p1y, s2p2y,
      hit, seg1, seg2, i, j;

  // Sort segments by xmin, to allow efficient exclusion of segments with
  // non-overlapping x extents.
  MapShaper.sortSegmentIds(xx, ids); // sort by ascending xmin

  i = 0;
  while (i < lim) {
    s1p1 = ids[i];
    s1p2 = ids[i+1];
    s1p1x = xx[s1p1];
    s1p2x = xx[s1p2];
    s1p1y = yy[s1p1];
    s1p2y = yy[s1p2];
    // count++;

    j = i;
    while (j < lim) {
      j += 2;
      s2p1 = ids[j];
      s2p1x = xx[s2p1];

      if (s1p2x < s2p1x) break; // x extent of seg 2 is greater than seg 1: done with seg 1
      //if (s1p2x <= s2p1x) break; // this misses point-segment intersections when s1 or s2 is vertical

      s2p1y = yy[s2p1];
      s2p2 = ids[j+1];
      s2p2x = xx[s2p2];
      s2p2y = yy[s2p2];

      // skip segments with non-overlapping y ranges
      if (s1p1y >= s2p1y) {
        if (s1p1y > s2p2y && s1p2y > s2p1y && s1p2y > s2p2y) continue;
      } else {
        if (s1p1y < s2p2y && s1p2y < s2p1y && s1p2y < s2p2y) continue;
      }

      // skip segments that are adjacent in a path (optimization)
      // TODO: consider if this eliminates some cases that should
      // be detected, e.g. spikes formed by unequal segments
      if (s1p1 == s2p1 || s1p1 == s2p2 || s1p2 == s2p1 || s1p2 == s2p2) {
        continue;
      }

      // test two candidate segments for intersection
      hit = segmentIntersection(s1p1x, s1p1y, s1p2x, s1p2y,
          s2p1x, s2p1y, s2p2x, s2p2y);
      if (hit) {
        seg1 = [s1p1, s1p2];
        seg2 = [s2p1, s2p2];
        intersections.push(MapShaper.formatIntersection(hit, seg1, seg2, xx, yy));
        if (hit.length == 4) {
          intersections.push(MapShaper.formatIntersection(hit.slice(2), seg1, seg2, xx, yy));
        }
      }
    }
    i += 2;
  }
  return intersections;

  // @p is an [x, y] location along a segment defined by ids @id1 and @id2
  // return array [i, j] where i and j are the same endpoint ids with i <= j
  // if @p coincides with an endpoint, return the id of that endpoint twice
  function getEndpointIds(id1, id2, p) {
    var i = id1 < id2 ? id1 : id2,
        j = i === id1 ? id2 : id1;
    if (xx[i] == p[0] && yy[i] == p[1]) {
      j = i;
    } else if (xx[j] == p[0] && yy[j] == p[1]) {
      i = j;
    }
    return [i, j];
  }
};

MapShaper.formatIntersection = function(xy, s1, s2, xx, yy) {
  var x = xy[0],
      y = xy[1],
      a, b;
  s1 = MapShaper.formatIntersectingSegment(x, y, s1[0], s1[1], xx, yy);
  s2 = MapShaper.formatIntersectingSegment(x, y, s2[0], s2[1], xx, yy);
  a = s1[0] < s2[0] ? s1 : s2;
  b = a == s1 ? s2 : s1;
  return {x: x, y: y, a: a, b: b};
};

MapShaper.formatIntersectingSegment = function(x, y, id1, id2, xx, yy) {
  var i = id1 < id2 ? id1 : id2,
      j = i === id1 ? id2 : id1;
  if (xx[i] == x && yy[i] == y) {
    j = i;
  } else if (xx[j] == x && yy[j] == y) {
    i = j;
  }
  return [i, j];
};




// Calculations for planar geometry of shapes
// TODO: consider 3D versions of some of these

geom.getPlanarShapeArea = function(shp, arcs) {
  return (shp || []).reduce(function(area, ids) {
    return area + geom.getPlanarPathArea(ids, arcs);
  }, 0);
};

geom.getSphericalShapeArea = function(shp, arcs) {
  if (arcs.isPlanar()) {
    error("[getSphericalShapeArea()] Function requires decimal degree coordinates");
  }
  return (shp || []).reduce(function(area, ids) {
    return area + geom.getSphericalPathArea(ids, arcs);
  }, 0);
};

// Return path with the largest (area) bounding box
// @shp array of array of arc ids
// @arcs ArcCollection
geom.getMaxPath = function(shp, arcs) {
  var maxArea = 0;
  return (shp || []).reduce(function(maxPath, path) {
    var bbArea = arcs.getSimpleShapeBounds(path).area();
    if (bbArea > maxArea) {
      maxArea = bbArea;
      maxPath = path;
    }
    return maxPath;
  }, null);
};

// @ids array of arc ids
// @arcs ArcCollection
geom.getAvgPathXY = function(ids, arcs) {
  var iter = arcs.getShapeIter(ids);
  if (!iter.hasNext()) return null;
  var x0 = iter.x,
      y0 = iter.y,
      count = 0,
      sumX = 0,
      sumY = 0;
  while (iter.hasNext()) {
    count++;
    sumX += iter.x;
    sumY += iter.y;
  }
  if (count === 0 || iter.x !== x0 || iter.y !== y0) {
    sumX += x0;
    sumY += y0;
    count++;
  }
  return {
    x: sumX / count,
    y: sumY / count
  };
};

// Return true if point is inside or on boundary of a shape
//
geom.testPointInPolygon = function(x, y, shp, arcs) {
  var isIn = false,
      isOn = false;
  if (shp) {
    shp.forEach(function(ids) {
      var inRing = geom.testPointInRing(x, y, ids, arcs);
      if (inRing == 1) {
        isIn = !isIn;
      } else if (inRing == -1) {
        isOn = true;
      }
    });
  }
  return isOn || isIn;
};


geom.getPointToPathDistance = function(px, py, ids, arcs) {
  var iter = arcs.getShapeIter(ids);
  if (!iter.hasNext()) return Infinity;
  var ax = iter.x,
      ay = iter.y,
      paSq = distanceSq(px, py, ax, ay),
      pPathSq = paSq,
      pbSq, abSq,
      bx, by;

  while (iter.hasNext()) {
    bx = iter.x;
    by = iter.y;
    pbSq = distanceSq(px, py, bx, by);
    abSq = distanceSq(ax, ay, bx, by);
    pPathSq = Math.min(pPathSq, apexDistSq(paSq, pbSq, abSq));
    ax = bx;
    ay = by;
    paSq = pbSq;
  }
  return Math.sqrt(pPathSq);
};

geom.getYIntercept = function(x, ax, ay, bx, by) {
  return ay + (x - ax) * (by - ay) / (bx - ax);
};

geom.getXIntercept = function(y, ax, ay, bx, by) {
  return ax + (y - ay) * (bx - ax) / (by - ay);
};

// Return unsigned distance of a point to a shape
//
geom.getPointToShapeDistance = function(x, y, shp, arcs) {
  var minDist = (shp || []).reduce(function(minDist, ids) {
    var pathDist = geom.getPointToPathDistance(x, y, ids, arcs);
    return Math.min(minDist, pathDist);
  }, Infinity);
  return minDist;
};

// Test if point (x, y) is inside, outside or on the boundary of a polygon ring
// Return 0: outside; 1: inside; -1: on boundary
//
geom.testPointInRing = function(x, y, ids, arcs) {
  /*
  // arcs.getSimpleShapeBounds() doesn't apply simplification, can't use here
  //// wait, why not? simplifcation shoudn't expand bounds, so this test makes sense
  if (!arcs.getSimpleShapeBounds(ids).containsPoint(x, y)) {
    return false;
  }
  */
  var isIn = false,
      isOn = false;
  MapShaper.forEachPathSegment(ids, arcs, function(a, b, xx, yy) {
    var result = geom.testRayIntersection(x, y, xx[a], yy[a], xx[b], yy[b]);
    if (result == 1) {
      isIn = !isIn;
    } else if (isNaN(result)) {
      isOn = true;
    }
  });
  return isOn ? -1 : (isIn ? 1 : 0);
};

// test if a vertical ray originating at (x, y) intersects a segment
// returns 1 if intersection, 0 if no intersection, NaN if point touches segment
// (Special rules apply to endpoint intersections, to support point-in-polygon testing.)
geom.testRayIntersection = function(x, y, ax, ay, bx, by) {
  var val = geom.getRayIntersection(x, y, ax, ay, bx, by);
  if (val != val) {
    return NaN;
  }
  return val == -Infinity ? 0 : 1;
};

geom.getRayIntersection = function(x, y, ax, ay, bx, by) {
  var hit = -Infinity, // default: no hit
      yInt;

  // case: p is entirely above, left or right of segment
  if (x < ax && x < bx || x > ax && x > bx || y > ay && y > by) {
      // no intersection
  }
  // case: px aligned with a segment vertex
  else if (x === ax || x === bx) {
    // case: vertical segment or collapsed segment
    if (x === ax && x === bx) {
      // p is on segment
      if (y == ay || y == by || y > ay != y > by) {
        hit = NaN;
      }
      // else: no hit
    }
    // case: px equal to ax (only)
    else if (x === ax) {
      if (y === ay) {
        hit = NaN;
      } else if (bx < ax && y < ay) {
        // only score hit if px aligned to rightmost endpoint
        hit = ay;
      }
    }
    // case: px equal to bx (only)
    else {
      if (y === by) {
        hit = NaN;
      } else if (ax < bx && y < by) {
        // only score hit if px aligned to rightmost endpoint
        hit = by;
      }
    }
  // case: px is between endpoints
  } else {
    yInt = geom.getYIntercept(x, ax, ay, bx, by);
    if (yInt > y) {
      hit = yInt;
    } else if (yInt == y) {
      hit = NaN;
    }
  }
  return hit;
};

geom.getSphericalPathArea = function(ids, arcs) {
  var iter = arcs.getShapeIter(ids),
      sum = 0,
      started = false,
      deg2rad = Math.PI / 180,
      x, y, xp, yp;
  while (iter.hasNext()) {
    x = iter.x * deg2rad;
    y = Math.sin(iter.y * deg2rad);
    if (started) {
      sum += (x - xp) * (2 + y + yp);
    } else {
      started = true;
    }
    xp = x;
    yp = y;
  }
  return sum / 2 * 6378137 * 6378137;
};

// Get path area from an array of [x, y] points
// TODO: consider removing duplication with getPathArea(), e.g. by
//   wrapping points in an iterator.
//
geom.getPlanarPathArea2 = function(points) {
  var sum = 0,
      ax, ay, bx, by, dx, dy, p;
  for (var i=0, n=points.length; i<n; i++) {
    p = points[i];
    if (i === 0) {
      ax = 0;
      ay = 0;
      dx = -p[0];
      dy = -p[1];
    } else {
      ax = p[0] + dx;
      ay = p[1] + dy;
      sum += ax * by - bx * ay;
    }
    bx = ax;
    by = ay;
  }
  return sum / 2;
};

geom.getPlanarPathArea = function(ids, arcs) {
  var iter = arcs.getShapeIter(ids),
      sum = 0,
      ax, ay, bx, by, dx, dy;
  if (iter.hasNext()) {
    ax = 0;
    ay = 0;
    dx = -iter.x;
    dy = -iter.y;
    while (iter.hasNext()) {
      bx = ax;
      by = ay;
      ax = iter.x + dx;
      ay = iter.y + dy;
      sum += ax * by - bx * ay;
    }
  }
  return sum / 2;
};

geom.countVerticesInPath = function(ids, arcs) {
  var iter = arcs.getShapeIter(ids),
      count = 0;
  while (iter.hasNext()) count++;
  return count;
};

geom.getPathBounds = function(points) {
  var bounds = new Bounds();
  for (var i=0, n=points.length; i<n; i++) {
    bounds.mergePoint(points[i][0], points[i][1]);
  }
  return bounds;
};

geom.transposePoints = function(points) {
  var xx = [], yy = [], n=points.length;
  for (var i=0; i<n; i++) {
    xx.push(points[i][0]);
    yy.push(points[i][1]);
  }
  return [xx, yy];
};

geom.calcPathLen = (function() {
  var len;
  function addSegLen(i, j, xx, yy) {
    len += distance2D(xx[i], yy[i], xx[j], yy[j]);
  }
  return function(path, arcs) {
    len = 0;
    for (var i=0, n=path.length; i<n; i++) {
      arcs.forEachArcSegment(path[i], addSegLen);
    }
    return len;
  };
}());




// PolygonIndex indexes the coordinates in one polygon feature for efficient
// point-in-polygon tests

function PolygonIndex(shape, arcs, opts) {
  var data = arcs.getVertexData(),
      polygonBounds = arcs.getMultiShapeBounds(shape),
      boundsLeft,
      xminIds, xmaxIds, // vertex ids of segment endpoints
      bucketCount,
      bucketOffsets,
      bucketWidth;

  init();

  // Return 0 if outside, 1 if inside, -1 if on boundary
  this.pointInPolygon = function(x, y) {
    if (!polygonBounds.containsPoint(x, y)) {
      return false;
    }
    var bucketId = getBucketId(x);
    var count = countCrosses(x, y, bucketId);
    if (bucketId > 0) {
      count += countCrosses(x, y, bucketId - 1);
    }
    count += countCrosses(x, y, bucketCount); // check oflo bucket
    if (isNaN(count)) return -1;
    return count % 2 == 1 ? 1 : 0;
  };

  function countCrosses(x, y, bucketId) {
    var offs = bucketOffsets[bucketId],
        count = 0,
        xx = data.xx,
        yy = data.yy,
        n, a, b;
    if (bucketId == bucketCount) { // oflo bucket
      n = xminIds.length - offs;
    } else {
      n = bucketOffsets[bucketId + 1] - offs;
    }
    for (var i=0; i<n; i++) {
      a = xminIds[i + offs];
      b = xmaxIds[i + offs];
      count += geom.testRayIntersection(x, y, xx[a], yy[a], xx[b], yy[b]);
    }
    return count;
  }

  function getBucketId(x) {
    var i = Math.floor((x - boundsLeft) / bucketWidth);
    if (i < 0) i = 0;
    if (i >= bucketCount) i = bucketCount - 1;
    return i;
  }

  function getBucketCount(segCount) {
    // default is 100 segs per bucket (average)
    var buckets = opts && opts.buckets > 0 ? opts.buckets : segCount / 100;
    return Math.ceil(buckets);
  }

  function init() {
    var xx = data.xx,
        segCount = 0,
        segId = 0,
        bucketId = -1,
        prevBucketId,
        segments,
        head, tail,
        a, b, i, j, xmin, xmax;

    // get array of segments as [s0p0, s0p1, s1p0, s1p1, ...], sorted by xmin coordinate
    MapShaper.forEachPathSegment(shape, arcs, function() {
      segCount++;
    });
    segments = new Uint32Array(segCount * 2);
    i = 0;
    MapShaper.forEachPathSegment(shape, arcs, function(a, b, xx, yy) {
      segments[i++] = a;
      segments[i++] = b;
    });
    MapShaper.sortSegmentIds(xx, segments);

    // assign segments to buckets according to xmin coordinate
    xminIds = new Uint32Array(segCount);
    xmaxIds = new Uint32Array(segCount);
    bucketCount = getBucketCount(segCount);
    bucketOffsets = new Uint32Array(bucketCount + 1); // add an oflo bucket
    boundsLeft = xx[segments[0]]; // xmin of first segment
    bucketWidth = (xx[segments[segments.length - 2]] - boundsLeft) / bucketCount;
    head = 0; // insertion index for next segment in the current bucket
    tail = segCount - 1; // insertion index for next segment in oflo bucket

    while (segId < segCount) {
      j = segId * 2;
      a = segments[j];
      b = segments[j+1];
      xmin = xx[a];
      xmax = xx[b];
      prevBucketId = bucketId;
      bucketId = getBucketId(xmin);

      while (bucketId > prevBucketId) {
        prevBucketId++;
        bucketOffsets[prevBucketId] = head;
      }

      if (xmax - xmin >= 0 === false) error("Invalid segment");
      if (getBucketId(xmax) - bucketId > 1) {
        // if segment extends to more than two buckets, put it in the oflo bucket
        xminIds[tail] = a;
        xmaxIds[tail] = b;
        tail--; // oflo bucket fills from right to left
      } else {
        // else place segment in a bucket based on x coord of leftmost endpoint
        xminIds[head] = a;
        xmaxIds[head] = b;
        head++;
      }
      segId++;
    }
    bucketOffsets[bucketCount] = head;
    if (head != tail + 1) error("Segment indexing error");
  }
}




function PathIndex(shapes, arcs) {
  var _index;
  // var totalArea = arcs.getBounds().area();
  var totalArea = MapShaper.getPathBounds(shapes, arcs).area();
  init(shapes);

  function init(shapes) {
    var boxes = [];

    shapes.forEach(function(shp, shpId) {
      var n = shp ? shp.length : 0;
      for (var i=0; i<n; i++) {
        addPath(shp[i], shpId);
      }
    });

    _index = require('rbush')();
    _index.load(boxes);

    function addPath(ids, shpId) {
      var bounds = arcs.getSimpleShapeBounds(ids);
      var bbox = bounds.toArray();
      bbox.ids = ids;
      bbox.bounds = bounds;
      bbox.id = shpId;
      boxes.push(bbox);
      // TODO: Better test for whether or not to index a path
      if (bounds.area() > totalArea * 0.02) {
        bbox.index = new PolygonIndex([ids], arcs);
      }
    }
  }

  this.findEnclosingShape = function(p) {
    var shpId = -1;
    var shapes = findPointHitShapes(p);
    shapes.forEach(function(paths) {
      if (testPointInRings(p, paths)) {
        shpId = paths[0].id;
      }
    });
    return shpId;
  };

  this.pointIsEnclosed = function(p) {
    return testPointInRings(p, findPointHitRings(p));
  };

  this.arcIsEnclosed = function(arcId) {
    return this.pointIsEnclosed(getTestPoint(arcId));
  };

  // Test if a polygon ring is contained within an indexed ring
  // Not a true polygon-in-polygon test
  // Assumes that the target ring does not cross an indexed ring at any point
  // or share a segment with an indexed ring. (Intersecting rings should have
  // been detected previously).
  //
  this.pathIsEnclosed = function(pathIds) {
    var arcId = pathIds[0];
    var p = getTestPoint(arcId);
    return this.pointIsEnclosed(p);
  };

  // return array of paths that are contained within a path, or null if none
  // @pathIds Array of arc ids comprising a closed path
  this.findEnclosedPaths = function(pathIds) {
    var pathBounds = arcs.getSimpleShapeBounds(pathIds),
        cands = _index.search(pathBounds.toArray()),
        paths = [],
        index;

    if (cands.length > 6) {
      index = new PolygonIndex([pathIds], arcs);
    }


    cands.forEach(function(cand) {
      var p = getTestPoint(cand.ids[0]);
      var isEnclosed = index ?
        index.pointInPolygon(p[0], p[1]) : pathContainsPoint(pathIds, pathBounds, p);
      if (isEnclosed) {
        paths.push(cand.ids);
      }
    });
    return paths.length > 0 ? paths : null;
  };

  this.findPathsInsideShape = function(shape) {
    var paths = [];
    shape.forEach(function(ids) {
      var enclosed = this.findEnclosedPaths(ids);
      if (enclosed) {
        paths = xorArrays(paths, enclosed);
      }
    }, this);
    return paths.length > 0 ? paths : null;
  };

  function testPointInRings(p, cands) {
    var isOn = false,
        isIn = false;
    cands.forEach(function(cand) {
      var inRing = cand.index ?
        cand.index.pointInPolygon(p[0], p[1]) :
        pathContainsPoint(cand.ids, cand.bounds, p);
      if (inRing == -1) {
        isOn = true;
      } else if (inRing == 1) {
        isIn = !isIn;
      }
    });
    return isOn || isIn;
  }

  function findPointHitShapes(p) {
    var rings = findPointHitRings(p),
        shapes = [],
        shape, bbox;
    if (rings.length > 0) {
      rings.sort(function(a, b) {return a.id - b.id;});
      for (var i=0; i<rings.length; i++) {
        bbox = rings[i];
        if (i === 0 || bbox.id != rings[i-1].id) {
          shapes.push(shape=[]);
        }
        shape.push(bbox);
      }
    }
    return shapes;
  }

  function findPointHitRings(p) {
    var x = p[0],
        y = p[1];
    return _index.search([x, y, x, y]);
  }

  function getTestPoint(arcId) {
    // test point halfway along first segment because ring might still be
    // enclosed if a segment endpoint touches an indexed ring.
    var p0 = arcs.getVertex(arcId, 0),
        p1 = arcs.getVertex(arcId, 1);
    return [(p0.x + p1.x) / 2, (p0.y + p1.y) / 2];
  }

  function pathContainsPoint(pathIds, pathBounds, p) {
    if (pathBounds.containsPoint(p[0], p[1]) === false) return 0;
    // A contains B iff some point on B is inside A
    return geom.testPointInRing(p[0], p[1], pathIds, arcs);
  }

  function xorArrays(a, b) {
    var xor = [];
    a.forEach(function(el) {
      if (b.indexOf(el) == -1) xor.push(el);
    });
    b.forEach(function(el) {
      if (xor.indexOf(el) == -1) xor.push(el);
    });
    return xor;
  }
}




// @arcs ArcCollection
// @filter Optional filter function, arcIds that return false are excluded
//
function NodeCollection(arcs, filter) {
  if (utils.isArray(arcs)) {
    arcs = new ArcCollection(arcs);
  }
  var arcData = arcs.getVertexData(),
      nn = arcData.nn,
      xx = arcData.xx,
      yy = arcData.yy;

  var nodeData = MapShaper.findNodeTopology(arcs, filter);

  if (nn.length * 2 != nodeData.chains.length) error("[NodeCollection] count error");

  // TODO: could check that arc collection hasn't been modified, using accessor function
  Object.defineProperty(this, 'arcs', {value: arcs});

  this.toArray = function() {
    var flags = new Uint8Array(nodeData.xx.length),
        nodes = [];
    utils.forEach(nodeData.chains, function(next, i) {
      if (flags[i] == 1) return;
      nodes.push([nodeData.xx[i], nodeData.yy[i]]);
      while (flags[next] != 1) {
        flags[next] = 1;
        next = nodeData.chains[next];
      }
    });
    return nodes;
  };

  this.size = function() {
    return this.toArray().length;
  };

  this.debugNode = function(arcId) {
    if (!MapShaper.TRACING) return;
    var ids = [arcId];
    this.forEachConnectedArc(arcId, function(id) {
      ids.push(id);
    });

    message("node ids:",  ids);
    ids.forEach(printArc);

    function printArc(id) {
      var str = id + ": ";
      var len = arcs.getArcLength(id);
      if (len > 0) {
        var p1 = arcs.getVertex(id, -1);
        str += utils.format("[%f, %f]", p1.x, p1.y);
        if (len > 1) {
          var p2 = arcs.getVertex(id, -2);
          str += utils.format(", [%f, %f]", p2.x, p2.y);
          if (len > 2) {
            var p3 = arcs.getVertex(id, 0);
            str += utils.format(", [%f, %f]", p3.x, p3.y);
          }
          str += " len: " + distance2D(p1.x, p1.y, p2.x, p2.y);
        }
      } else {
        str = "[]";
      }
      message(str);
    }
  };

  this.forEachConnectedArc = function(arcId, cb) {
    var nextId = nextConnectedArc(arcId),
        i = 0;
    while (nextId != arcId) {
      cb(nextId, i++);
      nextId = nextConnectedArc(nextId);
    }
  };

  // Returns the id of the first identical arc or @arcId if none found
  // TODO: find a better function name
  this.findMatchingArc = function(arcId) {
    var verbose = arcId ==  -12794 || arcId == 19610;
    var nextId = nextConnectedArc(arcId),
        match = arcId;
    while (nextId != arcId) {
      if (testArcMatch(arcId, nextId)) {
        if (absArcId(nextId) < absArcId(match)) match = nextId;
      }
      nextId = nextConnectedArc(nextId);
    }
    if (match != arcId) {
      trace("found identical arc:", arcId, "->", match);
      // this.debugNode(arcId);
    }
    return match;
  };

  function testArcMatch(a, b) {
    var absA = a >= 0 ? a : ~a,
        absB = b >= 0 ? b : ~b,
        lenA = nn[absA];
    if (lenA < 2) {
      // Don't throw error on collapsed arcs -- assume they will be handled
      //   appropriately downstream.
      // error("[testArcMatch() defective arc; len:", lenA);
      return false;
    }
    if (lenA != nn[absB]) return false;
    if (testVertexMatch(a, b, -1) &&
        testVertexMatch(a, b, 1) &&
        testVertexMatch(a, b, -2)) {
      return true;
    }
    return false;
  }

  function testVertexMatch(a, b, i) {
    var ai = arcs.indexOfVertex(a, i),
        bi = arcs.indexOfVertex(b, i);
    return xx[ai] == xx[bi] && yy[ai] == yy[bi];
  }

  // return arcId of next arc in the chain, pointed towards the shared vertex
  function nextConnectedArc(arcId) {
    var fw = arcId >= 0,
        absId = fw ? arcId : ~arcId,
        nodeId = fw ? absId * 2 + 1: absId * 2, // if fw, use end, if rev, use start
        chainedId = nodeData.chains[nodeId],
        nextAbsId = chainedId >> 1,
        nextArcId = chainedId & 1 == 1 ? nextAbsId : ~nextAbsId;

    if (chainedId < 0 || chainedId >= nodeData.chains.length) error("out-of-range chain id");
    if (absId >= nn.length) error("out-of-range arc id");
    if (nodeData.chains.length <= nodeId) error("out-of-bounds node id");
    return nextArcId;
  }

  // expose for testing
  this.internal = {
    testArcMatch: testArcMatch,
    testVertexMatch: testVertexMatch
  };
}

MapShaper.findNodeTopology = function(arcs, filter) {
  var n = arcs.size() * 2,
      xx2 = new Float64Array(n),
      yy2 = new Float64Array(n),
      ids2 = new Int32Array(n);

  arcs.forEach2(function(i, n, xx, yy, zz, arcId) {
    if (filter && !filter(arcId)) {
      return;
    }
    var start = i,
        end = i + n - 1,
        start2 = arcId * 2,
        end2 = start2 + 1;
    xx2[start2] = xx[start];
    yy2[start2] = yy[start];
    ids2[start2] = arcId;
    xx2[end2] = xx[end];
    yy2[end2] = yy[end];
    ids2[end2] = arcId;
  });

  var chains = initPointChains(xx2, yy2);
  return {
    xx: xx2,
    yy: yy2,
    ids: ids2,
    chains: chains
  };
};




// Return function for splitting self-intersecting polygon rings
// Returned function receives a single path, returns an array of paths
// Assumes that any intersections occur at vertices, not along segments
// (requires that MapShaper.divideArcs() has already been run)
//
MapShaper.getSelfIntersectionSplitter = function(nodes) {

  function contains(arr, el) {
    for (var i=0, n=arr.length; i<n; i++) {
      if (arr[i] === el) return true;
    }
    return false;
  }

  // If arc @enterId enters a node with more than one open routes leading out:
  //   return array of sub-paths
  // else return null
  function dividePathAtNode(path, enterId) {
    var count = 0,
        subPaths = null,
        exitIds, firstExitId;
    nodes.forEachConnectedArc(enterId, function(arcId) {
      var exitId = ~arcId;
      // TODO: remove performance bottleneck
      // contains() is faster than native array.indexOf(), could do better.
      // if (path.indexOf(exitId) > -1) { // ignore arcs that are not on this path
      if (contains(path, exitId)) { // ignore arcs that are not on this path
        if (count === 0) {
          firstExitId = exitId;
        } else if (count === 1) {
          exitIds = [firstExitId, exitId];
        } else {
          exitIds.push(exitId);
        }
        count++;
      }
    });
    if (exitIds) {
      subPaths = MapShaper.splitPathByIds(path, exitIds);
      // recursively divide each sub-path
      return subPaths.reduce(function(memo, subPath) {
        return memo.concat(dividePath(subPath));
      }, []);
    }
    return null;
  }

  function dividePath(path) {
    var subPaths = null;
    for (var i=0; i<path.length - 1; i++) { // don't need to check last arc
      subPaths = dividePathAtNode(path, path[i]);
      if (subPaths) {
        return subPaths;
      }
    }
    // indivisible path -- remove any spikes
    MapShaper.removeSpikesInPath(path);
    return path.length > 0 ? [path] : [];
  }

  return dividePath;
};

// @path An array of arc ids
// @ids An array of two or more start ids
MapShaper.splitPathByIds = function(path, ids) {
  var n = ids.length;
  var ii = ids.map(function(id) {
    var idx = path.indexOf(id);
    if (idx == -1) error("[splitPathByIds()] Path is missing id:", id);
    return idx;
  });
  utils.genericSort(ii, true);
  var subPaths = ii.map(function(idx, i) {
    var split;
    if (i == n-1) {
      // place first path item first
      split = path.slice(0, ii[0]).concat(path.slice(idx));
    } else {
      split = path.slice(idx, ii[i+1]);
    }
    return split;
  });

  // make sure first sub-path starts with arc at path[0]
  if (ii[0] !== 0) {
    subPaths.unshift(subPaths.pop());
  }
  if (subPaths[0][0] !== path[0]) {
    error("[splitPathByIds()] Indexing error");
  }
  return subPaths;
};




// Functions for redrawing polygons for clipping / erasing / flattening / division

MapShaper.setBits = function(src, flags, mask) {
  return (src & ~mask) | (flags & mask);
};

MapShaper.andBits = function(src, flags, mask) {
  return src & (~mask | flags);
};

MapShaper.setRouteBits = function(bits, id, flags) {
  var abs = absArcId(id),
      mask;
  if (abs == id) { // fw
    mask = ~3;
  } else {
    mask = ~0x30;
    bits = bits << 4;
  }
  flags[abs] &= (bits | mask);
};

MapShaper.getRouteBits = function(id, flags) {
  var abs = absArcId(id),
      bits = flags[abs];
  if (abs != id) bits = bits >> 4;
  return bits & 7;
};


// enable arc pathways in a single shape or array of shapes
// Uses 8 bits to control traversal of each arc
// 0-3: forward arc; 4-7: rev arc
// 0: fw path is visible
// 1: fw path is open for traversal
// ...
//
MapShaper.openArcRoutes = function(arcIds, arcs, flags, fwd, rev, dissolve, orBits) {
  MapShaper.forEachArcId(arcIds, function(id) {
    var isInv = id < 0,
        absId = isInv ? ~id : id,
        currFlag = flags[absId],
        openFwd = isInv ? rev : fwd,
        openRev = isInv ? fwd : rev,
        newFlag = currFlag;

    // error condition: lollipop arcs can cause problems; ignore these
    if (arcs.arcIsLollipop(id)) {
      trace('lollipop');
      newFlag = 0; // unset (i.e. make invisible)
    } else {
      if (openFwd) {
        newFlag |= 3; // visible / open
      }
      if (openRev) {
        newFlag |= 0x30; // visible / open
      }

      // placing this in front of dissolve - dissolve has to be able to hide
      // arcs that are set to visible
      if (orBits > 0) {
        newFlag |= orBits;
      }

      // dissolve hides arcs that have both fw and rev pathways open
      if (dissolve && (newFlag & 0x22) === 0x22) {
        newFlag &= ~0x11; // make invisible
      }
    }

    flags[absId] = newFlag;
  });
};

MapShaper.closeArcRoutes = function(arcIds, arcs, flags, fwd, rev, hide) {
  MapShaper.forEachArcId(arcIds, function(id) {
    var isInv = id < 0,
        absId = isInv ? ~id : id,
        currFlag = flags[absId],
        mask = 0xff,
        closeFwd = isInv ? rev : fwd,
        closeRev = isInv ? fwd : rev;

    if (closeFwd) {
      if (hide) mask &= ~1;
      mask ^= 0x2;
    }
    if (closeRev) {
      if (hide) mask &= ~0x10;
      mask ^= 0x20;
    }

    flags[absId] = currFlag & mask;
  });
};

// Return a function for generating a path across a field of intersecting arcs
// TODO: add option to calculate angle on sphere for lat-lng coords
//
MapShaper.getPathFinder = function(nodes, useRoute, routeIsVisible, chooseRoute, spherical) {
  var arcs = nodes.arcs,
      coords = arcs.getVertexData(),
      xx = coords.xx,
      yy = coords.yy,
      calcAngle = spherical ? geom.signedAngleSph : geom.signedAngle;

  function getNextArc(prevId) {
    var ai = arcs.indexOfVertex(prevId, -2),
        ax = xx[ai],
        ay = yy[ai],
        bi = arcs.indexOfVertex(prevId, -1),
        bx = xx[bi],
        by = yy[bi],
        nextId = NaN,
        nextAngle = 0;

    nodes.forEachConnectedArc(prevId, function(candId) {
      if (!routeIsVisible(~candId)) return;
      if (arcs.getArcLength(candId) < 2) error("[pathfinder] defective arc");

      var ci = arcs.indexOfVertex(candId, -2),
          cx = xx[ci],
          cy = yy[ci],

          // sanity check: make sure both arcs share the same vertex;
          di = arcs.indexOfVertex(candId, -1),
          dx = xx[di],
          dy = yy[di],
          candAngle;
      if (dx !== bx || dy !== by) {
        message("cd:", cx, cy, dx, dy, 'arc:', candId);
        error("Error in node topology");
      }

      candAngle = calcAngle(ax, ay, bx, by, cx, cy);

      if (candAngle > 0) {
        if (nextAngle === 0) {
          nextId = candId;
          nextAngle = candAngle;
        } else {
          var choice = chooseRoute(~nextId, nextAngle, ~candId, candAngle, prevId);
          if (choice == 2) {
            nextId = candId;
            nextAngle = candAngle;
          }
        }
      } else {
        // candAngle is NaN or 0
        trace("#getNextArc() Invalid angle; id:", candId, "angle:", candAngle);
        nodes.debugNode(prevId);
      }
    });

    if (nextId === prevId) {
      // TODO: confirm that this can't happen
      nodes.debugNode(prevId);
      error("#getNextArc() nextId === prevId");
    }
    return ~nextId; // reverse arc to point onwards
  }

  return function(startId) {
    var path = [],
        nextId, msg,
        candId = startId,
        verbose = false;

    do {
      if (verbose) msg = (nextId === undefined ? " " : "  " + nextId) + " -> " + candId;
      if (useRoute(candId)) {
        path.push(candId);
        nextId = candId;
        if (verbose) message(msg);
        candId = getNextArc(nextId);
        if (verbose && candId == startId ) message("  o", geom.getPlanarPathArea(path, arcs));
      } else {
        if (verbose) message(msg + " x");
        return null;
      }

      if (candId == ~nextId) {
        trace("dead-end"); // TODO: handle or prevent this error condition
        return null;
      }
    } while (candId != startId);
    return path.length === 0 ? null : path;
  };
};

// types: "dissolve" "flatten"
// Returns a function for flattening or dissolving a collection of rings
// Assumes rings are oriented in CW direction
//
MapShaper.getRingIntersector = function(nodes, type, flags, spherical) {
  var arcs = nodes.arcs;
  var findPath = MapShaper.getPathFinder(nodes, useRoute, routeIsActive, chooseRoute, spherical);
  flags = flags || new Uint8Array(arcs.size());

  return function(rings) {
    var dissolve = type == 'dissolve',
        openFwd = true,
        openRev = type == 'flatten',
        output;
    // even single rings get transformed (e.g. to remove spikes)
    if (rings.length > 0) {
      output = [];
      MapShaper.openArcRoutes(rings, arcs, flags, openFwd, openRev, dissolve);
      MapShaper.forEachPath(rings, function(ids) {
        var path;
        for (var i=0, n=ids.length; i<n; i++) {
          path = findPath(ids[i]);
          if (path) {
            output.push(path);
          }
        }
      });
      MapShaper.closeArcRoutes(rings, arcs, flags, openFwd, openRev, true);
    } else {
      output = rings;
    }
    return output;
  };

  function chooseRoute(id1, angle1, id2, angle2, prevId) {
    var route = 1;
    if (angle1 == angle2) {
      trace("[chooseRoute()] parallel routes, unsure which to choose");
      //MapShaper.debugRoute(id1, id2, nodes.arcs);
    } else if (angle2 < angle1) {
      route = 2;
    }
    return route;
  }

  function routeIsActive(arcId) {
    var bits = MapShaper.getRouteBits(arcId, flags);
    return (bits & 1) == 1;
  }

  function useRoute(arcId) {
    var route = MapShaper.getRouteBits(arcId, flags),
        isOpen = false;

    if (route == 3) {
      isOpen = true;
      MapShaper.setRouteBits(1, arcId, flags); // close the path, leave visible
    }

    return isOpen;
  }
};

MapShaper.debugFlags = function(flags) {
  var arr = [];
  utils.forEach(flags, function(flag) {
    arr.push(bitsToString(flag));
  });
  message(arr);

  function bitsToString(bits) {
    var str = "";
    for (var i=0; i<8; i++) {
      str += (bits & (1 << i)) > 0 ? "1" : "0";
      if (i < 7) str += ' ';
      if (i == 3) str += ' ';
    }
    return str;
  }
};

/*
// Print info about two arcs whose first segments are parallel
//
MapShaper.debugRoute = function(id1, id2, arcs) {
  var n1 = arcs.getArcLength(id1),
      n2 = arcs.getArcLength(id2),
      len1 = 0,
      len2 = 0,
      p1, p2, pp1, pp2, ppp1, ppp2,
      angle1, angle2;

      console.log("chooseRoute() lengths:", n1, n2, 'ids:', id1, id2);
  for (var i=0; i<n1 && i<n2; i++) {
    p1 = arcs.getVertex(id1, i);
    p2 = arcs.getVertex(id2, i);
    if (i === 0) {
      if (p1.x != p2.x || p1.y != p2.y) {
        error("chooseRoute() Routes should originate at the same point)");
      }
    }

    if (i > 1) {
      angle1 = signedAngle(ppp1.x, ppp1.y, pp1.x, pp1.y, p1.x, p1.y);
      angle2 = signedAngle(ppp2.x, ppp2.y, pp2.x, pp2.y, p2.x, p2.y);

      console.log("angles:", angle1, angle2, 'lens:', len1, len2);
      // return;
    }

    if (i >= 1) {
      len1 += distance2D(p1.x, p1.y, pp1.x, pp1.y);
      len2 += distance2D(p2.x, p2.y, pp2.x, pp2.y);
    }

    if (i == 1 && (n1 == 2 || n2 == 2)) {
      console.log("arc1:", pp1, p1, "len:", len1);
      console.log("arc2:", pp2, p2, "len:", len2);
    }

    ppp1 = pp1;
    ppp2 = pp2;
    pp1 = p1;
    pp2 = p2;
  }
  return 1;
};
*/




// Returns a function that separates rings in a polygon into space-enclosing rings
// and holes. Also fixes self-intersections.
//
MapShaper.getHoleDivider = function(nodes, spherical) {
  var split = MapShaper.getSelfIntersectionSplitter(nodes);

  return function(rings, cw, ccw) {
    var pathArea = spherical ? geom.getSphericalPathArea : geom.getPlanarPathArea;
    MapShaper.forEachPath(rings, function(ringIds) {
      var splitRings = split(ringIds);
      if (splitRings.length === 0) {
        trace("[getRingDivider()] Defective path:", ringIds);
      }
      splitRings.forEach(function(ringIds, i) {
        var ringArea = pathArea(ringIds, nodes.arcs);
        if (ringArea > 0) {
          cw.push(ringIds);
        } else if (ringArea < 0) {
          ccw.push(ringIds);
        }
      });
    });
  };
};




// clean polygon or polyline shapes, in-place
//
MapShaper.cleanShapes = function(shapes, arcs, type) {
  for (var i=0, n=shapes.length; i<n; i++) {
    shapes[i] = MapShaper.cleanShape(shapes[i], arcs, type);
  }
};

// Remove defective arcs and zero-area polygon rings
// Remove simple polygon spikes of form: [..., id, ~id, ...]
// Don't remove duplicate points
// Don't check winding order of polygon rings
MapShaper.cleanShape = function(shape, arcs, type) {
  return MapShaper.editPaths(shape, function(path) {
    var cleaned = MapShaper.cleanPath(path, arcs);
    if (type == 'polygon' && cleaned) {
      MapShaper.removeSpikesInPath(cleaned); // assumed by divideArcs()
      if (geom.getPlanarPathArea(cleaned, arcs) === 0) {
        cleaned = null;
      }
    }
    return cleaned;
  });
};

MapShaper.cleanPath = function(path, arcs) {
  var nulls = 0;
  for (var i=0, n=path.length; i<n; i++) {
    if (arcs.arcIsDegenerate(path[i])) {
      nulls++;
      path[i] = null;
    }
  }
  return nulls > 0 ? path.filter(function(id) {return id !== null;}) : path;
};

// Remove pairs of ids where id[n] == ~id[n+1] or id[0] == ~id[n-1];
// (in place)
MapShaper.removeSpikesInPath = function(ids) {
  var n = ids.length;
  if (n >= 2) {
    if (ids[0] == ~ids[n-1]) {
      ids.pop();
      ids.shift();
    } else {
      for (var i=1; i<n; i++) {
        if (ids[i-1] == ~ids[i]) {
          ids.splice(i-1, 2);
          break;
        }
      }
    }
    if (ids.length < n) {
      MapShaper.removeSpikesInPath(ids);
    }
  }
};


// TODO: Need to rethink polygon repair: these function can cause problems
// when part of a self-intersecting polygon is removed
//
MapShaper.repairPolygonGeometry = function(layers, dataset, opts) {
  var nodes = MapShaper.divideArcs(dataset);
  layers.forEach(function(lyr) {
    MapShaper.repairSelfIntersections(lyr, nodes);
  });
  return layers;
};

// Remove any small shapes formed by twists in each ring
// // OOPS, NO // Retain only the part with largest area
// // this causes problems when a cut-off hole has a matching ring in another polygon
// TODO: consider cases where cut-off parts should be retained
//
MapShaper.repairSelfIntersections = function(lyr, nodes) {
  var splitter = MapShaper.getSelfIntersectionSplitter(nodes);

  lyr.shapes = lyr.shapes.map(function(shp, i) {
    return cleanPolygon(shp);
  });

  function cleanPolygon(shp) {
    var cleanedPolygon = [];
    MapShaper.forEachPath(shp, function(ids) {
      // TODO: consider returning null if path can't be split
      var splitIds = splitter(ids);
      if (splitIds.length === 0) {
        error("[cleanPolygon()] Defective path:", ids);
      } else if (splitIds.length == 1) {
        cleanedPolygon.push(splitIds[0]);
      } else {
        var shapeArea = geom.getPlanarPathArea(ids, nodes.arcs),
            sign = shapeArea > 0 ? 1 : -1,
            mainRing;

        var maxArea = splitIds.reduce(function(max, ringIds, i) {
          var pathArea = geom.getPlanarPathArea(ringIds, nodes.arcs) * sign;
          if (pathArea > max) {
            mainRing = ringIds;
            max = pathArea;
          }
          return max;
        }, 0);

        if (mainRing) {
          cleanedPolygon.push(mainRing);
        }
      }
    });
    return cleanedPolygon.length > 0 ? cleanedPolygon : null;
  }
};




// Functions for dividing polygons and polygons at points where arc-segments intersect

// Divide a collection of arcs at points where segments intersect
// and re-index the paths of all the layers that reference the arc collection.
// (in-place)
MapShaper.divideArcs = function(dataset) {
  var arcs = dataset.arcs;
  T.start();
  T.start();
  var snapDist = MapShaper.getHighPrecisionSnapInterval(arcs);
  var snapCount = MapShaper.snapCoordsByInterval(arcs, snapDist);
  var dupeCount = arcs.dedupCoords();
  T.stop('snap points');
  if (snapCount > 0 || dupeCount > 0) {
    T.start();
    // Detect topology again if coordinates have changed
    api.buildTopology(dataset);
    T.stop('rebuild topology');
  }

  // clip arcs at points where segments intersect
  T.start();
  var map = MapShaper.insertClippingPoints(arcs);
  T.stop('insert clipping points');
  T.start();
  // update arc ids in arc-based layers and clean up arc geometry
  // to remove degenerate arcs and duplicate points
  var nodes = new NodeCollection(arcs);
  dataset.layers.forEach(function(lyr) {
    if (MapShaper.layerHasPaths(lyr)) {
      MapShaper.updateArcIds(lyr.shapes, map, nodes);
      // TODO: consider alternative -- avoid creating degenerate arcs
      // in insertClippingPoints()
      MapShaper.cleanShapes(lyr.shapes, arcs, lyr.geometry_type);
    }
  });
  T.stop('update arc ids / clean geometry');
  T.stop("divide arcs");
  return nodes;
};

MapShaper.updateArcIds = function(shapes, map, nodes) {
  var arcCount = nodes.arcs.size(),
      shape2;
  for (var i=0; i<shapes.length; i++) {
    shape2 = [];
    MapShaper.forEachPath(shapes[i], remapPathIds);
    shapes[i] = shape2;
  }

  function remapPathIds(ids) {
    if (!ids) return; // null shape
    var ids2 = [];
    for (var j=0; j<ids.length; j++) {
      remapArcId(ids[j], ids2);
    }
    shape2.push(ids2);
  }

  function remapArcId(id, ids) {
    var rev = id < 0,
        absId = rev ? ~id : id,
        min = map[absId],
        max = (absId >= map.length - 1 ? arcCount : map[absId + 1]) - 1,
        id2;
    do {
      if (rev) {
        id2 = ~max;
        max--;
      } else {
        id2 = min;
        min++;
      }
      // If there are duplicate arcs, always use the same one
      if (nodes) {
        id2 = nodes.findMatchingArc(id2);
      }
      ids.push(id2);
    } while (max - min >= 0);
  }
};

// divide a collection of arcs at points where line segments cross each other
// @arcs ArcCollection
// returns array that maps original arc ids to new arc ids
MapShaper.insertClippingPoints = function(arcs) {
  var points = MapShaper.findClippingPoints(arcs),
      p;
  // TODO: avoid some or all of the following if no points need to be added

  // original arc data
  var pointTotal0 = arcs.getPointCount(),
      arcTotal0 = arcs.size(),
      data = arcs.getVertexData(),
      xx0 = data.xx,
      yy0 = data.yy,
      nn0 = data.nn,
      i0 = 0,
      n0, arcLen0;

  // new arc data
  var pointTotal1 = pointTotal0 + points.length * 2,
      xx1 = new Float64Array(pointTotal1),
      yy1 = new Float64Array(pointTotal1),
      nn1 = [],  // number of arcs may vary
      i1 = 0,
      n1;

  var map = new Uint32Array(arcTotal0);

  // sort from last point to first point
  points.sort(function(a, b) {
    return b.i - a.i || b.pct - a.pct;
  });
  p = points.pop();

  for (var id0=0, id1=0; id0 < arcTotal0; id0++) {
    arcLen0 = nn0[id0];
    map[id0] = id1;
    n0 = 0;
    n1 = 0;
    while (n0 < arcLen0) {
      n1++;
      xx1[i1] = xx0[i0];
      yy1[i1++] = yy0[i0];
      while (p && p.i === i0) {
        xx1[i1] = p.x;
        yy1[i1++] = p.y;
        n1++;
        nn1[id1++] = n1; // end current arc at intersection
        n1 = 0;          // begin new arc

        xx1[i1] = p.x;
        yy1[i1++] = p.y;
        n1++;
        p = points.pop();
      }
      n0++;
      i0++;
    }
    nn1[id1++] = n1;
  }

  if (i1 != pointTotal1) error("[insertClippingPoints()] Counting error");
  arcs.updateVertexData(nn1, xx1, yy1, null);

  // segment-point intersections create duplicate points
  // TODO: consider removing call to dedupCoords() -- empty arcs are removed by cleanShapes()
  arcs.dedupCoords();
  return map;
};

MapShaper.findClippingPoints = function(arcs) {
  var intersections = MapShaper.findSegmentIntersections(arcs),
      data = arcs.getVertexData(),
      xx = data.xx,
      yy = data.yy,
      points = [];

  intersections.forEach(function(o) {
    var p1 = getSegmentIntersection(o.x, o.y, o.a),
        p2 = getSegmentIntersection(o.x, o.y, o.b);
    if (p1) points.push(p1);
    if (p2) points.push(p2);
  });

  // remove 1. points that are at arc endpoints and 2. duplicate points
  // (kludgy -- look into preventing these cases, which are caused by T intersections)
  var index = {};
  return points.filter(function(p) {
    var key = p.i + "," + p.pct;
    if (key in index) return false;
    index[key] = true;
    if (p.pct <= 0 && arcs.pointIsEndpoint(p.i) ||
        p.pct >= 1 && arcs.pointIsEndpoint(p.j)) {
      return false;
    }
    return true;
  });

  function getSegmentIntersection(x, y, ids) {
    var i = ids[0],
        j = ids[1],
        dx = xx[j] - xx[i],
        dy = yy[j] - yy[i],
        pct;
    if (i > j) error("[findClippingPoints()] Out-of-sequence arc ids");
    if (dx === 0 && dy === 0) {
      pct = 0;
    } else if (Math.abs(dy) > Math.abs(dx)) {
      pct = (y - yy[i]) / dy;
    } else {
      pct = (x - xx[i]) / dx;
    }

    if (pct < 0 || pct > 1) {
      verbose("[findClippingPoints()] Off-segment intersection (caused by rounding error");
      trace("pct:", pct, "dx:", dx, "dy:", dy, 'x:', x, 'y:', y, 'xx[i]:', xx[i], 'xx[j]:', xx[j], 'yy[i]:', yy[i], 'yy[j]:', yy[j]);
      trace("xpct:", (x - xx[i]) / dx, 'ypct:', (y - yy[i]) / dy);
      if (pct < 0) pct = 0;
      if (pct > 1) pct = 1;
    }

    return {
        pct: pct,
        i: i,
        j: j,
        x: x,
        y: y
      };
  }
};




// List of encodings supported by iconv-lite:
// https://github.com/ashtuchkin/iconv-lite/wiki/Supported-Encodings

// Return list of supported encodings
MapShaper.getEncodings = function() {
  var iconv = require('iconv-lite');
  iconv.encodingExists('ascii'); // make iconv load its encodings
  return Object.keys(iconv.encodings);
};

MapShaper.validateEncoding = function(enc) {
  if (!MapShaper.encodingIsSupported(enc)) {
    stop("Unknown encoding:", enc, "\nRun the -encodings command see a list of supported encodings");
  }
  return enc;
};

MapShaper.encodingIsSupported = function(raw) {
  var enc = MapShaper.standardizeEncodingName(raw);
  return utils.contains(MapShaper.getEncodings(), enc);
};

// @buf a Node Buffer
MapShaper.decodeString = function(buf, encoding) {
  var iconv = require('iconv-lite'),
      str = iconv.decode(buf, encoding);
  // remove BOM if present
  if (str.charCodeAt(0) == 0xfeff) {
    str = str.substr(1);
  }
  return str;
};

// Ex. convert UTF-8 to utf8
MapShaper.standardizeEncodingName = function(enc) {
  return enc.toLowerCase().replace(/[_-]/g, '');
};

MapShaper.printEncodings = function() {
  var encodings = MapShaper.getEncodings().filter(function(name) {
    // filter out some aliases and non-applicable encodings
    return !/^(_|cs|internal|ibm|isoir|singlebyte|table|[0-9]|l[0-9]|windows)/.test(name);
  });
  encodings.sort();
  message("Supported encodings:");
  message(MapShaper.formatStringsAsGrid(encodings));
};




// Try to detect the encoding of some sample text.
// Returns an encoding name or null.
// @samples Array of buffers containing sample text fields
// TODO: Improve reliability and number of detectable encodings.
MapShaper.detectEncoding = function(samples) {
  var encoding = null;
  if (MapShaper.looksLikeUtf8(samples)) {
    encoding = 'utf8';
  } else if (MapShaper.looksLikeWin1252(samples)) {
    // Win1252 is the same as Latin1, except it replaces a block of control
    // characters with n-dash, Euro and other glyphs. Encountered in-the-wild
    // in Natural Earth (airports.dbf uses n-dash).
    encoding = 'win1252';
  }
  return encoding;
};

// Convert an array of text samples to a single string using a given encoding
MapShaper.decodeSamples = function(enc, samples) {
  return samples.map(function(buf) {
    return MapShaper.decodeString(buf, enc).trim();
  }).join('\n');
};

MapShaper.formatSamples = function(str) {
  return MapShaper.formatStringsAsGrid(str.split('\n'));
};

// Quick-and-dirty win1251 detection: decoded string contains mostly common ascii
// chars and almost no chars other than word chars + punctuation.
// This excludes encodings like Greek, Cyrillic or Thai, but
// is susceptible to false positives with encodings like codepage 1250 ("Eastern
// European").
MapShaper.looksLikeWin1252 = function(samples) {
  var ascii = 'abcdefghijklmnopqrstuvwxyz0123456789.\'"?+-\n,:;/|_$% ', //common l.c. ascii chars
      extended = 'ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ°–', // common extended
      str = MapShaper.decodeSamples('win1252', samples),
      asciiScore = MapShaper.getCharScore(str, ascii),
      totalScore = MapShaper.getCharScore(str, extended + ascii);
  return totalScore > 0.97 && asciiScore > 0.7;
};

// Accept string if it doesn't contain the "replacement character"
MapShaper.looksLikeUtf8 = function(samples) {
  var str = MapShaper.decodeSamples('utf8', samples);
  return str.indexOf('\ufffd') == -1;
};

// Calc percentage of chars in a string that are present in a second string
// @chars String of chars to look for in @str
MapShaper.getCharScore = function(str, chars) {
  var index = {},
      count = 0,
      score;
  str = str.toLowerCase();
  for (var i=0, n=chars.length; i<n; i++) {
    index[chars[i]] = 1;
  }
  for (i=0, n=str.length; i<n; i++) {
    count += index[str[i]] || 0;
  }
  return count / str.length;
};





MapShaper.deleteFields = function(table, test) {
  table.getFields().forEach(function(name) {
    if (test(name)) {
      table.deleteField(name);
    }
  });
};

MapShaper.isInvalidFieldName = function(f) {
  // Reject empty and all-whitespace strings. TODO: consider other criteria
  return /^\s*$/.test(f);
};

// Resolve name conflicts in field names by appending numbers
// @fields Array of field names
// @maxLen (optional) Maximum chars in name
//
MapShaper.getUniqFieldNames = function(fields, maxLen) {
  var used = {};
  return fields.map(function(name) {
    var i = 0,
        validName;
    do {
      validName = MapShaper.adjustFieldName(name, maxLen, i);
      i++;
    } while (validName in used);
    used[validName] = true;
    return validName;
  });
};

// Truncate and/or uniqify a name (if relevant params are present)
MapShaper.adjustFieldName = function(name, maxLen, i) {
  var name2, suff;
  maxLen = maxLen || 256;
  if (!i) {
    name2 = name.substr(0, maxLen);
  } else {
    suff = String(i);
    if (suff.length == 1) {
      suff = '_' + suff;
    }
    name2 = name.substr(0, maxLen - suff.length) + suff;
  }
  return name2;
};




// DBF format references:
// http://www.dbf2002.com/dbf-file-format.html
// http://www.digitalpreservation.gov/formats/fdd/fdd000325.shtml
// http://www.clicketyclick.dk/databases/xbase/format/index.html
// http://www.clicketyclick.dk/databases/xbase/format/data_types.html

var Dbf = {};

// source: http://webhelp.esri.com/arcpad/8.0/referenceguide/index.htm#locales/task_code.htm
Dbf.languageIds = [0x01,'437',0x02,'850',0x03,'1252',0x08,'865',0x09,'437',0x0A,'850',0x0B,'437',0x0D,'437',0x0E,'850',0x0F,'437',0x10,'850',0x11,'437',0x12,'850',0x13,'932',0x14,'850',0x15,'437',0x16,'850',0x17,'865',0x18,'437',0x19,'437',0x1A,'850',0x1B,'437',0x1C,'863',0x1D,'850',0x1F,'852',0x22,'852',0x23,'852',0x24,'860',0x25,'850',0x26,'866',0x37,'850',0x40,'852',0x4D,'936',0x4E,'949',0x4F,'950',0x50,'874',0x57,'1252',0x58,'1252',0x59,'1252',0x64,'852',0x65,'866',0x66,'865',0x67,'861',0x6A,'737',0x6B,'857',0x6C,'863',0x78,'950',0x79,'949',0x7A,'936',0x7B,'932',0x7C,'874',0x86,'737',0x87,'852',0x88,'857',0xC8,'1250',0xC9,'1251',0xCA,'1254',0xCB,'1253',0xCC,'1257'];

// Language & Language family names for some code pages
Dbf.encodingNames = {
  '932': "Japanese",
  '936': "Simplified Chinese",
  '950': "Traditional Chinese",
  '1252': "Western European",
  '949': "Korean",
  '874': "Thai",
  '1250': "Eastern European",
  '1251': "Russian",
  '1254': "Turkish",
  '1253': "Greek",
  '1257': "Baltic"
};

Dbf.ENCODING_PROMPT =
  "To avoid corrupted text, re-import using the \"encoding=\" option.\n" +
  "To see a list of supported encodings, run the \"encodings\" command.";

Dbf.lookupCodePage = function(lid) {
  var i = Dbf.languageIds.indexOf(lid);
  return i == -1 ? null : Dbf.languageIds[i+1];
};

Dbf.readAsciiString = function(bin, size) {
  var require7bit = Env.inNode;
  var str = bin.readCString(size, require7bit);
  if (str === null) {
    stop("DBF file contains non-ascii text.\n" + Dbf.ENCODING_PROMPT);
  }
  return utils.trim(str);
};

Dbf.readStringBytes = function(bin, size, buf) {
  var count = 0, c;
  for (var i=0; i<size; i++) {
    c = bin.readUint8();
    if (c === 0) break; // C string-terminator (observed in-the-wild)
    if (count > 0 || c != 32) { // ignore leading spaces (e.g. DBF numbers)
      buf[count++] = c;
    }
  }
  // ignore trailing spaces (DBF string fields are typically r-padded w/ spaces)
  while (count > 0 && buf[count-1] == 32) {
    count--;
  }
  return count;
};

Dbf.getAsciiStringReader = function() {
  var buf = new Uint8Array(256); // new Buffer(256);
  return function readAsciiString(bin, size) {
    var str = '',
        n = Dbf.readStringBytes(bin, size, buf);
    for (var i=0; i<n; i++) {
      str += String.fromCharCode(buf[i]);
    }
    return str;
  };
};

Dbf.getEncodedStringReader = function(encoding) {
  var buf = new Buffer(256),
      isUtf8 = MapShaper.standardizeEncodingName(encoding) == 'utf8';
  return function readEncodedString(bin, size) {
    var i = Dbf.readStringBytes(bin, size, buf),
        str;
    if (i === 0) {
      str = '';
    } else if (isUtf8) {
      str = buf.toString('utf8', 0, i);
    } else {
      str = MapShaper.decodeString(buf.slice(0, i), encoding); // slice references same memory
    }
    return str;
  };
};

Dbf.getStringReader = function(encoding) {
  if (!encoding || encoding === 'ascii') {
    return Dbf.getAsciiStringReader();
    // return Dbf.readAsciiString;
  } else if (Env.inNode) {
    return Dbf.getEncodedStringReader(encoding);
  } else {
    // TODO: user browserify or other means of decoding string data in the browser
    error("[Dbf.getStringReader()] Non-ascii encodings only supported in Node.");
  }
};

Dbf.bufferContainsHighBit = function(buf, n) {
  for (var i=0; i<n; i++) {
    if (buf[i] >= 128) return true;
  }
  return false;
};

Dbf.getNumberReader = function() {
  var read = Dbf.getAsciiStringReader();
  return function readNumber(bin, size) {
    var str = read(bin, size);
    var val;
    if (str.indexOf(',') >= 0) {
      str = str.replace(',', '.'); // handle comma decimal separator
    }
    val = parseFloat(str);
    return isNaN(val) ? null : val;
  };
};

Dbf.readInt = function(bin, size) {
  return bin.readInt32();
};

Dbf.readBool = function(bin, size) {
  var c = bin.readCString(size),
      val = null;
  if (/[ty]/i.test(c)) val = true;
  else if (/[fn]/i.test(c)) val = false;
  return val;
};

Dbf.readDate = function(bin, size) {
  var str = bin.readCString(size),
      yr = str.substr(0, 4),
      mo = str.substr(4, 2),
      day = str.substr(6, 2);
  return new Date(Date.UTC(+yr, +mo - 1, +day));
};

// cf. http://code.google.com/p/stringencoding/
//
// @src is a Buffer or ArrayBuffer or filename
//
function DbfReader(src, encodingArg) {
  if (utils.isString(src)) {
    error("[DbfReader] Expected a buffer, not a string");
  }
  var bin = new BinArray(src);
  var header = readHeader(bin);
  var encoding = encodingArg || null;

  this.size = function() {return header.recordCount;};

  this.readRow = function(i) {
    // create record reader on-the-fly
    // (delays encoding detection until we need to read data)
    return getRecordReader(header.fields)(i);
  };

  this.getFields = getFieldNames;

  this.getBuffer = function() {return bin.buffer();};

  this.deleteField = function(f) {
    header.fields = header.fields.filter(function(field) {
      return field.name != f;
    });
  };

  this.readRows = function() {
    var reader = getRecordReader(header.fields);
    var data = [];
    for (var r=0, n=this.size(); r<n; r++) {
      data.push(reader(r));
    }
    return data;
  };

  function readHeader(bin) {
    bin.position(0).littleEndian();
    var header = {
      version: bin.readInt8(),
      updateYear: bin.readUint8(),
      updateMonth: bin.readUint8(),
      updateDay: bin.readUint8(),
      recordCount: bin.readUint32(),
      dataOffset: bin.readUint16(),
      recordSize: bin.readUint16(),
      incompleteTransaction: bin.skipBytes(2).readUint8(),
      encrypted: bin.readUint8(),
      mdx: bin.skipBytes(12).readUint8(),
      ldid: bin.readUint8()
    };
    var colOffs = 1; // first column starts on second byte of record
    var field;
    bin.skipBytes(2);
    header.fields = [];

    // Detect header terminator (LF is standard, CR has been seen in the wild)
    while (bin.peek() != 0x0D && bin.peek() != 0x0A && bin.position() < header.dataOffset - 1) {
      field = readFieldHeader(bin);
      field.columnOffset = colOffs;
      header.fields.push(field);
      colOffs += field.size;
    }
    if (colOffs != header.recordSize) {
      error("Record length mismatch; header:", header.recordSize, "detected:", colOffs);
    }
    if (bin.peek() != 0x0D) {
      message('[dbf] Found a non-standard header terminator (' + bin.peek() + '). DBF file may be corrupted.');
    }

    // Uniqify header names
    MapShaper.getUniqFieldNames(utils.pluck(header.fields, 'name')).forEach(function(name2, i) {
      header.fields[i].name = name2;
    });

    return header;
  }

  function readFieldHeader(bin) {
    return {
      name: bin.readCString(11),
      type: String.fromCharCode(bin.readUint8()),
      address: bin.readUint32(),
      size: bin.readUint8(),
      decimals: bin.readUint8(),
      id: bin.skipBytes(2).readUint8(),
      position: bin.skipBytes(2).readUint8(),
      indexFlag: bin.skipBytes(7).readUint8()
    };
  }

  function getFieldNames() {
    return utils.pluck(header.fields, 'name');
  }

  function getRowOffset(r) {
    return header.dataOffset + header.recordSize * r;
  }

  function getEncoding() {
    if (!encoding) {
      encoding = findStringEncoding();
      if (!encoding) {
        // fall back to utf8 if detection fails (so GUI can continue without further errors)
        encoding = 'utf8';
        stop("Unable to auto-detect the text encoding of the DBF file.\n" + Dbf.ENCODING_PROMPT);
      }
    }
    return encoding;
  }

  // Create new record objects using object literal syntax
  // (Much faster in v8 and other engines than assigning a series of properties
  //  to an object)
  function getRecordConstructor() {
    var args = getFieldNames().map(function(name, i) {
          return JSON.stringify(name) + ': arguments[' + i + ']';
        });
    return new Function('return {' + args.join(',') + '};');
  }

  function findEofPos(bin) {
    var pos = bin.size() - 1;
    if (bin.peek(pos) != 0x1A) { // last byte may or may not be EOF
      pos++;
    }
    return pos;
  }

  function getRecordReader(fields) {
    var readers = fields.map(getFieldReader),
        eofOffs = findEofPos(bin),
        create = getRecordConstructor(),
        values = [];

    return function readRow(r) {
      var offs = getRowOffset(r),
          fieldOffs, field;
      for (var c=0, cols=fields.length; c<cols; c++) {
        field = fields[c];
        fieldOffs = offs + field.columnOffset;
        if (fieldOffs + field.size > eofOffs) {
          stop('[dbf] Invalid DBF file: encountered end-of-file while reading data');
        }
        bin.position(fieldOffs);
        values[c] = readers[c](bin, field.size);
      }
      return create.apply(null, values);
    };
  }

  // @f Field metadata from dbf header
  function getFieldReader(f) {
    var type = f.type,
        r = null;
    if (type == 'I') {
      r = Dbf.readInt;
    } else if (type == 'F' || type == 'N') {
      r = Dbf.getNumberReader();
    } else if (type == 'L') {
      r = Dbf.readBool;
    } else if (type == 'D') {
      r = Dbf.readDate;
    } else if (type == 'C') {
      r = Dbf.getStringReader(getEncoding());
    } else {
      message("[dbf] Field \"" + field.name + "\" has an unsupported type (" + field.type + ") -- converting to null values");
      r = function() {return null;};
    }
    return r;
  }

  function findStringEncoding() {
    var ldid = header.ldid,
        codepage = Dbf.lookupCodePage(ldid),
        samples = getNonAsciiSamples(50),
        only7bit = samples.length === 0,
        encoding, msg;

    // First, check the ldid (language driver id) (an obsolete way to specify which
    // codepage to use for text encoding.)
    // ArcGIS up to v.10.1 sets ldid and encoding based on the 'locale' of the
    // user's Windows system :P
    //
    if (codepage && ldid != 87) {
      // if 8-bit data is found and codepage is detected, use the codepage,
      // except ldid 87, which some GIS software uses regardless of encoding.
      encoding = codepage;
    } else if (only7bit) {
      // Text with no 8-bit chars should be compatible with 7-bit ascii
      // (Most encodings are supersets of ascii)
      encoding = 'ascii';
    }

    // As a last resort, try to guess the encoding:
    if (!encoding) {
      encoding = MapShaper.detectEncoding(samples);
    }

    // Show a sample of decoded text if non-ascii-range text has been found
    if (encoding && samples.length > 0) {
      msg = "Detected DBF text encoding: " + encoding;
      if (encoding in Dbf.encodingNames) {
        msg += " (" + Dbf.encodingNames[encoding] + ")";
      }
      message(msg);
      msg = MapShaper.decodeSamples(encoding, samples);
      msg = MapShaper.formatStringsAsGrid(msg.split('\n'));
      message("Sample text containing non-ascii characters:" + (msg.length > 60 ? '\n' : '') + msg);
    }
    return encoding;
  }

  // Return up to @size buffers containing text samples
  // with at least one byte outside the 7-bit ascii range.
  function getNonAsciiSamples(size) {
    var samples = [];
    var stringFields = header.fields.filter(function(f) {
      return f.type == 'C';
    });
    var buf = new Buffer(256);
    var index = {};
    var f, chars, sample, hash;
    for (var r=0, rows=header.recordCount; r<rows; r++) {
      for (var c=0, cols=stringFields.length; c<cols; c++) {
        if (samples.length >= size) break;
        f = stringFields[c];
        bin.position(getRowOffset(r) + f.columnOffset);
        chars = Dbf.readStringBytes(bin, f.size, buf);
        if (chars > 0 && Dbf.bufferContainsHighBit(buf, chars)) {
          sample = new Buffer(buf.slice(0, chars)); //
          hash = sample.toString('hex');
          if (hash in index === false) { // avoid duplicate samples
            index[hash] = true;
            samples.push(sample);
          }
        }
      }
    }
    return samples;
  }

}




Dbf.MAX_STRING_LEN = 254;

Dbf.exportRecords = function(arr, encoding) {
  encoding = encoding || 'ascii';
  var fields = Dbf.getFieldNames(arr);
  var uniqFields = MapShaper.getUniqFieldNames(fields, 10);
  var rows = arr.length;
  var fieldData = fields.map(function(name) {
    return Dbf.getFieldInfo(arr, name, encoding);
  });

  var headerBytes = Dbf.getHeaderSize(fieldData.length),
      recordBytes = Dbf.getRecordSize(utils.pluck(fieldData, 'size')),
      fileBytes = headerBytes + rows * recordBytes + 1;

  var buffer = new ArrayBuffer(fileBytes);
  var bin = new BinArray(buffer).littleEndian();
  var now = new Date();

  // write header
  bin.writeUint8(3);
  bin.writeUint8(now.getFullYear() - 1900);
  bin.writeUint8(now.getMonth() + 1);
  bin.writeUint8(now.getDate());
  bin.writeUint32(rows);
  bin.writeUint16(headerBytes);
  bin.writeUint16(recordBytes);
  bin.skipBytes(17);
  bin.writeUint8(0); // language flag; TODO: improve this
  bin.skipBytes(2);

  // field subrecords
  fieldData.reduce(function(recordOffset, obj, i) {
    var fieldName = uniqFields[i];
    bin.writeCString(fieldName, 11);
    bin.writeUint8(obj.type.charCodeAt(0));
    bin.writeUint32(recordOffset);
    bin.writeUint8(obj.size);
    bin.writeUint8(obj.decimals);
    bin.skipBytes(14);
    return recordOffset + obj.size;
  }, 1);

  bin.writeUint8(0x0d); // "field descriptor terminator"
  if (bin.position() != headerBytes) {
    error("Dbf#exportRecords() header size mismatch; expected:", headerBytes, "written:", bin.position());
  }

  arr.forEach(function(rec, i) {
    var start = bin.position();
    bin.writeUint8(0x20); // delete flag; 0x20 valid 0x2a deleted
    for (var j=0, n=fieldData.length; j<n; j++) {
      fieldData[j].write(i, bin);
    }
    if (bin.position() - start != recordBytes) {
      error("#exportRecords() Error exporting record:", rec);
    }
  });

  bin.writeUint8(0x1a); // end-of-file

  if (bin.position() != fileBytes) {
    error("Dbf#exportRecords() file size mismatch; expected:", fileBytes, "written:", bin.position());
  }
  return buffer;
};


Dbf.getFieldNames = function(records) {
  if (!records || !records.length) {
    return [];
  }
  var names = Object.keys(records[0]);
  names.sort(); // kludge: sorting gives correct order when truncating fields
  return names;
};


Dbf.getHeaderSize = function(numFields) {
  return 33 + numFields * 32;
};

Dbf.getRecordSize = function(fieldSizes) {
  return utils.sum(fieldSizes) + 1; // delete byte plus data bytes
};

/*
Dbf.getValidFieldName = function(name) {
  // TODO: handle non-ascii chars in name
  return name.substr(0, 10); // max 10 chars
};
*/

Dbf.initNumericField = function(info, arr, name) {
  var MAX_FIELD_SIZE = 18,
      size;

  data = this.getNumericFieldInfo(arr, name);
  info.decimals = data.decimals;
  size = Math.max(data.max.toFixed(info.decimals).length,
      data.min.toFixed(info.decimals).length);
  if (size > MAX_FIELD_SIZE) {
    size = MAX_FIELD_SIZE;
    info.decimals -= size - MAX_FIELD_SIZE;
    if (info.decimals < 0) {
      error ("Dbf#getFieldInfo() Out-of-range error.");
    }
  }
  info.size = size;

  var formatter = Dbf.getDecimalFormatter(size, info.decimals);
  info.write = function(i, bin) {
    var rec = arr[i],
        str = formatter(rec[name]);
    if (str.length < size) {
      str = utils.lpad(str, size, ' ');
    }
    bin.writeString(str, size);
  };
};

Dbf.initBooleanField = function(info, arr, name) {
  info.size = 1;
  info.write = function(i, bin) {
    var val = arr[i][name],
        c;
    if (val === true) c = 'T';
    else if (val === false) c = 'F';
    else c = '?';
    bin.writeString(c);
  };
};

Dbf.initDateField = function(info, arr, name) {
  info.size = 8;
  info.write = function(i, bin) {
    var d = arr[i][name],
        str;
    if (d instanceof Date === false) {
      str = '00000000';
    } else {
      str = utils.lpad(d.getUTCFullYear(), 4, '0') +
            utils.lpad(d.getUTCMonth() + 1, 2, '0') +
            utils.lpad(d.getUTCDate(), 2, '0');
    }
    bin.writeString(str);
  };
};

Dbf.initStringField = function(info, arr, name, encoding) {
  var formatter = Dbf.getStringWriter(encoding);
  var size = 0;
  var values = arr.map(function(rec) {
    var buf = formatter(rec[name]);
    size = Math.max(size, buf.byteLength);
    return buf;
  });
  info.size = size;
  info.write = function(i, bin) {
    var buf = values[i],
        bytes = Math.min(size, buf.byteLength),
        idx = bin.position();
    bin.writeBuffer(buf, bytes, 0);
    bin.position(idx + size);
  };
};

Dbf.getFieldInfo = function(arr, name, encoding) {
  var type = this.discoverFieldType(arr, name),
      info = {
        name: name,
        type: type,
        decimals: 0
      };
  if (type == 'N') {
    Dbf.initNumericField(info, arr, name);
  } else if (type == 'C') {
    Dbf.initStringField(info, arr, name, encoding);
  } else if (type == 'L') {
    Dbf.initBooleanField(info, arr, name);
  } else if (type == 'D') {
    Dbf.initDateField(info, arr, name);
  } else {
    // Treat null fields as empty numeric fields; this way, they will be imported
    // again as nulls.
    info.size = 0;
    info.type = 'N';
    info.write = function() {};
  }
  return info;
};

Dbf.discoverFieldType = function(arr, name) {
  var val;
  for (var i=0, n=arr.length; i<n; i++) {
    val = arr[i][name];
    if (utils.isString(val)) return "C";
    if (utils.isNumber(val)) return "N";
    if (utils.isBoolean(val)) return "L";
    if (val instanceof Date) return "D";
  }
  return null;
};

Dbf.getDecimalFormatter = function(size, decimals) {
  // TODO: find better way to handle nulls
  var nullValue = ' '; // ArcGIS may use 0
  return function(val) {
    // TODO: handle invalid values better
    var valid = utils.isFiniteNumber(val),
        strval = valid ? val.toFixed(decimals) : String(nullValue);
    return utils.lpad(strval, size, ' ');
  };
};

Dbf.getNumericFieldInfo = function(arr, name) {
  var maxDecimals = 0,
      limit = 15,
      min = Infinity,
      max = -Infinity,
      k = 1,
      val, decimals;
  for (var i=0, n=arr.length; i<n; i++) {
    val = arr[i][name];
    if (!utils.isFiniteNumber(val)) {
      continue;
    }
    decimals = 0;
    if (val < min) min = val;
    if (val > max) max = val;
    while (val * k % 1 !== 0) {
      if (decimals == limit) {
        // TODO: verify limit, remove oflo message, round overflowing values
        // trace ("#getNumericFieldInfo() Number field overflow; value:", val);
        break;
      }
      decimals++;
      k *= 10;
    }
    if (decimals > maxDecimals) maxDecimals = decimals;
  }
  return {
    decimals: maxDecimals,
    min: min,
    max: max
  };
};

// Return function to convert a JS str to an ArrayBuffer containing encoded str.
Dbf.getStringWriter = function(encoding) {
  if (encoding === 'ascii') {
    return Dbf.getStringWriterAscii();
  } else {
    return Dbf.getStringWriterEncoded(encoding);
  }
};

// TODO: handle non-ascii chars. Option: switch to
// utf8 encoding if non-ascii chars are found.
Dbf.getStringWriterAscii = function() {
  return function(val) {
    var str = String(val),
        n = Math.min(str.length, Dbf.MAX_STRING_LEN),
        dest = new ArrayBuffer(n),
        view = new Uint8ClampedArray(dest);
    for (var i=0; i<n; i++) {
      view[i] = str.charCodeAt(i);
    }
    return dest;
  };
};

Dbf.getStringWriterEncoded = function(encoding) {
  var iconv = require('iconv-lite');
  return function(val) {
    var buf = iconv.encode(val, encoding);
    if (buf.length >= Dbf.MAX_STRING_LEN) {
      buf = Dbf.truncateEncodedString(buf, encoding, Dbf.MAX_STRING_LEN);
    }
    return BinArray.toArrayBuffer(buf);
  };
};

// try to remove partial multi-byte characters from the end of an encoded string.
Dbf.truncateEncodedString = function(buf, encoding, maxLen) {
  var truncated = buf.slice(0, maxLen);
  var len = maxLen;
  var tmp, str;
  while (len > 0 && len >= maxLen - 3) {
    tmp = len == maxLen ? truncated : buf.slice(0, len);
    str = MapShaper.decodeString(tmp, encoding);
    if (str.charAt(str.length-1) != '\ufffd') {
      truncated = tmp;
      break;
    }
    len--;
  }
  return truncated;
};




var dataFieldRxp = /^[a-zA-Z_][a-zA-Z_0-9]*$/;

function DataTable(obj) {
  var records;
  if (utils.isArray(obj)) {
    records = obj;
  } else {
    records = [];
    // integer object: create empty records
    if (utils.isInteger(obj)) {
      for (var i=0; i<obj; i++) {
        records.push({});
      }
    } else if (obj) {
      error("[DataTable] Invalid constructor argument:", obj);
    }
  }

  this.exportAsDbf = function(encoding) {
    return Dbf.exportRecords(records, encoding);
  };

  this.getRecords = function() {
    return records;
  };

  this.getRecordAt = function(i) {
    return records[i];
  };
}

var dataTableProto = {
  fieldExists: function(name) {
    return utils.contains(this.getFields(), name);
  },

  exportAsJSON: function() {
    return JSON.stringify(this.getRecords());
  },

  addField: function(name, init) {
    var useFunction = utils.isFunction(init);
    if (!utils.isNumber(init) && !utils.isString(init) && !useFunction) {
      error("DataTable#addField() requires a string, number or function for initialization");
    }
    if (this.fieldExists(name)) error("DataTable#addField() tried to add a field that already exists:", name);
    if (!dataFieldRxp.test(name)) error("DataTable#addField() invalid field name:", name);

    this.getRecords().forEach(function(obj, i) {
      obj[name] = useFunction ? init(obj, i) : init;
    });
  },

  addIdField: function() {
    this.addField('FID', function(obj, i) {
      return i;
    });
  },

  deleteField: function(f) {
    this.getRecords().forEach(function(o) {
      delete o[f];
    });
  },

  getFields: function() {
    var records = this.getRecords(),
        first = records[0];
    return first ? Object.keys(first) : [];
  },

  update: function(f) {
    var records = this.getRecords();
    for (var i=0, n=records.length; i<n; i++) {
      records[i] = f(records[i], i);
    }
  },

  clone: function() {
    // TODO: this could be sped up using a record constructor function
    // (see getRecordConstructor() in DbfReader)
    var records2 = this.getRecords().map(function(rec) {
      return utils.extend({}, rec);
    });
    return new DataTable(records2);
  },

  size: function() {
    return this.getRecords().length;
  }
};

utils.extend(DataTable.prototype, dataTableProto);




// Return a function to convert original feature ids into ids of combined features
// Use categorical classification (a different id for each unique value)
MapShaper.getCategoryClassifier = function(field, data) {
  if (!field) return function(i) {return 0;};
  if (!data || !data.fieldExists(field)) {
    stop("[dissolve] Data table is missing field:", field);
  }
  var index = {},
      count = 0,
      records = data.getRecords();
  return function(i) {
    var val = String(records[i][field]);
    if (val in index === false) {
      index[val] = count++;
    }
    return index[val];
  };
};

// Return a properties array for a set of aggregated features
//
// @properties input records
// @getGroupId()  converts input record id to id of aggregated record
//
MapShaper.aggregateDataRecords = function(properties, getGroupId, opts) {
  var arr = [];
  var sumFields = opts.sum_fields || [],
      copyFields = opts.copy_fields || [];

  if (opts.field) {
    copyFields.push(opts.field);
  }

  properties.forEach(function(rec, i) {
    if (!rec) return;
    var idx = getGroupId(i),
        dissolveRec;

    if (idx in arr) {
      dissolveRec = arr[idx];
    } else {
      arr[idx] = dissolveRec = {};
      copyFields.forEach(function(f) {
        dissolveRec[f] = rec[f];
      });
    }

    sumFields.forEach(function(f) {
      // TODO: handle strings
      dissolveRec[f] = (rec[f] || 0) + (dissolveRec[f] || 0);
    });
  });
  return arr;
};




MapShaper.simplifyArcsFast = function(arcs, dist) {
  var xx = [],
      yy = [],
      nn = [],
      count;
  for (var i=0, n=arcs.size(); i<n; i++) {
    count = MapShaper.simplifyPathFast([i], arcs, dist, xx, yy);
    if (count == 1) {
      count = 0;
      xx.pop();
      yy.pop();
    }
    nn.push(count);
  }
  return new ArcCollection(nn, xx, yy);
};

MapShaper.simplifyPolygonFast = function(shp, arcs, dist) {
  if (!shp || !dist) return null;
  var xx = [],
      yy = [],
      nn = [],
      shp2 = [];

  shp.forEach(function(path) {
    var count = MapShaper.simplifyPathFast(path, arcs, dist, xx, yy);
    while (count < 4 && count > 0) {
      xx.pop();
      yy.pop();
      count--;
    }
    if (count > 0) {
      shp2.push([nn.length]);
      nn.push(count);
    }
  });
  return {
    shape: shp2.length > 0 ? shp2 : null,
    arcs: new ArcCollection(nn, xx, yy)
  };
};

MapShaper.simplifyPathFast = function(path, arcs, dist, xx, yy) {
  var iter = arcs.getShapeIter(path),
      count = 0,
      prevX, prevY, x, y;
  while (iter.hasNext()) {
    x = iter.x;
    y = iter.y;
    if (count === 0 || distance2D(x, y, prevX, prevY) > dist) {
      xx.push(x);
      yy.push(y);
      prevX = x;
      prevY = y;
      count++;
    }
  }
  if (x != prevX || y != prevY) {
    xx.push(x);
    yy.push(y);
    count++;
  }
  return count;
};




// Get the centroid of the largest ring of a polygon
// TODO: Include holes in the calculation
// TODO: Add option to find centroid of all rings, not just the largest
geom.getShapeCentroid = function(shp, arcs) {
  var maxPath = geom.getMaxPath(shp, arcs);
  return maxPath ? geom.getPathCentroid(maxPath, arcs) : null;
};

geom.getPathCentroid = function(ids, arcs) {
  var iter = arcs.getShapeIter(ids),
      sum = 0,
      sumX = 0,
      sumY = 0,
      ax, ay, tmp, area;
  if (!iter.hasNext()) return null;
  ax = iter.x;
  ay = iter.y;
  while (iter.hasNext()) {
    tmp = ax * iter.y - ay * iter.x;
    sum += tmp;
    sumX += tmp * (iter.x + ax);
    sumY += tmp * (iter.y + ay);
    ax = iter.x;
    ay = iter.y;
  }
  area = sum / 2;
  if (area === 0) {
    return geom.getAvgPathXY(ids, arcs);
  } else return {
    x: sumX / (6 * area),
    y: sumY / (6 * area)
  };
};

// Find a point inside a polygon and located away from the polygon edge
// Method:
// - get the largest ring of the polygon
// - get an array of x-values distributed along the horizontal extent of the ring
// - for each x:
//     intersect a vertical line with the polygon at x
//     find midpoints of each intersecting segment
// - for each midpoint:
//     adjust point vertically to maximize weighted distance from polygon edge
// - return the adjusted point having the maximum weighted distance from the edge
//
// (distance is weighted to slightly favor points near centroid)
//
geom.findInteriorPoint = function(shp, arcs) {
  var maxPath = shp && geom.getMaxPath(shp, arcs),
      pathBounds = maxPath && arcs.getSimpleShapeBounds(maxPath),
      thresh, simple;
  if (!pathBounds || !pathBounds.hasBounds() || pathBounds.area() === 0) {
    return null;
  }
  thresh = Math.sqrt(pathBounds.area()) * 0.01;
  simple = MapShaper.simplifyPolygonFast(shp, arcs, thresh);
  if (!simple.shape) {
    return null; // collapsed shape
  }
  return geom.findInteriorPoint2(simple.shape, simple.arcs);
};

// Assumes: shp is a polygon with at least one space-enclosing ring
geom.findInteriorPoint2 = function(shp, arcs) {
  var maxPath = geom.getMaxPath(shp, arcs);
  var pathBounds = arcs.getSimpleShapeBounds(maxPath);
  var centroid = geom.getPathCentroid(maxPath, arcs);
  var weight = MapShaper.getPointWeightingFunction(centroid, pathBounds);
  var area = geom.getPlanarPathArea(maxPath, arcs);
  var hrange, lbound, rbound, focus, htics, hstep, p, p2;

  // Limit test area if shape is simple and squarish
  if (shp.length == 1 && area * 1.2 > pathBounds.area()) {
    htics = 5;
    focus = 0.2;
  } else if (shp.length == 1 && area * 1.7 > pathBounds.area()) {
    htics = 7;
    focus = 0.4;
  } else {
    htics = 11;
    focus = 0.5;
  }
  hrange = pathBounds.width() * focus;
  lbound = centroid.x - hrange / 2;
  rbound = lbound + hrange;
  hstep = hrange / htics;

  // Find a best-fit point
  p = MapShaper.probeForBestInteriorPoint(shp, arcs, lbound, rbound, htics, weight);
  if (!p) {
    verbose("[points inner] failed, falling back to centroid");
   p = centroid;
  } else {
    // Look for even better fit close to best-fit point
    p2 = MapShaper.probeForBestInteriorPoint(shp, arcs, p.x - hstep / 2,
        p.x + hstep / 2, 2, weight);
    if (p2.distance > p.distance) {
      p = p2;
    }
  }
  return p;
};

MapShaper.getPointWeightingFunction = function(centroid, pathBounds) {
  // Get a factor for weighting a candidate point
  // Points closer to the centroid are slightly preferred
  var referenceDist = Math.max(pathBounds.width(), pathBounds.height()) / 2;
  return function(x, y) {
    var offset = distance2D(centroid.x, centroid.y, x, y);
    return 1 - Math.min(0.6 * offset / referenceDist, 0.25);
  };
};

MapShaper.findInteriorPointCandidates = function(shp, arcs, xx) {
  var ymin = arcs.getBounds().ymin - 1;
  return xx.reduce(function(memo, x) {
    var cands = MapShaper.findHitCandidates(x, ymin, shp, arcs);
    return memo.concat(cands);
  }, []);
};

MapShaper.probeForBestInteriorPoint = function(shp, arcs, lbound, rbound, htics, weight) {
  var tics = MapShaper.getInnerTics(lbound, rbound, htics);
  var interval = (rbound - lbound) / htics;
  // Get candidate points, distributed along x-axis
  var candidates = MapShaper.findInteriorPointCandidates(shp, arcs, tics);
  var bestP, adjustedP, candP;

  // Sort candidates so points at the center of longer segments are tried first
  candidates.forEach(function(p) {
    p.interval *= weight(p.x, p.y);
  });
  candidates.sort(function(a, b) {
    return b.interval - a.interval;
  });

  for (var i=0; i<candidates.length; i++) {
    candP = candidates[i];
    // Optimization: Stop searching if weighted half-segment length of remaining
    //   points is less than the weighted edge distance of the best candidate
    if (bestP && bestP.distance > candP.interval) {
      break;
    }
    adjustedP = MapShaper.getAdjustedPoint(candP.x, candP.y, shp, arcs, interval, weight);

    if (!bestP || adjustedP.distance > bestP.distance) {
      bestP = adjustedP;
    }
  }
  return bestP;
};

// [x, y] is a point assumed to be inside a polygon @shp
// Try to move the point farther from the polygon edge
MapShaper.getAdjustedPoint = function(x, y, shp, arcs, vstep, weight) {
  var p = {
    x: x,
    y: y,
    distance: geom.getPointToShapeDistance(x, y, shp, arcs) * weight(x, y)
  };
  MapShaper.scanForBetterPoint(p, shp, arcs, vstep, weight); // scan up
  MapShaper.scanForBetterPoint(p, shp, arcs, -vstep, weight); // scan down
  return p;
};

// Try to find a better-fit point than @p by scanning vertically
// Modify p in-place
MapShaper.scanForBetterPoint = function(p, shp, arcs, vstep, weight) {
  var x = p.x,
      y = p.y,
      dmax = p.distance,
      d;

  while (true) {
    y += vstep;
    d = geom.getPointToShapeDistance(x, y, shp, arcs) * weight(x, y);
    // overcome vary small local minima
    if (d > dmax * 0.90 && geom.testPointInPolygon(x, y, shp, arcs)) {
      if (d > dmax) {
        p.distance = dmax = d;
        p.y = y;
      }
    } else {
      break;
    }
  }
};

// Return array of points at the midpoint of each line segment formed by the
//   intersection of a vertical ray at [x, y] and a polygon shape
MapShaper.findHitCandidates = function(x, y, shp, arcs) {
  var yy = MapShaper.findRayShapeIntersections(x, y, shp, arcs);
  var cands = [], y1, y2, interval;

  // sorting by y-coord organizes y-intercepts into interior segments
  utils.genericSort(yy);
  for (var i=0; i<yy.length; i+=2) {
    y1 = yy[i];
    y2 = yy[i+1];
    interval = (y2 - y1) / 2;
    if (interval > 0) {
      cands.push({
        y: (y1 + y2) / 2,
        x: x,
        interval: interval
      });
    }
  }
  return cands;
};

// Return array of y-intersections between vertical ray with origin at [x, y]
//   and a polygon
MapShaper.findRayShapeIntersections = function(x, y, shp, arcs) {
  if (!shp) return [];
  return shp.reduce(function(memo, path) {
    var yy = MapShaper.findRayRingIntersections(x, y, path, arcs);
    return memo.concat(yy);
  }, []);
};

// Return array of y-intersections between vertical ray and a polygon ring
MapShaper.findRayRingIntersections = function(x, y, path, arcs) {
  var yints = [];
  MapShaper.forEachPathSegment(path, arcs, function(a, b, xx, yy) {
    var result = geom.getRayIntersection(x, y, xx[a], yy[a], xx[b], yy[b]);
    if (result > -Infinity) {
      yints.push(result);
    }
  });
  // Ignore odd number of intersections -- probably caused by a ray that touches
  //   but doesn't cross the ring
  // TODO: improve method to handle edge case with two touches and no crosses.
  if (yints.length % 2 === 1) {
    yints = [];
  }
  return yints;
};

// TODO: find better home + name for this
MapShaper.getInnerTics = function(min, max, steps) {
  var range = max - min,
      step = range / (steps + 1),
      arr = [];
  for (var i = 1; i<=steps; i++) {
    arr.push(min + step * i);
  }
  return arr;
};




// Compiled expression returns a value
MapShaper.compileValueExpression = function(exp, lyr, arcs) {
  return MapShaper.compileFeatureExpression(exp, lyr, arcs, true);
};

MapShaper.compileFeatureExpression = function(rawExp, lyr, arcs, returns) {
  var exp = rawExp || '',
      vars = MapShaper.getAssignedVars(exp),
      func, records;

  if (vars.length > 0 && !lyr.data) {
    MapShaper.initDataTable(lyr);
  }

  records = lyr.data ? lyr.data.getRecords() : [];
  func = MapShaper.getExpressionFunction(exp, lyr, arcs, returns);
  return function(recId) {
    var record = records[recId];
    if (!record) {
      record = records[recId] = {};
    }
    // initialize new fields to null so assignments work
    for (var i=0; i<vars.length; i++) {
      if (vars[i] in record === false) {
        record[vars[i]] = null;
      }
    }
    return func(record, recId);
  };
};

MapShaper.getAssignedVars = function(exp) {
  var rxp = /[A-Za-z_][A-Za-z0-9_]*(?= *=[^=])/g;
  return exp.match(rxp) || [];
};

MapShaper.getExpressionFunction = function(exp, lyr, arcs, returns) {
  var env = MapShaper.getExpressionContext(lyr, arcs);
  var body = (returns ? 'return ' : '') + exp;
  var func;
  try {
    func = new Function("record,env", "with(env){with(record){ " + body + "}}");
  } catch(e) {
    stop(e.name, "in expression [" + exp + "]");
  }

  return function(rec, i) {
    var val;
    env.$.__setId(i);
    try {
      val = func.call(null, rec, env);
    } catch(e) {
      stop(e.name, "in expression [" + exp + "]:", e.message);
    }
    return val;
  };
};

MapShaper.getExpressionContext = function(lyr, arcs) {
  var env = MapShaper.getBaseContext();
  if (lyr.data) {
    // default to null values when a data field is missing
    lyr.data.getFields().forEach(function(f) {
      env[f] = null;
    });
  }
  env.$ = new FeatureExpressionContext(lyr, arcs);
  return env;
};

MapShaper.getBaseContext = function() {
  var obj = {};
  // Mask global properties (is this effective/worth doing?)
  (function() {
    for (var key in this) {
      obj[key] = null;
    }
  }());
  obj.console = console;
  return obj;
};


function addGetters(obj, getters) {
  Object.keys(getters).forEach(function(name) {
    Object.defineProperty(obj, name, {get: getters[name]});
  });
}

function FeatureExpressionContext(lyr, arcs) {
  var hasData = !!lyr.data,
      hasPoints = MapShaper.layerHasPoints(lyr),
      hasPaths = arcs && MapShaper.layerHasPaths(lyr),
      _isPlanar,
      _self = this,
      _centroid, _innerXY, _xy,
      _record, _records,
      _id, _ids, _bounds;

  if (hasData) {
    _records = lyr.data.getRecords();
    Object.defineProperty(this, 'properties',
      {set: function(obj) {
        if (utils.isObject(obj)) {
          _records[_id] = obj;
        } else {
          stop("Can't assign non-object to $.properties");
        }
      }, get: function() {
        var rec = _records[_id];
        if (!rec) {
          rec = _records[_id] = {};
        }
        return rec;
      }});
  }

  if (hasPaths) {
    _isPlanar = arcs.isPlanar();
    addGetters(this, {
      // TODO: count hole/s + containing ring as one part
      partCount: function() {
        return _ids ? _ids.length : 0;
      },
      isNull: function() {
        return this.partCount === 0;
      },
      bounds: function() {
        return shapeBounds().toArray();
      },
      height: function() {
        return shapeBounds().height();
      },
      width: function() {
        return shapeBounds().width();
      }
    });

    if (lyr.geometry_type == 'polygon') {
      addGetters(this, {
        area: function() {
          return _isPlanar ? geom.getPlanarShapeArea(_ids, arcs) : geom.getSphericalShapeArea(_ids, arcs);
        },
        originalArea: function() {
          var i = arcs.getRetainedInterval(),
              area;
          arcs.setRetainedInterval(0);
          area = _self.area;
          arcs.setRetainedInterval(i);
          return area;
        },
        centroidX: function() {
          var p = centroid();
          return p ? p.x : null;
        },
        centroidY: function() {
          var p = centroid();
          return p ? p.y : null;
        },
        innerX: function() {
          var p = innerXY();
          return p ? p.x : null;
        },
        innerY: function() {
          var p = innerXY();
          return p ? p.y : null;
        }
      });
    }

  } else if (hasPoints) {
    // TODO: add functions like bounds, isNull, pointCount
    Object.defineProperty(this, 'coordinates',
      {set: function(obj) {
        if (!obj || utils.isArray(obj)) {
          lyr.shapes[_id] = obj || null;
        } else {
          stop("Can't assign non-array to $.coordinates");
        }
      }, get: function() {
        return lyr.shapes[_id] || null;
      }});

    addGetters(this, {
      x: function() {
        xy();
        return _xy ? _xy[0] : null;
      },
      y: function() {
        xy();
        return _xy ? _xy[1] : null;
      }
    });
  }

  // all contexts have $.id
  addGetters(this, {id: function() { return _id; }});

  this.__setId = function(id) {
    _id = id;
    if (hasPaths) {
      _bounds = null;
      _centroid = null;
      _innerXY = null;
      _ids = lyr.shapes[id];
    }
    if (hasPoints) {
      _xy = null;
    }
    if (hasData) {
      _record = _records[id];
    }
  };

  function xy() {
    var shape = lyr.shapes[_id];
    if (!_xy) {
      _xy = shape && shape[0] || null;
    }
    return _xy;
  }

  function centroid() {
    _centroid = _centroid || geom.getShapeCentroid(_ids, arcs);
    return _centroid;
  }

  function innerXY() {
    _innerXY = _innerXY || geom.findInteriorPoint(_ids, arcs);
    return _innerXY;
  }

  function shapeBounds() {
    if (!_bounds) {
      _bounds = arcs.getMultiShapeBounds(_ids);
    }
    return _bounds;
  }
}




function dissolvePointLayerGeometry(lyr, getGroupId, opts) {
  var useSph = !opts.planar && MapShaper.probablyDecimalDegreeBounds(MapShaper.getLayerBounds(lyr));
  var getWeight = opts.weight ? MapShaper.compileValueExpression(opts.weight, lyr) : null;
  var groups = [];

  // TODO: support multipoints
  if (MapShaper.countMultiPartFeatures(lyr.shapes) !== 0) {
    stop("[dissolve] Dissolving multi-part points is not supported");
  }

  lyr.shapes.forEach(function(shp, i) {
    var groupId = getGroupId(i);
    var weight = getWeight ? getWeight(i) : 1;
    var p = shp && shp[0]; // Using first point (TODO: handle multi-point features)
    var tmp;
    if (!p) return;
    if (useSph) {
      tmp = [];
      lngLatToXYZ(p[0], p[1], tmp);
      p = tmp;
    }
    groups[groupId] = reducePointCentroid(groups[groupId], p, weight);
  });

  return groups.map(function(memo) {
    var p1, p2;
    if (!memo) return null;
    if (useSph) {
      p1 = memo.centroid;
      p2 = [];
      xyzToLngLat(p1[0], p1[1], p1[2], p2);
    } else {
      p2 = memo.centroid;
    }
    return memo ? [p2] : null;
  });
}

function reducePointCentroid(memo, p, weight) {
  var x = p[0],
      y = p[1],
      sum, k;

  if (x == x && y == y && weight > 0) {
    if (!memo) {
      memo = {sum: weight, centroid: p.concat()};
    } else {
      sum = memo.sum + weight;
      k = memo.sum / sum;
      memo.centroid[0] = k * memo.centroid[0] + weight * x / sum;
      memo.centroid[1] = k * memo.centroid[1] + weight * y / sum;
      if (p.length == 3) {
        memo.centroid[2] = k * memo.centroid[2] + weight * p[2] / sum;
      }
      memo.sum = sum;
    }
  }
  return memo;
}




function dissolvePolygonGeometry(shapes, getGroupId) {
  var segments = dissolveFirstPass(shapes, getGroupId);
  return dissolveSecondPass(segments, shapes, getGroupId);
}

// First pass -- identify pairs of segments that can be dissolved
function dissolveFirstPass(shapes, getGroupId) {
  var groups = [],
      largeGroups = [],
      segments = [],
      ids = shapes.map(function(shp, i) {
        return getGroupId(i);
      });

  MapShaper.traversePaths(shapes, procArc);
  largeGroups.forEach(splitGroup);
  return segments;

  function procArc(obj) {
    var arcId = obj.arcId,
        idx = arcId < 0 ? ~arcId : arcId,
        segId = segments.length,
        group = groups[idx];
    if (!group) {
      group = [];
      groups[idx] = group;
    }
    group.push(segId);
    obj.group = group;
    segments.push(obj);

    // Three or more segments sharing the same arc is abnormal topology...
    // Need to try to identify pairs of matching segments in each of these
    // groups.
    //
    if (group.length == 3) {
      largeGroups.push(group);
    }
  }

  function findMatchingPair(group, cb) {
    var arc1, arc2;
    for (var i=0; i<group.length - 1; i++) {
      arc1 = segments[group[i]];
      for (var j=i+1; j<group.length; j++) {
        arc2 = segments[group[j]];
        if (cb(arc1, arc2)) {
          return [arc1.segId, arc2.segId];
        }
      }
    }
    return null;
  }

  function checkFwExtension(arc1, arc2) {
    return getNextSegment(arc1, segments, shapes).arcId ===
        ~getNextSegment(arc2, segments, shapes).arcId;
  }

  function checkBwExtension(arc1, arc2) {
    return getPrevSegment(arc1, segments, shapes).arcId ===
        ~getPrevSegment(arc2, segments, shapes).arcId;
  }

  function checkDoubleExtension(arc1, arc2) {
    return checkPairwiseMatch(arc1, arc2) &&
        checkFwExtension(arc1, arc2) &&
        checkBwExtension(arc1, arc2);
  }

  function checkSingleExtension(arc1, arc2) {
    return checkPairwiseMatch(arc1, arc2) &&
        (checkFwExtension(arc1, arc2) ||
        checkBwExtension(arc1, arc2));
  }

  function checkPairwiseMatch(arc1, arc2) {
    return arc1.arcId === ~arc2.arcId && ids[arc1.shapeId] ===
        ids[arc2.shapeId];
  }

  function updateGroupIds(ids) {
    ids.forEach(function(id) {
      segments[id].group = ids;
    });
  }

  // split a group of segments into pairs of matching segments + a residual group
  // @group Array of segment ids
  //
  function splitGroup(group) {
    // find best-match segment pair
    var group2 = findMatchingPair(group, checkDoubleExtension) ||
        findMatchingPair(group, checkSingleExtension) ||
        findMatchingPair(group, checkPairwiseMatch);
    if (group2) {
      group = group.filter(function(i) {
        return !utils.contains(group2, i);
      });
      updateGroupIds(group);
      updateGroupIds(group2);
      // Split again if reduced group is still large
      if (group.length > 2) splitGroup(group);
    }
  }
}

// Second pass -- generate dissolved shapes
//
function dissolveSecondPass(segments, shapes, getGroupId) {
  var dissolveShapes = [];
  segments.forEach(procSegment);
  return dissolveShapes;

  // @obj is an arc instance
  function procSegment(obj) {
    if (obj.used) return;
    var match = findDissolveArc(obj);
    if (!match) buildRing(obj);
  }

  function addRing(arcs, i) {
    if (i in dissolveShapes === false) {
      dissolveShapes[i] = [];
    }
    dissolveShapes[i].push(arcs);
  }

  // Generate a dissolved ring
  // @firstArc the first arc instance in the ring
  //
  function buildRing(firstArc) {
    var newArcs = [firstArc.arcId],
        nextArc = getNextArc(firstArc);
        firstArc.used = true;

    while (nextArc && nextArc != firstArc) {
      newArcs.push(nextArc.arcId);
      nextArc.used = true;
      nextArc = getNextArc(nextArc);
      if (nextArc && nextArc != firstArc && nextArc.used) error("buildRing() topology error");
    }

    if (!nextArc) error("buildRing() traversal error");
    firstArc.used = true;
    addRing(newArcs, getGroupId(firstArc.shapeId));
  }

  // Get the next arc in a dissolved polygon ring
  // @obj an undissolvable arc instance
  //
  function getNextArc(obj, depth) {
    var next = getNextSegment(obj, segments, shapes),
        match;
    depth = depth || 0;
    if (next != obj) {
      match = findDissolveArc(next);
      if (match) {
        if (depth > 100) {
          error ('[dissolve] deep recursion -- unhandled topology problem');
        }
        // if (match.part.arcs.length == 1) {
        if (shapes[match.shapeId][match.partId].length == 1) {
          // case: @obj has an island inclusion -- keep traversing @obj
          // TODO: test case if @next is first arc in the ring
          next = getNextArc(next, depth + 1);
        } else {
          next = getNextArc(match, depth + 1);
        }
      }
    }
    return next;
  }

  // Look for an arc instance that can be dissolved with segment @obj
  // (must be going the opposite direction and have same dissolve key, etc)
  // Return matching segment or null if no match
  //
  function findDissolveArc(obj) {
    var dissolveId = getGroupId(obj.shapeId), // obj.shape.dissolveKey,
        match, matchId;
    matchId = utils.find(obj.group, function(i) {
      var a = obj,
          b = segments[i];
      if (a == b ||
          b.used ||
          getGroupId(b.shapeId) !== dissolveId ||
          // don't prevent rings from dissolving with themselves (risky?)
          // a.shapeId == b.shapeId && a.partId == b.partId ||
          a.arcId != ~b.arcId) return false;
      return true;
    });
    match = matchId === null ? null : segments[matchId];
    return match;
  }
}

function getNextSegment(seg, segments, shapes) {
  return getSegmentByOffs(seg, segments, shapes, 1);
}

function getPrevSegment(seg, segments, shapes) {
  return getSegmentByOffs(seg, segments, shapes, -1);
}

function getSegmentByOffs(seg, segments, shapes, offs) {
  var arcs = shapes[seg.shapeId][seg.partId],
      partLen = arcs.length,
      nextOffs = (seg.i + offs) % partLen,
      nextSeg;
  if (nextOffs < 0) nextOffs += partLen;
  nextSeg = segments[seg.segId - seg.i + nextOffs];
  if (!nextSeg || nextSeg.shapeId != seg.shapeId) error("index error");
  return nextSeg;
}




// Generate a dissolved layer
// @opts.field (optional) name of data field (dissolves all if falsy)
// @opts.sum-fields (Array) (optional)
// @opts.copy-fields (Array) (optional)
//
api.dissolve = function(lyr, arcs, o) {
  var opts = o || {},
      getGroupId = MapShaper.getCategoryClassifier(opts.field, lyr.data),
      dissolveShapes = null,
      dissolveData = null,
      lyr2;

  if (lyr.geometry_type == 'polygon') {
    dissolveShapes = dissolvePolygonGeometry(lyr.shapes, getGroupId);
  } else if (lyr.geometry_type == 'point') {
    dissolveShapes = dissolvePointLayerGeometry(lyr, getGroupId, opts);
  } else if (lyr.geometry_type) {
    stop("[dissolve] Only point and polygon geometries can be dissolved");
  }

  if (lyr.data) {
    dissolveData = MapShaper.aggregateDataRecords(lyr.data.getRecords(), getGroupId, opts);
    // replace missing shapes with nulls
    for (var i=0, n=dissolveData.length; i<n; i++) {
      if (dissolveShapes && !dissolveShapes[i]) {
        dissolveShapes[i] = null;
      }
    }
  }
  lyr2 = {
    name: opts.no_replace ? null : lyr.name,
    shapes: dissolveShapes,
    data: dissolveData ? new DataTable(dissolveData) : null,
    geometry_type: lyr.geometry_type
  };
  if (!opts.silent) {
    MapShaper.printDissolveMessage(lyr, lyr2);
  }
  return lyr2;
};

MapShaper.printDissolveMessage = function(pre, post, cmd) {
  var n1 = MapShaper.getFeatureCount(pre),
      n2 = MapShaper.getFeatureCount(post),
      msg = utils.format('[%s] Dissolved %,d feature%s into %,d feature%s',
        cmd || 'dissolve', n1, utils.pluralSuffix(n1), n2,
        utils.pluralSuffix(n2));
  message(msg);
};




api.dissolve2 = function(lyr, dataset, opts) {
  MapShaper.requirePolygonLayer(lyr, "[dissolve2] Expected a polygon type layer");
  var nodes = MapShaper.divideArcs(dataset);
  return MapShaper.dissolvePolygonLayer(lyr, nodes, opts);
};

MapShaper.dissolvePolygonLayer = function(lyr, nodes, opts) {
  opts = opts || {};
  var getGroupId = MapShaper.getCategoryClassifier(opts.field, lyr.data);
  var groups = lyr.shapes.reduce(function(groups, shape, i) {
    var i2 = getGroupId(i);
    if (i2 in groups === false) {
      groups[i2] = [];
    }
    MapShaper.extendShape(groups[i2], shape);
    return groups;
  }, []);
  var dissolve = MapShaper.getPolygonDissolver(nodes);
  var lyr2, data2;

  T.start();
  if (lyr.data) {
    data2 = new DataTable(MapShaper.aggregateDataRecords(lyr.data.getRecords(), getGroupId, opts));
  }
  lyr2 = {
    name: opts.no_replace ? null : lyr.name,
    data: data2,
    shapes: groups.map(dissolve),
    geometry_type: lyr.geometry_type
  };
  T.stop('dissolve2');
  MapShaper.printDissolveMessage(lyr, lyr2, 'dissolve2');
  return lyr2;
};

MapShaper.concatShapes = function(shapes) {
  return shapes.reduce(function(memo, shape) {
    MapShaper.extendShape(memo, shape);
    return memo;
  }, []);
};

MapShaper.extendShape = function(dest, src) {
  if (src) {
    for (var i=0, n=src.length; i<n; i++) {
      dest.push(src[i]);
    }
  }
};

MapShaper.getPolygonDissolver = function(nodes, spherical) {
  spherical = spherical && !nodes.arcs.isPlanar();
  var flags = new Uint8Array(nodes.arcs.size());
  var divide = MapShaper.getHoleDivider(nodes, spherical);
  var flatten = MapShaper.getRingIntersector(nodes, 'flatten', flags, spherical);
  var dissolve = MapShaper.getRingIntersector(nodes, 'dissolve', flags, spherical);

  return function(shp) {
    if (!shp) return null;
    var cw = [],
        ccw = [];

    divide(shp, cw, ccw);
    cw = flatten(cw);
    ccw.forEach(MapShaper.reversePath);
    ccw = flatten(ccw);
    ccw.forEach(MapShaper.reversePath);

    var shp2 = MapShaper.appendHolestoRings(cw, ccw);
    var dissolved = dissolve(shp2);
    return dissolved.length > 0 ? dissolved : null;
  };
};

// TODO: to prevent invalid holes,
// could erase the holes from the space-enclosing rings.
MapShaper.appendHolestoRings = function(cw, ccw) {
  for (var i=0, n=ccw.length; i<n; i++) {
    cw.push(ccw[i]);
  }
  return cw;
};




// assumes layers and arcs have been prepared for clipping
MapShaper.clipPolygons = function(targetShapes, clipShapes, nodes, type) {
  var arcs = nodes.arcs;
  var clipFlags = new Uint8Array(arcs.size());
  var routeFlags = new Uint8Array(arcs.size());
  var clipArcTouches = 0;
  var clipArcUses = 0;
  var usedClipArcs = [];
  var dividePath = MapShaper.getPathFinder(nodes, useRoute, routeIsActive, chooseRoute);
  var dissolvePolygon = MapShaper.getPolygonDissolver(nodes);

  // clean each target polygon by dissolving its rings
  targetShapes = targetShapes.map(dissolvePolygon);

  // merge rings of clip/erase polygons and dissolve them all
  clipShapes = [dissolvePolygon(MapShaper.concatShapes(clipShapes))];

  // Open pathways in the clip/erase layer
  // Need to expose clip/erase routes in both directions by setting route
  // in both directions to visible -- this is how cut-out shapes are detected
  // Or-ing with 0x11 makes both directions visible (so reverse paths will block)
  MapShaper.openArcRoutes(clipShapes, arcs, clipFlags, type == 'clip', type == 'erase', !!"dissolve", 0x11);

  var index = new PathIndex(clipShapes, arcs);
  var clippedShapes = targetShapes.map(function(shape) {
    if (shape) {
      return clipPolygon(shape, type, index);
    }
    return null;
  });

  // add clip/erase polygons that are fully contained in a target polygon
  // need to index only non-intersecting clip shapes
  // (Intersecting shapes have one or more arcs that have been scanned)
  //
  var undividedClipShapes = findUndividedClipShapes(clipShapes);

  MapShaper.closeArcRoutes(clipShapes, arcs, routeFlags, true, true); // not needed?
  index = new PathIndex(undividedClipShapes, arcs);
  targetShapes.forEach(function(shape, shapeId) {
    var paths = shape ? findInteriorPaths(shape, type, index) : null;
    if (paths) {
      clippedShapes[shapeId] = (clippedShapes[shapeId] || []).concat(paths);
    }
  });

  return clippedShapes;

  function clipPolygon(shape, type, index) {
    var dividedShape = [],
        clipping = type == 'clip',
        erasing = type == 'erase';

    // open pathways for entire polygon rather than one ring at a time --
    // need to create polygons that connect positive-space rings and holes
    MapShaper.openArcRoutes(shape, arcs, routeFlags, true, false, false);

    MapShaper.forEachPath(shape, function(ids) {
      var path;
      for (var i=0, n=ids.length; i<n; i++) {
        clipArcTouches = 0;
        clipArcUses = 0;
        path = dividePath(ids[i]);
        if (path) {
          // if ring doesn't touch/intersect a clip/erase polygon, check if it is contained
          // if (clipArcTouches === 0) {
          // if ring doesn't incorporate an arc from the clip/erase polygon,
          // check if it is contained (assumes clip shapes are dissolved)
          if (clipArcTouches === 0 || clipArcUses === 0) { //
            var contained = index.pathIsEnclosed(path);
            if (clipping && contained || erasing && !contained) {
              dividedShape.push(path);
            }
            // TODO: Consider breaking if polygon is unchanged
          } else {
            dividedShape.push(path);
          }
        }
      }
    });

    // Clear pathways of current target shape to hidden/closed
    MapShaper.closeArcRoutes(shape, arcs, routeFlags, true, true, true);
    // Also clear pathways of any clip arcs that were used
    if (usedClipArcs.length > 0) {
      MapShaper.closeArcRoutes(usedClipArcs, arcs, routeFlags, true, true, true);
      usedClipArcs = [];
    }

    return dividedShape.length === 0 ? null : dividedShape;
  }

  function routeIsActive(id) {
    var fw = id >= 0,
        abs = fw ? id : ~id,
        visibleBit = fw ? 1 : 0x10,
        targetBits = routeFlags[abs],
        clipBits = clipFlags[abs];

    if (clipBits > 0) clipArcTouches++;
    return (targetBits & visibleBit) > 0 || (clipBits & visibleBit) > 0;
  }

  function useRoute(id) {
    var fw = id >= 0,
        abs = fw ? id : ~id,
        targetBits = routeFlags[abs],
        clipBits = clipFlags[abs],
        targetRoute, clipRoute;

    if (fw) {
      targetRoute = targetBits;
      clipRoute = clipBits;
    } else {
      targetRoute = targetBits >> 4;
      clipRoute = clipBits >> 4;
    }
    targetRoute &= 3;
    clipRoute &= 3;

    var usable = false;
    // var usable = targetRoute === 3 || targetRoute === 0 && clipRoute == 3;
    if (targetRoute == 3) {
      // special cases where clip route and target route both follow this arc
      if (clipRoute == 1) {
        // 1. clip/erase polygon blocks this route, not usable
      } else if (clipRoute == 2 && type == 'erase') {
        // 2. route is on the boundary between two erase polygons, not usable
      } else {
        usable = true;
      }

    } else if (targetRoute === 0 && clipRoute == 3) {
      usedClipArcs.push(id);
      usable = true;
    }

    if (usable) {
      if (clipRoute == 3) {
        clipArcUses++;
      }
      // Need to close all arcs after visiting them -- or could cause a cycle
      //   on layers with strange topology
      if (fw) {
        targetBits = MapShaper.setBits(targetBits, 1, 3);
      } else {
        targetBits = MapShaper.setBits(targetBits, 0x10, 0x30);
      }
    }

    targetBits |= fw ? 4 : 0x40; // record as visited
    routeFlags[abs] = targetBits;
    return usable;
  }

  function chooseRoute(id1, angle1, id2, angle2, prevId) {
    var selection = 1;
    if (angle1 == angle2) {
      // less likely now that congruent arcs are prevented in updateArcIds()
      var bits2 = MapShaper.getRouteBits(id2, routeFlags);
      if (bits2 == 3) { // route2 follows a target layer arc; prefer it
        selection = 2;
      }
    } else {
      // prefer right-hand angle
      if (angle2 < angle1) {
        selection = 2;
      }
    }
    return selection;
  }

  // Filter a collection of shapes to exclude paths that contain clip/erase arcs
  // and paths that are hidden (e.g. internal boundaries)
  function findUndividedClipShapes(clipShapes) {
    return clipShapes.map(function(shape) {
      var usableParts = [];
      MapShaper.forEachPath(shape, function(ids) {
        var pathIsClean = true,
            pathIsVisible = false;
        for (var i=0; i<ids.length; i++) {
          // check if arc was used in fw or rev direction
          if (!arcIsUnused(ids[i], routeFlags)) {
            pathIsClean = false;
            break;
          }
          // check if clip arc is visible
          if (!pathIsVisible && arcIsVisible(ids[i], clipFlags)) {
            pathIsVisible = true;
          }
        }
        if (pathIsClean && pathIsVisible) usableParts.push(ids);
      });
      return usableParts.length > 0 ? usableParts : null;
    });
  }

  // Test if arc is unused in both directions
  // (not testing open/closed or visible/hidden)
  function arcIsUnused(id, flags) {
    var abs = absArcId(id),
        flag = flags[abs];
        return (flag & 0x44) === 0;
  }

  function arcIsVisible(id, flags) {
    var flag = flags[absArcId(id)];
    return (flag & 0x11) > 0;
  }

  // search for indexed clipping paths contained in a shape
  // dissolve them if needed
  function findInteriorPaths(shape, type, index) {
    var enclosedPaths = index.findPathsInsideShape(shape),
        dissolvedPaths = [];
    if (!enclosedPaths) return null;
    // ...
    if (type == 'erase') enclosedPaths.forEach(MapShaper.reversePath);
    if (enclosedPaths.length <= 1) {
      dissolvedPaths = enclosedPaths; // no need to dissolve single-part paths
    } else {
      MapShaper.openArcRoutes(enclosedPaths, arcs, routeFlags, true, false, true);
      enclosedPaths.forEach(function(ids) {
        var path;
        for (var j=0; j<ids.length; j++) {
          path = dividePath(ids[j]);
          if (path) {
            dissolvedPaths.push(path);
          }
        }
      });
    }

    return dissolvedPaths.length > 0 ? dissolvedPaths : null;
  }
}; // end clipPolygons()




// Assumes: Arcs have been divided
//
MapShaper.clipPolylines = function(targetShapes, clipShapes, nodes, type) {
  var index = new PathIndex(clipShapes, nodes.arcs);

  return targetShapes.map(function(shp) {
    return clipPolyline(shp);
  });

  function clipPolyline(shp) {
    var clipped = shp.reduce(clipPath, []);
    return clipped.length > 0 ? clipped : null;
  }

  function clipPath(memo, path) {
    var clippedPath = null,
        arcId, enclosed;
    for (var i=0; i<path.length; i++) {
      arcId = path[i];
      enclosed = index.arcIsEnclosed(arcId);
      if (enclosed && type == 'clip' || !enclosed && type == 'erase') {
        if (!clippedPath) {
          memo.push(clippedPath = []);
        }
        clippedPath.push(arcId);
      } else {
        clippedPath = null;
      }
    }
    return memo;
  }
};




//
MapShaper.clipPoints = function(points, clipShapes, arcs, type) {
  var index = new PathIndex(clipShapes, arcs);

  var points2 = points.reduce(function(memo, feat) {
    var n = feat ? feat.length : 0,
        feat2 = [],
        enclosed;

    for (var i=0; i<n; i++) {
      enclosed = index.findEnclosingShape(feat[i]) > -1;
      if (type == 'clip' && enclosed || type == 'erase' && !enclosed) {
        feat2.push(feat[i].concat());
      }
    }

    memo.push(feat2.length > 0 ? feat2 : null);
    return memo;
  }, []);

  return points2;
};




// Dissolve arcs that can be merged without affecting topology of layers
// remove arcs that are not referenced by any layer; remap arc ids
// in layers. (In-place).
MapShaper.dissolveArcs = function(dataset) {
  var arcs = dataset.arcs,
      layers = dataset.layers.filter(MapShaper.layerHasPaths),
      test = MapShaper.getArcDissolveTest(layers, arcs),
      groups = [],
      totalPoints = 0,
      arcIndex = new Int32Array(arcs.size()), // maps old arc ids to new ids
      arcStatus = new Uint8Array(arcs.size());
      // arcStatus: 0 = unvisited, 1 = dropped, 2 = remapped, 3 = remapped + reversed
  layers.forEach(function(lyr) {
    // modify copies of the original shapes; original shapes should be unmodified
    // (need to test this)
    lyr.shapes = lyr.shapes.map(function(shape) {
      return MapShaper.editPaths(shape && shape.concat(), translatePath);
    });
  });
  MapShaper.dissolveArcCollection(arcs, groups, totalPoints);

  function translatePath(path) {
    var pointCount = 0;
    var path2 = [];
    var group, arcId, absId, arcLen, fw, arcId2;

    for (var i=0, n=path.length; i<n; i++) {
      arcId = path[i];
      absId = absArcId(arcId);
      fw = arcId === absId;

      if (arcs.arcIsDegenerate(arcId)) {
        // skip
      } else if (arcStatus[absId] === 0) {
        arcLen = arcs.getArcLength(arcId);

        if (group && test(path[i-1], arcId)) {
          if (arcLen > 0) {
            arcLen--; // shared endpoint not counted;
          }
          group.push(arcId);  // arc data is appended to previous arc
          arcStatus[absId] = 1; // arc is dropped from output
        } else {
          // new group (i.e. new dissolved arc)
          group = [arcId];
          arcIndex[absId] = groups.length;
          groups.push(group);
          arcStatus[absId] = fw ? 2 : 3; // 2: unchanged; 3: reversed
        }
        pointCount += arcLen;
      } else {
        group = null;
      }

      if (arcStatus[absId] > 1) {
        // arc is retained (and renumbered) in the dissolved path.
        arcId2 = arcIndex[absId];
        if (fw && arcStatus[absId] == 3 || !fw && arcStatus[absId] == 2) {
          arcId2 = ~arcId2;
        }
        path2.push(arcId2);
      }
    }
    totalPoints += pointCount;
    return path2;
  }
};

MapShaper.dissolveArcCollection = function(arcs, groups, len2) {
  var nn2 = new Uint32Array(groups.length),
      xx2 = new Float64Array(len2),
      yy2 = new Float64Array(len2),
      src = arcs.getVertexData(),
      zz2 = src.zz ? new Float64Array(len2) : null,
      offs = 0;

  groups.forEach(function(group, newId) {
    group.forEach(function(oldId, i) {
      extendDissolvedArc(oldId, newId);
    });
  });

  arcs.updateVertexData(nn2, xx2, yy2, zz2);

  function extendDissolvedArc(oldId, newId) {
    var absId = absArcId(oldId),
        rev = oldId < 0,
        n = src.nn[absId],
        i = src.ii[absId],
        n2 = nn2[newId];

    if (n > 0) {
      if (n2 > 0) {
        n--;
        if (!rev) i++;
      }
      utils.copyElements(src.xx, i, xx2, offs, n, rev);
      utils.copyElements(src.yy, i, yy2, offs, n, rev);
      if (zz2) utils.copyElements(src.zz, i, zz2, offs, n, rev);
      nn2[newId] += n;
      offs += n;
    }
  }
};

MapShaper.getArcDissolveTest = function(layers, arcs) {
  var nodes = MapShaper.getFilteredNodeCollection(layers, arcs),
      count = 0,
      lastId;

  return function(id1, id2) {
    if (id1 == id2 || id1 == ~id2) {
      verbose("Unexpected arc sequence:", id1, id2);
      return false; // This is unexpected; don't try to dissolve, anyway
    }
    count = 0;
    nodes.forEachConnectedArc(id1, countArc);
    return count == 1 && lastId == ~id2;
  };

  function countArc(arcId, i) {
    count++;
    lastId = arcId;
  }
};

MapShaper.getFilteredNodeCollection = function(layers, arcs) {
  var counts = MapShaper.countArcReferences(layers, arcs),
      test = function(arcId) {
        return counts[absArcId(arcId)] > 0;
      };
  return new NodeCollection(arcs, test);
};

MapShaper.countArcReferences = function(layers, arcs) {
  var counts = new Uint32Array(arcs.size());
  layers.forEach(function(lyr) {
    MapShaper.countArcsInShapes(lyr.shapes, counts);
  });
  return counts;
};




api.filterFeatures = function(lyr, arcs, opts) {
  var records = lyr.data ? lyr.data.getRecords() : null,
      shapes = lyr.shapes || null,
      n = MapShaper.getFeatureCount(lyr),
      filteredShapes = shapes ? [] : null,
      filteredRecords = records ? [] : null,
      filteredLyr = MapShaper.getOutputLayer(lyr, opts),
      filter;

  if (opts.expression) {
    filter = MapShaper.compileValueExpression(opts.expression, lyr, arcs);
  }

  if (opts.remove_empty) {
    filter = MapShaper.combineFilters(filter, MapShaper.getNullGeometryFilter(lyr, arcs));
  }

  if (!filter) {
    stop("[filter] Missing a filter expression");
  }

  utils.repeat(n, function(shapeId) {
    var result = filter(shapeId);
    if (result === true) {
      if (shapes) filteredShapes.push(shapes[shapeId] || null);
      if (records) filteredRecords.push(records[shapeId] || null);
    } else if (result !== false) {
      stop("[filter] Expression must return true or false");
    }
  });

  filteredLyr.shapes = filteredShapes;
  filteredLyr.data = filteredRecords ? new DataTable(filteredRecords) : null;
  if (opts.no_replace) {
    // if adding a layer, don't share objects between source and filtered layer
    filteredLyr = MapShaper.copyLayer(filteredLyr);
  }

  if (opts.verbose !== false) {
    message(utils.format('[filter] Retained %,d of %,d features', MapShaper.getFeatureCount(filteredLyr), n));
  }

  return filteredLyr;
};

MapShaper.getNullGeometryFilter = function(lyr, arcs) {
  var shapes = lyr.shapes;
  if (lyr.geometry_type == 'polygon') {
    return MapShaper.getEmptyPolygonFilter(shapes, arcs);
  }
  return function(i) {return !!shapes[i];};
};

MapShaper.getEmptyPolygonFilter = function(shapes, arcs) {
  return function(i) {
    var shp = shapes[i];
    return !!shp && geom.getPlanarShapeArea(shapes[i], arcs) > 0;
  };
};

MapShaper.combineFilters = function(a, b) {
  return (a && b && function(id) {
      return a(id) && b(id);
    }) || a || b;
};




api.filterIslands = function(lyr, arcs, opts) {
  var removed = 0;
  if (lyr.geometry_type != 'polygon') {
    return;
  }

  if (opts.min_area || opts.min_vertices) {
    if (opts.min_area) {
      removed += MapShaper.filterIslands(lyr, arcs, MapShaper.getMinAreaTest(opts.min_area, arcs));
    }
    if (opts.min_vertices) {
      removed += MapShaper.filterIslands(lyr, arcs, MapShaper.getVertexCountTest(opts.min_vertices, arcs));
    }
    if (opts.remove_empty) {
      api.filterFeatures(lyr, arcs, {remove_empty: true, verbose: false});
    }
    message(utils.format("Removed %'d island%s", removed, utils.pluralSuffix(removed)));
  } else {
    message("[filter-islands] Missing a criterion for filtering islands; use min-area or min-vertices");
  }
};

MapShaper.getVertexCountTest = function(minVertices, arcs) {
  return function(path) {
    // first and last vertex in ring count as one
    return geom.countVerticesInPath(path, arcs) <= minVertices;
  };
};

MapShaper.getMinAreaTest = function(minArea, arcs) {
  var pathArea = arcs.isPlanar() ? geom.getPlanarPathArea : geom.getSphericalPathArea;
  return function(path) {
    var area = pathArea(path, arcs);
    return Math.abs(area) < minArea;
  };
};

MapShaper.filterIslands = function(lyr, arcs, ringTest) {
  var removed = 0;
  var counts = new Uint8Array(arcs.size());
  MapShaper.countArcsInShapes(lyr.shapes, counts);

  var pathFilter = function(path, i, paths) {
    if (path.length == 1) { // got an island ring
      if (counts[absArcId(path[0])] === 1) { // and not part of a donut hole
        if (!ringTest || ringTest(path)) { // and it meets any filtering criteria
          // and it does not contain any holes itself
          // O(n^2), so testing this last
          if (!MapShaper.ringHasHoles(path, paths, arcs)) {
            removed++;
            return null;
          }
        }
      }
    }
  };
  MapShaper.filterShapes(lyr.shapes, pathFilter);
  return removed;
};

MapShaper.ringIntersectsBBox = function(ring, bbox, arcs) {
  for (var i=0, n=ring.length; i<n; i++) {
    if (arcs.arcIntersectsBBox(absArcId(ring[i]), bbox)) {
      return true;
    }
  }
  return false;
};

// Assumes that ring boundaries to not cross
MapShaper.ringHasHoles = function(ring, rings, arcs) {
  var bbox = arcs.getSimpleShapeBounds2(ring);
  var sibling, p;
  for (var i=0, n=rings.length; i<n; i++) {
    sibling = rings[i];
    // try to avoid expensive point-in-ring test
    if (sibling && sibling != ring && MapShaper.ringIntersectsBBox(sibling, bbox, arcs)) {
      p = arcs.getVertex(sibling[0], 0);
      if (geom.testPointInRing(p.x, p.y, ring, arcs)) {
        return true;
      }
    }
  }
  return false;
};

MapShaper.filterShapes = function(shapes, pathFilter) {
  var shapeFilter = function(paths) {
    return MapShaper.editPaths(paths, pathFilter);
  };
  for (var i=0, n=shapes.length; i<n; i++) {
    shapes[i] = shapeFilter(shapes[i]);
  }
};




// Remove small-area polygon rings (very simple implementation of sliver removal)
// TODO: more sophisticated sliver detection (e.g. could consider ratio of area to perimeter)
// TODO: consider merging slivers into adjacent polygons to prevent gaps from forming
// TODO: consider separate gap removal function as an alternative to merging slivers
//
api.filterSlivers = function(lyr, arcs, opts) {
  if (lyr.geometry_type != 'polygon') {
    return 0;
  }
  return MapShaper.filterSlivers(lyr, arcs, opts);
};

MapShaper.filterSlivers = function(lyr, arcs, opts) {
  var ringTest = opts && opts.min_area ? MapShaper.getMinAreaTest(opts.min_area, arcs) :
    MapShaper.getSliverTest(arcs);
  var removed = 0;
  var pathFilter = function(path, i, paths) {
    if (ringTest(path)) {
      removed++;
      return null;
    }
  };

  MapShaper.filterShapes(lyr.shapes, pathFilter);
  return removed;
};

MapShaper.filterClipSlivers = function(lyr, clipLyr, arcs) {
  var flags = new Uint8Array(arcs.size());
  var ringTest = MapShaper.getSliverTest(arcs);
  var removed = 0;
  var pathFilter = function(path) {
    var prevArcs = 0,
        newArcs = 0;
    for (var i=0, n=path && path.length || 0; i<n; i++) {
      if (flags[absArcId(path[i])] > 0) {
        newArcs++;
      } else {
        prevArcs++;
      }
    }
    // filter paths that contain arcs from both original and clip/erase layers
    //   and are small
    if (newArcs > 0 && prevArcs > 0 && ringTest(path)) {
      removed++;
      return null;
    }
  };

  MapShaper.countArcsInShapes(clipLyr.shapes, flags);
  MapShaper.filterShapes(lyr.shapes, pathFilter);
  return removed;
};

MapShaper.getSliverTest = function(arcs) {
  var maxSliverArea = MapShaper.calcMaxSliverArea(arcs);
  return function(path) {
    // TODO: more sophisticated metric, perhaps considering shape
    return Math.abs(geom.getPlanarPathArea(path, arcs)) <= maxSliverArea;
  };
};


// Calculate an area threshold based on the average segment length,
// but disregarding very long segments (i.e. bounding boxes)
// TODO: need something more reliable
// consider: calculating the distribution of segment lengths in one pass
//
MapShaper.calcMaxSliverArea = function(arcs) {
  var k = 2,
      dxMax = arcs.getBounds().width() / k,
      dyMax = arcs.getBounds().height() / k,
      count = 0,
      mean = 0;
  arcs.forEachSegment(function(i, j, xx, yy) {
    var dx = Math.abs(xx[i] - xx[j]),
        dy = Math.abs(yy[i] - yy[j]);
    if (dx < dxMax && dy < dyMax) {
      // TODO: write utility function for calculating mean this way
      mean += (Math.sqrt(dx * dx + dy * dy) - mean) / ++count;
    }
  });
  return mean * mean;
};




api.clipLayers = function(target, src, dataset, opts) {
  return MapShaper.clipLayers(target, src, dataset, "clip", opts);
};

api.eraseLayers = function(target, src, dataset, opts) {
  return MapShaper.clipLayers(target, src, dataset, "erase", opts);
};

api.clipLayer = function(targetLyr, src, dataset, opts) {
  return api.clipLayers([targetLyr], src, dataset, opts)[0];
};

api.eraseLayer = function(targetLyr, src, dataset, opts) {
  return api.eraseLayers([targetLyr], src, dataset, opts)[0];
};

// @clipSrc: layer in @dataset or filename
// @type: 'clip' or 'erase'
MapShaper.clipLayers = function(targetLayers, clipSrc, dataset, type, opts) {
  var clipLyr, clipDataset;
  opts = opts || {no_cleanup: true}; // TODO: update testing functions

  // check if clip source is another layer in the same dataset
  clipLyr = MapShaper.findClippingLayer(clipSrc, dataset);
  if (clipLyr) {
    clipDataset = dataset;
  } else {
    if (opts.bbox) {
      // use bbox for clipping
      clipDataset = MapShaper.convertClipBounds(opts.bbox);
    } else {
      // use external file for clipping (assume clipSrc is a filename)
      clipDataset = MapShaper.loadExternalClipLayer(clipSrc, opts);
    }
    if (!clipDataset || clipDataset.layers.length != 1) {
      stop("[clip/erase] Missing clipping data");
    }
    clipLyr = clipDataset.layers[0];
  }
  MapShaper.requirePolygonLayer(clipLyr, "[" + type + "] Requires a polygon clipping layer");
  return MapShaper.clipLayersByLayer(targetLayers, dataset, clipLyr, clipDataset, type, opts);
};

MapShaper.clipLayersByLayer = function(targetLayers, targetDataset, clipLyr, clipDataset, type, opts) {
  var usingPathClip = utils.some(targetLayers, MapShaper.layerHasPaths);
  var usingExternalDataset = targetDataset != clipDataset;
  var nullCount = 0, sliverCount = 0,
      nodes, outputLayers, mergedDataset;

  if (usingExternalDataset) {
    // merge external dataset with target dataset,
    // so arcs are shared between target layers and clipping lyr
    mergedDataset = MapShaper.mergeDatasets([targetDataset, clipDataset]);
    api.buildTopology(mergedDataset); // identify any shared arcs between clipping layer and target dataset
    targetDataset.arcs = mergedDataset.arcs; // replace arcs in original dataset with merged arcs

  } else {
    mergedDataset = targetDataset;
  }

  if (usingPathClip) {
    // add vertices at all line intersections
    nodes = MapShaper.divideArcs(mergedDataset);
  }

  outputLayers = targetLayers.map(function(targetLyr) {
    var shapeCount = targetLyr.shapes ? targetLyr.shapes.length : 0;
    var clippedShapes, outputLyr;
    if (targetLyr === clipLyr) {
      stop('[' + type + '] Can\'t clip a layer with itself');
    } else if (targetLyr.geometry_type == 'point') {
      clippedShapes = MapShaper.clipPoints(targetLyr.shapes, clipLyr.shapes, mergedDataset.arcs, type);
    } else if (targetLyr.geometry_type == 'polygon') {
      clippedShapes = MapShaper.clipPolygons(targetLyr.shapes, clipLyr.shapes, nodes, type);
    } else if (targetLyr.geometry_type == 'polyline') {
      clippedShapes = MapShaper.clipPolylines(targetLyr.shapes, clipLyr.shapes, nodes, type);
    } else {
      stop('[' + type + '] Invalid target layer:', targetLyr.name);
    }

    outputLyr = MapShaper.getOutputLayer(targetLyr, opts);
    if (opts.no_replace && targetLyr.data) {
      outputLyr.data = targetLyr.data.clone();
    }
    outputLyr.shapes = clippedShapes;

    // Remove sliver polygons
    if (opts.remove_slivers && outputLyr.geometry_type == 'polygon') {
      sliverCount += MapShaper.filterClipSlivers(outputLyr, clipLyr, targetDataset.arcs);
    }

    // Remove null shapes (likely removed by clipping/erasing, although possibly already present)
    api.filterFeatures(outputLyr, targetDataset.arcs, {remove_empty: true, verbose: false});
    nullCount += shapeCount - outputLyr.shapes.length;
    return outputLyr;
  });

  // integrate output layers into target dataset
  // (doing this here instead of in runCommand() to allow arc cleaning)
  if (opts.no_replace) {
    targetDataset.layers = targetDataset.layers.concat(outputLayers);
  } else {
    MapShaper.replaceLayers(targetDataset, targetLayers, outputLayers);
  }

  if (usingPathClip && !opts.no_cleanup) {
    // Delete unused arcs, merge remaining arcs, remap arcs of retained shapes.
    // This is to remove arcs belonging to the clipping paths from the target
    // dataset, and to heal the cuts that were made where clipping paths
    // crossed target paths
    MapShaper.dissolveArcs(targetDataset);
  }

  if (nullCount && sliverCount) {
    message(MapShaper.getClipMessage(type, nullCount, sliverCount));
  }
  return outputLayers;
};


MapShaper.getClipMessage = function(type, nullCount, sliverCount) {
  var nullMsg = nullCount ? utils.format('%,d null feature%s', nullCount, utils.pluralSuffix(nullCount)) : '';
  var sliverMsg = sliverCount ? utils.format('%,d sliver%s', sliverCount, utils.pluralSuffix(sliverCount)) : '';
  if (nullMsg || sliverMsg) {
    return utils.format('[%s] Removed %s%s%s', type, nullMsg, (nullMsg && sliverMsg ? ' and ' : ''), sliverMsg);
  }
  return '';
};

// see if @clipSrc is a layer in @dataset
MapShaper.findClippingLayer = function(clipSrc, dataset) {
  var layers, lyr;
  if (utils.isObject(clipSrc) && utils.contains(dataset.layers, clipSrc)) {
    lyr = clipSrc;
  } else if (utils.isString(clipSrc)) {
    // see if clipSrc is a layer name
    layers = MapShaper.findMatchingLayers(dataset.layers, clipSrc);
    if (layers.length > 1) {
      stop("[clip/erase] Received more than one source layer");
    } else if (layers.length == 1) {
      lyr = layers[0];
    }
  }
  return lyr || null;
};

// try to load a clipping layer from a file
MapShaper.loadExternalClipLayer = function(path, opts) {
  // Load clip file without topology (topology is built later, together with target dataset)
  var dataset = api.importFile(path, utils.defaults({no_topology: true}, opts));
  if (!dataset) {
    stop("Unable to find file [" + path + "]");
  }
  if (dataset.layers.length != 1) {
    // TODO: handle multi-layer sources, e.g. TopoJSON files
    stop("Clip/erase only supports clipping with single-layer datasets");
  }
  return dataset;
};

MapShaper.convertClipBounds = function(bb) {
  var x0 = bb[0], y0 = bb[1], x1 = bb[2], y1 = bb[3],
      arc = [[x0, y0], [x0, y1], [x1, y1], [x1, y0], [x0, y0]];

  if (!(y1 > y0 && x1 > x0)) {
    stop("[clip/erase] Invalid bbox (should be [xmin, ymin, xmax, ymax]):", bb);
  }
  return {
    arcs: new ArcCollection([arc]),
    layers: [{
      shapes: [[[0]]],
      geometry_type: 'polygon'
    }]
  };
};




var GeoJSON = {};
GeoJSON.ID_FIELD = "FID"; // default field name of imported *JSON feature ids

GeoJSON.typeLookup = {
  LineString: 'polyline',
  MultiLineString: 'polyline',
  Polygon: 'polygon',
  MultiPolygon: 'polygon',
  Point: 'point',
  MultiPoint: 'point'
};

GeoJSON.translateGeoJSONType = function(type) {
  return GeoJSON.typeLookup[type] || null;
};




// Get function to Hash an x, y point to a non-negative integer
function getXYHash(size) {
  var buf = new ArrayBuffer(16),
      floats = new Float64Array(buf),
      uints = new Uint32Array(buf),
      lim = size | 0;
  if (lim > 0 === false) {
    throw new Error("Invalid size param: " + size);
  }

  return function(x, y) {
    var u = uints, h;
    floats[0] = x;
    floats[1] = y;
    h = u[0] ^ u[1];
    h = h << 5 ^ h >> 7 ^ u[2] ^ u[3];
    return (h & 0x7fffffff) % lim;
  };
}

// Get function to Hash a single coordinate to a non-negative integer
function getXHash(size) {
  var buf = new ArrayBuffer(8),
      floats = new Float64Array(buf),
      uints = new Uint32Array(buf),
      lim = size | 0;
  if (lim > 0 === false) {
    throw new Error("Invalid size param: " + size);
  }

  return function(x) {
    var h;
    floats[0] = x;
    h = uints[0] ^ uints[1];
    h = h << 5 ^ h >> 7;
    return (h & 0x7fffffff) % lim;
  };
}




// Used for building topology
//
function ArcIndex(pointCount) {
  var hashTableSize = Math.floor(pointCount * 0.25 + 1),
      hash = getXYHash(hashTableSize),
      hashTable = new Int32Array(hashTableSize),
      chainIds = [],
      arcs = [],
      arcPoints = 0;

  utils.initializeArray(hashTable, -1);

  this.addArc = function(xx, yy) {
    var end = xx.length - 1,
        key = hash(xx[end], yy[end]),
        chainId = hashTable[key],
        arcId = arcs.length;
    hashTable[key] = arcId;
    arcs.push([xx, yy]);
    arcPoints += xx.length;
    chainIds.push(chainId);
    return arcId;
  };

  // Look for a previously generated arc with the same sequence of coords, but in the
  // opposite direction. (This program uses the convention of CW for space-enclosing rings, CCW for holes,
  // so coincident boundaries should contain the same points in reverse sequence).
  //
  this.findMatchingArc = function(xx, yy, start, end, getNext, getPrev) {
    // First, look for a reverse match
    var arcId = findArcNeighbor(xx, yy, start, end, getNext);
    if (arcId === null) {
      // Look for forward match
      // (Abnormal topology, but we're accepting it because in-the-wild
      // Shapefiles sometimes have duplicate paths)
      arcId = findArcNeighbor(xx, yy, end, start, getPrev);
    } else {
      arcId = ~arcId;
    }
    return arcId;
  };

  function findArcNeighbor(xx, yy, start, end, getNext) {
    var next = getNext(start),
        key = hash(xx[start], yy[start]),
        arcId = hashTable[key],
        arcX, arcY, len;

    while (arcId != -1) {
      // check endpoints and one segment...
      // it would be more rigorous but slower to identify a match
      // by comparing all segments in the coordinate sequence
      arcX = arcs[arcId][0];
      arcY = arcs[arcId][1];
      len = arcX.length;
      if (arcX[0] === xx[end] && arcX[len-1] === xx[start] && arcX[len-2] === xx[next] &&
          arcY[0] === yy[end] && arcY[len-1] === yy[start] && arcY[len-2] === yy[next]) {
        return arcId;
      }
      arcId = chainIds[arcId];
    }
    return null;
  }

  this.getVertexData = function() {
    var xx = new Float64Array(arcPoints),
        yy = new Float64Array(arcPoints),
        nn = new Uint32Array(arcs.length),
        copied = 0,
        arc, len;
    for (var i=0, n=arcs.length; i<n; i++) {
      arc = arcs[i];
      len = arc[0].length;
      utils.copyElements(arc[0], 0, xx, copied, len);
      utils.copyElements(arc[1], 0, yy, copied, len);
      nn[i] = len;
      copied += len;
    }
    return {
      xx: xx,
      yy: yy,
      nn: nn
    };
  };
}




function initHashChains(xx, yy) {
  // Performance doesn't improve much above ~1.3 * point count
  var n = xx.length,
      m = Math.floor(n * 1.3) || 1,
      hash = getXYHash(m),
      hashTable = new Int32Array(m),
      chainIds = new Int32Array(n), // Array to be filled with chain data
      key, j;

  for (var i=0; i<n; i++) {
    key = hash(xx[i], yy[i]);
    j = hashTable[key] - 1; // coord ids are 1-based in hash table; 0 used as null value.
    hashTable[key] = i + 1;
    chainIds[i] = j < 0 ? i : j; // first item in a chain points to self
  }
  return chainIds;
}

function initPointChains(xx, yy) {
  var chainIds = initHashChains(xx, yy),
      j, next, prevMatchId, prevUnmatchId;

  // disentangle, reverse and close the chains created by initHashChains()
  for (var i = xx.length-1; i>=0; i--) {
    next = chainIds[i];
    if (next >= i) continue;
    prevMatchId = i;
    prevUnmatchId = -1;
    do {
      j = next;
      next = chainIds[j];
      if (yy[j] == yy[i] && xx[j] == xx[i]) {
        chainIds[j] = prevMatchId;
        prevMatchId = j;
      } else {
        if (prevUnmatchId > -1) {
          chainIds[prevUnmatchId] = j;
        }
        prevUnmatchId = j;
      }
    } while (next < j);
    if (prevUnmatchId > -1) {
      // Make sure last unmatched entry is terminated
      chainIds[prevUnmatchId] = prevUnmatchId;
    }
    chainIds[i] = prevMatchId; // close the chain
  }
  return chainIds;
}




// Converts all polygon and polyline paths in a dataset to a topological format,
// (in-place);
api.buildTopology = function(dataset) {
  if (!dataset.arcs) return;
  var raw = dataset.arcs.getVertexData(),
      cooked = MapShaper.buildPathTopology(raw.nn, raw.xx, raw.yy);
  dataset.arcs.updateVertexData(cooked.nn, cooked.xx, cooked.yy);
  dataset.layers.forEach(function(lyr) {
    if (lyr.geometry_type == 'polyline' || lyr.geometry_type == 'polygon') {
      lyr.shapes = MapShaper.replaceArcIds(lyr.shapes, cooked.paths);
    }
  });
};

// buildPathTopology() converts non-topological paths into
// a topological format
//
// Arguments:
//    xx: [Array|Float64Array],   // x coords of each point in the dataset
//    yy: [Array|Float64Array],   // y coords ...
//    nn: [Array]  // length of each path
//
// (x- and y-coords of all paths are concatenated into two arrays)
//
// Returns:
// {
//    xx, yy (array)   // coordinate data
//    nn: (array)      // points in each arc
//    paths: (array)   // Paths are arrays of one or more arc id.
// }
//
// Negative arc ids in the paths array indicate a reversal of arc -(id + 1)
//
MapShaper.buildPathTopology = function(nn, xx, yy) {
  var pointCount = xx.length,
      chainIds = initPointChains(xx, yy),
      pathIds = initPathIds(pointCount, nn),
      index = new ArcIndex(pointCount),
      slice = usingTypedArrays() ? xx.subarray : Array.prototype.slice,
      paths, retn;
  paths = convertPaths(nn);
  retn = index.getVertexData();
  retn.paths = paths;
  return retn;

  function usingTypedArrays() {
    return !!(xx.subarray && yy.subarray);
  }

  function convertPaths(nn) {
    var paths = [],
        pointId = 0,
        pathLen;
    for (var i=0, len=nn.length; i<len; i++) {
      pathLen = nn[i];
      paths.push(pathLen < 2 ? null : convertPath(pointId, pointId + pathLen - 1));
      pointId += pathLen;
    }
    return paths;
  }

  function nextPoint(id) {
    var partId = pathIds[id],
        nextId = id + 1;
    if (nextId < pointCount && pathIds[nextId] === partId) {
      return id + 1;
    }
    var len = nn[partId];
    return sameXY(id, id - len + 1) ? id - len + 2 : -1;
  }

  function prevPoint(id) {
    var partId = pathIds[id],
        prevId = id - 1;
    if (prevId >= 0 && pathIds[prevId] === partId) {
      return id - 1;
    }
    var len = nn[partId];
    return sameXY(id, id + len - 1) ? id + len - 2 : -1;
  }

  function sameXY(a, b) {
    return xx[a] == xx[b] && yy[a] == yy[b];
  }

  // Convert a non-topological path to one or more topological arcs
  // @start, @end are ids of first and last points in the path
  // TODO: don't allow id ~id pairs
  //
  function convertPath(start, end) {
    var arcIds = [],
        firstNodeId = -1,
        arcStartId;

    // Visit each point in the path, up to but not including the last point
    for (var i = start; i < end; i++) {
      if (pointIsArcEndpoint(i)) {
        if (firstNodeId > -1) {
          arcIds.push(addEdge(arcStartId, i));
        } else {
          firstNodeId = i;
        }
        arcStartId = i;
      }
    }

    // Identify the final arc in the path
    if (firstNodeId == -1) {
      // Not in an arc, i.e. no nodes have been found...
      // Assuming that path is either an island or is congruent with one or more rings
      arcIds.push(addRing(start, end));
    }
    else if (firstNodeId == start) {
      // path endpoint is a node;
      if (!pointIsArcEndpoint(end)) {
        error("Topology error"); // TODO: better error handling
      }
      arcIds.push(addEdge(arcStartId, i));
    } else {
      // final arc wraps around
      arcIds.push(addSplitEdge(arcStartId, end, start + 1, firstNodeId));
    }
    return arcIds;
  }

  // Test if a point @id is an endpoint of a topological path
  function pointIsArcEndpoint(id) {
    var id2 = chainIds[id],
        prev = prevPoint(id),
        next = nextPoint(id),
        prev2, next2;
    if (prev == -1 || next == -1) {
      // @id is an endpoint if it is the start or end of an open path
      return true;
    }
    while (id != id2) {
      prev2 = prevPoint(id2);
      next2 = nextPoint(id2);
      if (prev2 == -1 || next2 == -1 || brokenEdge(prev, next, prev2, next2)) {
        // there is a discontinuity at @id -- point is arc endpoint
        return true;
      }
      id2 = chainIds[id2];
    }
    return false;
  }

  // a and b are two vertices with the same x, y coordinates
  // test if the segments on either side of them are also identical
  function brokenEdge(aprev, anext, bprev, bnext) {
    var apx = xx[aprev],
        anx = xx[anext],
        bpx = xx[bprev],
        bnx = xx[bnext],
        apy = yy[aprev],
        any = yy[anext],
        bpy = yy[bprev],
        bny = yy[bnext];
    if (apx == bnx && anx == bpx && apy == bny && any == bpy ||
        apx == bpx && anx == bnx && apy == bpy && any == bny) {
      return false;
    }
    return true;
  }

  function mergeArcParts(src, startId, endId, startId2, endId2) {
    var len = endId - startId + endId2 - startId2 + 2,
        ArrayClass = usingTypedArrays() ? Float64Array : Array,
        dest = new ArrayClass(len),
        j = 0, i;
    for (i=startId; i <= endId; i++) {
      dest[j++] = src[i];
    }
    for (i=startId2; i <= endId2; i++) {
      dest[j++] = src[i];
    }
    return dest;
  }

  function addSplitEdge(start1, end1, start2, end2) {
    var arcId = index.findMatchingArc(xx, yy, start1, end2, nextPoint, prevPoint);
    if (arcId === null) {
      arcId = index.addArc(mergeArcParts(xx, start1, end1, start2, end2),
          mergeArcParts(yy, start1, end1, start2, end2));
    }
    return arcId;
  }

  function addEdge(start, end) {
    // search for a matching edge that has already been generated
    var arcId = index.findMatchingArc(xx, yy, start, end, nextPoint, prevPoint);
    if (arcId === null) {
      arcId = index.addArc(slice.call(xx, start, end + 1),
          slice.call(yy, start, end + 1));
    }
    return arcId;
  }

  function addRing(startId, endId) {
    var chainId = chainIds[startId],
        pathId = pathIds[startId],
        arcId;

    while (chainId != startId) {
      if (pathIds[chainId] < pathId) {
        break;
      }
      chainId = chainIds[chainId];
    }

    if (chainId == startId) {
      return addEdge(startId, endId);
    }

    for (var i=startId; i<endId; i++) {
      arcId = index.findMatchingArc(xx, yy, i, i, nextPoint, prevPoint);
      if (arcId !== null) return arcId;
    }
    error("Unmatched ring; id:", pathId, "len:", nn[pathId]);
  }
};


// Create a lookup table for path ids; path ids are indexed by point id
//
function initPathIds(size, pathSizes) {
  var pathIds = new Int32Array(size),
      j = 0;
  for (var pathId=0, pathCount=pathSizes.length; pathId < pathCount; pathId++) {
    for (var i=0, n=pathSizes[pathId]; i<n; i++, j++) {
      pathIds[j] = pathId;
    }
  }
  return pathIds;
}

MapShaper.replaceArcIds = function(src, replacements) {
  return src.map(function(shape) {
    return replaceArcsInShape(shape, replacements);
  });

  function replaceArcsInShape(shape, replacements) {
    if (!shape) return null;
    return shape.map(function(path) {
      return replaceArcsInPath(path, replacements);
    });
  }

  function replaceArcsInPath(path, replacements) {
    return path.reduce(function(memo, id) {
      var abs = absArcId(id);
      var topoPath = replacements[abs];
      if (topoPath) {
        if (id < 0) {
          topoPath = topoPath.concat(); // TODO: need to copy?
          MapShaper.reversePath(topoPath);
        }
        for (var i=0, n=topoPath.length; i<n; i++) {
          memo.push(topoPath[i]);
        }
      }
      return memo;
    }, []);
  }
};




MapShaper.getHighPrecisionSnapInterval = function(arcs) {
  var bb = arcs.getBounds();
  if (!bb.hasBounds()) return 0;
  var maxCoord = Math.max(Math.abs(bb.xmin), Math.abs(bb.ymin),
      Math.abs(bb.xmax), Math.abs(bb.ymax));
  return maxCoord * 1e-14;
};

MapShaper.snapCoords = function(arcs, threshold) {
    var avgDist = MapShaper.getAvgSegment(arcs),
        autoSnapDist = avgDist * 0.0025,
        snapDist = autoSnapDist;

  if (threshold > 0) {
    snapDist = threshold;
    message(utils.format("Applying snapping threshold of %s -- %.6f times avg. segment length", threshold, threshold / avgDist));
  }

  var snapCount = MapShaper.snapCoordsByInterval(arcs, snapDist);
  if (snapCount > 0) arcs.dedupCoords();
  message(utils.format("Snapped %s point%s", snapCount, utils.pluralSuffix(snapCount)));
};

// Snap together points within a small threshold
//
MapShaper.snapCoordsByInterval = function(arcs, snapDist) {
  var snapCount = 0,
      data = arcs.getVertexData();

  // Get sorted coordinate ids
  // Consider: speed up sorting -- try bucket sort as first pass.
  //
  var ids = utils.sortCoordinateIds(data.xx);
  for (var i=0, n=ids.length; i<n; i++) {
    snapCount += snapPoint(i, snapDist, ids, data.xx, data.yy);
  }
  return snapCount;

  function snapPoint(i, limit, ids, xx, yy) {
    var j = i,
        n = ids.length,
        x = xx[ids[i]],
        y = yy[ids[i]],
        snaps = 0,
        id2, dx, dy;

    while (++j < n) {
      id2 = ids[j];
      dx = xx[id2] - x;
      if (dx > limit) break;
      dy = yy[id2] - y;
      if (dx === 0 && dy === 0 || dx * dx + dy * dy > limit * limit) continue;
      xx[id2] = x;
      yy[id2] = y;
      snaps++;
    }
    return snaps;
  }
};

utils.sortCoordinateIds = function(a) {
  var n = a.length,
      ids = new Uint32Array(n);
  for (var i=0; i<n; i++) {
    ids[i] = i;
  }
  utils.quicksortIds(a, ids, 0, ids.length-1);
  return ids;
};

/*
// Returns array of array ids, in ascending order.
// @a array of numbers
//
utils.sortCoordinateIds = function(a) {
  return utils.bucketSortIds(a);
};

// This speeds up sorting of large datasets (~2x faster for 1e7 values)
// worth the additional code?
utils.bucketSortIds = function(a, n) {
  var len = a.length,
      ids = new Uint32Array(len),
      bounds = utils.getArrayBounds(a),
      buckets = Math.ceil(n > 0 ? n : len / 10),
      counts = new Uint32Array(buckets),
      offsets = new Uint32Array(buckets),
      i, j, offs, count;

  // get bucket sizes
  for (i=0; i<len; i++) {
    j = bucketId(a[i], bounds.min, bounds.max, buckets);
    counts[j]++;
  }

  // convert counts to offsets
  offs = 0;
  for (i=0; i<buckets; i++) {
    offsets[i] = offs;
    offs += counts[i];
  }

  // assign ids to buckets
  for (i=0; i<len; i++) {
    j = bucketId(a[i], bounds.min, bounds.max, buckets);
    offs = offsets[j]++;
    ids[offs] = i;
  }

  // sort each bucket with quicksort
  for (i = 0; i<buckets; i++) {
    count = counts[i];
    if (count > 1) {
      offs = offsets[i] - count;
      utils.quicksortIds(a, ids, offs, offs + count - 1);
    }
  }
  return ids;

  function bucketId(val, min, max, buckets) {
    var id = (buckets * (val - min) / (max - min)) | 0;
    return id < buckets ? id : buckets - 1;
  }
};
*/

utils.quicksortIds = function (a, ids, lo, hi) {
  if (hi - lo > 24) {
    var pivot = a[ids[lo + hi >> 1]],
        i = lo,
        j = hi,
        tmp;
    while (i <= j) {
      while (a[ids[i]] < pivot) i++;
      while (a[ids[j]] > pivot) j--;
      if (i <= j) {
        tmp = ids[i];
        ids[i] = ids[j];
        ids[j] = tmp;
        i++;
        j--;
      }
    }
    if (j > lo) utils.quicksortIds(a, ids, lo, j);
    if (i < hi) utils.quicksortIds(a, ids, i, hi);
  } else {
    utils.insertionSortIds(a, ids, lo, hi);
  }
};

utils.insertionSortIds = function(arr, ids, start, end) {
  var id, i, j;
  for (j = start + 1; j <= end; j++) {
    id = ids[j];
    for (i = j - 1; i >= start && arr[id] < arr[ids[i]]; i--) {
      ids[i+1] = ids[i];
    }
    ids[i+1] = id;
  }
};




// Accumulates points in buffers until #endPath() is called
// @drain callback: function(xarr, yarr, size) {}
//
function PathImportStream(drain) {
  var buflen = 10000,
      xx = new Float64Array(buflen),
      yy = new Float64Array(buflen),
      i = 0;

  this.endPath = function() {
    drain(xx, yy, i);
    i = 0;
  };

  this.addPoint = function(x, y) {
    if (i >= buflen) {
      buflen = Math.ceil(buflen * 1.3);
      xx = utils.extendBuffer(xx, buflen);
      yy = utils.extendBuffer(yy, buflen);
    }
    xx[i] = x;
    yy[i] = y;
    i++;
  };
}

// Import path data from a non-topological source (Shapefile, GeoJSON, etc)
// in preparation for identifying topology.
// @opts.reserved_points -- estimate of points in dataset, for pre-allocating buffers
//
function PathImporter(opts) {
  var bufSize = opts.reserved_points > 0 ? opts.reserved_points : 20000,
      xx = new Float64Array(bufSize),
      yy = new Float64Array(bufSize),
      shapes = [],
      nn = [],
      collectionType = opts.type || null, // possible values: polygon, polyline, point
      round = null,
      pathId = -1,
      shapeId = -1,
      pointId = 0,
      dupeCount = 0,
      skippedPathCount = 0,
      openRingCount = 0;

  if (opts.precision) {
    round = getRoundingFunction(opts.precision);
  }

  // mix in #addPoint() and #endPath() methods
  utils.extend(this, new PathImportStream(importPathCoords));

  this.startShape = function() {
    shapes[++shapeId] = null;
  };

  this.importLine = function(points) {
    setShapeType('polyline');
    this.importPath(points);
  };

  this.importPoints = function(points) {
    setShapeType('point');
    if (round) {
      points.forEach(function(p) {
        p[0] = round(p[0]);
        p[1] = round(p[1]);
      });
    }
    points.forEach(appendToShape);
  };

  this.importRing = function(points, isHole) {
    var area = geom.getPlanarPathArea2(points);
    setShapeType('polygon');
    if (isHole === true && area > 0 || isHole === false && area < 0) {
      verbose("Warning: reversing", isHole ? "a CW hole" : "a CCW ring");
      points.reverse();
    }
    this.importPath(points);
  };

  // Import an array of [x, y] Points
  this.importPath = function importPath(points) {
    var p;
    for (var i=0, n=points.length; i<n; i++) {
      p = points[i];
      this.addPoint(p[0], p[1]);
    }
    this.endPath();
  };

  // Return topological shape data
  // Apply any requested snapping and rounding
  // Remove duplicate points, check for ring inversions
  //
  this.done = function() {
    var arcs;
    var lyr = {name: ''};

    if (collectionType == 'polygon' || collectionType == 'polyline') {

      if (dupeCount > 0) {
        verbose(utils.format("Removed %,d duplicate point%s", dupeCount, utils.pluralSuffix(dupeCount)));
      }
      if (skippedPathCount > 0) {
        // TODO: consider showing details about type of error
        message(utils.format("Removed %,d path%s with defective geometry", skippedPathCount, utils.pluralSuffix(skippedPathCount)));
      }
      if (openRingCount > 0) {
        message(utils.format("Closed %,d open polygon ring%s", openRingCount, utils.pluralSuffix(openRingCount)));
      }

      if (pointId > 0) {
        if (pointId < xx.length) {
          xx = xx.subarray(0, pointId);
          yy = yy.subarray(0, pointId);
        }
        arcs = new ArcCollection(nn, xx, yy);

        if (opts.auto_snap || opts.snap_interval) {
          MapShaper.snapCoords(arcs, opts.snap_interval);
        }
        // Detect and handle some geometry problems
        // TODO: print message summarizing any changes
        MapShaper.cleanShapes(shapes, arcs, collectionType);
      } else {
        message("No geometries were imported");
        collectionType = null;
      }
    } else if (collectionType == 'point' || collectionType === null) {
      // pass
    } else {
      error("Unexpected collection type:", collectionType);
    }

    // If shapes are all null, don't add a shapes array or geometry_type
    if (collectionType) {
      lyr.geometry_type = collectionType;
      lyr.shapes = shapes;
    }

    return {
      arcs: arcs || null,
      info: {},
      layers: [lyr]
    };
  };

  function setShapeType(t) {
    if (!collectionType) {
      collectionType = t;
    } else if (t != collectionType) {
      stop("[PathImporter] Mixed feature types are not allowed");
    }
  }

  function checkBuffers(needed) {
    if (needed > xx.length) {
      var newLen = Math.max(needed, Math.ceil(xx.length * 1.5));
      xx = utils.extendBuffer(xx, newLen, pointId);
      yy = utils.extendBuffer(yy, newLen, pointId);
    }
  }

  function appendToShape(part) {
    var currShape = shapes[shapeId] || (shapes[shapeId] = []);
    currShape.push(part);
  }

  function appendPath(n) {
    pathId++;
    nn[pathId] = n;
    appendToShape([pathId]);
  }

  function importPathCoords(xsrc, ysrc, n) {
    var count = 0;
    var x, y, prevX, prevY;
    checkBuffers(pointId + n);
    for (var i=0; i<n; i++) {
      x = xsrc[i];
      y = ysrc[i];
      if (round) {
        x = round(x);
        y = round(y);
      }
      if (i > 0 && x == prevX && y == prevY) {
        dupeCount++;
      } else {
        xx[pointId] = x;
        yy[pointId] = y;
        pointId++;
        count++;
      }
      prevY = y;
      prevX = x;
    }

    // check for open rings
    if (collectionType == 'polygon' && count > 0) {
      if (xsrc[0] != xsrc[n-1] || ysrc[0] != ysrc[n-1]) {
        checkBuffers(pointId + 1);
        xx[pointId] = xsrc[0];
        yy[pointId] = ysrc[0];
        openRingCount++;
        pointId++;
        count++;
      }
    }

    appendPath(count);
  }

}




MapShaper.importGeoJSON = function(src, opts) {
  var srcObj = utils.isString(src) ? JSON.parse(src) : src,
      supportedGeometries = Object.keys(GeoJSON.pathImporters),
      idField = opts.id_field || GeoJSON.ID_FIELD,
      properties = null,
      geometries, srcCollection, importer, dataset;

  // Convert single feature or geometry into a collection with one member
  if (srcObj.type == 'Feature') {
    srcCollection = {
      type: 'FeatureCollection',
      features: [srcObj]
    };
  } else if (utils.contains(supportedGeometries, srcObj.type)) {
    srcCollection = {
      type: 'GeometryCollection',
      geometries: [srcObj]
    };
  } else {
    srcCollection = srcObj;
  }

  if (srcCollection.type == 'FeatureCollection') {
    properties = [];
    geometries = srcCollection.features.map(function(feat) {
      var rec = feat.properties || {};
      if ('id' in feat) {
        rec[idField] = feat.id;
      }
      properties.push(rec);
      return feat.geometry;
    });
  } else if (srcCollection.type == 'GeometryCollection') {
    geometries = srcCollection.geometries;
  } else {
    stop("[i] Unsupported GeoJSON type:", srcCollection.type);
  }

  if (!geometries) {
    stop("[i] Missing geometry data");
  }

  // Import GeoJSON geometries
  importer = new PathImporter(opts);
  geometries.forEach(function(geom) {
    importer.startShape();
    if (geom) {
      GeoJSON.importGeometry(geom, importer);
    }
  });
  dataset = importer.done();

  if (properties) {
    dataset.layers[0].data = new DataTable(properties);
  }
  MapShaper.importCRS(dataset, srcObj);

  return dataset;
};

GeoJSON.importGeometry = function(geom, importer) {
  var type = geom.type;
  if (type in GeoJSON.pathImporters) {
    GeoJSON.pathImporters[type](geom.coordinates, importer);
  } else if (type == 'GeometryCollection') {
    geom.geometries.forEach(function(geom) {
      GeoJSON.importGeometry(geom, importer);
    });
  } else {
    verbose("TopoJSON.importGeometryCollection() Unsupported geometry type:", geom.type);
  }
};

// Functions for importing geometry coordinates using a PathImporter
//
GeoJSON.pathImporters = {
  LineString: function(coords, importer) {
    importer.importLine(coords);
  },
  MultiLineString: function(coords, importer) {
    for (var i=0; i<coords.length; i++) {
      GeoJSON.pathImporters.LineString(coords[i], importer);
    }
  },
  Polygon: function(coords, importer) {
    for (var i=0; i<coords.length; i++) {
      importer.importRing(coords[i], i > 0);
    }
  },
  MultiPolygon: function(coords, importer) {
    for (var i=0; i<coords.length; i++) {
      GeoJSON.pathImporters.Polygon(coords[i], importer);
    }
  },
  Point: function(coord, importer) {
    importer.importPoints([coord]);
  },
  MultiPoint: function(coords, importer) {
    importer.importPoints(coords);
  }
};

MapShaper.importCRS = function(dataset, jsonObj) {
  if ('crs' in jsonObj) {
    dataset.info.input_crs = jsonObj.crs;
  }
};




MapShaper.getFormattedStringify = function(numArrayKeys) {
  var keyIndex = utils.arrayToIndex(numArrayKeys);
  var sentinel = '\u1000\u2FD5\u0310';
  var stripRxp = new RegExp('"' + sentinel + '|' + sentinel + '"', 'g');
  var indentChars = '  ';

  function replace(key, val) {
    // We want to format numerical arrays like [1, 2, 3] instead of
    // the way JSON.stringify() behaves when applying indentation.
    // This kludge converts arrays to strings with sentinel strings inside the
    // surrounding quotes. At the end, the sentinel strings and quotes
    // are replaced by array brackets.
    if (key in keyIndex && utils.isArray(val)) {
      var str = JSON.stringify(val);
      // make sure the array does not contain any strings
      if (str.indexOf('"' == -1)) {
        return sentinel + str.replace(/,/g, ', ') + sentinel;
      }
    }
    return val;
  }

  return function(obj) {
    var json = JSON.stringify(obj, replace, indentChars);
    return json.replace(stripRxp, '');
  };
};




MapShaper.exportPointData = function(points) {
  var data, path;
  if (!points || points.length === 0) {
    data = {partCount: 0, pointCount: 0};
  } else {
    path = {
      points: points,
      pointCount: points.length,
      bounds: geom.getPathBounds(points)
    };
    data = {
      bounds: path.bounds,
      pathData: [path],
      partCount: 1,
      pointCount: path.pointCount
    };
  }
  return data;
};

// TODO: remove duplication with MapShaper.getPathMetadata()
MapShaper.exportPathData = function(shape, arcs, type) {
  // kludge until Shapefile exporting is refactored
  if (type == 'point') return MapShaper.exportPointData(shape);

  var pointCount = 0,
      bounds = new Bounds(),
      paths = [];

  if (shape && (type == 'polyline' || type == 'polygon')) {
    shape.forEach(function(arcIds, i) {
      var iter = arcs.getShapeIter(arcIds),
          path = MapShaper.exportPathCoords(iter),
          valid = true;
      if (type == 'polygon') {
        path.area = geom.getPlanarPathArea2(path.points);
        valid = path.pointCount > 3 && path.area !== 0;
      } else if (type == 'polyline') {
        valid = path.pointCount > 1;
      }
      if (valid) {
        pointCount += path.pointCount;
        path.bounds = geom.getPathBounds(path.points);
        bounds.mergeBounds(path.bounds);
        paths.push(path);
      } else {
        verbose("Skipping a collapsed", type, "path");
      }
    });
  }

  return {
    pointCount: pointCount,
    pathData: paths,
    pathCount: paths.length,
    bounds: bounds
  };
};

MapShaper.exportPathCoords = function(iter) {
  var points = [],
      i = 0,
      x, y, prevX, prevY;
  while (iter.hasNext()) {
    x = iter.x;
    y = iter.y;
    if (i === 0 || prevX != x || prevY != y) {
      points.push([x, y]);
      i++;
    }
    prevX = x;
    prevY = y;
  }
  return {
    points: points,
    pointCount: points.length
  };
};




MapShaper.exportGeoJSON = function(dataset, opts) {
  var extension = "json";
  if (opts.output_file) {
    // override default output extension if output filename is given
    extension = utils.getFileExtension(opts.output_file);
  }
  return dataset.layers.map(function(lyr) {
    return {
      content: MapShaper.exportGeoJSONCollection(lyr, dataset, opts, true),
      filename: lyr.name ? lyr.name + '.' + extension : ""
    };
  });
};

MapShaper.exportGeoJSONCollection = function(lyr, dataset, opts, asString) {
  opts = opts || {};
  var properties = MapShaper.exportProperties(lyr.data, opts),
      shapes = lyr.shapes,
      ids = MapShaper.exportIds(lyr.data, opts),
      useFeatures = !!(properties || ids),
      geojson = {},
      collection, collname, bounds, stringify;

  if (properties && shapes && properties.length !== shapes.length) {
    error("[-o] Mismatch between number of properties and number of shapes");
  }

  if (asString) {
    stringify = opts.prettify ? MapShaper.getFormattedStringify(['bbox', 'coordinates']) :
      JSON.stringify;
  }

  if (useFeatures) {
    geojson.type = 'FeatureCollection';
    collname = 'features';
  } else {
    geojson.type = 'GeometryCollection';
    collname = 'geometries';
  }

  MapShaper.exportCRS(dataset, geojson);
  if (opts.bbox) {
    bounds = MapShaper.getLayerBounds(lyr, dataset.arcs);
    if (bounds.hasBounds()) {
      geojson.bbox = bounds.toArray();
    }
  }

  collection = (shapes || properties || []).reduce(function(memo, o, i) {
    var shape = shapes ? shapes[i] : null,
        exporter = GeoJSON.exporters[lyr.geometry_type],
        obj = shape ? exporter(shape, dataset.arcs) : null;
    if (useFeatures) {
      obj = {
        type: 'Feature',
        geometry: obj,
        properties: properties ? properties[i] : null
      };
      if (ids) {
        obj.id = ids[i];
      }
    } else if (!obj) {
      return memo; // don't add null objects to GeometryCollection
    }
    if (asString) {
      // stringify features as soon as they are generated, to reduce the
      // number of JS objects in memory (so larger files can be exported)
      obj = stringify(obj);
    }
    memo.push(obj);
    return memo;
  }, []);

  if (asString) {
    geojson[collname] = ["$"];
    geojson = JSON.stringify(geojson).replace('"$"', '\n' + collection.join(',\n') + '\n');
  } else {
    geojson[collname] = collection;
  }
  return geojson;
};

// export GeoJSON or TopoJSON point geometry
GeoJSON.exportPointGeom = function(points, arcs) {
  var geom = null;
  if (points.length == 1) {
    geom = {
      type: "Point",
      coordinates: points[0]
    };
  } else if (points.length > 1) {
    geom = {
      type: "MultiPoint",
      coordinates: points
    };
  }
  return geom;
};

GeoJSON.exportLineGeom = function(ids, arcs) {
  var obj = MapShaper.exportPathData(ids, arcs, "polyline");
  if (obj.pointCount === 0) return null;
  var coords = obj.pathData.map(function(path) {
    return path.points;
  });
  return coords.length == 1 ? {
    type: "LineString",
    coordinates: coords[0]
  } : {
    type: "MultiLineString",
    coordinates: coords
  };
};

GeoJSON.exportPolygonGeom = function(ids, arcs) {
  var obj = MapShaper.exportPathData(ids, arcs, "polygon");
  if (obj.pointCount === 0) return null;
  var groups = MapShaper.groupPolygonRings(obj.pathData);
  var coords = groups.map(function(paths) {
    return paths.map(function(path) {
      return path.points;
    });
  });
  return coords.length == 1 ? {
    type: "Polygon",
    coordinates: coords[0]
  } : {
    type: "MultiPolygon",
    coordinates: coords
  };
};

GeoJSON.exporters = {
  polygon: GeoJSON.exportPolygonGeom,
  polyline: GeoJSON.exportLineGeom,
  point: GeoJSON.exportPointGeom
};

// @jsonObj is a top-level GeoJSON or TopoJSON object
MapShaper.exportCRS = function(dataset, jsonObj) {
  var info = dataset.info || {};
  if ('output_crs' in info) {
    jsonObj.crs = info.output_crs;
  } else if ('input_crs' in info) {
    jsonObj.crs = info.input_crs;
  }
};

// @opt value of id-field option (empty, string or array of strings)
// @fields array
MapShaper.getIdField = function(fields, opt) {
  var ids = [];
  if (utils.isString(opt)) {
    ids.push(opt);
  } else if (utils.isArray(opt)) {
    ids = opt;
  }
  ids.push(GeoJSON.ID_FIELD); // default id field
  return utils.find(ids, function(name) {
    return utils.contains(fields, name);
  });
};

MapShaper.exportProperties = function(table, opts) {
  var fields = table ? table.getFields() : [],
      idField = MapShaper.getIdField(fields, opts.id_field),
      deleteId = idField == GeoJSON.ID_FIELD, // delete default field, not user-set fields
      properties, records;
  if (opts.drop_table || opts.cut_table || fields.length === 0 || deleteId && fields.length == 1) {
    return null;
  }
  records = table.getRecords();
  if (deleteId) {
    properties = records.map(function(rec) {
      rec = utils.extend({}, rec); // copy rec;
      delete rec[idField];
      return rec;
    });
  } else {
    properties = records;
  }
  return properties;
};

MapShaper.exportIds = function(table, opts) {
  var fields = table ? table.getFields() : [],
      idField = MapShaper.getIdField(fields, opts.id_field);
  if (!idField) return null;
  return table.getRecords().map(function(rec) {
    return idField in rec ? rec[idField] : null;
  });
};







var TopoJSON = {};

// Iterate over all arrays of arc is in a geometry object
// @cb callback: function(ids)
// callback returns undefined or an array of replacement ids
//
TopoJSON.forEachPath = function forEachPath(obj, cb) {
  var iterators = {
        GeometryCollection: function(o) {o.geometries.forEach(eachGeom);},
        LineString: function(o) {
          var retn = cb(o.arcs);
          if (retn) o.arcs = retn;
        },
        MultiLineString: function(o) {eachMultiPath(o.arcs);},
        Polygon: function(o) {eachMultiPath(o.arcs);},
        MultiPolygon: function(o) {o.arcs.forEach(eachMultiPath);}
      };

  eachGeom(obj);

  function eachGeom(o) {
    if (o.type in iterators) {
      iterators[o.type](o);
    }
  }

  function eachMultiPath(arr) {
    var retn;
    for (var i=0; i<arr.length; i++) {
      retn = cb(arr[i]);
      if (retn) arr[i] = retn;
    }
  }
};

TopoJSON.forEachArc = function forEachArc(obj, cb) {
  TopoJSON.forEachPath(obj, function(ids) {
    var retn;
    for (var i=0; i<ids.length; i++) {
      retn = cb(ids[i]);
      if (utils.isInteger(retn)) {
        ids[i] = retn;
      }
    }
  });
};




// Convert a TopoJSON topology into mapshaper's internal format
// Side-effect: data in topology is modified
//
MapShaper.importTopoJSON = function(topology, opts) {
  var layers = [],
      dataset, arcs;

  if (utils.isString(topology)) {
    topology = JSON.parse(topology);
  }

  if (topology.arcs && topology.arcs.length > 0) {
    // TODO: apply transform to ArcCollection, not input arcs
    if (topology.transform) {
      TopoJSON.decodeArcs(topology.arcs, topology.transform);
    }

    if (opts && opts.precision) {
      TopoJSON.roundCoords(topology.arcs, opts.precision);
    }

    arcs = new ArcCollection(topology.arcs);
  }

  utils.forEachProperty(topology.objects, function(object, name) {
    var lyr = TopoJSON.importObject(object, opts);

    if (MapShaper.layerHasPaths(lyr)) {
      MapShaper.cleanShapes(lyr.shapes, arcs, lyr.geometry_type);
    }

    lyr.name = name;
    layers.push(lyr);
  });

  dataset = {
    layers: layers,
    arcs: arcs,
    info: {}
  };

  MapShaper.importCRS(dataset, topology);

  return dataset;
};


TopoJSON.decodeArcs = function(arcs, transform) {
  var mx = transform.scale[0],
      my = transform.scale[1],
      bx = transform.translate[0],
      by = transform.translate[1];

  arcs.forEach(function(arc) {
    var prevX = 0,
        prevY = 0,
        xy, x, y;
    for (var i=0, len=arc.length; i<len; i++) {
      xy = arc[i];
      x = xy[0] + prevX;
      y = xy[1] + prevY;
      xy[0] = x * mx + bx;
      xy[1] = y * my + by;
      prevX = x;
      prevY = y;
    }
  });
};

// TODO: consider removing dupes...
TopoJSON.roundCoords = function(arcs, precision) {
  var round = getRoundingFunction(precision),
      p;
  arcs.forEach(function(arc) {
    for (var i=0, len=arc.length; i<len; i++) {
      p = arc[i];
      p[0] = round(p[0]);
      p[1] = round(p[1]);
    }
  });
};

TopoJSON.importObject = function(obj, opts) {
  if (obj.type != 'GeometryCollection') {
    obj = {
      type: "GeometryCollection",
      geometries: [obj]
    };
  }
  return TopoJSON.importGeometryCollection(obj, opts);
};

TopoJSON.importGeometryCollection = function(obj, opts) {
  var importer = new TopoJSON.GeometryImporter(opts);
  obj.geometries.forEach(importer.addGeometry, importer);
  return importer.done();
};

//
//
TopoJSON.GeometryImporter = function(opts) {
  var idField = opts && opts.id_field || GeoJSON.ID_FIELD,
      properties = [],
      shapes = [], // topological ids
      collectionType = null;

  this.addGeometry = function(geom) {
    var type = GeoJSON.translateGeoJSONType(geom.type),
        shapeId = shapes.length,
        rec = geom.properties,
        shape = null;

    if ('id' in geom) {
      rec = rec || {};
      rec[idField] = geom.id;
    }
    if (rec) {
      properties[shapeId] = rec;
    }
    if (type == 'point') {
      shape = this.importPointGeometry(geom);
    } else if (geom.type in TopoJSON.pathImporters) {
      shape = TopoJSON.pathImporters[geom.type](geom.arcs);
    } else {
      if (geom.type) {
        verbose("[TopoJSON] Unknown geometry type:", geom.type);
      }
      // null geometry -- ok
    }
    shapes.push(shape);
    this.updateCollectionType(type);
  };

  this.importPointGeometry = function(geom) {
    var shape = null;
    if (geom.type == 'Point') {
      shape = [geom.coordinates];
    } else if (geom.type == 'MultiPoint') {
      shape = geom.coordinates;
    } else {
      stop("Invalid TopoJSON point geometry:", geom);
    }
    return shape;
  };

  this.updateCollectionType = function(type) {
    if (!collectionType) {
      collectionType = type;
    } else if (type && collectionType != type) {
      collectionType = 'mixed';
    }
  };

  this.done = function() {
    var lyr = {};
    if (collectionType) {
      lyr.geometry_type = collectionType;
      lyr.shapes = shapes;
    }
    if (properties.length > 0) {
      lyr.data = new DataTable(properties);
    }
    return lyr;
  };
};

TopoJSON.pathImporters = {
  LineString: function(arcs) {
    return [arcs];
  },
  MultiLineString: function(arcs) {
    return arcs;
  },
  Polygon: function(arcs) {
    return arcs;
  },
  MultiPolygon: function(arcs) {
    return arcs.reduce(function(memo, arr) {
      return memo ? memo.concat(arr) : arr;
    }, null);
  }
};




TopoJSON.getPresimplifyFunction = function(width) {
  var quanta = 10000,  // enough resolution for pixel-level detail at 1000px width and 10x zoom
      k = quanta / width;
  return function(z) {
    // could substitute a rounding function with decimal precision
    return z === Infinity ? 0 : Math.ceil(z * k);
  };
};




api.explodeFeatures = function(lyr, arcs, opts) {
  var properties = lyr.data ? lyr.data.getRecords() : null,
      explodedProperties = properties ? [] : null,
      explodedShapes = [],
      explodedLyr = utils.extend({}, lyr);

  lyr.shapes.forEach(function(shp, shpId) {
    var exploded;
    if (!shp) {
      explodedShapes.push(null);
    } else {
      if (lyr.geometry_type == 'polygon' && shp.length > 1) {
        exploded = MapShaper.explodePolygon(shp, arcs);
      } else {
        exploded = MapShaper.explodeShape(shp);
      }
      utils.merge(explodedShapes, exploded);
    }

    explodedLyr.shapes = explodedShapes;
    if (explodedProperties) {
      for (var i=0, n=exploded ? exploded.length : 1; i<n; i++) {
        explodedProperties.push(MapShaper.cloneProperties(properties[shpId]));
      }
    }
  });

  explodedLyr.shapes = explodedShapes;
  if (explodedProperties) {
    explodedLyr.data = new DataTable(explodedProperties);
  }
  return explodedLyr;
};

MapShaper.explodeShape = function(shp) {
  return shp.map(function(part) {
    return [part.concat()];
  });
};

MapShaper.explodePolygon = function(shape, arcs) {
  var paths = MapShaper.getPathMetadata(shape, arcs, "polygon");
  var groups = MapShaper.groupPolygonRings(paths);
  return groups.map(function(shape) {
    return shape.map(function(path) {
      return path.ids;
    });
  });
};

MapShaper.cloneProperties = function(obj) {
  var clone = {};
  for (var key in obj) {
    clone[key] = obj[key];
  }
  return clone;
};




MapShaper.exportTopoJSON = function(dataset, opts) {
  var topology = TopoJSON.exportTopology(dataset, opts),
      stringify = JSON.stringify,
      filename = opts.output_file || utils.getOutputFileBase(dataset) + '.json';
  if (opts.prettify) {
    stringify = MapShaper.getFormattedStringify('coordinates,arcs,bbox,translate,scale'.split(','));
  }
  return [{
    content: stringify(topology),
    filename: filename
  }];
};

// Convert a dataset object to a TopoJSON topology object
TopoJSON.exportTopology = function(src, opts) {
  var dataset = opts.cloned ? src : TopoJSON.copyDatasetForExport(src),
      arcs = dataset.arcs,
      topology = {type: "Topology"},
      bounds;

  // generate arcs and transform
  if (MapShaper.datasetHasPaths(dataset)) {
    bounds = MapShaper.getDatasetBounds(dataset);
    if (opts.bbox && bounds.hasBounds()) {
      topology.bbox = bounds.toArray();
    }
    if (opts.presimplify && !dataset.arcs.getVertexData().zz) {
      // Calculate simplification thresholds if needed
      api.simplify(dataset, opts);
    }
    if (!opts.no_quantization) {
      topology.transform = TopoJSON.transformDataset(dataset, bounds, opts);
    }
    MapShaper.dissolveArcs(dataset); // dissolve/prune arcs for more compact output
    topology.arcs = TopoJSON.exportArcs(arcs, bounds, opts);
    if (topology.transform) {
      TopoJSON.deltaEncodeArcs(topology.arcs);
    }
  } else {
    // some datasets may lack arcs; spec seems to require an array anyway
    topology.arcs = [];
  }

  // export layers as TopoJSON named objects
  topology.objects = dataset.layers.reduce(function(objects, lyr, i) {
    var name = lyr.name || "layer" + (i + 1);
    objects[name] = TopoJSON.exportLayer(lyr, arcs, opts);
    return objects;
  }, {});

  // retain crs data if relevant
  MapShaper.exportCRS(dataset, topology);
  return topology;
};

// TODO: switch to MapShaper.copyDatasetForExport(), which is similar but
// deep-copies shape data.
// Clone arc data (this gets modified in place during TopoJSON export)
// Shallow-copy shape data in each layer (gets replaced with remapped shapes)
TopoJSON.copyDatasetForExport = function(dataset) {
  var copy = {info: dataset.info};
  copy.layers = dataset.layers.map(function(lyr) {
    var shapes = lyr.shapes ? lyr.shapes.concat() : null;
    return utils.defaults({shapes: shapes}, lyr);
  });
  if (dataset.arcs) {
    copy.arcs = dataset.arcs.getFilteredCopy();
  }
  return copy;
};

TopoJSON.transformDataset = function(dataset, bounds, opts) {
  var bounds2 = TopoJSON.calcExportBounds(bounds, dataset.arcs, opts),
      fw = bounds.getTransform(bounds2),
      inv = fw.invert();

  dataset.arcs.transformPoints(function(x, y) {
    var p = fw.transform(x, y);
    return [Math.round(p[0]), Math.round(p[1])];
  });

  // TODO: think about handling geometrical errors introduced by quantization,
  // e.g. segment intersections and collapsed polygon rings.
  return {
    scale: [inv.mx, inv.my],
    translate: [inv.bx, inv.by]
  };
};

// Export arcs as arrays of [x, y] and possibly [z] coordinates
TopoJSON.exportArcs = function(arcs, bounds, opts) {
  var fromZ = null,
      output = [];
  if (opts.presimplify) {
    fromZ = TopoJSON.getPresimplifyFunction(bounds.width());
  }
  arcs.forEach2(function(i, n, xx, yy, zz) {
    var arc = [], p;
    for (var j=i + n; i<j; i++) {
      p = [xx[i], yy[i]];
      if (fromZ) {
        p.push(fromZ(zz[i]));
      }
      arc.push(p);
    }
    output.push(arc.length > 1 ? arc : null);
  });
  return output;
};

// Apply delta encoding in-place to an array of topojson arcs
TopoJSON.deltaEncodeArcs = function(arcs) {
  arcs.forEach(function(arr) {
    var ax, ay, bx, by, p;
    for (var i=0, n=arr.length; i<n; i++) {
      p = arr[i];
      bx = p[0];
      by = p[1];
      if (i > 0) {
        p[0] = bx - ax;
        p[1] = by - ay;
      }
      ax = bx;
      ay = by;
    }
  });
};

// Calculate the x, y extents that map to an integer unit in topojson output
// as a fraction of the x- and y- extents of the average segment.
TopoJSON.calcExportResolution = function(arcs, k) {
  // TODO: think about the effect of long lines, e.g. from polar cuts.
  var xy = MapShaper.getAvgSegment2(arcs);
  return [xy[0] * k, xy[1] * k];
};

// Calculate the bounding box of quantized topojson coordinates using one
// of several methods.
TopoJSON.calcExportBounds = function(bounds, arcs, opts) {
  var unitXY, xmax, ymax;
  if (opts.topojson_precision > 0) {
    unitXY = TopoJSON.calcExportResolution(arcs, opts.topojson_precision);
  } else if (opts.quantization > 0) {
    unitXY = [bounds.width() / (opts.quantization-1), bounds.height() / (opts.quantization-1)];
  } else if (opts.precision > 0) {
    unitXY = [opts.precision, opts.precision];
  } else {
    // default -- auto quantization at 0.02 of avg. segment len
    unitXY = TopoJSON.calcExportResolution(arcs, 0.02);
  }
  xmax = Math.ceil(bounds.width() / unitXY[0]);
  ymax = Math.ceil(bounds.height() / unitXY[1]);
  return new Bounds(0, 0, xmax, ymax);
};

TopoJSON.exportProperties = function(geometries, table, opts) {
  var properties = MapShaper.exportProperties(table, opts),
      ids = MapShaper.exportIds(table, opts);
  geometries.forEach(function(geom, i) {
    if (properties) {
      geom.properties = properties[i];
    }
    if (ids) {
      geom.id = ids[i];
    }
  });
};

// Export a mapshaper layer as a GeometryCollection
TopoJSON.exportLayer = function(lyr, arcs, opts) {
  var n = MapShaper.getFeatureCount(lyr),
      geometries = [];
  // initialize to null geometries
  for (var i=0; i<n; i++) {
    geometries[i] = {type: null};
  }
  if (MapShaper.layerHasGeometry(lyr)) {
    TopoJSON.exportGeometries(geometries, lyr.shapes, arcs, lyr.geometry_type);
  }
  if (lyr.data) {
    TopoJSON.exportProperties(geometries, lyr.data, opts);
  }
  return {
    type: "GeometryCollection",
    geometries: geometries
  };
};

TopoJSON.exportGeometries = function(geometries, shapes, coords, type) {
  var exporter = TopoJSON.exporters[type];
  if (exporter && shapes) {
    shapes.forEach(function(shape, i) {
      if (shape && shape.length > 0) {
        geometries[i] = exporter(shape, coords);
      }
    });
  }
};

TopoJSON.exportPolygonGeom = function(shape, coords) {
  var geom = {};
  shape = MapShaper.filterEmptyArcs(shape, coords);
  if (!shape || shape.length === 0) {
    geom.type = null;
  } else if (shape.length > 1) {
    geom.arcs = MapShaper.explodePolygon(shape, coords);
    if (geom.arcs.length == 1) {
      geom.arcs = geom.arcs[0];
      geom.type = "Polygon";
    } else {
      geom.type = "MultiPolygon";
    }
  } else {
    geom.arcs = shape;
    geom.type = "Polygon";
  }
  return geom;
};

TopoJSON.exportLineGeom = function(shape, coords) {
  var geom = {};
  shape = MapShaper.filterEmptyArcs(shape, coords);
  if (!shape || shape.length === 0) {
    geom.type = null;
  } else if (shape.length == 1) {
    geom.type = "LineString";
    geom.arcs = shape[0];
  } else {
    geom.type = "MultiLineString";
    geom.arcs = shape;
  }
  return geom;
};

TopoJSON.exporters = {
  polygon: TopoJSON.exportPolygonGeom,
  polyline: TopoJSON.exportLineGeom,
  point: GeoJSON.exportPointGeom
};





var ShpType = {
  NULL: 0,
  POINT: 1,
  POLYLINE: 3,
  POLYGON: 5,
  MULTIPOINT: 8,
  POINTZ: 11,
  POLYLINEZ: 13,
  POLYGONZ: 15,
  MULTIPOINTZ: 18,
  POINTM: 21,
  POLYLINEM: 23,
  POLYGONM: 25,
  MULIPOINTM: 28,
  MULTIPATCH: 31 // not supported
};

ShpType.isPolygonType = function(t) {
  return t == 5 || t == 15 || t == 25;
};

ShpType.isPolylineType = function(t) {
  return t == 3 || t == 13 || t == 23;
};

ShpType.isMultiPartType = function(t) {
  return ShpType.isPolygonType(t) || ShpType.isPolylineType(t);
};

ShpType.isMultiPointType = function(t) {
  return t == 8 || t == 18 || t == 28;
};

ShpType.isZType = function(t) {
  return utils.contains([11,13,15,18], t);
};

ShpType.isMType = function(t) {
  return ShpType.isZType(t) || utils.contains([21,23,25,28], t);
};

ShpType.hasBounds = function(t) {
  return ShpType.isMultiPartType(t) || ShpType.isMultiPointType(t);
};




MapShaper.translateShapefileType = function(shpType) {
  if (utils.contains([ShpType.POLYGON, ShpType.POLYGONM, ShpType.POLYGONZ], shpType)) {
    return 'polygon';
  } else if (utils.contains([ShpType.POLYLINE, ShpType.POLYLINEM, ShpType.POLYLINEZ], shpType)) {
    return 'polyline';
  } else if (utils.contains([ShpType.POINT, ShpType.POINTM, ShpType.POINTZ,
      ShpType.MULTIPOINT, ShpType.MULTIPOINTM, ShpType.MULTIPOINTZ], shpType)) {
    return 'point';
  }
  return null;
};

MapShaper.isSupportedShapefileType = function(t) {
  return utils.contains([0,1,3,5,8,11,13,15,18,21,23,25,28], t);
};

MapShaper.getShapefileType = function(type) {
  return {
    polygon: ShpType.POLYGON,
    polyline: ShpType.POLYLINE,
    point: ShpType.MULTIPOINT  // TODO: use POINT when possible
  }[type] || ShpType.NULL;
};





var NullRecord = function() {
  return {
    isNull: true,
    pointCount: 0,
    partCount: 0,
    byteLength: 12
  };
};

// Returns a constructor function for a shape record class with
//   properties and methods for reading coordinate data.
//
// Record properties
//   type, isNull, byteLength, pointCount, partCount (all types)
//
// Record methods
//   read(), readPoints() (all types)
//   readBounds(), readCoords()  (all but single point types)
//   readPartSizes() (polygon and polyline types)
//   readZBounds(), readZ() (Z types except POINTZ)
//   readMBounds(), readM(), hasM() (M and Z types, except POINT[MZ])
//
function ShpRecordClass(type) {
  var hasBounds = ShpType.hasBounds(type),
      hasParts = ShpType.isMultiPartType(type),
      hasZ = ShpType.isZType(type),
      hasM = ShpType.isMType(type),
      singlePoint = !hasBounds,
      mzRangeBytes = singlePoint ? 0 : 16,
      constructor;

  if (type === 0) {
    return NullRecord;
  }

  // @bin is a BinArray set to the first data byte of a shape record
  constructor = function ShapeRecord(bin, bytes) {
    var pos = bin.position();
    this.id = bin.bigEndian().readUint32();
    this.type = bin.littleEndian().skipBytes(4).readUint32();
    if (this.type === 0) {
      return new NullRecord();
    }
    if (bytes > 0 !== true || (this.type != type && this.type !== 0)) {
      error("Unable to read a shape -- .shp file may be corrupted");
    }
    this.byteLength = bytes; // bin.readUint32() * 2 + 8; // bytes in content section + 8 header bytes
    if (singlePoint) {
      this.pointCount = 1;
      this.partCount = 1;
    } else {
      bin.skipBytes(32); // skip bbox
      this.partCount = hasParts ? bin.readUint32() : 1;
      this.pointCount = bin.readUint32();
    }
    this._data = function() {
      return bin.position(pos);
    };
  };

  // base prototype has methods shared by all Shapefile types except NULL type
  // (Type-specific methods are mixed in below)
  var proto = {
    // return offset of [x, y] point data in the record
    _xypos: function() {
      var offs = 12; // skip header & record type
      if (!singlePoint) offs += 4; // skip point count
      if (hasBounds) offs += 32;
      if (hasParts) offs += 4 * this.partCount + 4; // skip part count & index
      return offs;
    },

    readCoords: function() {
      if (this.pointCount === 0) return null;
      var partSizes = this.readPartSizes(),
          xy = this._data().skipBytes(this._xypos());

      return partSizes.map(function(pointCount) {
        return xy.readFloat64Array(pointCount * 2);
      });
    },

    readXY: function() {
      if (this.pointCount === 0) return new Float64Array(0);
      return this._data().skipBytes(this._xypos()).readFloat64Array(this.pointCount * 2);
    },

    readPoints: function() {
      var xy = this.readXY(),
          zz = hasZ ? this.readZ() : null,
          mm = hasM && this.hasM() ? this.readM() : null,
          points = [], p;

      for (var i=0, n=xy.length / 2; i<n; i++) {
        p = [xy[i*2], xy[i*2+1]];
        if (zz) p.push(zz[i]);
        if (mm) p.push(mm[i]);
        points.push(p);
      }
      return points;
    },

    // Return an array of point counts in each part
    // Parts containing zero points are skipped (Shapefiles with zero-point
    // parts are out-of-spec but exist in the wild).
    readPartSizes: function() {
      var sizes = [];
      var partLen, startId, bin;
      if (this.pointCount === 0) {
        // no parts
      } else if (this.partCount == 1) {
        // single-part type or multi-part type with one part
        sizes.push(this.pointCount);
      } else {
        // more than one part
        startId = 0;
        bin = this._data().skipBytes(56); // skip to second entry in part index
        for (var i=0, n=this.partCount; i<n; i++) {
          partLen = (i < n - 1 ? bin.readUint32() : this.pointCount) - startId;
          if (partLen > 0) {
            sizes.push(partLen);
            startId += partLen;
          }
        }
      }
      return sizes;
    }
  };

  var singlePointProto = {
    read: function() {
      var n = 2;
      if (hasZ) n++;
      if (this.hasM()) n++;
      return this._data().skipBytes(12).readFloat64Array(n);
    },

    stream: function(sink) {
      var src = this._data().skipBytes(12);
      sink.addPoint(src.readFloat64(), src.readFloat64());
      sink.endPath();
    }
  };

  var multiCoordProto = {
    readBounds: function() {
      return this._data().skipBytes(12).readFloat64Array(4);
    },

    stream: function(sink) {
      var sizes = this.readPartSizes(),
          xy = this.readXY(),
          i = 0, j = 0, n;
      while (i < sizes.length) {
        n = sizes[i];
        while (n-- > 0) {
          sink.addPoint(xy[j++], xy[j++]);
        }
        sink.endPath();
        i++;
      }
      if (xy.length != j) error('Counting error');
    },

    read: function() {
      var parts = [],
          sizes = this.readPartSizes(),
          points = this.readPoints();
      for (var i=0, n = sizes.length - 1; i<n; i++) {
        parts.push(points.splice(0, sizes[i]));
      }
      parts.push(points);
      return parts;
    }
  };

  var mProto = {
    _mpos: function() {
      var pos = this._xypos() + this.pointCount * 16;
      if (hasZ) {
        pos += this.pointCount * 8 + mzRangeBytes;
      }
      return pos;
    },

    readMBounds: function() {
      return this.hasM() ? this._data().skipBytes(this._mpos()).readFloat64Array(2) : null;
    },

    // TODO: group into parts, like readCoords()
    readM: function() {
      return this.hasM() ? this._data().skipBytes(this._mpos() + mzRangeBytes).readFloat64Array(this.pointCount) : null;
    },

    // Test if this record contains M data
    // (according to the Shapefile spec, M data is optional in a record)
    //
    hasM: function() {
      var bytesWithoutM = this._mpos(),
          bytesWithM = bytesWithoutM + this.pointCount * 8 + mzRangeBytes;
      if (this.byteLength == bytesWithoutM) {
        return false;
      } else if (this.byteLength == bytesWithM) {
        return true;
      } else {
        error("#hasM() Counting error");
      }
    }
  };

  var zProto = {
    _zpos: function() {
      return this._xypos() + this.pointCount * 16;
    },

    readZBounds: function() {
      return this._data().skipBytes(this._zpos()).readFloat64Array(2);
    },

    // TODO: group into parts, like readCoords()
    readZ: function() {
      return this._data().skipBytes(this._zpos() + mzRangeBytes).readFloat64Array(this.pointCount);
    }
  };

  if (singlePoint) {
    utils.extend(proto, singlePointProto);
  } else {
    utils.extend(proto, multiCoordProto);
  }
  if (hasZ) utils.extend(proto, zProto);
  if (hasM) utils.extend(proto, mProto);

  constructor.prototype = proto;
  proto.constructor = constructor;
  return constructor;
}




utils.replaceFileExtension = function(path, ext) {
  var info = utils.parseLocalPath(path);
  return info.pathbase + '.' + ext;
};

utils.getPathSep = function(path) {
  // TODO: improve
  return path.indexOf('/') == -1 && path.indexOf('\\') != -1 ? '\\' : '/';
};

// Parse the path to a file without using Node
// Assumes: not a directory path
utils.parseLocalPath = function(path) {
  var obj = {},
      sep = utils.getPathSep(path),
      parts = path.split(sep),
      i;

  if (parts.length == 1) {
    obj.filename = parts[0];
    obj.directory = "";
  } else {
    obj.filename = parts.pop();
    obj.directory = parts.join(sep);
  }
  i = obj.filename.lastIndexOf('.');
  if (i > -1) {
    obj.extension = obj.filename.substr(i + 1);
    obj.basename = obj.filename.substr(0, i);
    obj.pathbase = path.substr(0, path.lastIndexOf('.'));
  } else {
    obj.extension = "";
    obj.basename = obj.filename;
    obj.pathbase = path;
  }
  return obj;
};

utils.getFileBase = function(path) {
  return utils.parseLocalPath(path).basename;
};

utils.getFileExtension = function(path) {
  return utils.parseLocalPath(path).extension;
};

utils.getPathBase = function(path) {
  return utils.parseLocalPath(path).pathbase;
};

utils.getCommonFileBase = function(names) {
  return names.reduce(function(memo, name, i) {
    if (i === 0) {
      memo = utils.getFileBase(name);
    } else {
      memo = utils.mergeNames(memo, name);
    }
    return memo;
  }, "");
};

utils.getOutputFileBase = function(dataset) {
  var inputFiles = dataset.info && dataset.info.input_files;
  return inputFiles && utils.getCommonFileBase(inputFiles) || 'output';
};




// Guess the type of a data file from file extension, or return null if not sure
MapShaper.guessInputFileType = function(file) {
  var ext = utils.getFileExtension(file || '').toLowerCase(),
      type = null;
  if (ext == 'dbf' || ext == 'shp' || ext == 'prj') {
    type = ext;
  } else if (/json$/.test(ext)) {
    type = 'json';
  }
  return type;
};

MapShaper.guessInputContentType = function(content) {
  var type = null;
  if (utils.isString(content)) {
    type = MapShaper.stringLooksLikeJSON(content) ? 'json' : 'text';
  } else if (utils.isObject(content) && content.type || utils.isArray(content)) {
    type = 'json';
  }
  return type;
};

MapShaper.guessInputType = function(file, content) {
  return MapShaper.guessInputFileType(file) || MapShaper.guessInputContentType(content);
};

//
MapShaper.stringLooksLikeJSON = function(str) {
  return /^\s*[{[]/.test(String(str));
};

MapShaper.couldBeDsvFile = function(name) {
  var ext = utils.getFileExtension(name).toLowerCase();
  return /csv|tsv|txt$/.test(ext);
};

// Infer output format by considering file name and (optional) input format
MapShaper.inferOutputFormat = function(file, inputFormat) {
  var ext = utils.getFileExtension(file).toLowerCase(),
      format = null;
  if (ext == 'shp') {
    format = 'shapefile';
  } else if (ext == 'dbf') {
    format = 'dbf';
  } else if (ext == 'svg') {
    format = 'svg';
  } else if (/json$/.test(ext)) {
    format = 'geojson';
    if (ext == 'topojson' || inputFormat == 'topojson' && ext != 'geojson') {
      format = 'topojson';
    } else if (ext == 'json' && inputFormat == 'json') {
      format = 'json'; // JSON table
    }
  } else if (MapShaper.couldBeDsvFile(file)) {
    format = 'dsv';
  } else if (inputFormat) {
    format = inputFormat;
  }
  return format;
};

MapShaper.isZipFile = function(file) {
  return /\.zip$/i.test(file);
};

MapShaper.isSupportedOutputFormat = function(fmt) {
  var types = ['geojson', 'topojson', 'json', 'dsv', 'dbf', 'shapefile', 'svg'];
  return types.indexOf(fmt) > -1;
};

MapShaper.getFormatName = function(fmt) {
  return {
    geojson: 'GeoJSON',
    topojson: 'TopoJSON',
    json: 'JSON records',
    dsv: 'CSV',
    dbf: 'DBF',
    shapefile: 'Shapefile',
    svg: 'SVG',
    echartsmapjson: 'Echarts-map-json  (encode)',
    echartsmapjs: 'Echarts-map-js  (encode)',
  }[fmt] || '';
};

// Assumes file at @path is one of Mapshaper's supported file types
MapShaper.isBinaryFile = function(path) {
  var ext = utils.getFileExtension(path).toLowerCase();
  return ext == 'shp' || ext == 'dbf' || ext == 'zip'; // GUI accepts zip files
};

// Detect extensions of some unsupported file types, for cmd line validation
MapShaper.filenameIsUnsupportedOutputType = function(file) {
  var rxp = /\.(shx|prj|xls|xlsx|gdb|sbn|sbx|xml|kml)$/i;
  return rxp.test(file);
};




var cli = {};

cli.isFile = function(path) {
  var ss = cli.statSync(path);
  return ss && ss.isFile() || false;
};

cli.fileSize = function(path) {
  var ss = cli.statSync(path);
  return ss && ss.size || 0;
};

cli.isDirectory = function(path) {
  var ss = cli.statSync(path);
  return ss && ss.isDirectory() || false;
};

// @encoding (optional) e.g. 'utf8'
cli.readFile = function(fname, encoding) {
  var lib = require(fname == '/dev/stdin' ? 'rw' : 'fs');
  var content = lib.readFileSync(fname);
  if (encoding) {
    content = MapShaper.decodeString(content, encoding);
  }
  return content;
};

// @content Buffer, ArrayBuffer or string
cli.writeFile = function(path, content) {
  if (content instanceof ArrayBuffer) {
    content = cli.convertArrayBuffer(content);
  }
  require('rw').writeFileSync(path, content);
};

// Returns Node Buffer
cli.convertArrayBuffer = function(buf) {
  var src = new Uint8Array(buf),
      dest = new Buffer(src.length);
  for (var i = 0, n=src.length; i < n; i++) {
    dest[i] = src[i];
  }
  return dest;
};

// Expand any "*" wild cards in file name
// (For the Windows command line; unix shells do this automatically)
cli.expandFileName = function(name) {
  if (name.indexOf('*') == -1) return [name];
  var path = utils.parseLocalPath(name),
      dir = path.directory || '.',
      listing = require('fs').readdirSync(dir),
      rxp = utils.wildcardToRegExp(path.filename);

  return listing.reduce(function(memo, item) {
    var path = require('path').join(dir, item);
    if (rxp.test(item) && cli.isFile(path)) {
      memo.push(path);
    }
    return memo;
  }, []);
};

// Expand any wildcards and check that files exist.
cli.validateInputFiles = function(files) {
  files = files.reduce(function(memo, name) {
    return memo.concat(cli.expandFileName(name));
  }, []);
  files.forEach(cli.checkFileExists);
  return files;
};

cli.validateOutputDir = function(name) {
  if (!cli.isDirectory(name)) {
    error("Output directory not found:", name);
  }
};

// TODO: rename and improve
// Want to test if a path is something readable (e.g. file or stdin)
cli.checkFileExists = function(path) {
  if (!cli.isFile(path) && path != '/dev/stdin') {
    stop("File not found (" + path + ")");
  }
};

cli.statSync = function(fpath) {
  var obj = null;
  try {
    obj = require('fs').statSync(fpath);
  } catch(e) {}
  return obj;
};




// Read data from a .shp file
// @src is an ArrayBuffer, Node.js Buffer or filename
//
//    // Example: iterating using #nextShape()
//    var reader = new ShpReader(buf), s;
//    while (s = reader.nextShape()) {
//      // process the raw coordinate data yourself...
//      var coords = s.readCoords(); // [[x,y,x,y,...], ...] Array of parts
//      var zdata = s.readZ();  // [z,z,...]
//      var mdata = s.readM();  // [m,m,...] or null
//      // .. or read the shape into nested arrays
//      var data = s.read();
//    }
//
//    // Example: reading records using a callback
//    var reader = new ShpReader(buf);
//    reader.forEachShape(function(s) {
//      var data = s.read();
//    });
//
function ShpReader(src) {
  if (this instanceof ShpReader === false) {
    return new ShpReader(src);
  }

  var file = utils.isString(src) ? new FileBytes(src) : new BufferBytes(src);
  var header = parseHeader(file.readBytes(100, 0));
  var fileSize = file.size();
  var RecordClass = new ShpRecordClass(header.type);
  var recordOffs, i, skippedBytes;

  reset();

  this.header = function() {
    return header;
  };

  // Callback interface: for each record in a .shp file, pass a
  //   record object to a callback function
  //
  this.forEachShape = function(callback) {
    var shape = this.nextShape();
    while (shape) {
      callback(shape);
      shape = this.nextShape();
    }
  };

  // Iterator interface for reading shape records
  this.nextShape = function() {
    var shape = readShapeAtOffset(recordOffs, i),
        offs2, skipped;
    if (!shape && recordOffs + 12 <= fileSize) {
      // Very rarely, in-the-wild .shp files may contain junk bytes between
      // records; it may be possible to scan past the junk to find the next record.
      shape = huntForNextShape(recordOffs + 4, i);
    }
    if (shape) {
      recordOffs += shape.byteLength;
      if (shape.id < i) {
        // Encountered in ne_10m_railroads.shp from natural earth v2.0.0
        message("[shp] Record " + shape.id + " appears more than once -- possible file corruption.");
        return this.nextShape();
      }
      i++;
    } else {
      if (skippedBytes > 0) {
        // Encountered in ne_10m_railroads.shp from natural earth v2.0.0
        message("[shp] Skipped " + skippedBytes + " bytes in .shp file -- possible data loss.");
      }
      file.close();
      reset();
    }
    return shape;
  };

  function reset() {
    recordOffs = 100;
    skippedBytes = 0;
    i = 1; // Shapefile id of first record
  }

  function parseHeader(bin) {
    var header = {
      signature: bin.bigEndian().readUint32(),
      byteLength: bin.skipBytes(20).readUint32() * 2,
      version: bin.littleEndian().readUint32(),
      type: bin.readUint32(),
      bounds: bin.readFloat64Array(4), // xmin, ymin, xmax, ymax
      zbounds: bin.readFloat64Array(2),
      mbounds: bin.readFloat64Array(2)
    };

    if (header.signature != 9994) {
      error("Not a valid .shp file");
    }

    if (!MapShaper.isSupportedShapefileType(header.type)) {
      error("Unsupported .shp type:", header.type);
    }

    if (header.byteLength != file.size()) {
      error("File size of .shp doesn't match size in header");
    }

    return header;
  }

  function readShapeAtOffset(recordOffs, i) {
    var shape = null,
        recordSize, recordType, recordId, goodId, goodSize, goodType, bin;

    if (recordOffs + 12 <= fileSize) {
      bin = file.readBytes(12, recordOffs);
      recordId = bin.bigEndian().readUint32();
      // record size is bytes in content section + 8 header bytes
      recordSize = bin.readUint32() * 2 + 8;
      recordType = bin.littleEndian().readUint32();
      goodId = recordId == i; // not checking id ...
      goodSize = recordOffs + recordSize <= fileSize && recordSize >= 12;
      goodType = recordType === 0 || recordType == header.type;
      if (goodSize && goodType) {
        bin = file.readBytes(recordSize, recordOffs);
        shape = new RecordClass(bin, recordSize);
      }
    }
    return shape;
  }

  // TODO: add tests
  // Try to scan past unreadable content to find next record
  function huntForNextShape(start, id) {
    var offset = start,
        shape = null,
        bin, recordId, recordType;
    while (offset + 12 <= fileSize) {
      bin = file.readBytes(12, offset);
      recordId = bin.bigEndian().readUint32();
      recordType = bin.littleEndian().skipBytes(4).readUint32();
      if (recordId == id && (recordType == header.type || recordType === 0)) {
        // we have a likely position, but may still be unparsable
        shape = readShapeAtOffset(offset, id);
        break;
      }
      offset += 4; // try next integer position
    }
    skippedBytes += shape ? offset - start : fileSize - start;
    return shape;
  }
}

ShpReader.prototype.type = function() {
  return this.header().type;
};

ShpReader.prototype.getCounts = function() {
  var counts = {
    nullCount: 0,
    partCount: 0,
    shapeCount: 0,
    pointCount: 0
  };
  this.forEachShape(function(shp) {
    if (shp.isNull) counts.nullCount++;
    counts.pointCount += shp.pointCount;
    counts.partCount += shp.partCount;
    counts.shapeCount++;
  });
  return counts;
};

// Same interface as FileBytes, for reading from a buffer instead of a file.
function BufferBytes(buf) {
  var bin = new BinArray(buf),
      bufSize = bin.size();
  this.readBytes = function(len, offset) {
    if (bufSize < offset + len) error("Out-of-range error");
    bin.position(offset);
    return bin;
  };

  this.size = function() {
    return bufSize;
  };

  this.close = function() {};
}

// Read a binary file in chunks, to support files > 1GB in Node
function FileBytes(path) {
  var DEFAULT_BUF_SIZE = 0xffffff, // 16 MB
      fs = require('fs'),
      fileSize = cli.fileSize(path),
      cacheOffs = 0,
      cache, fd;

  this.readBytes = function(len, start) {
    if (fileSize < start + len) error("Out-of-range error");
    if (!cache || start < cacheOffs || start + len > cacheOffs + cache.size()) {
      updateCache(len, start);
    }
    cache.position(start - cacheOffs);
    return cache;
  };

  this.size = function() {
    return fileSize;
  };

  this.close = function() {
    if (fd) {
      fs.closeSync(fd);
      fd = null;
      cache = null;
      cacheOffs = 0;
    }
  };

  function updateCache(len, start) {
    var headroom = fileSize - start,
        bufSize = Math.min(headroom, Math.max(DEFAULT_BUF_SIZE, len)),
        buf = new Buffer(bufSize),
        bytesRead;
    if (!fd) fd = fs.openSync(path, 'r');
    bytesRead = fs.readSync(fd, buf, 0, bufSize, start);
    if (bytesRead < bufSize) error("Error reading file");
    cacheOffs = start;
    cache = new BinArray(buf);
  }
}




// Read Shapefile data from a file, ArrayBuffer or Buffer
// @src filename or buffer
MapShaper.importShp = function(src, opts) {
  var reader = new ShpReader(src),
      shpType = reader.type(),
      type = MapShaper.translateShapefileType(shpType),
      importOpts = utils.defaults({
        type: type,
        reserved_points: Math.round(reader.header().byteLength / 16)
      }, opts),
      importer = new PathImporter(importOpts);

  if (!MapShaper.isSupportedShapefileType(shpType)) {
    stop("Unsupported Shapefile type:", shpType);
  }
  if (ShpType.isZType(shpType)) {
    message("Warning: Shapefile Z data will be lost.");
  } else if (ShpType.isMType(shpType)) {
    message("Warning: Shapefile M data will be lost.");
  }

  // TODO: test cases: null shape; non-null shape with no valid parts
  reader.forEachShape(function(shp) {
    importer.startShape();
    if (shp.isNull) {
      // skip
    } else if (type == 'point') {
      importer.importPoints(shp.readPoints());
    } else {
      shp.stream(importer);
    }
  });

  return importer.done();
};




// Convert a dataset to Shapefile files
MapShaper.exportShapefile = function(dataset, opts) {
  return dataset.layers.reduce(function(files, lyr) {
    var prj = MapShaper.exportPrjFile(lyr, dataset);
    files = files.concat(MapShaper.exportShpAndShxFiles(lyr, dataset, opts));
    files = files.concat(MapShaper.exportDbfFile(lyr, dataset, opts));
    if (prj) files.push(prj);
    return files;
  }, []);
};

MapShaper.exportPrjFile = function(lyr, dataset) {
  var outputPrj = dataset.info && dataset.info.output_prj;
  if (!outputPrj && outputPrj !== null) { // null value indicates crs is unknown
    outputPrj = dataset.info && dataset.info.input_prj;
  }
  return outputPrj ? {
    content: outputPrj,
    filename: lyr.name + '.prj'
  } : null;
};

MapShaper.exportShpAndShxFiles = function(layer, dataset, opts) {
  var geomType = layer.geometry_type;
  var shpType = MapShaper.getShapefileType(geomType);
  var fileBytes = 100;
  var bounds = new Bounds();
  var shapes = layer.shapes || utils.initializeArray(new Array(MapShaper.getFeatureCount(layer)), null);
  var shapeBuffers = shapes.map(function(shape, i) {
    var pathData = MapShaper.exportPathData(shape, dataset.arcs, geomType);
    var rec = MapShaper.exportShpRecord(pathData, i+1, shpType);
    fileBytes += rec.buffer.byteLength;
    if (rec.bounds) bounds.mergeBounds(rec.bounds);
    return rec.buffer;
  });

  // write .shp header section
  var shpBin = new BinArray(fileBytes, false)
    .writeInt32(9994)
    .skipBytes(5 * 4)
    .writeInt32(fileBytes / 2)
    .littleEndian()
    .writeInt32(1000)
    .writeInt32(shpType);

  if (bounds.hasBounds()) {
    shpBin.writeFloat64(bounds.xmin || 0) // using 0s as empty value
      .writeFloat64(bounds.ymin || 0)
      .writeFloat64(bounds.xmax || 0)
      .writeFloat64(bounds.ymax || 0);
  } else {
    // no bounds -- assume no shapes or all null shapes -- using 0s as bbox
    shpBin.skipBytes(4 * 8);
  }

  shpBin.skipBytes(4 * 8); // skip Z & M type bounding boxes;

  // write .shx header
  var shxBytes = 100 + shapeBuffers.length * 8;
  var shxBin = new BinArray(shxBytes, false)
    .writeBuffer(shpBin.buffer(), 100) // copy .shp header to .shx
    .position(24)
    .bigEndian()
    .writeInt32(shxBytes/2)
    .position(100);

  // write record sections of .shp and .shx
  shapeBuffers.forEach(function(buf, i) {
    var shpOff = shpBin.position() / 2,
        shpSize = (buf.byteLength - 8) / 2; // alternative: shxBin.writeBuffer(buf, 4, 4);
    shxBin.writeInt32(shpOff);
    shxBin.writeInt32(shpSize);
    shpBin.writeBuffer(buf);
  });

  return [{
      content: shpBin.buffer(),
      filename: layer.name + ".shp"
    }, {
      content: shxBin.buffer(),
      filename: layer.name + ".shx"
    }];
};

// Returns an ArrayBuffer containing a Shapefile record for one shape
//   and the bounding box of the shape.
// TODO: remove collapsed rings, convert to null shape if necessary
//
MapShaper.exportShpRecord = function(data, id, shpType) {
  var bounds = null,
      bin = null;
  if (data.pointCount > 0) {
    var multiPart = ShpType.isMultiPartType(shpType),
        partIndexIdx = 52,
        pointsIdx = multiPart ? partIndexIdx + 4 * data.pathCount : 48,
        recordBytes = pointsIdx + 16 * data.pointCount,
        pointCount = 0;

    bounds = data.bounds;
    bin = new BinArray(recordBytes, false)
      .writeInt32(id)
      .writeInt32((recordBytes - 8) / 2)
      .littleEndian()
      .writeInt32(shpType)
      .writeFloat64(bounds.xmin)
      .writeFloat64(bounds.ymin)
      .writeFloat64(bounds.xmax)
      .writeFloat64(bounds.ymax);

    if (multiPart) {
      bin.writeInt32(data.pathCount);
    } else {
      if (data.pathData.length > 1) {
        error("[exportShpRecord()] Tried to export multiple paths as type:", shpType);
      }
    }

    bin.writeInt32(data.pointCount);

    data.pathData.forEach(function(path, i) {
      if (multiPart) {
        bin.position(partIndexIdx + i * 4).writeInt32(pointCount);
      }
      bin.position(pointsIdx + pointCount * 16);

      var points = path.points;
      for (var j=0, len=points.length; j<len; j++) {
        bin.writeFloat64(points[j][0]);
        bin.writeFloat64(points[j][1]);
      }
      pointCount += j;
    });
    if (data.pointCount != pointCount)
      error("Shp record point count mismatch; pointCount:",
          pointCount, "data.pointCount:", data.pointCount);

  } else {
    // no data -- export null record
    bin = new BinArray(12, false)
      .writeInt32(id)
      .writeInt32(2)
      .littleEndian()
      .writeInt32(0);
  }

  return {bounds: bounds, buffer: bin.buffer()};
};




MapShaper.importDbfTable = function(buf, o) {
  var opts = o || {};
  return new ShapefileTable(buf, opts.encoding);
};

// Implements the DataTable api for DBF file data.
// We avoid touching the raw DBF field data if possible. This way, we don't need
// to parse the DBF at all in common cases, like importing a Shapefile, editing
// just the shapes and exporting in Shapefile format.
// TODO: consider accepting just the filename, so buffer doesn't consume memory needlessly.
//
function ShapefileTable(buf, encoding) {
  var reader = new DbfReader(buf, encoding),
      altered = false,
      table;

  function getTable() {
    if (!table) {
      // export DBF records on first table access
      table = new DataTable(reader.readRows());
      reader = null;
      buf = null; // null out references to DBF data for g.c.
    }
    return table;
  }

  this.exportAsDbf = function(encoding) {
    // export original dbf bytes if records haven't been touched.
    return reader && !altered ? reader.getBuffer() : getTable().exportAsDbf(encoding);
  };

  this.getRecordAt = function(i) {
    return reader ? reader.readRow(i) : table.getRecordAt(i);
  };

  this.deleteField = function(f) {
    if (table) {
      table.deleteField(f);
    } else {
      altered = true;
      reader.deleteField(f);
    }
  };

  this.getRecords = function() {
    return getTable().getRecords();
  };

  this.getFields = function() {
    return reader ? reader.getFields() : table.getFields();
  };

  this.size = function() {
    return reader ? reader.size() : table.size();
  };
}

utils.extend(ShapefileTable.prototype, dataTableProto);




MapShaper.exportDbf = function(dataset, opts) {
  return dataset.layers.reduce(function(files, lyr) {
    if (lyr.data) {
      files = files.concat(MapShaper.exportDbfFile(lyr, dataset, opts));
    }
    return files;
  }, []);
};

MapShaper.exportDbfFile = function(lyr, dataset, opts) {
  var data = lyr.data,
      buf;
  // create empty data table if missing a table or table is being cut out
  if (!data || opts.cut_table || opts.drop_table) {
    data = new DataTable(lyr.shapes.length);
  }
  // dbfs should have at least one column; add id field if none
  if (data.getFields().length === 0) {
    data.addIdField();
  }
  buf = data.exportAsDbf(opts.encoding || 'utf8');
  if (utils.isInteger(opts.ldid)) {
    new Uint8Array(buf)[29] = opts.ldid; // set language driver id
  }
  // TODO: also export .cpg page
  return [{
    content: buf,
    filename: lyr.name + '.dbf'
  }];
};







api.svgStyle = function(lyr, dataset, opts) {
  var keys = Object.keys(opts),
      svgFields = MapShaper.getStyleFields(keys, MapShaper.svgStyles, MapShaper.invalidSvgTypes[lyr.geometry_type]);

  svgFields.forEach(function(f) {
    var val = opts[f];
    var literal = null;
    var records, func;
    var type = MapShaper.svgStyleTypes[f];
    if (!lyr.data) {
      MapShaper.initDataTable(lyr);
    }
    if (type == 'number' && MapShaper.isSvgNumber(val)) {
      literal = Number(val);
    } else if (type == 'color' && MapShaper.isSvgColor(val, lyr.data.getFields())) {
      literal = val;
    } else if (type == 'classname' && MapShaper.isSvgClassName(val, lyr.data.getFields())) {
      literal = val;
    }
    if (literal === null) {
      func = MapShaper.compileValueExpression(val, lyr, dataset.arcs);
    }

    records = lyr.data.getRecords();
    records.forEach(function(rec, i) {
      rec[f] = func ? func(i) : literal;
    });
  });
};

MapShaper.isSvgClassName = function(str, fields) {
  str = str.trim();
  return (!fields || fields.indexOf(str) == -1) && /^( ?[_a-z][-_a-z0-9]*\b)+$/i.test(str);
};

MapShaper.isSvgNumber = function(o) {
  return utils.isFiniteNumber(o) || utils.isString(o) && /^-?[.0-9]+$/.test(o);
};

MapShaper.isSvgColor = function(str, fields) {
  str = str.trim();
  return (!fields || fields.indexOf(str) == -1) && /^[a-z]+$/i.test(str) ||
    /^#[0-9a-f]+$/i.test(str) || /^rgba?\([0-9,. ]+\)$/.test(str);
};

MapShaper.getStyleFields = function(fields, index, blacklist) {
  return fields.reduce(function(memo, f) {
    if (f in index) {
      if (!blacklist || blacklist.indexOf(f) == -1) {
        memo.push(f);
      }
    }
    return memo;
  }, []);
};

MapShaper.getSvgStyleFields = function(lyr) {
  var fields = lyr.data ? lyr.data.getFields() : [];
  return MapShaper.getStyleFields(fields, MapShaper.svgStyles, MapShaper.invalidSvgTypes[lyr.geometry_type]);
};

MapShaper.layerHasSvgDisplayStyle = function(lyr) {
  var fields = MapShaper.getSvgStyleFields(lyr);
  return utils.difference(fields, ['opacity', 'class']).length > 0;
};

MapShaper.invalidSvgTypes = {
  polygon: ['r'],
  polyline: ['r', 'fill']
};

MapShaper.svgStyles = {
  'class': 'class',
  opacity: 'opacity',
  r: 'radius',
  fill: 'fillColor',
  stroke: 'strokeColor',
  stroke_width: 'strokeWidth'
};

MapShaper.svgStyleTypes = {
  class: 'classname',
  opacity: 'number',
  r: 'number',
  fill: 'color',
  stroke: 'color',
  stroke_width: 'number'
};




var SVG = {};

SVG.importGeoJSONFeatures = function(features) {
  return features.map(function(obj, i) {
    var geom = obj.type == 'Feature' ? obj.geometry : obj; // could be null
    var geomType = geom && geom.type;
    var svgObj;
    if (!geomType) {
      return {tag: 'g'}; // empty element
    }
    svgObj = SVG.geojsonImporters[geomType](geom.coordinates);
    if (obj.properties) {
      SVG.applyStyleAttributes(svgObj, geomType, obj.properties);
    }
    if ('id' in obj) {
      if (!svgObj.properties) {
        svgObj.properties = {};
      }
      svgObj.properties.id = obj.id;
    }
    return svgObj;
  });
};

SVG.stringify = function(obj) {
  var svg = '<' + obj.tag;
  if (obj.properties) {
    svg += SVG.stringifyProperties(obj.properties);
  }
  if (obj.children) {
    svg += '>\n';
    svg += obj.children.map(SVG.stringify).join('\n');
    svg += '\n</' + obj.tag + '>';
  } else {
    svg += '/>';
  }
  return svg;
};

SVG.stringifyProperties = function(o) {
  return Object.keys(o).reduce(function(memo, key, i) {
    var val = o[key],
        strval = JSON.stringify(val);
    if (strval.charAt(0) != '"') {
      if (!utils.isFiniteNumber(val)) {
        // not a string or number -- skipping
        return memo;
      }
      strval = '"' + strval + '"';
    }
    return memo + ' ' + key + "=" + strval;
  }, '');
};


SVG.applyStyleAttributes = function(svgObj, geomType, rec) {
  var properties = svgObj.properties;
  var invalidStyles = MapShaper.invalidSvgTypes[GeoJSON.translateGeoJSONType(geomType)];
  var fields = MapShaper.getStyleFields(Object.keys(rec), MapShaper.svgStyles, invalidStyles);
  var k;
  for (var i=0, n=fields.length; i<n; i++) {
    k = fields[i];
    SVG.setAttribute(svgObj, k.replace('_', '-'), rec[k]);
  }
};

SVG.setAttribute = function(obj, k, v) {
  var children, child;
  if ((k == 'r' || k == 'class') && obj.children) {
    // 'r' is a geometry attribute and can't be applied to a 'g' container
    // 'class' may refer to a CSS class with a value for 'r'
    children = obj.children;
    for (var i=0; i<children.length; i++) {
      child = children[i];
      if (!child.properties) child.properties = {};
      child.properties[k] = v;
    }
  } else {
    if (!obj.properties) obj.properties = {};
    obj.properties[k] = v;
  }
};

SVG.importMultiGeometry = function(coords, importer) {
  var o = {
    tag: 'g',
    children: []
  };
  for (var i=0; i<coords.length; i++) {
    o.children.push(importer(coords[i]));
  }
  return o;
};

SVG.mapVertex = function(p) {
  return p[0] + ' ' + -p[1];
};

SVG.importLineString = function(coords) {
  var d = 'M ' + coords.map(SVG.mapVertex).join(' ');
  return {
    tag: 'path',
    properties: {d: d}
  };
};

SVG.importPoint = function(p) {
  return {
    tag: 'circle',
    properties: {
      cx: p[0],
      cy: -p[1]
    }
  };
};

SVG.importPolygon = function(coords) {
  var d, o;
  for (var i=0; i<coords.length; i++) {
    d = o ? o.properties.d + ' ' : '';
    o = SVG.importLineString(coords[i]);
    o.properties.d = d + o.properties.d + ' Z';
  }
  return o;
};

SVG.geojsonImporters = {
  Point: SVG.importPoint,
  Polygon: SVG.importPolygon,
  LineString: SVG.importLineString,
  MultiPoint: function(coords) {
    return SVG.importMultiGeometry(coords, SVG.importPoint);
  },
  MultiLineString: function(coords) {
    return SVG.importMultiGeometry(coords, SVG.importLineString);
  },
  MultiPolygon: function(coords) {
    return SVG.importMultiGeometry(coords, SVG.importPolygon);
  }
};




//
//
MapShaper.exportSVG = function(dataset, opts) {
  var template = '<?xml version="1.0"?>\n<svg xmlns="http://www.w3.org/2000/svg" ' +
    'version="1.2" baseProfile="tiny" width="%d" height="%d" viewBox="%s %s %s %s" stroke-linecap="round" stroke-linejoin="round">\n%s\n</svg>';
  var b, svg;
  if (!opts.cloned) {
    dataset = MapShaper.copyDataset(dataset); // Modify a copy of the dataset
  }
  b = MapShaper.transformCoordsForSVG(dataset, opts);
  svg = dataset.layers.map(function(lyr) {
    return MapShaper.exportLayerAsSVG(lyr, dataset, opts);
  }).join('\n');
  svg = utils.format(template, b.width(), b.height(), 0, 0, b.width(), b.height(), svg);
  return [{
    content: svg,
    filename: opts.output_file || utils.getOutputFileBase(dataset) + '.svg'
  }];
};

MapShaper.transformCoordsForSVG = function(dataset, opts) {
  var width = opts.width > 0 ? opts.width : 800;
  var margin = opts.margin >= 0 ? opts.margin : 1;
  var bounds = MapShaper.getDatasetBounds(dataset);
  var precision = opts.precision || 0.0001;
  var height, bounds2, fwd;


  if (opts.svg_scale > 0) {
    // alternative to using a fixed width (e.g. when generating multiple files
    // at a consistent geographic scale)
    width = bounds.width() / opts.svg_scale;
    margin = 0;
  }
  MapShaper.padViewportBoundsForSVG(bounds, width, margin);
  height = Math.ceil(width * bounds.height() / bounds.width());
  bounds2 = new Bounds(0, -height, width, 0);
  fwd = bounds.getTransform(bounds2);
  MapShaper.transformPoints(dataset, function(x, y) {
    return fwd.transform(x, y);
  });

  MapShaper.setCoordinatePrecision(dataset, precision);
  return bounds2;
};

// pad bounds to accomodate stroke width and circle radius
MapShaper.padViewportBoundsForSVG = function(bounds, width, marginPx) {
  var bw = bounds.width() || bounds.height() || 1; // handle 0 width bbox
  var marg;
  if (marginPx >= 0 === false) {
    marginPx = 1;
  }
  marg = bw / (width - marginPx * 2) * marginPx;
  bounds.padBounds(marg, marg, marg, marg);
};

MapShaper.exportLayerAsSVG = function(lyr, dataset, opts) {
  // TODO: convert geojson features one at a time
  var geojson = MapShaper.exportGeoJSONCollection(lyr, dataset, opts);
  var features = geojson.features || geojson.geometries || (geojson.type ? [geojson] : []);
  var symbols = SVG.importGeoJSONFeatures(features);
  var layerObj = {
    tag: 'g',
    children: symbols,
    properties: {id: lyr.name}
  };

  // add default display properties to line layers
  // (these are overridden by feature-level styles set via -svg-style)
  if (lyr.geometry_type == 'polyline') {
    layerObj.properties.fill = 'none';
    layerObj.properties.stroke = 'black';
    layerObj.properties['stroke-width'] = 1;
  }

  return SVG.stringify(layerObj);
};




MapShaper.roundPoints = function(lyr, round) {
  MapShaper.forEachPoint(lyr.shapes, function(p) {
    p[0] = round(p[0]);
    p[1] = round(p[1]);
  });
};

MapShaper.setCoordinatePrecision = function(dataset, precision) {
  var round = geom.getRoundingFunction(precision);
  var dissolvePolygon, nodes;
  MapShaper.transformPoints(dataset, function(x, y) {
    return [round(x), round(y)];
  });
  if (dataset.arcs) {
    nodes = MapShaper.divideArcs(dataset);
    dissolvePolygon = MapShaper.getPolygonDissolver(nodes);
  }
  dataset.layers.forEach(function(lyr) {
    if (lyr.geometry_type == 'polygon' && dissolvePolygon) {
      // clean each polygon -- use dissolve function to remove spikes
      // TODO: better handling of corrupted polygons
      lyr.shapes = lyr.shapes.map(dissolvePolygon);
    }
  });
  return dataset;
};




// Generate output content from a dataset object
MapShaper.exportDelim = function(dataset, opts) {
  var delim = MapShaper.getExportDelimiter(dataset.info, opts),
      ext = MapShaper.getDelimFileExtension(delim, opts);
  return dataset.layers.reduce(function(arr, lyr) {
    if (lyr.data){
      arr.push({
        // TODO: consider supporting encoding= option
        content: MapShaper.exportDelimTable(lyr, delim),
        filename: (lyr.name || 'output') + '.' + ext
      });
    }
    return arr;
  }, []);
};

MapShaper.exportDelimTable = function(lyr, delim) {
  var dsv = require("d3-dsv").dsvFormat(delim);
  return dsv.format(lyr.data.getRecords());
};

MapShaper.getExportDelimiter = function(info, opts) {
  var delim = ','; // default
  var outputExt = opts.output_file ? utils.getFileExtension(opts.output_file) : '';
  if (opts.delimiter) {
    delim = opts.delimiter;
  } else if (outputExt == 'tsv') {
    delim = '\t';
  } else if (outputExt == 'csv') {
    delim = ',';
  } else if (info.input_delimiter) {
    delim = info.input_delimiter;
  }
  return delim;
};

// If output filename is not specified, use the delimiter char to pick
// an extension.
MapShaper.getDelimFileExtension = function(delim, opts) {
  var ext = 'txt'; // default
  if (opts.output_file) {
    ext = utils.getFileExtension(opts.output_file);
  } else if (delim == '\t') {
    ext = 'tsv';
  } else if (delim == ',') {
    ext = 'csv';
  }
  return ext;
};




MapShaper.importJSONTable = function(arr) {
  return {
    layers: [{
      data: new DataTable(arr)
    }],
    info: {}
  };
};

MapShaper.exportJSON = function(dataset, opts) {
  return dataset.layers.reduce(function(arr, lyr) {
    if (lyr.data){
      arr.push({
        content: MapShaper.exportJSONTable(lyr),
        filename: (lyr.name || 'output') + '.json'
      });
    }
    return arr;
  }, []);
};

MapShaper.exportJSONTable = function(lyr) {
  return JSON.stringify(lyr.data.getRecords());
};




// Return an array of objects with "filename" "filebase" "extension" and
// "content" attributes.
//
MapShaper.exportFileContent = function(dataset, opts) {
  var outFmt = opts.format = MapShaper.getOutputFormat(dataset, opts),
      exporter = MapShaper.exporters[outFmt],
      files = [];

  if (!outFmt) {
    error("[o] Missing output format");
  } else if (!exporter) {
    error("[o] Unknown export format:", outFmt);
  }

  // shallow-copy dataset and layers, so layers can be renamed for export
  dataset = utils.defaults({
    layers: dataset.layers.map(function(lyr) {return utils.extend({}, lyr);})
  }, dataset);

  if (opts.output_file && outFmt != 'topojson') {
    dataset.layers.forEach(function(lyr) {
      lyr.name = utils.getFileBase(opts.output_file);
    });
  }

  if (opts.precision && outFmt != 'svg') {
    dataset = MapShaper.copyDatasetForExport(dataset);
    MapShaper.setCoordinatePrecision(dataset, opts.precision);
  }

  MapShaper.validateLayerData(dataset.layers);
  MapShaper.assignUniqueLayerNames(dataset.layers);

  if (opts.cut_table) {
    files = MapShaper.exportDataTables(dataset.layers, opts).concat(files);
  }

  files = exporter(dataset, opts).concat(files);
  // If rounding or quantization are applied during export, bounds may
  // change somewhat... consider adding a bounds property to each layer during
  // export when appropriate.
  if (opts.bbox_index) {
    files.push(MapShaper.createIndexFile(dataset));
  }

  MapShaper.validateFileNames(files);
  return files;
};

MapShaper.exporters = {
  geojson: MapShaper.exportGeoJSON,
  topojson: MapShaper.exportTopoJSON,
  shapefile: MapShaper.exportShapefile,
  dsv: MapShaper.exportDelim,
  dbf: MapShaper.exportDbf,
  json: MapShaper.exportJSON,
  svg: MapShaper.exportSVG
};

MapShaper.getOutputFormat = function(dataset, opts) {
  var outFile = opts.output_file || null,
      inFmt = dataset.info && dataset.info.input_format,
      outFmt = null;

  if (opts.format) {
    outFmt = opts.format;
  } else if (outFile) {
    outFmt = MapShaper.inferOutputFormat(outFile, inFmt);
  } else if (inFmt) {
    outFmt = inFmt;
  }
  return outFmt;
};

// Generate json file with bounding boxes and names of each export layer
// TODO: consider making this a command, or at least make format settable
//
MapShaper.createIndexFile = function(dataset) {
  var index = dataset.layers.map(function(lyr) {
    var bounds = MapShaper.getLayerBounds(lyr, dataset.arcs);
    return {
      bbox: bounds.toArray(),
      name: lyr.name
    };
  });

  return {
    content: JSON.stringify(index),
    filename: "bbox-index.json"
  };
};

MapShaper.validateLayerData = function(layers) {
  layers.forEach(function(lyr) {
    if (!lyr.geometry_type) {
      // allowing data-only layers
      if (lyr.shapes && utils.some(lyr.shapes, function(o) {
        return !!o;
      })) {
        error("[export] A layer contains shape records and a null geometry type");
      }
    } else {
      if (!utils.contains(['polygon', 'polyline', 'point'], lyr.geometry_type)) {
        error ("[export] A layer has an invalid geometry type:", lyr.geometry_type);
      }
      if (!lyr.shapes) {
        error ("[export] A layer is missing shape data");
      }
    }
  });
};

MapShaper.validateFileNames = function(files) {
  var index = {};
  files.forEach(function(file, i) {
    var filename = file.filename;
    if (!filename) error("[o] Missing a filename for file" + i);
    if (filename in index) error("[o] Duplicate filename", filename);
    index[filename] = true;
  });
};

MapShaper.assignUniqueLayerNames = function(layers) {
  var names = layers.map(function(lyr) {
    return lyr.name || "layer";
  });
  var uniqueNames = MapShaper.uniqifyNames(names);
  layers.forEach(function(lyr, i) {
    lyr.name = uniqueNames[i];
  });
};

// Assign unique layer names across multiple datasets
MapShaper.assignUniqueLayerNames2 = function(datasets) {
  var layers = datasets.reduce(function(memo, dataset) {
    return memo.concat(dataset.layers);
  }, []);
  MapShaper.assignUniqueLayerNames(layers);
};

MapShaper.assignUniqueFileNames = function(output) {
  var names = output.map(function(o) {return o.filename;});
  var uniqnames = MapShaper.uniqifyNames(names, MapShaper.formatVersionedFileName);
  output.forEach(function(o, i) {o.filename = uniqnames[i];});
};

/*
MapShaper.getDefaultFileExtension = function(fileType) {
  var ext = "";
  if (fileType == 'shapefile') {
    ext = 'shp';
  } else if (fileType == 'geojson' || fileType == 'topojson') {
    ext = "json";
  }
  return ext;
};
*/

MapShaper.exportDataTables = function(layers, opts) {
  var tables = [];
  layers.forEach(function(lyr) {
    if (lyr.data) {
      tables.push({
        content: lyr.data.exportAsJSON(), // TODO: other formats
        filename: (lyr.name ? lyr.name + '-' : '') + 'table.json'
      });
    }
  });
  return tables;
};

MapShaper.formatVersionedName = function(name, i) {
  var suffix = String(i);
  if (/[0-9]$/.test(name)) {
    suffix = '-' + suffix;
  }
  return name + suffix;
};

MapShaper.formatVersionedFileName = function(filename, i) {
  var parts = filename.split('.');
  var ext, base;
  if (parts.length < 2) {
    return MapShaper.formatVersionedName(filename, i);
  }
  ext = parts.pop();
  base = parts.join('.');
  return MapShaper.formatVersionedName(base, i) + '.' + ext;
};

MapShaper.uniqifyNames = function(names, formatter) {
  var counts = utils.countValues(names),
      format = formatter || MapShaper.formatVersionedName,
      blacklist = {};

  Object.keys(counts).forEach(function(name) {
    if (counts[name] > 1) blacklist[name] = true; // uniqify all instances of a name
  });
  return names.map(function(name) {
    var i = 1, // first version id
        candidate = name,
        versionedName;
    while (candidate in blacklist) {
      versionedName = format(name, i);
      if (!versionedName || versionedName == candidate) {
        throw new Error("Naming error"); // catch buggy versioning function
      }
      candidate = versionedName;
      i++;
    }
    blacklist[candidate] = true;
    return candidate;
  });
};




api.evaluateEachFeature = function(lyr, arcs, exp, opts) {
  var n = MapShaper.getFeatureCount(lyr),
      compiled, filter;

  // TODO: consider not creating a data table -- not needed if expression only references geometry
  if (n > 0 && !lyr.data) {
    lyr.data = new DataTable(n);
  }
  if (opts && opts.where) {
    filter = MapShaper.compileValueExpression(opts.where, lyr, arcs);
  }
  compiled = MapShaper.compileFeatureExpression(exp, lyr, arcs);
  // call compiled expression with id of each record
  for (var i=0; i<n; i++) {
    if (!filter || filter(i)) {
      compiled(i);
    }
  }
};




// Calculate an expression across a group of features, print and return the result
// Supported functions include sum(), average(), max(), min(), median(), count()
// Functions receive a field name or a feature expression (like the -each command)
// Examples: 'sum("$.area")' 'min(income)'
// opts.expression  Expression to evaluate
// opts.where  Optional filter expression (like -filter command)
//
api.calc = function(lyr, arcs, opts) {
  var msg = 'calc ' + opts.expression,
      result;
  if (opts.where) {
    // TODO: implement no_replace option for filter() instead of this
    lyr = {
      shapes: lyr.shapes,
      data: lyr.data
    };
    api.filterFeatures(lyr, arcs, {expression: opts.where});
    msg += ' where ' + opts.where;
  }
  result = MapShaper.evalCalcExpression(lyr, arcs, opts.expression);
  message(msg + ":  " + result);
  return result;
};

MapShaper.evalCalcExpression = function(lyr, arcs, exp) {
  var calc = MapShaper.compileCalcExpression(exp);
  return calc(lyr, arcs);
};

// Return a function to evaluate a calc expression
// (also used by mapshaper-subdivide.js)
MapShaper.compileCalcExpression = function(exp) {
  return function(lyr, arcs) {
    var env = MapShaper.getCalcExpressionContext(lyr, arcs),
        calc, retn;
    try {
      calc = new Function("env", "with(env){return " + exp + ";}");
      retn = calc.call(null, env);
    } catch(e) {
      message('Error ' + (calc ? 'compiling' : 'running') + ' expression: "' + exp + '"');
      stop(e);
    }
    return retn;
  };
};

MapShaper.getCalcExpressionContext = function(lyr, arcs) {
  var env = MapShaper.getBaseContext();
  if (lyr.data) {
    lyr.data.getFields().forEach(function(f) {
      env[f] = f;
    });
  }
  MapShaper.initCalcFunctions(env, lyr, arcs);
  return env;
};

MapShaper.initCalcFunctions = function(env, lyr, arcs) {
  var functions = Object.keys(new FeatureCalculator().functions);
  functions.forEach(function(fname) {
    env[fname] = MapShaper.getCalcFunction(fname, lyr, arcs);
  });
};

MapShaper.getCalcFunction = function(fname, lyr, arcs) {
  return function(exp) {
    var calculator = new FeatureCalculator();
    var func = calculator.functions[fname];
    var compiled = MapShaper.compileValueExpression(exp, lyr, arcs);
    utils.repeat(MapShaper.getFeatureCount(lyr), function(i) {
      func(compiled(i));
    });
    return calculator.done()[fname];
  };
};

function FeatureCalculator() {
  var api = {},
      count = 0,
      sum = 0,
      sumFlag = false,
      avgSum = 0,
      avgCount = 0,
      min = Infinity,
      max = -Infinity,
      medianArr = [];

  api.sum = function(val) {
    sum += val;
    sumFlag = true;
  };

  api.count = function() {
    count++;
  };

  api.average = function(val) {
    avgCount++;
    avgSum += val;
  };

  api.median = function(val) {
    medianArr.push(val);
  };

  api.max = function(val) {
    if (val > max) max = val;
  };

  api.min = function(val) {
    if (val < min) min = val;
  };

  function done() {
    var results = {};
    if (sumFlag) results.sum = sum;
    if (avgCount > 0) results.average = avgSum / avgCount;
    if (medianArr.length > 0) results.median = utils.findMedian(medianArr);
    if (min < Infinity) results.min = min;
    if (max > -Infinity) results.max = max;
    if (count > 0) results.count = count;
    return results;
  }

  return {
    done: done,
    functions: api
  };
}




// Parse content of one or more input files and return a dataset
// @obj: file data, indexed by file type
// File data objects have two properties:
//    content: Buffer, ArrayBuffer, String or Object
//    filename: String or null
//
MapShaper.importContent = function(obj, opts) {
  var dataset, content, fileFmt, data;
  opts = opts || {};
  if (obj.json) {
    data = obj.json;
    content = data.content;
    if (utils.isString(content)) {
      try {
        content = JSON.parse(content);
      } catch(e) {
        stop("Unable to parse JSON");
      }
    }
    if (content.type == 'Topology') {
      fileFmt = 'topojson';
      dataset = MapShaper.importTopoJSON(content, opts);
    } else if (content.type) {
      fileFmt = 'geojson';
      dataset = MapShaper.importGeoJSON(content, opts);
    } else if (utils.isArray(content)) {
      fileFmt = 'json';
      dataset = MapShaper.importJSONTable(content, opts);
    }
  } else if (obj.text) {
    fileFmt = 'dsv';
    data = obj.text;
    dataset = MapShaper.importDelim(data.content, opts);
  } else if (obj.shp) {
    fileFmt = 'shapefile';
    data = obj.shp;
    dataset = MapShaper.importShapefile(obj, opts);
  } else if (obj.dbf) {
    fileFmt = 'dbf';
    data = obj.dbf;
    dataset = MapShaper.importDbf(obj, opts);
  }

  if (!dataset) {
    stop("Missing an expected input type");
  }

  // Convert to topological format, if needed
  if (dataset.arcs && !opts.no_topology && fileFmt != 'topojson') {
    T.start();
    api.buildTopology(dataset);
    T.stop("Process topology");
  }

  // Use file basename for layer name, except TopoJSON, which uses object names
  if (fileFmt != 'topojson') {
    MapShaper.setLayerName(dataset.layers[0], MapShaper.filenameToLayerName(data.filename || ''));
  }

  // Add input filename and format to the dataset's 'info' object
  // (this is useful when exporting if format or name has not been specified.)
  if (data.filename) {
    dataset.info.input_files = [data.filename];
  }
  dataset.info.input_format = fileFmt;

  return dataset;
};

// Deprecated (included for compatibility with older tests)
MapShaper.importFileContent = function(content, filename, opts) {
  var type = MapShaper.guessInputType(filename, content),
      input = {};
  input[type] = {filename: filename, content: content};
  return MapShaper.importContent(input, opts);
};

MapShaper.importShapefile = function(obj, opts) {
  var shpSrc = obj.shp.content || obj.shp.filename, // content may be missing
      dataset = MapShaper.importShp(shpSrc, opts),
      lyr = dataset.layers[0],
      dbf;
  if (obj.dbf) {
    dbf = MapShaper.importDbf(obj, opts);
    utils.extend(dataset.info, dbf.info);
    lyr.data = dbf.layers[0].data;
    if (lyr.shapes && lyr.data.size() != lyr.shapes.length) {
      message("[shp] Mismatched .dbf and .shp record count -- possible data loss.");
    }
  }
  if (obj.prj) {
    dataset.info.input_prj = obj.prj.content;
  }
  return dataset;
};

MapShaper.importDbf = function(input, opts) {
  var table;
  opts = utils.extend({}, opts);
  if (input.cpg && !opts.encoding) {
    opts.encoding = input.cpg.content;
  }
  table = MapShaper.importDbfTable(input.dbf.content, opts);
  return {
    info: {},
    layers: [{data: table}]
  };
};

MapShaper.filenameToLayerName = function(path) {
  var name = 'layer1';
  var obj = utils.parseLocalPath(path);
  if (obj.basename && obj.extension) { // exclude paths like '/dev/stdin'
    name = obj.basename;
  }
  return name;
};

// initialize layer name using filename
MapShaper.setLayerName = function(lyr, path) {
  if (!lyr.name) {
    lyr.name = utils.getFileBase(path);
  }
};




api.importFiles = function(opts) {
  var files = opts.files ? cli.validateInputFiles(opts.files) : [],
      dataset;
  if ((opts.merge_files || opts.combine_files) && files.length > 1) {
    dataset = api.mergeFiles(files, opts);
  } else if (files.length == 1) {
    dataset = api.importFile(files[0], opts);
  } else if (opts.stdin) {
    dataset = api.importFile('/dev/stdin', opts);
  } else {
    stop('Missing input file(s)');
  }
  return dataset;
};

api.importFile = function(path, opts) {
  cli.checkFileExists(path);
  var isBinary = MapShaper.isBinaryFile(path),
      isShp = MapShaper.guessInputFileType(path) == 'shp',
      input = {},
      type, content;

  if (isShp) {
    content = null; // let ShpReader read the file (supports larger files)
  } else if (isBinary) {
    content = cli.readFile(path);
  } else {
    content = cli.readFile(path, opts && opts.encoding || 'utf-8');
  }
  type = MapShaper.guessInputFileType(path) || MapShaper.guessInputContentType(content);
  if (!type) {
    error("Unkown file type:", path);
  } else if (type == 'json') {
    // parsing JSON here so input file can be gc'd before JSON data is imported
    // TODO: look into incrementally parsing JSON data
    try {
      content = JSON.parse(content);
    } catch(e) {
      stop("Unable to parse JSON");
    }
  }
  input[type] = {filename: path, content: content};
  content = null; // for g.c.
  if (type == 'shp' || type == 'dbf') {
    MapShaper.readShapefileAuxFiles(path, input);
  }
  if (type == 'shp' && !input.dbf) {
    message(utils.format("[%s] .dbf file is missing - shapes imported without attribute data.", path));
  }
  return MapShaper.importContent(input, opts);
};

api.importDataTable = function(path, opts) {
  // TODO: avoid the overhead of importing shape data, if present
  var dataset = api.importFile(path, opts);
  return dataset.layers[0].data;
};

MapShaper.readShapefileAuxFiles = function(path, obj) {
  var dbfPath = utils.replaceFileExtension(path, 'dbf');
  var cpgPath = utils.replaceFileExtension(path, 'cpg');
  var prjPath = utils.replaceFileExtension(path, 'prj');
  if (cli.isFile(prjPath)) {
    obj.prj = {filename: prjPath, content: cli.readFile(prjPath, 'utf-8')};
  }
  if (!obj.dbf && cli.isFile(dbfPath)) {
    obj.dbf = {filename: dbfPath, content: cli.readFile(dbfPath)};
  }
  if (obj.dbf && cli.isFile(cpgPath)) {
    obj.cpg = {filename: cpgPath, content: cli.readFile(cpgPath, 'utf-8').trim()};
  }
};




// TODO: remove?
api.exportFiles = function(dataset, opts) {
  MapShaper.writeFiles(MapShaper.exportFileContent(dataset, opts), opts);
};

MapShaper.writeFiles = function(exports, opts, cb) {
  if (exports.length > 0 === false) {
    message("No files to save");
  } else if (opts.dry_run) {
    // no output
  } else if (opts.stdout) {
    cli.writeFile('/dev/stdout', exports[0].content);
  } else {
    var paths = MapShaper.getOutputPaths(utils.pluck(exports, 'filename'), opts);
    exports.forEach(function(obj, i) {
      var path = paths[i];
      cli.writeFile(path, obj.content);
      message("Wrote " + path);
    });
  }
  if (cb) cb(null);
};

MapShaper.getOutputPaths = function(files, opts) {
  var odir = opts.output_dir;
  if (odir) {
    files = files.map(function(file) {
      return require('path').join(odir, file);
    });
  }
  if (!opts.force) {
    files = resolveFileCollisions(files);
  }
  return files;
};

// Avoid naming conflicts with existing files
// by adding file suffixes to output filenames: -ms, -ms2, -ms3 etc.
function resolveFileCollisions(candidates) {
  var i = 0,
      suffix = "",
      paths = candidates.concat();

  while (testFileCollision(paths)) {
    i++;
    suffix = "-ms";
    if (i > 1) suffix += String(i);
    paths = addFileSuffix(candidates, suffix);
  }
  return paths;
}

function addFileSuffix(paths, suff) {
  return paths.map(function(path) {
     return utils.getPathBase(path) + suff + '.' + utils.getFileExtension(path);
  });
}

function testFileCollision(paths) {
  return utils.some(paths, function(path) {
    return cli.isFile(path) || cli.isDirectory(path);
  });
}




api.filterFields = function(lyr, names) {
  var table = lyr.data;
  MapShaper.requireDataFields(table, names, 'filter-fields');
  utils.difference(table.getFields(), names).forEach(table.deleteField, table);
};

api.renameFields = function(lyr, names) {
  var map = MapShaper.mapFieldNames(names);
  MapShaper.requireDataFields(lyr.data, Object.keys(map), 'rename-fields');
  utils.defaults(map, MapShaper.mapFieldNames(lyr.data.getFields()));
  lyr.data.update(MapShaper.getRecordMapper(map));
};

MapShaper.mapFieldNames = function(names) {
  return names.reduce(function(memo, str) {
    var parts = str.split('=');
    var dest = parts[0],
        src = parts[1] || dest;
    if (!src || !dest) stop("[rename-fields] Invalid field description:", str);
    memo[src] = dest;
    return memo;
  }, {});
};

MapShaper.getRecordMapper = function(map) {
  var fields = Object.keys(map);
  return function(src) {
    var dest = {}, key;
    for (var i=0, n=fields.length; i<n; i++) {
      key = fields[i];
      dest[map[key]] = src[key];
    }
    return dest;
  };
};




api.printInfo = function(dataset, opts) {
  // str += utils.format("Number of layers: %d\n", dataset.layers.length);
  // if (dataset.arcs) str += utils.format("Topological arcs: %'d\n", dataset.arcs.size());
  var str = dataset.layers.map(function(lyr, i) {
    var infoStr = MapShaper.getLayerInfo(lyr, dataset.arcs);
    if (dataset.layers.length > 1) {
      infoStr = 'Layer ' + (i + 1) + '\n' + infoStr;
    }
    return infoStr;
  }).join('\n\n');
  message(str);
};

// TODO: consider polygons with zero area or other invalid geometries
MapShaper.countNullShapes = function(shapes) {
  var count = 0;
  for (var i=0; i<shapes.length; i++) {
    if (!shapes[i] || shapes[i].length === 0) count++;
  }
  return count;
};

MapShaper.getGeometryInfo = function(lyr, id) {
  var type = lyr.geometry_type || "[none]";
  if (utils.isInteger(id) && lyr.shapes && !lyr.shapes[id]) {
    type = '[null]';
  }
  return "Geometry: " + type + "\n";
};

MapShaper.getLayerInfo = function(lyr, arcs) {
  var shapeCount = lyr.shapes ? lyr.shapes.length : 0,
      nullCount = shapeCount > 0 ? MapShaper.countNullShapes(lyr.shapes) : 0,
      str;
  str = "Layer name: " + (lyr.name || "[unnamed]") + "\n";
  str += utils.format("Records: %,d\n", MapShaper.getFeatureCount(lyr));
  str += MapShaper.getGeometryInfo(lyr);
  if (nullCount > 0) {
    str += utils.format("Null shapes: %'d\n", nullCount);
  }
  if (shapeCount > nullCount) {
    str += "Bounds: " + MapShaper.getLayerBounds(lyr, arcs).toArray().join(' ') + "\n";
  }
  str += MapShaper.getTableInfo(lyr);
  return str;
};

MapShaper.getTableInfo = function(lyr, i) {
  if (!lyr.data || lyr.data.size() === 0) {
    return "Attribute data: [none]";
  }
  return MapShaper.getAttributeInfo(lyr.data, i);
};

MapShaper.getAttributeInfo = function(data, i) {
  var featureId = i || 0;
  var featureLabel = i >= 0 ? 'Value' : 'First value';
  var fields = data.getFields().sort();
  var replacements = {
    '\n': '\\n',
    '\r': '\\r',
    '\t': '\\t'
  };
  var cleanChar = function(c) {
    // convert newlines and carriage returns
    // TODO: better handling of non-printing chars
    return c in replacements ? replacements[c] : '';
  };
  var col1Chars = fields.reduce(function(memo, name) {
    return Math.max(memo, name.length);
  }, 5) + 2;
  var vals = fields.map(function(fname) {
    return data.getRecordAt(featureId)[fname];
  });
  var digits = vals.map(function(val, i) {
    return utils.isNumber(vals[i]) ? (val + '.').indexOf('.') + 1 :  0;
  });
  var maxDigits = Math.max.apply(null, digits);
  var table = vals.map(function(val, i) {
    var str = '  ' + utils.rpad(fields[i], col1Chars, ' ');
    if (utils.isNumber(val)) {
      str += utils.lpad("", maxDigits - digits[i], ' ') + val;
    } else if (utils.isString(val)) {
      val = val.replace(/[\r\t\n]/g, cleanChar);
      str += "'" + val + "'";
    } else {
      str += String(val);
    }
    return str;
  }).join('\n');
  return "Attribute data\n  " +
      utils.rpad('Field', col1Chars, ' ') + featureLabel + "\n" + table;
};

MapShaper.getSimplificationInfo = function(arcs) {
  var nodeCount = new NodeCollection(arcs).size();
  // get count of non-node vertices
  var internalVertexCount = MapShaper.countInteriorVertices(arcs);
};

MapShaper.countInteriorVertices = function(arcs) {
  var count = 0;
  arcs.forEach2(function(i, n) {
    if (n > 2) {
      count += n - 2;
    }
  });
  return count;
};




api.innerlines = function(lyr, arcs, opts) {
  MapShaper.requirePolygonLayer(lyr, "[innerlines] Command requires a polygon layer");
  var classifier = MapShaper.getArcClassifier(lyr.shapes, arcs);
  var lines = MapShaper.extractInnerLines(lyr.shapes, classifier);
  var outputLyr = MapShaper.createLineLayer(lines, null);

  if (lines.length === 0) {
    message("[innerlines] No shared boundaries were found");
  }
  outputLyr.name = opts && opts.no_replace ? null : lyr.name;
  return outputLyr;
};

api.lines = function(lyr, arcs, opts) {
  opts = opts || {};
  var classifier = MapShaper.getArcClassifier(lyr.shapes, arcs),
      fields = utils.isArray(opts.fields) ? opts.fields : [],
      typeId = 0,
      shapes = [],
      records = [],
      outputLyr;

  MapShaper.requirePolygonLayer(lyr, "[lines] Command requires a polygon layer");
  if (fields.length > 0 && !lyr.data) {
    stop("[lines] Missing a data table");
  }

  addLines(MapShaper.extractOuterLines(lyr.shapes, classifier));

  fields.forEach(function(field) {
    var data = lyr.data.getRecords();
    var key = function(a, b) {
      var arec = data[a];
      var brec = data[b];
      var aval, bval;
      if (!arec || !brec || arec[field] === brec[field]) {
        return '';
      }
      return a + '-' + b;
    };
    if (!lyr.data.fieldExists(field)) {
      stop("[lines] Unknown data field:", field);
    }
    addLines(MapShaper.extractLines(lyr.shapes, classifier(key)));
  });

  addLines(MapShaper.extractInnerLines(lyr.shapes, classifier));
  outputLyr = MapShaper.createLineLayer(shapes, records);
  outputLyr.name = opts.no_replace ? null : lyr.name;
  return outputLyr;

  function addLines(lines) {
    var attr = lines.map(function(shp, i) {
      return {TYPE: typeId};
    });
    shapes = utils.merge(lines, shapes);
    records = utils.merge(attr, records);
    typeId++;
  }
};

MapShaper.createLineLayer = function(lines, records) {
  return {
    geometry_type: 'polyline',
    shapes: lines,
    data: records ? new DataTable(records) : null
  };
};

MapShaper.extractOuterLines = function(shapes, classifier) {
  var key = function(a, b) {return b == -1 ? String(a) : '';};
  return MapShaper.extractLines(shapes, classifier(key));
};

MapShaper.extractInnerLines = function(shapes, classifier) {
  var key = function(a, b) {return b > -1 ? a + '-' + b : '';};
  return MapShaper.extractLines(shapes, classifier(key));
};

MapShaper.extractLines = function(shapes, classify) {
  var lines = [],
      index = {},
      prev = null,
      prevKey = '',
      part;

  MapShaper.traversePaths(shapes, onArc, onPart);

  function onArc(o) {
    var arcId = o.arcId,
        key = classify(absArcId(arcId)),
        isContinuation, line;
    if (!!key) {
      line = key in index ? index[key] : null;
      isContinuation = key == prevKey && o.shapeId == prev.shapeId && o.partId == prev.partId;
      if (!line) {
        line = [[arcId]]; // new shape
        index[key] = line;
        lines.push(line);
      } else if (isContinuation) {
        line[line.length-1].push(arcId); // extending prev part
      } else {
        line.push([arcId]); // new part
      }

      // if extracted line is split across endpoint of original polygon ring, then merge
      if (o.i == part.arcs.length - 1 &&  // this is last arc in ring
          line.length > 1 &&              // extracted line has more than one part
          line[0][0] == part.arcs[0]) {   // first arc of first extracted part is first arc in ring
        line[0] = line.pop().concat(line[0]);
      }
    }
    prev = o;
    prevKey = key;
  }

  function onPart(o) {
    part = o;
  }

  return lines;
};


MapShaper.getArcClassifier = function(shapes, arcs) {
  var n = arcs.size(),
      a = new Int32Array(n),
      b = new Int32Array(n);

  utils.initializeArray(a, -1);
  utils.initializeArray(b, -1);

  MapShaper.traversePaths(shapes, function(o) {
    var i = absArcId(o.arcId);
    var shpId = o.shapeId;
    var aval = a[i];
    if (aval == -1) {
      a[i] = shpId;
    } else if (shpId < aval) {
      b[i] = aval;
      a[i] = shpId;
    } else {
      b[i] = shpId;
    }
  });

  function classify(i, getKey) {
    var key = '';
    if (a[i] > -1) {
      key = getKey(a[i], b[i]);
      if (key) {
        a[i] = -1;
        b[i] = -1;
      }
    }
    return key;
  }

  return function(getKey) {
    return function(i) {
      return classify(i, getKey);
    };
  };
};




api.inspect = function(lyr, arcs, opts) {
  var ids = MapShaper.selectFeatures(lyr, arcs, opts);
  var msg;
  if (ids.length == 1) {
    msg = MapShaper.getFeatureInfo(ids[0], lyr, arcs);
  } else {
    msg = utils.format("[inspect] Expression matched %d feature%s. Select one feature for details", ids.length, utils.pluralSuffix(ids.length));
  }
  message(msg);
};

MapShaper.getFeatureInfo = function(id, lyr, arcs) {
    var msg = "Feature " + id + '\n';
    msg += MapShaper.getGeometryInfo(lyr, id);
    msg += MapShaper.getShapeInfo(id, lyr, arcs);
    msg += MapShaper.getTableInfo(lyr, id);
    return msg;
};

MapShaper.getShapeInfo = function(id, lyr, arcs) {
  var shp = lyr.shapes ? lyr.shapes[id] : null;
  var type = lyr.geometry_type;
  var msg = '';
  var info;
  if (!shp || !type) {
    //
  } else if (type == 'point') {
    msg += '  Points: ' + shp.length + '\n';
  } else if (type == 'polyline') {
    msg += '  Parts: ' + shp.length + '\n';
  } else if (type == 'polygon') {
    info = MapShaper.getPolygonInfo(shp, arcs);
    msg += utils.format('  Rings: %d cw, %d ccw\n', info.cw, info.ccw);
    msg += '  Planar area: ' + info.area + '\n';
    if (info.sph_area) {
      msg += '  Spherical area: ' + info.sph_area + ' sq. meters\n';
    }
  }
  return msg;
};

MapShaper.getPolygonInfo = function(shp, arcs) {
  var o = {rings: shp.length, cw: 0, ccw: 0, area: 0};
  var area;
  for (var i=0; i<shp.length; i++) {
    area = geom.getPlanarPathArea(shp[i], arcs);
    if (area > 0) {
      o.cw++;
    } else if (area < 0) {
      o.ccw++;
    }
    o.area += area;
  }
  if (!arcs.isPlanar()) {
    o.sph_area = geom.getSphericalShapeArea(shp, arcs);
  }
  return o;
};

MapShaper.selectFeatures = function(lyr, arcs, opts) {
  var n = MapShaper.getFeatureCount(lyr),
      ids = [],
      filter;
  if (!opts.expression) {
    stop("[inspect] Missing a JS expression for selecting a feature");
  }
  filter = MapShaper.compileValueExpression(opts.expression, lyr, arcs);
  utils.repeat(n, function(id) {
    var result = filter(id);
    if (result === true) {
      ids.push(id);
    } else if (result !== false) {
      stop("[inspect] Expression must return true or false");
    }
  });
  return ids;
};




// Convert a string containing delimited text data into a dataset object
MapShaper.importDelim = function(str, opts) {
  var delim = MapShaper.guessDelimiter(str);
  return {
    layers: [{
      data: MapShaper.importDelimTable(str, delim, opts)
    }],
    info: {
      input_delimiter: delim
    }
  };
};

MapShaper.importDelimTable = function(str, delim, opts) {
  var records = require("d3-dsv").dsvFormat(delim).parse(str);
  var table;
  if (records.length === 0) {
    stop("[dsv] Unable to read any records");
  }
  delete records.columns; // added by d3-dsv
  MapShaper.adjustRecordTypes(records, opts && opts.field_types);
  table = new DataTable(records);
  MapShaper.deleteFields(table, MapShaper.isInvalidFieldName);
 return table;
};

MapShaper.supportedDelimiters = ['|', '\t', ',', ';'];

MapShaper.isSupportedDelimiter = function(d) {
  return utils.contains(MapShaper.supportedDelimiters, d);
};

MapShaper.guessDelimiter = function(content) {
  return utils.find(MapShaper.supportedDelimiters, function(delim) {
    var rxp = MapShaper.getDelimiterRxp(delim);
    return rxp.test(content);
  }) || ',';
};

// Get RegExp to test for a delimiter before first line break of a string
// Assumes that the first line does not contain alternate delim chars (this will
// be true if the first line has field headers composed of word characters).
MapShaper.getDelimiterRxp = function(delim) {
  var rxp = "^[^\\n\\r]+" + utils.regexEscape(delim);
  return new RegExp(rxp);
};

// Detect and convert data types of data from csv files.
// TODO: decide how to handle records with inconstent properties. Mapshaper
//    currently assumes tabular data
// @fieldList (optional) array of field names with type hints; may contain
//    duplicate names with inconsistent type hints.
MapShaper.adjustRecordTypes = function(records, fieldList) {
  var hintIndex = {},
      fields = Object.keys(records[0] || []),
      type;
  if (fieldList) {
    // parse optional type hints
    MapShaper.parseFieldHeaders(fieldList, hintIndex);
  }
  fields.forEach(function(key) {
    type = hintIndex[key] || MapShaper.detectConversionType(key, records);
    if (type == 'number') {
      MapShaper.convertDataField(records, key, utils.parseNumber);
    } else if (type == 'string') {
      MapShaper.convertDataField(records, key, utils.parseString);
    }
  });
};

MapShaper.convertDataField = function(records, name, f) {
  for (var i=0, n=records.length; i<n; i++) {
    records[i][name] = f(records[i][name]);
  }
};

// Returns 'string', 'number' or null
// Detection is based on value of first non-empty record
MapShaper.detectConversionType = function(name, records) {
  var type = null, val;
  for (var i=0, n=records.length; i<n; i++) {
    val = records[i][name];
    if (!!val && utils.isString(val)) {
      type = utils.stringIsNumeric(val) ? 'number' : 'string';
      break;
    }
  }
  return type;
};

// Accept a type hint from a header like "FIPS:str"
// Return standard type name (number|string) or null if hint is not recognized
MapShaper.validateFieldType = function(hint) {
  var str = hint.toLowerCase(),
      type = null;
  if (str[0] == 'n') {
    type = 'number';
  } else if (str[0] == 's') {
    type = 'string';
  }
  return type;
};

MapShaper.removeTypeHints = function(arr) {
  return MapShaper.parseFieldHeaders(arr, {});
};

// Look for type hints in array of field headers
// return index of field types
// modify @fields to remove type hints
//
MapShaper.parseFieldHeaders = function(fields, index) {
  var parsed = fields.map(function(raw) {
    var parts, name, type;
    if (raw.indexOf(':') != -1) {
      parts = raw.split(':');
      name = parts[0];
      type = MapShaper.validateFieldType(parts[1]);
      if (!type) {
        message("Invalid type hint (expected :str or :num) [" + raw + "]");
      }
    } else if (raw[0] === '+') { // d3-style type hint: unary plus
      name = raw.substr(1);
      type = 'number';
    } else {
      name = raw;
    }
    if (type) {
      index[name] = type;
    }
    return name;
  });
  return parsed;
};

utils.stringIsNumeric = function(str) {
  var parsed = utils.parseNumber(str);
  // exclude values like '300 E'
  return !isNaN(parsed) && parsed == Number(utils.cleanNumericString(str));
};

// Remove comma separators from strings
// TODO: accept European-style numbers?
utils.cleanNumericString = function(raw) {
  return String(raw).replace(/,/g, '');
};

// Assume: @raw is string, undefined or null
utils.parseString = function(raw) {
  return raw ? raw : "";
};

// Assume: @raw is string, undefined or null
// Use null instead of NaN for unparsable values
// (in part because if NaN is used, empty strings get converted to "NaN"
// when re-exported).
utils.parseNumber = function(raw) {
  var parsed = raw ? parseFloat(utils.cleanNumericString(raw)) : NaN;
  return isNaN(parsed) ? null : parsed;
};





api.joinPointsToPolygons = function(targetLyr, arcs, pointLyr, opts) {
  // TODO: copy points that can't be joined to a new layer
  var joinFunction = MapShaper.getPolygonToPointsFunction(targetLyr, arcs, pointLyr, opts);
  MapShaper.prepJoinLayers(targetLyr, pointLyr);
  return MapShaper.joinTables(targetLyr.data, pointLyr.data, joinFunction, opts);
};

api.joinPolygonsToPoints = function(targetLyr, polygonLyr, arcs, opts) {
  var joinFunction = MapShaper.getPointToPolygonFunction(targetLyr, polygonLyr, arcs, opts);
  MapShaper.prepJoinLayers(targetLyr, polygonLyr);
  return MapShaper.joinTables(targetLyr.data, polygonLyr.data, joinFunction, opts);
};

MapShaper.prepJoinLayers = function(targetLyr, srcLyr) {
  if (!targetLyr.data) {
    // create an empty data table if target layer is missing attributes
    targetLyr.data = new DataTable(targetLyr.shapes.length);
  }
  if (!srcLyr.data) {
    stop("[join] Can't join a layer that is missing attribute data");
  }
};

MapShaper.getPolygonToPointsFunction = function(polygonLyr, arcs, pointLyr, opts) {
  var joinFunction = MapShaper.getPointToPolygonFunction(pointLyr, polygonLyr, arcs, opts);
  var index = [];
  var hit, polygonId;
  for (var i=0, n=pointLyr.shapes.length; i<n; i++) {
    hit = joinFunction(i);
    if (hit) {
      polygonId = hit[0]; // TODO: handle multiple hits
      if (polygonId in index) {
        index[polygonId].push(i);
      } else {
        index[polygonId] = [i];
      }
    }
  }
  // @i id of a polygon feature
  return function(i) {
    return index[i] || null;
  };
};

MapShaper.getPointToPolygonFunction = function(pointLyr, polygonLyr, arcs, opts) {
  var index = new PathIndex(polygonLyr.shapes, arcs),
      points = pointLyr.shapes;

  // @i id of a point feature
  return function(i) {
    var shp = points[i],
        shpId = -1;
    if (shp) {
      // TODO: handle multiple hits
      shpId = index.findEnclosingShape(shp[0]);
    }
    return shpId == -1 ? null : [shpId];
  };
};




api.join = function(targetLyr, dataset, opts) {
  var src, srcLyr, srcType, targetType, retn;
  if (opts.keys) {
    // join using data in attribute fields
    if (opts.keys.length != 2) {
      stop("[join] Expected two key fields: a target field and a source field");
    }
    src = MapShaper.getJoinTable(dataset, opts);
    retn = api.joinAttributesToFeatures(targetLyr, src, opts);
  } else {
    // spatial join
    src = MapShaper.getJoinDataset(dataset, opts);
    if (!src) {
      stop("[join] Missing a joinable data source");
    }
    srcLyr = src.layers[0];
    srcType = srcLyr.geometry_type;
    targetType = targetLyr.geometry_type;
    if (srcType == 'point' && targetType == 'polygon') {
      retn = api.joinPointsToPolygons(targetLyr, dataset.arcs, srcLyr, opts);
    } else if (srcType == 'polygon' && targetType == 'point') {
      retn = api.joinPolygonsToPoints(targetLyr, srcLyr, src.arcs, opts);
    } else {
      stop(utils.format("[join] Unable to join %s geometry to %s geometry",
          srcType || 'null', targetType || 'null'));
    }
  }

  if (retn.unmatched) {
    dataset.layers.push(retn.unmatched);
  }
  if (retn.unjoined) {
    dataset.layers.push(retn.unjoined);
  }
};

// Get a DataTable to join, either from a current layer or from a file.
MapShaper.getJoinTable = function(dataset, opts) {
  var layers = MapShaper.findMatchingLayers(dataset.layers, opts.source),
      table;
  if (layers.length > 0) {
    table = layers[0].data;
  } else {
    table = api.importJoinTable(opts.source, opts);
  }
  return table;
};

// Get a dataset containing a source layer to join
// TODO: remove duplication with getJoinTable()
MapShaper.getJoinDataset = function(dataset, opts) {
  var layers = MapShaper.findMatchingLayers(dataset.layers, opts.source);
  if (!layers.length) {
    dataset = api.importFile(opts.source, opts);
    layers = dataset.layers;
  }
  return layers.length ? {arcs: dataset.arcs, layers: [layers[0]]} : null;
};

api.importJoinTable = function(file, opts) {
  var fieldsWithTypeHints = [];
  if (opts.keys) {
    fieldsWithTypeHints.push(opts.keys[1]);
  }
  if (opts.fields) {
    fieldsWithTypeHints = fieldsWithTypeHints.concat(opts.fields);
  }
  if (opts.field_types) {
    fieldsWithTypeHints = fieldsWithTypeHints.concat(opts.field_types);
  }
  var importOpts = utils.defaults({field_types: fieldsWithTypeHints}, opts);
  return api.importDataTable(file, importOpts);
};

api.joinAttributesToFeatures = function(lyr, srcTable, opts) {
  var keys = MapShaper.removeTypeHints(opts.keys),
      destKey = keys[0],
      srcKey = keys[1],
      destTable = lyr.data,
      // exclude source key field from join unless explicitly listed
      joinFields = opts.fields || utils.difference(srcTable.getFields(), [srcKey]),
      joinFunction = MapShaper.getJoinByKey(destTable, destKey, srcTable, srcKey);

  opts = utils.defaults({fields: joinFields}, opts);
  return MapShaper.joinTables(destTable, srcTable, joinFunction, opts);
};

MapShaper.joinTables = function(dest, src, join, opts) {
  var srcRecords = src.getRecords(),
      destRecords = dest.getRecords(),
      unmatchedRecords = [],
      joinFields = MapShaper.getFieldsToJoin(dest, src, opts),
      sumFields = opts.sum_fields || [],
      copyFields = utils.difference(joinFields, sumFields),
      countField = MapShaper.getCountFieldName(dest.getFields()),
      addCountField = sumFields.length > 0, // add a count field if we're aggregating records
      joinCounts = new Uint32Array(srcRecords.length),
      matchCount = 0,
      collisionCount = 0,
      retn = {},
      srcRec, srcId, destRec, joinIds, joins, count, filter;

  if (opts.where) {
    filter = MapShaper.getJoinFilter(src, opts.where);
  }

  // join source records to target records
  for (var i=0, n=destRecords.length; i<n; i++) {
    destRec = destRecords[i];
    joins = join(i);
    count = 0;
    for (var j=0, m=joins ? joins.length : 0; j<m; j++) {
      srcId = joins[j];
      if (filter && !filter(srcId)) {
        continue;
      }
      srcRec = srcRecords[srcId];
      if (copyFields.length > 0) {
        if (count === 0) {
          // only copying the first match
          MapShaper.joinByCopy(destRec, srcRec, copyFields);
        } else {
          collisionCount++;
        }
      }
      if (sumFields.length > 0) {
        MapShaper.joinBySum(destRec, srcRec, sumFields);
      }
      joinCounts[srcId]++;
      count++;
    }
    if (count > 0) {
      matchCount++;
    } else if (destRec) {
      if (opts.unmatched) {
        // Save a copy of unmatched record, before null values from join fields
        // are added.
        unmatchedRecords.push(utils.extend({}, destRec));
      }
      MapShaper.updateUnmatchedRecord(destRec, copyFields, sumFields);
    }
    if (addCountField) {
      destRec[countField] = count;
    }
  }
  if (matchCount === 0) {
    stop("[join] No records could be joined");
  }

  MapShaper.printJoinMessage(matchCount, destRecords.length,
      MapShaper.countJoins(joinCounts), srcRecords.length, collisionCount);

  if (opts.unjoined) {
    retn.unjoined = {
      name: 'unjoined',
      data: new DataTable(srcRecords.filter(function(o, i) {
        return joinCounts[i] === 0;
      }))
    };
  }
  if (opts.unmatched) {
    retn.unmatched = {
      name: 'unmatched',
      data: new DataTable(unmatchedRecords)
    };
  }
  return retn;
};

MapShaper.countJoins = function(counts) {
  var joinCount = 0;
  for (var i=0, n=counts.length; i<n; i++) {
    if (counts[i] > 0) {
      joinCount++;
    }
  }
  return joinCount;
};

// Unset fields of unmatched records get null/empty values
MapShaper.updateUnmatchedRecord = function(rec, copyFields, sumFields) {
  MapShaper.joinByCopy(rec, {}, copyFields);
  MapShaper.joinBySum(rec, {}, sumFields);
};

MapShaper.getCountFieldName = function(fields) {
  var uniq = MapShaper.getUniqFieldNames(fields.concat("joins"));
  return uniq.pop();
};

MapShaper.joinByCopy = function(dest, src, fields) {
  var f;
  for (var i=0, n=fields.length; i<n; i++) {
    // dest[fields[i]] = src[fields[i]];
    // Use null when the source record is missing an expected value
    // TODO: think some more about whether this is desirable
    f = fields[i];
    if (Object.prototype.hasOwnProperty.call(src, f)) {
      dest[f] = src[f];
    } else if (!Object.prototype.hasOwnProperty.call(dest, f)) {
      dest[f] = null;
    }
  }
};

MapShaper.joinBySum = function(dest, src, fields) {
  var f;
  for (var j=0; j<fields.length; j++) {
    f = fields[j];
    dest[f] = (dest[f] || 0) + (src[f] || 0);
  }
};

MapShaper.printJoinMessage = function(matches, n, joins, m, collisions) {
  // TODO: add tip for generating layer containing unmatched records, when
  // this option is implemented.
  message(utils.format("[join] Joined %'d data record%s", joins, utils.pluralSuffix(joins)));
  if (matches < n) {
    message(utils.format('[join] %d/%d target records received no data', n-matches, n));
  }
  if (joins < m) {
    message(utils.format("[join] %d/%d source records could not be joined", m-joins, m));
  }
  if (collisions > 0) {
    message(utils.format("[join] %'d collision%s occured; data was copied from the first matching source record",
      collisions, utils.pluralSuffix(collisions)));
  }
};

MapShaper.getFieldsToJoin = function(destTable, srcTable, opts) {
  var joinFields;
  if (opts.fields) {
    joinFields = MapShaper.removeTypeHints(opts.fields);
  } else {
    // If a list of fields to join is not given, try to join all the
    // source fields except the key field.
    joinFields = srcTable.getFields();
  }
  if (!opts.force) {
    // only overwrite existing fields if the "force" option is set.
    joinFields = utils.difference(joinFields, destTable.getFields());
  }
  return joinFields;
};

// Return a function for translating a target id to an array of source ids based on values
// of two key fields.
MapShaper.getJoinByKey = function(dest, destKey, src, srcKey) {
  var destRecords = dest.getRecords();
  var index = MapShaper.createTableIndex(src.getRecords(), srcKey);
  if (src.fieldExists(srcKey) === false) {
    stop("[join] External table is missing a field named:", srcKey);
  }
  if (!dest || !dest.fieldExists(destKey)) {
    stop("[join] Target layer is missing key field:", destKey);
  }
  return function(i) {
    var destRec = destRecords[i],
        val = destRec && destRec[destKey],
        retn = null;
    if (destRec && val in index) {
      retn = index[val];
    }
    return retn;
  };
};

MapShaper.getJoinFilter = function(data, exp) {
  var test =  MapShaper.compileValueExpression(exp, {data: data}, null);
  return function(i) {
    var retn = test(i);
    if (retn !== true && retn !== false) {
      stop('[join] "where" expression must return true or false');
    }
    return retn;
  };
};

MapShaper.createTableIndex = function(records, f) {
  var index = {}, rec, key;
  for (var i=0, n=records.length; i<n; i++) {
    rec = records[i];
    key = rec[f];
    if (key in index) {
      index[key].push(i);
    } else {
      index[key] = [i];
    }
  }
  return index;
};




api.keepEveryPolygon =
MapShaper.keepEveryPolygon = function(arcData, layers) {
  T.start();
  layers.forEach(function(lyr) {
    if (lyr.geometry_type == 'polygon') {
      MapShaper.protectLayerShapes(arcData, lyr.shapes);
    }
  });
  T.stop("Protect shapes");
};

MapShaper.protectLayerShapes = function(arcData, shapes) {
  shapes.forEach(function(shape) {
    MapShaper.protectShape(arcData, shape);
  });
};

// Protect a single shape from complete removal by simplification
// @arcData an ArcCollection
// @shape an array containing one or more arrays of arc ids, or null if null shape
//
MapShaper.protectShape = function(arcData, shape) {
  var maxArea = 0,
      arcCount = shape ? shape.length : 0,
      maxRing, area;
  // Find ring with largest bounding box
  for (var i=0; i<arcCount; i++) {
    area = arcData.getSimpleShapeBounds(shape[i]).area();
    if (area > maxArea) {
      maxRing = shape[i];
      maxArea = area;
    }
  }

  if (!maxRing || maxRing.length === 0) {
    // invald shape
    verbose("[protectShape()] Invalid shape:", shape);
  } else if (maxRing.length == 1) {
    MapShaper.protectIslandRing(arcData, maxRing);
  } else {
    MapShaper.protectMultiRing(arcData, maxRing);
  }
};

// Add two vertices to the ring to form a triangle.
// Assuming that this will inflate the ring.
// Consider using the function for multi-arc rings, which
//   calculates ring area...
MapShaper.protectIslandRing = function(arcData, ring) {
  var added = MapShaper.lockMaxThreshold(arcData, ring);
  if (added == 1) {
    added += MapShaper.lockMaxThreshold(arcData, ring);
  }
  if (added < 2) verbose("[protectIslandRing()] Failed on ring:", ring);
};

MapShaper.protectMultiRing = function(arcData, ring) {
  var zlim = arcData.getRetainedInterval(),
      minArea = 0, // 0.00000001, // Need to handle rounding error?
      area, added;
  arcData.setRetainedInterval(Infinity);
  area = geom.getPlanarPathArea(ring, arcData);
  while (area <= minArea) {
    added = MapShaper.lockMaxThreshold(arcData, ring);
    if (added === 0) {
      verbose("[protectMultiRing()] Failed on ring:", ring);
      break;
    }
    area = geom.getPlanarPathArea(ring, arcData);
  }
  arcData.setRetainedInterval(zlim);
};

// Protect the vertex or vertices with the largest non-infinite
// removal threshold in a ring.
//
MapShaper.lockMaxThreshold = function(arcData, ring) {
  var targZ = 0,
      targArcId,
      raw = arcData.getVertexData(),
      arcId, id, z,
      start, end;

  for (var i=0; i<ring.length; i++) {
    arcId = ring[i];
    if (arcId < 0) arcId = ~arcId;
    start = raw.ii[arcId];
    end = start + raw.nn[arcId] - 1;
    id = MapShaper.findNextRemovableVertex(raw.zz, Infinity, start, end);
    if (id == -1) continue;
    z = raw.zz[id];
    if (z > targZ) {
      targZ = z;
      targArcId = arcId;
    }
  }
  if (targZ > 0) {
    // There may be more than one vertex with the target Z value; lock them all.
    start = raw.ii[targArcId];
    end = start + raw.nn[targArcId] - 1;
    return MapShaper.replaceInArray(raw.zz, targZ, Infinity, start, end);
  }
  return 0;
};

MapShaper.replaceInArray = function(zz, value, replacement, start, end) {
  var count = 0;
  for (var i=start; i<=end; i++) {
    if (zz[i] === value) {
      zz[i] = replacement;
      count++;
    }
  }
  return count;
};




// WORK IN PROGRESS
// Remove 'cuts' in an unprojected dataset at the antemeridian and poles.
// This will be useful when generating rotated projections.
//
api.stitch = function(dataset) {
  var arcs = dataset.arcs,
      edgeArcs, dissolver, nodes;
  if (!arcs || arcs.isPlanar()) {
    error("[stitch] Requires lat-lng dataset");
  }
  if (!MapShaper.snapEdgeArcs(arcs)) {
    return;
  }
  nodes = MapShaper.divideArcs(dataset);
  // console.log(arcs.toArray())

  dissolver = MapShaper.getPolygonDissolver(nodes, !!'spherical');
  dataset.layers.forEach(function(lyr) {
    if (lyr.geometry_type != 'polygon') return;
    var shapes = lyr.shapes,
        edgeShapeIds = MapShaper.findEdgeShapes(shapes, arcs);
    edgeShapeIds.forEach(function(i) {
      shapes[i] = dissolver(shapes[i]);
    });
  });
};

// TODO: test with 'wrapped' datasets
MapShaper.findEdgeArcs = function(arcs) {
  var bbox = MapShaper.getWorldBounds(),
      ids = [];
  for (var i=0, n=arcs.size(); i<n; i++) {
    if (!arcs.arcIsContained(i, bbox)) {
      ids.push(i);
    }
  }
  return ids;
};

MapShaper.findEdgeShapes = function(shapes, arcs) {
  var arcIds = MapShaper.findEdgeArcs(arcs);
  return MapShaper.findShapesByArcId(shapes, arcIds, arcs.size());
};

// Snap arcs that either touch poles or prime meridian to 0 degrees longitude
// Return array of affected arc ids
MapShaper.snapEdgeArcs = function(arcs) {
  var data = arcs.getVertexData(),
      xx = data.xx,
      yy = data.yy,
      onEdge = false,
      e = 1e-10, // TODO: justify this...
      xmin = -180,
      xmax = 180,
      ymin = -90,
      ymax = 90,
      lat, lng;
  for (var i=0, n=xx.length; i<n; i++) {
    lat = yy[i];
    lng = xx[i];
    if (lng <= xmin + e || lng >= xmax - e) {
      onEdge = true;
      xx[i] = xmin;
      // console.log(">>> snapped lat:", lat, "lng:", lng, "to lng:", xmin);
    }
    if (lat <= ymin + e) {
      onEdge = true;
      yy[i] = ymin;
      xx[i] = xmin;
    } else if (lat >= ymax - e) {
      onEdge = true;
      yy[i] = ymax;
      xx[i] = xmin;
    }
  }
  return onEdge;
};




// Merge similar layers in a dataset, in-place
api.mergeLayers = function(layers) {
  var index = {},
      merged = [];

  // layers with same key can be merged
  function layerKey(lyr) {
    var key = lyr.geometry_type || '';
    if (lyr.data) {
      key += '~' + lyr.data.getFields().sort().join(',');
    }
    return key;
  }

  layers.forEach(function(lyr) {
    var key = layerKey(lyr),
        indexedLyr,
        records;
    if (key in index === false) {
      index[key] = lyr;
      merged.push(lyr);
    } else {
      indexedLyr = index[key];
      indexedLyr.name = utils.mergeNames(indexedLyr.name, lyr.name);
      indexedLyr.shapes = indexedLyr.shapes.concat(lyr.shapes);
      if (indexedLyr.data) {
        records = indexedLyr.data.getRecords().concat(lyr.data.getRecords());
        indexedLyr.data = new DataTable(records);
      }
    }
  });

  if (merged.length >= 2) {
    stop("[merge-layers] Unable to merge " + (merged.length < layers.length ? "some " : "") + "layers. Geometry and data fields must be compatible.");
  }

  return merged;
};




// Don't modify input layers (mergeDatasets() updates arc ids in-place)
MapShaper.mergeDatasetsForExport = function(arr) {
  // copy layers but not arcs, which get copied in mergeDatasets()
  var copy = arr.map(function(dataset) {
    return utils.defaults({
      layers: dataset.layers.map(MapShaper.copyLayerShapes)
    }, dataset);
  });
  return MapShaper.mergeDatasets(copy);
};

MapShaper.mergeDatasets = function(arr) {
  var arcSources = [],
      arcCount = 0,
      mergedLayers = [],
      mergedArcs;

  arr.forEach(function(data) {
    var n = data.arcs ? data.arcs.size() : 0;
    if (n > 0) {
      arcSources.push(data.arcs);
    }
    data.layers.forEach(function(lyr) {
      if (lyr.geometry_type == 'polygon' || lyr.geometry_type == 'polyline') {
        // reindex arc ids
        MapShaper.forEachArcId(lyr.shapes, function(id) {
          return id < 0 ? id - arcCount : id + arcCount;
        });
      }
      mergedLayers.push(lyr);
    });
    arcCount += n;
  });

  mergedArcs = MapShaper.mergeArcs(arcSources);
  if (mergedArcs.size() != arcCount) {
    error("[mergeDatasets()] Arc indexing error");
  }

  return {
    arcs: mergedArcs,
    layers: mergedLayers
  };
};

MapShaper.mergeArcs = function(arr) {
  var dataArr = arr.map(function(arcs) {
    if (arcs.getRetainedInterval() > 0) {
      verbose("Baking-in simplification setting.");
      arcs.flatten();
    }
    return arcs.getVertexData();
  });
  var xx = utils.mergeArrays(utils.pluck(dataArr, 'xx'), Float64Array),
      yy = utils.mergeArrays(utils.pluck(dataArr, 'yy'), Float64Array),
      nn = utils.mergeArrays(utils.pluck(dataArr, 'nn'), Int32Array);

  return new ArcCollection(nn, xx, yy);
};

utils.countElements = function(arrays) {
  return arrays.reduce(function(memo, arr) {
    return memo + (arr.length || 0);
  }, 0);
};

utils.mergeArrays = function(arrays, TypedArr) {
  var size = utils.countElements(arrays),
      Arr = TypedArr || Array,
      merged = new Arr(size),
      offs = 0;
  arrays.forEach(function(src) {
    var n = src.length;
    for (var i = 0; i<n; i++) {
      merged[i + offs] = src[i];
    }
    offs += n;
  });
  return merged;
};




api.mergeFiles = function(files, opts) {
  var datasets = files.map(function(fname) {
    // import without topology or snapping
    var importOpts = utils.defaults({no_topology: true, auto_snap: false, snap_interval: null, files: [fname]}, opts);
    return api.importFile(fname, importOpts);
  });

  // Don't allow multiple input formats
  var formats = datasets.map(function(d) {
    return d.info.input_format;
  });
  if (utils.uniq(formats).length != 1) {
    stop("Importing files with different formats is not supported");
  }

  var merged = MapShaper.mergeDatasets(datasets);
  // kludge -- using info property of first dataset
  merged.info = datasets[0].info;
  merged.info.input_files = files;

  // Don't try to re-build topology of TopoJSON files
  // TODO: consider updating topology of TopoJSON files instead of concatenating arcs
  // (but problem of mismatched coordinates due to quantization in input files.)
  if (!opts.no_topology && merged.info.input_format != 'topojson') {
    // TODO: remove duplication with mapshaper-path-import.js; consider applying
    //   snapping option inside buildTopology()
    if (opts.auto_snap || opts.snap_interval) {
      T.start();
      MapShaper.snapCoords(merged.arcs, opts.snap_interval);
      T.stop("Snapping points");
    }

    api.buildTopology(merged);
  }

  if (opts.merge_files) {
    merged.layers = api.mergeLayers(merged.layers);
  }
  return merged;
};




api.createPointLayer = function(srcLyr, arcs, opts) {
  var destLyr = MapShaper.getOutputLayer(srcLyr, opts);
  destLyr.shapes = opts.x || opts.y ?
      MapShaper.pointsFromDataTable(srcLyr.data, opts) :
      MapShaper.pointsFromPolygons(srcLyr, arcs, opts);
  destLyr.geometry_type = 'point';

  var nulls = destLyr.shapes.reduce(function(sum, shp) {
    if (!shp) sum++;
    return sum;
  }, 0);

  if (nulls > 0) {
    message(utils.format('[points] %,d of %,d points are null', nulls, destLyr.shapes.length));
  }
  if (srcLyr.data) {
    destLyr.data = opts.no_replace ? srcLyr.data.clone() : srcLyr.data;
  }
  return destLyr;
};

MapShaper.pointsFromPolygons = function(lyr, arcs, opts) {
  if (lyr.geometry_type != "polygon") {
    stop("[points] Expected a polygon layer");
  }
  var func = opts.inner ? geom.findInteriorPoint : geom.getShapeCentroid;
  return lyr.shapes.map(function(shp) {
    var p = func(shp, arcs);
    return p ? [[p.x, p.y]] : null;
  });
};

MapShaper.pointsFromDataTable = function(data, opts) {
  if (!data) stop("[points] Layer is missing a data table");
  if (!opts.x || !opts.y || !data.fieldExists(opts.x) || !data.fieldExists(opts.y)) {
    stop("[points] Missing x,y data fields");
  }

  return data.getRecords().map(function(rec) {
    var x = rec[opts.x],
        y = rec[opts.y];
    if (!utils.isFiniteNumber(x) || !utils.isFiniteNumber(y)) {
      return null;
    }
    return [[x, y]];
  });

};




MapShaper.projectionIndex = {
  webmercator: WebMercator,
  mercator: Mercator,
  albers: AlbersEqualAreaConic,
  albersusa: AlbersNYT,
  albersnyt: AlbersNYT,
  lambertcc: LambertConformalConic,
  transversemercator: TransverseMercator,
  utm: UTM,
  winkeltripel: WinkelTripel,
  robinson: Robinson
};

var DEG2RAD = Math.PI / 180.0;

// @params (optional) array of decimal-degree params that should be present in opts
function initProj(proj, name, opts, params) {
  var base = {
    spherical: false, // Toggle for spherical / ellipsoidal formulas
    x0: 0,   // false easting (used by UTM and some other projections)
    y0: 0,   // false northing
    k0: 1,   // scale factor
    to_meter: 1,
    R: 6378137, // Earth radius / semi-major axis (spherical / ellipsoidal formulas)
    // E: flattening parameter for GRS80 ellipsoid (others not supported)
    E: 0.0818191908426214943348,

    projectLatLng: function(lat, lng, xy) {
      xy = xy || {};
      this.forward(lng * DEG2RAD, lat * DEG2RAD, xy);
      xy.x = (this.R * xy.x + this.x0) / this.to_meter;
      xy.y = (this.R * xy.y + this.y0) / this.to_meter;
      return xy;
    },
    unprojectXY: function(x, y, ll) {
      x = (x * this.to_meter - this.x0) / this.R;
      y = (y * this.to_meter - this.y0) / this.R;
      ll = ll || {};
      this.inverse(x , y, ll);
      ll.lat /= DEG2RAD;
      ll.lng /= DEG2RAD;
      return ll;
    },
    // Approximate the inverse ellipsoidal projection function when
    // the forward ellipsoidal formula and both spheroidal formulas are known.
    // (Many ellipsoidal inverse projections lack closed formulas and/or are a hassle to implement).
    // Accuracy depends on # of iterations, projection, etc.
    // n of 4 gives ~1e-10 degree accuracy with Lambert CC.
    inverseEllApprox: function(x, y, ll) {
      var xy = {};
      var dx = 0, dy = 0;
      var n = 4;
      while (true) {
        this.spherical = true;
        this.inverse(x + dx, y + dy, ll);
        this.spherical = false;
        if (!--n) break;
        this.forward(ll.lng, ll.lat, xy);
        dx += x - xy.x;
        dy += y - xy.y;
      }
    }
  };
  opts = utils.extend({}, opts); // make a copy, don't modify original param
  if (params) {
    // check for required decimal degree parameters and convert to radians
    params.forEach(function(param) {
      if (param in opts === false) {
        throw new Error('[' + name + '] Missing required parameter:', param);
      }
      opts[param] = opts[param] * DEG2RAD;
    });
  }
  utils.extend(proj, base, opts);
  proj.name = name;
  if (opts.units) {
    proj.to_meter = initProjUnits(opts.units);
  }
}

// Return multiplier for converting to meters
function initProjUnits(units) {
  units = units.toLowerCase().replace(/-_/g, '');
  var k = {
      meters: 1,
      feet: 0.3048,
      usfeet: 0.304800609601219 }[units];
  if (!k) {
    throw new Error("[proj] Unsupported units, use to_meter param:", units);
  }
  return 1 / k;
}

function WebMercator() {
  return new Mercator({spherical: true});
}

// Optional param: lng0 (in decimal degrees)
function Mercator(opts) {
  opts = utils.extend({lng0: 0}, opts);
  initProj(this, 'mercator', opts, ['lng0']);
  this.forward = function(lng, lat, xy) {
    xy.x = lng - this.lng0;
    if (!this.spherical) {
      xy.y = Math.log(Math.tan(Math.PI * 0.25 + lat * 0.5) *
        Math.pow((1 - this.E * Math.sin(lat)) / (1 + this.E * Math.sin(lat)), this.E * 0.5));
    } else {
      xy.y = Math.log(Math.tan(Math.PI * 0.25 + lat * 0.5));
    }
  };
  this.inverse = function(x, y, ll) {
    if (!this.spherical) {
      this.inverseEllApprox(x, y, ll);
    } else {
      ll.lng = x + this.lng0;
      ll.lat = Math.PI * 0.5 - 2 * Math.atan(Math.exp(-y));
    }
  };
}

function UTM(opts) {
  var m = /^([\d]+)([NS])$/.exec(opts.zone || "");
  if (!m) {
    throw new Error("[UTM] Expected a UTM zone parameter of the form: 17N");
  }
  var z = parseFloat(m[1]);
  var proj = new TransverseMercator({
    k0: 0.9996,
    lng0: z * 6 - 183,
    lat0: 0,
    x0: 500000,
    y0: m[2] == 'S' ? 1e7 : 0
  });
  return proj;
}

function TransverseMercator(opts) {
  initProj(this, 'transverse_mercator', opts, ['lat0', 'lng0']);
  var _m0 = calcTransMercM(this.lat0, this.E);
  this.forward = function(lng, lat, xy) {
    if (this.spherical) {
      var B = Math.cos(lat) * Math.sin(lng - this.lng0);
      xy.x = 0.5 * this.k0 * Math.log((1 + B) / (1 - B));
      xy.y = this.k0 * (Math.atan(Math.tan(lat) / Math.cos(lng - this.lng0)) - this.lat0);
    } else {
      var e2 = this.E * this.E,
          ep2 = e2 / (1 - e2),
          sinLat = Math.sin(lat),
          cosLat = Math.cos(lat),
          tanLat = Math.tan(lat),
          n = 1 / Math.sqrt(1 - e2 * sinLat * sinLat),
          t = tanLat * tanLat,
          c = ep2 * cosLat * cosLat,
          a = cosLat * (lng - this.lng0),
          a2 = a * a,
          m = calcTransMercM(lat, this.E);
      xy.x = this.k0 * n * (a + a * a2 / 6 * (1 - t + c) +
        a2 * a2 * a / 120 * (5 - 18 * t + t * t + 72 * c - 58 * ep2));
      xy.y = this.k0 * (m - _m0 + n * tanLat *
        (a2 / 2 + a2 * a2 / 24 * (5 - t + 9 * c + 4 * c * c)));
    }
  };
  this.inverse = function(x, y, ll) {
    if (this.spherical) {
      var D = y / this.k0 + this.lat0;
      ll.lat = Math.asin(Math.sin(D) / cosh(x / this.k0));
      ll.lng = this.lng0 + Math.atan(sinh(x / this.k0) / Math.cos(D));
    } else {
      this.inverseEllApprox(x, y, ll);
    }
  };
}

// Authalic sin
function sinh(x) {
  return (Math.exp(x) - Math.exp(-x)) * 0.5;
}

// Authalic cosine
function cosh(x) {
  return (Math.exp(x) + Math.exp(-x)) * 0.5;
}

function calcTransMercM(lat, e) {
  var e2 = e * e,
      e4 = e2 * e2,
      e6 = e4 * e2;
  return (lat * (1 - e2 / 4.0 - 3 * e4 / 64 - 5 * e6 / 256) -
    Math.sin(2 * lat) * (3 * e2 / 8 + 3 * e4 / 32 + 45 * e6 / 1024) +
    Math.sin(4 * lat) * (15 * e4 / 256 + 45 * e6 / 1024) -
    Math.sin(6 * lat) * (35 * e6 / 3072));
}

function AlbersNYT(opts) {
  var lambert = new LambertConformalConic({lng0:-96, lat1:33, lat2:45, lat0:39, spherical: true});
  return new MixedProjection(new AlbersUSA(opts))
    .addFrame(lambert, {lat:63, lng:-152}, {lat:27, lng:-115}, 6e6, 3e6, 0.31, 29.2)  // AK
    .addFrame(lambert, {lat:20.9, lng:-157}, {lat:28.2, lng:-106.6}, 3e6, 5e6, 0.9, 40); // HI
}

function AlbersUSA(opts) {
  return new AlbersEqualAreaConic(utils.extend({lng0:-96, lat1:29.5, lat2:45.5, lat0:37.5}, opts));
}

/*
function LambertUSA() {
  return new LambertConformalConic({lng0:-96, lat1:33, lat2:45, lat0:39});
}
*/

// Parameters (in decimal degrees):
//   lng0  Reference longitude
//   lat0  Reference latitude
//   lat1  First standard parallel
//   lat2  Second standard parallel
function AlbersEqualAreaConic(opts) {
  initProj(this, 'albers', opts, ['lat0', 'lat1', 'lat2', 'lng0']);
  var E = this.E;
  var cosLat1 = Math.cos(this.lat1),
      sinLat1 = Math.sin(this.lat1),
      _sphN = 0.5 * (sinLat1 + Math.sin(this.lat2)),
      _sphC = cosLat1 * cosLat1 + 2.0 * _sphN * sinLat1,
      _sphRho0 = Math.sqrt(_sphC - 2.0 * _sphN * Math.sin(this.lat0)) / _sphN;

  var m1 = calcAlbersMell(E, this.lat1),
      m2 = calcAlbersMell(E, this.lat2),
      q0 = calcAlbersQell(E, this.lat0),
      q1 = calcAlbersQell(E, this.lat1),
      q2 = calcAlbersQell(E, this.lat2),
      _ellN = (m1 * m1 - m2 * m2) / (q2 - q1),
      _ellC = m1 * m1 + _ellN * q1,
      _ellRho0 = Math.sqrt(_ellC - _ellN * q0) / _ellN,
      _ellAuthConst = 1 - (1 - E * E) / (2 * E) * Math.log((1 - E) / (1 + E));

  this.forward = function(lng, lat, xy) {
    var rho, theta, q;
    if (!this.spherical) {
      q = calcAlbersQell(E, lat);
      rho = Math.sqrt(_ellC - _ellN * q) / _ellN;
      theta = _ellN * (lng - this.lng0);
      xy.x = rho * Math.sin(theta);
      xy.y = _ellRho0 - rho * Math.cos(theta);
    } else {
      rho = Math.sqrt(_sphC - 2 * _sphN * Math.sin(lat)) / _sphN;
      theta = _sphN * (lng - this.lng0);
      xy.x = rho * Math.sin(theta);
      xy.y = _sphRho0 - rho * Math.cos(theta);
    }
  };

  this.inverse = function(x, y, ll) {
    var rho, theta, e2, e4, q, beta;
    if (!this.spherical) {
      theta = Math.atan(x / (_ellRho0 - y));
      ll.lng = this.lng0 + theta / _ellN;
      e2 = E * E;
      e4 = e2 * e2;
      rho = Math.sqrt(x * x + (_ellRho0 - y) * (_ellRho0 - y));
      q = (_ellC - rho * rho * _ellN * _ellN) / _ellN;
      beta = Math.asin(q / _ellAuthConst);
      ll.lat = beta + Math.sin(2 * beta) *
        (e2 / 3 + 31 * e4 / 180 + 517 * e4 * e2 / 5040) +
        Math.sin(4 * beta) * (23 * e4 / 360 + 251 * e4 * e2 / 3780) +
        Math.sin(6 * beta) * 761 * e4 * e2 / 45360;
    } else {
      rho = Math.sqrt(x * x + (_sphRho0 - y) * (_sphRho0 - y));
      theta = Math.atan(x / (_sphRho0 - y));
      ll.lat = Math.asin((_sphC - rho * rho * _sphN * _sphN) * 0.5 / _sphN);
      ll.lng = theta / _sphN + this.lng0;
    }
  };
}

function calcAlbersQell(e, lat) {
  var sinLat = Math.sin(lat);
  return (1 - e * e) * (sinLat / (1 - e * e * sinLat * sinLat) -
    0.5 / e * Math.log((1 - e * sinLat) / (1 + e * sinLat)));
}

function calcAlbersMell(e, lat) {
  var sinLat = Math.sin(lat);
  return Math.cos(lat) / Math.sqrt(1 - e * e * sinLat * sinLat);
}

// Parameters (in decimal degrees):
//   lng0  Reference longitude
//   lat0  Reference latitude
//   lat1  First standard parallel
//   lat2  Second standard parallel
function LambertConformalConic(opts) {
  initProj(this, 'lambertcc', opts, ['lat0', 'lat1', 'lat2', 'lng0']);
  var E = this.E;
  var _sphN = Math.log(Math.cos(this.lat1) / Math.cos(this.lat2)) /
    Math.log(Math.tan(Math.PI / 4.0 + this.lat2 / 2.0) /
    Math.tan(Math.PI / 4.0 + this.lat1 / 2.0));
  var _sphF = Math.cos(this.lat1) *
    Math.pow(Math.tan(Math.PI / 4.0 + this.lat1 / 2.0), _sphN) / _sphN;
  var _sphRho0 = _sphF /
    Math.pow(Math.tan(Math.PI / 4.0 + this.lat0 / 2.0), _sphN);
  var _ellN = (Math.log(calcLambertM(this.lat1, E)) -
    Math.log(calcLambertM(this.lat2, E))) /
    (Math.log(calcLambertT(this.lat1, E)) -
    Math.log(calcLambertT(this.lat2, E)));
  var _ellF = calcLambertM(this.lat1, E) / (_ellN *
    Math.pow(calcLambertT(this.lat1, E), _ellN));
  var _ellRho0 = _ellF *
    Math.pow(calcLambertT(this.lat0, E), _ellN);

  this.forward = function(lng, lat, xy) {
    var rho, theta;
    if (!this.spherical) {
      var t = calcLambertT(lat, E);
      rho = _ellF * Math.pow(t, _ellN);
      theta = _ellN * (lng - this.lng0);
      xy.x = rho * Math.sin(theta);
      xy.y = _ellRho0 - rho * Math.cos(theta);
    } else {
      rho = _sphF /
        Math.pow(Math.tan(Math.PI / 4 + lat / 2.0), _sphN);
      theta = _sphN * (lng - this.lng0);
      xy.x = rho * Math.sin(theta);
      xy.y = _sphRho0 - rho * Math.cos(theta);
    }
  };

  this.inverse = function(x, y, ll) {
    if (!this.spherical) {
      this.inverseEllApprox(x, y, ll);
    } else {
      var rho0 = _sphRho0;
      var rho = Math.sqrt(x * x + (rho0 - y) * (rho0 - y));
      if (_sphN < 0) {
        rho = -rho;
      }
      var theta = Math.atan(x / (rho0 - y));
      ll.lat = 2 * Math.atan(Math.pow(_sphF /
        rho, 1 / _sphN)) - 0.5 * Math.PI;
      ll.lng = theta / _sphN + this.lng0;
    }
  };
}

function calcLambertT(lat, e) {
  var sinLat = Math.sin(lat);
  return Math.tan(Math.PI / 4 - lat / 2) /
    Math.pow((1 - e * sinLat) / (1 + e * sinLat), e / 2);
}

function calcLambertM(lat, e) {
  var sinLat = Math.sin(lat);
  return Math.cos(lat) / Math.sqrt(1 - e * e * sinLat * sinLat);
}

function WinkelTripel() {
  initProj(this, 'winkel_tripel');
  this.forward = function(lng, lat, xy) {
    var lat0 = 50.4670 * DEG2RAD;
    var a = Math.acos( Math.cos(lat) * Math.cos(lng * 0.5));
    var sincAlpha = a === 0 ? 1 : Math.sin( a ) / a;
    xy.x = 0.5 * (lng * Math.cos(lat0) + 2 * Math.cos(lat) * Math.sin(0.5 * lng) / sincAlpha);
    xy.y = 0.5 * (lat + Math.sin(lat) / sincAlpha);
  };
}

function Robinson() {
  initProj(this, 'robinson');
  var FXC = 0.8487;
  var FYC = 1.3523;
  var xx = [
    1, -5.67239e-12, -7.15511e-05, 3.11028e-06,
    0.9986, -0.000482241, -2.4897e-05, -1.33094e-06,
    0.9954, -0.000831031, -4.4861e-05, -9.86588e-07,
    0.99, -0.00135363, -5.96598e-05, 3.67749e-06,
    0.9822, -0.00167442, -4.4975e-06, -5.72394e-06,
    0.973, -0.00214869, -9.03565e-05, 1.88767e-08,
    0.96, -0.00305084, -9.00732e-05, 1.64869e-06,
    0.9427, -0.00382792, -6.53428e-05, -2.61493e-06,
    0.9216, -0.00467747, -0.000104566, 4.8122e-06,
    0.8962, -0.00536222, -3.23834e-05, -5.43445e-06,
    0.8679, -0.00609364, -0.0001139, 3.32521e-06,
    0.835, -0.00698325, -6.40219e-05, 9.34582e-07,
    0.7986, -0.00755337, -5.00038e-05, 9.35532e-07,
    0.7597, -0.00798325, -3.59716e-05, -2.27604e-06,
    0.7186, -0.00851366, -7.0112e-05, -8.63072e-06,
    0.6732, -0.00986209, -0.000199572, 1.91978e-05,
    0.6213, -0.010418, 8.83948e-05, 6.24031e-06,
    0.5722, -0.00906601, 0.000181999, 6.24033e-06,
    0.5322, 0,0,0
  ];
  var yy = [
    0, 0.0124, 3.72529e-10, 1.15484e-09,
    0.062, 0.0124001, 1.76951e-08, -5.92321e-09,
    0.124, 0.0123998, -7.09668e-08, 2.25753e-08,
    0.186, 0.0124008, 2.66917e-07, -8.44523e-08,
    0.248, 0.0123971, -9.99682e-07, 3.15569e-07,
    0.31, 0.0124108, 3.73349e-06, -1.1779e-06,
    0.372, 0.0123598, -1.3935e-05, 4.39588e-06,
    0.434, 0.0125501, 5.20034e-05, -1.00051e-05,
    0.4968, 0.0123198, -9.80735e-05, 9.22397e-06,
    0.5571, 0.0120308, 4.02857e-05, -5.2901e-06,
    0.6176, 0.0120369, -3.90662e-05, 7.36117e-07,
    0.6769, 0.0117015, -2.80246e-05, -8.54283e-07,
    0.7346, 0.0113572, -4.08389e-05, -5.18524e-07,
    0.7903, 0.0109099, -4.86169e-05, -1.0718e-06,
    0.8435, 0.0103433, -6.46934e-05, 5.36384e-09,
    0.8936, 0.00969679, -6.46129e-05, -8.54894e-06,
    0.9394, 0.00840949, -0.000192847, -4.21023e-06,
    0.9761, 0.00616525, -0.000256001, -4.21021e-06,
    1,0,0,0
  ];
  this.forward = function(lng, lat, xy) {
    var absLat = Math.abs(lat),
        j = Math.min(Math.floor(absLat * 11.45915590261646417544), 17),
        dphi = (absLat - 0.08726646259971647884 * j) / DEG2RAD,
        sign = lat < 0 ? -1 : 1,
        i = j * 4;
    xy.x = (((dphi * xx[i+3] + xx[i+2]) * dphi + xx[i+1]) * dphi + xx[i]) * lng * FXC;
    xy.y = (((dphi * yy[i+3] + yy[i+2]) * dphi + yy[i+1]) * dphi + yy[i]) * FYC * sign;
  };
}

// A compound projection, consisting of a default projection and one or more rectangular frames
// that are reprojected and/or affine transformed.
// @proj Default projection.
function MixedProjection(proj) {
  var frames = [];
  // @proj2 projection to use.
  // @ctr1 {lat, lng} center of the frame contents.
  // @ctr2 {lat, lng} geo location to move the frame center
  // @frameWidth Width of the frame in base projection units
  // @frameHeight Height of the frame in base projection units
  // @scale Scale factor; 1 = no scaling.
  // @rotation Rotation in degrees; 0 = no rotation.
  this.addFrame = function(proj2, ctr1, ctr2, frameWidth, frameHeight, scale, rotation) {
    var xy1 = proj.projectLatLng(ctr1.lat, ctr1.lng);
    var xy2 = proj.projectLatLng(ctr2.lat, ctr2.lng);
    var bbox = [xy1.x - frameWidth * 0.5, xy1.y - frameHeight * 0.5, xy1.x + frameWidth * 0.5, xy1.y + frameHeight * 0.5];
    var m = new Matrix2D();
    m.rotate(rotation * DEG2RAD, xy1.x, xy1.y );
    m.scale(scale, scale);
    m.transformXY(xy1.x, xy1.y, xy1);
    m.translate(xy2.x - xy1.x, xy2.y - xy1.y);
    frames.push({
      bbox: bbox,
      matrix: m,
      projection: proj2
    });
    return this;
  };

  this.projectLatLng = function(lat, lng, xy) {
    var frame, bbox;
    xy = proj.projectLatLng(lat, lng, xy);
    for (var i=0, n=frames.length; i<n; i++) {
      frame = frames[i];
      bbox = frame.bbox;
      if (xy.x >= bbox[0] && xy.x <= bbox[2] && xy.y >= bbox[1] && xy.y <= bbox[3]) {
        frame.projection.projectLatLng(lat, lng, xy);
        frame.matrix.transformXY(xy.x, xy.y, xy);
        break;
      }
    }
    return xy;
  };

  // TODO: implement inverse projection for frames
  this.unprojectXY = function(x, y, ll) {
    return proj.unprojectXY.call(proj, x, y, ll);
  };
}

// A matrix class that supports affine transformations (scaling, translation, rotation).
// Elements:
//   a  c  tx
//   b  d  ty
//   0  0  1  (u v w are not used)
//
function Matrix2D() {
  this.a = 1;
  this.c = 0;
  this.tx = 0;
  this.b = 0;
  this.d = 1;
  this.ty = 0;
}

Matrix2D.prototype.transformXY = function(x, y, p) {
  p = p || {};
  p.x = x * this.a + y * this.c + this.tx;
  p.y = x * this.b + y * this.d + this.ty;
  return p;
};

Matrix2D.prototype.translate = function(dx, dy) {
  this.tx += dx;
  this.ty += dy;
};

Matrix2D.prototype.rotate = function(q, x, y) {
  var cos = Math.cos(q);
  var sin = Math.sin(q);
  x = x || 0;
  y = y || 0;
  this.a = cos;
  this.c = -sin;
  this.b = sin;
  this.d = cos;
  this.tx += x - x * cos + y * sin;
  this.ty += y - x * sin - y * cos;
};

Matrix2D.prototype.scale = function(sx, sy) {
  this.a *= sx;
  this.c *= sx;
  this.b *= sy;
  this.d *= sy;
};




MapShaper.editArcs = function(arcs, onPoint) {
  var nn2 = [],
      xx2 = [],
      yy2 = [],
      n;

  arcs.forEach(function(arc, i) {
    editArc(arc, onPoint);
  });
  arcs.updateVertexData(nn2, xx2, yy2);

  function append(p) {
    xx2.push(p.x);
    yy2.push(p.y);
    n++;
  }

  function editArc(arc, cb) {
    var x, y, xp, yp;
    var i = 0;
    n = 0;
    while (arc.hasNext()) {
      x = arc.x;
      y = arc.y;
      cb(append, x, y, xp, yp, i++);
      xp = x;
      yp = y;
    }
    if (n == 1) { // invalid arc len
      error("An invalid arc was created");
    }
    nn2.push(n);
  }
};




api.proj = function(dataset, opts) {
  var proj = MapShaper.getProjection(opts.projection, opts);
  if (!proj) {
    stop("[proj] Unknown projection:", opts.projection);
  }
  MapShaper.projectDataset(dataset, proj, opts);
};

MapShaper.getProjection = function(name, opts) {
  var f = MapShaper.projectionIndex[name.toLowerCase().replace(/-_ /g, '')];
  return f ? new f(opts) : null;
};

MapShaper.printProjections = function() {
  var names = Object.keys(MapShaper.projectionIndex);
  names.sort();
  names.forEach(function(n) {
    message(n);
  });
};

MapShaper.projectDataset = function(dataset, proj, opts) {
  dataset.layers.forEach(function(lyr) {
    if (MapShaper.layerHasPoints(lyr)) {
      MapShaper.projectPointLayer(lyr, proj);
    }
  });
  if (dataset.arcs) {
    if (opts.densify) {
      MapShaper.projectAndDensifyArcs(dataset.arcs, proj);
    } else {
      MapShaper.projectArcs(dataset.arcs, proj);
    }
  }
  if (dataset.info) {
    // Setting output crs to null: "If the value of CRS is null, no CRS can be assumed"
    // (by default, GeoJSON assumes WGS84)
    // source: http://geojson.org/geojson-spec.html#coordinate-reference-system-objects
    // TODO: create a valid GeoJSON crs object after projecting
    dataset.info.output_crs = null;
    dataset.info.output_prj = null;
  }
};

MapShaper.projectPointLayer = function(lyr, proj) {
  var xy = {x: 0, y: 0};
  MapShaper.forEachPoint(lyr.shapes, function(p) {
    proj.projectLatLng(p[1], p[0], xy);
    p[0] = xy.x;
    p[1] = xy.y;
  });
};

MapShaper.projectArcs = function(arcs, proj) {
  var data = arcs.getVertexData(),
      xx = data.xx,
      yy = data.yy,
      // old zz will not be optimal after reprojection; re-using it for now
      // to avoid error in web ui
      zz = data.zz,
      p = {x: 0, y: 0};
  if (arcs.isPlanar()) {
    stop("[proj] Only projection from lat-lng coordinates is supported");
  }
  for (var i=0, n=xx.length; i<n; i++) {
    proj.projectLatLng(yy[i], xx[i], p);
    xx[i] = p.x;
    yy[i] = p.y;
  }
  arcs.updateVertexData(data.nn, xx, yy, zz);
};

MapShaper.getDefaultDensifyInterval = function(arcs, proj) {
  var xy = MapShaper.getAvgSegment2(arcs),
      bb = arcs.getBounds(),
      a = proj.projectLatLng(bb.centerY(), bb.centerX()),
      b = proj.projectLatLng(bb.centerY() + xy[1], bb.centerX());
  return distance2D(a.x, a.y, b.x, b.y);
};

// Interpolate points into a projected line segment if needed to prevent large
//   deviations from path of original unprojected segment.
// @points (optional) array of accumulated points
MapShaper.densifySegment = function(lng0, lat0, x0, y0, lng2, lat2, x2, y2, proj, interval, points) {
  // Find midpoint between two endpoints and project it (assumes longitude does
  // not wrap). TODO Consider bisecting along great circle path -- although this
  // would not be good for boundaries that follow line of constant latitude.
  var lng1 = (lng0 + lng2) / 2,
      lat1 = (lat0 + lat2) / 2,
      p = proj.projectLatLng(lat1, lng1),
      distSq = geom.pointSegDistSq(p.x, p.y, x0, y0, x2, y2); // sq displacement
  points = points || [];
  // Bisect current segment if the projected midpoint deviates from original
  //   segment by more than the @interval parameter.
  //   ... but don't bisect very small segments to prevent infinite recursion
  //   (e.g. if projection function is discontinuous)
  if (distSq > interval * interval && distance2D(lng0, lat0, lng2, lat2) > 0.01) {
    MapShaper.densifySegment(lng0, lat0, x0, y0, lng1, lat1, p.x, p.y, proj, interval, points);
    points.push(p);
    MapShaper.densifySegment(lng1, lat1, p.x, p.y, lng2, lat2, x2, y2, proj, interval, points);
  }
  return points;
};

MapShaper.projectAndDensifyArcs = function(arcs, proj) {
  var interval = MapShaper.getDefaultDensifyInterval(arcs, proj);
  var tmp = {x: 0, y: 0};
  MapShaper.editArcs(arcs, onPoint);

  function onPoint(append, lng, lat, prevLng, prevLat, i) {
    var p = tmp,
        prevX = p.x,
        prevY = p.y;
    proj.projectLatLng(lat, lng, p);
    // Try to densify longer segments (optimization)
    if (i > 0 && distanceSq(p.x, p.y, prevX, prevY) > interval * interval * 25) {
      MapShaper.densifySegment(prevLng, prevLat, prevX, prevY, lng, lat, p.x, p.y, proj, interval)
        .forEach(append);
    }
    append(p);
  }
};




api.renameLayers = function(layers, names) {
  var nameCount = names && names.length || 0;
  layers.forEach(function(lyr, i) {
    var name;
    if (nameCount === 0) {
      name = "layer" + (i + 1);
    } else {
      name = i < nameCount - 1 ? names[i] : names[nameCount - 1];
      if (nameCount < layers.length && i >= nameCount - 2) {
        name += i - nameCount + 2;
      }
    }
    lyr.name = name;
  });
};




// A minheap data structure used for computing Visvalingam simplification data.
//
function Heap() {
  var heapBuf = utils.expandoBuffer(Int32Array),
      indexBuf = utils.expandoBuffer(Int32Array),
      itemsInHeap = 0,
      dataArr,
      heapArr,
      indexArr;

  this.init = function(values) {
    var i;
    dataArr = values;
    itemsInHeap = values.length;
    heapArr = heapBuf(itemsInHeap);
    indexArr = indexBuf(itemsInHeap);
    for (i=0; i<itemsInHeap; i++) {
      insertValue(i, i);
    }
    // place non-leaf items
    for (i=(itemsInHeap-2) >> 1; i >= 0; i--) {
      downHeap(i);
    }
  };

  this.size = function() {
    return itemsInHeap;
  };

  // Update a single value and re-heap
  this.updateValue = function(valIdx, val) {
    var heapIdx = indexArr[valIdx];
    dataArr[valIdx] = val;
    if (!(heapIdx >= 0 && heapIdx < itemsInHeap)) {
      error("Out-of-range heap index.");
    }
    downHeap(upHeap(heapIdx));
  };

  this.popValue = function() {
    return dataArr[this.pop()];
  };

  // Return the idx of the lowest-value item in the heap
  this.pop = function() {
    var popIdx;
    if (itemsInHeap <= 0) {
      error("Tried to pop from an empty heap.");
    }
    popIdx = heapArr[0];
    insertValue(0, heapArr[--itemsInHeap]); // move last item in heap into root position
    downHeap(0);
    return popIdx;
  };

  function upHeap(idx) {
    var parentIdx;
    // Move item up in the heap until it's at the top or is not lighter than its parent
    while (idx > 0) {
      parentIdx = (idx - 1) >> 1;
      if (greaterThan(idx, parentIdx)) {
        break;
      }
      swapItems(idx, parentIdx);
      idx = parentIdx;
    }
    return idx;
  }

  // Swap item at @idx with any lighter children
  function downHeap(idx) {
    var minIdx = compareDown(idx);

    while (minIdx > idx) {
      swapItems(idx, minIdx);
      idx = minIdx; // descend in the heap
      minIdx = compareDown(idx);
    }
  }

  function swapItems(a, b) {
    var i = heapArr[a];
    insertValue(a, heapArr[b]);
    insertValue(b, i);
  }

  // Associate a heap idx with the index of a value in data arr
  function insertValue(heapIdx, valId) {
    indexArr[valId] = heapIdx;
    heapArr[heapIdx] = valId;
  }

  // @a, @b: Indexes in @heapArr
  function greaterThan(a, b) {
    var idx1 = heapArr[a],
        idx2 = heapArr[b],
        val1 = dataArr[idx1],
        val2 = dataArr[idx2];
    // If values are equal, compare array indexes.
    // This is not a requirement of the Visvalingam algorithm,
    // but it generates output that matches Mahes Visvalingam's
    // reference implementation.
    // See https://hydra.hull.ac.uk/assets/hull:10874/content
    return (val1 > val2 || val1 === val2 && idx1 > idx2);
  }

  function compareDown(idx) {
    var a = 2 * idx + 1,
        b = a + 1,
        n = itemsInHeap;
    if (a < n && greaterThan(idx, a)) {
      idx = a;
    }
    if (b < n && greaterThan(idx, b)) {
      idx = b;
    }
    return idx;
  }
}




var Visvalingam = {};

Visvalingam.getArcCalculator = function(metric, is3D) {
  var heap = new Heap(),
      prevBuf = utils.expandoBuffer(Int32Array),
      nextBuf = utils.expandoBuffer(Int32Array),
      calc = is3D ?
        function(b, c, d, xx, yy, zz) {
          return metric(xx[b], yy[b], zz[b], xx[c], yy[c], zz[c], xx[d], yy[d], zz[d]);
        } :
        function(b, c, d, xx, yy) {
          return metric(xx[b], yy[b], xx[c], yy[c], xx[d], yy[d]);
        };

  // Calculate Visvalingam simplification data for an arc
  // @kk (Float64Array|Array) Receives calculated simplification thresholds
  // @xx, @yy, (@zz) Buffers containing vertex coordinates
  return function calcVisvalingam(kk, xx, yy, zz) {
    var arcLen = kk.length,
        prevArr = prevBuf(arcLen),
        nextArr = nextBuf(arcLen),
        val, maxVal = -Infinity,
        b, c, d; // indexes of points along arc

    if (zz && !is3D) {
      error("[visvalingam] Received z-axis data for 2D simplification");
    } else if (!zz && is3D) {
      error("[visvalingam] Missing z-axis data for 3D simplification");
    } else if (kk.length > xx.length) {
      error("[visvalingam] Incompatible data arrays:", kk.length, xx.length);
    }

    // Initialize Visvalingam "effective area" values and references to
    //   prev/next points for each point in arc.
    for (c=0; c<arcLen; c++) {
      b = c-1;
      d = c+1;
      if (b < 0 || d >= arcLen) {
        val = Infinity; // endpoint maxVals
      } else {
        val = calc(b, c, d, xx, yy, zz);
      }
      kk[c] = val;
      nextArr[c] = d;
      prevArr[c] = b;
    }
    heap.init(kk);

    // Calculate removal thresholds for each internal point in the arc
    //
    while (heap.size() > 0) {
      c = heap.pop(); // Remove the point with the least effective area.
      val = kk[c];
      if (val === Infinity) {
        break;
      }
      if (val < maxVal) {
        // don't assign current point a lesser value than the last removed vertex
        kk[c] = maxVal;
      } else {
        maxVal = val;
      }

      // Recompute effective area of neighbors of the removed point.
      b = prevArr[c];
      d = nextArr[c];
      if (b > 0) {
        val = calc(prevArr[b], b, d, xx, yy, zz);
        heap.updateValue(b, val);
      }
      if (d < arcLen-1) {
        val = calc(b, d, nextArr[d], xx, yy, zz);
        heap.updateValue(d, val);
      }
      nextArr[b] = d;
      prevArr[d] = b;
    }
  };
};

Visvalingam.standardMetric = triangleArea;
Visvalingam.standardMetric3D = triangleArea3D;

Visvalingam.getWeightedMetric = function(opts) {
  var weight = Visvalingam.getWeightFunction(opts);
  return function(ax, ay, bx, by, cx, cy) {
    var area = triangleArea(ax, ay, bx, by, cx, cy),
        cos = cosine(ax, ay, bx, by, cx, cy);
    return weight(cos) * area;
  };
};

Visvalingam.getWeightedMetric3D = function(opts) {
  var weight = Visvalingam.getWeightFunction(opts);
  return function(ax, ay, az, bx, by, bz, cx, cy, cz) {
    var area = triangleArea3D(ax, ay, az, bx, by, bz, cx, cy, cz),
        cos = cosine3D(ax, ay, az, bx, by, bz, cx, cy, cz);
    return weight(cos) * area;
  };
};

Visvalingam.getWeightCoefficient = function(opts) {
  return opts && utils.isNumber(opts && opts.weighting) ? opts.weighting : 0.7;
};

// Get a parameterized version of Visvalingam.weight()
Visvalingam.getWeightFunction = function(opts) {
  var k = Visvalingam.getWeightCoefficient(opts);
  return function(cos) {
    return -cos * k + 1;
  };
};

// Weight triangle area by inverse cosine
// Standard weighting favors 90-deg angles; this curve peaks at 120 deg.
Visvalingam.weight = function(cos) {
  var k = 0.7;
  return -cos * k + 1;
};

Visvalingam.getEffectiveAreaSimplifier = function(use3D) {
  var metric = use3D ? Visvalingam.standardMetric3D : Visvalingam.standardMetric;
  return Visvalingam.getPathSimplifier(metric, use3D);
};

Visvalingam.getWeightedSimplifier = function(opts, use3D) {
  var metric = use3D ? Visvalingam.getWeightedMetric3D(opts) : Visvalingam.getWeightedMetric(opts);
  return Visvalingam.getPathSimplifier(metric, use3D);
};

Visvalingam.getPathSimplifier = function(metric, use3D) {
  return Visvalingam.scaledSimplify(Visvalingam.getArcCalculator(metric, use3D));
};


Visvalingam.scaledSimplify = function(f) {
  return function(kk, xx, yy, zz) {
    f(kk, xx, yy, zz);
    for (var i=1, n=kk.length - 1; i<n; i++) {
      // convert area metric to a linear equivalent
      kk[i] = Math.sqrt(kk[i]) * 0.65;
    }
  };
};




var DouglasPeucker = {};

DouglasPeucker.metricSq3D = geom.pointSegDistSq3D;
DouglasPeucker.metricSq = geom.pointSegDistSq;

// @dest array to contain point removal thresholds
// @xx, @yy arrays of x, y coords of a path
// @zz (optional) array of z coords for spherical simplification
//
DouglasPeucker.calcArcData = function(dest, xx, yy, zz) {
  var len = dest.length,
      useZ = !!zz;

  dest[0] = dest[len-1] = Infinity;
  if (len > 2) {
    procSegment(0, len-1, 1, Number.MAX_VALUE);
  }

  function procSegment(startIdx, endIdx, depth, distSqPrev) {
    // get endpoint coords
    var ax = xx[startIdx],
        ay = yy[startIdx],
        cx = xx[endIdx],
        cy = yy[endIdx],
        az, cz;
    if (useZ) {
      az = zz[startIdx];
      cz = zz[endIdx];
    }

    var maxDistSq = 0,
        maxIdx = 0,
        distSqLeft = 0,
        distSqRight = 0,
        distSq;

    for (var i=startIdx+1; i<endIdx; i++) {
      if (useZ) {
        distSq = DouglasPeucker.metricSq3D(xx[i], yy[i], zz[i], ax, ay, az, cx, cy, cz);
      } else {
        distSq = DouglasPeucker.metricSq(xx[i], yy[i], ax, ay, cx, cy);
      }

      if (distSq >= maxDistSq) {
        maxDistSq = distSq;
        maxIdx = i;
      }
    }

    // Case -- threshold of parent segment is less than threshold of curr segment
    // Curr max point is assigned parent's threshold, so parent is not removed
    // before child as simplification is increased.
    //
    if (distSqPrev < maxDistSq) {
      maxDistSq = distSqPrev;
    }

    if (maxIdx - startIdx > 1) {
      distSqLeft = procSegment(startIdx, maxIdx, depth+1, maxDistSq);
    }
    if (endIdx - maxIdx > 1) {
      distSqRight = procSegment(maxIdx, endIdx, depth+1, maxDistSq);
    }

    // Case -- max point of curr segment is highest-threshold point of an island polygon
    // Give point the same threshold as the next-highest point, to prevent
    // a 3-vertex degenerate ring.
    if (depth == 1 && ax == cx && ay == cy) {
      maxDistSq = Math.max(distSqLeft, distSqRight);
    }

    dest[maxIdx] =  Math.sqrt(maxDistSq);
    return maxDistSq;
  }
};




// Combine detection and repair for cli
//
api.findAndRepairIntersections = function(arcs) {
  T.start();
  var intersections = MapShaper.findSegmentIntersections(arcs),
      unfixable = MapShaper.repairIntersections(arcs, intersections),
      countPre = intersections.length,
      countPost = unfixable.length,
      countFixed = countPre > countPost ? countPre - countPost : 0,
      msg;
  T.stop('Find and repair intersections');
  if (countPre > 0) {
    msg = utils.format("[simplify] Repaired %'i intersection%s", countFixed,
        utils.pluralSuffix(countFixed));
    if (countPost > 0) {
      msg += utils.format("; %'i intersection%s could not be repaired", countPost,
          utils.pluralSuffix(countPost));
    }
    message(msg);
  }
};

// Try to resolve a collection of line-segment intersections by rolling
// back simplification along intersecting segments.
//
// Limitation of this method: it can't remove intersections that are present
// in the original dataset.
//
// @arcs ArcCollection object
// @intersections (Array) Output from MapShaper.findSegmentIntersections()
// Returns array of unresolved intersections, or empty array if none.
//
MapShaper.repairIntersections = function(arcs, intersections) {
  while (MapShaper.unwindIntersections(arcs, intersections) > 0) {
    intersections = MapShaper.findSegmentIntersections(arcs);
  }
  return intersections;
};

MapShaper.unwindIntersections = function(arcs, intersections) {
  var data = arcs.getVertexData(),
      zlim = arcs.getRetainedInterval(),
      changes = 0,
      loops = 0,
      replacements, queue, target, i;

  // create a queue of unwind targets
  queue = MapShaper.getUnwindTargets(intersections, zlim, data.zz);
  utils.sortOn(queue, 'z', !!"ascending");

  while (queue.length > 0) {
    target = queue.pop();
    // redetect unwind target, in case a previous unwind operation has changed things
    // TODO: don't redetect if target couldn't have been affected
    replacements = MapShaper.redetectIntersectionTarget(target, zlim, data.xx, data.yy, data.zz);
    if (replacements.length == 1) {
      replacements = MapShaper.unwindIntersection(replacements[0], zlim, data.zz);
      changes++;
    } else  {
      // either 0 or multiple intersections detected
    }

    for (i=0; i<replacements.length; i++) {
      MapShaper.insertUnwindTarget(queue, replacements[i]);
    }
  }
  if (++loops > 500000) {
    verbose("Caught an infinite loop at intersection:", target);
    return 0;
  }
  return changes;
};

MapShaper.getUnwindTargets = function(intersections, zlim, zz) {
  return intersections.reduce(function(memo, o) {
    var target = MapShaper.getUnwindTarget(o, zlim, zz);
    if (target !== null) {
      memo.push(target);
    }
    return memo;
  }, []);
};

// @o an intersection object
// returns null if no vertices can be added along both segments
// else returns an object with properties:
//   a: intersecting segment to be partitioned
//   b: intersecting segment to be retained
//   z: threshold value of one or more points along [a] to be re-added
MapShaper.getUnwindTarget = function(o, zlim, zz) {
  var ai = MapShaper.findNextRemovableVertex(zz, zlim, o.a[0], o.a[1]),
      bi = MapShaper.findNextRemovableVertex(zz, zlim, o.b[0], o.b[1]),
      targ;
  if (ai == -1 && bi == -1) {
    targ = null;
  } else if (bi == -1 || ai != -1 && zz[ai] > zz[bi]) {
    targ = {
      a: o.a,
      b: o.b,
      z: zz[ai]
    };
  } else {
    targ = {
      a: o.b,
      b: o.a,
      z: zz[bi]
    };
  }
  return targ;
};

// Insert an intersection into sorted position
MapShaper.insertUnwindTarget = function(arr, obj) {
  var ins = arr.length;
  while (ins > 0) {
    if (arr[ins-1].z <= obj.z) {
      break;
    }
    arr[ins] = arr[ins-1];
    ins--;
  }
  arr[ins] = obj;
};

// Partition one of two intersecting segments by setting the removal threshold
// of vertices indicated by @target equal to @zlim (the current simplification
// level of the ArcCollection)
MapShaper.unwindIntersection = function(target, zlim, zz) {
  var replacements = [];
  var start = target.a[0],
      end = target.a[1],
      z = target.z;
  for (var i = start + 1; i <= end; i++) {
    if (zz[i] == z || i == end) {
      replacements.push({
        a: [start, i],
        b: target.b,
        z: z
      });
      if (i != end) zz[i] = zlim;
      start = i;
    }
  }
  if (replacements.length < 2) error("Error in unwindIntersection()");
  return replacements;
};

MapShaper.redetectIntersectionTarget = function(targ, zlim, xx, yy, zz) {
  var segIds = MapShaper.getIntersectionCandidates(targ, zlim, xx, yy, zz);
  var intersections = MapShaper.intersectSegments(segIds, xx, yy);
  return MapShaper.getUnwindTargets(intersections, zlim, zz);
};

MapShaper.getIntersectionCandidates = function(o, zlim, xx, yy, zz) {
  var segIds = MapShaper.getSegmentVertices(o.a, zlim, xx, yy, zz);
  segIds = segIds.concat(MapShaper.getSegmentVertices(o.b, zlim, xx, yy, zz));
  return segIds;
};

// Get all segments defined by two endpoints and the vertices between
// them that are at or above the current simplification threshold.
// TODO: test intersections with identical start + end ids
MapShaper.getSegmentVertices = function(seg, zlim, xx, yy, zz) {
  var start, end, prev, ids = [];
  if (seg[0] <= seg[1]) {
    start = seg[0];
    end = seg[1];
  } else {
    start = seg[1];
    end = seg[0];
  }
  prev = start;
  for (var i=start+1; i<=end; i++) {
    if (zz[i] >= zlim) {
      if (xx[prev] < xx[i]) {
        ids.push(prev, i);
      } else {
        ids.push(i, prev);
      }
      prev = i;
    }
  }
  return ids;
};




MapShaper.calcSimplifyStats = function(arcs, use3D) {
  var distSq = use3D ? pointSegGeoDistSq : geom.pointSegDistSq,
      calcAngle = use3D ? geom.signedAngleSph : geom.signedAngle,
      removed = 0,
      retained = 0,
      collapsedRings = 0,
      max = 0,
      sum = 0,
      sumSq = 0,
      iprev = -1,
      jprev = -1,
      measures = [],
      angles = [],
      zz = arcs.getVertexData().zz,
      count, stats;

  arcs.forEachSegment(function(i, j, xx, yy) {
    var ax, ay, bx, by, d2, d, skipped, angle, tmp;
    ax = xx[i];
    ay = yy[i];
    bx = xx[j];
    by = yy[j];

    if (i == jprev) {
      angle = calcAngle(xx[iprev], yy[iprev], ax, ay, bx, by);
      if (angle > Math.PI) angle = 2 * Math.PI - angle;
      if (!isNaN(angle)) {
        angles.push(angle * 180 / Math.PI);
      }
    }
    iprev = i;
    jprev = j;

    if (zz[i] < Infinity) {
      retained++;
    }
    skipped = j - i - 1;
    if (skipped < 1) return;
    removed += skipped;

    if (ax == bx && ay == by) {
      collapsedRings++;
    } else {
      d2 = 0;
      while (++i < j) {
        tmp = distSq(xx[i], yy[i], ax, ay, bx, by);
        d2 = Math.max(d2, tmp);
      }
      sumSq += d2;
      d = Math.sqrt(d2);
      sum += d;
      measures.push(d);
      max = Math.max(max, d);
    }
  });

  function pointSegGeoDistSq(alng, alat, blng, blat, clng, clat) {
    var xx = [], yy = [], zz = [];
    geom.convLngLatToSph([alng, blng, clng], [alat, blat, clat], xx, yy, zz);
    return geom.pointSegDistSq3D(xx[0], yy[0], zz[0], xx[1], yy[1], zz[1],
          xx[2], yy[2], zz[2]);
  }

  stats = {
    angleMean: 0,
    displacementMean: 0,
    displacementMax: max,
    collapsedRings: collapsedRings,
    removed: removed,
    retained: retained,
    uniqueCount: MapShaper.countUniqueVertices(arcs),
    removableCount: removed + retained
  };

  if (angles.length > 0) {
    // stats.medianAngle = utils.findMedian(angles);
    stats.angleMean = utils.sum(angles) / angles.length;
    // stats.lt30 = utils.findRankByValue(angles, 30) / angles.length * 100;
    // stats.lt45 = utils.findRankByValue(angles, 45) / angles.length * 100;
    // stats.lt60 = utils.findRankByValue(angles, 60) / angles.length * 100;
    // stats.lt90 = utils.findRankByValue(angles, 90) / angles.length * 100;
    // stats.lt120 = utils.findRankByValue(angles, 120) / angles.length * 100;
    // stats.lt135 = utils.findRankByValue(angles, 135) / angles.length * 100;
    stats.angleQuartiles = [
      utils.findValueByPct(angles, 0.75),
      utils.findValueByPct(angles, 0.5),
      utils.findValueByPct(angles, 0.25)
    ];
  }

  if (measures.length > 0) {
    stats.displacementMean = sum / measures.length;
    // stats.median = utils.findMedian(measures);
    // stats.stdDev = Math.sqrt(sumSq / measures.length);
    stats.displacementQuartiles = [
      utils.findValueByPct(measures, 0.75),
      utils.findValueByPct(measures, 0.5),
      utils.findValueByPct(measures, 0.25)
    ];
  }
  return stats;
};

MapShaper.countUniqueVertices = function(arcs) {
  // TODO: exclude any zero-length arcs
  var endpoints = arcs.size() * 2;
  var nodes = new NodeCollection(arcs).size();
  return arcs.getPointCount() - endpoints + nodes;
};





MapShaper.getSimplifyMethodLabel = function(slug) {
  return {
    dp: "Ramer-Douglas-Peucker",
    visvalingam: "Visvalingam",
    weighted_visvalingam: "Weighted Visvalingam"
  }[slug] || "Unknown";
};

MapShaper.printSimplifyInfo = function(arcs, opts) {
  var method = MapShaper.getSimplifyMethod(opts);
  var name = MapShaper.getSimplifyMethodLabel(method);
  var spherical = MapShaper.useSphericalSimplify(arcs, opts);
  var stats = MapShaper.calcSimplifyStats(arcs, spherical);
  var pct1 = (stats.removed + stats.collapsedRings) / stats.uniqueCount || 0;
  var pct2 = stats.removed / stats.removableCount || 0;
  var aq = stats.angleQuartiles;
  var dq = stats.displacementQuartiles;
  var lines = ["Simplification statistics"];
  lines.push(utils.format("Method: %s (%s) %s", name, spherical ? 'spherical' : 'planar',
      method == 'weighted_visvalingam' ? '(weighting=' + Visvalingam.getWeightCoefficient(opts) + ')' : ''));
  lines.push(utils.format("Removed vertices: %,d", stats.removed + stats.collapsedRings));
  lines.push(utils.format("   %.1f% of %,d unique coordinate locations", pct1 * 100, stats.uniqueCount));
  lines.push(utils.format("   %.1f% of %,d filterable coordinate locations", pct2 * 100, stats.removableCount));
  lines.push(utils.format("Simplification threshold: %.4f %s", arcs.getRetainedInterval(),
      spherical ? 'meters' : ''));
  lines.push(utils.format("Collapsed rings: %,d", stats.collapsedRings));
  lines.push("Displacement statistics");
  lines.push(utils.format("   Mean displacement: %.4f", stats.displacementMean));
  lines.push(utils.format("   Max displacement: %.4f", stats.displacementMax));
  lines.push(utils.format("   Quartiles: %.2f, %.2f, %.2f", dq[0], dq[1], dq[2]));
  lines.push("Vertex angle statistics");
  lines.push(utils.format("   Mean angle: %.2f degrees", stats.angleMean));
  // lines.push(utils.format("   Angles < 45: %.2f%", stats.lt45));
  lines.push(utils.format("   Quartiles: %.2f, %.2f, %.2f", aq[0], aq[1], aq[2]));

  message(lines.join('\n   '));
};




api.simplify = function(dataset, opts) {
  var arcs = dataset.arcs;
  if (!arcs) stop("[simplify] Missing path data");
  // standardize options
  opts = MapShaper.getStandardSimplifyOpts(dataset, opts);
  // stash simplifcation options (used by gui settings dialog)
  dataset.info = utils.defaults({simplify: opts}, dataset.info);

  T.start();
  MapShaper.simplifyPaths(arcs, opts);

  if (utils.isNumber(opts.pct)) {
    arcs.setRetainedPct(opts.pct);
  } else if (utils.isNumber(opts.interval)) {
    arcs.setRetainedInterval(opts.interval);
  } else if (opts.resolution) {
    arcs.setRetainedInterval(MapShaper.calcSimplifyInterval(arcs, opts));
  }
  T.stop("Calculate simplification");

  if (opts.keep_shapes) {
    api.keepEveryPolygon(arcs, dataset.layers);
  }

  if (!opts.no_repair && arcs.getRetainedInterval() > 0) {
    api.findAndRepairIntersections(arcs);
  }

  if (opts.stats) {
    MapShaper.printSimplifyInfo(arcs, opts);
  }
};

MapShaper.getStandardSimplifyOpts = function(dataset, opts) {
  opts = opts || {};
  return utils.defaults({
    method: MapShaper.getSimplifyMethod(opts),
    spherical: MapShaper.useSphericalSimplify(dataset.arcs, opts)
  }, opts);
};

MapShaper.useSphericalSimplify = function(arcs, opts) {
  return !opts.planar && !arcs.isPlanar();
};

// Calculate simplification thresholds for each vertex of an arc collection
// (modifies @arcs ArcCollection in-place)
MapShaper.simplifyPaths = function(arcs, opts) {
  var simplifyPath = MapShaper.getSimplifyFunction(opts);
  arcs.setThresholds(new Float64Array(arcs.getPointCount())); // Create array to hold simplification data
  if (opts.spherical) {
    MapShaper.simplifyPaths3D(arcs, simplifyPath);
    MapShaper.protectWorldEdges(arcs);
  } else {
    MapShaper.simplifyPaths2D(arcs, simplifyPath);
  }
};

MapShaper.simplifyPaths2D = function(arcs, simplify) {
  arcs.forEach3(function(xx, yy, kk, i) {
    simplify(kk, xx, yy);
  });
};

MapShaper.simplifyPaths3D = function(arcs, simplify) {
  var xbuf = utils.expandoBuffer(Float64Array),
      ybuf = utils.expandoBuffer(Float64Array),
      zbuf = utils.expandoBuffer(Float64Array);
  arcs.forEach3(function(xx, yy, kk, i) {
    var n = xx.length,
        xx2 = xbuf(n),
        yy2 = ybuf(n),
        zz2 = zbuf(n);
    geom.convLngLatToSph(xx, yy, xx2, yy2, zz2);
    simplify(kk, xx2, yy2, zz2);
  });
};

MapShaper.getSimplifyMethod = function(opts) {
  var m = opts.method;
  if (!m || m == 'weighted' || m == 'visvalingam' && opts.weighting) {
    m =  'weighted_visvalingam';
  }
  return m;
};


MapShaper.getSimplifyFunction = function(opts) {
  var f;
  if (opts.method == 'dp') {
    f = DouglasPeucker.calcArcData;
  } else if (opts.method == 'visvalingam') {
    f = Visvalingam.getEffectiveAreaSimplifier(opts.spherical);
  } else if (opts.method == 'weighted_visvalingam') {
    f = Visvalingam.getWeightedSimplifier(opts, opts.spherical);
  } else {
    stop('[simplify] Unsupported simplify method:', method);
  }
  return f;
};

// Protect polar coordinates and coordinates at the prime meridian from
// being removed before other points in a path.
// Assume: coordinates are in decimal degrees
//
MapShaper.protectWorldEdges = function(arcs) {
  // Need to handle coords with rounding errors:
  // -179.99999999999994 in test/test_data/ne/ne_110m_admin_0_scale_rank.shp
  // 180.00000000000003 in ne/ne_50m_admin_0_countries.shp
  var bb1 = MapShaper.getWorldBounds(1e-12),
      bb2 = arcs.getBounds().toArray();
  if (containsBounds(bb1, bb2) === true) return; // return if content doesn't reach edges
  arcs.forEach3(function(xx, yy, zz) {
    var maxZ = 0,
    x, y;
    for (var i=0, n=zz.length; i<n; i++) {
      x = xx[i];
      y = yy[i];
      if (x > bb1[2] || x < bb1[0] || y < bb1[1] || y > bb1[3]) {
        if (maxZ === 0) {
          maxZ = MapShaper.findMaxThreshold(zz);
        }
        if (zz[i] !== Infinity) { // don't override lock value
          zz[i] = maxZ;
        }
      }
    }
  });
};

// Return largest value in an array, ignoring Infinity (lock value)
//
MapShaper.findMaxThreshold = function(zz) {
  var z, maxZ = 0;
  for (var i=0, n=zz.length; i<n; i++) {
    z = zz[i];
    if (z > maxZ && z < Infinity) {
      maxZ = z;
    }
  }
  return maxZ;
};

MapShaper.parseSimplifyResolution = function(raw) {
  var parts, w, h;
  if (utils.isNumber(raw)) {
    w = raw;
    h = raw;
  }
  else if (utils.isString(raw)) {
    parts = raw.split('x');
    w = Number(parts[0]) || 0;
    h = parts.length == 2 ? Number(parts[1]) || 0 : w;
  }
  if (!(w >= 0 && h >= 0 && w + h > 0)) {
    stop("Invalid simplify resolution:", raw);
  }
  return [w, h]; // TODO: validate;
};

MapShaper.calcPlanarInterval = function(xres, yres, width, height) {
  var fitWidth = xres !== 0 && width / height > xres / yres || yres === 0;
  return fitWidth ? width / xres : height / yres;
};

// Calculate a simplification interval for unprojected data, given an output resolution
// (This is approximate, since we don't know how the data will be projected for display)
MapShaper.calcSphericalInterval = function(xres, yres, bounds) {
  // Using length of arc along parallel through center of bbox as content width
  // TODO: consider using great circle instead of parallel arc to calculate width
  //    (doesn't work if width of bbox is greater than 180deg)
  var width = geom.degreesToMeters(bounds.width()) * Math.cos(bounds.centerY() * geom.D2R);
  var height = geom.degreesToMeters(bounds.height());
  return MapShaper.calcPlanarInterval(xres, yres, width, height);
};

MapShaper.calcSimplifyInterval = function(arcs, opts) {
  var res, interval, bounds;
  if (opts.interval) {
    interval = opts.interval;
  } else if (opts.resolution) {
    res = MapShaper.parseSimplifyResolution(opts.resolution);
    bounds = arcs.getBounds();
    if (MapShaper.useSphericalSimplify(arcs, opts)) {
      interval = MapShaper.calcSphericalInterval(res[0], res[1], bounds);
    } else {
      interval = MapShaper.calcPlanarInterval(res[0], res[1], bounds.width(), bounds.height());
    }
    // scale interval to double the resolution (single-pixel resolution creates
    //  visible artefacts)
    interval *= 0.5;
  }
  return interval;
};




api.splitLayer = function(src, splitField, opts) {
  var lyr0 = opts && opts.no_replace ? MapShaper.copyLayer(src) : src,
      properties = lyr0.data ? lyr0.data.getRecords() : null,
      shapes = lyr0.shapes,
      index = {},
      splitLayers = [],
      prefix;

  if (splitField && (!properties || !lyr0.data.fieldExists(splitField))) {
    stop("[split] Missing attribute field:", splitField);
  }

  // if not splitting on a field and layer is unnamed, name split-apart layers
  // like: split-0, split-1, ...
  prefix = lyr0.name || (splitField ? '' : 'split');

  utils.repeat(MapShaper.getFeatureCount(lyr0), function(i) {
    var key = String(splitField ? properties[i][splitField] : i + 1),
        lyr;

    if (key in index === false) {
      index[key] = splitLayers.length;
      lyr = utils.defaults({
        name: MapShaper.getSplitLayerName(prefix, key),
        data: properties ? new DataTable() : null,
        shapes: shapes ? [] : null
      }, lyr0);
      splitLayers.push(lyr);
    } else {
      lyr = splitLayers[index[key]];
    }
    if (shapes) {
      lyr.shapes.push(shapes[i]);
    }
    if (properties) {
      lyr.data.getRecords().push(properties[i]);
    }
  });
  return splitLayers;
};

MapShaper.getSplitLayerName = function(base, key) {
  return (base ? base + '-' : '') + key;
};




// Split the shapes in a layer according to a grid
// Return array of layers and an index with the bounding box of each cell
//
api.splitLayerOnGrid = function(lyr, arcs, rows, cols) {
  var shapes = lyr.shapes,
      bounds = arcs.getBounds(),
      xmin = bounds.xmin,
      ymin = bounds.ymin,
      w = bounds.width(),
      h = bounds.height(),
      properties = lyr.data ? lyr.data.getRecords() : null,
      groups = [];

  function groupId(shpBounds) {
    var c = Math.floor((shpBounds.centerX() - xmin) / w * cols),
        r = Math.floor((shpBounds.centerY() - ymin) / h * rows);
    c = utils.clamp(c, 0, cols-1);
    r = utils.clamp(r, 0, rows-1);
    return r * cols + c;
  }

  function groupName(i) {
    var c = i % cols + 1,
        r = Math.floor(i / cols) + 1;
    return "r" + r + "c" + c;
  }

  shapes.forEach(function(shp, i) {
    var bounds = arcs.getMultiShapeBounds(shp),
        idx = groupId(bounds),
        group = groups[idx];
    if (!group) {
      group = groups[idx] = {
        shapes: [],
        properties: properties ? [] : null,
        bounds: new Bounds(),
        name: MapShaper.getSplitLayerName(lyr.name, groupName(idx))
      };
    }
    group.shapes.push(shp);
    group.bounds.mergeBounds(bounds);
    if (group.properties) {
      group.properties.push(properties[i]);
    }
  });

  var layers = [];
  groups.forEach(function(group, i) {
    if (!group) return; // empty cell
    var groupLyr = {
      shapes: group.shapes,
      name: group.name
    };
    utils.defaults(groupLyr, lyr);
    if (group.properties) {
      groupLyr.data = new DataTable(group.properties);
    }
    layers.push(groupLyr);
  });

  return layers;
};




// Recursively divide a layer into two layers until a (compiled) expression
// no longer returns true. The original layer is split along the long side of
// its bounding box, so that each split-off layer contains half of the original
// shapes (+/- 1).
//
api.subdivideLayer = function(lyr, arcs, exp) {
  return MapShaper.subdivide(lyr, arcs, MapShaper.compileCalcExpression(exp));
};

MapShaper.subdivide = function(lyr, arcs, compiled) {
  var divide = compiled(lyr, arcs),
      subdividedLayers = [],
      tmp, bounds, lyr1, lyr2;

  if (!utils.isBoolean(divide)) {
    stop("[subdivide] Expression must evaluate to true or false");
  }
  if (divide) {
    bounds = MapShaper.getLayerBounds(lyr, arcs);
    tmp = MapShaper.divideLayer(lyr, arcs, bounds);
    lyr1 = tmp[0];
    if (lyr1.shapes.length > 1 && lyr1.shapes.length < lyr.shapes.length) {
      utils.merge(subdividedLayers, MapShaper.subdivide(lyr1, arcs, compiled));
    } else {
      subdividedLayers.push(lyr1);
    }

    lyr2 = tmp[1];
    if (lyr2.shapes.length > 1 && lyr2.shapes.length < lyr.shapes.length) {
      utils.merge(subdividedLayers, MapShaper.subdivide(lyr2, arcs, compiled));
    } else {
      subdividedLayers.push(lyr2);
    }
  } else {
    subdividedLayers.push(lyr);
  }

  subdividedLayers.forEach(function(lyr2, i) {
    lyr2.name = MapShaper.getSplitLayerName(lyr.name || 'split', i + 1);
    utils.defaults(lyr2, lyr);
  });
  return subdividedLayers;
};

// split one layer into two layers containing the same number of shapes (+-1),
// either horizontally or vertically
//
MapShaper.divideLayer = function(lyr, arcs, bounds) {
  var properties = lyr.data ? lyr.data.getRecords() : null,
      shapes = lyr.shapes,
      lyr1, lyr2;
  lyr1 = {
    geometry_type: lyr.geometry_type,
    shapes: [],
    data: properties ? [] : null
  };
  lyr2 = {
    geometry_type: lyr.geometry_type,
    shapes: [],
    data: properties ? [] : null
  };

  var useX = bounds && bounds.width() > bounds.height();
  // TODO: think about case where there are null shapes with NaN centers
  var centers = shapes.map(function(shp) {
    var bounds = arcs.getMultiShapeBounds(shp);
    return useX ? bounds.centerX() : bounds.centerY();
  });
  var ids = utils.range(centers.length);
  ids.sort(function(a, b) {
    return centers[a] - centers[b];
  });
  ids.forEach(function(shapeId, i) {
    var dest = i < shapes.length / 2 ? lyr1 : lyr2;
    dest.shapes.push(shapes[shapeId]);
    if (properties) {
      dest.data.push(properties[shapeId]);
    }
  });

  if (properties) {
    lyr1.data = new DataTable(lyr1.data);
    lyr2.data = new DataTable(lyr2.data);
  }
  return [lyr1, lyr2];
};




api.sortFeatures = function(lyr, arcs, opts) {
  var n = MapShaper.getFeatureCount(lyr),
      ascending = !opts.descending,
      compiled = MapShaper.compileValueExpression(opts.expression, lyr, arcs),
      values = [];

  utils.repeat(n, function(i) {
    values.push(compiled(i));
  });

  var ids = utils.getSortedIds(values, ascending);
  if (lyr.shapes) {
    utils.reorderArray(lyr.shapes, ids);
  }
  if (lyr.data) {
    utils.reorderArray(lyr.data.getRecords(), ids);
  }
};




// TODO: consider refactoring to allow modules
// @cmd  example: {name: "dissolve", options:{field: "STATE"}}
// @dataset  format: {arcs: <ArcCollection>, layers:[]}
// @done callback: function(err, dataset)
//
api.runCommand = function(cmd, dataset, cb) {
  var name = cmd.name,
      opts = cmd.options,
      targetLayers,
      outputLayers,
      outputFiles,
      arcs;

  try { // catch errors from synchronous functions

    T.start();
    if (dataset) {
      arcs = dataset.arcs;
      if (dataset.layers.length > 0 === false) {
        error("Dataset contains 0 layers");
      }

      if (opts.target) {
        targetLayers = MapShaper.findMatchingLayers(dataset.layers, opts.target);
        if (!targetLayers.length) {
          stop(utils.format('[%s] Missing target layer: %s\nAvailable layers: %s',
            name, opts.target, MapShaper.getFormattedLayerList(dataset.layers)));
        }
      } else {
        targetLayers = dataset.layers; // default: all layers
      }
    }

    if (name == 'calc') {
      MapShaper.applyCommand(api.calc, targetLayers, arcs, opts);

    } else if (name == 'clip') {
      api.clipLayers(targetLayers, opts.source, dataset, opts);

    } else if (name == 'dissolve') {
      outputLayers = MapShaper.applyCommand(api.dissolve, targetLayers, arcs, opts);

    } else if (name == 'dissolve2') {
      outputLayers = MapShaper.applyCommand(api.dissolve2, targetLayers, dataset, opts);

    } else if (name == 'each') {
      MapShaper.applyCommand(api.evaluateEachFeature, targetLayers, arcs, opts.expression, opts);

    } else if (name == 'erase') {
      api.eraseLayers(targetLayers, opts.source, dataset, opts);

    } else if (name == 'explode') {
      outputLayers = MapShaper.applyCommand(api.explodeFeatures, targetLayers, arcs, opts);

    } else if (name == 'filter') {
      outputLayers = MapShaper.applyCommand(api.filterFeatures, targetLayers, arcs, opts);

    } else if (name == 'filter-fields') {
      MapShaper.applyCommand(api.filterFields, targetLayers, opts.fields);

    } else if (name == 'filter-islands') {
      MapShaper.applyCommand(api.filterIslands, targetLayers, arcs, opts);

    } else if (name == 'filter-slivers') {
      MapShaper.applyCommand(api.filterSlivers, targetLayers, arcs, opts);

    } else if (name == 'flatten') {
      outputLayers = MapShaper.applyCommand(api.flattenLayer, targetLayers, dataset, opts);

    } else if (name == 'i') {
      dataset = api.importFiles(cmd.options);

    } else if (name == 'info') {
      api.printInfo(dataset);

    } else if (name == 'inspect') {
      MapShaper.applyCommand(api.inspect, targetLayers, arcs, opts);

    } else if (name == 'innerlines') {
      outputLayers = MapShaper.applyCommand(api.innerlines, targetLayers, arcs, opts);

    } else if (name == 'join') {
      MapShaper.applyCommand(api.join, targetLayers, dataset, opts);

    } else if (name == 'layers') {
      outputLayers = MapShaper.applyCommand(api.filterLayers, dataset.layers, opts.layers);

    } else if (name == 'lines') {
      outputLayers = MapShaper.applyCommand(api.lines, targetLayers, arcs, opts);

    } else if (name == 'stitch') {
      api.stitch(dataset);

    } else if (name == 'merge-layers') {
      // careful, returned layers are modified input layers
      outputLayers = api.mergeLayers(targetLayers);

    } else if (name == 'o') {
      outputFiles = MapShaper.exportFileContent(utils.defaults({layers: targetLayers}, dataset), opts);
      if (opts.__nowrite) {
        done(null, outputFiles);
      } else {
        MapShaper.writeFiles(outputFiles, opts, done);
      }
      return;

    } else if (name == 'points') {
      outputLayers = MapShaper.applyCommand(api.createPointLayer, targetLayers, arcs, opts);

    } else if (name == 'proj') {
      api.proj(dataset, opts);

    } else if (name == 'rename-fields') {
      MapShaper.applyCommand(api.renameFields, targetLayers, opts.fields);

    } else if (name == 'rename-layers') {
      api.renameLayers(targetLayers, opts.names);

    } else if (name == 'repair') {
      outputLayers = MapShaper.repairPolygonGeometry(targetLayers, dataset, opts);

    } else if (name == 'simplify') {
      api.simplify(dataset, opts);

    } else if (name == 'sort') {
      MapShaper.applyCommand(api.sortFeatures, targetLayers, arcs, opts);

    } else if (name == 'split') {
      outputLayers = MapShaper.applyCommand(api.splitLayer, targetLayers, opts.field, opts);

    } else if (name == 'split-on-grid') {
      outputLayers = MapShaper.applyCommand(api.splitLayerOnGrid, targetLayers, arcs, opts.rows, opts.cols);

    } else if (name == 'subdivide') {
      outputLayers = MapShaper.applyCommand(api.subdivideLayer, targetLayers, arcs, opts.expression);

    } else if (name == 'svg-style') {
      MapShaper.applyCommand(api.svgStyle, targetLayers, dataset, opts);

    } else {

      error("Unhandled command: [" + name + "]");
    }

    // apply name parameter
    if ('name' in opts) {
      // TODO: consider uniqifying multiple layers here
      (outputLayers || targetLayers || dataset.layers).forEach(function(lyr) {
        lyr.name = opts.name;
      });
    }

    // integrate output layers into the dataset
    if (outputLayers) {
      if (opts.no_replace) {
        dataset.layers = dataset.layers.concat(outputLayers);
      } else {
        // TODO: consider replacing old layers as they are generated, for gc
        MapShaper.replaceLayers(dataset, targetLayers, outputLayers);
      }
    }
  } catch(e) {
    done(e);
    return;
  }

  done(null);

  function done(err, output) {
    T.stop('-' + name);
    cb(err, err ? null : output || dataset);
  }
};

// Apply a command to an array of target layers
MapShaper.applyCommand = function(func, targetLayers) {
  var args = utils.toArray(arguments).slice(2);
  return targetLayers.reduce(function(memo, lyr) {
    var result = func.apply(null, [lyr].concat(args));
    if (utils.isArray(result)) { // some commands return an array of layers
      memo = memo.concat(result);
    } else if (result) { // assuming result is a layer
      memo.push(result);
    }
    return memo;
  }, []);
};

MapShaper.getFormattedLayerList = function(layers) {
  return layers.reduce(function(memo, lyr, i) {
    return memo + '\n  [' + i + ']  ' + (lyr.name || '[unnamed]');
  }, '') || '[none]';
};






function CommandParser() {
  var commandRxp = /^--?([a-z][\w-]*)$/i,
      assignmentRxp = /^([a-z0-9_+-]+)=(?!\=)(.*)$/i, // exclude ==
      _usage = "",
      _examples = [],
      _commands = [],
      _default = null,
      _note;

  if (this instanceof CommandParser === false) return new CommandParser();

  this.usage = function(str) {
    _usage = str;
    return this;
  };

  this.note = function(str) {
    _note = str;
    return this;
  };

  // set a default command; applies to command line args preceding the first
  // explicit command
  this.default = function(str) {
    _default = str;
  };

  this.example = function(str) {
    _examples.push(str);
  };

  this.command = function(name) {
    var opts = new CommandOptions(name);
    _commands.push(opts);
    return opts;
  };

  this.parseArgv = function(raw) {
    var commandDefs = getCommands(),
        commands = [], cmd,
        argv = raw.map(utils.trimQuotes), // remove one level of single or dbl quotes
        cmdName, cmdDef, opt;

    if (argv.length == 1 && tokenIsCommandName(argv[0])) {
      // show help if only a command name is given
      argv.unshift('-help'); // kludge (assumes -help <command> syntax)
    } else if (argv.length > 0 && !tokenLooksLikeCommand(argv[0]) && _default) {
      // if there are arguments before the first explicit command, use the default command
      argv.unshift('-' + _default);
    }

    while (argv.length > 0) {
      cmdName = readCommandName(argv);
      if (!cmdName) {
        stop("Invalid command:", argv[0]);
      }
      cmdDef = findCommandDefn(cmdName, commandDefs);
      if (!cmdDef) {
        stop("Unknown command:", cmdName);
      }
      cmd = {
        name: cmdDef.name,
        options: {},
        _: []
      };

      while (argv.length > 0 && !tokenLooksLikeCommand(argv[0])) {
        readOption(cmd, argv, cmdDef);
      }

      if (cmdDef.validate) {
        try {
          cmdDef.validate(cmd);
        } catch(e) {
          stop("[" + cmdName + "] " + e.message);
        }
      }
      commands.push(cmd);
    }
    return commands;

    function tokenIsCommandName(s) {
      return !!utils.find(getCommands(), function(cmd) {
        return s === cmd.name || s === cmd.alias;
      });
    }

    function tokenLooksLikeCommand(s) {
      return commandRxp.test(s);
    }

    // Try to parse an assignment @token for command @cmdDef
    function parseAssignment(cmd, token, cmdDef) {
      var match = assignmentRxp.exec(token),
          name = match[1],
          val = utils.trimQuotes(match[2]),
          optDef = findOptionDefn(name, cmdDef);

      if (!optDef) {
        // Assignment to an unrecognized identifier could be an expression
        // (e.g. -each 'id=$.id') -- save for later parsing
        cmd._.push(token);
      } else if (optDef.type == 'flag' || optDef.assign_to) {
        stop("-" + cmdDef.name + " " + name + " option doesn't take a value");
      } else {
        readOption(cmd, [name, val], cmdDef);
      }
    }

    // Try to read an option for command @cmdDef from @argv
    function readOption(cmd, argv, cmdDef) {
      var token = argv.shift(),
          optDef = findOptionDefn(token, cmdDef),
          optName;

      if (assignmentRxp.test(token)) {
        parseAssignment(cmd, token, cmdDef);
        return;
      }

      if (!optDef) {
        // not a defined option; add it to _ array for later processing
        cmd._.push(token);
        return;
      }

      optName = optDef.alias_to || optDef.name;
      optName = optName.replace(/-/g, '_');

      if (optDef.assign_to) {
        cmd.options[optDef.assign_to] = optDef.name;
      } else if (optDef.type == 'flag') {
        cmd.options[optName] = true;
      } else {
        cmd.options[optName] = readOptionValue(argv, optDef);
      }
    }

    // Read an option value for @optDef from @argv
    function readOptionValue(argv, optDef) {
      var type = optDef.type,
          val, err, token;
      if (argv.length === 0 || tokenLooksLikeCommand(argv[0])) {
        err = 'Missing value';
      } else {
        token = argv.shift(); // remove token from argv
        if (type == 'number') {
          val = Number(token);
        } else if (type == 'integer') {
          val = Math.round(Number(token));
        } else if (type == 'comma-sep') {
          val = token.split(',');
        } else {
          val = token; // assumes string
        }

        if (val !== val) {
          err = "Invalid numeric value";
        }
      }

      if (err) {
        stop(err + " for option " + optDef.name + "=<value>");
      }
      return val;
    }

    // Check first element of an array of tokens; remove and return if it looks
    // like a command name, else return null;
    function readCommandName(args) {
      var match = commandRxp.exec(args[0]);
      if (match) {
        args.shift();
        return match[1];
      }
      return null;
    }

    function findCommandDefn(name, arr) {
      return utils.find(arr, function(cmd) {
        return cmd.name === name || cmd.alias === name;
      });
    }

    function findOptionDefn(name, cmd) {
      return utils.find(cmd.options, function(o) {
        return o.name === name || o.alias === name;
      });
    }
  };

  this.getHelpMessage = function(commandNames) {
    var helpStr = '',
        cmdPre = '  ',
        optPre = '  ',
        exPre = '  ',
        gutter = '  ',
        colWidth = 0,
        detailView = false,
        helpCommands, allCommands;

    allCommands = getCommands().filter(function(cmd) {
      // hide commands without a description
      return !!cmd.describe;
    });

    if (commandNames) {
      detailView = true;
      helpCommands = commandNames.reduce(function(memo, name) {
        var cmd = utils.find(allCommands, function(cmd) {return cmd.name == name;});
        if (cmd) memo.push(cmd);
        return memo;
      }, []);

      allCommands.filter(function(cmd) {
        return utils.contains(commandNames, cmd.name);
      });
      if (helpCommands.length === 0) {
        detailView = false;
      }
    }

    if (!detailView) {
      if (_usage) {
        helpStr +=  "\n" + _usage + "\n\n";
      }
      helpCommands = allCommands;
    }

    // Format help strings, calc width of left column.
    colWidth = helpCommands.reduce(function(w, obj) {
      var help = cmdPre + (obj.name ? "-" + obj.name : "");
      if (obj.alias) help += ", -" + obj.alias;
      obj.help = help;
      if (detailView) {
        w = obj.options.reduce(function(w, opt) {
          if (opt.describe) {
            w = Math.max(formatOption(opt), w);
          }
          return w;
        }, w);
      }
      return Math.max(w, help.length);
    }, 0);

    // Layout help display
    helpCommands.forEach(function(cmd) {
      if (!detailView && cmd.title) {
        helpStr += cmd.title + "\n";
      }
      if (detailView) {
        helpStr += '\nCommand\n';
      }
      helpStr += formatHelpLine(cmd.help, cmd.describe);
      if (detailView && cmd.options.length > 0) {
        helpStr += '\nOptions\n';
        cmd.options.forEach(function(opt) {
          if (opt.help && opt.describe) {
            helpStr += formatHelpLine(opt.help, opt.describe);
          }
        });
      }
      if (detailView && cmd.examples) {
        helpStr += '\nExample' + (cmd.examples.length > 1 ? 's' : ''); //  + '\n';
        cmd.examples.forEach(function(ex) {
          ex.split('\n').forEach(function(line) {
            helpStr += '\n' + exPre + line;
          });
          helpStr += '\n';
        });
      }
    });

    // additional notes for non-detail view
    if (!detailView) {
      if (_examples.length > 0) {
        helpStr += "\nExamples\n";
        _examples.forEach(function(str) {
          helpStr += "\n" + str + "\n";
        });
      }
      if (_note) {
        helpStr += '\n' + _note;
      }
    }

    return helpStr;

    function formatHelpLine(help, desc) {
      return utils.rpad(help, colWidth, ' ') + gutter + (desc || '') + '\n';
    }

    function formatOption(o) {
      o.help = optPre;
      if (o.label) {
        o.help += o.label;
      } else {
        o.help += o.name;
        if (o.alias) o.help += ", " + o.alias;
        if (o.type != 'flag' && !o.assign_to) o.help += "=";
      }
      return o.help.length;
    }

  };

  this.printHelp = function(commands) {
    message(this.getHelpMessage(commands));
  };

  function getCommands() {
    return _commands.map(function(cmd) {
      return cmd.done();
    });
  }
}

function CommandOptions(name) {
  var _command = {
    name: name,
    options: []
  };

  this.validate = function(f) {
    _command.validate = f;
    return this;
  };

  this.describe = function(str) {
    _command.describe = str;
    return this;
  };

  this.example = function(str) {
    if (!_command.examples) {
      _command.examples = [];
    }
    _command.examples.push(str);
    return this;
  };

  this.alias = function(name) {
    _command.alias = name;
    return this;
  };

  this.title = function(str) {
    _command.title = str;
    return this;
  };

  this.option = function(name, opts) {
    opts = opts || {}; // accept just a name -- some options don't need properties
    if (!utils.isString(name) || !name) error("Missing option name");
    if (!utils.isObject(opts)) error("Invalid option definition:", opts);
    opts.name = name;
    _command.options.push(opts);
    return this;
  };

  this.done = function() {
    return _command;
  };
}





function validateHelpOpts(cmd) {
  var commands = validateCommaSepNames(cmd._[0]);
  if (commands) {
    cmd.options.commands = commands;
  }
}

function validateInputOpts(cmd) {
  var o = cmd.options,
      _ = cmd._;

  if (_[0] == '-' || _[0] == '/dev/stdin') {
    o.stdin = true;
  } else if (_.length > 0) {
    o.files = _;
  }

  if ("precision" in o && o.precision > 0 === false) {
    error("precision= option should be a positive number");
  }

  if (o.encoding) {
    o.encoding = MapShaper.validateEncoding(o.encoding);
  }
}

function validateSimplifyOpts(cmd) {
  var o = cmd.options,
      _ = cmd._;

  var pctStr = o.pct || "";
  if (_.length > 0) {
    if (/^[0-9.]+%?$/.test(_[0])) {
      pctStr = _.shift();
    }
    if (_.length > 0) {
      error("Unparsable option:", _.join(' '));
    }
  }

  if (pctStr) {
    var isPct = pctStr.indexOf('%') > 0;
    if (isPct) {
      o.pct = Number(pctStr.replace('%', '')) / 100;
    } else {
      o.pct = Number(pctStr);
    }
    if (!(o.pct >= 0 && o.pct <= 1)) {
      error(utils.format("Out-of-range pct value: %s", pctStr));
    }
  }

  var intervalStr = o.interval;
  if (intervalStr) {
    o.interval = Number(intervalStr);
    if (o.interval >= 0 === false) {
      error(utils.format("Out-of-range interval value: %s", intervalStr));
    }
  }

  if (isNaN(o.interval) && isNaN(o.pct) && !o.resolution) {
    error("Command requires an interval, pct or resolution parameter");
  }
}

function validateJoinOpts(cmd) {
  var o = cmd.options;
  o.source = o.source || cmd._[0];
  if (!o.source) {
    error("Command requires the name of a layer or file to join");
  }
}

function validateSplitOpts(cmd) {
  if (cmd._.length == 1) {
    cmd.options.field = cmd._[0];
  } else if (cmd._.length > 1) {
    error("Command takes a single field name");
  }
}

function validateClipOpts(cmd) {
  var opts = cmd.options;
  if (cmd._[0]) {
    opts.source = cmd._[0];
  }
  // rename old option
  if (opts.cleanup) {
    delete opts.cleanup;
    opts.remove_slivers = true;
  }
  if (opts.bbox) {
    // assume comma-sep bbox has been parsed into array of strings
    opts.bbox = opts.bbox.map(parseFloat);
  }
  if (!opts.source && !opts.bbox) {
    error("Command requires a source file, layer id or bbox");
  }
}

function validateDissolveOpts(cmd) {
  var _= cmd._,
      o = cmd.options;
  if (_.length == 1) {
    o.field = _[0];
  } else if (_.length > 1) {
    error("Command takes a single field name");
  }
}

function validateMergeLayersOpts(cmd) {
  if (cmd._.length > 0) error("Unexpected option:", cmd._);
}

function validateRenameLayersOpts(cmd) {
  cmd.options.names = validateCommaSepNames(cmd._[0]) || null;
}

function validateSplitOnGridOpts(cmd) {
  var o = cmd.options;
  if (cmd._.length == 1) {
    var tmp = cmd._[0].split(',');
    o.cols = parseInt(tmp[0], 10);
    o.rows = parseInt(tmp[1], 10) || o.cols;
  }

  if (o.rows > 0 === false || o.cols > 0 === false) {
    error("Command expects cols,rows");
  }
}

function validateLinesOpts(cmd) {
  try {
    var fields = validateCommaSepNames(cmd.options.fields || cmd._[0]);
    if (fields) cmd.options.fields = fields;
  } catch (e) {
    error("Command takes a comma-separated list of fields");
  }
}


function validateInnerLinesOpts(cmd) {
  if (cmd._.length > 0) {
    error("Command takes no arguments");
  }
}

function validateSubdivideOpts(cmd) {
  if (cmd._.length !== 1) {
    error("Command requires a JavaScript expression");
  }
  cmd.options.expression = cmd._[0];
}

function validateFilterFieldsOpts(cmd) {
  try {
    var fields = validateCommaSepNames(cmd._[0]);
    cmd.options.fields = fields || [];
  } catch(e) {
    error("Command requires a comma-sep. list of fields");
  }
}

function validateExpressionOpts(cmd) {
  if (cmd._.length == 1) {
    cmd.options.expression = cmd._[0];
  } else if (cmd._.length > 1) {
    error("Unparsable arguments:", cmd._);
  }
}

function validateOutputOpts(cmd) {
  var _ = cmd._,
      o = cmd.options,
      arg = _[0] || "",
      pathInfo = utils.parseLocalPath(arg);

  if (_.length > 1) {
    error("Command takes one file or directory argument");
  }

  if (arg == '-' || arg == '/dev/stdout') {
    o.stdout = true;
  } else if (arg && !pathInfo.extension) {
    if (!cli.isDirectory(arg)) {
      error("Unknown output option:", arg);
    }
    o.output_dir = arg;
  } else if (arg) {
    if (pathInfo.directory) {
      o.output_dir = pathInfo.directory;
      cli.validateOutputDir(o.output_dir);
    }
    o.output_file = pathInfo.filename;
    if (MapShaper.filenameIsUnsupportedOutputType(o.output_file)) {
      error("Output file looks like an unsupported file type:", o.output_file);
    }
  }

  if (o.format) {
    o.format = o.format.toLowerCase();
    if (o.format == 'csv') {
      o.format = 'dsv';
      o.delimiter = o.delimiter || ',';
    } else if (o.format == 'tsv') {
      o.format = 'dsv';
      o.delimiter = o.delimiter || '\t';
    }
    if (!MapShaper.isSupportedOutputFormat(o.format)) {
      error("Unsupported output format:", o.format);
    }
  }

  if (o.delimiter) {
    // convert "\t" '\t' \t to tab
    o.delimiter = o.delimiter.replace(/^["']?\\t["']?$/, '\t');
    if (!MapShaper.isSupportedDelimiter(o.delimiter)) {
      error("Unsupported delimiter:", o.delimiter);
    }
  }

  if (o.encoding) {
    o.encoding = MapShaper.validateEncoding(o.encoding);
  }

  // topojson-specific
  if ("quantization" in o && o.quantization > 0 === false) {
    error("quantization= option should be a nonnegative integer");
  }

  if ("topojson_precision" in o && o.topojson_precision > 0 === false) {
    error("topojson-precision= option should be a positive number");
  }

}

// Convert a comma-separated string into an array of trimmed strings
// Return null if list is empty
function validateCommaSepNames(str, min) {
  if (!min && !str) return null; // treat
  if (!utils.isString(str)) {
    error ("Expected a comma-separated list; found:", str);
  }
  var parts = str.split(',').map(utils.trim).filter(function(s) {return !!s;});
  if (min && min > parts.length < min) {
    error(utils.format("Expected a list of at least %d member%s; found: %s", min, utils.pluralSuffix(min), str));
  }
  return parts.length > 0 ? parts : null;
}




MapShaper.splitShellTokens = function(str) {
  var BAREWORD = '([^\\s\'"])+';
  var SINGLE_QUOTE = '"((\\\\"|[^"])*?)"';
  var DOUBLE_QUOTE = '\'((\\\\\'|[^\'])*?)\'';
  var rxp = new RegExp('(' + BAREWORD + '|' + SINGLE_QUOTE + '|' + DOUBLE_QUOTE + ')*', 'g');
  var matches = str.match(rxp) || [];
  var chunks = matches.filter(function(chunk) {
    // single backslashes may be present in multiline commands pasted from a makefile, e.g.
    return !!chunk && chunk != '\\';
  }).map(utils.trimQuotes);
  return chunks;
};

utils.trimQuotes = function(raw) {
  var len = raw.length, first, last;
  if (len >= 2) {
    first = raw.charAt(0);
    last = raw.charAt(len-1);
    if (first == '"' && last == '"' || first == "'" && last == "'") {
      return raw.substr(1, len-2);
    }
  }
  return raw;
};




MapShaper.getOptionParser = function() {
  // definitions of options shared by more than one command
  var targetOpt = {
        describe: "layer(s) to target (comma-sep. list); default is all layers"
      },
      nameOpt = {
        describe: "rename the edited layer(s)"
      },
      noReplaceOpt = {
        alias: "+",
        type: 'flag',
        describe: "retain the original layer(s) instead of replacing"
      },
      encodingOpt = {
        describe: "text encoding (applies to .dbf and delimited text files)"
      },
      autoSnapOpt = {
        alias: "snap",
        describe: "snap nearly identical points to fix minor topology errors",
        type: "flag"
      },
      snapIntervalOpt = {
        describe: "specify snapping distance in source units",
        type: "number"
      },
      sumFieldsOpt = {
        describe: "fields to sum when dissolving  (comma-sep. list)",
        type: "comma-sep"
      },
      copyFieldsOpt = {
        describe: "fields to copy when dissolving (comma-sep. list)",
        type: "comma-sep"
      },
      dissolveFieldOpt = {
        label: "<field>",
        describe: "(optional) name of a data field to dissolve on"
      },
      bboxOpt = {
        type: "comma-sep",
        describe: "comma-sep. bounding box: xmin,ymin,xmax,ymax"
      };

  var parser = new CommandParser(),
      usage = "Usage:  mapshaper -<command> [options] ...";

  parser.usage(usage);

  /*
  parser.example("Fix minor topology errors, simplify to 10%, convert to GeoJSON\n" +
      "$ mapshaper states.shp auto-snap -simplify 10% -o format=geojson");

  parser.example("Aggregate census tracts to counties\n" +
      "$ mapshaper tracts.shp -each \"CTY_FIPS=FIPS.substr(0, 5)\" -dissolve CTY_FIPS");
  */

  parser.note("Enter mapshaper -help <command> to view options for a single command");

  parser.default('i');

  parser.command('i')
    .title("Editing commands")
    .describe("input one or more files")
    .validate(validateInputOpts)
    .option("files", {
      label: "<file(s)>",
      describe: "files to import (separated by spaces), or - to use stdin"
    })
    .option("merge-files", {
      describe: "merge features from compatible files into the same layer",
      type: "flag"
    })
    .option("combine-files", {
      describe: "import files to separate layers with shared topology",
      type: "flag"
    })
    .option("no-topology", {
      describe: "treat each shape as topologically independent",
      type: "flag"
    })
    .option("precision", {
      describe: "coordinate precision in source units, e.g. 0.001",
      type: "number"
    })
    .option("auto-snap", autoSnapOpt)
    .option("snap-interval", snapIntervalOpt)
    .option("encoding", encodingOpt)
    /*
    .option("fields", {
      describe: "attribute fields to import (comma-sep.) (default is all fields)",
      type: "comma-sep"
    }) */
    .option("id-field", {
      describe: "import Topo/GeoJSON id property to this field"
    })
    .option("field-types", {
      describe: "type hints for csv files, e.g. FIPS:str,STATE_FIPS:str",
      type: "comma-sep"
    })
    .option("name", {
      describe: "Rename the imported layer(s)"
    });

  parser.command('o')
    .describe("output edited content")
    .validate(validateOutputOpts)
    .option('_', {
      label: "<file|dir|->",
      describe: "(optional) name of output file or directory, or - for stdout"
    })
    .option("format", {
      describe: "options: shapefile,geojson,topojson,json,dbf,csv,tsv,svg"
    })
    .option("target", targetOpt)
    .option("force", {
      type: "flag",
      describe: "let output files overwrite existing files"
    })
    .option("dry-run", {
      // describe: "do not output any files"
      type: "flag"
    })
    .option("encoding", {
      describe: "text encoding of output dbf file"
    })
    .option("ldid", {
      // describe: "language driver id of dbf file",
      type: "number"
    })
    .option("bbox-index", {
      describe: "export a .json file with bbox of each layer",
      type: 'flag'
    })
    .option("cut-table", {
      describe: "detach data attributes from shapes and save as a JSON file",
      type: "flag"
    })
    .option("drop-table", {
      describe: "remove data attributes from output",
      type: "flag"
    })
    .option("precision", {
      describe: "coordinate precision in source units, e.g. 0.001",
      type: "number"
    })
    .option("bbox", {
      type: "flag",
      describe: "(Topo/GeoJSON) add bbox property"
    })
    .option("prettify", {
      type: "flag",
      describe: "(Topo/GeoJSON) format output for readability"
    })
    .option("id-field", {
      describe: "(Topo/GeoJSON) field to use for id property",
      type: "comma-sep"
    })
    .option("quantization", {
      describe: "(TopoJSON) specify quantization (auto-set by default)",
      type: "integer"
    })
    .option("no-quantization", {
      describe: "(TopoJSON) export arc coordinates without quantization",
      type: "flag"
    })
    .option('presimplify', {
      describe: "(TopoJSON) add per-vertex data for dynamic simplification",
      type: "flag"
    })
    .option("topojson-precision", {
      // describe: "pct of avg segment length for rounding (0.02 is default)",
      type: "number"
    })
    .option("width", {
      describe: "(SVG) width of the SVG viewport (default is 800)",
      type: "number"
    })
    .option("margin", {
      describe: "(SVG) margin between data and viewport bounds (default is 1)",
      type: "number"
    })
    .option("svg-scale", {
      // describe: "(SVG) data units (e.g. meters) per pixel"
      type: "number"
    })
    .option("delimiter", {
      describe: "(CSV) field delimiter"
    });

  parser.command('simplify')
    .validate(validateSimplifyOpts)
    .example("Retain 10% of removable vertices\n$ mapshaper input.shp -simplify 10%")
    .describe("simplify the geometry of polygon and polyline features")
    .option('pct', {
      alias: 'p',
      label: "<x%>",
      describe: "percentage of removable points to retain, e.g. 10%"
    })
    .option("dp", {
      alias: "rdp",
      describe: "use Ramer-Douglas-Peucker simplification",
      assign_to: "method"
    })
    .option("visvalingam", {
      describe: "use Visvalingam simplification with \"effective area\" metric",
      assign_to: "method"
    })
    .option("weighted", {
      describe: "use weighted Visvalingam simplification (default)",
      assign_to: "method"
    })
    .option("method", {
      // hidden option
    })
    .option("weighting", {
      type: "number",
      describe: "weighted Visvalingam coefficient (default is 0.7)"
    })
    .option("resolution", {
      describe: "output resolution as a grid (e.g. 1000x500)"
    })
    .option("interval", {
      // alias: "i",
      describe: "output resolution as a distance (e.g. 100)",
      type: "number"
    })
    /*
    .option("value", {
      // for testing
      // describe: "raw value of simplification threshold",
      type: "number"
    })
    */
    .option("planar", {
      describe: "simplify decimal degree coords in 2D space (default is 3D)",
      type: "flag"
    })
    .option("cartesian", {
      describe: "(deprecated) alias for planar",
      type: "flag",
      alias_to: "planar"
    })
    .option("keep-shapes", {
      describe: "prevent small polygon features from disappearing",
      type: "flag"
    })
    .option("no-repair", {
      describe: "don't remove intersections introduced by simplification",
      type: "flag"
    })
    .option("stats", {
      describe: "display simplification statistics",
      type: "flag"
    });

  parser.command("join")
    .describe("join data records from a file or layer to a layer")
    .example("Join a csv table to a Shapefile\n" +
      "(The :str suffix prevents FIPS field from being converted from strings to numbers)\n" +
      "$ mapshaper states.shp -join data.csv keys=STATE_FIPS,FIPS -field-types=FIPS:str -o joined.shp")
    .validate(validateJoinOpts)
    .option("source", {
      label: "<file>",
      describe: "file containing data records"
    })
    .option("keys", {
      describe: "join by matching target,source key fields; e.g. keys=FIPS,GEOID",
      type: "comma-sep"
    })
    .option("fields", {
      describe: "fields to join, e.g. fields=FIPS,POP (default is all fields)",
      type: "comma-sep"
    })
    .option("field-types", {
      describe: "type hints for importing csv files, e.g. FIPS:str,STATE_FIPS:str",
      type: "comma-sep"
    })
    .option("sum-fields", {
      describe: "fields to sum when multiple source records match the same target",
      type: "comma-sep"
    })
    .option("where", {
      describe: "use a JS expression to filter source records"
    })
    .option("force", {
      describe: "replace values from same-named fields",
      type: "flag"
    })
    .option("unjoined", {
      describe: "copy unjoined records from source table to \"unjoined\" layer",
      type: "flag"
    })
    .option("unmatched", {
      describe: "copy unmatched records in target table to \"unmatched\" layer",
      type: "flag"
    })
    .option("encoding", encodingOpt)
    .option("target", targetOpt);

  parser.command("each")
    .describe("create/update/delete data fields using a JS expression")
    .example("Add two calculated data fields to a layer of U.S. counties\n" +
        "$ mapshaper counties.shp -each 'STATE_FIPS=CNTY_FIPS.substr(0, 2), AREA=$.area'")
    .validate(validateExpressionOpts)
    .option("expression", {
      label: "<expression>",
      describe: "JS expression to apply to each target feature"
    })
    .option("where", {
      describe: "use a JS expression to select a subset of features"
    })
    .option("target", targetOpt);

   parser.command("sort")
    .describe("sort features using a JS expression")
    .validate(validateExpressionOpts)
    .option("expression", {
      label: "<expression>",
      describe: "JS expression to generate a sort key for each feature"
    })
    .option("ascending", {
      describe: "Sort in ascending order (default)",
      type: "flag"
    })
    .option("descending", {
      describe: "Sort in descending order",
      type: "flag"
    })
    .option("target", targetOpt);

  parser.command("filter")
    .describe("delete features using a JS expression")
    .validate(validateExpressionOpts)
    .option("expression", {
      label: "<expression>",
      describe: "delete features that evaluate to false"
    })
    .option("remove-empty", {
      type: "flag",
      describe: "delete features with null geometry"
    })
    .option("keep-shapes", {
      type: "flag"
    })
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("filter-islands")
    .describe("remove small detached polygon rings (islands)")
    .validate(validateExpressionOpts)

    .option("min-area", {
      type: "number",
      describe: "remove small-area islands (sq meters or projected units)"
    })
    .option("min-vertices", {
      type: "integer",
      describe: "remove low-vertex-count islands"
    })
    .option("remove-empty", {
      type: "flag",
      describe: "delete features with null geometry"
    })
    .option("target", targetOpt);

  parser.command("filter-slivers")
    .describe("remove small polygon rings")
    .validate(validateExpressionOpts)

    .option("min-area", {
      type: "number",
      describe: "remove small-area rings (sq meters or projected units)"
    })
    /*
    .option("remove-empty", {
      type: "flag",
      describe: "delete features with null geometry"
    })
    */
    .option("target", targetOpt);

  parser.command("filter-fields")
    .describe('retain a subset of data fields')
    .validate(validateFilterFieldsOpts)
    .option("fields", {
      label: "<field(s)>",
      describe: "fields to retain (comma-sep.), e.g. 'fips,name'"
    })
    .option("target", targetOpt);

  parser.command("rename-fields")
    .describe('rename data fields')
    .validate(validateFilterFieldsOpts)
    .option("fields", {
      label: "<field(s)>",
      describe: "fields to rename (comma-sep.), e.g. 'fips=STATE_FIPS,st=state'"
    })
    .option("target", targetOpt);

  parser.command("clip")
    .describe("use a polygon layer to clip another layer")
    .example("$ mapshaper states.shp -clip land_area.shp -o clipped.shp")
    .validate(validateClipOpts)
    .option("source", {
      label: "<file|layer>",
      describe: "file or layer containing clip polygons"
    })
    .option('remove-slivers', {
      describe: "remove sliver polygons created by clipping",
      type: 'flag'
    })
    .option("cleanup", {type: 'flag'}) // obsolete; renamed in validation func.
    .option("bbox", bboxOpt)
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("erase")
    .describe("use a polygon layer to erase another layer")
    .example("$ mapshaper land_areas.shp -erase water_bodies.shp -o erased.shp")
    .validate(validateClipOpts)
    .option("source", {
      label: "<file|layer>",
      describe: "file or layer containing erase polygons"
    })
    .option('remove-slivers', {
      describe: "remove sliver polygons created by erasing",
      type: 'flag'
    })
    .option("cleanup", {type: 'flag'})
    .option("bbox", bboxOpt)
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("stitch");

  parser.command("dissolve")
    .validate(validateDissolveOpts)
    .describe("merge polygon or point features")
    .example("Dissolve all polygons in a feature layer into a single polygon\n" +
      "$ mapshaper states.shp -dissolve -o country.shp")
    .example("Generate state-level polygons by dissolving a layer of counties\n" +
      "(STATE_FIPS, POPULATION and STATE_NAME are attribute field names)\n" +
      "$ mapshaper counties.shp -dissolve STATE_FIPS copy-fields=STATE_NAME sum-fields=POPULATION -o states.shp")
    .option("field", dissolveFieldOpt)
    .option("sum-fields", sumFieldsOpt)
    .option("copy-fields", copyFieldsOpt)
    .option("weight", {
      describe: "[points] field or expression to use for weighting centroid"
    })
    .option("planar", {
      type: 'flag',
      describe: "[points] use 2D math to find centroids of latlong points"
    })
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("dissolve2")
    .validate(validateDissolveOpts)
    .describe("merge adjacent and overlapping polygons")
    .option("field", dissolveFieldOpt)
    .option("sum-fields", sumFieldsOpt)
    .option("copy-fields", copyFieldsOpt)
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("explode")
    .describe("divide multi-part features into single-part features")
    .option("convert-holes", {type: "flag"}) // testing
    .option("target", targetOpt);

  parser.command("innerlines")
    .describe("convert polygons to polylines along shared edges")
    .validate(validateInnerLinesOpts)
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("lines")
    .describe("convert polygons to polylines, classified by edge type")
    .validate(validateLinesOpts)
    .option("fields", {
      label: "<field(s)>",
      describe: "optional comma-sep. list of fields to create a hierarchy",
      type: "comma-sep"
    })
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("points")
    .describe("create a point layer from polygons or attribute data")
    .validate(function (cmd) {
      if (cmd._.length > 0) {
        error("Unknown argument:", cmd._[0]);
      }
    })
    .option("x", {
      describe: "field containing x coordinate"
    })
    .option("y", {
      describe: "field containing y coordinate"
    })
    .option("inner", {
      describe: "create an interior point for each polygon's largest ring",
      type: "flag"
    })
    .option("centroid", {
      describe: "create a centroid point for each polygon's largest ring",
      type: "flag"
    })
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("split")
    .describe("split features into separate layers using a data field")
    .validate(validateSplitOpts)
    .option("field", {
      label: '<field>',
      describe: "name of an attribute field (omit to split all features)"
    })
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("merge-layers")
    .describe("merge multiple layers into as few layers as possible")
    .validate(validateMergeLayersOpts)
    .option("name", nameOpt)
    .option("target", targetOpt);

  parser.command("rename-layers")
    .describe("assign new names to layers")
    .validate(validateRenameLayersOpts)
    .option("names", {
      label: "<name(s)>",
      type: "comma-sep",
      describe: "new layer name(s) (comma-sep. list)"
    })
    .option("target", targetOpt);

  parser.command("subdivide")
    .describe("recursively split a layer using a JS expression")
    .validate(validateSubdivideOpts)
    .option("expression", {
      label: "<expression>",
      describe: "boolean JS expression"
    })
    // .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("split-on-grid")
    .describe("split features into separate layers using a grid")
    .validate(validateSplitOnGridOpts)
    .option("-", {
      label: "<cols,rows>",
      describe: "size of the grid, e.g. -split-on-grid 12,10"
    })
    .option("cols", {
      type: "integer"
    })
    .option("rows", {
      type: "integer"
    })
    // .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("svg-style")
    .describe("set SVG style using JS expressions or literal values")
    .option("class", {
      describe: 'name of CSS class or classes (space sep.)'
    })
    .option("fill", {
      describe: 'fill color, examples: #eee pink rgba(0, 0, 0, 0.2)'
    })
    .option("stroke", {
      describe: 'stroke color'
    })
    .option("stroke-width", {
      describe: 'stroke width'
    })
    .option("opacity", {
      describe: 'opacity, example: 0.5'
    })
    .option("r", {
      describe: 'radius of circle symbols',
    })
    .option("target", targetOpt);

  parser.command("proj")
    // .describe("project the coordinates in a dataset")
    .option("densify", {
      type: "flag",
      describe: "interpolate points to approximate curves"
    })
    .option("spherical", {type: "flag"})
    .option("lng0", {type: "number"})
    .option("lat0", {type: "number"})
    .option("lat1", {type: "number"})
    .option("lat2", {type: "number"})
    .option("zone") // for UTM
    //.option("k0", {type: "number"})
    //.option("x0", {type: "number"})
    //.option("y0", {type: "number"})
    .validate(function(cmd) {
      var name = cmd._[0];
      if (!name) {
        error("Missing a projection name");
      }
      if (cmd._.length > 1) {
        error("Received one or more unknown projection parameters");
      }
      cmd.options.projection = name;
    });


  parser.command("calc")
    .title("\nInformational commands")
    .describe("calculate statistics about the features in a layer")
    .example("Calculate the total area of a polygon layer\n" +
      "$ mapshaper polygons.shp -calc 'sum($.area)'")
    .example("Count census blocks in NY with zero population\n" +
      "$ mapshaper ny-census-blocks.shp -calc 'count()' where='POPULATION == 0'")
    .validate(function(cmd) {
      if (cmd._.length === 0) {
        error("Missing a JS expression");
      }
      validateExpressionOpts(cmd);
    })
    .option("expression", {
      label: "<expression>",
      describe: "functions: sum() average() median() max() min() count()"
    })
    .option("where", {
      describe: "use a JS expression to select a subset of features"
    })
    .option("target", targetOpt);


  parser.command('encodings')
    .describe("print list of supported text encodings (for .dbf import)");

  parser.command('projections');
    // .describe("print names of supported projections");

  parser.command('version')
    .alias('v')
    .describe("print mapshaper version");

  parser.command('info')
    .describe("print information about data layers");

  parser.command('inspect')
    .describe("print information about a feature")
    .option("expression", {
      label: "<expression>",
      describe: "boolean JS expression for selecting a feature"
    })
    .option("target", targetOpt)
    .validate(function(cmd) {
      if (cmd._.length > 0) {
        cmd.options.expression = cmd._[0];
      }
    });

  parser.command('verbose')
    .describe("print verbose processing messages");

  parser.command('help')
    .alias('h')
    .validate(validateHelpOpts)
    .describe("print help; takes optional command name")
    .option("commands", {
      label: "<command>",
      type: "comma-sep",
      describe: "view detailed information about a command"
    });

  // Work-in-progress (no .describe(), so hidden from -h)
  parser.command('tracing');
  parser.command("flatten")
    .option("target", targetOpt);
  /*
  parser.command("divide")
    .option("name", nameOpt)
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("fill-holes")
    .option("no-replace", noReplaceOpt)
    .option("target", targetOpt);

  parser.command("repair")
    .option("target", targetOpt);
  */

  return parser;
};




// Parse an array or a string of command line tokens into an array of
// command objects.
MapShaper.parseCommands = function(tokens) {
  if (utils.isString(tokens)) {
    tokens = MapShaper.splitShellTokens(tokens);
  }
  return MapShaper.getOptionParser().parseArgv(tokens);
};

// Parse a command line string for the browser console
MapShaper.parseConsoleCommands = function(raw) {
  var str = raw.replace(/^mapshaper\b/, '').trim();
  var parsed;
  if (/^[a-z]/.test(str)) {
    // add hyphen prefix to bare command
    str = '-' + str;
  }
  if (utils.contains(MapShaper.splitShellTokens(str), '-i')) {
    stop("The input command cannot be run in the browser");
  }
  parsed = MapShaper.parseCommands(str);
  // block implicit initial -i command
  if (parsed.length > 0 && parsed[0].name == 'i') {
    stop(utils.format("Unable to run [%s]", raw));
  }
  return parsed;
};




// Parse command line args into commands and run them
// @argv Array of command line tokens or single string of commands
api.runCommands = function(argv, done) {
  var commands;
  try {
    commands = MapShaper.parseCommands(argv);
  } catch(e) {
    return done(e);
  }

  if (commands.length === 0) {
    return done(new APIError("No commands to run"));
  }

  T.start("Start timing");
  MapShaper.runParsedCommands(commands, function(err, output) {
    T.stop("Total time");
    done(err, output);
  });
};

// Apply a set of processing commands to the contents of an input file
// @argv Command line arguments, as string or array
// @done Callback: function(<error>, <output>)
api.applyCommands = function(argv, content, done) {
  MapShaper.processFileContent(argv, content, function(err, exports) {
    var output = null;
    if (!err) {
      output = exports.map(function(obj) {
        return obj.content;
      });
      if (output.length == 1) {
        output = output[0];
      }
    }
    done(err, output);
  });
};

// Capture output data instead of writing files (useful for testing)
// @tokens Command line arguments, as string or array
// @content (may be null) Contents of input data file
// @done: Callback function(<error>, <output>); <output> is an array of objects
//        with properties "content" and "filename"
MapShaper.processFileContent = function(tokens, content, done) {
  var dataset, commands, lastCmd, inOpts;
  try {
    commands = MapShaper.parseCommands(tokens);
    commands = MapShaper.runAndRemoveInfoCommands(commands);

    // if we're processing raw content, import it to a dataset object
    if (content) {
      // if first command is -i, use -i options for importing
      if (commands[0] && commands[0].name == 'i') {
        inOpts = commands.shift().options;
      } else {
        inOpts = {};
      }
      dataset = MapShaper.importFileContent(content, null, inOpts);
    }

    // if last command is -o, use -o options for exporting
    lastCmd = commands[commands.length-1];
    if (!lastCmd || lastCmd.name != 'o') {
      lastCmd = {name: 'o', options: {}};
      commands.push(lastCmd);
    }
    // export to callback, not file
    lastCmd.options.__nowrite = true;
  } catch(e) {
    return done(e);
  }

  MapShaper.runParsedCommands(commands, dataset, done);
};

// Execute a sequence of commands
// Signature: function(commands, [dataset,] done)
// @commands Array of parsed commands
// @done: function(<error>, <dataset>)
//
MapShaper.runParsedCommands = function(commands) {
  var dataset = null,
      done;

  if (arguments.length == 2) {
    done = arguments[1];
  } else if (arguments.length == 3) {
    dataset = arguments[1];
    done = arguments[2];
  }

  if (!utils.isFunction(done)) {
    error("[runParsedCommands()] Missing a callback function");
  }

  if (!utils.isArray(commands)) {
    error("[runParsedCommands()] Expected an array of parsed commands");
  }

  commands = MapShaper.runAndRemoveInfoCommands(commands);
  if (commands.length === 0) {
    return done(null, dataset);
  }
  commands = MapShaper.divideImportCommand(commands);
  if (commands[0].name != 'i' && !dataset) {
    return done(new APIError("Missing a -i command"));
  }

  utils.reduceAsync(commands, dataset, function(dataset, cmd, nextCmd) {
    api.runCommand(cmd, dataset, nextCmd);
  }, done);
};

// If an initial import command indicates that several input files should be
//   processed separately, then duplicate the sequence of commands to run
//   once for each input file
// @commands Array of parsed commands
// Returns: either original command array or array of duplicated commands.
//
MapShaper.divideImportCommand = function(commands) {
  var firstCmd = commands[0],
      firstOpts = firstCmd.options,
      files = firstOpts.files || [];

  if (firstCmd.name != 'i' || files.length <= 1 || firstOpts.stdin ||
      firstOpts.merge_files || firstOpts.combine_files) {
    return commands;
  }
  return files.reduce(function(memo, file) {
    var importCmd = {
      name: 'i',
      options: utils.defaults({files:[file]}, firstOpts)
    };
    memo.push(importCmd);
    memo.push.apply(memo, commands.slice(1));
    return memo;
  }, []);
};

// Call @iter on each member of an array (similar to Array#reduce(iter))
//    iter: function(memo, item, callback)
// Call @done when all members have been processed or if an error occurs
//    done: function(err, memo)
// @memo: Initial value
//
utils.reduceAsync = function(arr, memo, iter, done) {
  var call = typeof setImmediate == 'undefined' ? setTimeout : setImmediate;
  var i=0;
  next(null, memo);

  function next(err, memo) {
    // Detach next operation from call stack to prevent overflow
    // Don't use setTimeout(, 0) if setImmediate is available
    // (setTimeout() can introduce a long delay if previous operation was slow,
    //    as of Node 0.10.32 -- a bug?)
    if (err) {
      return done(err, null);
    }
    call(function() {
      if (i < arr.length === false) {
        done(null, memo);
      } else {
        iter(memo, arr[i++], next);
      }
    }, 0);
  }
};

// Handle information commands and remove them from the list
MapShaper.runAndRemoveInfoCommands = function(commands) {
  return commands.filter(function(cmd) {
    if (cmd.name == 'version') {
      message(MapShaper.VERSION);
    } else if (cmd.name == 'encodings') {
      MapShaper.printEncodings();
    } else if (cmd.name == 'projections') {
      MapShaper.printProjections();
    } else if (cmd.name == 'help') {
      MapShaper.getOptionParser().printHelp(cmd.options.commands);
    } else if (cmd.name == 'verbose') {
      MapShaper.VERBOSE = true;
    } else if (cmd.name == 'tracing') {
      MapShaper.TRACING = true;
    } else {
      return true;
    }
    return false;
  });
};




api.cli = cli;
api.internal = MapShaper;
api.utils = utils;
api.geom = geom;
this.mapshaper = api;

// Expose internal objects for testing
utils.extend(api.internal, {
  DataTable: DataTable,
  BinArray: BinArray,
  DouglasPeucker: DouglasPeucker,
  Visvalingam: Visvalingam,
  Heap: Heap,
  ShpReader: ShpReader,
  ShpType: ShpType,
  Dbf: Dbf,
  DbfReader: DbfReader,
  ShapefileTable: ShapefileTable,
  ArcCollection: ArcCollection,
  ArcIter: ArcIter,
  ShapeIter: ShapeIter,
  Bounds: Bounds,
  Transform: Transform,
  NodeCollection: NodeCollection,
  PolygonIndex: PolygonIndex,
  PathIndex: PathIndex,
  topojson: TopoJSON,
  geojson: GeoJSON,
  svg: SVG,
  APIError: APIError
});

if (typeof define === "function" && define.amd) {
  define("mapshaper", api);
} else if (typeof module === "object" && module.exports) {
  module.exports = api;
}

}());

}).call(this,require("buffer").Buffer)
},{"buffer":5,"d3-dsv":8,"fs":4,"iconv-lite":29,"path":34,"rbush":37,"rw":49}],2:[function(require,module,exports){
'use strict'

exports.toByteArray = toByteArray
exports.fromByteArray = fromByteArray

var lookup = []
var revLookup = []
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

function init () {
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i]
    revLookup[code.charCodeAt(i)] = i
  }

  revLookup['-'.charCodeAt(0)] = 62
  revLookup['_'.charCodeAt(0)] = 63
}

init()

function toByteArray (b64) {
  var i, j, l, tmp, placeHolders, arr
  var len = b64.length

  if (len % 4 > 0) {
    throw new Error('Invalid string. Length must be a multiple of 4')
  }

  // the number of equal signs (place holders)
  // if there are two placeholders, than the two characters before it
  // represent one byte
  // if there is only one, then the three characters before it represent 2 bytes
  // this is just a cheap hack to not do indexOf twice
  placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0

  // base64 is 4/3 + up to two characters of the original data
  arr = new Arr(len * 3 / 4 - placeHolders)

  // if there are placeholders, only get up to the last complete 4 chars
  l = placeHolders > 0 ? len - 4 : len

  var L = 0

  for (i = 0, j = 0; i < l; i += 4, j += 3) {
    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
    arr[L++] = (tmp >> 16) & 0xFF
    arr[L++] = (tmp >> 8) & 0xFF
    arr[L++] = tmp & 0xFF
  }

  if (placeHolders === 2) {
    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
    arr[L++] = tmp & 0xFF
  } else if (placeHolders === 1) {
    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
    arr[L++] = (tmp >> 8) & 0xFF
    arr[L++] = tmp & 0xFF
  }

  return arr
}

function tripletToBase64 (num) {
  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
  var tmp
  var output = []
  for (var i = start; i < end; i += 3) {
    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
    output.push(tripletToBase64(tmp))
  }
  return output.join('')
}

function fromByteArray (uint8) {
  var tmp
  var len = uint8.length
  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
  var output = ''
  var parts = []
  var maxChunkLength = 16383 // must be multiple of 3

  // go through the array every three bytes, we'll deal with trailing stuff later
  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
  }

  // pad the end with zeros, but make sure to not forget the extra bytes
  if (extraBytes === 1) {
    tmp = uint8[len - 1]
    output += lookup[tmp >> 2]
    output += lookup[(tmp << 4) & 0x3F]
    output += '=='
  } else if (extraBytes === 2) {
    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
    output += lookup[tmp >> 10]
    output += lookup[(tmp >> 4) & 0x3F]
    output += lookup[(tmp << 2) & 0x3F]
    output += '='
  }

  parts.push(output)

  return parts.join('')
}

},{}],3:[function(require,module,exports){

},{}],4:[function(require,module,exports){
arguments[4][3][0].apply(exports,arguments)
},{"dup":3}],5:[function(require,module,exports){
(function (global){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')
var isArray = require('isarray')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Use Object implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * Due to various browser bugs, sometimes the Object implementation will be used even
 * when the browser supports typed arrays.
 *
 * Note:
 *
 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
 *
 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
 *
 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
 *     incorrect length in some situations.

 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
 * get the Object implementation, which is slower but behaves correctly.
 */
Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
  ? global.TYPED_ARRAY_SUPPORT
  : typedArraySupport()

/*
 * Export kMaxLength after typed array support is determined.
 */
exports.kMaxLength = kMaxLength()

function typedArraySupport () {
  try {
    var arr = new Uint8Array(1)
    arr.foo = function () { return 42 }
    return arr.foo() === 42 && // typed array instances can be augmented
        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
  } catch (e) {
    return false
  }
}

function kMaxLength () {
  return Buffer.TYPED_ARRAY_SUPPORT
    ? 0x7fffffff
    : 0x3fffffff
}

function createBuffer (that, length) {
  if (kMaxLength() < length) {
    throw new RangeError('Invalid typed array length')
  }
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = new Uint8Array(length)
    that.__proto__ = Buffer.prototype
  } else {
    // Fallback: Return an object instance of the Buffer class
    if (that === null) {
      that = new Buffer(length)
    }
    that.length = length
  }

  return that
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer (arg, encodingOrOffset, length) {
  if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
    return new Buffer(arg, encodingOrOffset, length)
  }

  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new Error(
        'If encoding is specified then the first argument must be a string'
      )
    }
    return allocUnsafe(this, arg)
  }
  return from(this, arg, encodingOrOffset, length)
}

Buffer.poolSize = 8192 // not used by this implementation

// TODO: Legacy, not needed anymore. Remove in next major version.
Buffer._augment = function (arr) {
  arr.__proto__ = Buffer.prototype
  return arr
}

function from (that, value, encodingOrOffset, length) {
  if (typeof value === 'number') {
    throw new TypeError('"value" argument must not be a number')
  }

  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
    return fromArrayBuffer(that, value, encodingOrOffset, length)
  }

  if (typeof value === 'string') {
    return fromString(that, value, encodingOrOffset)
  }

  return fromObject(that, value)
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
  return from(null, value, encodingOrOffset, length)
}

if (Buffer.TYPED_ARRAY_SUPPORT) {
  Buffer.prototype.__proto__ = Uint8Array.prototype
  Buffer.__proto__ = Uint8Array
  if (typeof Symbol !== 'undefined' && Symbol.species &&
      Buffer[Symbol.species] === Buffer) {
    // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
    Object.defineProperty(Buffer, Symbol.species, {
      value: null,
      configurable: true
    })
  }
}

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be a number')
  }
}

function alloc (that, size, fill, encoding) {
  assertSize(size)
  if (size <= 0) {
    return createBuffer(that, size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpretted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(that, size).fill(fill, encoding)
      : createBuffer(that, size).fill(fill)
  }
  return createBuffer(that, size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
  return alloc(null, size, fill, encoding)
}

function allocUnsafe (that, size) {
  assertSize(size)
  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
  if (!Buffer.TYPED_ARRAY_SUPPORT) {
    for (var i = 0; i < size; i++) {
      that[i] = 0
    }
  }
  return that
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
  return allocUnsafe(null, size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
  return allocUnsafe(null, size)
}

function fromString (that, string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8'
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('"encoding" must be a valid string encoding')
  }

  var length = byteLength(string, encoding) | 0
  that = createBuffer(that, length)

  that.write(string, encoding)
  return that
}

function fromArrayLike (that, array) {
  var length = checked(array.length) | 0
  that = createBuffer(that, length)
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

function fromArrayBuffer (that, array, byteOffset, length) {
  array.byteLength // this throws if `array` is not a valid ArrayBuffer

  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('\'offset\' is out of bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('\'length\' is out of bounds')
  }

  if (length === undefined) {
    array = new Uint8Array(array, byteOffset)
  } else {
    array = new Uint8Array(array, byteOffset, length)
  }

  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = array
    that.__proto__ = Buffer.prototype
  } else {
    // Fallback: Return an object instance of the Buffer class
    that = fromArrayLike(that, array)
  }
  return that
}

function fromObject (that, obj) {
  if (Buffer.isBuffer(obj)) {
    var len = checked(obj.length) | 0
    that = createBuffer(that, len)

    if (that.length === 0) {
      return that
    }

    obj.copy(that, 0, 0, len)
    return that
  }

  if (obj) {
    if ((typeof ArrayBuffer !== 'undefined' &&
        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
      if (typeof obj.length !== 'number' || isnan(obj.length)) {
        return createBuffer(that, 0)
      }
      return fromArrayLike(that, obj)
    }

    if (obj.type === 'Buffer' && isArray(obj.data)) {
      return fromArrayLike(that, obj.data)
    }
  }

  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
}

function checked (length) {
  // Note: cannot use `length < kMaxLength` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= kMaxLength()) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (length) {
  if (+length != length) { // eslint-disable-line eqeqeq
    length = 0
  }
  return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer (b) {
  return !!(b != null && b._isBuffer)
}

Buffer.compare = function compare (a, b) {
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i]
      y = b[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'binary':
    case 'base64':
    case 'raw':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!isArray(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; i++) {
      length += list[i].length
    }
  }

  var buffer = Buffer.allocUnsafe(length)
  var pos = 0
  for (i = 0; i < list.length; i++) {
    var buf = list[i]
    if (!Buffer.isBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos)
    pos += buf.length
  }
  return buffer
}

function byteLength (string, encoding) {
  if (Buffer.isBuffer(string)) {
    return string.length
  }
  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    string = '' + string
  }

  var len = string.length
  if (len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'binary':
      // Deprecated
      case 'raw':
      case 'raws':
        return len
      case 'utf8':
      case 'utf-8':
      case undefined:
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) return utf8ToBytes(string).length // assume utf8
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length
  }

  if (end <= 0) {
    return ''
  }

  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0
  start >>>= 0

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8'

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'binary':
        return binarySlice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
// Buffer instances.
Buffer.prototype._isBuffer = true

function swap (b, n, m) {
  var i = b[n]
  b[n] = b[m]
  b[m] = i
}

Buffer.prototype.swap16 = function swap16 () {
  var len = this.length
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap(this, i, i + 1)
  }
  return this
}

Buffer.prototype.swap32 = function swap32 () {
  var len = this.length
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap(this, i, i + 3)
    swap(this, i + 1, i + 2)
  }
  return this
}

Buffer.prototype.toString = function toString () {
  var length = this.length | 0
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  if (this.length > 0) {
    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
    if (this.length > max) str += ' ... '
  }
  return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (!Buffer.isBuffer(target)) {
    throw new TypeError('Argument must be a Buffer')
  }

  if (start === undefined) {
    start = 0
  }
  if (end === undefined) {
    end = target ? target.length : 0
  }
  if (thisStart === undefined) {
    thisStart = 0
  }
  if (thisEnd === undefined) {
    thisEnd = this.length
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0
  end >>>= 0
  thisStart >>>= 0
  thisEnd >>>= 0

  if (this === target) return 0

  var x = thisEnd - thisStart
  var y = end - start
  var len = Math.min(x, y)

  var thisCopy = this.slice(thisStart, thisEnd)
  var targetCopy = target.slice(start, end)

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i]
      y = targetCopy[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

function arrayIndexOf (arr, val, byteOffset, encoding) {
  var indexSize = 1
  var arrLength = arr.length
  var valLength = val.length

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase()
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2
      arrLength /= 2
      valLength /= 2
      byteOffset /= 2
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var foundIndex = -1
  for (var i = 0; byteOffset + i < arrLength; i++) {
    if (read(arr, byteOffset + i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
      if (foundIndex === -1) foundIndex = i
      if (i - foundIndex + 1 === valLength) return (byteOffset + foundIndex) * indexSize
    } else {
      if (foundIndex !== -1) i -= i - foundIndex
      foundIndex = -1
    }
  }
  return -1
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  if (typeof byteOffset === 'string') {
    encoding = byteOffset
    byteOffset = 0
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000
  }
  byteOffset >>= 0

  if (this.length === 0) return -1
  if (byteOffset >= this.length) return -1

  // Negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)

  if (typeof val === 'string') {
    val = Buffer.from(val, encoding)
  }

  if (Buffer.isBuffer(val)) {
    // special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(this, val, byteOffset, encoding)
  }
  if (typeof val === 'number') {
    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
    }
    return arrayIndexOf(this, [ val ], byteOffset, encoding)
  }

  throw new TypeError('val must be string, number or Buffer')
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
}

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  // must be an even number of digits
  var strLen = string.length
  if (strLen % 2 !== 0) throw new Error('Invalid hex string')

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; i++) {
    var parsed = parseInt(string.substr(i * 2, 2), 16)
    if (isNaN(parsed)) return i
    buf[offset + i] = parsed
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function binaryWrite (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset | 0
    if (isFinite(length)) {
      length = length | 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  // legacy write(string, encoding, offset, length) - remove in v0.13
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'binary':
        return binaryWrite(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
      : (firstByte > 0xBF) ? 2
      : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; i++) {
    ret += String.fromCharCode(buf[i] & 0x7F)
  }
  return ret
}

function binarySlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; i++) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; i++) {
    out += toHex(buf[i])
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

  var newBuf
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    newBuf = this.subarray(start, end)
    newBuf.__proto__ = Buffer.prototype
  } else {
    var sliceLen = end - start
    newBuf = new Buffer(sliceLen, undefined)
    for (var i = 0; i < sliceLen; i++) {
      newBuf[i] = this[i + start]
    }
  }

  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
  this[offset] = (value & 0xff)
  return offset + 1
}

function objectWriteUInt16 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffff + value + 1
  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
      (littleEndian ? i : 1 - i) * 8
  }
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
  } else {
    objectWriteUInt16(this, value, offset, true)
  }
  return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
  } else {
    objectWriteUInt16(this, value, offset, false)
  }
  return offset + 2
}

function objectWriteUInt32 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffffffff + value + 1
  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
  }
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset + 3] = (value >>> 24)
    this[offset + 2] = (value >>> 16)
    this[offset + 1] = (value >>> 8)
    this[offset] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, true)
  }
  return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, false)
  }
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
  } else {
    objectWriteUInt16(this, value, offset, true)
  }
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
  } else {
    objectWriteUInt16(this, value, offset, false)
  }
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    this[offset + 2] = (value >>> 16)
    this[offset + 3] = (value >>> 24)
  } else {
    objectWriteUInt32(this, value, offset, true)
  }
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, false)
  }
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start
  }

  var len = end - start
  var i

  if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (i = len - 1; i >= 0; i--) {
      target[i + targetStart] = this[i + start]
    }
  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
    // ascending copy from start
    for (i = 0; i < len; i++) {
      target[i + targetStart] = this[i + start]
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, start + len),
      targetStart
    )
  }

  return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start
      start = 0
      end = this.length
    } else if (typeof end === 'string') {
      encoding = end
      end = this.length
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0)
      if (code < 256) {
        val = code
      }
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
  } else if (typeof val === 'number') {
    val = val & 255
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0
  end = end === undefined ? this.length : end >>> 0

  if (!val) val = 0

  var i
  if (typeof val === 'number') {
    for (i = start; i < end; i++) {
      this[i] = val
    }
  } else {
    var bytes = Buffer.isBuffer(val)
      ? val
      : utf8ToBytes(new Buffer(val, encoding).toString())
    var len = bytes.length
    for (i = 0; i < end - start; i++) {
      this[i + start] = bytes[i % len]
    }
  }

  return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = stringtrim(str).replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function stringtrim (str) {
  if (str.trim) return str.trim()
  return str.replace(/^\s+|\s+$/g, '')
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; i++) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; i++) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; i++) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; i++) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

function isnan (val) {
  return val !== val // eslint-disable-line no-self-compare
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"base64-js":2,"ieee754":31,"isarray":6}],6:[function(require,module,exports){
var toString = {}.toString;

module.exports = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
};

},{}],7:[function(require,module,exports){
(function (Buffer){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.

function isArray(arg) {
  if (Array.isArray) {
    return Array.isArray(arg);
  }
  return objectToString(arg) === '[object Array]';
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = Buffer.isBuffer;

function objectToString(o) {
  return Object.prototype.toString.call(o);
}

}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
},{"../../is-buffer/index.js":33}],8:[function(require,module,exports){
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (factory((global.d3_dsv = global.d3_dsv || {})));
}(this, function (exports) { 'use strict';

  var version = "0.3.2";

  function objectConverter(columns) {
    return new Function("d", "return {" + columns.map(function(name, i) {
      return JSON.stringify(name) + ": d[" + i + "]";
    }).join(",") + "}");
  }

  function customConverter(columns, f) {
    var object = objectConverter(columns);
    return function(row, i) {
      return f(object(row), i, columns);
    };
  }

  // Compute unique columns in order of discovery.
  function inferColumns(rows) {
    var columnSet = Object.create(null),
        columns = [];

    rows.forEach(function(row) {
      for (var column in row) {
        if (!(column in columnSet)) {
          columns.push(columnSet[column] = column);
        }
      }
    });

    return columns;
  }

  function dsv(delimiter) {
    var reFormat = new RegExp("[\"" + delimiter + "\n]"),
        delimiterCode = delimiter.charCodeAt(0);

    function parse(text, f) {
      var convert, columns, rows = parseRows(text, function(row, i) {
        if (convert) return convert(row, i - 1);
        columns = row, convert = f ? customConverter(row, f) : objectConverter(row);
      });
      rows.columns = columns;
      return rows;
    }

    function parseRows(text, f) {
      var EOL = {}, // sentinel value for end-of-line
          EOF = {}, // sentinel value for end-of-file
          rows = [], // output rows
          N = text.length,
          I = 0, // current character index
          n = 0, // the current line number
          t, // the current token
          eol; // is the current token followed by EOL?

      function token() {
        if (I >= N) return EOF; // special case: end of file
        if (eol) return eol = false, EOL; // special case: end of line

        // special case: quotes
        var j = I, c;
        if (text.charCodeAt(j) === 34) {
          var i = j;
          while (i++ < N) {
            if (text.charCodeAt(i) === 34) {
              if (text.charCodeAt(i + 1) !== 34) break;
              ++i;
            }
          }
          I = i + 2;
          c = text.charCodeAt(i + 1);
          if (c === 13) {
            eol = true;
            if (text.charCodeAt(i + 2) === 10) ++I;
          } else if (c === 10) {
            eol = true;
          }
          return text.slice(j + 1, i).replace(/""/g, "\"");
        }

        // common case: find next delimiter or newline
        while (I < N) {
          var k = 1;
          c = text.charCodeAt(I++);
          if (c === 10) eol = true; // \n
          else if (c === 13) { eol = true; if (text.charCodeAt(I) === 10) ++I, ++k; } // \r|\r\n
          else if (c !== delimiterCode) continue;
          return text.slice(j, I - k);
        }

        // special case: last token before EOF
        return text.slice(j);
      }

      while ((t = token()) !== EOF) {
        var a = [];
        while (t !== EOL && t !== EOF) {
          a.push(t);
          t = token();
        }
        if (f && (a = f(a, n++)) == null) continue;
        rows.push(a);
      }

      return rows;
    }

    function format(rows, columns) {
      if (columns == null) columns = inferColumns(rows);
      return [columns.map(formatValue).join(delimiter)].concat(rows.map(function(row) {
        return columns.map(function(column) {
          return formatValue(row[column]);
        }).join(delimiter);
      })).join("\n");
    }

    function formatRows(rows) {
      return rows.map(formatRow).join("\n");
    }

    function formatRow(row) {
      return row.map(formatValue).join(delimiter);
    }

    function formatValue(text) {
      return text == null ? ""
          : reFormat.test(text += "") ? "\"" + text.replace(/\"/g, "\"\"") + "\""
          : text;
    }

    return {
      parse: parse,
      parseRows: parseRows,
      format: format,
      formatRows: formatRows
    };
  }

  var csv = dsv(",");

  var csvParse = csv.parse;
  var csvParseRows = csv.parseRows;
  var csvFormat = csv.format;
  var csvFormatRows = csv.formatRows;

  var tsv = dsv("\t");

  var tsvParse = tsv.parse;
  var tsvParseRows = tsv.parseRows;
  var tsvFormat = tsv.format;
  var tsvFormatRows = tsv.formatRows;

  exports.version = version;
  exports.dsvFormat = dsv;
  exports.csvParse = csvParse;
  exports.csvParseRows = csvParseRows;
  exports.csvFormat = csvFormat;
  exports.csvFormatRows = csvFormatRows;
  exports.tsvParse = tsvParse;
  exports.tsvParseRows = tsvParseRows;
  exports.tsvFormat = tsvFormat;
  exports.tsvFormatRows = tsvFormatRows;

}));
},{}],9:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      }
      throw TypeError('Uncaught, unspecified "error" event.');
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        args = Array.prototype.slice.call(arguments, 1);
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    args = Array.prototype.slice.call(arguments, 1);
    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else if (listeners) {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.prototype.listenerCount = function(type) {
  if (this._events) {
    var evlistener = this._events[type];

    if (isFunction(evlistener))
      return 1;
    else if (evlistener)
      return evlistener.length;
  }
  return 0;
};

EventEmitter.listenerCount = function(emitter, type) {
  return emitter.listenerCount(type);
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],10:[function(require,module,exports){
(function (Buffer){
"use strict"

// Multibyte codec. In this scheme, a character is represented by 1 or more bytes.
// Our codec supports UTF-16 surrogates, extensions for GB18030 and unicode sequences.
// To save memory and loading time, we read table files only when requested.

exports._dbcs = DBCSCodec;

var UNASSIGNED = -1,
    GB18030_CODE = -2,
    SEQ_START  = -10,
    NODE_START = -1000,
    UNASSIGNED_NODE = new Array(0x100),
    DEF_CHAR = -1;

for (var i = 0; i < 0x100; i++)
    UNASSIGNED_NODE[i] = UNASSIGNED;


// Class DBCSCodec reads and initializes mapping tables.
function DBCSCodec(codecOptions, iconv) {
    this.encodingName = codecOptions.encodingName;
    if (!codecOptions)
        throw new Error("DBCS codec is called without the data.")
    if (!codecOptions.table)
        throw new Error("Encoding '" + this.encodingName + "' has no data.");

    // Load tables.
    var mappingTable = codecOptions.table();


    // Decode tables: MBCS -> Unicode.

    // decodeTables is a trie, encoded as an array of arrays of integers. Internal arrays are trie nodes and all have len = 256.
    // Trie root is decodeTables[0].
    // Values: >=  0 -> unicode character code. can be > 0xFFFF
    //         == UNASSIGNED -> unknown/unassigned sequence.
    //         == GB18030_CODE -> this is the end of a GB18030 4-byte sequence.
    //         <= NODE_START -> index of the next node in our trie to process next byte.
    //         <= SEQ_START  -> index of the start of a character code sequence, in decodeTableSeq.
    this.decodeTables = [];
    this.decodeTables[0] = UNASSIGNED_NODE.slice(0); // Create root node.

    // Sometimes a MBCS char corresponds to a sequence of unicode chars. We store them as arrays of integers here. 
    this.decodeTableSeq = [];

    // Actual mapping tables consist of chunks. Use them to fill up decode tables.
    for (var i = 0; i < mappingTable.length; i++)
        this._addDecodeChunk(mappingTable[i]);

    this.defaultCharUnicode = iconv.defaultCharUnicode;

    
    // Encode tables: Unicode -> DBCS.

    // `encodeTable` is array mapping from unicode char to encoded char. All its values are integers for performance.
    // Because it can be sparse, it is represented as array of buckets by 256 chars each. Bucket can be null.
    // Values: >=  0 -> it is a normal char. Write the value (if <=256 then 1 byte, if <=65536 then 2 bytes, etc.).
    //         == UNASSIGNED -> no conversion found. Output a default char.
    //         <= SEQ_START  -> it's an index in encodeTableSeq, see below. The character starts a sequence.
    this.encodeTable = [];
    
    // `encodeTableSeq` is used when a sequence of unicode characters is encoded as a single code. We use a tree of
    // objects where keys correspond to characters in sequence and leafs are the encoded dbcs values. A special DEF_CHAR key
    // means end of sequence (needed when one sequence is a strict subsequence of another).
    // Objects are kept separately from encodeTable to increase performance.
    this.encodeTableSeq = [];

    // Some chars can be decoded, but need not be encoded.
    var skipEncodeChars = {};
    if (codecOptions.encodeSkipVals)
        for (var i = 0; i < codecOptions.encodeSkipVals.length; i++) {
            var val = codecOptions.encodeSkipVals[i];
            if (typeof val === 'number')
                skipEncodeChars[val] = true;
            else
                for (var j = val.from; j <= val.to; j++)
                    skipEncodeChars[j] = true;
        }
        
    // Use decode trie to recursively fill out encode tables.
    this._fillEncodeTable(0, 0, skipEncodeChars);

    // Add more encoding pairs when needed.
    if (codecOptions.encodeAdd) {
        for (var uChar in codecOptions.encodeAdd)
            if (Object.prototype.hasOwnProperty.call(codecOptions.encodeAdd, uChar))
                this._setEncodeChar(uChar.charCodeAt(0), codecOptions.encodeAdd[uChar]);
    }

    this.defCharSB  = this.encodeTable[0][iconv.defaultCharSingleByte.charCodeAt(0)];
    if (this.defCharSB === UNASSIGNED) this.defCharSB = this.encodeTable[0]['?'];
    if (this.defCharSB === UNASSIGNED) this.defCharSB = "?".charCodeAt(0);


    // Load & create GB18030 tables when needed.
    if (typeof codecOptions.gb18030 === 'function') {
        this.gb18030 = codecOptions.gb18030(); // Load GB18030 ranges.

        // Add GB18030 decode tables.
        var thirdByteNodeIdx = this.decodeTables.length;
        var thirdByteNode = this.decodeTables[thirdByteNodeIdx] = UNASSIGNED_NODE.slice(0);

        var fourthByteNodeIdx = this.decodeTables.length;
        var fourthByteNode = this.decodeTables[fourthByteNodeIdx] = UNASSIGNED_NODE.slice(0);

        for (var i = 0x81; i <= 0xFE; i++) {
            var secondByteNodeIdx = NODE_START - this.decodeTables[0][i];
            var secondByteNode = this.decodeTables[secondByteNodeIdx];
            for (var j = 0x30; j <= 0x39; j++)
                secondByteNode[j] = NODE_START - thirdByteNodeIdx;
        }
        for (var i = 0x81; i <= 0xFE; i++)
            thirdByteNode[i] = NODE_START - fourthByteNodeIdx;
        for (var i = 0x30; i <= 0x39; i++)
            fourthByteNode[i] = GB18030_CODE
    }        
}

DBCSCodec.prototype.encoder = DBCSEncoder;
DBCSCodec.prototype.decoder = DBCSDecoder;

// Decoder helpers
DBCSCodec.prototype._getDecodeTrieNode = function(addr) {
    var bytes = [];
    for (; addr > 0; addr >>= 8)
        bytes.push(addr & 0xFF);
    if (bytes.length == 0)
        bytes.push(0);

    var node = this.decodeTables[0];
    for (var i = bytes.length-1; i > 0; i--) { // Traverse nodes deeper into the trie.
        var val = node[bytes[i]];

        if (val == UNASSIGNED) { // Create new node.
            node[bytes[i]] = NODE_START - this.decodeTables.length;
            this.decodeTables.push(node = UNASSIGNED_NODE.slice(0));
        }
        else if (val <= NODE_START) { // Existing node.
            node = this.decodeTables[NODE_START - val];
        }
        else
            throw new Error("Overwrite byte in " + this.encodingName + ", addr: " + addr.toString(16));
    }
    return node;
}


DBCSCodec.prototype._addDecodeChunk = function(chunk) {
    // First element of chunk is the hex mbcs code where we start.
    var curAddr = parseInt(chunk[0], 16);

    // Choose the decoding node where we'll write our chars.
    var writeTable = this._getDecodeTrieNode(curAddr);
    curAddr = curAddr & 0xFF;

    // Write all other elements of the chunk to the table.
    for (var k = 1; k < chunk.length; k++) {
        var part = chunk[k];
        if (typeof part === "string") { // String, write as-is.
            for (var l = 0; l < part.length;) {
                var code = part.charCodeAt(l++);
                if (0xD800 <= code && code < 0xDC00) { // Decode surrogate
                    var codeTrail = part.charCodeAt(l++);
                    if (0xDC00 <= codeTrail && codeTrail < 0xE000)
                        writeTable[curAddr++] = 0x10000 + (code - 0xD800) * 0x400 + (codeTrail - 0xDC00);
                    else
                        throw new Error("Incorrect surrogate pair in "  + this.encodingName + " at chunk " + chunk[0]);
                }
                else if (0x0FF0 < code && code <= 0x0FFF) { // Character sequence (our own encoding used)
                    var len = 0xFFF - code + 2;
                    var seq = [];
                    for (var m = 0; m < len; m++)
                        seq.push(part.charCodeAt(l++)); // Simple variation: don't support surrogates or subsequences in seq.

                    writeTable[curAddr++] = SEQ_START - this.decodeTableSeq.length;
                    this.decodeTableSeq.push(seq);
                }
                else
                    writeTable[curAddr++] = code; // Basic char
            }
        } 
        else if (typeof part === "number") { // Integer, meaning increasing sequence starting with prev character.
            var charCode = writeTable[curAddr - 1] + 1;
            for (var l = 0; l < part; l++)
                writeTable[curAddr++] = charCode++;
        }
        else
            throw new Error("Incorrect type '" + typeof part + "' given in "  + this.encodingName + " at chunk " + chunk[0]);
    }
    if (curAddr > 0xFF)
        throw new Error("Incorrect chunk in "  + this.encodingName + " at addr " + chunk[0] + ": too long" + curAddr);
}

// Encoder helpers
DBCSCodec.prototype._getEncodeBucket = function(uCode) {
    var high = uCode >> 8; // This could be > 0xFF because of astral characters.
    if (this.encodeTable[high] === undefined)
        this.encodeTable[high] = UNASSIGNED_NODE.slice(0); // Create bucket on demand.
    return this.encodeTable[high];
}

DBCSCodec.prototype._setEncodeChar = function(uCode, dbcsCode) {
    var bucket = this._getEncodeBucket(uCode);
    var low = uCode & 0xFF;
    if (bucket[low] <= SEQ_START)
        this.encodeTableSeq[SEQ_START-bucket[low]][DEF_CHAR] = dbcsCode; // There's already a sequence, set a single-char subsequence of it.
    else if (bucket[low] == UNASSIGNED)
        bucket[low] = dbcsCode;
}

DBCSCodec.prototype._setEncodeSequence = function(seq, dbcsCode) {
    
    // Get the root of character tree according to first character of the sequence.
    var uCode = seq[0];
    var bucket = this._getEncodeBucket(uCode);
    var low = uCode & 0xFF;

    var node;
    if (bucket[low] <= SEQ_START) {
        // There's already a sequence with  - use it.
        node = this.encodeTableSeq[SEQ_START-bucket[low]];
    }
    else {
        // There was no sequence object - allocate a new one.
        node = {};
        if (bucket[low] !== UNASSIGNED) node[DEF_CHAR] = bucket[low]; // If a char was set before - make it a single-char subsequence.
        bucket[low] = SEQ_START - this.encodeTableSeq.length;
        this.encodeTableSeq.push(node);
    }

    // Traverse the character tree, allocating new nodes as needed.
    for (var j = 1; j < seq.length-1; j++) {
        var oldVal = node[uCode];
        if (typeof oldVal === 'object')
            node = oldVal;
        else {
            node = node[uCode] = {}
            if (oldVal !== undefined)
                node[DEF_CHAR] = oldVal
        }
    }

    // Set the leaf to given dbcsCode.
    uCode = seq[seq.length-1];
    node[uCode] = dbcsCode;
}

DBCSCodec.prototype._fillEncodeTable = function(nodeIdx, prefix, skipEncodeChars) {
    var node = this.decodeTables[nodeIdx];
    for (var i = 0; i < 0x100; i++) {
        var uCode = node[i];
        var mbCode = prefix + i;
        if (skipEncodeChars[mbCode])
            continue;

        if (uCode >= 0)
            this._setEncodeChar(uCode, mbCode);
        else if (uCode <= NODE_START)
            this._fillEncodeTable(NODE_START - uCode, mbCode << 8, skipEncodeChars);
        else if (uCode <= SEQ_START)
            this._setEncodeSequence(this.decodeTableSeq[SEQ_START - uCode], mbCode);
    }
}



// == Encoder ==================================================================

function DBCSEncoder(options, codec) {
    // Encoder state
    this.leadSurrogate = -1;
    this.seqObj = undefined;
    
    // Static data
    this.encodeTable = codec.encodeTable;
    this.encodeTableSeq = codec.encodeTableSeq;
    this.defaultCharSingleByte = codec.defCharSB;
    this.gb18030 = codec.gb18030;
}

DBCSEncoder.prototype.write = function(str) {
    var newBuf = new Buffer(str.length * (this.gb18030 ? 4 : 3)), 
        leadSurrogate = this.leadSurrogate,
        seqObj = this.seqObj, nextChar = -1,
        i = 0, j = 0;

    while (true) {
        // 0. Get next character.
        if (nextChar === -1) {
            if (i == str.length) break;
            var uCode = str.charCodeAt(i++);
        }
        else {
            var uCode = nextChar;
            nextChar = -1;    
        }

        // 1. Handle surrogates.
        if (0xD800 <= uCode && uCode < 0xE000) { // Char is one of surrogates.
            if (uCode < 0xDC00) { // We've got lead surrogate.
                if (leadSurrogate === -1) {
                    leadSurrogate = uCode;
                    continue;
                } else {
                    leadSurrogate = uCode;
                    // Double lead surrogate found.
                    uCode = UNASSIGNED;
                }
            } else { // We've got trail surrogate.
                if (leadSurrogate !== -1) {
                    uCode = 0x10000 + (leadSurrogate - 0xD800) * 0x400 + (uCode - 0xDC00);
                    leadSurrogate = -1;
                } else {
                    // Incomplete surrogate pair - only trail surrogate found.
                    uCode = UNASSIGNED;
                }
                
            }
        }
        else if (leadSurrogate !== -1) {
            // Incomplete surrogate pair - only lead surrogate found.
            nextChar = uCode; uCode = UNASSIGNED; // Write an error, then current char.
            leadSurrogate = -1;
        }

        // 2. Convert uCode character.
        var dbcsCode = UNASSIGNED;
        if (seqObj !== undefined && uCode != UNASSIGNED) { // We are in the middle of the sequence
            var resCode = seqObj[uCode];
            if (typeof resCode === 'object') { // Sequence continues.
                seqObj = resCode;
                continue;

            } else if (typeof resCode == 'number') { // Sequence finished. Write it.
                dbcsCode = resCode;

            } else if (resCode == undefined) { // Current character is not part of the sequence.

                // Try default character for this sequence
                resCode = seqObj[DEF_CHAR];
                if (resCode !== undefined) {
                    dbcsCode = resCode; // Found. Write it.
                    nextChar = uCode; // Current character will be written too in the next iteration.

                } else {
                    // TODO: What if we have no default? (resCode == undefined)
                    // Then, we should write first char of the sequence as-is and try the rest recursively.
                    // Didn't do it for now because no encoding has this situation yet.
                    // Currently, just skip the sequence and write current char.
                }
            }
            seqObj = undefined;
        }
        else if (uCode >= 0) {  // Regular character
            var subtable = this.encodeTable[uCode >> 8];
            if (subtable !== undefined)
                dbcsCode = subtable[uCode & 0xFF];
            
            if (dbcsCode <= SEQ_START) { // Sequence start
                seqObj = this.encodeTableSeq[SEQ_START-dbcsCode];
                continue;
            }

            if (dbcsCode == UNASSIGNED && this.gb18030) {
                // Use GB18030 algorithm to find character(s) to write.
                var idx = findIdx(this.gb18030.uChars, uCode);
                if (idx != -1) {
                    var dbcsCode = this.gb18030.gbChars[idx] + (uCode - this.gb18030.uChars[idx]);
                    newBuf[j++] = 0x81 + Math.floor(dbcsCode / 12600); dbcsCode = dbcsCode % 12600;
                    newBuf[j++] = 0x30 + Math.floor(dbcsCode / 1260); dbcsCode = dbcsCode % 1260;
                    newBuf[j++] = 0x81 + Math.floor(dbcsCode / 10); dbcsCode = dbcsCode % 10;
                    newBuf[j++] = 0x30 + dbcsCode;
                    continue;
                }
            }
        }

        // 3. Write dbcsCode character.
        if (dbcsCode === UNASSIGNED)
            dbcsCode = this.defaultCharSingleByte;
        
        if (dbcsCode < 0x100) {
            newBuf[j++] = dbcsCode;
        }
        else if (dbcsCode < 0x10000) {
            newBuf[j++] = dbcsCode >> 8;   // high byte
            newBuf[j++] = dbcsCode & 0xFF; // low byte
        }
        else {
            newBuf[j++] = dbcsCode >> 16;
            newBuf[j++] = (dbcsCode >> 8) & 0xFF;
            newBuf[j++] = dbcsCode & 0xFF;
        }
    }

    this.seqObj = seqObj;
    this.leadSurrogate = leadSurrogate;
    return newBuf.slice(0, j);
}

DBCSEncoder.prototype.end = function() {
    if (this.leadSurrogate === -1 && this.seqObj === undefined)
        return; // All clean. Most often case.

    var newBuf = new Buffer(10), j = 0;

    if (this.seqObj) { // We're in the sequence.
        var dbcsCode = this.seqObj[DEF_CHAR];
        if (dbcsCode !== undefined) { // Write beginning of the sequence.
            if (dbcsCode < 0x100) {
                newBuf[j++] = dbcsCode;
            }
            else {
                newBuf[j++] = dbcsCode >> 8;   // high byte
                newBuf[j++] = dbcsCode & 0xFF; // low byte
            }
        } else {
            // See todo above.
        }
        this.seqObj = undefined;
    }

    if (this.leadSurrogate !== -1) {
        // Incomplete surrogate pair - only lead surrogate found.
        newBuf[j++] = this.defaultCharSingleByte;
        this.leadSurrogate = -1;
    }
    
    return newBuf.slice(0, j);
}

// Export for testing
DBCSEncoder.prototype.findIdx = findIdx;


// == Decoder ==================================================================

function DBCSDecoder(options, codec) {
    // Decoder state
    this.nodeIdx = 0;
    this.prevBuf = new Buffer(0);

    // Static data
    this.decodeTables = codec.decodeTables;
    this.decodeTableSeq = codec.decodeTableSeq;
    this.defaultCharUnicode = codec.defaultCharUnicode;
    this.gb18030 = codec.gb18030;
}

DBCSDecoder.prototype.write = function(buf) {
    var newBuf = new Buffer(buf.length*2),
        nodeIdx = this.nodeIdx, 
        prevBuf = this.prevBuf, prevBufOffset = this.prevBuf.length,
        seqStart = -this.prevBuf.length, // idx of the start of current parsed sequence.
        uCode;

    if (prevBufOffset > 0) // Make prev buf overlap a little to make it easier to slice later.
        prevBuf = Buffer.concat([prevBuf, buf.slice(0, 10)]);
    
    for (var i = 0, j = 0; i < buf.length; i++) {
        var curByte = (i >= 0) ? buf[i] : prevBuf[i + prevBufOffset];

        // Lookup in current trie node.
        var uCode = this.decodeTables[nodeIdx][curByte];

        if (uCode >= 0) { 
            // Normal character, just use it.
        }
        else if (uCode === UNASSIGNED) { // Unknown char.
            // TODO: Callback with seq.
            //var curSeq = (seqStart >= 0) ? buf.slice(seqStart, i+1) : prevBuf.slice(seqStart + prevBufOffset, i+1 + prevBufOffset);
            i = seqStart; // Try to parse again, after skipping first byte of the sequence ('i' will be incremented by 'for' cycle).
            uCode = this.defaultCharUnicode.charCodeAt(0);
        }
        else if (uCode === GB18030_CODE) {
            var curSeq = (seqStart >= 0) ? buf.slice(seqStart, i+1) : prevBuf.slice(seqStart + prevBufOffset, i+1 + prevBufOffset);
            var ptr = (curSeq[0]-0x81)*12600 + (curSeq[1]-0x30)*1260 + (curSeq[2]-0x81)*10 + (curSeq[3]-0x30);
            var idx = findIdx(this.gb18030.gbChars, ptr);
            uCode = this.gb18030.uChars[idx] + ptr - this.gb18030.gbChars[idx];
        }
        else if (uCode <= NODE_START) { // Go to next trie node.
            nodeIdx = NODE_START - uCode;
            continue;
        }
        else if (uCode <= SEQ_START) { // Output a sequence of chars.
            var seq = this.decodeTableSeq[SEQ_START - uCode];
            for (var k = 0; k < seq.length - 1; k++) {
                uCode = seq[k];
                newBuf[j++] = uCode & 0xFF;
                newBuf[j++] = uCode >> 8;
            }
            uCode = seq[seq.length-1];
        }
        else
            throw new Error("iconv-lite internal error: invalid decoding table value " + uCode + " at " + nodeIdx + "/" + curByte);

        // Write the character to buffer, handling higher planes using surrogate pair.
        if (uCode > 0xFFFF) { 
            uCode -= 0x10000;
            var uCodeLead = 0xD800 + Math.floor(uCode / 0x400);
            newBuf[j++] = uCodeLead & 0xFF;
            newBuf[j++] = uCodeLead >> 8;

            uCode = 0xDC00 + uCode % 0x400;
        }
        newBuf[j++] = uCode & 0xFF;
        newBuf[j++] = uCode >> 8;

        // Reset trie node.
        nodeIdx = 0; seqStart = i+1;
    }

    this.nodeIdx = nodeIdx;
    this.prevBuf = (seqStart >= 0) ? buf.slice(seqStart) : prevBuf.slice(seqStart + prevBufOffset);
    return newBuf.slice(0, j).toString('ucs2');
}

DBCSDecoder.prototype.end = function() {
    var ret = '';

    // Try to parse all remaining chars.
    while (this.prevBuf.length > 0) {
        // Skip 1 character in the buffer.
        ret += this.defaultCharUnicode;
        var buf = this.prevBuf.slice(1);

        // Parse remaining as usual.
        this.prevBuf = new Buffer(0);
        this.nodeIdx = 0;
        if (buf.length > 0)
            ret += this.write(buf);
    }

    this.nodeIdx = 0;
    return ret;
}

// Binary search for GB18030. Returns largest i such that table[i] <= val.
function findIdx(table, val) {
    if (table[0] > val)
        return -1;

    var l = 0, r = table.length;
    while (l < r-1) { // always table[l] <= val < table[r]
        var mid = l + Math.floor((r-l+1)/2);
        if (table[mid] <= val)
            l = mid;
        else
            r = mid;
    }
    return l;
}


}).call(this,require("buffer").Buffer)
},{"buffer":5}],11:[function(require,module,exports){
"use strict"

// Description of supported double byte encodings and aliases.
// Tables are not require()-d until they are needed to speed up library load.
// require()-s are direct to support Browserify.

module.exports = {
    
    // == Japanese/ShiftJIS ====================================================
    // All japanese encodings are based on JIS X set of standards:
    // JIS X 0201 - Single-byte encoding of ASCII + ¥ + Kana chars at 0xA1-0xDF.
    // JIS X 0208 - Main set of 6879 characters, placed in 94x94 plane, to be encoded by 2 bytes. 
    //              Has several variations in 1978, 1983, 1990 and 1997.
    // JIS X 0212 - Supplementary plane of 6067 chars in 94x94 plane. 1990. Effectively dead.
    // JIS X 0213 - Extension and modern replacement of 0208 and 0212. Total chars: 11233.
    //              2 planes, first is superset of 0208, second - revised 0212.
    //              Introduced in 2000, revised 2004. Some characters are in Unicode Plane 2 (0x2xxxx)

    // Byte encodings are:
    //  * Shift_JIS: Compatible with 0201, uses not defined chars in top half as lead bytes for double-byte
    //               encoding of 0208. Lead byte ranges: 0x81-0x9F, 0xE0-0xEF; Trail byte ranges: 0x40-0x7E, 0x80-0x9E, 0x9F-0xFC.
    //               Windows CP932 is a superset of Shift_JIS. Some companies added more chars, notably KDDI.
    //  * EUC-JP:    Up to 3 bytes per character. Used mostly on *nixes.
    //               0x00-0x7F       - lower part of 0201
    //               0x8E, 0xA1-0xDF - upper part of 0201
    //               (0xA1-0xFE)x2   - 0208 plane (94x94).
    //               0x8F, (0xA1-0xFE)x2 - 0212 plane (94x94).
    //  * JIS X 208: 7-bit, direct encoding of 0208. Byte ranges: 0x21-0x7E (94 values). Uncommon.
    //               Used as-is in ISO2022 family.
    //  * ISO2022-JP: Stateful encoding, with escape sequences to switch between ASCII, 
    //                0201-1976 Roman, 0208-1978, 0208-1983.
    //  * ISO2022-JP-1: Adds esc seq for 0212-1990.
    //  * ISO2022-JP-2: Adds esc seq for GB2313-1980, KSX1001-1992, ISO8859-1, ISO8859-7.
    //  * ISO2022-JP-3: Adds esc seq for 0201-1976 Kana set, 0213-2000 Planes 1, 2.
    //  * ISO2022-JP-2004: Adds 0213-2004 Plane 1.
    //
    // After JIS X 0213 appeared, Shift_JIS-2004, EUC-JISX0213 and ISO2022-JP-2004 followed, with just changing the planes.
    //
    // Overall, it seems that it's a mess :( http://www8.plala.or.jp/tkubota1/unicode-symbols-map2.html


    'shiftjis': {
        type: '_dbcs',
        table: function() { return require('./tables/shiftjis.json') },
        encodeAdd: {'\u00a5': 0x5C, '\u203E': 0x7E},
        encodeSkipVals: [{from: 0xED40, to: 0xF940}],
    },
    'csshiftjis': 'shiftjis',
    'mskanji': 'shiftjis',
    'sjis': 'shiftjis',
    'windows31j': 'shiftjis',
    'xsjis': 'shiftjis',
    'windows932': 'shiftjis',
    '932': 'shiftjis',
    'cp932': 'shiftjis',

    'eucjp': {
        type: '_dbcs',
        table: function() { return require('./tables/eucjp.json') },
        encodeAdd: {'\u00a5': 0x5C, '\u203E': 0x7E},
    },

    // TODO: KDDI extension to Shift_JIS
    // TODO: IBM CCSID 942 = CP932, but F0-F9 custom chars and other char changes.
    // TODO: IBM CCSID 943 = Shift_JIS = CP932 with original Shift_JIS lower 128 chars.

    // == Chinese/GBK ==========================================================
    // http://en.wikipedia.org/wiki/GBK

    // Oldest GB2312 (1981, ~7600 chars) is a subset of CP936
    'gb2312': 'cp936',
    'gb231280': 'cp936',
    'gb23121980': 'cp936',
    'csgb2312': 'cp936',
    'csiso58gb231280': 'cp936',
    'euccn': 'cp936',
    'isoir58': 'gbk',

    // Microsoft's CP936 is a subset and approximation of GBK.
    // TODO: Euro = 0x80 in cp936, but not in GBK (where it's valid but undefined)
    'windows936': 'cp936',
    '936': 'cp936',
    'cp936': {
        type: '_dbcs',
        table: function() { return require('./tables/cp936.json') },
    },

    // GBK (~22000 chars) is an extension of CP936 that added user-mapped chars and some other.
    'gbk': {
        type: '_dbcs',
        table: function() { return require('./tables/cp936.json').concat(require('./tables/gbk-added.json')) },
    },
    'xgbk': 'gbk',

    // GB18030 is an algorithmic extension of GBK.
    'gb18030': {
        type: '_dbcs',
        table: function() { return require('./tables/cp936.json').concat(require('./tables/gbk-added.json')) },
        gb18030: function() { return require('./tables/gb18030-ranges.json') },
    },

    'chinese': 'gb18030',

    // TODO: Support GB18030 (~27000 chars + whole unicode mapping, cp54936)
    // http://icu-project.org/docs/papers/gb18030.html
    // http://source.icu-project.org/repos/icu/data/trunk/charset/data/xml/gb-18030-2000.xml
    // http://www.khngai.com/chinese/charmap/tblgbk.php?page=0

    // == Korean ===============================================================
    // EUC-KR, KS_C_5601 and KS X 1001 are exactly the same.
    'windows949': 'cp949',
    '949': 'cp949',
    'cp949': {
        type: '_dbcs',
        table: function() { return require('./tables/cp949.json') },
    },

    'cseuckr': 'cp949',
    'csksc56011987': 'cp949',
    'euckr': 'cp949',
    'isoir149': 'cp949',
    'korean': 'cp949',
    'ksc56011987': 'cp949',
    'ksc56011989': 'cp949',
    'ksc5601': 'cp949',


    // == Big5/Taiwan/Hong Kong ================================================
    // There are lots of tables for Big5 and cp950. Please see the following links for history:
    // http://moztw.org/docs/big5/  http://www.haible.de/bruno/charsets/conversion-tables/Big5.html
    // Variations, in roughly number of defined chars:
    //  * Windows CP 950: Microsoft variant of Big5. Canonical: http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP950.TXT
    //  * Windows CP 951: Microsoft variant of Big5-HKSCS-2001. Seems to be never public. http://me.abelcheung.org/articles/research/what-is-cp951/
    //  * Big5-2003 (Taiwan standard) almost superset of cp950.
    //  * Unicode-at-on (UAO) / Mozilla 1.8. Falling out of use on the Web. Not supported by other browsers.
    //  * Big5-HKSCS (-2001, -2004, -2008). Hong Kong standard. 
    //    many unicode code points moved from PUA to Supplementary plane (U+2XXXX) over the years.
    //    Plus, it has 4 combining sequences.
    //    Seems that Mozilla refused to support it for 10 yrs. https://bugzilla.mozilla.org/show_bug.cgi?id=162431 https://bugzilla.mozilla.org/show_bug.cgi?id=310299
    //    because big5-hkscs is the only encoding to include astral characters in non-algorithmic way.
    //    Implementations are not consistent within browsers; sometimes labeled as just big5.
    //    MS Internet Explorer switches from big5 to big5-hkscs when a patch applied.
    //    Great discussion & recap of what's going on https://bugzilla.mozilla.org/show_bug.cgi?id=912470#c31
    //    In the encoder, it might make sense to support encoding old PUA mappings to Big5 bytes seq-s.
    //    Official spec: http://www.ogcio.gov.hk/en/business/tech_promotion/ccli/terms/doc/2003cmp_2008.txt
    //                   http://www.ogcio.gov.hk/tc/business/tech_promotion/ccli/terms/doc/hkscs-2008-big5-iso.txt
    // 
    // Current understanding of how to deal with Big5(-HKSCS) is in the Encoding Standard, http://encoding.spec.whatwg.org/#big5-encoder
    // Unicode mapping (http://www.unicode.org/Public/MAPPINGS/OBSOLETE/EASTASIA/OTHER/BIG5.TXT) is said to be wrong.

    'windows950': 'cp950',
    '950': 'cp950',
    'cp950': {
        type: '_dbcs',
        table: function() { return require('./tables/cp950.json') },
    },

    // Big5 has many variations and is an extension of cp950. We use Encoding Standard's as a consensus.
    'big5': 'big5hkscs',
    'big5hkscs': {
        type: '_dbcs',
        table: function() { return require('./tables/cp950.json').concat(require('./tables/big5-added.json')) },
        encodeSkipVals: [0xa2cc],
    },

    'cnbig5': 'big5hkscs',
    'csbig5': 'big5hkscs',
    'xxbig5': 'big5hkscs',

};

},{"./tables/big5-added.json":17,"./tables/cp936.json":18,"./tables/cp949.json":19,"./tables/cp950.json":20,"./tables/eucjp.json":21,"./tables/gb18030-ranges.json":22,"./tables/gbk-added.json":23,"./tables/shiftjis.json":24}],12:[function(require,module,exports){
"use strict"

// Update this array if you add/rename/remove files in this directory.
// We support Browserify by skipping automatic module discovery and requiring modules directly.
var modules = [
    require("./internal"),
    require("./utf16"),
    require("./utf7"),
    require("./sbcs-codec"),
    require("./sbcs-data"),
    require("./sbcs-data-generated"),
    require("./dbcs-codec"),
    require("./dbcs-data"),
];

// Put all encoding/alias/codec definitions to single object and export it. 
for (var i = 0; i < modules.length; i++) {
    var module = modules[i];
    for (var enc in module)
        if (Object.prototype.hasOwnProperty.call(module, enc))
            exports[enc] = module[enc];
}

},{"./dbcs-codec":10,"./dbcs-data":11,"./internal":13,"./sbcs-codec":14,"./sbcs-data":16,"./sbcs-data-generated":15,"./utf16":25,"./utf7":26}],13:[function(require,module,exports){
(function (Buffer){
"use strict"

// Export Node.js internal encodings.

module.exports = {
    // Encodings
    utf8:   { type: "_internal", bomAware: true},
    cesu8:  { type: "_internal", bomAware: true},
    unicode11utf8: "utf8",

    ucs2:   { type: "_internal", bomAware: true},
    utf16le: "ucs2",

    binary: { type: "_internal" },
    base64: { type: "_internal" },
    hex:    { type: "_internal" },

    // Codec.
    _internal: InternalCodec,
};

//------------------------------------------------------------------------------

function InternalCodec(codecOptions, iconv) {
    this.enc = codecOptions.encodingName;
    this.bomAware = codecOptions.bomAware;

    if (this.enc === "base64")
        this.encoder = InternalEncoderBase64;
    else if (this.enc === "cesu8") {
        this.enc = "utf8"; // Use utf8 for decoding.
        this.encoder = InternalEncoderCesu8;

        // Add decoder for versions of Node not supporting CESU-8
        if (new Buffer("eda080", 'hex').toString().length == 3) {
            this.decoder = InternalDecoderCesu8;
            this.defaultCharUnicode = iconv.defaultCharUnicode;
        }
    }
}

InternalCodec.prototype.encoder = InternalEncoder;
InternalCodec.prototype.decoder = InternalDecoder;

//------------------------------------------------------------------------------

// We use node.js internal decoder. Its signature is the same as ours.
var StringDecoder = require('string_decoder').StringDecoder;

if (!StringDecoder.prototype.end) // Node v0.8 doesn't have this method.
    StringDecoder.prototype.end = function() {};


function InternalDecoder(options, codec) {
    StringDecoder.call(this, codec.enc);
}

InternalDecoder.prototype = StringDecoder.prototype;


//------------------------------------------------------------------------------
// Encoder is mostly trivial

function InternalEncoder(options, codec) {
    this.enc = codec.enc;
}

InternalEncoder.prototype.write = function(str) {
    return new Buffer(str, this.enc);
}

InternalEncoder.prototype.end = function() {
}


//------------------------------------------------------------------------------
// Except base64 encoder, which must keep its state.

function InternalEncoderBase64(options, codec) {
    this.prevStr = '';
}

InternalEncoderBase64.prototype.write = function(str) {
    str = this.prevStr + str;
    var completeQuads = str.length - (str.length % 4);
    this.prevStr = str.slice(completeQuads);
    str = str.slice(0, completeQuads);

    return new Buffer(str, "base64");
}

InternalEncoderBase64.prototype.end = function() {
    return new Buffer(this.prevStr, "base64");
}


//------------------------------------------------------------------------------
// CESU-8 encoder is also special.

function InternalEncoderCesu8(options, codec) {
}

InternalEncoderCesu8.prototype.write = function(str) {
    var buf = new Buffer(str.length * 3), bufIdx = 0;
    for (var i = 0; i < str.length; i++) {
        var charCode = str.charCodeAt(i);
        // Naive implementation, but it works because CESU-8 is especially easy
        // to convert from UTF-16 (which all JS strings are encoded in).
        if (charCode < 0x80)
            buf[bufIdx++] = charCode;
        else if (charCode < 0x800) {
            buf[bufIdx++] = 0xC0 + (charCode >>> 6);
            buf[bufIdx++] = 0x80 + (charCode & 0x3f);
        }
        else { // charCode will always be < 0x10000 in javascript.
            buf[bufIdx++] = 0xE0 + (charCode >>> 12);
            buf[bufIdx++] = 0x80 + ((charCode >>> 6) & 0x3f);
            buf[bufIdx++] = 0x80 + (charCode & 0x3f);
        }
    }
    return buf.slice(0, bufIdx);
}

InternalEncoderCesu8.prototype.end = function() {
}

//------------------------------------------------------------------------------
// CESU-8 decoder is not implemented in Node v4.0+

function InternalDecoderCesu8(options, codec) {
    this.acc = 0;
    this.contBytes = 0;
    this.accBytes = 0;
    this.defaultCharUnicode = codec.defaultCharUnicode;
}

InternalDecoderCesu8.prototype.write = function(buf) {
    var acc = this.acc, contBytes = this.contBytes, accBytes = this.accBytes, 
        res = '';
    for (var i = 0; i < buf.length; i++) {
        var curByte = buf[i];
        if ((curByte & 0xC0) !== 0x80) { // Leading byte
            if (contBytes > 0) { // Previous code is invalid
                res += this.defaultCharUnicode;
                contBytes = 0;
            }

            if (curByte < 0x80) { // Single-byte code
                res += String.fromCharCode(curByte);
            } else if (curByte < 0xE0) { // Two-byte code
                acc = curByte & 0x1F;
                contBytes = 1; accBytes = 1;
            } else if (curByte < 0xF0) { // Three-byte code
                acc = curByte & 0x0F;
                contBytes = 2; accBytes = 1;
            } else { // Four or more are not supported for CESU-8.
                res += this.defaultCharUnicode;
            }
        } else { // Continuation byte
            if (contBytes > 0) { // We're waiting for it.
                acc = (acc << 6) | (curByte & 0x3f);
                contBytes--; accBytes++;
                if (contBytes === 0) {
                    // Check for overlong encoding, but support Modified UTF-8 (encoding NULL as C0 80)
                    if (accBytes === 2 && acc < 0x80 && acc > 0)
                        res += this.defaultCharUnicode;
                    else if (accBytes === 3 && acc < 0x800)
                        res += this.defaultCharUnicode;
                    else
                        // Actually add character.
                        res += String.fromCharCode(acc);
                }
            } else { // Unexpected continuation byte
                res += this.defaultCharUnicode;
            }
        }
    }
    this.acc = acc; this.contBytes = contBytes; this.accBytes = accBytes;
    return res;
}

InternalDecoderCesu8.prototype.end = function() {
    var res = 0;
    if (this.contBytes > 0)
        res += this.defaultCharUnicode;
    return res;
}

}).call(this,require("buffer").Buffer)
},{"buffer":5,"string_decoder":58}],14:[function(require,module,exports){
(function (Buffer){
"use strict"

// Single-byte codec. Needs a 'chars' string parameter that contains 256 or 128 chars that
// correspond to encoded bytes (if 128 - then lower half is ASCII). 

exports._sbcs = SBCSCodec;
function SBCSCodec(codecOptions, iconv) {
    if (!codecOptions)
        throw new Error("SBCS codec is called without the data.")
    
    // Prepare char buffer for decoding.
    if (!codecOptions.chars || (codecOptions.chars.length !== 128 && codecOptions.chars.length !== 256))
        throw new Error("Encoding '"+codecOptions.type+"' has incorrect 'chars' (must be of len 128 or 256)");
    
    if (codecOptions.chars.length === 128) {
        var asciiString = "";
        for (var i = 0; i < 128; i++)
            asciiString += String.fromCharCode(i);
        codecOptions.chars = asciiString + codecOptions.chars;
    }

    this.decodeBuf = new Buffer(codecOptions.chars, 'ucs2');
    
    // Encoding buffer.
    var encodeBuf = new Buffer(65536);
    encodeBuf.fill(iconv.defaultCharSingleByte.charCodeAt(0));

    for (var i = 0; i < codecOptions.chars.length; i++)
        encodeBuf[codecOptions.chars.charCodeAt(i)] = i;

    this.encodeBuf = encodeBuf;
}

SBCSCodec.prototype.encoder = SBCSEncoder;
SBCSCodec.prototype.decoder = SBCSDecoder;


function SBCSEncoder(options, codec) {
    this.encodeBuf = codec.encodeBuf;
}

SBCSEncoder.prototype.write = function(str) {
    var buf = new Buffer(str.length);
    for (var i = 0; i < str.length; i++)
        buf[i] = this.encodeBuf[str.charCodeAt(i)];
    
    return buf;
}

SBCSEncoder.prototype.end = function() {
}


function SBCSDecoder(options, codec) {
    this.decodeBuf = codec.decodeBuf;
}

SBCSDecoder.prototype.write = function(buf) {
    // Strings are immutable in JS -> we use ucs2 buffer to speed up computations.
    var decodeBuf = this.decodeBuf;
    var newBuf = new Buffer(buf.length*2);
    var idx1 = 0, idx2 = 0;
    for (var i = 0; i < buf.length; i++) {
        idx1 = buf[i]*2; idx2 = i*2;
        newBuf[idx2] = decodeBuf[idx1];
        newBuf[idx2+1] = decodeBuf[idx1+1];
    }
    return newBuf.toString('ucs2');
}

SBCSDecoder.prototype.end = function() {
}

}).call(this,require("buffer").Buffer)
},{"buffer":5}],15:[function(require,module,exports){
"use strict"

// Generated data for sbcs codec. Don't edit manually. Regenerate using generation/gen-sbcs.js script.
module.exports = {
  "437": "cp437",
  "737": "cp737",
  "775": "cp775",
  "850": "cp850",
  "852": "cp852",
  "855": "cp855",
  "856": "cp856",
  "857": "cp857",
  "858": "cp858",
  "860": "cp860",
  "861": "cp861",
  "862": "cp862",
  "863": "cp863",
  "864": "cp864",
  "865": "cp865",
  "866": "cp866",
  "869": "cp869",
  "874": "windows874",
  "922": "cp922",
  "1046": "cp1046",
  "1124": "cp1124",
  "1125": "cp1125",
  "1129": "cp1129",
  "1133": "cp1133",
  "1161": "cp1161",
  "1162": "cp1162",
  "1163": "cp1163",
  "1250": "windows1250",
  "1251": "windows1251",
  "1252": "windows1252",
  "1253": "windows1253",
  "1254": "windows1254",
  "1255": "windows1255",
  "1256": "windows1256",
  "1257": "windows1257",
  "1258": "windows1258",
  "28591": "iso88591",
  "28592": "iso88592",
  "28593": "iso88593",
  "28594": "iso88594",
  "28595": "iso88595",
  "28596": "iso88596",
  "28597": "iso88597",
  "28598": "iso88598",
  "28599": "iso88599",
  "28600": "iso885910",
  "28601": "iso885911",
  "28603": "iso885913",
  "28604": "iso885914",
  "28605": "iso885915",
  "28606": "iso885916",
  "windows874": {
    "type": "_sbcs",
    "chars": "€����…�����������‘’“”•–—�������� กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู����฿เแโใไๅๆ็่้๊๋์ํ๎๏๐๑๒๓๔๕๖๗๘๙๚๛����"
  },
  "win874": "windows874",
  "cp874": "windows874",
  "windows1250": {
    "type": "_sbcs",
    "chars": "€�‚�„…†‡�‰Š‹ŚŤŽŹ�‘’“”•–—�™š›śťžź ˇ˘Ł¤Ą¦§¨©Ş«¬­®Ż°±˛ł´µ¶·¸ąş»Ľ˝ľżŔÁÂĂÄĹĆÇČÉĘËĚÍÎĎĐŃŇÓÔŐÖ×ŘŮÚŰÜÝŢßŕáâăäĺćçčéęëěíîďđńňóôőö÷řůúűüýţ˙"
  },
  "win1250": "windows1250",
  "cp1250": "windows1250",
  "windows1251": {
    "type": "_sbcs",
    "chars": "ЂЃ‚ѓ„…†‡€‰Љ‹ЊЌЋЏђ‘’“”•–—�™љ›њќћџ ЎўЈ¤Ґ¦§Ё©Є«¬­®Ї°±Ііґµ¶·ё№є»јЅѕїАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя"
  },
  "win1251": "windows1251",
  "cp1251": "windows1251",
  "windows1252": {
    "type": "_sbcs",
    "chars": "€�‚ƒ„…†‡ˆ‰Š‹Œ�Ž��‘’“”•–—˜™š›œ�žŸ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
  },
  "win1252": "windows1252",
  "cp1252": "windows1252",
  "windows1253": {
    "type": "_sbcs",
    "chars": "€�‚ƒ„…†‡�‰�‹�����‘’“”•–—�™�›���� ΅Ά£¤¥¦§¨©�«¬­®―°±²³΄µ¶·ΈΉΊ»Ό½ΎΏΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡ�ΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋόύώ�"
  },
  "win1253": "windows1253",
  "cp1253": "windows1253",
  "windows1254": {
    "type": "_sbcs",
    "chars": "€�‚ƒ„…†‡ˆ‰Š‹Œ����‘’“”•–—˜™š›œ��Ÿ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏĞÑÒÓÔÕÖ×ØÙÚÛÜİŞßàáâãäåæçèéêëìíîïğñòóôõö÷øùúûüışÿ"
  },
  "win1254": "windows1254",
  "cp1254": "windows1254",
  "windows1255": {
    "type": "_sbcs",
    "chars": "€�‚ƒ„…†‡ˆ‰�‹�����‘’“”•–—˜™�›���� ¡¢£₪¥¦§¨©×«¬­®¯°±²³´µ¶·¸¹÷»¼½¾¿ְֱֲֳִֵֶַָֹ�ֻּֽ־ֿ׀ׁׂ׃װױײ׳״�������אבגדהוזחטיךכלםמןנסעףפץצקרשת��‎‏�"
  },
  "win1255": "windows1255",
  "cp1255": "windows1255",
  "windows1256": {
    "type": "_sbcs",
    "chars": "€پ‚ƒ„…†‡ˆ‰ٹ‹Œچژڈگ‘’“”•–—ک™ڑ›œ‌‍ں ،¢£¤¥¦§¨©ھ«¬­®¯°±²³´µ¶·¸¹؛»¼½¾؟ہءآأؤإئابةتثجحخدذرزسشصض×طظعغـفقكàلâمنهوçèéêëىيîïًٌٍَôُِ÷ّùْûü‎‏ے"
  },
  "win1256": "windows1256",
  "cp1256": "windows1256",
  "windows1257": {
    "type": "_sbcs",
    "chars": "€�‚�„…†‡�‰�‹�¨ˇ¸�‘’“”•–—�™�›�¯˛� �¢£¤�¦§Ø©Ŗ«¬­®Æ°±²³´µ¶·ø¹ŗ»¼½¾æĄĮĀĆÄÅĘĒČÉŹĖĢĶĪĻŠŃŅÓŌÕÖ×ŲŁŚŪÜŻŽßąįāćäåęēčéźėģķīļšńņóōõö÷ųłśūüżž˙"
  },
  "win1257": "windows1257",
  "cp1257": "windows1257",
  "windows1258": {
    "type": "_sbcs",
    "chars": "€�‚ƒ„…†‡ˆ‰�‹Œ����‘’“”•–—˜™�›œ��Ÿ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂĂÄÅÆÇÈÉÊË̀ÍÎÏĐÑ̉ÓÔƠÖ×ØÙÚÛÜỮßàáâăäåæçèéêë́íîïđṇ̃óôơö÷øùúûüư₫ÿ"
  },
  "win1258": "windows1258",
  "cp1258": "windows1258",
  "iso88591": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
  },
  "cp28591": "iso88591",
  "iso88592": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ Ą˘Ł¤ĽŚ§¨ŠŞŤŹ­ŽŻ°ą˛ł´ľśˇ¸šşťź˝žżŔÁÂĂÄĹĆÇČÉĘËĚÍÎĎĐŃŇÓÔŐÖ×ŘŮÚŰÜÝŢßŕáâăäĺćçčéęëěíîďđńňóôőö÷řůúűüýţ˙"
  },
  "cp28592": "iso88592",
  "iso88593": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ Ħ˘£¤�Ĥ§¨İŞĞĴ­�Ż°ħ²³´µĥ·¸ışğĵ½�żÀÁÂ�ÄĊĈÇÈÉÊËÌÍÎÏ�ÑÒÓÔĠÖ×ĜÙÚÛÜŬŜßàáâ�äċĉçèéêëìíîï�ñòóôġö÷ĝùúûüŭŝ˙"
  },
  "cp28593": "iso88593",
  "iso88594": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ĄĸŖ¤ĨĻ§¨ŠĒĢŦ­Ž¯°ą˛ŗ´ĩļˇ¸šēģŧŊžŋĀÁÂÃÄÅÆĮČÉĘËĖÍÎĪĐŅŌĶÔÕÖ×ØŲÚÛÜŨŪßāáâãäåæįčéęëėíîīđņōķôõö÷øųúûüũū˙"
  },
  "cp28594": "iso88594",
  "iso88595": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ЁЂЃЄЅІЇЈЉЊЋЌ­ЎЏАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя№ёђѓєѕіїјљњћќ§ўџ"
  },
  "cp28595": "iso88595",
  "iso88596": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ���¤�������،­�������������؛���؟�ءآأؤإئابةتثجحخدذرزسشصضطظعغ�����ـفقكلمنهوىيًٌٍَُِّْ�������������"
  },
  "cp28596": "iso88596",
  "iso88597": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ‘’£€₯¦§¨©ͺ«¬­�―°±²³΄΅Ά·ΈΉΊ»Ό½ΎΏΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡ�ΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋόύώ�"
  },
  "cp28597": "iso88597",
  "iso88598": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ �¢£¤¥¦§¨©×«¬­®¯°±²³´µ¶·¸¹÷»¼½¾��������������������������������‗אבגדהוזחטיךכלםמןנסעףפץצקרשת��‎‏�"
  },
  "cp28598": "iso88598",
  "iso88599": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏĞÑÒÓÔÕÖ×ØÙÚÛÜİŞßàáâãäåæçèéêëìíîïğñòóôõö÷øùúûüışÿ"
  },
  "cp28599": "iso88599",
  "iso885910": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ĄĒĢĪĨĶ§ĻĐŠŦŽ­ŪŊ°ąēģīĩķ·ļđšŧž―ūŋĀÁÂÃÄÅÆĮČÉĘËĖÍÎÏÐŅŌÓÔÕÖŨØŲÚÛÜÝÞßāáâãäåæįčéęëėíîïðņōóôõöũøųúûüýþĸ"
  },
  "cp28600": "iso885910",
  "iso885911": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู����฿เแโใไๅๆ็่้๊๋์ํ๎๏๐๑๒๓๔๕๖๗๘๙๚๛����"
  },
  "cp28601": "iso885911",
  "iso885913": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ”¢£¤„¦§Ø©Ŗ«¬­®Æ°±²³“µ¶·ø¹ŗ»¼½¾æĄĮĀĆÄÅĘĒČÉŹĖĢĶĪĻŠŃŅÓŌÕÖ×ŲŁŚŪÜŻŽßąįāćäåęēčéźėģķīļšńņóōõö÷ųłśūüżž’"
  },
  "cp28603": "iso885913",
  "iso885914": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ Ḃḃ£ĊċḊ§Ẁ©ẂḋỲ­®ŸḞḟĠġṀṁ¶ṖẁṗẃṠỳẄẅṡÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏŴÑÒÓÔÕÖṪØÙÚÛÜÝŶßàáâãäåæçèéêëìíîïŵñòóôõöṫøùúûüýŷÿ"
  },
  "cp28604": "iso885914",
  "iso885915": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£€¥Š§š©ª«¬­®¯°±²³Žµ¶·ž¹º»ŒœŸ¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
  },
  "cp28605": "iso885915",
  "iso885916": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ĄąŁ€„Š§š©Ș«Ź­źŻ°±ČłŽ”¶·žčș»ŒœŸżÀÁÂĂÄĆÆÇÈÉÊËÌÍÎÏĐŃÒÓÔŐÖŚŰÙÚÛÜĘȚßàáâăäćæçèéêëìíîïđńòóôőöśűùúûüęțÿ"
  },
  "cp28606": "iso885916",
  "cp437": {
    "type": "_sbcs",
    "chars": "ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜ¢£¥₧ƒáíóúñѪº¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ "
  },
  "ibm437": "cp437",
  "csibm437": "cp437",
  "cp737": {
    "type": "_sbcs",
    "chars": "ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩαβγδεζηθικλμνξοπρσςτυφχψ░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀ωάέήϊίόύϋώΆΈΉΊΌΎΏ±≥≤ΪΫ÷≈°∙·√ⁿ²■ "
  },
  "ibm737": "cp737",
  "csibm737": "cp737",
  "cp775": {
    "type": "_sbcs",
    "chars": "ĆüéāäģåćłēŖŗīŹÄÅÉæÆōöĢ¢ŚśÖÜø£ØפĀĪóŻżź”¦©®¬½¼Ł«»░▒▓│┤ĄČĘĖ╣║╗╝ĮŠ┐└┴┬├─┼ŲŪ╚╔╩╦╠═╬Žąčęėįšųūž┘┌█▄▌▐▀ÓßŌŃõÕµńĶķĻļņĒŅ’­±“¾¶§÷„°∙·¹³²■ "
  },
  "ibm775": "cp775",
  "csibm775": "cp775",
  "cp850": {
    "type": "_sbcs",
    "chars": "ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜø£Ø׃áíóúñѪº¿®¬½¼¡«»░▒▓│┤ÁÂÀ©╣║╗╝¢¥┐└┴┬├─┼ãÃ╚╔╩╦╠═╬¤ðÐÊËÈıÍÎÏ┘┌█▄¦Ì▀ÓßÔÒõÕµþÞÚÛÙýݯ´­±‗¾¶§÷¸°¨·¹³²■ "
  },
  "ibm850": "cp850",
  "csibm850": "cp850",
  "cp852": {
    "type": "_sbcs",
    "chars": "ÇüéâäůćçłëŐőîŹÄĆÉĹĺôöĽľŚśÖÜŤťŁ×čáíóúĄąŽžĘ꬟Ⱥ«»░▒▓│┤ÁÂĚŞ╣║╗╝Żż┐└┴┬├─┼Ăă╚╔╩╦╠═╬¤đĐĎËďŇÍÎě┘┌█▄ŢŮ▀ÓßÔŃńňŠšŔÚŕŰýÝţ´­˝˛ˇ˘§÷¸°¨˙űŘř■ "
  },
  "ibm852": "cp852",
  "csibm852": "cp852",
  "cp855": {
    "type": "_sbcs",
    "chars": "ђЂѓЃёЁєЄѕЅіІїЇјЈљЉњЊћЋќЌўЎџЏюЮъЪаАбБцЦдДеЕфФгГ«»░▒▓│┤хХиИ╣║╗╝йЙ┐└┴┬├─┼кК╚╔╩╦╠═╬¤лЛмМнНоОп┘┌█▄Пя▀ЯрРсСтТуУжЖвВьЬ№­ыЫзЗшШэЭщЩчЧ§■ "
  },
  "ibm855": "cp855",
  "csibm855": "cp855",
  "cp856": {
    "type": "_sbcs",
    "chars": "אבגדהוזחטיךכלםמןנסעףפץצקרשת�£�×����������®¬½¼�«»░▒▓│┤���©╣║╗╝¢¥┐└┴┬├─┼��╚╔╩╦╠═╬¤���������┘┌█▄¦�▀������µ�������¯´­±‗¾¶§÷¸°¨·¹³²■ "
  },
  "ibm856": "cp856",
  "csibm856": "cp856",
  "cp857": {
    "type": "_sbcs",
    "chars": "ÇüéâäàåçêëèïîıÄÅÉæÆôöòûùİÖÜø£ØŞşáíóúñÑĞ𿮬½¼¡«»░▒▓│┤ÁÂÀ©╣║╗╝¢¥┐└┴┬├─┼ãÃ╚╔╩╦╠═╬¤ºªÊËÈ�ÍÎÏ┘┌█▄¦Ì▀ÓßÔÒõÕµ�×ÚÛÙìÿ¯´­±�¾¶§÷¸°¨·¹³²■ "
  },
  "ibm857": "cp857",
  "csibm857": "cp857",
  "cp858": {
    "type": "_sbcs",
    "chars": "ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜø£Ø׃áíóúñѪº¿®¬½¼¡«»░▒▓│┤ÁÂÀ©╣║╗╝¢¥┐└┴┬├─┼ãÃ╚╔╩╦╠═╬¤ðÐÊËÈ€ÍÎÏ┘┌█▄¦Ì▀ÓßÔÒõÕµþÞÚÛÙýݯ´­±‗¾¶§÷¸°¨·¹³²■ "
  },
  "ibm858": "cp858",
  "csibm858": "cp858",
  "cp860": {
    "type": "_sbcs",
    "chars": "ÇüéâãàÁçêÊèÍÔìÃÂÉÀÈôõòÚùÌÕÜ¢£Ù₧ÓáíóúñѪº¿Ò¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ "
  },
  "ibm860": "cp860",
  "csibm860": "cp860",
  "cp861": {
    "type": "_sbcs",
    "chars": "ÇüéâäàåçêëèÐðÞÄÅÉæÆôöþûÝýÖÜø£Ø₧ƒáíóúÁÍÓÚ¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ "
  },
  "ibm861": "cp861",
  "csibm861": "cp861",
  "cp862": {
    "type": "_sbcs",
    "chars": "אבגדהוזחטיךכלםמןנסעףפץצקרשת¢£¥₧ƒáíóúñѪº¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ "
  },
  "ibm862": "cp862",
  "csibm862": "cp862",
  "cp863": {
    "type": "_sbcs",
    "chars": "ÇüéâÂà¶çêëèïî‗À§ÉÈÊôËÏûù¤ÔÜ¢£ÙÛƒ¦´óú¨¸³¯Î⌐¬½¼¾«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ "
  },
  "ibm863": "cp863",
  "csibm863": "cp863",
  "cp864": {
    "type": "_sbcs",
    "chars": "\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f !\"#$٪&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~°·∙√▒─│┼┤┬├┴┐┌└┘β∞φ±½¼≈«»ﻷﻸ��ﻻﻼ� ­ﺂ£¤ﺄ��ﺎﺏﺕﺙ،ﺝﺡﺥ٠١٢٣٤٥٦٧٨٩ﻑ؛ﺱﺵﺹ؟¢ﺀﺁﺃﺅﻊﺋﺍﺑﺓﺗﺛﺟﺣﺧﺩﺫﺭﺯﺳﺷﺻﺿﻁﻅﻋﻏ¦¬÷×ﻉـﻓﻗﻛﻟﻣﻧﻫﻭﻯﻳﺽﻌﻎﻍﻡﹽّﻥﻩﻬﻰﻲﻐﻕﻵﻶﻝﻙﻱ■�"
  },
  "ibm864": "cp864",
  "csibm864": "cp864",
  "cp865": {
    "type": "_sbcs",
    "chars": "ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜø£Ø₧ƒáíóúñѪº¿⌐¬½¼¡«¤░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ "
  },
  "ibm865": "cp865",
  "csibm865": "cp865",
  "cp866": {
    "type": "_sbcs",
    "chars": "АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмноп░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀рстуфхцчшщъыьэюяЁёЄєЇїЎў°∙·√№¤■ "
  },
  "ibm866": "cp866",
  "csibm866": "cp866",
  "cp869": {
    "type": "_sbcs",
    "chars": "������Ά�·¬¦‘’Έ―ΉΊΪΌ��ΎΫ©Ώ²³ά£έήίϊΐόύΑΒΓΔΕΖΗ½ΘΙ«»░▒▓│┤ΚΛΜΝ╣║╗╝ΞΟ┐└┴┬├─┼ΠΡ╚╔╩╦╠═╬ΣΤΥΦΧΨΩαβγ┘┌█▄δε▀ζηθικλμνξοπρσςτ΄­±υφχ§ψ΅°¨ωϋΰώ■ "
  },
  "ibm869": "cp869",
  "csibm869": "cp869",
  "cp922": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§¨©ª«¬­®‾°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏŠÑÒÓÔÕÖ×ØÙÚÛÜÝŽßàáâãäåæçèéêëìíîïšñòóôõö÷øùúûüýžÿ"
  },
  "ibm922": "cp922",
  "csibm922": "cp922",
  "cp1046": {
    "type": "_sbcs",
    "chars": "ﺈ×÷ﹱˆ■│─┐┌└┘ﹹﹻﹽﹿﹷﺊﻰﻳﻲﻎﻏﻐﻶﻸﻺﻼ ¤ﺋﺑﺗﺛﺟﺣ،­ﺧﺳ٠١٢٣٤٥٦٧٨٩ﺷ؛ﺻﺿﻊ؟ﻋءآأؤإئابةتثجحخدذرزسشصضطﻇعغﻌﺂﺄﺎﻓـفقكلمنهوىيًٌٍَُِّْﻗﻛﻟﻵﻷﻹﻻﻣﻧﻬﻩ�"
  },
  "ibm1046": "cp1046",
  "csibm1046": "cp1046",
  "cp1124": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ЁЂҐЄЅІЇЈЉЊЋЌ­ЎЏАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя№ёђґєѕіїјљњћќ§ўџ"
  },
  "ibm1124": "cp1124",
  "csibm1124": "cp1124",
  "cp1125": {
    "type": "_sbcs",
    "chars": "АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмноп░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀рстуфхцчшщъыьэюяЁёҐґЄєІіЇї·√№¤■ "
  },
  "ibm1125": "cp1125",
  "csibm1125": "cp1125",
  "cp1129": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§œ©ª«¬­®¯°±²³Ÿµ¶·Œ¹º»¼½¾¿ÀÁÂĂÄÅÆÇÈÉÊË̀ÍÎÏĐÑ̉ÓÔƠÖ×ØÙÚÛÜỮßàáâăäåæçèéêë́íîïđṇ̃óôơö÷øùúûüư₫ÿ"
  },
  "ibm1129": "cp1129",
  "csibm1129": "cp1129",
  "cp1133": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ກຂຄງຈສຊຍດຕຖທນບປຜຝພຟມຢຣລວຫອຮ���ຯະາຳິີຶືຸູຼັົຽ���ເແໂໃໄ່້໊໋໌ໍໆ�ໜໝ₭����������������໐໑໒໓໔໕໖໗໘໙��¢¬¦�"
  },
  "ibm1133": "cp1133",
  "csibm1133": "cp1133",
  "cp1161": {
    "type": "_sbcs",
    "chars": "��������������������������������่กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู้๊๋€฿เแโใไๅๆ็่้๊๋์ํ๎๏๐๑๒๓๔๕๖๗๘๙๚๛¢¬¦ "
  },
  "ibm1161": "cp1161",
  "csibm1161": "cp1161",
  "cp1162": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู����฿เแโใไๅๆ็่้๊๋์ํ๎๏๐๑๒๓๔๕๖๗๘๙๚๛����"
  },
  "ibm1162": "cp1162",
  "csibm1162": "cp1162",
  "cp1163": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£€¥¦§œ©ª«¬­®¯°±²³Ÿµ¶·Œ¹º»¼½¾¿ÀÁÂĂÄÅÆÇÈÉÊË̀ÍÎÏĐÑ̉ÓÔƠÖ×ØÙÚÛÜỮßàáâăäåæçèéêë́íîïđṇ̃óôơö÷øùúûüư₫ÿ"
  },
  "ibm1163": "cp1163",
  "csibm1163": "cp1163",
  "maccroatian": {
    "type": "_sbcs",
    "chars": "ÄÅÇÉÑÖÜáàâäãåçéèêëíìîïñóòôöõúùûü†°¢£§•¶ß®Š™´¨≠ŽØ∞±≤≥∆µ∂∑∏š∫ªºΩžø¿¡¬√ƒ≈Ć«Č… ÀÃÕŒœĐ—“”‘’÷◊�©⁄¤‹›Æ»–·‚„‰ÂćÁčÈÍÎÏÌÓÔđÒÚÛÙıˆ˜¯πË˚¸Êæˇ"
  },
  "maccyrillic": {
    "type": "_sbcs",
    "chars": "АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ†°¢£§•¶І®©™Ђђ≠Ѓѓ∞±≤≥іµ∂ЈЄєЇїЉљЊњјЅ¬√ƒ≈∆«»… ЋћЌќѕ–—“”‘’÷„ЎўЏџ№Ёёяабвгдежзийклмнопрстуфхцчшщъыьэю¤"
  },
  "macgreek": {
    "type": "_sbcs",
    "chars": "Ĺ²É³ÖÜ΅àâä΄¨çéèê룙î‰ôö¦­ùûü†ΓΔΘΛΞΠß®©ΣΪ§≠°·Α±≤≥¥ΒΕΖΗΙΚΜΦΫΨΩάΝ¬ΟΡ≈Τ«»… ΥΧΆΈœ–―“”‘’÷ΉΊΌΎέήίόΏύαβψδεφγηιξκλμνοπώρστθωςχυζϊϋΐΰ�"
  },
  "maciceland": {
    "type": "_sbcs",
    "chars": "ÄÅÇÉÑÖÜáàâäãåçéèêëíìîïñóòôöõúùûüÝ°¢£§•¶ß®©™´¨≠ÆØ∞±≤≥¥µ∂∑∏π∫ªºΩæø¿¡¬√ƒ≈∆«»… ÀÃÕŒœ–—“”‘’÷◊ÿŸ⁄¤ÐðÞþý·‚„‰ÂÊÁËÈÍÎÏÌÓÔ�ÒÚÛÙıˆ˜¯˘˙˚¸˝˛ˇ"
  },
  "macroman": {
    "type": "_sbcs",
    "chars": "ÄÅÇÉÑÖÜáàâäãåçéèêëíìîïñóòôöõúùûü†°¢£§•¶ß®©™´¨≠ÆØ∞±≤≥¥µ∂∑∏π∫ªºΩæø¿¡¬√ƒ≈∆«»… ÀÃÕŒœ–—“”‘’÷◊ÿŸ⁄¤‹›fifl‡·‚„‰ÂÊÁËÈÍÎÏÌÓÔ�ÒÚÛÙıˆ˜¯˘˙˚¸˝˛ˇ"
  },
  "macromania": {
    "type": "_sbcs",
    "chars": "ÄÅÇÉÑÖÜáàâäãåçéèêëíìîïñóòôöõúùûü†°¢£§•¶ß®©™´¨≠ĂŞ∞±≤≥¥µ∂∑∏π∫ªºΩăş¿¡¬√ƒ≈∆«»… ÀÃÕŒœ–—“”‘’÷◊ÿŸ⁄¤‹›Ţţ‡·‚„‰ÂÊÁËÈÍÎÏÌÓÔ�ÒÚÛÙıˆ˜¯˘˙˚¸˝˛ˇ"
  },
  "macthai": {
    "type": "_sbcs",
    "chars": "«»…“”�•‘’� กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู​–—฿เแโใไๅๆ็่้๊๋์ํ™๏๐๑๒๓๔๕๖๗๘๙®©����"
  },
  "macturkish": {
    "type": "_sbcs",
    "chars": "ÄÅÇÉÑÖÜáàâäãåçéèêëíìîïñóòôöõúùûü†°¢£§•¶ß®©™´¨≠ÆØ∞±≤≥¥µ∂∑∏π∫ªºΩæø¿¡¬√ƒ≈∆«»… ÀÃÕŒœ–—“”‘’÷◊ÿŸĞğİıŞş‡·‚„‰ÂÊÁËÈÍÎÏÌÓÔ�ÒÚÛÙ�ˆ˜¯˘˙˚¸˝˛ˇ"
  },
  "macukraine": {
    "type": "_sbcs",
    "chars": "АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ†°Ґ£§•¶І®©™Ђђ≠Ѓѓ∞±≤≥іµґЈЄєЇїЉљЊњјЅ¬√ƒ≈∆«»… ЋћЌќѕ–—“”‘’÷„ЎўЏџ№Ёёяабвгдежзийклмнопрстуфхцчшщъыьэю¤"
  },
  "koi8r": {
    "type": "_sbcs",
    "chars": "─│┌┐└┘├┤┬┴┼▀▄█▌▐░▒▓⌠■∙√≈≤≥ ⌡°²·÷═║╒ё╓╔╕╖╗╘╙╚╛╜╝╞╟╠╡Ё╢╣╤╥╦╧╨╩╪╫╬©юабцдефгхийклмнопярстужвьызшэщчъЮАБЦДЕФГХИЙКЛМНОПЯРСТУЖВЬЫЗШЭЩЧЪ"
  },
  "koi8u": {
    "type": "_sbcs",
    "chars": "─│┌┐└┘├┤┬┴┼▀▄█▌▐░▒▓⌠■∙√≈≤≥ ⌡°²·÷═║╒ёє╔ії╗╘╙╚╛ґ╝╞╟╠╡ЁЄ╣ІЇ╦╧╨╩╪Ґ╬©юабцдефгхийклмнопярстужвьызшэщчъЮАБЦДЕФГХИЙКЛМНОПЯРСТУЖВЬЫЗШЭЩЧЪ"
  },
  "koi8ru": {
    "type": "_sbcs",
    "chars": "─│┌┐└┘├┤┬┴┼▀▄█▌▐░▒▓⌠■∙√≈≤≥ ⌡°²·÷═║╒ёє╔ії╗╘╙╚╛ґў╞╟╠╡ЁЄ╣ІЇ╦╧╨╩╪ҐЎ©юабцдефгхийклмнопярстужвьызшэщчъЮАБЦДЕФГХИЙКЛМНОПЯРСТУЖВЬЫЗШЭЩЧЪ"
  },
  "koi8t": {
    "type": "_sbcs",
    "chars": "қғ‚Ғ„…†‡�‰ҳ‹ҲҷҶ�Қ‘’“”•–—�™�›�����ӯӮё¤ӣ¦§���«¬­®�°±²Ё�Ӣ¶·�№�»���©юабцдефгхийклмнопярстужвьызшэщчъЮАБЦДЕФГХИЙКЛМНОПЯРСТУЖВЬЫЗШЭЩЧЪ"
  },
  "armscii8": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ �և։)(»«—.՝,-֊…՜՛՞ԱաԲբԳգԴդԵեԶզԷէԸըԹթԺժԻիԼլԽխԾծԿկՀհՁձՂղՃճՄմՅյՆնՇշՈոՉչՊպՋջՌռՍսՎվՏտՐրՑցՒւՓփՔքՕօՖֆ՚�"
  },
  "rk1048": {
    "type": "_sbcs",
    "chars": "ЂЃ‚ѓ„…†‡€‰Љ‹ЊҚҺЏђ‘’“”•–—�™љ›њқһџ ҰұӘ¤Ө¦§Ё©Ғ«¬­®Ү°±Ііөµ¶·ё№ғ»әҢңүАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя"
  },
  "tcvn": {
    "type": "_sbcs",
    "chars": "\u0000ÚỤ\u0003ỪỬỮ\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010ỨỰỲỶỸÝỴ\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~ÀẢÃÁẠẶẬÈẺẼÉẸỆÌỈĨÍỊÒỎÕÓỌỘỜỞỠỚỢÙỦŨ ĂÂÊÔƠƯĐăâêôơưđẶ̀̀̉̃́àảãáạẲằẳẵắẴẮẦẨẪẤỀặầẩẫấậèỂẻẽéẹềểễếệìỉỄẾỒĩíịòỔỏõóọồổỗốộờởỡớợùỖủũúụừửữứựỳỷỹýỵỐ"
  },
  "georgianacademy": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿აბგდევზთიკლმნოპჟრსტუფქღყშჩცძწჭხჯჰჱჲჳჴჵჶçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
  },
  "georgianps": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿აბგდევზჱთიკლმნჲოპჟრსტჳუფქღყშჩცძწჭხჴჯჰჵæçèéêëìíîïðñòóôõö÷øùúûüýþÿ"
  },
  "pt154": {
    "type": "_sbcs",
    "chars": "ҖҒӮғ„…ҶҮҲүҠӢҢҚҺҸҗ‘’“”•–—ҳҷҡӣңқһҹ ЎўЈӨҘҰ§Ё©Ә«¬ӯ®Ҝ°ұІіҙө¶·ё№ә»јҪҫҝАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя"
  },
  "viscii": {
    "type": "_sbcs",
    "chars": "\u0000\u0001Ẳ\u0003\u0004ẴẪ\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013Ỷ\u0015\u0016\u0017\u0018Ỹ\u001a\u001b\u001c\u001dỴ\u001f !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~ẠẮẰẶẤẦẨẬẼẸẾỀỂỄỆỐỒỔỖỘỢỚỜỞỊỎỌỈỦŨỤỲÕắằặấầẩậẽẹếềểễệốồổỗỠƠộờởịỰỨỪỬơớƯÀÁÂÃẢĂẳẵÈÉÊẺÌÍĨỳĐứÒÓÔạỷừửÙÚỹỵÝỡưàáâãảăữẫèéêẻìíĩỉđựòóôõỏọụùúũủýợỮ"
  },
  "iso646cn": {
    "type": "_sbcs",
    "chars": "\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f !\"#¥%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}‾��������������������������������������������������������������������������������������������������������������������������������"
  },
  "iso646jp": {
    "type": "_sbcs",
    "chars": "\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[¥]^_`abcdefghijklmnopqrstuvwxyz{|}‾��������������������������������������������������������������������������������������������������������������������������������"
  },
  "hproman8": {
    "type": "_sbcs",
    "chars": "€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ÀÂÈÊËÎÏ´ˋˆ¨˜ÙÛ₤¯Ýý°ÇçÑñ¡¿¤£¥§ƒ¢âêôûáéóúàèòùäëöüÅîØÆåíøæÄìÖÜÉïßÔÁÃãÐðÍÌÓÒÕõŠšÚŸÿÞþ·µ¶¾—¼½ªº«■»±�"
  },
  "macintosh": {
    "type": "_sbcs",
    "chars": "ÄÅÇÉÑÖÜáàâäãåçéèêëíìîïñóòôöõúùûü†°¢£§•¶ß®©™´¨≠ÆØ∞±≤≥¥µ∂∑∏π∫ªºΩæø¿¡¬√ƒ≈∆«»… ÀÃÕŒœ–—“”‘’÷◊ÿŸ⁄¤‹›fifl‡·‚„‰ÂÊÁËÈÍÎÏÌÓÔ�ÒÚÛÙıˆ˜¯˘˙˚¸˝˛ˇ"
  },
  "ascii": {
    "type": "_sbcs",
    "chars": "��������������������������������������������������������������������������������������������������������������������������������"
  },
  "tis620": {
    "type": "_sbcs",
    "chars": "���������������������������������กขฃคฅฆงจฉชซฌญฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู����฿เแโใไๅๆ็่้๊๋์ํ๎๏๐๑๒๓๔๕๖๗๘๙๚๛����"
  }
}
},{}],16:[function(require,module,exports){
"use strict"

// Manually added data to be used by sbcs codec in addition to generated one.

module.exports = {
    // Not supported by iconv, not sure why.
    "10029": "maccenteuro",
    "maccenteuro": {
        "type": "_sbcs",
        "chars": "ÄĀāÉĄÖÜáąČäčĆć鏟ĎíďĒēĖóėôöõúĚěü†°Ę£§•¶ß®©™ę¨≠ģĮįĪ≤≥īĶ∂∑łĻļĽľĹĺŅņѬ√ńŇ∆«»… ňŐÕőŌ–—“”‘’÷◊ōŔŕŘ‹›řŖŗŠ‚„šŚśÁŤťÍŽžŪÓÔūŮÚůŰűŲųÝýķŻŁżĢˇ"
    },

    "808": "cp808",
    "ibm808": "cp808",
    "cp808": {
        "type": "_sbcs",
        "chars": "АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмноп░▒▓│┤╡╢╖╕╣║╗╝╜╛┐└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀рстуфхцчшщъыьэюяЁёЄєЇїЎў°∙·√№€■ "
    },

    // Aliases of generated encodings.
    "ascii8bit": "ascii",
    "usascii": "ascii",
    "ansix34": "ascii",
    "ansix341968": "ascii",
    "ansix341986": "ascii",
    "csascii": "ascii",
    "cp367": "ascii",
    "ibm367": "ascii",
    "isoir6": "ascii",
    "iso646us": "ascii",
    "iso646irv": "ascii",
    "us": "ascii",

    "latin1": "iso88591",
    "latin2": "iso88592",
    "latin3": "iso88593",
    "latin4": "iso88594",
    "latin5": "iso88599",
    "latin6": "iso885910",
    "latin7": "iso885913",
    "latin8": "iso885914",
    "latin9": "iso885915",
    "latin10": "iso885916",

    "csisolatin1": "iso88591",
    "csisolatin2": "iso88592",
    "csisolatin3": "iso88593",
    "csisolatin4": "iso88594",
    "csisolatincyrillic": "iso88595",
    "csisolatinarabic": "iso88596",
    "csisolatingreek" : "iso88597",
    "csisolatinhebrew": "iso88598",
    "csisolatin5": "iso88599",
    "csisolatin6": "iso885910",

    "l1": "iso88591",
    "l2": "iso88592",
    "l3": "iso88593",
    "l4": "iso88594",
    "l5": "iso88599",
    "l6": "iso885910",
    "l7": "iso885913",
    "l8": "iso885914",
    "l9": "iso885915",
    "l10": "iso885916",

    "isoir14": "iso646jp",
    "isoir57": "iso646cn",
    "isoir100": "iso88591",
    "isoir101": "iso88592",
    "isoir109": "iso88593",
    "isoir110": "iso88594",
    "isoir144": "iso88595",
    "isoir127": "iso88596",
    "isoir126": "iso88597",
    "isoir138": "iso88598",
    "isoir148": "iso88599",
    "isoir157": "iso885910",
    "isoir166": "tis620",
    "isoir179": "iso885913",
    "isoir199": "iso885914",
    "isoir203": "iso885915",
    "isoir226": "iso885916",

    "cp819": "iso88591",
    "ibm819": "iso88591",

    "cyrillic": "iso88595",

    "arabic": "iso88596",
    "arabic8": "iso88596",
    "ecma114": "iso88596",
    "asmo708": "iso88596",

    "greek" : "iso88597",
    "greek8" : "iso88597",
    "ecma118" : "iso88597",
    "elot928" : "iso88597",

    "hebrew": "iso88598",
    "hebrew8": "iso88598",

    "turkish": "iso88599",
    "turkish8": "iso88599",

    "thai": "iso885911",
    "thai8": "iso885911",

    "celtic": "iso885914",
    "celtic8": "iso885914",
    "isoceltic": "iso885914",

    "tis6200": "tis620",
    "tis62025291": "tis620",
    "tis62025330": "tis620",

    "10000": "macroman",
    "10006": "macgreek",
    "10007": "maccyrillic",
    "10079": "maciceland",
    "10081": "macturkish",

    "cspc8codepage437": "cp437",
    "cspc775baltic": "cp775",
    "cspc850multilingual": "cp850",
    "cspcp852": "cp852",
    "cspc862latinhebrew": "cp862",
    "cpgr": "cp869",

    "msee": "cp1250",
    "mscyrl": "cp1251",
    "msansi": "cp1252",
    "msgreek": "cp1253",
    "msturk": "cp1254",
    "mshebr": "cp1255",
    "msarab": "cp1256",
    "winbaltrim": "cp1257",

    "cp20866": "koi8r",
    "20866": "koi8r",
    "ibm878": "koi8r",
    "cskoi8r": "koi8r",

    "cp21866": "koi8u",
    "21866": "koi8u",
    "ibm1168": "koi8u",

    "strk10482002": "rk1048",

    "tcvn5712": "tcvn",
    "tcvn57121": "tcvn",

    "gb198880": "iso646cn",
    "cn": "iso646cn",

    "csiso14jisc6220ro": "iso646jp",
    "jisc62201969ro": "iso646jp",
    "jp": "iso646jp",

    "cshproman8": "hproman8",
    "r8": "hproman8",
    "roman8": "hproman8",
    "xroman8": "hproman8",
    "ibm1051": "hproman8",

    "mac": "macintosh",
    "csmacintosh": "macintosh",
};


},{}],17:[function(require,module,exports){
module.exports=[
["8740","䏰䰲䘃䖦䕸𧉧䵷䖳𧲱䳢𧳅㮕䜶䝄䱇䱀𤊿𣘗𧍒𦺋𧃒䱗𪍑䝏䗚䲅𧱬䴇䪤䚡𦬣爥𥩔𡩣𣸆𣽡晍囻"],
["8767","綕夝𨮹㷴霴𧯯寛𡵞媤㘥𩺰嫑宷峼杮薓𩥅瑡璝㡵𡵓𣚞𦀡㻬"],
["87a1","𥣞㫵竼龗𤅡𨤍𣇪𠪊𣉞䌊蒄龖鐯䤰蘓墖靊鈘秐稲晠権袝瑌篅枂稬剏遆㓦珄𥶹瓆鿇垳䤯呌䄱𣚎堘穲𧭥讏䚮𦺈䆁𥶙箮𢒼鿈𢓁𢓉𢓌鿉蔄𣖻䂴鿊䓡𪷿拁灮鿋"],
["8840","㇀",4,"𠄌㇅𠃑𠃍㇆㇇𠃋𡿨㇈𠃊㇉㇊㇋㇌𠄎㇍㇎ĀÁǍÀĒÉĚÈŌÓǑÒ࿿Ê̄Ế࿿Ê̌ỀÊāáǎàɑēéěèīíǐìōóǒòūúǔùǖǘǚ"],
["88a1","ǜü࿿ê̄ế࿿ê̌ềêɡ⏚⏛"],
["8940","𪎩𡅅"],
["8943","攊"],
["8946","丽滝鵎釟"],
["894c","𧜵撑会伨侨兖兴农凤务动医华发变团声处备夲头学实実岚庆总斉柾栄桥济炼电纤纬纺织经统缆缷艺苏药视设询车轧轮"],
["89a1","琑糼緍楆竉刧"],
["89ab","醌碸酞肼"],
["89b0","贋胶𠧧"],
["89b5","肟黇䳍鷉鸌䰾𩷶𧀎鸊𪄳㗁"],
["89c1","溚舾甙"],
["89c5","䤑马骏龙禇𨑬𡷊𠗐𢫦两亁亀亇亿仫伷㑌侽㹈倃傈㑽㒓㒥円夅凛凼刅争剹劐匧㗇厩㕑厰㕓参吣㕭㕲㚁咓咣咴咹哐哯唘唣唨㖘唿㖥㖿嗗㗅"],
["8a40","𧶄唥"],
["8a43","𠱂𠴕𥄫喐𢳆㧬𠍁蹆𤶸𩓥䁓𨂾睺𢰸㨴䟕𨅝𦧲𤷪擝𠵼𠾴𠳕𡃴撍蹾𠺖𠰋𠽤𢲩𨉖𤓓"],
["8a64","𠵆𩩍𨃩䟴𤺧𢳂骲㩧𩗴㿭㔆𥋇𩟔𧣈𢵄鵮頕"],
["8a76","䏙𦂥撴哣𢵌𢯊𡁷㧻𡁯"],
["8aa1","𦛚𦜖𧦠擪𥁒𠱃蹨𢆡𨭌𠜱"],
["8aac","䠋𠆩㿺塳𢶍"],
["8ab2","𤗈𠓼𦂗𠽌𠶖啹䂻䎺"],
["8abb","䪴𢩦𡂝膪飵𠶜捹㧾𢝵跀嚡摼㹃"],
["8ac9","𪘁𠸉𢫏𢳉"],
["8ace","𡃈𣧂㦒㨆𨊛㕸𥹉𢃇噒𠼱𢲲𩜠㒼氽𤸻"],
["8adf","𧕴𢺋𢈈𪙛𨳍𠹺𠰴𦠜羓𡃏𢠃𢤹㗻𥇣𠺌𠾍𠺪㾓𠼰𠵇𡅏𠹌"],
["8af6","𠺫𠮩𠵈𡃀𡄽㿹𢚖搲𠾭"],
["8b40","𣏴𧘹𢯎𠵾𠵿𢱑𢱕㨘𠺘𡃇𠼮𪘲𦭐𨳒𨶙𨳊閪哌苄喹"],
["8b55","𩻃鰦骶𧝞𢷮煀腭胬尜𦕲脴㞗卟𨂽醶𠻺𠸏𠹷𠻻㗝𤷫㘉𠳖嚯𢞵𡃉𠸐𠹸𡁸𡅈𨈇𡑕𠹹𤹐𢶤婔𡀝𡀞𡃵𡃶垜𠸑"],
["8ba1","𧚔𨋍𠾵𠹻𥅾㜃𠾶𡆀𥋘𪊽𤧚𡠺𤅷𨉼墙剨㘚𥜽箲孨䠀䬬鼧䧧鰟鮍𥭴𣄽嗻㗲嚉丨夂𡯁屮靑𠂆乛亻㔾尣彑忄㣺扌攵歺氵氺灬爫丬犭𤣩罒礻糹罓𦉪㓁"],
["8bde","𦍋耂肀𦘒𦥑卝衤见𧢲讠贝钅镸长门𨸏韦页风飞饣𩠐鱼鸟黄歯龜丷𠂇阝户钢"],
["8c40","倻淾𩱳龦㷉袏𤅎灷峵䬠𥇍㕙𥴰愢𨨲辧釶熑朙玺𣊁𪄇㲋𡦀䬐磤琂冮𨜏䀉橣𪊺䈣蘏𠩯稪𩥇𨫪靕灍匤𢁾鏴盙𨧣龧矝亣俰傼丯众龨吴綋墒壐𡶶庒庙忂𢜒斋"],
["8ca1","𣏹椙橃𣱣泿"],
["8ca7","爀𤔅玌㻛𤨓嬕璹讃𥲤𥚕窓篬糃繬苸薗龩袐龪躹龫迏蕟駠鈡龬𨶹𡐿䁱䊢娚"],
["8cc9","顨杫䉶圽"],
["8cce","藖𤥻芿𧄍䲁𦵴嵻𦬕𦾾龭龮宖龯曧繛湗秊㶈䓃𣉖𢞖䎚䔶"],
["8ce6","峕𣬚諹屸㴒𣕑嵸龲煗䕘𤃬𡸣䱷㥸㑊𠆤𦱁諌侴𠈹妿腬顖𩣺弻"],
["8d40","𠮟"],
["8d42","𢇁𨥭䄂䚻𩁹㼇龳𪆵䃸㟖䛷𦱆䅼𨚲𧏿䕭㣔𥒚䕡䔛䶉䱻䵶䗪㿈𤬏㙡䓞䒽䇭崾嵈嵖㷼㠏嶤嶹㠠㠸幂庽弥徃㤈㤔㤿㥍惗愽峥㦉憷憹懏㦸戬抐拥挘㧸嚱"],
["8da1","㨃揢揻搇摚㩋擀崕嘡龟㪗斆㪽旿晓㫲暒㬢朖㭂枤栀㭘桊梄㭲㭱㭻椉楃牜楤榟榅㮼槖㯝橥橴橱檂㯬檙㯲檫檵櫔櫶殁毁毪汵沪㳋洂洆洦涁㳯涤涱渕渘温溆𨧀溻滢滚齿滨滩漤漴㵆𣽁澁澾㵪㵵熷岙㶊瀬㶑灐灔灯灿炉𠌥䏁㗱𠻘"],
["8e40","𣻗垾𦻓焾𥟠㙎榢𨯩孴穉𥣡𩓙穥穽𥦬窻窰竂竃燑𦒍䇊竚竝竪䇯咲𥰁笋筕笩𥌎𥳾箢筯莜𥮴𦱿篐萡箒箸𥴠㶭𥱥蒒篺簆簵𥳁籄粃𤢂粦晽𤕸糉糇糦籴糳糵糎"],
["8ea1","繧䔝𦹄絝𦻖璍綉綫焵綳緒𤁗𦀩緤㴓緵𡟹緥𨍭縝𦄡𦅚繮纒䌫鑬縧罀罁罇礶𦋐駡羗𦍑羣𡙡𠁨䕜𣝦䔃𨌺翺𦒉者耈耝耨耯𪂇𦳃耻耼聡𢜔䦉𦘦𣷣𦛨朥肧𨩈脇脚墰𢛶汿𦒘𤾸擧𡒊舘𡡞橓𤩥𤪕䑺舩𠬍𦩒𣵾俹𡓽蓢荢𦬊𤦧𣔰𡝳𣷸芪椛芳䇛"],
["8f40","蕋苐茚𠸖𡞴㛁𣅽𣕚艻苢茘𣺋𦶣𦬅𦮗𣗎㶿茝嗬莅䔋𦶥莬菁菓㑾𦻔橗蕚㒖𦹂𢻯葘𥯤葱㷓䓤檧葊𣲵祘蒨𦮖𦹷𦹃蓞萏莑䒠蒓蓤𥲑䉀𥳀䕃蔴嫲𦺙䔧蕳䔖枿蘖"],
["8fa1","𨘥𨘻藁𧂈蘂𡖂𧃍䕫䕪蘨㙈𡢢号𧎚虾蝱𪃸蟮𢰧螱蟚蠏噡虬桖䘏衅衆𧗠𣶹𧗤衞袜䙛袴袵揁装睷𧜏覇覊覦覩覧覼𨨥觧𧤤𧪽誜瞓釾誐𧩙竩𧬺𣾏䜓𧬸煼謌謟𥐰𥕥謿譌譍誩𤩺讐讛誯𡛟䘕衏貛𧵔𧶏貫㜥𧵓賖𧶘𧶽贒贃𡤐賛灜贑𤳉㻐起"],
["9040","趩𨀂𡀔𤦊㭼𨆼𧄌竧躭躶軃鋔輙輭𨍥𨐒辥錃𪊟𠩐辳䤪𨧞𨔽𣶻廸𣉢迹𪀔𨚼𨔁𢌥㦀𦻗逷𨔼𧪾遡𨕬𨘋邨𨜓郄𨛦邮都酧㫰醩釄粬𨤳𡺉鈎沟鉁鉢𥖹銹𨫆𣲛𨬌𥗛"],
["90a1","𠴱錬鍫𨫡𨯫炏嫃𨫢𨫥䥥鉄𨯬𨰹𨯿鍳鑛躼閅閦鐦閠濶䊹𢙺𨛘𡉼𣸮䧟氜陻隖䅬隣𦻕懚隶磵𨫠隽双䦡𦲸𠉴𦐐𩂯𩃥𤫑𡤕𣌊霱虂霶䨏䔽䖅𤫩灵孁霛靜𩇕靗孊𩇫靟鐥僐𣂷𣂼鞉鞟鞱鞾韀韒韠𥑬韮琜𩐳響韵𩐝𧥺䫑頴頳顋顦㬎𧅵㵑𠘰𤅜"],
["9140","𥜆飊颷飈飇䫿𦴧𡛓喰飡飦飬鍸餹𤨩䭲𩡗𩤅駵騌騻騐驘𥜥㛄𩂱𩯕髠髢𩬅髴䰎鬔鬭𨘀倴鬴𦦨㣃𣁽魐魀𩴾婅𡡣鮎𤉋鰂鯿鰌𩹨鷔𩾷𪆒𪆫𪃡𪄣𪇟鵾鶃𪄴鸎梈"],
["91a1","鷄𢅛𪆓𪈠𡤻𪈳鴹𪂹𪊴麐麕麞麢䴴麪麯𤍤黁㭠㧥㴝伲㞾𨰫鼂鼈䮖鐤𦶢鼗鼖鼹嚟嚊齅馸𩂋韲葿齢齩竜龎爖䮾𤥵𤦻煷𤧸𤍈𤩑玞𨯚𡣺禟𨥾𨸶鍩鏳𨩄鋬鎁鏋𨥬𤒹爗㻫睲穃烐𤑳𤏸煾𡟯炣𡢾𣖙㻇𡢅𥐯𡟸㜢𡛻𡠹㛡𡝴𡣑𥽋㜣𡛀坛𤨥𡏾𡊨"],
["9240","𡏆𡒶蔃𣚦蔃葕𤦔𧅥𣸱𥕜𣻻𧁒䓴𣛮𩦝𦼦柹㜳㰕㷧塬𡤢栐䁗𣜿𤃡𤂋𤄏𦰡哋嚞𦚱嚒𠿟𠮨𠸍鏆𨬓鎜仸儫㠙𤐶亼𠑥𠍿佋侊𥙑婨𠆫𠏋㦙𠌊𠐔㐵伩𠋀𨺳𠉵諚𠈌亘"],
["92a1","働儍侢伃𤨎𣺊佂倮偬傁俌俥偘僼兙兛兝兞湶𣖕𣸹𣺿浲𡢄𣺉冨凃𠗠䓝𠒣𠒒𠒑赺𨪜𠜎剙劤𠡳勡鍮䙺熌𤎌𠰠𤦬𡃤槑𠸝瑹㻞璙琔瑖玘䮎𤪼𤂍叐㖄爏𤃉喴𠍅响𠯆圝鉝雴鍦埝垍坿㘾壋媙𨩆𡛺𡝯𡜐娬妸銏婾嫏娒𥥆𡧳𡡡𤊕㛵洅瑃娡𥺃"],
["9340","媁𨯗𠐓鏠璌𡌃焅䥲鐈𨧻鎽㞠尞岞幞幈𡦖𡥼𣫮廍孏𡤃𡤄㜁𡢠㛝𡛾㛓脪𨩇𡶺𣑲𨦨弌弎𡤧𡞫婫𡜻孄蘔𧗽衠恾𢡠𢘫忛㺸𢖯𢖾𩂈𦽳懀𠀾𠁆𢘛憙憘恵𢲛𢴇𤛔𩅍"],
["93a1","摱𤙥𢭪㨩𢬢𣑐𩣪𢹸挷𪑛撶挱揑𤧣𢵧护𢲡搻敫楲㯴𣂎𣊭𤦉𣊫唍𣋠𡣙𩐿曎𣊉𣆳㫠䆐𥖄𨬢𥖏𡛼𥕛𥐥磮𣄃𡠪𣈴㑤𣈏𣆂𤋉暎𦴤晫䮓昰𧡰𡷫晣𣋒𣋡昞𥡲㣑𣠺𣞼㮙𣞢𣏾瓐㮖枏𤘪梶栞㯄檾㡣𣟕𤒇樳橒櫉欅𡤒攑梘橌㯗橺歗𣿀𣲚鎠鋲𨯪𨫋"],
["9440","銉𨀞𨧜鑧涥漋𤧬浧𣽿㶏渄𤀼娽渊塇洤硂焻𤌚𤉶烱牐犇犔𤞏𤜥兹𤪤𠗫瑺𣻸𣙟𤩊𤤗𥿡㼆㺱𤫟𨰣𣼵悧㻳瓌琼鎇琷䒟𦷪䕑疃㽣𤳙𤴆㽘畕癳𪗆㬙瑨𨫌𤦫𤦎㫻"],
["94a1","㷍𤩎㻿𤧅𤣳釺圲鍂𨫣𡡤僟𥈡𥇧睸𣈲眎眏睻𤚗𣞁㩞𤣰琸璛㺿𤪺𤫇䃈𤪖𦆮錇𥖁砞碍碈磒珐祙𧝁𥛣䄎禛蒖禥樭𣻺稺秴䅮𡛦䄲鈵秱𠵌𤦌𠊙𣶺𡝮㖗啫㕰㚪𠇔𠰍竢婙𢛵𥪯𥪜娍𠉛磰娪𥯆竾䇹籝籭䈑𥮳𥺼𥺦糍𤧹𡞰粎籼粮檲緜縇緓罎𦉡"],
["9540","𦅜𧭈綗𥺂䉪𦭵𠤖柖𠁎𣗏埄𦐒𦏸𤥢翝笧𠠬𥫩𥵃笌𥸎駦虅驣樜𣐿㧢𤧷𦖭騟𦖠蒀𧄧𦳑䓪脷䐂胆脉腂𦞴飃𦩂艢艥𦩑葓𦶧蘐𧈛媆䅿𡡀嬫𡢡嫤𡣘蚠蜨𣶏蠭𧐢娂"],
["95a1","衮佅袇袿裦襥襍𥚃襔𧞅𧞄𨯵𨯙𨮜𨧹㺭蒣䛵䛏㟲訽訜𩑈彍鈫𤊄旔焩烄𡡅鵭貟賩𧷜妚矃姰䍮㛔踪躧𤰉輰轊䋴汘澻𢌡䢛潹溋𡟚鯩㚵𤤯邻邗啱䤆醻鐄𨩋䁢𨫼鐧𨰝𨰻蓥訫閙閧閗閖𨴴瑅㻂𤣿𤩂𤏪㻧𣈥随𨻧𨹦𨹥㻌𤧭𤩸𣿮琒瑫㻼靁𩂰"],
["9640","桇䨝𩂓𥟟靝鍨𨦉𨰦𨬯𦎾銺嬑譩䤼珹𤈛鞛靱餸𠼦巁𨯅𤪲頟𩓚鋶𩗗釥䓀𨭐𤩧𨭤飜𨩅㼀鈪䤥萔餻饍𧬆㷽馛䭯馪驜𨭥𥣈檏騡嫾騯𩣱䮐𩥈馼䮽䮗鍽塲𡌂堢𤦸"],
["96a1","𡓨硄𢜟𣶸棅㵽鑘㤧慐𢞁𢥫愇鱏鱓鱻鰵鰐魿鯏𩸭鮟𪇵𪃾鴡䲮𤄄鸘䲰鴌𪆴𪃭𪃳𩤯鶥蒽𦸒𦿟𦮂藼䔳𦶤𦺄𦷰萠藮𦸀𣟗𦁤秢𣖜𣙀䤭𤧞㵢鏛銾鍈𠊿碹鉷鑍俤㑀遤𥕝砽硔碶硋𡝗𣇉𤥁㚚佲濚濙瀞瀞吔𤆵垻壳垊鴖埗焴㒯𤆬燫𦱀𤾗嬨𡞵𨩉"],
["9740","愌嫎娋䊼𤒈㜬䭻𨧼鎻鎸𡣖𠼝葲𦳀𡐓𤋺𢰦𤏁妔𣶷𦝁綨𦅛𦂤𤦹𤦋𨧺鋥珢㻩璴𨭣𡢟㻡𤪳櫘珳珻㻖𤨾𤪔𡟙𤩦𠎧𡐤𤧥瑈𤤖炥𤥶銄珦鍟𠓾錱𨫎𨨖鎆𨯧𥗕䤵𨪂煫"],
["97a1","𤥃𠳿嚤𠘚𠯫𠲸唂秄𡟺緾𡛂𤩐𡡒䔮鐁㜊𨫀𤦭妰𡢿𡢃𧒄媡㛢𣵛㚰鉟婹𨪁𡡢鍴㳍𠪴䪖㦊僴㵩㵌𡎜煵䋻𨈘渏𩃤䓫浗𧹏灧沯㳖𣿭𣸭渂漌㵯𠏵畑㚼㓈䚀㻚䡱姄鉮䤾轁𨰜𦯀堒埈㛖𡑒烾𤍢𤩱𢿣𡊰𢎽梹楧𡎘𣓥𧯴𣛟𨪃𣟖𣏺𤲟樚𣚭𦲷萾䓟䓎"],
["9840","𦴦𦵑𦲂𦿞漗𧄉茽𡜺菭𦲀𧁓𡟛妉媂𡞳婡婱𡤅𤇼㜭姯𡜼㛇熎鎐暚𤊥婮娫𤊓樫𣻹𧜶𤑛𤋊焝𤉙𨧡侰𦴨峂𤓎𧹍𤎽樌𤉖𡌄炦焳𤏩㶥泟勇𤩏繥姫崯㷳彜𤩝𡟟綤萦"],
["98a1","咅𣫺𣌀𠈔坾𠣕𠘙㿥𡾞𪊶瀃𩅛嵰玏糓𨩙𩐠俈翧狍猐𧫴猸猹𥛶獁獈㺩𧬘遬燵𤣲珡臶㻊県㻑沢国琙琞琟㻢㻰㻴㻺瓓㼎㽓畂畭畲疍㽼痈痜㿀癍㿗癴㿜発𤽜熈嘣覀塩䀝睃䀹条䁅㗛瞘䁪䁯属瞾矋売砘点砜䂨砹硇硑硦葈𥔵礳栃礲䄃"],
["9940","䄉禑禙辻稆込䅧窑䆲窼艹䇄竏竛䇏両筢筬筻簒簛䉠䉺类粜䊌粸䊔糭输烀𠳏総緔緐緽羮羴犟䎗耠耥笹耮耱联㷌垴炠肷胩䏭脌猪脎脒畠脔䐁㬹腖腙腚"],
["99a1","䐓堺腼膄䐥膓䐭膥埯臁臤艔䒏芦艶苊苘苿䒰荗险榊萅烵葤惣蒈䔄蒾蓡蓸蔐蔸蕒䔻蕯蕰藠䕷虲蚒蚲蛯际螋䘆䘗袮裿褤襇覑𧥧訩訸誔誴豑賔賲贜䞘塟跃䟭仮踺嗘坔蹱嗵躰䠷軎転軤軭軲辷迁迊迌逳駄䢭飠鈓䤞鈨鉘鉫銱銮銿"],
["9a40","鋣鋫鋳鋴鋽鍃鎄鎭䥅䥑麿鐗匁鐝鐭鐾䥪鑔鑹锭関䦧间阳䧥枠䨤靀䨵鞲韂噔䫤惨颹䬙飱塄餎餙冴餜餷饂饝饢䭰駅䮝騼鬏窃魩鮁鯝鯱鯴䱭鰠㝯𡯂鵉鰺"],
["9aa1","黾噐鶓鶽鷀鷼银辶鹻麬麱麽黆铜黢黱黸竈齄𠂔𠊷𠎠椚铃妬𠓗塀铁㞹𠗕𠘕𠙶𡚺块煳𠫂𠫍𠮿呪吆𠯋咞𠯻𠰻𠱓𠱥𠱼惧𠲍噺𠲵𠳝𠳭𠵯𠶲𠷈楕鰯螥𠸄𠸎𠻗𠾐𠼭𠹳尠𠾼帋𡁜𡁏𡁶朞𡁻𡂈𡂖㙇𡂿𡃓𡄯𡄻卤蒭𡋣𡍵𡌶讁𡕷𡘙𡟃𡟇乸炻𡠭𡥪"],
["9b40","𡨭𡩅𡰪𡱰𡲬𡻈拃𡻕𡼕熘桕𢁅槩㛈𢉼𢏗𢏺𢜪𢡱𢥏苽𢥧𢦓𢫕覥𢫨辠𢬎鞸𢬿顇骽𢱌"],
["9b62","𢲈𢲷𥯨𢴈𢴒𢶷𢶕𢹂𢽴𢿌𣀳𣁦𣌟𣏞徱晈暿𧩹𣕧𣗳爁𤦺矗𣘚𣜖纇𠍆墵朎"],
["9ba1","椘𣪧𧙗𥿢𣸑𣺹𧗾𢂚䣐䪸𤄙𨪚𤋮𤌍𤀻𤌴𤎖𤩅𠗊凒𠘑妟𡺨㮾𣳿𤐄𤓖垈𤙴㦛𤜯𨗨𩧉㝢𢇃譞𨭎駖𤠒𤣻𤨕爉𤫀𠱸奥𤺥𤾆𠝹軚𥀬劏圿煱𥊙𥐙𣽊𤪧喼𥑆𥑮𦭒釔㑳𥔿𧘲𥕞䜘𥕢𥕦𥟇𤤿𥡝偦㓻𣏌惞𥤃䝼𨥈𥪮𥮉𥰆𡶐垡煑澶𦄂𧰒遖𦆲𤾚譢𦐂𦑊"],
["9c40","嵛𦯷輶𦒄𡤜諪𤧶𦒈𣿯𦔒䯀𦖿𦚵𢜛鑥𥟡憕娧晉侻嚹𤔡𦛼乪𤤴陖涏𦲽㘘襷𦞙𦡮𦐑𦡞營𦣇筂𩃀𠨑𦤦鄄𦤹穅鷰𦧺騦𦨭㙟𦑩𠀡禃𦨴𦭛崬𣔙菏𦮝䛐𦲤画补𦶮墶"],
["9ca1","㜜𢖍𧁋𧇍㱔𧊀𧊅銁𢅺𧊋錰𧋦𤧐氹钟𧑐𠻸蠧裵𢤦𨑳𡞱溸𤨪𡠠㦤㚹尐秣䔿暶𩲭𩢤襃𧟌𧡘囖䃟𡘊㦡𣜯𨃨𡏅熭荦𧧝𩆨婧䲷𧂯𨦫𧧽𧨊𧬋𧵦𤅺筃祾𨀉澵𪋟樃𨌘厢𦸇鎿栶靝𨅯𨀣𦦵𡏭𣈯𨁈嶅𨰰𨂃圕頣𨥉嶫𤦈斾槕叒𤪥𣾁㰑朶𨂐𨃴𨄮𡾡𨅏"],
["9d40","𨆉𨆯𨈚𨌆𨌯𨎊㗊𨑨𨚪䣺揦𨥖砈鉕𨦸䏲𨧧䏟𨧨𨭆𨯔姸𨰉輋𨿅𩃬筑𩄐𩄼㷷𩅞𤫊运犏嚋𩓧𩗩𩖰𩖸𩜲𩣑𩥉𩥪𩧃𩨨𩬎𩵚𩶛纟𩻸𩼣䲤镇𪊓熢𪋿䶑递𪗋䶜𠲜达嗁"],
["9da1","辺𢒰边𤪓䔉繿潖檱仪㓤𨬬𧢝㜺躀𡟵𨀤𨭬𨮙𧨾𦚯㷫𧙕𣲷𥘵𥥖亚𥺁𦉘嚿𠹭踎孭𣺈𤲞揞拐𡟶𡡻攰嘭𥱊吚𥌑㷆𩶘䱽嘢嘞罉𥻘奵𣵀蝰东𠿪𠵉𣚺脗鵞贘瘻鱅癎瞹鍅吲腈苷嘥脲萘肽嗪祢噃吖𠺝㗎嘅嗱曱𨋢㘭甴嗰喺咗啲𠱁𠲖廐𥅈𠹶𢱢"],
["9e40","𠺢麫絚嗞𡁵抝靭咔賍燶酶揼掹揾啩𢭃鱲𢺳冚㓟𠶧冧呍唞唓癦踭𦢊疱肶蠄螆裇膶萜𡃁䓬猄𤜆宐茋𦢓噻𢛴𧴯𤆣𧵳𦻐𧊶酰𡇙鈈𣳼𪚩𠺬𠻹牦𡲢䝎𤿂𧿹𠿫䃺"],
["9ea1","鱝攟𢶠䣳𤟠𩵼𠿬𠸊恢𧖣𠿭"],
["9ead","𦁈𡆇熣纎鵐业丄㕷嬍沲卧㚬㧜卽㚥𤘘墚𤭮舭呋垪𥪕𠥹"],
["9ec5","㩒𢑥獴𩺬䴉鯭𣳾𩼰䱛𤾩𩖞𩿞葜𣶶𧊲𦞳𣜠挮紥𣻷𣸬㨪逈勌㹴㙺䗩𠒎癀嫰𠺶硺𧼮墧䂿噼鮋嵴癔𪐴麅䳡痹㟻愙𣃚𤏲"],
["9ef5","噝𡊩垧𤥣𩸆刴𧂮㖭汊鵼"],
["9f40","籖鬹埞𡝬屓擓𩓐𦌵𧅤蚭𠴨𦴢𤫢𠵱"],
["9f4f","凾𡼏嶎霃𡷑麁遌笟鬂峑箣扨挵髿篏鬪籾鬮籂粆鰕篼鬉鼗鰛𤤾齚啳寃俽麘俲剠㸆勑坧偖妷帒韈鶫轜呩鞴饀鞺匬愰"],
["9fa1","椬叚鰊鴂䰻陁榀傦畆𡝭駚剳"],
["9fae","酙隁酜"],
["9fb2","酑𨺗捿𦴣櫊嘑醎畺抅𠏼獏籰𥰡𣳽"],
["9fc1","𤤙盖鮝个𠳔莾衂"],
["9fc9","届槀僭坺刟巵从氱𠇲伹咜哚劚趂㗾弌㗳"],
["9fdb","歒酼龥鮗頮颴骺麨麄煺笔"],
["9fe7","毺蠘罸"],
["9feb","嘠𪙊蹷齓"],
["9ff0","跔蹏鸜踁抂𨍽踨蹵竓𤩷稾磘泪詧瘇"],
["a040","𨩚鼦泎蟖痃𪊲硓咢贌狢獱謭猂瓱賫𤪻蘯徺袠䒷"],
["a055","𡠻𦸅"],
["a058","詾𢔛"],
["a05b","惽癧髗鵄鍮鮏蟵"],
["a063","蠏賷猬霡鮰㗖犲䰇籑饊𦅙慙䰄麖慽"],
["a073","坟慯抦戹拎㩜懢厪𣏵捤栂㗒"],
["a0a1","嵗𨯂迚𨸹"],
["a0a6","僙𡵆礆匲阸𠼻䁥"],
["a0ae","矾"],
["a0b0","糂𥼚糚稭聦聣絍甅瓲覔舚朌聢𧒆聛瓰脃眤覉𦟌畓𦻑螩蟎臈螌詉貭譃眫瓸蓚㘵榲趦"],
["a0d4","覩瑨涹蟁𤀑瓧㷛煶悤憜㳑煢恷"],
["a0e2","罱𨬭牐惩䭾删㰘𣳇𥻗𧙖𥔱𡥄𡋾𩤃𦷜𧂭峁𦆭𨨏𣙷𠃮𦡆𤼎䕢嬟𦍌齐麦𦉫"],
["a3c0","␀",31,"␡"],
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["c740","す",58,"ァアィイ"],
["c7a1","ゥ",81,"А",5,"ЁЖ",4],
["c840","Л",26,"ёж",25,"⇧↸↹㇏𠃌乚𠂊刂䒑"],
["c8a1","龰冈龱𧘇"],
["c8cd","￢￤＇＂㈱№℡゛゜⺀⺄⺆⺇⺈⺊⺌⺍⺕⺜⺝⺥⺧⺪⺬⺮⺶⺼⺾⻆⻊⻌⻍⻏⻖⻗⻞⻣"],
["c8f5","ʃɐɛɔɵœøŋʊɪ"],
["f9fe","￭"],
["fa40","𠕇鋛𠗟𣿅蕌䊵珯况㙉𤥂𨧤鍄𡧛苮𣳈砼杄拟𤤳𨦪𠊠𦮳𡌅侫𢓭倈𦴩𧪄𣘀𤪱𢔓倩𠍾徤𠎀𠍇滛𠐟偽儁㑺儎顬㝃萖𤦤𠒇兠𣎴兪𠯿𢃼𠋥𢔰𠖎𣈳𡦃宂蝽𠖳𣲙冲冸"],
["faa1","鴴凉减凑㳜凓𤪦决凢卂凭菍椾𣜭彻刋刦刼劵剗劔効勅簕蕂勠蘍𦬓包𨫞啉滙𣾀𠥔𣿬匳卄𠯢泋𡜦栛珕恊㺪㣌𡛨燝䒢卭却𨚫卾卿𡖖𡘓矦厓𨪛厠厫厮玧𥝲㽙玜叁叅汉义埾叙㪫𠮏叠𣿫𢶣叶𠱷吓灹唫晗浛呭𦭓𠵴啝咏咤䞦𡜍𠻝㶴𠵍"],
["fb40","𨦼𢚘啇䳭启琗喆喩嘅𡣗𤀺䕒𤐵暳𡂴嘷曍𣊊暤暭噍噏磱囱鞇叾圀囯园𨭦㘣𡉏坆𤆥汮炋坂㚱𦱾埦𡐖堃𡑔𤍣堦𤯵塜墪㕡壠壜𡈼壻寿坃𪅐𤉸鏓㖡够梦㛃湙"],
["fba1","𡘾娤啓𡚒蔅姉𠵎𦲁𦴪𡟜姙𡟻𡞲𦶦浱𡠨𡛕姹𦹅媫婣㛦𤦩婷㜈媖瑥嫓𦾡𢕔㶅𡤑㜲𡚸広勐孶斈孼𧨎䀄䡝𠈄寕慠𡨴𥧌𠖥寳宝䴐尅𡭄尓珎尔𡲥𦬨屉䣝岅峩峯嶋𡷹𡸷崐崘嵆𡺤岺巗苼㠭𤤁𢁉𢅳芇㠶㯂帮檊幵幺𤒼𠳓厦亷廐厨𡝱帉廴𨒂"],
["fc40","廹廻㢠廼栾鐛弍𠇁弢㫞䢮𡌺强𦢈𢏐彘𢑱彣鞽𦹮彲鍀𨨶徧嶶㵟𥉐𡽪𧃸𢙨釖𠊞𨨩怱暅𡡷㥣㷇㘹垐𢞴祱㹀悞悤悳𤦂𤦏𧩓璤僡媠慤萤慂慈𦻒憁凴𠙖憇宪𣾷"],
["fca1","𢡟懓𨮝𩥝懐㤲𢦀𢣁怣慜攞掋𠄘担𡝰拕𢸍捬𤧟㨗搸揸𡎎𡟼撐澊𢸶頔𤂌𥜝擡擥鑻㩦携㩗敍漖𤨨𤨣斅敭敟𣁾斵𤥀䬷旑䃘𡠩无旣忟𣐀昘𣇷𣇸晄𣆤𣆥晋𠹵晧𥇦晳晴𡸽𣈱𨗴𣇈𥌓矅𢣷馤朂𤎜𤨡㬫槺𣟂杞杧杢𤇍𩃭柗䓩栢湐鈼栁𣏦𦶠桝"],
["fd40","𣑯槡樋𨫟楳棃𣗍椁椀㴲㨁𣘼㮀枬楡𨩊䋼椶榘㮡𠏉荣傐槹𣙙𢄪橅𣜃檝㯳枱櫈𩆜㰍欝𠤣惞欵歴𢟍溵𣫛𠎵𡥘㝀吡𣭚毡𣻼毜氷𢒋𤣱𦭑汚舦汹𣶼䓅𣶽𤆤𤤌𤤀"],
["fda1","𣳉㛥㳫𠴲鮃𣇹𢒑羏样𦴥𦶡𦷫涖浜湼漄𤥿𤂅𦹲蔳𦽴凇沜渝萮𨬡港𣸯瑓𣾂秌湏媑𣁋濸㜍澝𣸰滺𡒗𤀽䕕鏰潄潜㵎潴𩅰㴻澟𤅄濓𤂑𤅕𤀹𣿰𣾴𤄿凟𤅖𤅗𤅀𦇝灋灾炧炁烌烕烖烟䄄㷨熴熖𤉷焫煅媈煊煮岜𤍥煏鍢𤋁焬𤑚𤨧𤨢熺𨯨炽爎"],
["fe40","鑂爕夑鑃爤鍁𥘅爮牀𤥴梽牕牗㹕𣁄栍漽犂猪猫𤠣𨠫䣭𨠄猨献珏玪𠰺𦨮珉瑉𤇢𡛧𤨤昣㛅𤦷𤦍𤧻珷琕椃𤨦琹𠗃㻗瑜𢢭瑠𨺲瑇珤瑶莹瑬㜰瑴鏱樬璂䥓𤪌"],
["fea1","𤅟𤩹𨮏孆𨰃𡢞瓈𡦈甎瓩甞𨻙𡩋寗𨺬鎅畍畊畧畮𤾂㼄𤴓疎瑝疞疴瘂瘬癑癏癯癶𦏵皐臯㟸𦤑𦤎皡皥皷盌𦾟葢𥂝𥅽𡸜眞眦着撯𥈠睘𣊬瞯𨥤𨥨𡛁矴砉𡍶𤨒棊碯磇磓隥礮𥗠磗礴碱𧘌辸袄𨬫𦂃𢘜禆褀椂禀𥡗禝𧬹礼禩渪𧄦㺨秆𩄍秔"]
]

},{}],18:[function(require,module,exports){
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["bb40","籃",9,"籎",36,"籵",5,"籾",9],
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["c380","脌脕脗脙脛脜脝脟",12,"脭脮脰脳脴脵脷脹",4,"脿谩芒茫盲氓忙莽猫茅锚毛矛铆卯茂冒帽貌贸么玫枚梅酶霉煤没眉媒镁每美昧寐妹媚门闷们萌蒙檬盟锰猛梦孟眯醚靡糜迷谜弥米秘觅泌蜜密幂棉眠绵冕免勉娩缅面苗描瞄藐秒渺庙妙蔑灭民抿皿敏悯闽明螟鸣铭名命谬摸"],
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["c680","苺苼",4,"茊茋茍茐茒茓茖茘茙茝",9,"茩茪茮茰茲茷茻茽啤脾疲皮匹痞僻屁譬篇偏片骗飘漂瓢票撇瞥拼频贫品聘乒坪苹萍平凭瓶评屏坡泼颇婆破魄迫粕剖扑铺仆莆葡菩蒲埔朴圃普浦谱曝瀑期欺栖戚妻七凄漆柒沏其棋奇歧畦崎脐齐旗祈祁骑起岂乞企启契砌器气迄弃汽泣讫掐"],
["c740","茾茿荁荂荄荅荈荊",4,"荓荕",4,"荝荢荰",6,"荹荺荾",6,"莇莈莊莋莌莍莏莐莑莔莕莖莗莙莚莝莟莡",6,"莬莭莮"],
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["c940","葽",4,"蒃蒄蒅蒆蒊蒍蒏",7,"蒘蒚蒛蒝蒞蒟蒠蒢",12,"蒰蒱蒳蒵蒶蒷蒻蒼蒾蓀蓂蓃蓅蓆蓇蓈蓋蓌蓎蓏蓒蓔蓕蓗"],
["c980","蓘",4,"蓞蓡蓢蓤蓧",4,"蓭蓮蓯蓱",10,"蓽蓾蔀蔁蔂伞散桑嗓丧搔骚扫嫂瑟色涩森僧莎砂杀刹沙纱傻啥煞筛晒珊苫杉山删煽衫闪陕擅赡膳善汕扇缮墒伤商赏晌上尚裳梢捎稍烧芍勺韶少哨邵绍奢赊蛇舌舍赦摄射慑涉社设砷申呻伸身深娠绅神沈审婶甚肾慎渗声生甥牲升绳"],
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["e140","酅酇酈酑酓酔酕酖酘酙酛酜酟酠酦酧酨酫酭酳酺酻酼醀",4,"醆醈醊醎醏醓",6,"醜",5,"醤",5,"醫醬醰醱醲醳醶醷醸醹醻"],
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["e240","釦",62],
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["fc80","鼆",4,"鼌鼏鼑鼒鼔鼕鼖鼘鼚",5,"鼡鼣",8,"鼭鼮鼰鼱"],
["fd40","鼲",4,"鼸鼺鼼鼿",4,"齅",10,"齒",38],
["fd80","齹",5,"龁龂龍",11,"龜龝龞龡",4,"郎凉秊裏隣"],
["fe40","兀嗀﨎﨏﨑﨓﨔礼﨟蘒﨡﨣﨤﨧﨨﨩"]
]

},{}],19:[function(require,module,exports){
module.exports=[
["0","\u0000",127],
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["8161","갵갶갷갺갻갽갾갿걁",9,"걌걎",5,"걕"],
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["8241","괔괕괖괗괙괚괛괝괞괟괡",7,"괪괫괮",5],
["8261","괶괷괹괺괻괽",6,"굆굈굊",5,"굑굒굓굕굖굗"],
["8281","굙",7,"굢굤",7,"굮굯굱굲굷굸굹굺굾궀궃",4,"궊궋궍궎궏궑",10,"궞",5,"궥",17,"궸",7,"귂귃귅귆귇귉",6,"귒귔",7,"귝귞귟귡귢귣귥",18],
["8341","귺귻귽귾긂",5,"긊긌긎",5,"긕",7],
["8361","긝",18,"긲긳긵긶긹긻긼"],
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["8461","꼆꼉꼊꼋꼌꼎꼏꼑",18],
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["8541","꾿꿁",5,"꿊꿌꿏",4,"꿕",6,"꿝",4],
["8561","꿢",5,"꿪",5,"꿲꿳꿵꿶꿷꿹",6,"뀂뀃"],
["8581","뀅",6,"뀍뀎뀏뀑뀒뀓뀕",6,"뀞",9,"뀩",26,"끆끇끉끋끍끏끐끑끒끖끘끚끛끜끞",29,"끾끿낁낂낃낅",6,"낎낐낒",5,"낛낝낞낣낤"],
["8641","낥낦낧낪낰낲낶낷낹낺낻낽",6,"냆냊",5,"냒"],
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["ae41","췆",5,"췍췎췏췑",16],
["ae61","췢",5,"췩췪췫췭췮췯췱",6,"췺췼췾",4],
["ae81","츃츅츆츇츉츊츋츍",6,"츕츖츗츘츚",5,"츢츣츥츦츧츩츪츫"],
["af41","츬츭츮츯츲츴츶",19],
["af61","칊",13,"칚칛칝칞칢",5,"칪칬"],
["af81","칮",5,"칶칷칹칺칻칽",6,"캆캈캊",5,"캒캓캕캖캗캙"],
["b041","캚",5,"캢캦",5,"캮",12],
["b061","캻",5,"컂",19],
["b081","컖",13,"컦컧컩컪컭",6,"컶컺",5,"가각간갇갈갉갊감",7,"같",4,"갠갤갬갭갯갰갱갸갹갼걀걋걍걔걘걜거걱건걷걸걺검겁것겄겅겆겉겊겋게겐겔겜겝겟겠겡겨격겪견겯결겸겹겻겼경곁계곈곌곕곗고곡곤곧골곪곬곯곰곱곳공곶과곽관괄괆"],
["b141","켂켃켅켆켇켉",6,"켒켔켖",5,"켝켞켟켡켢켣"],
["b161","켥",6,"켮켲",5,"켹",11],
["b181","콅",14,"콖콗콙콚콛콝",6,"콦콨콪콫콬괌괍괏광괘괜괠괩괬괭괴괵괸괼굄굅굇굉교굔굘굡굣구국군굳굴굵굶굻굼굽굿궁궂궈궉권궐궜궝궤궷귀귁귄귈귐귑귓규균귤그극근귿글긁금급긋긍긔기긱긴긷길긺김깁깃깅깆깊까깍깎깐깔깖깜깝깟깠깡깥깨깩깬깰깸"],
["b241","콭콮콯콲콳콵콶콷콹",6,"쾁쾂쾃쾄쾆",5,"쾍"],
["b261","쾎",18,"쾢",5,"쾩"],
["b281","쾪",5,"쾱",18,"쿅",6,"깹깻깼깽꺄꺅꺌꺼꺽꺾껀껄껌껍껏껐껑께껙껜껨껫껭껴껸껼꼇꼈꼍꼐꼬꼭꼰꼲꼴꼼꼽꼿꽁꽂꽃꽈꽉꽐꽜꽝꽤꽥꽹꾀꾄꾈꾐꾑꾕꾜꾸꾹꾼꿀꿇꿈꿉꿋꿍꿎꿔꿜꿨꿩꿰꿱꿴꿸뀀뀁뀄뀌뀐뀔뀜뀝뀨끄끅끈끊끌끎끓끔끕끗끙"],
["b341","쿌",19,"쿢쿣쿥쿦쿧쿩"],
["b361","쿪",5,"쿲쿴쿶",5,"쿽쿾쿿퀁퀂퀃퀅",5],
["b381","퀋",5,"퀒",5,"퀙",19,"끝끼끽낀낄낌낍낏낑나낙낚난낟날낡낢남납낫",4,"낱낳내낵낸낼냄냅냇냈냉냐냑냔냘냠냥너넉넋넌널넒넓넘넙넛넜넝넣네넥넨넬넴넵넷넸넹녀녁년녈념녑녔녕녘녜녠노녹논놀놂놈놉놋농높놓놔놘놜놨뇌뇐뇔뇜뇝"],
["b441","퀮",5,"퀶퀷퀹퀺퀻퀽",6,"큆큈큊",5],
["b461","큑큒큓큕큖큗큙",6,"큡",10,"큮큯"],
["b481","큱큲큳큵",6,"큾큿킀킂",18,"뇟뇨뇩뇬뇰뇹뇻뇽누눅눈눋눌눔눕눗눙눠눴눼뉘뉜뉠뉨뉩뉴뉵뉼늄늅늉느늑는늘늙늚늠늡늣능늦늪늬늰늴니닉닌닐닒님닙닛닝닢다닥닦단닫",4,"닳담답닷",4,"닿대댁댄댈댐댑댓댔댕댜더덕덖던덛덜덞덟덤덥"],
["b541","킕",14,"킦킧킩킪킫킭",5],
["b561","킳킶킸킺",5,"탂탃탅탆탇탊",5,"탒탖",4],
["b581","탛탞탟탡탢탣탥",6,"탮탲",5,"탹",11,"덧덩덫덮데덱덴델뎀뎁뎃뎄뎅뎌뎐뎔뎠뎡뎨뎬도독돈돋돌돎돐돔돕돗동돛돝돠돤돨돼됐되된될됨됩됫됴두둑둔둘둠둡둣둥둬뒀뒈뒝뒤뒨뒬뒵뒷뒹듀듄듈듐듕드득든듣들듦듬듭듯등듸디딕딘딛딜딤딥딧딨딩딪따딱딴딸"],
["b641","턅",7,"턎",17],
["b661","턠",15,"턲턳턵턶턷턹턻턼턽턾"],
["b681","턿텂텆",5,"텎텏텑텒텓텕",6,"텞텠텢",5,"텩텪텫텭땀땁땃땄땅땋때땍땐땔땜땝땟땠땡떠떡떤떨떪떫떰떱떳떴떵떻떼떽뗀뗄뗌뗍뗏뗐뗑뗘뗬또똑똔똘똥똬똴뙈뙤뙨뚜뚝뚠뚤뚫뚬뚱뛔뛰뛴뛸뜀뜁뜅뜨뜩뜬뜯뜰뜸뜹뜻띄띈띌띔띕띠띤띨띰띱띳띵라락란랄람랍랏랐랑랒랖랗"],
["b741","텮",13,"텽",6,"톅톆톇톉톊"],
["b761","톋",20,"톢톣톥톦톧"],
["b781","톩",6,"톲톴톶톷톸톹톻톽톾톿퇁",14,"래랙랜랠램랩랫랬랭랴략랸럇량러럭런럴럼럽럿렀렁렇레렉렌렐렘렙렛렝려력련렬렴렵렷렸령례롄롑롓로록론롤롬롭롯롱롸롼뢍뢨뢰뢴뢸룀룁룃룅료룐룔룝룟룡루룩룬룰룸룹룻룽뤄뤘뤠뤼뤽륀륄륌륏륑류륙륜률륨륩"],
["b841","퇐",7,"퇙",17],
["b861","퇫",8,"퇵퇶퇷퇹",13],
["b881","툈툊",5,"툑",24,"륫륭르륵른를름릅릇릉릊릍릎리릭린릴림립릿링마막만많",4,"맘맙맛망맞맡맣매맥맨맬맴맵맷맸맹맺먀먁먈먕머먹먼멀멂멈멉멋멍멎멓메멕멘멜멤멥멧멨멩며멱면멸몃몄명몇몌모목몫몬몰몲몸몹못몽뫄뫈뫘뫙뫼"],
["b941","툪툫툮툯툱툲툳툵",6,"툾퉀퉂",5,"퉉퉊퉋퉌"],
["b961","퉍",14,"퉝",6,"퉥퉦퉧퉨"],
["b981","퉩",22,"튂튃튅튆튇튉튊튋튌묀묄묍묏묑묘묜묠묩묫무묵묶문묻물묽묾뭄뭅뭇뭉뭍뭏뭐뭔뭘뭡뭣뭬뮈뮌뮐뮤뮨뮬뮴뮷므믄믈믐믓미믹민믿밀밂밈밉밋밌밍및밑바",4,"받",4,"밤밥밧방밭배백밴밸뱀뱁뱃뱄뱅뱉뱌뱍뱐뱝버벅번벋벌벎범법벗"],
["ba41","튍튎튏튒튓튔튖",5,"튝튞튟튡튢튣튥",6,"튭"],
["ba61","튮튯튰튲",5,"튺튻튽튾틁틃",4,"틊틌",5],
["ba81","틒틓틕틖틗틙틚틛틝",6,"틦",9,"틲틳틵틶틷틹틺벙벚베벡벤벧벨벰벱벳벴벵벼벽변별볍볏볐병볕볘볜보복볶본볼봄봅봇봉봐봔봤봬뵀뵈뵉뵌뵐뵘뵙뵤뵨부북분붇불붉붊붐붑붓붕붙붚붜붤붰붸뷔뷕뷘뷜뷩뷰뷴뷸븀븃븅브븍븐블븜븝븟비빅빈빌빎빔빕빗빙빚빛빠빡빤"],
["bb41","틻",4,"팂팄팆",5,"팏팑팒팓팕팗",4,"팞팢팣"],
["bb61","팤팦팧팪팫팭팮팯팱",6,"팺팾",5,"퍆퍇퍈퍉"],
["bb81","퍊",31,"빨빪빰빱빳빴빵빻빼빽뺀뺄뺌뺍뺏뺐뺑뺘뺙뺨뻐뻑뻔뻗뻘뻠뻣뻤뻥뻬뼁뼈뼉뼘뼙뼛뼜뼝뽀뽁뽄뽈뽐뽑뽕뾔뾰뿅뿌뿍뿐뿔뿜뿟뿡쀼쁑쁘쁜쁠쁨쁩삐삑삔삘삠삡삣삥사삭삯산삳살삵삶삼삽삿샀상샅새색샌샐샘샙샛샜생샤"],
["bc41","퍪",17,"퍾퍿펁펂펃펅펆펇"],
["bc61","펈펉펊펋펎펒",5,"펚펛펝펞펟펡",6,"펪펬펮"],
["bc81","펯",4,"펵펶펷펹펺펻펽",6,"폆폇폊",5,"폑",5,"샥샨샬샴샵샷샹섀섄섈섐섕서",4,"섣설섦섧섬섭섯섰성섶세섹센셀셈셉셋셌셍셔셕션셜셤셥셧셨셩셰셴셸솅소속솎손솔솖솜솝솟송솥솨솩솬솰솽쇄쇈쇌쇔쇗쇘쇠쇤쇨쇰쇱쇳쇼쇽숀숄숌숍숏숑수숙순숟술숨숩숫숭"],
["bd41","폗폙",7,"폢폤",7,"폮폯폱폲폳폵폶폷"],
["bd61","폸폹폺폻폾퐀퐂",5,"퐉",13],
["bd81","퐗",5,"퐞",25,"숯숱숲숴쉈쉐쉑쉔쉘쉠쉥쉬쉭쉰쉴쉼쉽쉿슁슈슉슐슘슛슝스슥슨슬슭슴습슷승시식신싣실싫심십싯싱싶싸싹싻싼쌀쌈쌉쌌쌍쌓쌔쌕쌘쌜쌤쌥쌨쌩썅써썩썬썰썲썸썹썼썽쎄쎈쎌쏀쏘쏙쏜쏟쏠쏢쏨쏩쏭쏴쏵쏸쐈쐐쐤쐬쐰"],
["be41","퐸",7,"푁푂푃푅",14],
["be61","푔",7,"푝푞푟푡푢푣푥",7,"푮푰푱푲"],
["be81","푳",4,"푺푻푽푾풁풃",4,"풊풌풎",5,"풕",8,"쐴쐼쐽쑈쑤쑥쑨쑬쑴쑵쑹쒀쒔쒜쒸쒼쓩쓰쓱쓴쓸쓺쓿씀씁씌씐씔씜씨씩씬씰씸씹씻씽아악안앉않알앍앎앓암압앗았앙앝앞애액앤앨앰앱앳앴앵야약얀얄얇얌얍얏양얕얗얘얜얠얩어억언얹얻얼얽얾엄",6,"엌엎"],
["bf41","풞",10,"풪",14],
["bf61","풹",18,"퓍퓎퓏퓑퓒퓓퓕"],
["bf81","퓖",5,"퓝퓞퓠",7,"퓩퓪퓫퓭퓮퓯퓱",6,"퓹퓺퓼에엑엔엘엠엡엣엥여역엮연열엶엷염",5,"옅옆옇예옌옐옘옙옛옜오옥온올옭옮옰옳옴옵옷옹옻와왁완왈왐왑왓왔왕왜왝왠왬왯왱외왹왼욀욈욉욋욍요욕욘욜욤욥욧용우욱운울욹욺움웁웃웅워웍원월웜웝웠웡웨"],
["c041","퓾",5,"픅픆픇픉픊픋픍",6,"픖픘",5],
["c061","픞",25],
["c081","픸픹픺픻픾픿핁핂핃핅",6,"핎핐핒",5,"핚핛핝핞핟핡핢핣웩웬웰웸웹웽위윅윈윌윔윕윗윙유육윤율윰윱윳융윷으윽은을읊음읍읏응",7,"읜읠읨읫이익인일읽읾잃임입잇있잉잊잎자작잔잖잗잘잚잠잡잣잤장잦재잭잰잴잼잽잿쟀쟁쟈쟉쟌쟎쟐쟘쟝쟤쟨쟬저적전절젊"],
["c141","핤핦핧핪핬핮",5,"핶핷핹핺핻핽",6,"햆햊햋"],
["c161","햌햍햎햏햑",19,"햦햧"],
["c181","햨",31,"점접젓정젖제젝젠젤젬젭젯젱져젼졀졈졉졌졍졔조족존졸졺좀좁좃종좆좇좋좌좍좔좝좟좡좨좼좽죄죈죌죔죕죗죙죠죡죤죵주죽준줄줅줆줌줍줏중줘줬줴쥐쥑쥔쥘쥠쥡쥣쥬쥰쥴쥼즈즉즌즐즘즙즛증지직진짇질짊짐집짓"],
["c241","헊헋헍헎헏헑헓",4,"헚헜헞",5,"헦헧헩헪헫헭헮"],
["c261","헯",4,"헶헸헺",5,"혂혃혅혆혇혉",6,"혒"],
["c281","혖",5,"혝혞혟혡혢혣혥",7,"혮",9,"혺혻징짖짙짚짜짝짠짢짤짧짬짭짯짰짱째짹짼쨀쨈쨉쨋쨌쨍쨔쨘쨩쩌쩍쩐쩔쩜쩝쩟쩠쩡쩨쩽쪄쪘쪼쪽쫀쫄쫌쫍쫏쫑쫓쫘쫙쫠쫬쫴쬈쬐쬔쬘쬠쬡쭁쭈쭉쭌쭐쭘쭙쭝쭤쭸쭹쮜쮸쯔쯤쯧쯩찌찍찐찔찜찝찡찢찧차착찬찮찰참찹찻"],
["c341","혽혾혿홁홂홃홄홆홇홊홌홎홏홐홒홓홖홗홙홚홛홝",4],
["c361","홢",4,"홨홪",5,"홲홳홵",11],
["c381","횁횂횄횆",5,"횎횏횑횒횓횕",7,"횞횠횢",5,"횩횪찼창찾채책챈챌챔챕챗챘챙챠챤챦챨챰챵처척천철첨첩첫첬청체첵첸첼쳄쳅쳇쳉쳐쳔쳤쳬쳰촁초촉촌촐촘촙촛총촤촨촬촹최쵠쵤쵬쵭쵯쵱쵸춈추축춘출춤춥춧충춰췄췌췐취췬췰췸췹췻췽츄츈츌츔츙츠측츤츨츰츱츳층"],
["c441","횫횭횮횯횱",7,"횺횼",7,"훆훇훉훊훋"],
["c461","훍훎훏훐훒훓훕훖훘훚",5,"훡훢훣훥훦훧훩",4],
["c481","훮훯훱훲훳훴훶",5,"훾훿휁휂휃휅",11,"휒휓휔치칙친칟칠칡침칩칫칭카칵칸칼캄캅캇캉캐캑캔캘캠캡캣캤캥캬캭컁커컥컨컫컬컴컵컷컸컹케켁켄켈켐켑켓켕켜켠켤켬켭켯켰켱켸코콕콘콜콤콥콧콩콰콱콴콸쾀쾅쾌쾡쾨쾰쿄쿠쿡쿤쿨쿰쿱쿳쿵쿼퀀퀄퀑퀘퀭퀴퀵퀸퀼"],
["c541","휕휖휗휚휛휝휞휟휡",6,"휪휬휮",5,"휶휷휹"],
["c561","휺휻휽",6,"흅흆흈흊",5,"흒흓흕흚",4],
["c581","흟흢흤흦흧흨흪흫흭흮흯흱흲흳흵",6,"흾흿힀힂",5,"힊힋큄큅큇큉큐큔큘큠크큭큰클큼큽킁키킥킨킬킴킵킷킹타탁탄탈탉탐탑탓탔탕태택탠탤탬탭탯탰탱탸턍터턱턴털턺텀텁텃텄텅테텍텐텔템텝텟텡텨텬텼톄톈토톡톤톨톰톱톳통톺톼퇀퇘퇴퇸툇툉툐투툭툰툴툼툽툿퉁퉈퉜"],
["c641","힍힎힏힑",6,"힚힜힞",5],
["c6a1","퉤튀튁튄튈튐튑튕튜튠튤튬튱트특튼튿틀틂틈틉틋틔틘틜틤틥티틱틴틸팀팁팃팅파팍팎판팔팖팜팝팟팠팡팥패팩팬팰팸팹팻팼팽퍄퍅퍼퍽펀펄펌펍펏펐펑페펙펜펠펨펩펫펭펴편펼폄폅폈평폐폘폡폣포폭폰폴폼폽폿퐁"],
["c7a1","퐈퐝푀푄표푠푤푭푯푸푹푼푿풀풂품풉풋풍풔풩퓌퓐퓔퓜퓟퓨퓬퓰퓸퓻퓽프픈플픔픕픗피픽핀필핌핍핏핑하학한할핥함합핫항해핵핸핼햄햅햇했행햐향허헉헌헐헒험헙헛헝헤헥헨헬헴헵헷헹혀혁현혈혐협혓혔형혜혠"],
["c8a1","혤혭호혹혼홀홅홈홉홋홍홑화확환활홧황홰홱홴횃횅회획횐횔횝횟횡효횬횰횹횻후훅훈훌훑훔훗훙훠훤훨훰훵훼훽휀휄휑휘휙휜휠휨휩휫휭휴휵휸휼흄흇흉흐흑흔흖흗흘흙흠흡흣흥흩희흰흴흼흽힁히힉힌힐힘힙힛힝"],
["caa1","伽佳假價加可呵哥嘉嫁家暇架枷柯歌珂痂稼苛茄街袈訶賈跏軻迦駕刻却各恪慤殼珏脚覺角閣侃刊墾奸姦干幹懇揀杆柬桿澗癎看磵稈竿簡肝艮艱諫間乫喝曷渴碣竭葛褐蝎鞨勘坎堪嵌感憾戡敢柑橄減甘疳監瞰紺邯鑑鑒龕"],
["cba1","匣岬甲胛鉀閘剛堈姜岡崗康强彊慷江畺疆糠絳綱羌腔舡薑襁講鋼降鱇介价個凱塏愷愾慨改槪漑疥皆盖箇芥蓋豈鎧開喀客坑更粳羹醵倨去居巨拒据據擧渠炬祛距踞車遽鉅鋸乾件健巾建愆楗腱虔蹇鍵騫乞傑杰桀儉劍劒檢"],
["cca1","瞼鈐黔劫怯迲偈憩揭擊格檄激膈覡隔堅牽犬甄絹繭肩見譴遣鵑抉決潔結缺訣兼慊箝謙鉗鎌京俓倞傾儆勁勍卿坰境庚徑慶憬擎敬景暻更梗涇炅烱璟璥瓊痙硬磬竟競絅經耕耿脛莖警輕逕鏡頃頸驚鯨係啓堺契季屆悸戒桂械"],
["cda1","棨溪界癸磎稽系繫繼計誡谿階鷄古叩告呱固姑孤尻庫拷攷故敲暠枯槁沽痼皐睾稿羔考股膏苦苽菰藁蠱袴誥賈辜錮雇顧高鼓哭斛曲梏穀谷鵠困坤崑昆梱棍滾琨袞鯤汨滑骨供公共功孔工恐恭拱控攻珙空蚣貢鞏串寡戈果瓜"],
["cea1","科菓誇課跨過鍋顆廓槨藿郭串冠官寬慣棺款灌琯瓘管罐菅觀貫關館刮恝括适侊光匡壙廣曠洸炚狂珖筐胱鑛卦掛罫乖傀塊壞怪愧拐槐魁宏紘肱轟交僑咬喬嬌嶠巧攪敎校橋狡皎矯絞翹膠蕎蛟較轎郊餃驕鮫丘久九仇俱具勾"],
["cfa1","區口句咎嘔坵垢寇嶇廐懼拘救枸柩構歐毆毬求溝灸狗玖球瞿矩究絿耉臼舅舊苟衢謳購軀逑邱鉤銶駒驅鳩鷗龜國局菊鞠鞫麴君窘群裙軍郡堀屈掘窟宮弓穹窮芎躬倦券勸卷圈拳捲權淃眷厥獗蕨蹶闕机櫃潰詭軌饋句晷歸貴"],
["d0a1","鬼龜叫圭奎揆槻珪硅窺竅糾葵規赳逵閨勻均畇筠菌鈞龜橘克剋劇戟棘極隙僅劤勤懃斤根槿瑾筋芹菫覲謹近饉契今妗擒昑檎琴禁禽芩衾衿襟金錦伋及急扱汲級給亘兢矜肯企伎其冀嗜器圻基埼夔奇妓寄岐崎己幾忌技旗旣"],
["d1a1","朞期杞棋棄機欺氣汽沂淇玘琦琪璂璣畸畿碁磯祁祇祈祺箕紀綺羈耆耭肌記譏豈起錡錤飢饑騎騏驥麒緊佶吉拮桔金喫儺喇奈娜懦懶拏拿癩",5,"那樂",4,"諾酪駱亂卵暖欄煖爛蘭難鸞捏捺南嵐枏楠湳濫男藍襤拉"],
["d2a1","納臘蠟衲囊娘廊",4,"乃來內奈柰耐冷女年撚秊念恬拈捻寧寗努勞奴弩怒擄櫓爐瑙盧",5,"駑魯",10,"濃籠聾膿農惱牢磊腦賂雷尿壘",7,"嫩訥杻紐勒",5,"能菱陵尼泥匿溺多茶"],
["d3a1","丹亶但單團壇彖斷旦檀段湍短端簞緞蛋袒鄲鍛撻澾獺疸達啖坍憺擔曇淡湛潭澹痰聃膽蕁覃談譚錟沓畓答踏遝唐堂塘幢戇撞棠當糖螳黨代垈坮大對岱帶待戴擡玳臺袋貸隊黛宅德悳倒刀到圖堵塗導屠島嶋度徒悼挑掉搗桃"],
["d4a1","棹櫂淘渡滔濤燾盜睹禱稻萄覩賭跳蹈逃途道都鍍陶韜毒瀆牘犢獨督禿篤纛讀墩惇敦旽暾沌焞燉豚頓乭突仝冬凍動同憧東桐棟洞潼疼瞳童胴董銅兜斗杜枓痘竇荳讀豆逗頭屯臀芚遁遯鈍得嶝橙燈登等藤謄鄧騰喇懶拏癩羅"],
["d5a1","蘿螺裸邏樂洛烙珞絡落諾酪駱丹亂卵欄欒瀾爛蘭鸞剌辣嵐擥攬欖濫籃纜藍襤覽拉臘蠟廊朗浪狼琅瑯螂郞來崍徠萊冷掠略亮倆兩凉梁樑粮粱糧良諒輛量侶儷勵呂廬慮戾旅櫚濾礪藜蠣閭驢驪麗黎力曆歷瀝礫轢靂憐戀攣漣"],
["d6a1","煉璉練聯蓮輦連鍊冽列劣洌烈裂廉斂殮濂簾獵令伶囹寧岺嶺怜玲笭羚翎聆逞鈴零靈領齡例澧禮醴隷勞怒撈擄櫓潞瀘爐盧老蘆虜路輅露魯鷺鹵碌祿綠菉錄鹿麓論壟弄朧瀧瓏籠聾儡瀨牢磊賂賚賴雷了僚寮廖料燎療瞭聊蓼"],
["d7a1","遼鬧龍壘婁屢樓淚漏瘻累縷蔞褸鏤陋劉旒柳榴流溜瀏琉瑠留瘤硫謬類六戮陸侖倫崙淪綸輪律慄栗率隆勒肋凜凌楞稜綾菱陵俚利厘吏唎履悧李梨浬犁狸理璃異痢籬罹羸莉裏裡里釐離鯉吝潾燐璘藺躪隣鱗麟林淋琳臨霖砬"],
["d8a1","立笠粒摩瑪痲碼磨馬魔麻寞幕漠膜莫邈万卍娩巒彎慢挽晩曼滿漫灣瞞萬蔓蠻輓饅鰻唜抹末沫茉襪靺亡妄忘忙望網罔芒茫莽輞邙埋妹媒寐昧枚梅每煤罵買賣邁魅脈貊陌驀麥孟氓猛盲盟萌冪覓免冕勉棉沔眄眠綿緬面麵滅"],
["d9a1","蔑冥名命明暝椧溟皿瞑茗蓂螟酩銘鳴袂侮冒募姆帽慕摸摹暮某模母毛牟牡瑁眸矛耗芼茅謀謨貌木沐牧目睦穆鶩歿沒夢朦蒙卯墓妙廟描昴杳渺猫竗苗錨務巫憮懋戊拇撫无楙武毋無珷畝繆舞茂蕪誣貿霧鵡墨默們刎吻問文"],
["daa1","汶紊紋聞蚊門雯勿沕物味媚尾嵋彌微未梶楣渼湄眉米美薇謎迷靡黴岷悶愍憫敏旻旼民泯玟珉緡閔密蜜謐剝博拍搏撲朴樸泊珀璞箔粕縛膊舶薄迫雹駁伴半反叛拌搬攀斑槃泮潘班畔瘢盤盼磐磻礬絆般蟠返頒飯勃拔撥渤潑"],
["dba1","發跋醱鉢髮魃倣傍坊妨尨幇彷房放方旁昉枋榜滂磅紡肪膀舫芳蒡蚌訪謗邦防龐倍俳北培徘拜排杯湃焙盃背胚裴裵褙賠輩配陪伯佰帛柏栢白百魄幡樊煩燔番磻繁蕃藩飜伐筏罰閥凡帆梵氾汎泛犯範范法琺僻劈壁擘檗璧癖"],
["dca1","碧蘗闢霹便卞弁變辨辯邊別瞥鱉鼈丙倂兵屛幷昞昺柄棅炳甁病秉竝輧餠騈保堡報寶普步洑湺潽珤甫菩補褓譜輔伏僕匐卜宓復服福腹茯蔔複覆輹輻馥鰒本乶俸奉封峯峰捧棒烽熢琫縫蓬蜂逢鋒鳳不付俯傅剖副否咐埠夫婦"],
["dda1","孚孵富府復扶敷斧浮溥父符簿缶腐腑膚艀芙莩訃負賦賻赴趺部釜阜附駙鳧北分吩噴墳奔奮忿憤扮昐汾焚盆粉糞紛芬賁雰不佛弗彿拂崩朋棚硼繃鵬丕備匕匪卑妃婢庇悲憊扉批斐枇榧比毖毗毘沸泌琵痺砒碑秕秘粃緋翡肥"],
["dea1","脾臂菲蜚裨誹譬費鄙非飛鼻嚬嬪彬斌檳殯浜濱瀕牝玭貧賓頻憑氷聘騁乍事些仕伺似使俟僿史司唆嗣四士奢娑寫寺射巳師徙思捨斜斯柶査梭死沙泗渣瀉獅砂社祀祠私篩紗絲肆舍莎蓑蛇裟詐詞謝賜赦辭邪飼駟麝削數朔索"],
["dfa1","傘刪山散汕珊産疝算蒜酸霰乷撒殺煞薩三參杉森渗芟蔘衫揷澁鈒颯上傷像償商喪嘗孀尙峠常床庠廂想桑橡湘爽牀狀相祥箱翔裳觴詳象賞霜塞璽賽嗇塞穡索色牲生甥省笙墅壻嶼序庶徐恕抒捿敍暑曙書栖棲犀瑞筮絮緖署"],
["e0a1","胥舒薯西誓逝鋤黍鼠夕奭席惜昔晳析汐淅潟石碩蓆釋錫仙僊先善嬋宣扇敾旋渲煽琁瑄璇璿癬禪線繕羨腺膳船蘚蟬詵跣選銑鐥饍鮮卨屑楔泄洩渫舌薛褻設說雪齧剡暹殲纖蟾贍閃陝攝涉燮葉城姓宬性惺成星晟猩珹盛省筬"],
["e1a1","聖聲腥誠醒世勢歲洗稅笹細說貰召嘯塑宵小少巢所掃搔昭梳沼消溯瀟炤燒甦疏疎瘙笑篠簫素紹蔬蕭蘇訴逍遡邵銷韶騷俗屬束涑粟續謖贖速孫巽損蓀遜飡率宋悚松淞訟誦送頌刷殺灑碎鎖衰釗修受嗽囚垂壽嫂守岫峀帥愁"],
["e2a1","戍手授搜收數樹殊水洙漱燧狩獸琇璲瘦睡秀穗竪粹綏綬繡羞脩茱蒐蓚藪袖誰讐輸遂邃酬銖銹隋隧隨雖需須首髓鬚叔塾夙孰宿淑潚熟琡璹肅菽巡徇循恂旬栒楯橓殉洵淳珣盾瞬筍純脣舜荀蓴蕣詢諄醇錞順馴戌術述鉥崇崧"],
["e3a1","嵩瑟膝蝨濕拾習褶襲丞乘僧勝升承昇繩蠅陞侍匙嘶始媤尸屎屍市弑恃施是時枾柴猜矢示翅蒔蓍視試詩諡豕豺埴寔式息拭植殖湜熄篒蝕識軾食飾伸侁信呻娠宸愼新晨燼申神紳腎臣莘薪藎蜃訊身辛辰迅失室實悉審尋心沁"],
["e4a1","沈深瀋甚芯諶什十拾雙氏亞俄兒啞娥峨我牙芽莪蛾衙訝阿雅餓鴉鵝堊岳嶽幄惡愕握樂渥鄂鍔顎鰐齷安岸按晏案眼雁鞍顔鮟斡謁軋閼唵岩巖庵暗癌菴闇壓押狎鴨仰央怏昻殃秧鴦厓哀埃崖愛曖涯碍艾隘靄厄扼掖液縊腋額"],
["e5a1","櫻罌鶯鸚也倻冶夜惹揶椰爺耶若野弱掠略約若葯蒻藥躍亮佯兩凉壤孃恙揚攘敭暘梁楊樣洋瀁煬痒瘍禳穰糧羊良襄諒讓釀陽量養圄御於漁瘀禦語馭魚齬億憶抑檍臆偃堰彦焉言諺孼蘖俺儼嚴奄掩淹嶪業円予余勵呂女如廬"],
["e6a1","旅歟汝濾璵礖礪與艅茹輿轝閭餘驪麗黎亦力域役易曆歷疫繹譯轢逆驛嚥堧姸娟宴年延憐戀捐挻撚椽沇沿涎涓淵演漣烟然煙煉燃燕璉硏硯秊筵緣練縯聯衍軟輦蓮連鉛鍊鳶列劣咽悅涅烈熱裂說閱厭廉念捻染殮炎焰琰艶苒"],
["e7a1","簾閻髥鹽曄獵燁葉令囹塋寧嶺嶸影怜映暎楹榮永泳渶潁濚瀛瀯煐營獰玲瑛瑩瓔盈穎纓羚聆英詠迎鈴鍈零霙靈領乂倪例刈叡曳汭濊猊睿穢芮藝蘂禮裔詣譽豫醴銳隸霓預五伍俉傲午吾吳嗚塢墺奧娛寤悟惡懊敖旿晤梧汚澳"],
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["d740","耞耛聇聃聈脘脥脙脛脭脟脬脞脡脕脧脝脢舑舸舳舺舴舲艴莐莣莨莍荺荳莤荴莏莁莕莙荵莔莩荽莃莌莝莛莪莋荾莥莯莈莗莰荿莦莇莮荶莚虙虖蚿蚷"],
["d7a1","蛂蛁蛅蚺蚰蛈蚹蚳蚸蛌蚴蚻蚼蛃蚽蚾衒袉袕袨袢袪袚袑袡袟袘袧袙袛袗袤袬袌袓袎覂觖觙觕訰訧訬訞谹谻豜豝豽貥赽赻赹趼跂趹趿跁軘軞軝軜軗軠軡逤逋逑逜逌逡郯郪郰郴郲郳郔郫郬郩酖酘酚酓酕釬釴釱釳釸釤釹釪"],
["d840","釫釷釨釮镺閆閈陼陭陫陱陯隿靪頄飥馗傛傕傔傞傋傣傃傌傎傝偨傜傒傂傇兟凔匒匑厤厧喑喨喥喭啷噅喢喓喈喏喵喁喣喒喤啽喌喦啿喕喡喎圌堩堷"],
["d8a1","堙堞堧堣堨埵塈堥堜堛堳堿堶堮堹堸堭堬堻奡媯媔媟婺媢媞婸媦婼媥媬媕媮娷媄媊媗媃媋媩婻婽媌媜媏媓媝寪寍寋寔寑寊寎尌尰崷嵃嵫嵁嵋崿崵嵑嵎嵕崳崺嵒崽崱嵙嵂崹嵉崸崼崲崶嵀嵅幄幁彘徦徥徫惉悹惌惢惎惄愔"],
["d940","惲愊愖愅惵愓惸惼惾惁愃愘愝愐惿愄愋扊掔掱掰揎揥揨揯揃撝揳揊揠揶揕揲揵摡揟掾揝揜揄揘揓揂揇揌揋揈揰揗揙攲敧敪敤敜敨敥斌斝斞斮旐旒"],
["d9a1","晼晬晻暀晱晹晪晲朁椌棓椄棜椪棬棪棱椏棖棷棫棤棶椓椐棳棡椇棌椈楰梴椑棯棆椔棸棐棽棼棨椋椊椗棎棈棝棞棦棴棑椆棔棩椕椥棇欹欻欿欼殔殗殙殕殽毰毲毳氰淼湆湇渟湉溈渼渽湅湢渫渿湁湝湳渜渳湋湀湑渻渃渮湞"],
["da40","湨湜湡渱渨湠湱湫渹渢渰湓湥渧湸湤湷湕湹湒湦渵渶湚焠焞焯烻焮焱焣焥焢焲焟焨焺焛牋牚犈犉犆犅犋猒猋猰猢猱猳猧猲猭猦猣猵猌琮琬琰琫琖"],
["daa1","琚琡琭琱琤琣琝琩琠琲瓻甯畯畬痧痚痡痦痝痟痤痗皕皒盚睆睇睄睍睅睊睎睋睌矞矬硠硤硥硜硭硱硪确硰硩硨硞硢祴祳祲祰稂稊稃稌稄窙竦竤筊笻筄筈筌筎筀筘筅粢粞粨粡絘絯絣絓絖絧絪絏絭絜絫絒絔絩絑絟絎缾缿罥"],
["db40","罦羢羠羡翗聑聏聐胾胔腃腊腒腏腇脽腍脺臦臮臷臸臹舄舼舽舿艵茻菏菹萣菀菨萒菧菤菼菶萐菆菈菫菣莿萁菝菥菘菿菡菋菎菖菵菉萉萏菞萑萆菂菳"],
["dba1","菕菺菇菑菪萓菃菬菮菄菻菗菢萛菛菾蛘蛢蛦蛓蛣蛚蛪蛝蛫蛜蛬蛩蛗蛨蛑衈衖衕袺裗袹袸裀袾袶袼袷袽袲褁裉覕覘覗觝觚觛詎詍訹詙詀詗詘詄詅詒詈詑詊詌詏豟貁貀貺貾貰貹貵趄趀趉跘跓跍跇跖跜跏跕跙跈跗跅軯軷軺"],
["dc40","軹軦軮軥軵軧軨軶軫軱軬軴軩逭逴逯鄆鄬鄄郿郼鄈郹郻鄁鄀鄇鄅鄃酡酤酟酢酠鈁鈊鈥鈃鈚鈦鈏鈌鈀鈒釿釽鈆鈄鈧鈂鈜鈤鈙鈗鈅鈖镻閍閌閐隇陾隈"],
["dca1","隉隃隀雂雈雃雱雰靬靰靮頇颩飫鳦黹亃亄亶傽傿僆傮僄僊傴僈僂傰僁傺傱僋僉傶傸凗剺剸剻剼嗃嗛嗌嗐嗋嗊嗝嗀嗔嗄嗩喿嗒喍嗏嗕嗢嗖嗈嗲嗍嗙嗂圔塓塨塤塏塍塉塯塕塎塝塙塥塛堽塣塱壼嫇嫄嫋媺媸媱媵媰媿嫈媻嫆"],
["dd40","媷嫀嫊媴媶嫍媹媐寖寘寙尟尳嵱嵣嵊嵥嵲嵬嵞嵨嵧嵢巰幏幎幊幍幋廅廌廆廋廇彀徯徭惷慉慊愫慅愶愲愮慆愯慏愩慀戠酨戣戥戤揅揱揫搐搒搉搠搤"],
["dda1","搳摃搟搕搘搹搷搢搣搌搦搰搨摁搵搯搊搚摀搥搧搋揧搛搮搡搎敯斒旓暆暌暕暐暋暊暙暔晸朠楦楟椸楎楢楱椿楅楪椹楂楗楙楺楈楉椵楬椳椽楥棰楸椴楩楀楯楄楶楘楁楴楌椻楋椷楜楏楑椲楒椯楻椼歆歅歃歂歈歁殛嗀毻毼"],
["de40","毹毷毸溛滖滈溏滀溟溓溔溠溱溹滆滒溽滁溞滉溷溰滍溦滏溲溾滃滜滘溙溒溎溍溤溡溿溳滐滊溗溮溣煇煔煒煣煠煁煝煢煲煸煪煡煂煘煃煋煰煟煐煓"],
["dea1","煄煍煚牏犍犌犑犐犎猼獂猻猺獀獊獉瑄瑊瑋瑒瑑瑗瑀瑏瑐瑎瑂瑆瑍瑔瓡瓿瓾瓽甝畹畷榃痯瘏瘃痷痾痼痹痸瘐痻痶痭痵痽皙皵盝睕睟睠睒睖睚睩睧睔睙睭矠碇碚碔碏碄碕碅碆碡碃硹碙碀碖硻祼禂祽祹稑稘稙稒稗稕稢稓"],
["df40","稛稐窣窢窞竫筦筤筭筴筩筲筥筳筱筰筡筸筶筣粲粴粯綈綆綀綍絿綅絺綎絻綃絼綌綔綄絽綒罭罫罧罨罬羦羥羧翛翜耡腤腠腷腜腩腛腢腲朡腞腶腧腯"],
["dfa1","腄腡舝艉艄艀艂艅蓱萿葖葶葹蒏蒍葥葑葀蒆葧萰葍葽葚葙葴葳葝蔇葞萷萺萴葺葃葸萲葅萩菙葋萯葂萭葟葰萹葎葌葒葯蓅蒎萻葇萶萳葨葾葄萫葠葔葮葐蜋蜄蛷蜌蛺蛖蛵蝍蛸蜎蜉蜁蛶蜍蜅裖裋裍裎裞裛裚裌裐覅覛觟觥觤"],
["e040","觡觠觢觜触詶誆詿詡訿詷誂誄詵誃誁詴詺谼豋豊豥豤豦貆貄貅賌赨赩趑趌趎趏趍趓趔趐趒跰跠跬跱跮跐跩跣跢跧跲跫跴輆軿輁輀輅輇輈輂輋遒逿"],
["e0a1","遄遉逽鄐鄍鄏鄑鄖鄔鄋鄎酮酯鉈鉒鈰鈺鉦鈳鉥鉞銃鈮鉊鉆鉭鉬鉏鉠鉧鉯鈶鉡鉰鈱鉔鉣鉐鉲鉎鉓鉌鉖鈲閟閜閞閛隒隓隑隗雎雺雽雸雵靳靷靸靲頏頍頎颬飶飹馯馲馰馵骭骫魛鳪鳭鳧麀黽僦僔僗僨僳僛僪僝僤僓僬僰僯僣僠"],
["e140","凘劀劁勩勫匰厬嘧嘕嘌嘒嗼嘏嘜嘁嘓嘂嗺嘝嘄嗿嗹墉塼墐墘墆墁塿塴墋塺墇墑墎塶墂墈塻墔墏壾奫嫜嫮嫥嫕嫪嫚嫭嫫嫳嫢嫠嫛嫬嫞嫝嫙嫨嫟孷寠"],
["e1a1","寣屣嶂嶀嵽嶆嵺嶁嵷嶊嶉嶈嵾嵼嶍嵹嵿幘幙幓廘廑廗廎廜廕廙廒廔彄彃彯徶愬愨慁慞慱慳慒慓慲慬憀慴慔慺慛慥愻慪慡慖戩戧戫搫摍摛摝摴摶摲摳摽摵摦撦摎撂摞摜摋摓摠摐摿搿摬摫摙摥摷敳斠暡暠暟朅朄朢榱榶槉"],
["e240","榠槎榖榰榬榼榑榙榎榧榍榩榾榯榿槄榽榤槔榹槊榚槏榳榓榪榡榞槙榗榐槂榵榥槆歊歍歋殞殟殠毃毄毾滎滵滱漃漥滸漷滻漮漉潎漙漚漧漘漻漒滭漊"],
["e2a1","漶潳滹滮漭潀漰漼漵滫漇漎潃漅滽滶漹漜滼漺漟漍漞漈漡熇熐熉熀熅熂熏煻熆熁熗牄牓犗犕犓獃獍獑獌瑢瑳瑱瑵瑲瑧瑮甀甂甃畽疐瘖瘈瘌瘕瘑瘊瘔皸瞁睼瞅瞂睮瞀睯睾瞃碲碪碴碭碨硾碫碞碥碠碬碢碤禘禊禋禖禕禔禓"],
["e340","禗禈禒禐稫穊稰稯稨稦窨窫窬竮箈箜箊箑箐箖箍箌箛箎箅箘劄箙箤箂粻粿粼粺綧綷緂綣綪緁緀緅綝緎緄緆緋緌綯綹綖綼綟綦綮綩綡緉罳翢翣翥翞"],
["e3a1","耤聝聜膉膆膃膇膍膌膋舕蒗蒤蒡蒟蒺蓎蓂蒬蒮蒫蒹蒴蓁蓍蒪蒚蒱蓐蒝蒧蒻蒢蒔蓇蓌蒛蒩蒯蒨蓖蒘蒶蓏蒠蓗蓔蓒蓛蒰蒑虡蜳蜣蜨蝫蝀蜮蜞蜡蜙蜛蝃蜬蝁蜾蝆蜠蜲蜪蜭蜼蜒蜺蜱蜵蝂蜦蜧蜸蜤蜚蜰蜑裷裧裱裲裺裾裮裼裶裻"],
["e440","裰裬裫覝覡覟覞觩觫觨誫誙誋誒誏誖谽豨豩賕賏賗趖踉踂跿踍跽踊踃踇踆踅跾踀踄輐輑輎輍鄣鄜鄠鄢鄟鄝鄚鄤鄡鄛酺酲酹酳銥銤鉶銛鉺銠銔銪銍"],
["e4a1","銦銚銫鉹銗鉿銣鋮銎銂銕銢鉽銈銡銊銆銌銙銧鉾銇銩銝銋鈭隞隡雿靘靽靺靾鞃鞀鞂靻鞄鞁靿韎韍頖颭颮餂餀餇馝馜駃馹馻馺駂馽駇骱髣髧鬾鬿魠魡魟鳱鳲鳵麧僿儃儰僸儆儇僶僾儋儌僽儊劋劌勱勯噈噂噌嘵噁噊噉噆噘"],
["e540","噚噀嘳嘽嘬嘾嘸嘪嘺圚墫墝墱墠墣墯墬墥墡壿嫿嫴嫽嫷嫶嬃嫸嬂嫹嬁嬇嬅嬏屧嶙嶗嶟嶒嶢嶓嶕嶠嶜嶡嶚嶞幩幝幠幜緳廛廞廡彉徲憋憃慹憱憰憢憉"],
["e5a1","憛憓憯憭憟憒憪憡憍慦憳戭摮摰撖撠撅撗撜撏撋撊撌撣撟摨撱撘敶敺敹敻斲斳暵暰暩暲暷暪暯樀樆樗槥槸樕槱槤樠槿槬槢樛樝槾樧槲槮樔槷槧橀樈槦槻樍槼槫樉樄樘樥樏槶樦樇槴樖歑殥殣殢殦氁氀毿氂潁漦潾澇濆澒"],
["e640","澍澉澌潢潏澅潚澖潶潬澂潕潲潒潐潗澔澓潝漀潡潫潽潧澐潓澋潩潿澕潣潷潪潻熲熯熛熰熠熚熩熵熝熥熞熤熡熪熜熧熳犘犚獘獒獞獟獠獝獛獡獚獙"],
["e6a1","獢璇璉璊璆璁瑽璅璈瑼瑹甈甇畾瘥瘞瘙瘝瘜瘣瘚瘨瘛皜皝皞皛瞍瞏瞉瞈磍碻磏磌磑磎磔磈磃磄磉禚禡禠禜禢禛歶稹窲窴窳箷篋箾箬篎箯箹篊箵糅糈糌糋緷緛緪緧緗緡縃緺緦緶緱緰緮緟罶羬羰羭翭翫翪翬翦翨聤聧膣膟"],
["e740","膞膕膢膙膗舖艏艓艒艐艎艑蔤蔻蔏蔀蔩蔎蔉蔍蔟蔊蔧蔜蓻蔫蓺蔈蔌蓴蔪蓲蔕蓷蓫蓳蓼蔒蓪蓩蔖蓾蔨蔝蔮蔂蓽蔞蓶蔱蔦蓧蓨蓰蓯蓹蔘蔠蔰蔋蔙蔯虢"],
["e7a1","蝖蝣蝤蝷蟡蝳蝘蝔蝛蝒蝡蝚蝑蝞蝭蝪蝐蝎蝟蝝蝯蝬蝺蝮蝜蝥蝏蝻蝵蝢蝧蝩衚褅褌褔褋褗褘褙褆褖褑褎褉覢覤覣觭觰觬諏諆誸諓諑諔諕誻諗誾諀諅諘諃誺誽諙谾豍貏賥賟賙賨賚賝賧趠趜趡趛踠踣踥踤踮踕踛踖踑踙踦踧"],
["e840","踔踒踘踓踜踗踚輬輤輘輚輠輣輖輗遳遰遯遧遫鄯鄫鄩鄪鄲鄦鄮醅醆醊醁醂醄醀鋐鋃鋄鋀鋙銶鋏鋱鋟鋘鋩鋗鋝鋌鋯鋂鋨鋊鋈鋎鋦鋍鋕鋉鋠鋞鋧鋑鋓"],
["e8a1","銵鋡鋆銴镼閬閫閮閰隤隢雓霅霈霂靚鞊鞎鞈韐韏頞頝頦頩頨頠頛頧颲餈飺餑餔餖餗餕駜駍駏駓駔駎駉駖駘駋駗駌骳髬髫髳髲髱魆魃魧魴魱魦魶魵魰魨魤魬鳼鳺鳽鳿鳷鴇鴀鳹鳻鴈鴅鴄麃黓鼏鼐儜儓儗儚儑凞匴叡噰噠噮"],
["e940","噳噦噣噭噲噞噷圜圛壈墽壉墿墺壂墼壆嬗嬙嬛嬡嬔嬓嬐嬖嬨嬚嬠嬞寯嶬嶱嶩嶧嶵嶰嶮嶪嶨嶲嶭嶯嶴幧幨幦幯廩廧廦廨廥彋徼憝憨憖懅憴懆懁懌憺"],
["e9a1","憿憸憌擗擖擐擏擉撽撉擃擛擳擙攳敿敼斢曈暾曀曊曋曏暽暻暺曌朣樴橦橉橧樲橨樾橝橭橶橛橑樨橚樻樿橁橪橤橐橏橔橯橩橠樼橞橖橕橍橎橆歕歔歖殧殪殫毈毇氄氃氆澭濋澣濇澼濎濈潞濄澽澞濊澨瀄澥澮澺澬澪濏澿澸"],
["ea40","澢濉澫濍澯澲澰燅燂熿熸燖燀燁燋燔燊燇燏熽燘熼燆燚燛犝犞獩獦獧獬獥獫獪瑿璚璠璔璒璕璡甋疀瘯瘭瘱瘽瘳瘼瘵瘲瘰皻盦瞚瞝瞡瞜瞛瞢瞣瞕瞙"],
["eaa1","瞗磝磩磥磪磞磣磛磡磢磭磟磠禤穄穈穇窶窸窵窱窷篞篣篧篝篕篥篚篨篹篔篪篢篜篫篘篟糒糔糗糐糑縒縡縗縌縟縠縓縎縜縕縚縢縋縏縖縍縔縥縤罃罻罼罺羱翯耪耩聬膱膦膮膹膵膫膰膬膴膲膷膧臲艕艖艗蕖蕅蕫蕍蕓蕡蕘"],
["eb40","蕀蕆蕤蕁蕢蕄蕑蕇蕣蔾蕛蕱蕎蕮蕵蕕蕧蕠薌蕦蕝蕔蕥蕬虣虥虤螛螏螗螓螒螈螁螖螘蝹螇螣螅螐螑螝螄螔螜螚螉褞褦褰褭褮褧褱褢褩褣褯褬褟觱諠"],
["eba1","諢諲諴諵諝謔諤諟諰諈諞諡諨諿諯諻貑貒貐賵賮賱賰賳赬赮趥趧踳踾踸蹀蹅踶踼踽蹁踰踿躽輶輮輵輲輹輷輴遶遹遻邆郺鄳鄵鄶醓醐醑醍醏錧錞錈錟錆錏鍺錸錼錛錣錒錁鍆錭錎錍鋋錝鋺錥錓鋹鋷錴錂錤鋿錩錹錵錪錔錌"],
["ec40","錋鋾錉錀鋻錖閼闍閾閹閺閶閿閵閽隩雔霋霒霐鞙鞗鞔韰韸頵頯頲餤餟餧餩馞駮駬駥駤駰駣駪駩駧骹骿骴骻髶髺髹髷鬳鮀鮅鮇魼魾魻鮂鮓鮒鮐魺鮕"],
["eca1","魽鮈鴥鴗鴠鴞鴔鴩鴝鴘鴢鴐鴙鴟麈麆麇麮麭黕黖黺鼒鼽儦儥儢儤儠儩勴嚓嚌嚍嚆嚄嚃噾嚂噿嚁壖壔壏壒嬭嬥嬲嬣嬬嬧嬦嬯嬮孻寱寲嶷幬幪徾徻懃憵憼懧懠懥懤懨懞擯擩擣擫擤擨斁斀斶旚曒檍檖檁檥檉檟檛檡檞檇檓檎"],
["ed40","檕檃檨檤檑橿檦檚檅檌檒歛殭氉濌澩濴濔濣濜濭濧濦濞濲濝濢濨燡燱燨燲燤燰燢獳獮獯璗璲璫璐璪璭璱璥璯甐甑甒甏疄癃癈癉癇皤盩瞵瞫瞲瞷瞶"],
["eda1","瞴瞱瞨矰磳磽礂磻磼磲礅磹磾礄禫禨穜穛穖穘穔穚窾竀竁簅簏篲簀篿篻簎篴簋篳簂簉簃簁篸篽簆篰篱簐簊糨縭縼繂縳顈縸縪繉繀繇縩繌縰縻縶繄縺罅罿罾罽翴翲耬膻臄臌臊臅臇膼臩艛艚艜薃薀薏薧薕薠薋薣蕻薤薚薞"],
["ee40","蕷蕼薉薡蕺蕸蕗薎薖薆薍薙薝薁薢薂薈薅蕹蕶薘薐薟虨螾螪螭蟅螰螬螹螵螼螮蟉蟃蟂蟌螷螯蟄蟊螴螶螿螸螽蟞螲褵褳褼褾襁襒褷襂覭覯覮觲觳謞"],
["eea1","謘謖謑謅謋謢謏謒謕謇謍謈謆謜謓謚豏豰豲豱豯貕貔賹赯蹎蹍蹓蹐蹌蹇轃轀邅遾鄸醚醢醛醙醟醡醝醠鎡鎃鎯鍤鍖鍇鍼鍘鍜鍶鍉鍐鍑鍠鍭鎏鍌鍪鍹鍗鍕鍒鍏鍱鍷鍻鍡鍞鍣鍧鎀鍎鍙闇闀闉闃闅閷隮隰隬霠霟霘霝霙鞚鞡鞜"],
["ef40","鞞鞝韕韔韱顁顄顊顉顅顃餥餫餬餪餳餲餯餭餱餰馘馣馡騂駺駴駷駹駸駶駻駽駾駼騃骾髾髽鬁髼魈鮚鮨鮞鮛鮦鮡鮥鮤鮆鮢鮠鮯鴳鵁鵧鴶鴮鴯鴱鴸鴰"],
["efa1","鵅鵂鵃鴾鴷鵀鴽翵鴭麊麉麍麰黈黚黻黿鼤鼣鼢齔龠儱儭儮嚘嚜嚗嚚嚝嚙奰嬼屩屪巀幭幮懘懟懭懮懱懪懰懫懖懩擿攄擽擸攁攃擼斔旛曚曛曘櫅檹檽櫡櫆檺檶檷櫇檴檭歞毉氋瀇瀌瀍瀁瀅瀔瀎濿瀀濻瀦濼濷瀊爁燿燹爃燽獶"],
["f040","璸瓀璵瓁璾璶璻瓂甔甓癜癤癙癐癓癗癚皦皽盬矂瞺磿礌礓礔礉礐礒礑禭禬穟簜簩簙簠簟簭簝簦簨簢簥簰繜繐繖繣繘繢繟繑繠繗繓羵羳翷翸聵臑臒"],
["f0a1","臐艟艞薴藆藀藃藂薳薵薽藇藄薿藋藎藈藅薱薶藒蘤薸薷薾虩蟧蟦蟢蟛蟫蟪蟥蟟蟳蟤蟔蟜蟓蟭蟘蟣螤蟗蟙蠁蟴蟨蟝襓襋襏襌襆襐襑襉謪謧謣謳謰謵譇謯謼謾謱謥謷謦謶謮謤謻謽謺豂豵貙貘貗賾贄贂贀蹜蹢蹠蹗蹖蹞蹥蹧"],
["f140","蹛蹚蹡蹝蹩蹔轆轇轈轋鄨鄺鄻鄾醨醥醧醯醪鎵鎌鎒鎷鎛鎝鎉鎧鎎鎪鎞鎦鎕鎈鎙鎟鎍鎱鎑鎲鎤鎨鎴鎣鎥闒闓闑隳雗雚巂雟雘雝霣霢霥鞬鞮鞨鞫鞤鞪"],
["f1a1","鞢鞥韗韙韖韘韺顐顑顒颸饁餼餺騏騋騉騍騄騑騊騅騇騆髀髜鬈鬄鬅鬩鬵魊魌魋鯇鯆鯃鮿鯁鮵鮸鯓鮶鯄鮹鮽鵜鵓鵏鵊鵛鵋鵙鵖鵌鵗鵒鵔鵟鵘鵚麎麌黟鼁鼀鼖鼥鼫鼪鼩鼨齌齕儴儵劖勷厴嚫嚭嚦嚧嚪嚬壚壝壛夒嬽嬾嬿巃幰"],
["f240","徿懻攇攐攍攉攌攎斄旞旝曞櫧櫠櫌櫑櫙櫋櫟櫜櫐櫫櫏櫍櫞歠殰氌瀙瀧瀠瀖瀫瀡瀢瀣瀩瀗瀤瀜瀪爌爊爇爂爅犥犦犤犣犡瓋瓅璷瓃甖癠矉矊矄矱礝礛"],
["f2a1","礡礜礗礞禰穧穨簳簼簹簬簻糬糪繶繵繸繰繷繯繺繲繴繨罋罊羃羆羷翽翾聸臗臕艤艡艣藫藱藭藙藡藨藚藗藬藲藸藘藟藣藜藑藰藦藯藞藢蠀蟺蠃蟶蟷蠉蠌蠋蠆蟼蠈蟿蠊蠂襢襚襛襗襡襜襘襝襙覈覷覶觶譐譈譊譀譓譖譔譋譕"],
["f340","譑譂譒譗豃豷豶貚贆贇贉趬趪趭趫蹭蹸蹳蹪蹯蹻軂轒轑轏轐轓辴酀鄿醰醭鏞鏇鏏鏂鏚鏐鏹鏬鏌鏙鎩鏦鏊鏔鏮鏣鏕鏄鏎鏀鏒鏧镽闚闛雡霩霫霬霨霦"],
["f3a1","鞳鞷鞶韝韞韟顜顙顝顗颿颽颻颾饈饇饃馦馧騚騕騥騝騤騛騢騠騧騣騞騜騔髂鬋鬊鬎鬌鬷鯪鯫鯠鯞鯤鯦鯢鯰鯔鯗鯬鯜鯙鯥鯕鯡鯚鵷鶁鶊鶄鶈鵱鶀鵸鶆鶋鶌鵽鵫鵴鵵鵰鵩鶅鵳鵻鶂鵯鵹鵿鶇鵨麔麑黀黼鼭齀齁齍齖齗齘匷嚲"],
["f440","嚵嚳壣孅巆巇廮廯忀忁懹攗攖攕攓旟曨曣曤櫳櫰櫪櫨櫹櫱櫮櫯瀼瀵瀯瀷瀴瀱灂瀸瀿瀺瀹灀瀻瀳灁爓爔犨獽獼璺皫皪皾盭矌矎矏矍矲礥礣礧礨礤礩"],
["f4a1","禲穮穬穭竷籉籈籊籇籅糮繻繾纁纀羺翿聹臛臙舋艨艩蘢藿蘁藾蘛蘀藶蘄蘉蘅蘌藽蠙蠐蠑蠗蠓蠖襣襦覹觷譠譪譝譨譣譥譧譭趮躆躈躄轙轖轗轕轘轚邍酃酁醷醵醲醳鐋鐓鏻鐠鐏鐔鏾鐕鐐鐨鐙鐍鏵鐀鏷鐇鐎鐖鐒鏺鐉鏸鐊鏿"],
["f540","鏼鐌鏶鐑鐆闞闠闟霮霯鞹鞻韽韾顠顢顣顟飁飂饐饎饙饌饋饓騲騴騱騬騪騶騩騮騸騭髇髊髆鬐鬒鬑鰋鰈鯷鰅鰒鯸鱀鰇鰎鰆鰗鰔鰉鶟鶙鶤鶝鶒鶘鶐鶛"],
["f5a1","鶠鶔鶜鶪鶗鶡鶚鶢鶨鶞鶣鶿鶩鶖鶦鶧麙麛麚黥黤黧黦鼰鼮齛齠齞齝齙龑儺儹劘劗囃嚽嚾孈孇巋巏廱懽攛欂櫼欃櫸欀灃灄灊灈灉灅灆爝爚爙獾甗癪矐礭礱礯籔籓糲纊纇纈纋纆纍罍羻耰臝蘘蘪蘦蘟蘣蘜蘙蘧蘮蘡蘠蘩蘞蘥"],
["f640","蠩蠝蠛蠠蠤蠜蠫衊襭襩襮襫觺譹譸譅譺譻贐贔趯躎躌轞轛轝酆酄酅醹鐿鐻鐶鐩鐽鐼鐰鐹鐪鐷鐬鑀鐱闥闤闣霵霺鞿韡顤飉飆飀饘饖騹騽驆驄驂驁騺"],
["f6a1","騿髍鬕鬗鬘鬖鬺魒鰫鰝鰜鰬鰣鰨鰩鰤鰡鶷鶶鶼鷁鷇鷊鷏鶾鷅鷃鶻鶵鷎鶹鶺鶬鷈鶱鶭鷌鶳鷍鶲鹺麜黫黮黭鼛鼘鼚鼱齎齥齤龒亹囆囅囋奱孋孌巕巑廲攡攠攦攢欋欈欉氍灕灖灗灒爞爟犩獿瓘瓕瓙瓗癭皭礵禴穰穱籗籜籙籛籚"],
["f740","糴糱纑罏羇臞艫蘴蘵蘳蘬蘲蘶蠬蠨蠦蠪蠥襱覿覾觻譾讄讂讆讅譿贕躕躔躚躒躐躖躗轠轢酇鑌鑐鑊鑋鑏鑇鑅鑈鑉鑆霿韣顪顩飋饔饛驎驓驔驌驏驈驊"],
["f7a1","驉驒驐髐鬙鬫鬻魖魕鱆鱈鰿鱄鰹鰳鱁鰼鰷鰴鰲鰽鰶鷛鷒鷞鷚鷋鷐鷜鷑鷟鷩鷙鷘鷖鷵鷕鷝麶黰鼵鼳鼲齂齫龕龢儽劙壨壧奲孍巘蠯彏戁戃戄攩攥斖曫欑欒欏毊灛灚爢玂玁玃癰矔籧籦纕艬蘺虀蘹蘼蘱蘻蘾蠰蠲蠮蠳襶襴襳觾"],
["f840","讌讎讋讈豅贙躘轤轣醼鑢鑕鑝鑗鑞韄韅頀驖驙鬞鬟鬠鱒鱘鱐鱊鱍鱋鱕鱙鱌鱎鷻鷷鷯鷣鷫鷸鷤鷶鷡鷮鷦鷲鷰鷢鷬鷴鷳鷨鷭黂黐黲黳鼆鼜鼸鼷鼶齃齏"],
["f8a1","齱齰齮齯囓囍孎屭攭曭曮欓灟灡灝灠爣瓛瓥矕礸禷禶籪纗羉艭虃蠸蠷蠵衋讔讕躞躟躠躝醾醽釂鑫鑨鑩雥靆靃靇韇韥驞髕魙鱣鱧鱦鱢鱞鱠鸂鷾鸇鸃鸆鸅鸀鸁鸉鷿鷽鸄麠鼞齆齴齵齶囔攮斸欘欙欗欚灢爦犪矘矙礹籩籫糶纚"],
["f940","纘纛纙臠臡虆虇虈襹襺襼襻觿讘讙躥躤躣鑮鑭鑯鑱鑳靉顲饟鱨鱮鱭鸋鸍鸐鸏鸒鸑麡黵鼉齇齸齻齺齹圞灦籯蠼趲躦釃鑴鑸鑶鑵驠鱴鱳鱱鱵鸔鸓黶鼊"],
["f9a1","龤灨灥糷虪蠾蠽蠿讞貜躩軉靋顳顴飌饡馫驤驦驧鬤鸕鸗齈戇欞爧虌躨钂钀钁驩驨鬮鸙爩虋讟钃鱹麷癵驫鱺鸝灩灪麤齾齉龘碁銹裏墻恒粧嫺╔╦╗╠╬╣╚╩╝╒╤╕╞╪╡╘╧╛╓╥╖╟╫╢╙╨╜║═╭╮╰╯▓"]
]

},{}],21:[function(require,module,exports){
module.exports=[
["0","\u0000",127],
["8ea1","｡",62],
["a1a1","　、。，．・：；？！゛゜´｀¨＾￣＿ヽヾゝゞ〃仝々〆〇ー―‐／＼～∥｜…‥‘’“”（）〔〕［］｛｝〈",9,"＋－±×÷＝≠＜＞≦≧∞∴♂♀°′″℃￥＄￠￡％＃＆＊＠§☆★○●◎◇"],
["a2a1","◆□■△▲▽▼※〒→←↑↓〓"],
["a2ba","∈∋⊆⊇⊂⊃∪∩"],
["a2ca","∧∨￢⇒⇔∀∃"],
["a2dc","∠⊥⌒∂∇≡≒≪≫√∽∝∵∫∬"],
["a2f2","ʼn♯♭♪†‡¶"],
["a2fe","◯"],
["a3b0","０",9],
["a3c1","Ａ",25],
["a3e1","ａ",25],
["a4a1","ぁ",82],
["a5a1","ァ",85],
["a6a1","Α",16,"Σ",6],
["a6c1","α",16,"σ",6],
["a7a1","А",5,"ЁЖ",25],
["a7d1","а",5,"ёж",25],
["a8a1","─│┌┐┘└├┬┤┴┼━┃┏┓┛┗┣┳┫┻╋┠┯┨┷┿┝┰┥┸╂"],
["ada1","①",19,"Ⅰ",9],
["adc0","㍉㌔㌢㍍㌘㌧㌃㌶㍑㍗㌍㌦㌣㌫㍊㌻㎜㎝㎞㎎㎏㏄㎡"],
["addf","㍻〝〟№㏍℡㊤",4,"㈱㈲㈹㍾㍽㍼≒≡∫∮∑√⊥∠∟⊿∵∩∪"],
["b0a1","亜唖娃阿哀愛挨姶逢葵茜穐悪握渥旭葦芦鯵梓圧斡扱宛姐虻飴絢綾鮎或粟袷安庵按暗案闇鞍杏以伊位依偉囲夷委威尉惟意慰易椅為畏異移維緯胃萎衣謂違遺医井亥域育郁磯一壱溢逸稲茨芋鰯允印咽員因姻引飲淫胤蔭"],
["b1a1","院陰隠韻吋右宇烏羽迂雨卯鵜窺丑碓臼渦嘘唄欝蔚鰻姥厩浦瓜閏噂云運雲荏餌叡営嬰影映曳栄永泳洩瑛盈穎頴英衛詠鋭液疫益駅悦謁越閲榎厭円園堰奄宴延怨掩援沿演炎焔煙燕猿縁艶苑薗遠鉛鴛塩於汚甥凹央奥往応"],
["b2a1","押旺横欧殴王翁襖鴬鴎黄岡沖荻億屋憶臆桶牡乙俺卸恩温穏音下化仮何伽価佳加可嘉夏嫁家寡科暇果架歌河火珂禍禾稼箇花苛茄荷華菓蝦課嘩貨迦過霞蚊俄峨我牙画臥芽蛾賀雅餓駕介会解回塊壊廻快怪悔恢懐戒拐改"],
["b3a1","魁晦械海灰界皆絵芥蟹開階貝凱劾外咳害崖慨概涯碍蓋街該鎧骸浬馨蛙垣柿蛎鈎劃嚇各廓拡撹格核殻獲確穫覚角赫較郭閣隔革学岳楽額顎掛笠樫橿梶鰍潟割喝恰括活渇滑葛褐轄且鰹叶椛樺鞄株兜竃蒲釜鎌噛鴨栢茅萱"],
["b4a1","粥刈苅瓦乾侃冠寒刊勘勧巻喚堪姦完官寛干幹患感慣憾換敢柑桓棺款歓汗漢澗潅環甘監看竿管簡緩缶翰肝艦莞観諌貫還鑑間閑関陥韓館舘丸含岸巌玩癌眼岩翫贋雁頑顔願企伎危喜器基奇嬉寄岐希幾忌揮机旗既期棋棄"],
["b5a1","機帰毅気汽畿祈季稀紀徽規記貴起軌輝飢騎鬼亀偽儀妓宜戯技擬欺犠疑祇義蟻誼議掬菊鞠吉吃喫桔橘詰砧杵黍却客脚虐逆丘久仇休及吸宮弓急救朽求汲泣灸球究窮笈級糾給旧牛去居巨拒拠挙渠虚許距鋸漁禦魚亨享京"],
["b6a1","供侠僑兇競共凶協匡卿叫喬境峡強彊怯恐恭挟教橋況狂狭矯胸脅興蕎郷鏡響饗驚仰凝尭暁業局曲極玉桐粁僅勤均巾錦斤欣欽琴禁禽筋緊芹菌衿襟謹近金吟銀九倶句区狗玖矩苦躯駆駈駒具愚虞喰空偶寓遇隅串櫛釧屑屈"],
["b7a1","掘窟沓靴轡窪熊隈粂栗繰桑鍬勲君薫訓群軍郡卦袈祁係傾刑兄啓圭珪型契形径恵慶慧憩掲携敬景桂渓畦稽系経継繋罫茎荊蛍計詣警軽頚鶏芸迎鯨劇戟撃激隙桁傑欠決潔穴結血訣月件倹倦健兼券剣喧圏堅嫌建憲懸拳捲"],
["b8a1","検権牽犬献研硯絹県肩見謙賢軒遣鍵険顕験鹸元原厳幻弦減源玄現絃舷言諺限乎個古呼固姑孤己庫弧戸故枯湖狐糊袴股胡菰虎誇跨鈷雇顧鼓五互伍午呉吾娯後御悟梧檎瑚碁語誤護醐乞鯉交佼侯候倖光公功効勾厚口向"],
["b9a1","后喉坑垢好孔孝宏工巧巷幸広庚康弘恒慌抗拘控攻昂晃更杭校梗構江洪浩港溝甲皇硬稿糠紅紘絞綱耕考肯肱腔膏航荒行衡講貢購郊酵鉱砿鋼閤降項香高鴻剛劫号合壕拷濠豪轟麹克刻告国穀酷鵠黒獄漉腰甑忽惚骨狛込"],
["baa1","此頃今困坤墾婚恨懇昏昆根梱混痕紺艮魂些佐叉唆嵯左差査沙瑳砂詐鎖裟坐座挫債催再最哉塞妻宰彩才採栽歳済災采犀砕砦祭斎細菜裁載際剤在材罪財冴坂阪堺榊肴咲崎埼碕鷺作削咋搾昨朔柵窄策索錯桜鮭笹匙冊刷"],
["bba1","察拶撮擦札殺薩雑皐鯖捌錆鮫皿晒三傘参山惨撒散桟燦珊産算纂蚕讃賛酸餐斬暫残仕仔伺使刺司史嗣四士始姉姿子屍市師志思指支孜斯施旨枝止死氏獅祉私糸紙紫肢脂至視詞詩試誌諮資賜雌飼歯事似侍児字寺慈持時"],
["bca1","次滋治爾璽痔磁示而耳自蒔辞汐鹿式識鴫竺軸宍雫七叱執失嫉室悉湿漆疾質実蔀篠偲柴芝屡蕊縞舎写射捨赦斜煮社紗者謝車遮蛇邪借勺尺杓灼爵酌釈錫若寂弱惹主取守手朱殊狩珠種腫趣酒首儒受呪寿授樹綬需囚収周"],
["bda1","宗就州修愁拾洲秀秋終繍習臭舟蒐衆襲讐蹴輯週酋酬集醜什住充十従戎柔汁渋獣縦重銃叔夙宿淑祝縮粛塾熟出術述俊峻春瞬竣舜駿准循旬楯殉淳準潤盾純巡遵醇順処初所暑曙渚庶緒署書薯藷諸助叙女序徐恕鋤除傷償"],
["bea1","勝匠升召哨商唱嘗奨妾娼宵将小少尚庄床廠彰承抄招掌捷昇昌昭晶松梢樟樵沼消渉湘焼焦照症省硝礁祥称章笑粧紹肖菖蒋蕉衝裳訟証詔詳象賞醤鉦鍾鐘障鞘上丈丞乗冗剰城場壌嬢常情擾条杖浄状畳穣蒸譲醸錠嘱埴飾"],
["bfa1","拭植殖燭織職色触食蝕辱尻伸信侵唇娠寝審心慎振新晋森榛浸深申疹真神秦紳臣芯薪親診身辛進針震人仁刃塵壬尋甚尽腎訊迅陣靭笥諏須酢図厨逗吹垂帥推水炊睡粋翠衰遂酔錐錘随瑞髄崇嵩数枢趨雛据杉椙菅頗雀裾"],
["c0a1","澄摺寸世瀬畝是凄制勢姓征性成政整星晴棲栖正清牲生盛精聖声製西誠誓請逝醒青静斉税脆隻席惜戚斥昔析石積籍績脊責赤跡蹟碩切拙接摂折設窃節説雪絶舌蝉仙先千占宣専尖川戦扇撰栓栴泉浅洗染潜煎煽旋穿箭線"],
["c1a1","繊羨腺舛船薦詮賎践選遷銭銑閃鮮前善漸然全禅繕膳糎噌塑岨措曾曽楚狙疏疎礎祖租粗素組蘇訴阻遡鼠僧創双叢倉喪壮奏爽宋層匝惣想捜掃挿掻操早曹巣槍槽漕燥争痩相窓糟総綜聡草荘葬蒼藻装走送遭鎗霜騒像増憎"],
["c2a1","臓蔵贈造促側則即息捉束測足速俗属賊族続卒袖其揃存孫尊損村遜他多太汰詑唾堕妥惰打柁舵楕陀駄騨体堆対耐岱帯待怠態戴替泰滞胎腿苔袋貸退逮隊黛鯛代台大第醍題鷹滝瀧卓啄宅托択拓沢濯琢託鐸濁諾茸凧蛸只"],
["c3a1","叩但達辰奪脱巽竪辿棚谷狸鱈樽誰丹単嘆坦担探旦歎淡湛炭短端箪綻耽胆蛋誕鍛団壇弾断暖檀段男談値知地弛恥智池痴稚置致蜘遅馳築畜竹筑蓄逐秩窒茶嫡着中仲宙忠抽昼柱注虫衷註酎鋳駐樗瀦猪苧著貯丁兆凋喋寵"],
["c4a1","帖帳庁弔張彫徴懲挑暢朝潮牒町眺聴脹腸蝶調諜超跳銚長頂鳥勅捗直朕沈珍賃鎮陳津墜椎槌追鎚痛通塚栂掴槻佃漬柘辻蔦綴鍔椿潰坪壷嬬紬爪吊釣鶴亭低停偵剃貞呈堤定帝底庭廷弟悌抵挺提梯汀碇禎程締艇訂諦蹄逓"],
["c5a1","邸鄭釘鼎泥摘擢敵滴的笛適鏑溺哲徹撤轍迭鉄典填天展店添纏甜貼転顛点伝殿澱田電兎吐堵塗妬屠徒斗杜渡登菟賭途都鍍砥砺努度土奴怒倒党冬凍刀唐塔塘套宕島嶋悼投搭東桃梼棟盗淘湯涛灯燈当痘祷等答筒糖統到"],
["c6a1","董蕩藤討謄豆踏逃透鐙陶頭騰闘働動同堂導憧撞洞瞳童胴萄道銅峠鴇匿得徳涜特督禿篤毒独読栃橡凸突椴届鳶苫寅酉瀞噸屯惇敦沌豚遁頓呑曇鈍奈那内乍凪薙謎灘捺鍋楢馴縄畷南楠軟難汝二尼弐迩匂賑肉虹廿日乳入"],
["c7a1","如尿韮任妊忍認濡禰祢寧葱猫熱年念捻撚燃粘乃廼之埜嚢悩濃納能脳膿農覗蚤巴把播覇杷波派琶破婆罵芭馬俳廃拝排敗杯盃牌背肺輩配倍培媒梅楳煤狽買売賠陪這蝿秤矧萩伯剥博拍柏泊白箔粕舶薄迫曝漠爆縛莫駁麦"],
["c8a1","函箱硲箸肇筈櫨幡肌畑畠八鉢溌発醗髪伐罰抜筏閥鳩噺塙蛤隼伴判半反叛帆搬斑板氾汎版犯班畔繁般藩販範釆煩頒飯挽晩番盤磐蕃蛮匪卑否妃庇彼悲扉批披斐比泌疲皮碑秘緋罷肥被誹費避非飛樋簸備尾微枇毘琵眉美"],
["c9a1","鼻柊稗匹疋髭彦膝菱肘弼必畢筆逼桧姫媛紐百謬俵彪標氷漂瓢票表評豹廟描病秒苗錨鋲蒜蛭鰭品彬斌浜瀕貧賓頻敏瓶不付埠夫婦富冨布府怖扶敷斧普浮父符腐膚芙譜負賦赴阜附侮撫武舞葡蕪部封楓風葺蕗伏副復幅服"],
["caa1","福腹複覆淵弗払沸仏物鮒分吻噴墳憤扮焚奮粉糞紛雰文聞丙併兵塀幣平弊柄並蔽閉陛米頁僻壁癖碧別瞥蔑箆偏変片篇編辺返遍便勉娩弁鞭保舗鋪圃捕歩甫補輔穂募墓慕戊暮母簿菩倣俸包呆報奉宝峰峯崩庖抱捧放方朋"],
["cba1","法泡烹砲縫胞芳萌蓬蜂褒訪豊邦鋒飽鳳鵬乏亡傍剖坊妨帽忘忙房暴望某棒冒紡肪膨謀貌貿鉾防吠頬北僕卜墨撲朴牧睦穆釦勃没殆堀幌奔本翻凡盆摩磨魔麻埋妹昧枚毎哩槙幕膜枕鮪柾鱒桝亦俣又抹末沫迄侭繭麿万慢満"],
["cca1","漫蔓味未魅巳箕岬密蜜湊蓑稔脈妙粍民眠務夢無牟矛霧鵡椋婿娘冥名命明盟迷銘鳴姪牝滅免棉綿緬面麺摸模茂妄孟毛猛盲網耗蒙儲木黙目杢勿餅尤戻籾貰問悶紋門匁也冶夜爺耶野弥矢厄役約薬訳躍靖柳薮鑓愉愈油癒"],
["cda1","諭輸唯佑優勇友宥幽悠憂揖有柚湧涌猶猷由祐裕誘遊邑郵雄融夕予余与誉輿預傭幼妖容庸揚揺擁曜楊様洋溶熔用窯羊耀葉蓉要謡踊遥陽養慾抑欲沃浴翌翼淀羅螺裸来莱頼雷洛絡落酪乱卵嵐欄濫藍蘭覧利吏履李梨理璃"],
["cea1","痢裏裡里離陸律率立葎掠略劉流溜琉留硫粒隆竜龍侶慮旅虜了亮僚両凌寮料梁涼猟療瞭稜糧良諒遼量陵領力緑倫厘林淋燐琳臨輪隣鱗麟瑠塁涙累類令伶例冷励嶺怜玲礼苓鈴隷零霊麗齢暦歴列劣烈裂廉恋憐漣煉簾練聯"],
["cfa1","蓮連錬呂魯櫓炉賂路露労婁廊弄朗楼榔浪漏牢狼篭老聾蝋郎六麓禄肋録論倭和話歪賄脇惑枠鷲亙亘鰐詫藁蕨椀湾碗腕"],
["d0a1","弌丐丕个丱丶丼丿乂乖乘亂亅豫亊舒弍于亞亟亠亢亰亳亶从仍仄仆仂仗仞仭仟价伉佚估佛佝佗佇佶侈侏侘佻佩佰侑佯來侖儘俔俟俎俘俛俑俚俐俤俥倚倨倔倪倥倅伜俶倡倩倬俾俯們倆偃假會偕偐偈做偖偬偸傀傚傅傴傲"],
["d1a1","僉僊傳僂僖僞僥僭僣僮價僵儉儁儂儖儕儔儚儡儺儷儼儻儿兀兒兌兔兢竸兩兪兮冀冂囘册冉冏冑冓冕冖冤冦冢冩冪冫决冱冲冰况冽凅凉凛几處凩凭凰凵凾刄刋刔刎刧刪刮刳刹剏剄剋剌剞剔剪剴剩剳剿剽劍劔劒剱劈劑辨"],
["d2a1","辧劬劭劼劵勁勍勗勞勣勦飭勠勳勵勸勹匆匈甸匍匐匏匕匚匣匯匱匳匸區卆卅丗卉卍凖卞卩卮夘卻卷厂厖厠厦厥厮厰厶參簒雙叟曼燮叮叨叭叺吁吽呀听吭吼吮吶吩吝呎咏呵咎呟呱呷呰咒呻咀呶咄咐咆哇咢咸咥咬哄哈咨"],
["d3a1","咫哂咤咾咼哘哥哦唏唔哽哮哭哺哢唹啀啣啌售啜啅啖啗唸唳啝喙喀咯喊喟啻啾喘喞單啼喃喩喇喨嗚嗅嗟嗄嗜嗤嗔嘔嗷嘖嗾嗽嘛嗹噎噐營嘴嘶嘲嘸噫噤嘯噬噪嚆嚀嚊嚠嚔嚏嚥嚮嚶嚴囂嚼囁囃囀囈囎囑囓囗囮囹圀囿圄圉"],
["d4a1","圈國圍圓團圖嗇圜圦圷圸坎圻址坏坩埀垈坡坿垉垓垠垳垤垪垰埃埆埔埒埓堊埖埣堋堙堝塲堡塢塋塰毀塒堽塹墅墹墟墫墺壞墻墸墮壅壓壑壗壙壘壥壜壤壟壯壺壹壻壼壽夂夊夐夛梦夥夬夭夲夸夾竒奕奐奎奚奘奢奠奧奬奩"],
["d5a1","奸妁妝佞侫妣妲姆姨姜妍姙姚娥娟娑娜娉娚婀婬婉娵娶婢婪媚媼媾嫋嫂媽嫣嫗嫦嫩嫖嫺嫻嬌嬋嬖嬲嫐嬪嬶嬾孃孅孀孑孕孚孛孥孩孰孳孵學斈孺宀它宦宸寃寇寉寔寐寤實寢寞寥寫寰寶寳尅將專對尓尠尢尨尸尹屁屆屎屓"],
["d6a1","屐屏孱屬屮乢屶屹岌岑岔妛岫岻岶岼岷峅岾峇峙峩峽峺峭嶌峪崋崕崗嵜崟崛崑崔崢崚崙崘嵌嵒嵎嵋嵬嵳嵶嶇嶄嶂嶢嶝嶬嶮嶽嶐嶷嶼巉巍巓巒巖巛巫已巵帋帚帙帑帛帶帷幄幃幀幎幗幔幟幢幤幇幵并幺麼广庠廁廂廈廐廏"],
["d7a1","廖廣廝廚廛廢廡廨廩廬廱廳廰廴廸廾弃弉彝彜弋弑弖弩弭弸彁彈彌彎弯彑彖彗彙彡彭彳彷徃徂彿徊很徑徇從徙徘徠徨徭徼忖忻忤忸忱忝悳忿怡恠怙怐怩怎怱怛怕怫怦怏怺恚恁恪恷恟恊恆恍恣恃恤恂恬恫恙悁悍惧悃悚"],
["d8a1","悄悛悖悗悒悧悋惡悸惠惓悴忰悽惆悵惘慍愕愆惶惷愀惴惺愃愡惻惱愍愎慇愾愨愧慊愿愼愬愴愽慂慄慳慷慘慙慚慫慴慯慥慱慟慝慓慵憙憖憇憬憔憚憊憑憫憮懌懊應懷懈懃懆憺懋罹懍懦懣懶懺懴懿懽懼懾戀戈戉戍戌戔戛"],
["d9a1","戞戡截戮戰戲戳扁扎扞扣扛扠扨扼抂抉找抒抓抖拔抃抔拗拑抻拏拿拆擔拈拜拌拊拂拇抛拉挌拮拱挧挂挈拯拵捐挾捍搜捏掖掎掀掫捶掣掏掉掟掵捫捩掾揩揀揆揣揉插揶揄搖搴搆搓搦搶攝搗搨搏摧摯摶摎攪撕撓撥撩撈撼"],
["daa1","據擒擅擇撻擘擂擱擧舉擠擡抬擣擯攬擶擴擲擺攀擽攘攜攅攤攣攫攴攵攷收攸畋效敖敕敍敘敞敝敲數斂斃變斛斟斫斷旃旆旁旄旌旒旛旙无旡旱杲昊昃旻杳昵昶昴昜晏晄晉晁晞晝晤晧晨晟晢晰暃暈暎暉暄暘暝曁暹曉暾暼"],
["dba1","曄暸曖曚曠昿曦曩曰曵曷朏朖朞朦朧霸朮朿朶杁朸朷杆杞杠杙杣杤枉杰枩杼杪枌枋枦枡枅枷柯枴柬枳柩枸柤柞柝柢柮枹柎柆柧檜栞框栩桀桍栲桎梳栫桙档桷桿梟梏梭梔條梛梃檮梹桴梵梠梺椏梍桾椁棊椈棘椢椦棡椌棍"],
["dca1","棔棧棕椶椒椄棗棣椥棹棠棯椨椪椚椣椡棆楹楷楜楸楫楔楾楮椹楴椽楙椰楡楞楝榁楪榲榮槐榿槁槓榾槎寨槊槝榻槃榧樮榑榠榜榕榴槞槨樂樛槿權槹槲槧樅榱樞槭樔槫樊樒櫁樣樓橄樌橲樶橸橇橢橙橦橈樸樢檐檍檠檄檢檣"],
["dda1","檗蘗檻櫃櫂檸檳檬櫞櫑櫟檪櫚櫪櫻欅蘖櫺欒欖鬱欟欸欷盜欹飮歇歃歉歐歙歔歛歟歡歸歹歿殀殄殃殍殘殕殞殤殪殫殯殲殱殳殷殼毆毋毓毟毬毫毳毯麾氈氓气氛氤氣汞汕汢汪沂沍沚沁沛汾汨汳沒沐泄泱泓沽泗泅泝沮沱沾"],
["dea1","沺泛泯泙泪洟衍洶洫洽洸洙洵洳洒洌浣涓浤浚浹浙涎涕濤涅淹渕渊涵淇淦涸淆淬淞淌淨淒淅淺淙淤淕淪淮渭湮渮渙湲湟渾渣湫渫湶湍渟湃渺湎渤滿渝游溂溪溘滉溷滓溽溯滄溲滔滕溏溥滂溟潁漑灌滬滸滾漿滲漱滯漲滌"],
["dfa1","漾漓滷澆潺潸澁澀潯潛濳潭澂潼潘澎澑濂潦澳澣澡澤澹濆澪濟濕濬濔濘濱濮濛瀉瀋濺瀑瀁瀏濾瀛瀚潴瀝瀘瀟瀰瀾瀲灑灣炙炒炯烱炬炸炳炮烟烋烝烙焉烽焜焙煥煕熈煦煢煌煖煬熏燻熄熕熨熬燗熹熾燒燉燔燎燠燬燧燵燼"],
["e0a1","燹燿爍爐爛爨爭爬爰爲爻爼爿牀牆牋牘牴牾犂犁犇犒犖犢犧犹犲狃狆狄狎狒狢狠狡狹狷倏猗猊猜猖猝猴猯猩猥猾獎獏默獗獪獨獰獸獵獻獺珈玳珎玻珀珥珮珞璢琅瑯琥珸琲琺瑕琿瑟瑙瑁瑜瑩瑰瑣瑪瑶瑾璋璞璧瓊瓏瓔珱"],
["e1a1","瓠瓣瓧瓩瓮瓲瓰瓱瓸瓷甄甃甅甌甎甍甕甓甞甦甬甼畄畍畊畉畛畆畚畩畤畧畫畭畸當疆疇畴疊疉疂疔疚疝疥疣痂疳痃疵疽疸疼疱痍痊痒痙痣痞痾痿痼瘁痰痺痲痳瘋瘍瘉瘟瘧瘠瘡瘢瘤瘴瘰瘻癇癈癆癜癘癡癢癨癩癪癧癬癰"],
["e2a1","癲癶癸發皀皃皈皋皎皖皓皙皚皰皴皸皹皺盂盍盖盒盞盡盥盧盪蘯盻眈眇眄眩眤眞眥眦眛眷眸睇睚睨睫睛睥睿睾睹瞎瞋瞑瞠瞞瞰瞶瞹瞿瞼瞽瞻矇矍矗矚矜矣矮矼砌砒礦砠礪硅碎硴碆硼碚碌碣碵碪碯磑磆磋磔碾碼磅磊磬"],
["e3a1","磧磚磽磴礇礒礑礙礬礫祀祠祗祟祚祕祓祺祿禊禝禧齋禪禮禳禹禺秉秕秧秬秡秣稈稍稘稙稠稟禀稱稻稾稷穃穗穉穡穢穩龝穰穹穽窈窗窕窘窖窩竈窰窶竅竄窿邃竇竊竍竏竕竓站竚竝竡竢竦竭竰笂笏笊笆笳笘笙笞笵笨笶筐"],
["e4a1","筺笄筍笋筌筅筵筥筴筧筰筱筬筮箝箘箟箍箜箚箋箒箏筝箙篋篁篌篏箴篆篝篩簑簔篦篥籠簀簇簓篳篷簗簍篶簣簧簪簟簷簫簽籌籃籔籏籀籐籘籟籤籖籥籬籵粃粐粤粭粢粫粡粨粳粲粱粮粹粽糀糅糂糘糒糜糢鬻糯糲糴糶糺紆"],
["e5a1","紂紜紕紊絅絋紮紲紿紵絆絳絖絎絲絨絮絏絣經綉絛綏絽綛綺綮綣綵緇綽綫總綢綯緜綸綟綰緘緝緤緞緻緲緡縅縊縣縡縒縱縟縉縋縢繆繦縻縵縹繃縷縲縺繧繝繖繞繙繚繹繪繩繼繻纃緕繽辮繿纈纉續纒纐纓纔纖纎纛纜缸缺"],
["e6a1","罅罌罍罎罐网罕罔罘罟罠罨罩罧罸羂羆羃羈羇羌羔羞羝羚羣羯羲羹羮羶羸譱翅翆翊翕翔翡翦翩翳翹飜耆耄耋耒耘耙耜耡耨耿耻聊聆聒聘聚聟聢聨聳聲聰聶聹聽聿肄肆肅肛肓肚肭冐肬胛胥胙胝胄胚胖脉胯胱脛脩脣脯腋"],
["e7a1","隋腆脾腓腑胼腱腮腥腦腴膃膈膊膀膂膠膕膤膣腟膓膩膰膵膾膸膽臀臂膺臉臍臑臙臘臈臚臟臠臧臺臻臾舁舂舅與舊舍舐舖舩舫舸舳艀艙艘艝艚艟艤艢艨艪艫舮艱艷艸艾芍芒芫芟芻芬苡苣苟苒苴苳苺莓范苻苹苞茆苜茉苙"],
["e8a1","茵茴茖茲茱荀茹荐荅茯茫茗茘莅莚莪莟莢莖茣莎莇莊荼莵荳荵莠莉莨菴萓菫菎菽萃菘萋菁菷萇菠菲萍萢萠莽萸蔆菻葭萪萼蕚蒄葷葫蒭葮蒂葩葆萬葯葹萵蓊葢蒹蒿蒟蓙蓍蒻蓚蓐蓁蓆蓖蒡蔡蓿蓴蔗蔘蔬蔟蔕蔔蓼蕀蕣蕘蕈"],
["e9a1","蕁蘂蕋蕕薀薤薈薑薊薨蕭薔薛藪薇薜蕷蕾薐藉薺藏薹藐藕藝藥藜藹蘊蘓蘋藾藺蘆蘢蘚蘰蘿虍乕虔號虧虱蚓蚣蚩蚪蚋蚌蚶蚯蛄蛆蚰蛉蠣蚫蛔蛞蛩蛬蛟蛛蛯蜒蜆蜈蜀蜃蛻蜑蜉蜍蛹蜊蜴蜿蜷蜻蜥蜩蜚蝠蝟蝸蝌蝎蝴蝗蝨蝮蝙"],
["eaa1","蝓蝣蝪蠅螢螟螂螯蟋螽蟀蟐雖螫蟄螳蟇蟆螻蟯蟲蟠蠏蠍蟾蟶蟷蠎蟒蠑蠖蠕蠢蠡蠱蠶蠹蠧蠻衄衂衒衙衞衢衫袁衾袞衵衽袵衲袂袗袒袮袙袢袍袤袰袿袱裃裄裔裘裙裝裹褂裼裴裨裲褄褌褊褓襃褞褥褪褫襁襄褻褶褸襌褝襠襞"],
["eba1","襦襤襭襪襯襴襷襾覃覈覊覓覘覡覩覦覬覯覲覺覽覿觀觚觜觝觧觴觸訃訖訐訌訛訝訥訶詁詛詒詆詈詼詭詬詢誅誂誄誨誡誑誥誦誚誣諄諍諂諚諫諳諧諤諱謔諠諢諷諞諛謌謇謚諡謖謐謗謠謳鞫謦謫謾謨譁譌譏譎證譖譛譚譫"],
["eca1","譟譬譯譴譽讀讌讎讒讓讖讙讚谺豁谿豈豌豎豐豕豢豬豸豺貂貉貅貊貍貎貔豼貘戝貭貪貽貲貳貮貶賈賁賤賣賚賽賺賻贄贅贊贇贏贍贐齎贓賍贔贖赧赭赱赳趁趙跂趾趺跏跚跖跌跛跋跪跫跟跣跼踈踉跿踝踞踐踟蹂踵踰踴蹊"],
["eda1","蹇蹉蹌蹐蹈蹙蹤蹠踪蹣蹕蹶蹲蹼躁躇躅躄躋躊躓躑躔躙躪躡躬躰軆躱躾軅軈軋軛軣軼軻軫軾輊輅輕輒輙輓輜輟輛輌輦輳輻輹轅轂輾轌轉轆轎轗轜轢轣轤辜辟辣辭辯辷迚迥迢迪迯邇迴逅迹迺逑逕逡逍逞逖逋逧逶逵逹迸"],
["eea1","遏遐遑遒逎遉逾遖遘遞遨遯遶隨遲邂遽邁邀邊邉邏邨邯邱邵郢郤扈郛鄂鄒鄙鄲鄰酊酖酘酣酥酩酳酲醋醉醂醢醫醯醪醵醴醺釀釁釉釋釐釖釟釡釛釼釵釶鈞釿鈔鈬鈕鈑鉞鉗鉅鉉鉤鉈銕鈿鉋鉐銜銖銓銛鉚鋏銹銷鋩錏鋺鍄錮"],
["efa1","錙錢錚錣錺錵錻鍜鍠鍼鍮鍖鎰鎬鎭鎔鎹鏖鏗鏨鏥鏘鏃鏝鏐鏈鏤鐚鐔鐓鐃鐇鐐鐶鐫鐵鐡鐺鑁鑒鑄鑛鑠鑢鑞鑪鈩鑰鑵鑷鑽鑚鑼鑾钁鑿閂閇閊閔閖閘閙閠閨閧閭閼閻閹閾闊濶闃闍闌闕闔闖關闡闥闢阡阨阮阯陂陌陏陋陷陜陞"],
["f0a1","陝陟陦陲陬隍隘隕隗險隧隱隲隰隴隶隸隹雎雋雉雍襍雜霍雕雹霄霆霈霓霎霑霏霖霙霤霪霰霹霽霾靄靆靈靂靉靜靠靤靦靨勒靫靱靹鞅靼鞁靺鞆鞋鞏鞐鞜鞨鞦鞣鞳鞴韃韆韈韋韜韭齏韲竟韶韵頏頌頸頤頡頷頽顆顏顋顫顯顰"],
["f1a1","顱顴顳颪颯颱颶飄飃飆飩飫餃餉餒餔餘餡餝餞餤餠餬餮餽餾饂饉饅饐饋饑饒饌饕馗馘馥馭馮馼駟駛駝駘駑駭駮駱駲駻駸騁騏騅駢騙騫騷驅驂驀驃騾驕驍驛驗驟驢驥驤驩驫驪骭骰骼髀髏髑髓體髞髟髢髣髦髯髫髮髴髱髷"],
["f2a1","髻鬆鬘鬚鬟鬢鬣鬥鬧鬨鬩鬪鬮鬯鬲魄魃魏魍魎魑魘魴鮓鮃鮑鮖鮗鮟鮠鮨鮴鯀鯊鮹鯆鯏鯑鯒鯣鯢鯤鯔鯡鰺鯲鯱鯰鰕鰔鰉鰓鰌鰆鰈鰒鰊鰄鰮鰛鰥鰤鰡鰰鱇鰲鱆鰾鱚鱠鱧鱶鱸鳧鳬鳰鴉鴈鳫鴃鴆鴪鴦鶯鴣鴟鵄鴕鴒鵁鴿鴾鵆鵈"],
["f3a1","鵝鵞鵤鵑鵐鵙鵲鶉鶇鶫鵯鵺鶚鶤鶩鶲鷄鷁鶻鶸鶺鷆鷏鷂鷙鷓鷸鷦鷭鷯鷽鸚鸛鸞鹵鹹鹽麁麈麋麌麒麕麑麝麥麩麸麪麭靡黌黎黏黐黔黜點黝黠黥黨黯黴黶黷黹黻黼黽鼇鼈皷鼕鼡鼬鼾齊齒齔齣齟齠齡齦齧齬齪齷齲齶龕龜龠"],
["f4a1","堯槇遙瑤凜熙"],
["f9a1","纊褜鍈銈蓜俉炻昱棈鋹曻彅丨仡仼伀伃伹佖侒侊侚侔俍偀倢俿倞偆偰偂傔僴僘兊兤冝冾凬刕劜劦勀勛匀匇匤卲厓厲叝﨎咜咊咩哿喆坙坥垬埈埇﨏塚增墲夋奓奛奝奣妤妺孖寀甯寘寬尞岦岺峵崧嵓﨑嵂嵭嶸嶹巐弡弴彧德"],
["faa1","忞恝悅悊惞惕愠惲愑愷愰憘戓抦揵摠撝擎敎昀昕昻昉昮昞昤晥晗晙晴晳暙暠暲暿曺朎朗杦枻桒柀栁桄棏﨓楨﨔榘槢樰橫橆橳橾櫢櫤毖氿汜沆汯泚洄涇浯涖涬淏淸淲淼渹湜渧渼溿澈澵濵瀅瀇瀨炅炫焏焄煜煆煇凞燁燾犱"],
["fba1","犾猤猪獷玽珉珖珣珒琇珵琦琪琩琮瑢璉璟甁畯皂皜皞皛皦益睆劯砡硎硤硺礰礼神祥禔福禛竑竧靖竫箞精絈絜綷綠緖繒罇羡羽茁荢荿菇菶葈蒴蕓蕙蕫﨟薰蘒﨡蠇裵訒訷詹誧誾諟諸諶譓譿賰賴贒赶﨣軏﨤逸遧郞都鄕鄧釚"],
["fca1","釗釞釭釮釤釥鈆鈐鈊鈺鉀鈼鉎鉙鉑鈹鉧銧鉷鉸鋧鋗鋙鋐﨧鋕鋠鋓錥錡鋻﨨錞鋿錝錂鍰鍗鎤鏆鏞鏸鐱鑅鑈閒隆﨩隝隯霳霻靃靍靏靑靕顗顥飯飼餧館馞驎髙髜魵魲鮏鮱鮻鰀鵰鵫鶴鸙黑"],
["fcf1","ⅰ",9,"￢￤＇＂"],
["8fa2af","˘ˇ¸˙˝¯˛˚～΄΅"],
["8fa2c2","¡¦¿"],
["8fa2eb","ºª©®™¤№"],
["8fa6e1","ΆΈΉΊΪ"],
["8fa6e7","Ό"],
["8fa6e9","ΎΫ"],
["8fa6ec","Ώ"],
["8fa6f1","άέήίϊΐόςύϋΰώ"],
["8fa7c2","Ђ",10,"ЎЏ"],
["8fa7f2","ђ",10,"ўџ"],
["8fa9a1","ÆĐ"],
["8fa9a4","Ħ"],
["8fa9a6","IJ"],
["8fa9a8","ŁĿ"],
["8fa9ab","ŊØŒ"],
["8fa9af","ŦÞ"],
["8fa9c1","æđðħıijĸłŀʼnŋøœßŧþ"],
["8faaa1","ÁÀÄÂĂǍĀĄÅÃĆĈČÇĊĎÉÈËÊĚĖĒĘ"],
["8faaba","ĜĞĢĠĤÍÌÏÎǏİĪĮĨĴĶĹĽĻŃŇŅÑÓÒÖÔǑŐŌÕŔŘŖŚŜŠŞŤŢÚÙÜÛŬǓŰŪŲŮŨǗǛǙǕŴÝŸŶŹŽŻ"],
["8faba1","áàäâăǎāąåãćĉčçċďéèëêěėēęǵĝğ"],
["8fabbd","ġĥíìïîǐ"],
["8fabc5","īįĩĵķĺľļńňņñóòöôǒőōõŕřŗśŝšşťţúùüûŭǔűūųůũǘǜǚǖŵýÿŷźžż"],
["8fb0a1","丂丄丅丌丒丟丣两丨丫丮丯丰丵乀乁乄乇乑乚乜乣乨乩乴乵乹乿亍亖亗亝亯亹仃仐仚仛仠仡仢仨仯仱仳仵份仾仿伀伂伃伈伋伌伒伕伖众伙伮伱你伳伵伷伹伻伾佀佂佈佉佋佌佒佔佖佘佟佣佪佬佮佱佷佸佹佺佽佾侁侂侄"],
["8fb1a1","侅侉侊侌侎侐侒侓侔侗侙侚侞侟侲侷侹侻侼侽侾俀俁俅俆俈俉俋俌俍俏俒俜俠俢俰俲俼俽俿倀倁倄倇倊倌倎倐倓倗倘倛倜倝倞倢倧倮倰倲倳倵偀偁偂偅偆偊偌偎偑偒偓偗偙偟偠偢偣偦偧偪偭偰偱倻傁傃傄傆傊傎傏傐"],
["8fb2a1","傒傓傔傖傛傜傞",4,"傪傯傰傹傺傽僀僃僄僇僌僎僐僓僔僘僜僝僟僢僤僦僨僩僯僱僶僺僾儃儆儇儈儋儌儍儎僲儐儗儙儛儜儝儞儣儧儨儬儭儯儱儳儴儵儸儹兂兊兏兓兕兗兘兟兤兦兾冃冄冋冎冘冝冡冣冭冸冺冼冾冿凂"],
["8fb3a1","凈减凑凒凓凕凘凞凢凥凮凲凳凴凷刁刂刅划刓刕刖刘刢刨刱刲刵刼剅剉剕剗剘剚剜剟剠剡剦剮剷剸剹劀劂劅劊劌劓劕劖劗劘劚劜劤劥劦劧劯劰劶劷劸劺劻劽勀勄勆勈勌勏勑勔勖勛勜勡勥勨勩勪勬勰勱勴勶勷匀匃匊匋"],
["8fb4a1","匌匑匓匘匛匜匞匟匥匧匨匩匫匬匭匰匲匵匼匽匾卂卌卋卙卛卡卣卥卬卭卲卹卾厃厇厈厎厓厔厙厝厡厤厪厫厯厲厴厵厷厸厺厽叀叅叏叒叓叕叚叝叞叠另叧叵吂吓吚吡吧吨吪启吱吴吵呃呄呇呍呏呞呢呤呦呧呩呫呭呮呴呿"],
["8fb5a1","咁咃咅咈咉咍咑咕咖咜咟咡咦咧咩咪咭咮咱咷咹咺咻咿哆哊响哎哠哪哬哯哶哼哾哿唀唁唅唈唉唌唍唎唕唪唫唲唵唶唻唼唽啁啇啉啊啍啐啑啘啚啛啞啠啡啤啦啿喁喂喆喈喎喏喑喒喓喔喗喣喤喭喲喿嗁嗃嗆嗉嗋嗌嗎嗑嗒"],
["8fb6a1","嗓嗗嗘嗛嗞嗢嗩嗶嗿嘅嘈嘊嘍",5,"嘙嘬嘰嘳嘵嘷嘹嘻嘼嘽嘿噀噁噃噄噆噉噋噍噏噔噞噠噡噢噣噦噩噭噯噱噲噵嚄嚅嚈嚋嚌嚕嚙嚚嚝嚞嚟嚦嚧嚨嚩嚫嚬嚭嚱嚳嚷嚾囅囉囊囋囏囐囌囍囙囜囝囟囡囤",4,"囱囫园"],
["8fb7a1","囶囷圁圂圇圊圌圑圕圚圛圝圠圢圣圤圥圩圪圬圮圯圳圴圽圾圿坅坆坌坍坒坢坥坧坨坫坭",4,"坳坴坵坷坹坺坻坼坾垁垃垌垔垗垙垚垜垝垞垟垡垕垧垨垩垬垸垽埇埈埌埏埕埝埞埤埦埧埩埭埰埵埶埸埽埾埿堃堄堈堉埡"],
["8fb8a1","堌堍堛堞堟堠堦堧堭堲堹堿塉塌塍塏塐塕塟塡塤塧塨塸塼塿墀墁墇墈墉墊墌墍墏墐墔墖墝墠墡墢墦墩墱墲壄墼壂壈壍壎壐壒壔壖壚壝壡壢壩壳夅夆夋夌夒夓夔虁夝夡夣夤夨夯夰夳夵夶夿奃奆奒奓奙奛奝奞奟奡奣奫奭"],
["8fb9a1","奯奲奵奶她奻奼妋妌妎妒妕妗妟妤妧妭妮妯妰妳妷妺妼姁姃姄姈姊姍姒姝姞姟姣姤姧姮姯姱姲姴姷娀娄娌娍娎娒娓娞娣娤娧娨娪娭娰婄婅婇婈婌婐婕婞婣婥婧婭婷婺婻婾媋媐媓媖媙媜媞媟媠媢媧媬媱媲媳媵媸媺媻媿"],
["8fbaa1","嫄嫆嫈嫏嫚嫜嫠嫥嫪嫮嫵嫶嫽嬀嬁嬈嬗嬴嬙嬛嬝嬡嬥嬭嬸孁孋孌孒孖孞孨孮孯孼孽孾孿宁宄宆宊宎宐宑宓宔宖宨宩宬宭宯宱宲宷宺宼寀寁寍寏寖",4,"寠寯寱寴寽尌尗尞尟尣尦尩尫尬尮尰尲尵尶屙屚屜屢屣屧屨屩"],
["8fbba1","屭屰屴屵屺屻屼屽岇岈岊岏岒岝岟岠岢岣岦岪岲岴岵岺峉峋峒峝峗峮峱峲峴崁崆崍崒崫崣崤崦崧崱崴崹崽崿嵂嵃嵆嵈嵕嵑嵙嵊嵟嵠嵡嵢嵤嵪嵭嵰嵹嵺嵾嵿嶁嶃嶈嶊嶒嶓嶔嶕嶙嶛嶟嶠嶧嶫嶰嶴嶸嶹巃巇巋巐巎巘巙巠巤"],
["8fbca1","巩巸巹帀帇帍帒帔帕帘帟帠帮帨帲帵帾幋幐幉幑幖幘幛幜幞幨幪",4,"幰庀庋庎庢庤庥庨庪庬庱庳庽庾庿廆廌廋廎廑廒廔廕廜廞廥廫异弆弇弈弎弙弜弝弡弢弣弤弨弫弬弮弰弴弶弻弽弿彀彄彅彇彍彐彔彘彛彠彣彤彧"],
["8fbda1","彯彲彴彵彸彺彽彾徉徍徏徖徜徝徢徧徫徤徬徯徰徱徸忄忇忈忉忋忐",4,"忞忡忢忨忩忪忬忭忮忯忲忳忶忺忼怇怊怍怓怔怗怘怚怟怤怭怳怵恀恇恈恉恌恑恔恖恗恝恡恧恱恾恿悂悆悈悊悎悑悓悕悘悝悞悢悤悥您悰悱悷"],
["8fbea1","悻悾惂惄惈惉惊惋惎惏惔惕惙惛惝惞惢惥惲惵惸惼惽愂愇愊愌愐",4,"愖愗愙愜愞愢愪愫愰愱愵愶愷愹慁慅慆慉慞慠慬慲慸慻慼慿憀憁憃憄憋憍憒憓憗憘憜憝憟憠憥憨憪憭憸憹憼懀懁懂懎懏懕懜懝懞懟懡懢懧懩懥"],
["8fbfa1","懬懭懯戁戃戄戇戓戕戜戠戢戣戧戩戫戹戽扂扃扄扆扌扐扑扒扔扖扚扜扤扭扯扳扺扽抍抎抏抐抦抨抳抶抷抺抾抿拄拎拕拖拚拪拲拴拼拽挃挄挊挋挍挐挓挖挘挩挪挭挵挶挹挼捁捂捃捄捆捊捋捎捒捓捔捘捛捥捦捬捭捱捴捵"],
["8fc0a1","捸捼捽捿掂掄掇掊掐掔掕掙掚掞掤掦掭掮掯掽揁揅揈揎揑揓揔揕揜揠揥揪揬揲揳揵揸揹搉搊搐搒搔搘搞搠搢搤搥搩搪搯搰搵搽搿摋摏摑摒摓摔摚摛摜摝摟摠摡摣摭摳摴摻摽撅撇撏撐撑撘撙撛撝撟撡撣撦撨撬撳撽撾撿"],
["8fc1a1","擄擉擊擋擌擎擐擑擕擗擤擥擩擪擭擰擵擷擻擿攁攄攈攉攊攏攓攔攖攙攛攞攟攢攦攩攮攱攺攼攽敃敇敉敐敒敔敟敠敧敫敺敽斁斅斊斒斕斘斝斠斣斦斮斲斳斴斿旂旈旉旎旐旔旖旘旟旰旲旴旵旹旾旿昀昄昈昉昍昑昒昕昖昝"],
["8fc2a1","昞昡昢昣昤昦昩昪昫昬昮昰昱昳昹昷晀晅晆晊晌晑晎晗晘晙晛晜晠晡曻晪晫晬晾晳晵晿晷晸晹晻暀晼暋暌暍暐暒暙暚暛暜暟暠暤暭暱暲暵暻暿曀曂曃曈曌曎曏曔曛曟曨曫曬曮曺朅朇朎朓朙朜朠朢朳朾杅杇杈杌杔杕杝"],
["8fc3a1","杦杬杮杴杶杻极构枎枏枑枓枖枘枙枛枰枱枲枵枻枼枽柹柀柂柃柅柈柉柒柗柙柜柡柦柰柲柶柷桒栔栙栝栟栨栧栬栭栯栰栱栳栻栿桄桅桊桌桕桗桘桛桫桮",4,"桵桹桺桻桼梂梄梆梈梖梘梚梜梡梣梥梩梪梮梲梻棅棈棌棏"],
["8fc4a1","棐棑棓棖棙棜棝棥棨棪棫棬棭棰棱棵棶棻棼棽椆椉椊椐椑椓椖椗椱椳椵椸椻楂楅楉楎楗楛楣楤楥楦楨楩楬楰楱楲楺楻楿榀榍榒榖榘榡榥榦榨榫榭榯榷榸榺榼槅槈槑槖槗槢槥槮槯槱槳槵槾樀樁樃樏樑樕樚樝樠樤樨樰樲"],
["8fc5a1","樴樷樻樾樿橅橆橉橊橎橐橑橒橕橖橛橤橧橪橱橳橾檁檃檆檇檉檋檑檛檝檞檟檥檫檯檰檱檴檽檾檿櫆櫉櫈櫌櫐櫔櫕櫖櫜櫝櫤櫧櫬櫰櫱櫲櫼櫽欂欃欆欇欉欏欐欑欗欛欞欤欨欫欬欯欵欶欻欿歆歊歍歒歖歘歝歠歧歫歮歰歵歽"],
["8fc6a1","歾殂殅殗殛殟殠殢殣殨殩殬殭殮殰殸殹殽殾毃毄毉毌毖毚毡毣毦毧毮毱毷毹毿氂氄氅氉氍氎氐氒氙氟氦氧氨氬氮氳氵氶氺氻氿汊汋汍汏汒汔汙汛汜汫汭汯汴汶汸汹汻沅沆沇沉沔沕沗沘沜沟沰沲沴泂泆泍泏泐泑泒泔泖"],
["8fc7a1","泚泜泠泧泩泫泬泮泲泴洄洇洊洎洏洑洓洚洦洧洨汧洮洯洱洹洼洿浗浞浟浡浥浧浯浰浼涂涇涑涒涔涖涗涘涪涬涴涷涹涽涿淄淈淊淎淏淖淛淝淟淠淢淥淩淯淰淴淶淼渀渄渞渢渧渲渶渹渻渼湄湅湈湉湋湏湑湒湓湔湗湜湝湞"],
["8fc8a1","湢湣湨湳湻湽溍溓溙溠溧溭溮溱溳溻溿滀滁滃滇滈滊滍滎滏滫滭滮滹滻滽漄漈漊漌漍漖漘漚漛漦漩漪漯漰漳漶漻漼漭潏潑潒潓潗潙潚潝潞潡潢潨潬潽潾澃澇澈澋澌澍澐澒澓澔澖澚澟澠澥澦澧澨澮澯澰澵澶澼濅濇濈濊"],
["8fc9a1","濚濞濨濩濰濵濹濼濽瀀瀅瀆瀇瀍瀗瀠瀣瀯瀴瀷瀹瀼灃灄灈灉灊灋灔灕灝灞灎灤灥灬灮灵灶灾炁炅炆炔",4,"炛炤炫炰炱炴炷烊烑烓烔烕烖烘烜烤烺焃",4,"焋焌焏焞焠焫焭焯焰焱焸煁煅煆煇煊煋煐煒煗煚煜煞煠"],
["8fcaa1","煨煹熀熅熇熌熒熚熛熠熢熯熰熲熳熺熿燀燁燄燋燌燓燖燙燚燜燸燾爀爇爈爉爓爗爚爝爟爤爫爯爴爸爹牁牂牃牅牎牏牐牓牕牖牚牜牞牠牣牨牫牮牯牱牷牸牻牼牿犄犉犍犎犓犛犨犭犮犱犴犾狁狇狉狌狕狖狘狟狥狳狴狺狻"],
["8fcba1","狾猂猄猅猇猋猍猒猓猘猙猞猢猤猧猨猬猱猲猵猺猻猽獃獍獐獒獖獘獝獞獟獠獦獧獩獫獬獮獯獱獷獹獼玀玁玃玅玆玎玐玓玕玗玘玜玞玟玠玢玥玦玪玫玭玵玷玹玼玽玿珅珆珉珋珌珏珒珓珖珙珝珡珣珦珧珩珴珵珷珹珺珻珽"],
["8fcca1","珿琀琁琄琇琊琑琚琛琤琦琨",9,"琹瑀瑃瑄瑆瑇瑋瑍瑑瑒瑗瑝瑢瑦瑧瑨瑫瑭瑮瑱瑲璀璁璅璆璇璉璏璐璑璒璘璙璚璜璟璠璡璣璦璨璩璪璫璮璯璱璲璵璹璻璿瓈瓉瓌瓐瓓瓘瓚瓛瓞瓟瓤瓨瓪瓫瓯瓴瓺瓻瓼瓿甆"],
["8fcda1","甒甖甗甠甡甤甧甩甪甯甶甹甽甾甿畀畃畇畈畎畐畒畗畞畟畡畯畱畹",5,"疁疅疐疒疓疕疙疜疢疤疴疺疿痀痁痄痆痌痎痏痗痜痟痠痡痤痧痬痮痯痱痹瘀瘂瘃瘄瘇瘈瘊瘌瘏瘒瘓瘕瘖瘙瘛瘜瘝瘞瘣瘥瘦瘩瘭瘲瘳瘵瘸瘹"],
["8fcea1","瘺瘼癊癀癁癃癄癅癉癋癕癙癟癤癥癭癮癯癱癴皁皅皌皍皕皛皜皝皟皠皢",6,"皪皭皽盁盅盉盋盌盎盔盙盠盦盨盬盰盱盶盹盼眀眆眊眎眒眔眕眗眙眚眜眢眨眭眮眯眴眵眶眹眽眾睂睅睆睊睍睎睏睒睖睗睜睞睟睠睢"],
["8fcfa1","睤睧睪睬睰睲睳睴睺睽瞀瞄瞌瞍瞔瞕瞖瞚瞟瞢瞧瞪瞮瞯瞱瞵瞾矃矉矑矒矕矙矞矟矠矤矦矪矬矰矱矴矸矻砅砆砉砍砎砑砝砡砢砣砭砮砰砵砷硃硄硇硈硌硎硒硜硞硠硡硣硤硨硪确硺硾碊碏碔碘碡碝碞碟碤碨碬碭碰碱碲碳"],
["8fd0a1","碻碽碿磇磈磉磌磎磒磓磕磖磤磛磟磠磡磦磪磲磳礀磶磷磺磻磿礆礌礐礚礜礞礟礠礥礧礩礭礱礴礵礻礽礿祄祅祆祊祋祏祑祔祘祛祜祧祩祫祲祹祻祼祾禋禌禑禓禔禕禖禘禛禜禡禨禩禫禯禱禴禸离秂秄秇秈秊秏秔秖秚秝秞"],
["8fd1a1","秠秢秥秪秫秭秱秸秼稂稃稇稉稊稌稑稕稛稞稡稧稫稭稯稰稴稵稸稹稺穄穅穇穈穌穕穖穙穜穝穟穠穥穧穪穭穵穸穾窀窂窅窆窊窋窐窑窔窞窠窣窬窳窵窹窻窼竆竉竌竎竑竛竨竩竫竬竱竴竻竽竾笇笔笟笣笧笩笪笫笭笮笯笰"],
["8fd2a1","笱笴笽笿筀筁筇筎筕筠筤筦筩筪筭筯筲筳筷箄箉箎箐箑箖箛箞箠箥箬箯箰箲箵箶箺箻箼箽篂篅篈篊篔篖篗篙篚篛篨篪篲篴篵篸篹篺篼篾簁簂簃簄簆簉簋簌簎簏簙簛簠簥簦簨簬簱簳簴簶簹簺籆籊籕籑籒籓籙",5],
["8fd3a1","籡籣籧籩籭籮籰籲籹籼籽粆粇粏粔粞粠粦粰粶粷粺粻粼粿糄糇糈糉糍糏糓糔糕糗糙糚糝糦糩糫糵紃紇紈紉紏紑紒紓紖紝紞紣紦紪紭紱紼紽紾絀絁絇絈絍絑絓絗絙絚絜絝絥絧絪絰絸絺絻絿綁綂綃綅綆綈綋綌綍綑綖綗綝"],
["8fd4a1","綞綦綧綪綳綶綷綹緂",4,"緌緍緎緗緙縀緢緥緦緪緫緭緱緵緶緹緺縈縐縑縕縗縜縝縠縧縨縬縭縯縳縶縿繄繅繇繎繐繒繘繟繡繢繥繫繮繯繳繸繾纁纆纇纊纍纑纕纘纚纝纞缼缻缽缾缿罃罄罇罏罒罓罛罜罝罡罣罤罥罦罭"],
["8fd5a1","罱罽罾罿羀羋羍羏羐羑羖羗羜羡羢羦羪羭羴羼羿翀翃翈翎翏翛翟翣翥翨翬翮翯翲翺翽翾翿耇耈耊耍耎耏耑耓耔耖耝耞耟耠耤耦耬耮耰耴耵耷耹耺耼耾聀聄聠聤聦聭聱聵肁肈肎肜肞肦肧肫肸肹胈胍胏胒胔胕胗胘胠胭胮"],
["8fd6a1","胰胲胳胶胹胺胾脃脋脖脗脘脜脞脠脤脧脬脰脵脺脼腅腇腊腌腒腗腠腡腧腨腩腭腯腷膁膐膄膅膆膋膎膖膘膛膞膢膮膲膴膻臋臃臅臊臎臏臕臗臛臝臞臡臤臫臬臰臱臲臵臶臸臹臽臿舀舃舏舓舔舙舚舝舡舢舨舲舴舺艃艄艅艆"],
["8fd7a1","艋艎艏艑艖艜艠艣艧艭艴艻艽艿芀芁芃芄芇芉芊芎芑芔芖芘芚芛芠芡芣芤芧芨芩芪芮芰芲芴芷芺芼芾芿苆苐苕苚苠苢苤苨苪苭苯苶苷苽苾茀茁茇茈茊茋荔茛茝茞茟茡茢茬茭茮茰茳茷茺茼茽荂荃荄荇荍荎荑荕荖荗荰荸"],
["8fd8a1","荽荿莀莂莄莆莍莒莔莕莘莙莛莜莝莦莧莩莬莾莿菀菇菉菏菐菑菔菝荓菨菪菶菸菹菼萁萆萊萏萑萕萙莭萯萹葅葇葈葊葍葏葑葒葖葘葙葚葜葠葤葥葧葪葰葳葴葶葸葼葽蒁蒅蒒蒓蒕蒞蒦蒨蒩蒪蒯蒱蒴蒺蒽蒾蓀蓂蓇蓈蓌蓏蓓"],
["8fd9a1","蓜蓧蓪蓯蓰蓱蓲蓷蔲蓺蓻蓽蔂蔃蔇蔌蔎蔐蔜蔞蔢蔣蔤蔥蔧蔪蔫蔯蔳蔴蔶蔿蕆蕏",4,"蕖蕙蕜",6,"蕤蕫蕯蕹蕺蕻蕽蕿薁薅薆薉薋薌薏薓薘薝薟薠薢薥薧薴薶薷薸薼薽薾薿藂藇藊藋藎薭藘藚藟藠藦藨藭藳藶藼"],
["8fdaa1","藿蘀蘄蘅蘍蘎蘐蘑蘒蘘蘙蘛蘞蘡蘧蘩蘶蘸蘺蘼蘽虀虂虆虒虓虖虗虘虙虝虠",4,"虩虬虯虵虶虷虺蚍蚑蚖蚘蚚蚜蚡蚦蚧蚨蚭蚱蚳蚴蚵蚷蚸蚹蚿蛀蛁蛃蛅蛑蛒蛕蛗蛚蛜蛠蛣蛥蛧蚈蛺蛼蛽蜄蜅蜇蜋蜎蜏蜐蜓蜔蜙蜞蜟蜡蜣"],
["8fdba1","蜨蜮蜯蜱蜲蜹蜺蜼蜽蜾蝀蝃蝅蝍蝘蝝蝡蝤蝥蝯蝱蝲蝻螃",6,"螋螌螐螓螕螗螘螙螞螠螣螧螬螭螮螱螵螾螿蟁蟈蟉蟊蟎蟕蟖蟙蟚蟜蟟蟢蟣蟤蟪蟫蟭蟱蟳蟸蟺蟿蠁蠃蠆蠉蠊蠋蠐蠙蠒蠓蠔蠘蠚蠛蠜蠞蠟蠨蠭蠮蠰蠲蠵"],
["8fdca1","蠺蠼衁衃衅衈衉衊衋衎衑衕衖衘衚衜衟衠衤衩衱衹衻袀袘袚袛袜袟袠袨袪袺袽袾裀裊",4,"裑裒裓裛裞裧裯裰裱裵裷褁褆褍褎褏褕褖褘褙褚褜褠褦褧褨褰褱褲褵褹褺褾襀襂襅襆襉襏襒襗襚襛襜襡襢襣襫襮襰襳襵襺"],
["8fdda1","襻襼襽覉覍覐覔覕覛覜覟覠覥覰覴覵覶覷覼觔",4,"觥觩觫觭觱觳觶觹觽觿訄訅訇訏訑訒訔訕訞訠訢訤訦訫訬訯訵訷訽訾詀詃詅詇詉詍詎詓詖詗詘詜詝詡詥詧詵詶詷詹詺詻詾詿誀誃誆誋誏誐誒誖誗誙誟誧誩誮誯誳"],
["8fdea1","誶誷誻誾諃諆諈諉諊諑諓諔諕諗諝諟諬諰諴諵諶諼諿謅謆謋謑謜謞謟謊謭謰謷謼譂",4,"譈譒譓譔譙譍譞譣譭譶譸譹譼譾讁讄讅讋讍讏讔讕讜讞讟谸谹谽谾豅豇豉豋豏豑豓豔豗豘豛豝豙豣豤豦豨豩豭豳豵豶豻豾貆"],
["8fdfa1","貇貋貐貒貓貙貛貜貤貹貺賅賆賉賋賏賖賕賙賝賡賨賬賯賰賲賵賷賸賾賿贁贃贉贒贗贛赥赩赬赮赿趂趄趈趍趐趑趕趞趟趠趦趫趬趯趲趵趷趹趻跀跅跆跇跈跊跎跑跔跕跗跙跤跥跧跬跰趼跱跲跴跽踁踄踅踆踋踑踔踖踠踡踢"],
["8fe0a1","踣踦踧踱踳踶踷踸踹踽蹀蹁蹋蹍蹎蹏蹔蹛蹜蹝蹞蹡蹢蹩蹬蹭蹯蹰蹱蹹蹺蹻躂躃躉躐躒躕躚躛躝躞躢躧躩躭躮躳躵躺躻軀軁軃軄軇軏軑軔軜軨軮軰軱軷軹軺軭輀輂輇輈輏輐輖輗輘輞輠輡輣輥輧輨輬輭輮輴輵輶輷輺轀轁"],
["8fe1a1","轃轇轏轑",4,"轘轝轞轥辝辠辡辤辥辦辵辶辸达迀迁迆迊迋迍运迒迓迕迠迣迤迨迮迱迵迶迻迾适逄逈逌逘逛逨逩逯逪逬逭逳逴逷逿遃遄遌遛遝遢遦遧遬遰遴遹邅邈邋邌邎邐邕邗邘邙邛邠邡邢邥邰邲邳邴邶邽郌邾郃"],
["8fe2a1","郄郅郇郈郕郗郘郙郜郝郟郥郒郶郫郯郰郴郾郿鄀鄄鄅鄆鄈鄍鄐鄔鄖鄗鄘鄚鄜鄞鄠鄥鄢鄣鄧鄩鄮鄯鄱鄴鄶鄷鄹鄺鄼鄽酃酇酈酏酓酗酙酚酛酡酤酧酭酴酹酺酻醁醃醅醆醊醎醑醓醔醕醘醞醡醦醨醬醭醮醰醱醲醳醶醻醼醽醿"],
["8fe3a1","釂釃釅釓釔釗釙釚釞釤釥釩釪釬",5,"釷釹釻釽鈀鈁鈄鈅鈆鈇鈉鈊鈌鈐鈒鈓鈖鈘鈜鈝鈣鈤鈥鈦鈨鈮鈯鈰鈳鈵鈶鈸鈹鈺鈼鈾鉀鉂鉃鉆鉇鉊鉍鉎鉏鉑鉘鉙鉜鉝鉠鉡鉥鉧鉨鉩鉮鉯鉰鉵",4,"鉻鉼鉽鉿銈銉銊銍銎銒銗"],
["8fe4a1","銙銟銠銤銥銧銨銫銯銲銶銸銺銻銼銽銿",4,"鋅鋆鋇鋈鋋鋌鋍鋎鋐鋓鋕鋗鋘鋙鋜鋝鋟鋠鋡鋣鋥鋧鋨鋬鋮鋰鋹鋻鋿錀錂錈錍錑錔錕錜錝錞錟錡錤錥錧錩錪錳錴錶錷鍇鍈鍉鍐鍑鍒鍕鍗鍘鍚鍞鍤鍥鍧鍩鍪鍭鍯鍰鍱鍳鍴鍶"],
["8fe5a1","鍺鍽鍿鎀鎁鎂鎈鎊鎋鎍鎏鎒鎕鎘鎛鎞鎡鎣鎤鎦鎨鎫鎴鎵鎶鎺鎩鏁鏄鏅鏆鏇鏉",4,"鏓鏙鏜鏞鏟鏢鏦鏧鏹鏷鏸鏺鏻鏽鐁鐂鐄鐈鐉鐍鐎鐏鐕鐖鐗鐟鐮鐯鐱鐲鐳鐴鐻鐿鐽鑃鑅鑈鑊鑌鑕鑙鑜鑟鑡鑣鑨鑫鑭鑮鑯鑱鑲钄钃镸镹"],
["8fe6a1","镾閄閈閌閍閎閝閞閟閡閦閩閫閬閴閶閺閽閿闆闈闉闋闐闑闒闓闙闚闝闞闟闠闤闦阝阞阢阤阥阦阬阱阳阷阸阹阺阼阽陁陒陔陖陗陘陡陮陴陻陼陾陿隁隂隃隄隉隑隖隚隝隟隤隥隦隩隮隯隳隺雊雒嶲雘雚雝雞雟雩雯雱雺霂"],
["8fe7a1","霃霅霉霚霛霝霡霢霣霨霱霳靁靃靊靎靏靕靗靘靚靛靣靧靪靮靳靶靷靸靻靽靿鞀鞉鞕鞖鞗鞙鞚鞞鞟鞢鞬鞮鞱鞲鞵鞶鞸鞹鞺鞼鞾鞿韁韄韅韇韉韊韌韍韎韐韑韔韗韘韙韝韞韠韛韡韤韯韱韴韷韸韺頇頊頙頍頎頔頖頜頞頠頣頦"],
["8fe8a1","頫頮頯頰頲頳頵頥頾顄顇顊顑顒顓顖顗顙顚顢顣顥顦顪顬颫颭颮颰颴颷颸颺颻颿飂飅飈飌飡飣飥飦飧飪飳飶餂餇餈餑餕餖餗餚餛餜餟餢餦餧餫餱",4,"餹餺餻餼饀饁饆饇饈饍饎饔饘饙饛饜饞饟饠馛馝馟馦馰馱馲馵"],
["8fe9a1","馹馺馽馿駃駉駓駔駙駚駜駞駧駪駫駬駰駴駵駹駽駾騂騃騄騋騌騐騑騖騞騠騢騣騤騧騭騮騳騵騶騸驇驁驄驊驋驌驎驑驔驖驝骪骬骮骯骲骴骵骶骹骻骾骿髁髃髆髈髎髐髒髕髖髗髛髜髠髤髥髧髩髬髲髳髵髹髺髽髿",4],
["8feaa1","鬄鬅鬈鬉鬋鬌鬍鬎鬐鬒鬖鬙鬛鬜鬠鬦鬫鬭鬳鬴鬵鬷鬹鬺鬽魈魋魌魕魖魗魛魞魡魣魥魦魨魪",4,"魳魵魷魸魹魿鮀鮄鮅鮆鮇鮉鮊鮋鮍鮏鮐鮔鮚鮝鮞鮦鮧鮩鮬鮰鮱鮲鮷鮸鮻鮼鮾鮿鯁鯇鯈鯎鯐鯗鯘鯝鯟鯥鯧鯪鯫鯯鯳鯷鯸"],
["8feba1","鯹鯺鯽鯿鰀鰂鰋鰏鰑鰖鰘鰙鰚鰜鰞鰢鰣鰦",4,"鰱鰵鰶鰷鰽鱁鱃鱄鱅鱉鱊鱎鱏鱐鱓鱔鱖鱘鱛鱝鱞鱟鱣鱩鱪鱜鱫鱨鱮鱰鱲鱵鱷鱻鳦鳲鳷鳹鴋鴂鴑鴗鴘鴜鴝鴞鴯鴰鴲鴳鴴鴺鴼鵅鴽鵂鵃鵇鵊鵓鵔鵟鵣鵢鵥鵩鵪鵫鵰鵶鵷鵻"],
["8feca1","鵼鵾鶃鶄鶆鶊鶍鶎鶒鶓鶕鶖鶗鶘鶡鶪鶬鶮鶱鶵鶹鶼鶿鷃鷇鷉鷊鷔鷕鷖鷗鷚鷞鷟鷠鷥鷧鷩鷫鷮鷰鷳鷴鷾鸊鸂鸇鸎鸐鸑鸒鸕鸖鸙鸜鸝鹺鹻鹼麀麂麃麄麅麇麎麏麖麘麛麞麤麨麬麮麯麰麳麴麵黆黈黋黕黟黤黧黬黭黮黰黱黲黵"],
["8feda1","黸黿鼂鼃鼉鼏鼐鼑鼒鼔鼖鼗鼙鼚鼛鼟鼢鼦鼪鼫鼯鼱鼲鼴鼷鼹鼺鼼鼽鼿齁齃",4,"齓齕齖齗齘齚齝齞齨齩齭",4,"齳齵齺齽龏龐龑龒龔龖龗龞龡龢龣龥"]
]

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["9740","諭輸唯佑優勇友宥幽悠憂揖有柚湧涌猶猷由祐裕誘遊邑郵雄融夕予余与誉輿預傭幼妖容庸揚揺擁曜楊様洋溶熔用窯羊耀葉蓉要謡踊遥陽養慾抑欲"],
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["9940","僉僊傳僂僖僞僥僭僣僮價僵儉儁儂儖儕儔儚儡儺儷儼儻儿兀兒兌兔兢竸兩兪兮冀冂囘册冉冏冑冓冕冖冤冦冢冩冪冫决冱冲冰况冽凅凉凛几處凩凭"],
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["e640","襦襤襭襪襯襴襷襾覃覈覊覓覘覡覩覦覬覯覲覺覽覿觀觚觜觝觧觴觸訃訖訐訌訛訝訥訶詁詛詒詆詈詼詭詬詢誅誂誄誨誡誑誥誦誚誣諄諍諂諚諫諳諧"],
["e680","諤諱謔諠諢諷諞諛謌謇謚諡謖謐謗謠謳鞫謦謫謾謨譁譌譏譎證譖譛譚譫譟譬譯譴譽讀讌讎讒讓讖讙讚谺豁谿豈豌豎豐豕豢豬豸豺貂貉貅貊貍貎貔豼貘戝貭貪貽貲貳貮貶賈賁賤賣賚賽賺賻贄贅贊贇贏贍贐齎贓賍贔贖赧赭赱赳趁趙跂趾趺跏跚跖跌跛跋跪跫跟跣跼踈踉跿踝踞踐踟蹂踵踰踴蹊"],
["e740","蹇蹉蹌蹐蹈蹙蹤蹠踪蹣蹕蹶蹲蹼躁躇躅躄躋躊躓躑躔躙躪躡躬躰軆躱躾軅軈軋軛軣軼軻軫軾輊輅輕輒輙輓輜輟輛輌輦輳輻輹轅轂輾轌轉轆轎轗轜"],
["e780","轢轣轤辜辟辣辭辯辷迚迥迢迪迯邇迴逅迹迺逑逕逡逍逞逖逋逧逶逵逹迸遏遐遑遒逎遉逾遖遘遞遨遯遶隨遲邂遽邁邀邊邉邏邨邯邱邵郢郤扈郛鄂鄒鄙鄲鄰酊酖酘酣酥酩酳酲醋醉醂醢醫醯醪醵醴醺釀釁釉釋釐釖釟釡釛釼釵釶鈞釿鈔鈬鈕鈑鉞鉗鉅鉉鉤鉈銕鈿鉋鉐銜銖銓銛鉚鋏銹銷鋩錏鋺鍄錮"],
["e840","錙錢錚錣錺錵錻鍜鍠鍼鍮鍖鎰鎬鎭鎔鎹鏖鏗鏨鏥鏘鏃鏝鏐鏈鏤鐚鐔鐓鐃鐇鐐鐶鐫鐵鐡鐺鑁鑒鑄鑛鑠鑢鑞鑪鈩鑰鑵鑷鑽鑚鑼鑾钁鑿閂閇閊閔閖閘閙"],
["e880","閠閨閧閭閼閻閹閾闊濶闃闍闌闕闔闖關闡闥闢阡阨阮阯陂陌陏陋陷陜陞陝陟陦陲陬隍隘隕隗險隧隱隲隰隴隶隸隹雎雋雉雍襍雜霍雕雹霄霆霈霓霎霑霏霖霙霤霪霰霹霽霾靄靆靈靂靉靜靠靤靦靨勒靫靱靹鞅靼鞁靺鞆鞋鞏鞐鞜鞨鞦鞣鞳鞴韃韆韈韋韜韭齏韲竟韶韵頏頌頸頤頡頷頽顆顏顋顫顯顰"],
["e940","顱顴顳颪颯颱颶飄飃飆飩飫餃餉餒餔餘餡餝餞餤餠餬餮餽餾饂饉饅饐饋饑饒饌饕馗馘馥馭馮馼駟駛駝駘駑駭駮駱駲駻駸騁騏騅駢騙騫騷驅驂驀驃"],
["e980","騾驕驍驛驗驟驢驥驤驩驫驪骭骰骼髀髏髑髓體髞髟髢髣髦髯髫髮髴髱髷髻鬆鬘鬚鬟鬢鬣鬥鬧鬨鬩鬪鬮鬯鬲魄魃魏魍魎魑魘魴鮓鮃鮑鮖鮗鮟鮠鮨鮴鯀鯊鮹鯆鯏鯑鯒鯣鯢鯤鯔鯡鰺鯲鯱鯰鰕鰔鰉鰓鰌鰆鰈鰒鰊鰄鰮鰛鰥鰤鰡鰰鱇鰲鱆鰾鱚鱠鱧鱶鱸鳧鳬鳰鴉鴈鳫鴃鴆鴪鴦鶯鴣鴟鵄鴕鴒鵁鴿鴾鵆鵈"],
["ea40","鵝鵞鵤鵑鵐鵙鵲鶉鶇鶫鵯鵺鶚鶤鶩鶲鷄鷁鶻鶸鶺鷆鷏鷂鷙鷓鷸鷦鷭鷯鷽鸚鸛鸞鹵鹹鹽麁麈麋麌麒麕麑麝麥麩麸麪麭靡黌黎黏黐黔黜點黝黠黥黨黯"],
["ea80","黴黶黷黹黻黼黽鼇鼈皷鼕鼡鼬鼾齊齒齔齣齟齠齡齦齧齬齪齷齲齶龕龜龠堯槇遙瑤凜熙"],
["ed40","纊褜鍈銈蓜俉炻昱棈鋹曻彅丨仡仼伀伃伹佖侒侊侚侔俍偀倢俿倞偆偰偂傔僴僘兊兤冝冾凬刕劜劦勀勛匀匇匤卲厓厲叝﨎咜咊咩哿喆坙坥垬埈埇﨏"],
["ed80","塚增墲夋奓奛奝奣妤妺孖寀甯寘寬尞岦岺峵崧嵓﨑嵂嵭嶸嶹巐弡弴彧德忞恝悅悊惞惕愠惲愑愷愰憘戓抦揵摠撝擎敎昀昕昻昉昮昞昤晥晗晙晴晳暙暠暲暿曺朎朗杦枻桒柀栁桄棏﨓楨﨔榘槢樰橫橆橳橾櫢櫤毖氿汜沆汯泚洄涇浯涖涬淏淸淲淼渹湜渧渼溿澈澵濵瀅瀇瀨炅炫焏焄煜煆煇凞燁燾犱"],
["ee40","犾猤猪獷玽珉珖珣珒琇珵琦琪琩琮瑢璉璟甁畯皂皜皞皛皦益睆劯砡硎硤硺礰礼神祥禔福禛竑竧靖竫箞精絈絜綷綠緖繒罇羡羽茁荢荿菇菶葈蒴蕓蕙"],
["ee80","蕫﨟薰蘒﨡蠇裵訒訷詹誧誾諟諸諶譓譿賰賴贒赶﨣軏﨤逸遧郞都鄕鄧釚釗釞釭釮釤釥鈆鈐鈊鈺鉀鈼鉎鉙鉑鈹鉧銧鉷鉸鋧鋗鋙鋐﨧鋕鋠鋓錥錡鋻﨨錞鋿錝錂鍰鍗鎤鏆鏞鏸鐱鑅鑈閒隆﨩隝隯霳霻靃靍靏靑靕顗顥飯飼餧館馞驎髙髜魵魲鮏鮱鮻鰀鵰鵫鶴鸙黑"],
["eeef","ⅰ",9,"￢￤＇＂"],
["f040","",62],
["f080","",124],
["f140","",62],
["f180","",124],
["f240","",62],
["f280","",124],
["f340","",62],
["f380","",124],
["f440","",62],
["f480","",124],
["f540","",62],
["f580","",124],
["f640","",62],
["f680","",124],
["f740","",62],
["f780","",124],
["f840","",62],
["f880","",124],
["f940",""],
["fa40","ⅰ",9,"Ⅰ",9,"￢￤＇＂㈱№℡∵纊褜鍈銈蓜俉炻昱棈鋹曻彅丨仡仼伀伃伹佖侒侊侚侔俍偀倢俿倞偆偰偂傔僴僘兊"],
["fa80","兤冝冾凬刕劜劦勀勛匀匇匤卲厓厲叝﨎咜咊咩哿喆坙坥垬埈埇﨏塚增墲夋奓奛奝奣妤妺孖寀甯寘寬尞岦岺峵崧嵓﨑嵂嵭嶸嶹巐弡弴彧德忞恝悅悊惞惕愠惲愑愷愰憘戓抦揵摠撝擎敎昀昕昻昉昮昞昤晥晗晙晴晳暙暠暲暿曺朎朗杦枻桒柀栁桄棏﨓楨﨔榘槢樰橫橆橳橾櫢櫤毖氿汜沆汯泚洄涇浯"],
["fb40","涖涬淏淸淲淼渹湜渧渼溿澈澵濵瀅瀇瀨炅炫焏焄煜煆煇凞燁燾犱犾猤猪獷玽珉珖珣珒琇珵琦琪琩琮瑢璉璟甁畯皂皜皞皛皦益睆劯砡硎硤硺礰礼神"],
["fb80","祥禔福禛竑竧靖竫箞精絈絜綷綠緖繒罇羡羽茁荢荿菇菶葈蒴蕓蕙蕫﨟薰蘒﨡蠇裵訒訷詹誧誾諟諸諶譓譿賰賴贒赶﨣軏﨤逸遧郞都鄕鄧釚釗釞釭釮釤釥鈆鈐鈊鈺鉀鈼鉎鉙鉑鈹鉧銧鉷鉸鋧鋗鋙鋐﨧鋕鋠鋓錥錡鋻﨨錞鋿錝錂鍰鍗鎤鏆鏞鏸鐱鑅鑈閒隆﨩隝隯霳霻靃靍靏靑靕顗顥飯飼餧館馞驎髙"],
["fc40","髜魵魲鮏鮱鮻鰀鵰鵫鶴鸙黑"]
]

},{}],25:[function(require,module,exports){
(function (Buffer){
"use strict"

// == UTF16-BE codec. ==========================================================

exports.utf16be = Utf16BECodec;
function Utf16BECodec() {
}

Utf16BECodec.prototype.encoder = Utf16BEEncoder;
Utf16BECodec.prototype.decoder = Utf16BEDecoder;
Utf16BECodec.prototype.bomAware = true;


// -- Encoding

function Utf16BEEncoder() {
}

Utf16BEEncoder.prototype.write = function(str) {
    var buf = new Buffer(str, 'ucs2');
    for (var i = 0; i < buf.length; i += 2) {
        var tmp = buf[i]; buf[i] = buf[i+1]; buf[i+1] = tmp;
    }
    return buf;
}

Utf16BEEncoder.prototype.end = function() {
}


// -- Decoding

function Utf16BEDecoder() {
    this.overflowByte = -1;
}

Utf16BEDecoder.prototype.write = function(buf) {
    if (buf.length == 0)
        return '';

    var buf2 = new Buffer(buf.length + 1),
        i = 0, j = 0;

    if (this.overflowByte !== -1) {
        buf2[0] = buf[0];
        buf2[1] = this.overflowByte;
        i = 1; j = 2;
    }

    for (; i < buf.length-1; i += 2, j+= 2) {
        buf2[j] = buf[i+1];
        buf2[j+1] = buf[i];
    }

    this.overflowByte = (i == buf.length-1) ? buf[buf.length-1] : -1;

    return buf2.slice(0, j).toString('ucs2');
}

Utf16BEDecoder.prototype.end = function() {
}


// == UTF-16 codec =============================================================
// Decoder chooses automatically from UTF-16LE and UTF-16BE using BOM and space-based heuristic.
// Defaults to UTF-16LE, as it's prevalent and default in Node.
// http://en.wikipedia.org/wiki/UTF-16 and http://encoding.spec.whatwg.org/#utf-16le
// Decoder default can be changed: iconv.decode(buf, 'utf16', {defaultEncoding: 'utf-16be'});

// Encoder uses UTF-16LE and prepends BOM (which can be overridden with addBOM: false).

exports.utf16 = Utf16Codec;
function Utf16Codec(codecOptions, iconv) {
    this.iconv = iconv;
}

Utf16Codec.prototype.encoder = Utf16Encoder;
Utf16Codec.prototype.decoder = Utf16Decoder;


// -- Encoding (pass-through)

function Utf16Encoder(options, codec) {
    options = options || {};
    if (options.addBOM === undefined)
        options.addBOM = true;
    this.encoder = codec.iconv.getEncoder('utf-16le', options);
}

Utf16Encoder.prototype.write = function(str) {
    return this.encoder.write(str);
}

Utf16Encoder.prototype.end = function() {
    return this.encoder.end();
}


// -- Decoding

function Utf16Decoder(options, codec) {
    this.decoder = null;
    this.initialBytes = [];
    this.initialBytesLen = 0;

    this.options = options || {};
    this.iconv = codec.iconv;
}

Utf16Decoder.prototype.write = function(buf) {
    if (!this.decoder) {
        // Codec is not chosen yet. Accumulate initial bytes.
        this.initialBytes.push(buf);
        this.initialBytesLen += buf.length;
        
        if (this.initialBytesLen < 16) // We need more bytes to use space heuristic (see below)
            return '';

        // We have enough bytes -> detect endianness.
        var buf = Buffer.concat(this.initialBytes),
            encoding = detectEncoding(buf, this.options.defaultEncoding);
        this.decoder = this.iconv.getDecoder(encoding, this.options);
        this.initialBytes.length = this.initialBytesLen = 0;
    }

    return this.decoder.write(buf);
}

Utf16Decoder.prototype.end = function() {
    if (!this.decoder) {
        var buf = Buffer.concat(this.initialBytes),
            encoding = detectEncoding(buf, this.options.defaultEncoding);
        this.decoder = this.iconv.getDecoder(encoding, this.options);

        var res = this.decoder.write(buf),
            trail = this.decoder.end();

        return trail ? (res + trail) : res;
    }
    return this.decoder.end();
}

function detectEncoding(buf, defaultEncoding) {
    var enc = defaultEncoding || 'utf-16le';

    if (buf.length >= 2) {
        // Check BOM.
        if (buf[0] == 0xFE && buf[1] == 0xFF) // UTF-16BE BOM
            enc = 'utf-16be';
        else if (buf[0] == 0xFF && buf[1] == 0xFE) // UTF-16LE BOM
            enc = 'utf-16le';
        else {
            // No BOM found. Try to deduce encoding from initial content.
            // Most of the time, the content has ASCII chars (U+00**), but the opposite (U+**00) is uncommon.
            // So, we count ASCII as if it was LE or BE, and decide from that.
            var asciiCharsLE = 0, asciiCharsBE = 0, // Counts of chars in both positions
                _len = Math.min(buf.length - (buf.length % 2), 64); // Len is always even.

            for (var i = 0; i < _len; i += 2) {
                if (buf[i] === 0 && buf[i+1] !== 0) asciiCharsBE++;
                if (buf[i] !== 0 && buf[i+1] === 0) asciiCharsLE++;
            }

            if (asciiCharsBE > asciiCharsLE)
                enc = 'utf-16be';
            else if (asciiCharsBE < asciiCharsLE)
                enc = 'utf-16le';
        }
    }

    return enc;
}



}).call(this,require("buffer").Buffer)
},{"buffer":5}],26:[function(require,module,exports){
(function (Buffer){
"use strict"

// UTF-7 codec, according to https://tools.ietf.org/html/rfc2152
// See also below a UTF-7-IMAP codec, according to http://tools.ietf.org/html/rfc3501#section-5.1.3

exports.utf7 = Utf7Codec;
exports.unicode11utf7 = 'utf7'; // Alias UNICODE-1-1-UTF-7
function Utf7Codec(codecOptions, iconv) {
    this.iconv = iconv;
};

Utf7Codec.prototype.encoder = Utf7Encoder;
Utf7Codec.prototype.decoder = Utf7Decoder;
Utf7Codec.prototype.bomAware = true;


// -- Encoding

var nonDirectChars = /[^A-Za-z0-9'\(\),-\.\/:\? \n\r\t]+/g;

function Utf7Encoder(options, codec) {
    this.iconv = codec.iconv;
}

Utf7Encoder.prototype.write = function(str) {
    // Naive implementation.
    // Non-direct chars are encoded as "+<base64>-"; single "+" char is encoded as "+-".
    return new Buffer(str.replace(nonDirectChars, function(chunk) {
        return "+" + (chunk === '+' ? '' : 
            this.iconv.encode(chunk, 'utf16-be').toString('base64').replace(/=+$/, '')) 
            + "-";
    }.bind(this)));
}

Utf7Encoder.prototype.end = function() {
}


// -- Decoding

function Utf7Decoder(options, codec) {
    this.iconv = codec.iconv;
    this.inBase64 = false;
    this.base64Accum = '';
}

var base64Regex = /[A-Za-z0-9\/+]/;
var base64Chars = [];
for (var i = 0; i < 256; i++)
    base64Chars[i] = base64Regex.test(String.fromCharCode(i));

var plusChar = '+'.charCodeAt(0), 
    minusChar = '-'.charCodeAt(0),
    andChar = '&'.charCodeAt(0);

Utf7Decoder.prototype.write = function(buf) {
    var res = "", lastI = 0,
        inBase64 = this.inBase64,
        base64Accum = this.base64Accum;

    // The decoder is more involved as we must handle chunks in stream.

    for (var i = 0; i < buf.length; i++) {
        if (!inBase64) { // We're in direct mode.
            // Write direct chars until '+'
            if (buf[i] == plusChar) {
                res += this.iconv.decode(buf.slice(lastI, i), "ascii"); // Write direct chars.
                lastI = i+1;
                inBase64 = true;
            }
        } else { // We decode base64.
            if (!base64Chars[buf[i]]) { // Base64 ended.
                if (i == lastI && buf[i] == minusChar) {// "+-" -> "+"
                    res += "+";
                } else {
                    var b64str = base64Accum + buf.slice(lastI, i).toString();
                    res += this.iconv.decode(new Buffer(b64str, 'base64'), "utf16-be");
                }

                if (buf[i] != minusChar) // Minus is absorbed after base64.
                    i--;

                lastI = i+1;
                inBase64 = false;
                base64Accum = '';
            }
        }
    }

    if (!inBase64) {
        res += this.iconv.decode(buf.slice(lastI), "ascii"); // Write direct chars.
    } else {
        var b64str = base64Accum + buf.slice(lastI).toString();

        var canBeDecoded = b64str.length - (b64str.length % 8); // Minimal chunk: 2 quads -> 2x3 bytes -> 3 chars.
        base64Accum = b64str.slice(canBeDecoded); // The rest will be decoded in future.
        b64str = b64str.slice(0, canBeDecoded);

        res += this.iconv.decode(new Buffer(b64str, 'base64'), "utf16-be");
    }

    this.inBase64 = inBase64;
    this.base64Accum = base64Accum;

    return res;
}

Utf7Decoder.prototype.end = function() {
    var res = "";
    if (this.inBase64 && this.base64Accum.length > 0)
        res = this.iconv.decode(new Buffer(this.base64Accum, 'base64'), "utf16-be");

    this.inBase64 = false;
    this.base64Accum = '';
    return res;
}


// UTF-7-IMAP codec.
// RFC3501 Sec. 5.1.3 Modified UTF-7 (http://tools.ietf.org/html/rfc3501#section-5.1.3)
// Differences:
//  * Base64 part is started by "&" instead of "+"
//  * Direct characters are 0x20-0x7E, except "&" (0x26)
//  * In Base64, "," is used instead of "/"
//  * Base64 must not be used to represent direct characters.
//  * No implicit shift back from Base64 (should always end with '-')
//  * String must end in non-shifted position.
//  * "-&" while in base64 is not allowed.


exports.utf7imap = Utf7IMAPCodec;
function Utf7IMAPCodec(codecOptions, iconv) {
    this.iconv = iconv;
};

Utf7IMAPCodec.prototype.encoder = Utf7IMAPEncoder;
Utf7IMAPCodec.prototype.decoder = Utf7IMAPDecoder;
Utf7IMAPCodec.prototype.bomAware = true;


// -- Encoding

function Utf7IMAPEncoder(options, codec) {
    this.iconv = codec.iconv;
    this.inBase64 = false;
    this.base64Accum = new Buffer(6);
    this.base64AccumIdx = 0;
}

Utf7IMAPEncoder.prototype.write = function(str) {
    var inBase64 = this.inBase64,
        base64Accum = this.base64Accum,
        base64AccumIdx = this.base64AccumIdx,
        buf = new Buffer(str.length*5 + 10), bufIdx = 0;

    for (var i = 0; i < str.length; i++) {
        var uChar = str.charCodeAt(i);
        if (0x20 <= uChar && uChar <= 0x7E) { // Direct character or '&'.
            if (inBase64) {
                if (base64AccumIdx > 0) {
                    bufIdx += buf.write(base64Accum.slice(0, base64AccumIdx).toString('base64').replace(/\//g, ',').replace(/=+$/, ''), bufIdx);
                    base64AccumIdx = 0;
                }

                buf[bufIdx++] = minusChar; // Write '-', then go to direct mode.
                inBase64 = false;
            }

            if (!inBase64) {
                buf[bufIdx++] = uChar; // Write direct character

                if (uChar === andChar)  // Ampersand -> '&-'
                    buf[bufIdx++] = minusChar;
            }

        } else { // Non-direct character
            if (!inBase64) {
                buf[bufIdx++] = andChar; // Write '&', then go to base64 mode.
                inBase64 = true;
            }
            if (inBase64) {
                base64Accum[base64AccumIdx++] = uChar >> 8;
                base64Accum[base64AccumIdx++] = uChar & 0xFF;

                if (base64AccumIdx == base64Accum.length) {
                    bufIdx += buf.write(base64Accum.toString('base64').replace(/\//g, ','), bufIdx);
                    base64AccumIdx = 0;
                }
            }
        }
    }

    this.inBase64 = inBase64;
    this.base64AccumIdx = base64AccumIdx;

    return buf.slice(0, bufIdx);
}

Utf7IMAPEncoder.prototype.end = function() {
    var buf = new Buffer(10), bufIdx = 0;
    if (this.inBase64) {
        if (this.base64AccumIdx > 0) {
            bufIdx += buf.write(this.base64Accum.slice(0, this.base64AccumIdx).toString('base64').replace(/\//g, ',').replace(/=+$/, ''), bufIdx);
            this.base64AccumIdx = 0;
        }

        buf[bufIdx++] = minusChar; // Write '-', then go to direct mode.
        this.inBase64 = false;
    }

    return buf.slice(0, bufIdx);
}


// -- Decoding

function Utf7IMAPDecoder(options, codec) {
    this.iconv = codec.iconv;
    this.inBase64 = false;
    this.base64Accum = '';
}

var base64IMAPChars = base64Chars.slice();
base64IMAPChars[','.charCodeAt(0)] = true;

Utf7IMAPDecoder.prototype.write = function(buf) {
    var res = "", lastI = 0,
        inBase64 = this.inBase64,
        base64Accum = this.base64Accum;

    // The decoder is more involved as we must handle chunks in stream.
    // It is forgiving, closer to standard UTF-7 (for example, '-' is optional at the end).

    for (var i = 0; i < buf.length; i++) {
        if (!inBase64) { // We're in direct mode.
            // Write direct chars until '&'
            if (buf[i] == andChar) {
                res += this.iconv.decode(buf.slice(lastI, i), "ascii"); // Write direct chars.
                lastI = i+1;
                inBase64 = true;
            }
        } else { // We decode base64.
            if (!base64IMAPChars[buf[i]]) { // Base64 ended.
                if (i == lastI && buf[i] == minusChar) { // "&-" -> "&"
                    res += "&";
                } else {
                    var b64str = base64Accum + buf.slice(lastI, i).toString().replace(/,/g, '/');
                    res += this.iconv.decode(new Buffer(b64str, 'base64'), "utf16-be");
                }

                if (buf[i] != minusChar) // Minus may be absorbed after base64.
                    i--;

                lastI = i+1;
                inBase64 = false;
                base64Accum = '';
            }
        }
    }

    if (!inBase64) {
        res += this.iconv.decode(buf.slice(lastI), "ascii"); // Write direct chars.
    } else {
        var b64str = base64Accum + buf.slice(lastI).toString().replace(/,/g, '/');

        var canBeDecoded = b64str.length - (b64str.length % 8); // Minimal chunk: 2 quads -> 2x3 bytes -> 3 chars.
        base64Accum = b64str.slice(canBeDecoded); // The rest will be decoded in future.
        b64str = b64str.slice(0, canBeDecoded);

        res += this.iconv.decode(new Buffer(b64str, 'base64'), "utf16-be");
    }

    this.inBase64 = inBase64;
    this.base64Accum = base64Accum;

    return res;
}

Utf7IMAPDecoder.prototype.end = function() {
    var res = "";
    if (this.inBase64 && this.base64Accum.length > 0)
        res = this.iconv.decode(new Buffer(this.base64Accum, 'base64'), "utf16-be");

    this.inBase64 = false;
    this.base64Accum = '';
    return res;
}



}).call(this,require("buffer").Buffer)
},{"buffer":5}],27:[function(require,module,exports){
"use strict"

var BOMChar = '\uFEFF';

exports.PrependBOM = PrependBOMWrapper
function PrependBOMWrapper(encoder, options) {
    this.encoder = encoder;
    this.addBOM = true;
}

PrependBOMWrapper.prototype.write = function(str) {
    if (this.addBOM) {
        str = BOMChar + str;
        this.addBOM = false;
    }

    return this.encoder.write(str);
}

PrependBOMWrapper.prototype.end = function() {
    return this.encoder.end();
}


//------------------------------------------------------------------------------

exports.StripBOM = StripBOMWrapper;
function StripBOMWrapper(decoder, options) {
    this.decoder = decoder;
    this.pass = false;
    this.options = options || {};
}

StripBOMWrapper.prototype.write = function(buf) {
    var res = this.decoder.write(buf);
    if (this.pass || !res)
        return res;

    if (res[0] === BOMChar) {
        res = res.slice(1);
        if (typeof this.options.stripBOM === 'function')
            this.options.stripBOM();
    }

    this.pass = true;
    return res;
}

StripBOMWrapper.prototype.end = function() {
    return this.decoder.end();
}


},{}],28:[function(require,module,exports){
(function (Buffer){
"use strict"

// == Extend Node primitives to use iconv-lite =================================

module.exports = function (iconv) {
    var original = undefined; // Place to keep original methods.

    // Node authors rewrote Buffer internals to make it compatible with
    // Uint8Array and we cannot patch key functions since then.
    iconv.supportsNodeEncodingsExtension = !(new Buffer(0) instanceof Uint8Array);

    iconv.extendNodeEncodings = function extendNodeEncodings() {
        if (original) return;
        original = {};

        if (!iconv.supportsNodeEncodingsExtension) {
            console.error("ACTION NEEDED: require('iconv-lite').extendNodeEncodings() is not supported in your version of Node");
            console.error("See more info at https://github.com/ashtuchkin/iconv-lite/wiki/Node-v4-compatibility");
            return;
        }

        var nodeNativeEncodings = {
            'hex': true, 'utf8': true, 'utf-8': true, 'ascii': true, 'binary': true, 
            'base64': true, 'ucs2': true, 'ucs-2': true, 'utf16le': true, 'utf-16le': true,
        };

        Buffer.isNativeEncoding = function(enc) {
            return enc && nodeNativeEncodings[enc.toLowerCase()];
        }

        // -- SlowBuffer -----------------------------------------------------------
        var SlowBuffer = require('buffer').SlowBuffer;

        original.SlowBufferToString = SlowBuffer.prototype.toString;
        SlowBuffer.prototype.toString = function(encoding, start, end) {
            encoding = String(encoding || 'utf8').toLowerCase();

            // Use native conversion when possible
            if (Buffer.isNativeEncoding(encoding))
                return original.SlowBufferToString.call(this, encoding, start, end);

            // Otherwise, use our decoding method.
            if (typeof start == 'undefined') start = 0;
            if (typeof end == 'undefined') end = this.length;
            return iconv.decode(this.slice(start, end), encoding);
        }

        original.SlowBufferWrite = SlowBuffer.prototype.write;
        SlowBuffer.prototype.write = function(string, offset, length, encoding) {
            // Support both (string, offset, length, encoding)
            // and the legacy (string, encoding, offset, length)
            if (isFinite(offset)) {
                if (!isFinite(length)) {
                    encoding = length;
                    length = undefined;
                }
            } else {  // legacy
                var swap = encoding;
                encoding = offset;
                offset = length;
                length = swap;
            }

            offset = +offset || 0;
            var remaining = this.length - offset;
            if (!length) {
                length = remaining;
            } else {
                length = +length;
                if (length > remaining) {
                    length = remaining;
                }
            }
            encoding = String(encoding || 'utf8').toLowerCase();

            // Use native conversion when possible
            if (Buffer.isNativeEncoding(encoding))
                return original.SlowBufferWrite.call(this, string, offset, length, encoding);

            if (string.length > 0 && (length < 0 || offset < 0))
                throw new RangeError('attempt to write beyond buffer bounds');

            // Otherwise, use our encoding method.
            var buf = iconv.encode(string, encoding);
            if (buf.length < length) length = buf.length;
            buf.copy(this, offset, 0, length);
            return length;
        }

        // -- Buffer ---------------------------------------------------------------

        original.BufferIsEncoding = Buffer.isEncoding;
        Buffer.isEncoding = function(encoding) {
            return Buffer.isNativeEncoding(encoding) || iconv.encodingExists(encoding);
        }

        original.BufferByteLength = Buffer.byteLength;
        Buffer.byteLength = SlowBuffer.byteLength = function(str, encoding) {
            encoding = String(encoding || 'utf8').toLowerCase();

            // Use native conversion when possible
            if (Buffer.isNativeEncoding(encoding))
                return original.BufferByteLength.call(this, str, encoding);

            // Slow, I know, but we don't have a better way yet.
            return iconv.encode(str, encoding).length;
        }

        original.BufferToString = Buffer.prototype.toString;
        Buffer.prototype.toString = function(encoding, start, end) {
            encoding = String(encoding || 'utf8').toLowerCase();

            // Use native conversion when possible
            if (Buffer.isNativeEncoding(encoding))
                return original.BufferToString.call(this, encoding, start, end);

            // Otherwise, use our decoding method.
            if (typeof start == 'undefined') start = 0;
            if (typeof end == 'undefined') end = this.length;
            return iconv.decode(this.slice(start, end), encoding);
        }

        original.BufferWrite = Buffer.prototype.write;
        Buffer.prototype.write = function(string, offset, length, encoding) {
            var _offset = offset, _length = length, _encoding = encoding;
            // Support both (string, offset, length, encoding)
            // and the legacy (string, encoding, offset, length)
            if (isFinite(offset)) {
                if (!isFinite(length)) {
                    encoding = length;
                    length = undefined;
                }
            } else {  // legacy
                var swap = encoding;
                encoding = offset;
                offset = length;
                length = swap;
            }

            encoding = String(encoding || 'utf8').toLowerCase();

            // Use native conversion when possible
            if (Buffer.isNativeEncoding(encoding))
                return original.BufferWrite.call(this, string, _offset, _length, _encoding);

            offset = +offset || 0;
            var remaining = this.length - offset;
            if (!length) {
                length = remaining;
            } else {
                length = +length;
                if (length > remaining) {
                    length = remaining;
                }
            }

            if (string.length > 0 && (length < 0 || offset < 0))
                throw new RangeError('attempt to write beyond buffer bounds');

            // Otherwise, use our encoding method.
            var buf = iconv.encode(string, encoding);
            if (buf.length < length) length = buf.length;
            buf.copy(this, offset, 0, length);
            return length;

            // TODO: Set _charsWritten.
        }


        // -- Readable -------------------------------------------------------------
        if (iconv.supportsStreams) {
            var Readable = require('stream').Readable;

            original.ReadableSetEncoding = Readable.prototype.setEncoding;
            Readable.prototype.setEncoding = function setEncoding(enc, options) {
                // Use our own decoder, it has the same interface.
                // We cannot use original function as it doesn't handle BOM-s.
                this._readableState.decoder = iconv.getDecoder(enc, options);
                this._readableState.encoding = enc;
            }

            Readable.prototype.collect = iconv._collect;
        }
    }

    // Remove iconv-lite Node primitive extensions.
    iconv.undoExtendNodeEncodings = function undoExtendNodeEncodings() {
        if (!iconv.supportsNodeEncodingsExtension)
            return;
        if (!original)
            throw new Error("require('iconv-lite').undoExtendNodeEncodings(): Nothing to undo; extendNodeEncodings() is not called.")

        delete Buffer.isNativeEncoding;

        var SlowBuffer = require('buffer').SlowBuffer;

        SlowBuffer.prototype.toString = original.SlowBufferToString;
        SlowBuffer.prototype.write = original.SlowBufferWrite;

        Buffer.isEncoding = original.BufferIsEncoding;
        Buffer.byteLength = original.BufferByteLength;
        Buffer.prototype.toString = original.BufferToString;
        Buffer.prototype.write = original.BufferWrite;

        if (iconv.supportsStreams) {
            var Readable = require('stream').Readable;

            Readable.prototype.setEncoding = original.ReadableSetEncoding;
            delete Readable.prototype.collect;
        }

        original = undefined;
    }
}

}).call(this,require("buffer").Buffer)
},{"buffer":5,"stream":57}],29:[function(require,module,exports){
(function (process,Buffer){
"use strict"

var bomHandling = require('./bom-handling'),
    iconv = module.exports;

// All codecs and aliases are kept here, keyed by encoding name/alias.
// They are lazy loaded in `iconv.getCodec` from `encodings/index.js`.
iconv.encodings = null;

// Characters emitted in case of error.
iconv.defaultCharUnicode = '�';
iconv.defaultCharSingleByte = '?';

// Public API.
iconv.encode = function encode(str, encoding, options) {
    str = "" + (str || ""); // Ensure string.

    var encoder = iconv.getEncoder(encoding, options);

    var res = encoder.write(str);
    var trail = encoder.end();
    
    return (trail && trail.length > 0) ? Buffer.concat([res, trail]) : res;
}

iconv.decode = function decode(buf, encoding, options) {
    if (typeof buf === 'string') {
        if (!iconv.skipDecodeWarning) {
            console.error('Iconv-lite warning: decode()-ing strings is deprecated. Refer to https://github.com/ashtuchkin/iconv-lite/wiki/Use-Buffers-when-decoding');
            iconv.skipDecodeWarning = true;
        }

        buf = new Buffer("" + (buf || ""), "binary"); // Ensure buffer.
    }

    var decoder = iconv.getDecoder(encoding, options);

    var res = decoder.write(buf);
    var trail = decoder.end();

    return trail ? (res + trail) : res;
}

iconv.encodingExists = function encodingExists(enc) {
    try {
        iconv.getCodec(enc);
        return true;
    } catch (e) {
        return false;
    }
}

// Legacy aliases to convert functions
iconv.toEncoding = iconv.encode;
iconv.fromEncoding = iconv.decode;

// Search for a codec in iconv.encodings. Cache codec data in iconv._codecDataCache.
iconv._codecDataCache = {};
iconv.getCodec = function getCodec(encoding) {
    if (!iconv.encodings)
        iconv.encodings = require("../encodings"); // Lazy load all encoding definitions.
    
    // Canonicalize encoding name: strip all non-alphanumeric chars and appended year.
    var enc = (''+encoding).toLowerCase().replace(/[^0-9a-z]|:\d{4}$/g, "");

    // Traverse iconv.encodings to find actual codec.
    var codecOptions = {};
    while (true) {
        var codec = iconv._codecDataCache[enc];
        if (codec)
            return codec;

        var codecDef = iconv.encodings[enc];

        switch (typeof codecDef) {
            case "string": // Direct alias to other encoding.
                enc = codecDef;
                break;

            case "object": // Alias with options. Can be layered.
                for (var key in codecDef)
                    codecOptions[key] = codecDef[key];

                if (!codecOptions.encodingName)
                    codecOptions.encodingName = enc;
                
                enc = codecDef.type;
                break;

            case "function": // Codec itself.
                if (!codecOptions.encodingName)
                    codecOptions.encodingName = enc;

                // The codec function must load all tables and return object with .encoder and .decoder methods.
                // It'll be called only once (for each different options object).
                codec = new codecDef(codecOptions, iconv);

                iconv._codecDataCache[codecOptions.encodingName] = codec; // Save it to be reused later.
                return codec;

            default:
                throw new Error("Encoding not recognized: '" + encoding + "' (searched as: '"+enc+"')");
        }
    }
}

iconv.getEncoder = function getEncoder(encoding, options) {
    var codec = iconv.getCodec(encoding),
        encoder = new codec.encoder(options, codec);

    if (codec.bomAware && options && options.addBOM)
        encoder = new bomHandling.PrependBOM(encoder, options);

    return encoder;
}

iconv.getDecoder = function getDecoder(encoding, options) {
    var codec = iconv.getCodec(encoding),
        decoder = new codec.decoder(options, codec);

    if (codec.bomAware && !(options && options.stripBOM === false))
        decoder = new bomHandling.StripBOM(decoder, options);

    return decoder;
}


// Load extensions in Node. All of them are omitted in Browserify build via 'browser' field in package.json.
var nodeVer = typeof process !== 'undefined' && process.versions && process.versions.node;
if (nodeVer) {

    // Load streaming support in Node v0.10+
    var nodeVerArr = nodeVer.split(".").map(Number);
    if (nodeVerArr[0] > 0 || nodeVerArr[1] >= 10) {
        require("./streams")(iconv);
    }

    // Load Node primitive extensions.
    require("./extend-node")(iconv);
}


}).call(this,require('_process'),require("buffer").Buffer)
},{"../encodings":12,"./bom-handling":27,"./extend-node":28,"./streams":30,"_process":36,"buffer":5}],30:[function(require,module,exports){
(function (Buffer){
"use strict"

var Transform = require("stream").Transform;


// == Exports ==================================================================
module.exports = function(iconv) {
    
    // Additional Public API.
    iconv.encodeStream = function encodeStream(encoding, options) {
        return new IconvLiteEncoderStream(iconv.getEncoder(encoding, options), options);
    }

    iconv.decodeStream = function decodeStream(encoding, options) {
        return new IconvLiteDecoderStream(iconv.getDecoder(encoding, options), options);
    }

    iconv.supportsStreams = true;


    // Not published yet.
    iconv.IconvLiteEncoderStream = IconvLiteEncoderStream;
    iconv.IconvLiteDecoderStream = IconvLiteDecoderStream;
    iconv._collect = IconvLiteDecoderStream.prototype.collect;
};


// == Encoder stream =======================================================
function IconvLiteEncoderStream(conv, options) {
    this.conv = conv;
    options = options || {};
    options.decodeStrings = false; // We accept only strings, so we don't need to decode them.
    Transform.call(this, options);
}

IconvLiteEncoderStream.prototype = Object.create(Transform.prototype, {
    constructor: { value: IconvLiteEncoderStream }
});

IconvLiteEncoderStream.prototype._transform = function(chunk, encoding, done) {
    if (typeof chunk != 'string')
        return done(new Error("Iconv encoding stream needs strings as its input."));
    try {
        var res = this.conv.write(chunk);
        if (res && res.length) this.push(res);
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteEncoderStream.prototype._flush = function(done) {
    try {
        var res = this.conv.end();
        if (res && res.length) this.push(res);
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteEncoderStream.prototype.collect = function(cb) {
    var chunks = [];
    this.on('error', cb);
    this.on('data', function(chunk) { chunks.push(chunk); });
    this.on('end', function() {
        cb(null, Buffer.concat(chunks));
    });
    return this;
}


// == Decoder stream =======================================================
function IconvLiteDecoderStream(conv, options) {
    this.conv = conv;
    options = options || {};
    options.encoding = this.encoding = 'utf8'; // We output strings.
    Transform.call(this, options);
}

IconvLiteDecoderStream.prototype = Object.create(Transform.prototype, {
    constructor: { value: IconvLiteDecoderStream }
});

IconvLiteDecoderStream.prototype._transform = function(chunk, encoding, done) {
    if (!Buffer.isBuffer(chunk))
        return done(new Error("Iconv decoding stream needs buffers as its input."));
    try {
        var res = this.conv.write(chunk);
        if (res && res.length) this.push(res, this.encoding);
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteDecoderStream.prototype._flush = function(done) {
    try {
        var res = this.conv.end();
        if (res && res.length) this.push(res, this.encoding);                
        done();
    }
    catch (e) {
        done(e);
    }
}

IconvLiteDecoderStream.prototype.collect = function(cb) {
    var res = '';
    this.on('error', cb);
    this.on('data', function(chunk) { res += chunk; });
    this.on('end', function() {
        cb(null, res);
    });
    return this;
}


}).call(this,require("buffer").Buffer)
},{"buffer":5,"stream":57}],31:[function(require,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],32:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],33:[function(require,module,exports){
/**
 * Determine if an object is Buffer
 *
 * Author:   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * License:  MIT
 *
 * `npm install is-buffer`
 */

module.exports = function (obj) {
  return !!(obj != null &&
    (obj._isBuffer || // For Safari 5-7 (missing Object.prototype.constructor)
      (obj.constructor &&
      typeof obj.constructor.isBuffer === 'function' &&
      obj.constructor.isBuffer(obj))
    ))
}

},{}],34:[function(require,module,exports){
(function (process){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
function normalizeArray(parts, allowAboveRoot) {
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = parts.length - 1; i >= 0; i--) {
    var last = parts[i];
    if (last === '.') {
      parts.splice(i, 1);
    } else if (last === '..') {
      parts.splice(i, 1);
      up++;
    } else if (up) {
      parts.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (allowAboveRoot) {
    for (; up--; up) {
      parts.unshift('..');
    }
  }

  return parts;
}

// Split a filename into [root, dir, basename, ext], unix version
// 'root' is just a slash, or nothing.
var splitPathRe =
    /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
var splitPath = function(filename) {
  return splitPathRe.exec(filename).slice(1);
};

// path.resolve([from ...], to)
// posix version
exports.resolve = function() {
  var resolvedPath = '',
      resolvedAbsolute = false;

  for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
    var path = (i >= 0) ? arguments[i] : process.cwd();

    // Skip empty and invalid entries
    if (typeof path !== 'string') {
      throw new TypeError('Arguments to path.resolve must be strings');
    } else if (!path) {
      continue;
    }

    resolvedPath = path + '/' + resolvedPath;
    resolvedAbsolute = path.charAt(0) === '/';
  }

  // At this point the path should be resolved to a full absolute path, but
  // handle relative paths to be safe (might happen when process.cwd() fails)

  // Normalize the path
  resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
    return !!p;
  }), !resolvedAbsolute).join('/');

  return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
};

// path.normalize(path)
// posix version
exports.normalize = function(path) {
  var isAbsolute = exports.isAbsolute(path),
      trailingSlash = substr(path, -1) === '/';

  // Normalize the path
  path = normalizeArray(filter(path.split('/'), function(p) {
    return !!p;
  }), !isAbsolute).join('/');

  if (!path && !isAbsolute) {
    path = '.';
  }
  if (path && trailingSlash) {
    path += '/';
  }

  return (isAbsolute ? '/' : '') + path;
};

// posix version
exports.isAbsolute = function(path) {
  return path.charAt(0) === '/';
};

// posix version
exports.join = function() {
  var paths = Array.prototype.slice.call(arguments, 0);
  return exports.normalize(filter(paths, function(p, index) {
    if (typeof p !== 'string') {
      throw new TypeError('Arguments to path.join must be strings');
    }
    return p;
  }).join('/'));
};


// path.relative(from, to)
// posix version
exports.relative = function(from, to) {
  from = exports.resolve(from).substr(1);
  to = exports.resolve(to).substr(1);

  function trim(arr) {
    var start = 0;
    for (; start < arr.length; start++) {
      if (arr[start] !== '') break;
    }

    var end = arr.length - 1;
    for (; end >= 0; end--) {
      if (arr[end] !== '') break;
    }

    if (start > end) return [];
    return arr.slice(start, end - start + 1);
  }

  var fromParts = trim(from.split('/'));
  var toParts = trim(to.split('/'));

  var length = Math.min(fromParts.length, toParts.length);
  var samePartsLength = length;
  for (var i = 0; i < length; i++) {
    if (fromParts[i] !== toParts[i]) {
      samePartsLength = i;
      break;
    }
  }

  var outputParts = [];
  for (var i = samePartsLength; i < fromParts.length; i++) {
    outputParts.push('..');
  }

  outputParts = outputParts.concat(toParts.slice(samePartsLength));

  return outputParts.join('/');
};

exports.sep = '/';
exports.delimiter = ':';

exports.dirname = function(path) {
  var result = splitPath(path),
      root = result[0],
      dir = result[1];

  if (!root && !dir) {
    // No dirname whatsoever
    return '.';
  }

  if (dir) {
    // It has a dirname, strip trailing slash
    dir = dir.substr(0, dir.length - 1);
  }

  return root + dir;
};


exports.basename = function(path, ext) {
  var f = splitPath(path)[2];
  // TODO: make this comparison case-insensitive on windows?
  if (ext && f.substr(-1 * ext.length) === ext) {
    f = f.substr(0, f.length - ext.length);
  }
  return f;
};


exports.extname = function(path) {
  return splitPath(path)[3];
};

function filter (xs, f) {
    if (xs.filter) return xs.filter(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
        if (f(xs[i], i, xs)) res.push(xs[i]);
    }
    return res;
}

// String.prototype.substr - negative index don't work in IE8
var substr = 'ab'.substr(-1) === 'b'
    ? function (str, start, len) { return str.substr(start, len) }
    : function (str, start, len) {
        if (start < 0) start = str.length + start;
        return str.substr(start, len);
    }
;

}).call(this,require('_process'))
},{"_process":36}],35:[function(require,module,exports){
(function (process){
'use strict';

if (!process.version ||
    process.version.indexOf('v0.') === 0 ||
    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
  module.exports = nextTick;
} else {
  module.exports = process.nextTick;
}

function nextTick(fn) {
  var args = new Array(arguments.length - 1);
  var i = 0;
  while (i < args.length) {
    args[i++] = arguments[i];
  }
  process.nextTick(function afterTick() {
    fn.apply(null, args);
  });
}

}).call(this,require('_process'))
},{"_process":36}],36:[function(require,module,exports){
// shim for using process in browser

var process = module.exports = {};
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = setTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    clearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        setTimeout(drainQueue, 0);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],37:[function(require,module,exports){
/*
 (c) 2015, Vladimir Agafonkin
 RBush, a JavaScript library for high-performance 2D spatial indexing of points and rectangles.
 https://github.com/mourner/rbush
*/

(function () {
'use strict';

function rbush(maxEntries, format) {

    // jshint newcap: false, validthis: true
    if (!(this instanceof rbush)) return new rbush(maxEntries, format);

    // max entries in a node is 9 by default; min node fill is 40% for best performance
    this._maxEntries = Math.max(4, maxEntries || 9);
    this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));

    if (format) {
        this._initFormat(format);
    }

    this.clear();
}

rbush.prototype = {

    all: function () {
        return this._all(this.data, []);
    },

    search: function (bbox) {

        var node = this.data,
            result = [],
            toBBox = this.toBBox;

        if (!intersects(bbox, node.bbox)) return result;

        var nodesToSearch = [],
            i, len, child, childBBox;

        while (node) {
            for (i = 0, len = node.children.length; i < len; i++) {

                child = node.children[i];
                childBBox = node.leaf ? toBBox(child) : child.bbox;

                if (intersects(bbox, childBBox)) {
                    if (node.leaf) result.push(child);
                    else if (contains(bbox, childBBox)) this._all(child, result);
                    else nodesToSearch.push(child);
                }
            }
            node = nodesToSearch.pop();
        }

        return result;
    },

    collides: function (bbox) {

        var node = this.data,
            toBBox = this.toBBox;

        if (!intersects(bbox, node.bbox)) return false;

        var nodesToSearch = [],
            i, len, child, childBBox;

        while (node) {
            for (i = 0, len = node.children.length; i < len; i++) {

                child = node.children[i];
                childBBox = node.leaf ? toBBox(child) : child.bbox;

                if (intersects(bbox, childBBox)) {
                    if (node.leaf || contains(bbox, childBBox)) return true;
                    nodesToSearch.push(child);
                }
            }
            node = nodesToSearch.pop();
        }

        return false;
    },

    load: function (data) {
        if (!(data && data.length)) return this;

        if (data.length < this._minEntries) {
            for (var i = 0, len = data.length; i < len; i++) {
                this.insert(data[i]);
            }
            return this;
        }

        // recursively build the tree with the given data from stratch using OMT algorithm
        var node = this._build(data.slice(), 0, data.length - 1, 0);

        if (!this.data.children.length) {
            // save as is if tree is empty
            this.data = node;

        } else if (this.data.height === node.height) {
            // split root if trees have the same height
            this._splitRoot(this.data, node);

        } else {
            if (this.data.height < node.height) {
                // swap trees if inserted one is bigger
                var tmpNode = this.data;
                this.data = node;
                node = tmpNode;
            }

            // insert the small tree into the large tree at appropriate level
            this._insert(node, this.data.height - node.height - 1, true);
        }

        return this;
    },

    insert: function (item) {
        if (item) this._insert(item, this.data.height - 1);
        return this;
    },

    clear: function () {
        this.data = {
            children: [],
            height: 1,
            bbox: empty(),
            leaf: true
        };
        return this;
    },

    remove: function (item) {
        if (!item) return this;

        var node = this.data,
            bbox = this.toBBox(item),
            path = [],
            indexes = [],
            i, parent, index, goingUp;

        // depth-first iterative tree traversal
        while (node || path.length) {

            if (!node) { // go up
                node = path.pop();
                parent = path[path.length - 1];
                i = indexes.pop();
                goingUp = true;
            }

            if (node.leaf) { // check current node
                index = node.children.indexOf(item);

                if (index !== -1) {
                    // item found, remove the item and condense tree upwards
                    node.children.splice(index, 1);
                    path.push(node);
                    this._condense(path);
                    return this;
                }
            }

            if (!goingUp && !node.leaf && contains(node.bbox, bbox)) { // go down
                path.push(node);
                indexes.push(i);
                i = 0;
                parent = node;
                node = node.children[0];

            } else if (parent) { // go right
                i++;
                node = parent.children[i];
                goingUp = false;

            } else node = null; // nothing found
        }

        return this;
    },

    toBBox: function (item) { return item; },

    compareMinX: function (a, b) { return a[0] - b[0]; },
    compareMinY: function (a, b) { return a[1] - b[1]; },

    toJSON: function () { return this.data; },

    fromJSON: function (data) {
        this.data = data;
        return this;
    },

    _all: function (node, result) {
        var nodesToSearch = [];
        while (node) {
            if (node.leaf) result.push.apply(result, node.children);
            else nodesToSearch.push.apply(nodesToSearch, node.children);

            node = nodesToSearch.pop();
        }
        return result;
    },

    _build: function (items, left, right, height) {

        var N = right - left + 1,
            M = this._maxEntries,
            node;

        if (N <= M) {
            // reached leaf level; return leaf
            node = {
                children: items.slice(left, right + 1),
                height: 1,
                bbox: null,
                leaf: true
            };
            calcBBox(node, this.toBBox);
            return node;
        }

        if (!height) {
            // target height of the bulk-loaded tree
            height = Math.ceil(Math.log(N) / Math.log(M));

            // target number of root entries to maximize storage utilization
            M = Math.ceil(N / Math.pow(M, height - 1));
        }

        node = {
            children: [],
            height: height,
            bbox: null,
            leaf: false
        };

        // split the items into M mostly square tiles

        var N2 = Math.ceil(N / M),
            N1 = N2 * Math.ceil(Math.sqrt(M)),
            i, j, right2, right3;

        multiSelect(items, left, right, N1, this.compareMinX);

        for (i = left; i <= right; i += N1) {

            right2 = Math.min(i + N1 - 1, right);

            multiSelect(items, i, right2, N2, this.compareMinY);

            for (j = i; j <= right2; j += N2) {

                right3 = Math.min(j + N2 - 1, right2);

                // pack each entry recursively
                node.children.push(this._build(items, j, right3, height - 1));
            }
        }

        calcBBox(node, this.toBBox);

        return node;
    },

    _chooseSubtree: function (bbox, node, level, path) {

        var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;

        while (true) {
            path.push(node);

            if (node.leaf || path.length - 1 === level) break;

            minArea = minEnlargement = Infinity;

            for (i = 0, len = node.children.length; i < len; i++) {
                child = node.children[i];
                area = bboxArea(child.bbox);
                enlargement = enlargedArea(bbox, child.bbox) - area;

                // choose entry with the least area enlargement
                if (enlargement < minEnlargement) {
                    minEnlargement = enlargement;
                    minArea = area < minArea ? area : minArea;
                    targetNode = child;

                } else if (enlargement === minEnlargement) {
                    // otherwise choose one with the smallest area
                    if (area < minArea) {
                        minArea = area;
                        targetNode = child;
                    }
                }
            }

            node = targetNode;
        }

        return node;
    },

    _insert: function (item, level, isNode) {

        var toBBox = this.toBBox,
            bbox = isNode ? item.bbox : toBBox(item),
            insertPath = [];

        // find the best node for accommodating the item, saving all nodes along the path too
        var node = this._chooseSubtree(bbox, this.data, level, insertPath);

        // put the item into the node
        node.children.push(item);
        extend(node.bbox, bbox);

        // split on node overflow; propagate upwards if necessary
        while (level >= 0) {
            if (insertPath[level].children.length > this._maxEntries) {
                this._split(insertPath, level);
                level--;
            } else break;
        }

        // adjust bboxes along the insertion path
        this._adjustParentBBoxes(bbox, insertPath, level);
    },

    // split overflowed node into two
    _split: function (insertPath, level) {

        var node = insertPath[level],
            M = node.children.length,
            m = this._minEntries;

        this._chooseSplitAxis(node, m, M);

        var splitIndex = this._chooseSplitIndex(node, m, M);

        var newNode = {
            children: node.children.splice(splitIndex, node.children.length - splitIndex),
            height: node.height,
            bbox: null,
            leaf: false
        };

        if (node.leaf) newNode.leaf = true;

        calcBBox(node, this.toBBox);
        calcBBox(newNode, this.toBBox);

        if (level) insertPath[level - 1].children.push(newNode);
        else this._splitRoot(node, newNode);
    },

    _splitRoot: function (node, newNode) {
        // split root node
        this.data = {
            children: [node, newNode],
            height: node.height + 1,
            bbox: null,
            leaf: false
        };
        calcBBox(this.data, this.toBBox);
    },

    _chooseSplitIndex: function (node, m, M) {

        var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;

        minOverlap = minArea = Infinity;

        for (i = m; i <= M - m; i++) {
            bbox1 = distBBox(node, 0, i, this.toBBox);
            bbox2 = distBBox(node, i, M, this.toBBox);

            overlap = intersectionArea(bbox1, bbox2);
            area = bboxArea(bbox1) + bboxArea(bbox2);

            // choose distribution with minimum overlap
            if (overlap < minOverlap) {
                minOverlap = overlap;
                index = i;

                minArea = area < minArea ? area : minArea;

            } else if (overlap === minOverlap) {
                // otherwise choose distribution with minimum area
                if (area < minArea) {
                    minArea = area;
                    index = i;
                }
            }
        }

        return index;
    },

    // sorts node children by the best axis for split
    _chooseSplitAxis: function (node, m, M) {

        var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX,
            compareMinY = node.leaf ? this.compareMinY : compareNodeMinY,
            xMargin = this._allDistMargin(node, m, M, compareMinX),
            yMargin = this._allDistMargin(node, m, M, compareMinY);

        // if total distributions margin value is minimal for x, sort by minX,
        // otherwise it's already sorted by minY
        if (xMargin < yMargin) node.children.sort(compareMinX);
    },

    // total margin of all possible split distributions where each node is at least m full
    _allDistMargin: function (node, m, M, compare) {

        node.children.sort(compare);

        var toBBox = this.toBBox,
            leftBBox = distBBox(node, 0, m, toBBox),
            rightBBox = distBBox(node, M - m, M, toBBox),
            margin = bboxMargin(leftBBox) + bboxMargin(rightBBox),
            i, child;

        for (i = m; i < M - m; i++) {
            child = node.children[i];
            extend(leftBBox, node.leaf ? toBBox(child) : child.bbox);
            margin += bboxMargin(leftBBox);
        }

        for (i = M - m - 1; i >= m; i--) {
            child = node.children[i];
            extend(rightBBox, node.leaf ? toBBox(child) : child.bbox);
            margin += bboxMargin(rightBBox);
        }

        return margin;
    },

    _adjustParentBBoxes: function (bbox, path, level) {
        // adjust bboxes along the given tree path
        for (var i = level; i >= 0; i--) {
            extend(path[i].bbox, bbox);
        }
    },

    _condense: function (path) {
        // go through the path, removing empty nodes and updating bboxes
        for (var i = path.length - 1, siblings; i >= 0; i--) {
            if (path[i].children.length === 0) {
                if (i > 0) {
                    siblings = path[i - 1].children;
                    siblings.splice(siblings.indexOf(path[i]), 1);

                } else this.clear();

            } else calcBBox(path[i], this.toBBox);
        }
    },

    _initFormat: function (format) {
        // data format (minX, minY, maxX, maxY accessors)

        // uses eval-type function compilation instead of just accepting a toBBox function
        // because the algorithms are very sensitive to sorting functions performance,
        // so they should be dead simple and without inner calls

        // jshint evil: true

        var compareArr = ['return a', ' - b', ';'];

        this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));
        this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));

        this.toBBox = new Function('a', 'return [a' + format.join(', a') + '];');
    }
};


// calculate node's bbox from bboxes of its children
function calcBBox(node, toBBox) {
    node.bbox = distBBox(node, 0, node.children.length, toBBox);
}

// min bounding rectangle of node children from k to p-1
function distBBox(node, k, p, toBBox) {
    var bbox = empty();

    for (var i = k, child; i < p; i++) {
        child = node.children[i];
        extend(bbox, node.leaf ? toBBox(child) : child.bbox);
    }

    return bbox;
}

function empty() { return [Infinity, Infinity, -Infinity, -Infinity]; }

function extend(a, b) {
    a[0] = Math.min(a[0], b[0]);
    a[1] = Math.min(a[1], b[1]);
    a[2] = Math.max(a[2], b[2]);
    a[3] = Math.max(a[3], b[3]);
    return a;
}

function compareNodeMinX(a, b) { return a.bbox[0] - b.bbox[0]; }
function compareNodeMinY(a, b) { return a.bbox[1] - b.bbox[1]; }

function bboxArea(a)   { return (a[2] - a[0]) * (a[3] - a[1]); }
function bboxMargin(a) { return (a[2] - a[0]) + (a[3] - a[1]); }

function enlargedArea(a, b) {
    return (Math.max(b[2], a[2]) - Math.min(b[0], a[0])) *
           (Math.max(b[3], a[3]) - Math.min(b[1], a[1]));
}

function intersectionArea(a, b) {
    var minX = Math.max(a[0], b[0]),
        minY = Math.max(a[1], b[1]),
        maxX = Math.min(a[2], b[2]),
        maxY = Math.min(a[3], b[3]);

    return Math.max(0, maxX - minX) *
           Math.max(0, maxY - minY);
}

function contains(a, b) {
    return a[0] <= b[0] &&
           a[1] <= b[1] &&
           b[2] <= a[2] &&
           b[3] <= a[3];
}

function intersects(a, b) {
    return b[0] <= a[2] &&
           b[1] <= a[3] &&
           b[2] >= a[0] &&
           b[3] >= a[1];
}

// sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
// combines selection algorithm with binary divide & conquer approach

function multiSelect(arr, left, right, n, compare) {
    var stack = [left, right],
        mid;

    while (stack.length) {
        right = stack.pop();
        left = stack.pop();

        if (right - left <= n) continue;

        mid = left + Math.ceil((right - left) / n / 2) * n;
        select(arr, left, right, mid, compare);

        stack.push(left, mid, mid, right);
    }
}

// Floyd-Rivest selection algorithm:
// sort an array between left and right (inclusive) so that the smallest k elements come first (unordered)
function select(arr, left, right, k, compare) {
    var n, i, z, s, sd, newLeft, newRight, t, j;

    while (right > left) {
        if (right - left > 600) {
            n = right - left + 1;
            i = k - left + 1;
            z = Math.log(n);
            s = 0.5 * Math.exp(2 * z / 3);
            sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (i - n / 2 < 0 ? -1 : 1);
            newLeft = Math.max(left, Math.floor(k - i * s / n + sd));
            newRight = Math.min(right, Math.floor(k + (n - i) * s / n + sd));
            select(arr, newLeft, newRight, k, compare);
        }

        t = arr[k];
        i = left;
        j = right;

        swap(arr, left, k);
        if (compare(arr[right], t) > 0) swap(arr, left, right);

        while (i < j) {
            swap(arr, i, j);
            i++;
            j--;
            while (compare(arr[i], t) < 0) i++;
            while (compare(arr[j], t) > 0) j--;
        }

        if (compare(arr[left], t) === 0) swap(arr, left, j);
        else {
            j++;
            swap(arr, j, right);
        }

        if (j <= k) left = j + 1;
        if (k <= j) right = j - 1;
    }
}

function swap(arr, i, j) {
    var tmp = arr[i];
    arr[i] = arr[j];
    arr[j] = tmp;
}


// export as AMD/CommonJS module or global variable
if (typeof define === 'function' && define.amd) define('rbush', function () { return rbush; });
else if (typeof module !== 'undefined') module.exports = rbush;
else if (typeof self !== 'undefined') self.rbush = rbush;
else window.rbush = rbush;

})();

},{}],38:[function(require,module,exports){
module.exports = require("./lib/_stream_duplex.js")

},{"./lib/_stream_duplex.js":39}],39:[function(require,module,exports){
// a duplex stream is just a stream that is both readable and writable.
// Since JS doesn't have multiple prototypal inheritance, this class
// prototypally inherits from Readable, and then parasitically from
// Writable.

'use strict';

/*<replacement>*/

var objectKeys = Object.keys || function (obj) {
  var keys = [];
  for (var key in obj) {
    keys.push(key);
  }return keys;
};
/*</replacement>*/

module.exports = Duplex;

/*<replacement>*/
var processNextTick = require('process-nextick-args');
/*</replacement>*/

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

var Readable = require('./_stream_readable');
var Writable = require('./_stream_writable');

util.inherits(Duplex, Readable);

var keys = objectKeys(Writable.prototype);
for (var v = 0; v < keys.length; v++) {
  var method = keys[v];
  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}

function Duplex(options) {
  if (!(this instanceof Duplex)) return new Duplex(options);

  Readable.call(this, options);
  Writable.call(this, options);

  if (options && options.readable === false) this.readable = false;

  if (options && options.writable === false) this.writable = false;

  this.allowHalfOpen = true;
  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;

  this.once('end', onend);
}

// the no-half-open enforcer
function onend() {
  // if we allow half-open state, or if the writable side ended,
  // then we're ok.
  if (this.allowHalfOpen || this._writableState.ended) return;

  // no more data can be written.
  // But allow more writes to happen in this tick.
  processNextTick(onEndNT, this);
}

function onEndNT(self) {
  self.end();
}

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}
},{"./_stream_readable":41,"./_stream_writable":43,"core-util-is":7,"inherits":32,"process-nextick-args":35}],40:[function(require,module,exports){
// a passthrough stream.
// basically just the most minimal sort of Transform stream.
// Every written chunk gets output as-is.

'use strict';

module.exports = PassThrough;

var Transform = require('./_stream_transform');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(PassThrough, Transform);

function PassThrough(options) {
  if (!(this instanceof PassThrough)) return new PassThrough(options);

  Transform.call(this, options);
}

PassThrough.prototype._transform = function (chunk, encoding, cb) {
  cb(null, chunk);
};
},{"./_stream_transform":42,"core-util-is":7,"inherits":32}],41:[function(require,module,exports){
(function (process){
'use strict';

module.exports = Readable;

/*<replacement>*/
var processNextTick = require('process-nextick-args');
/*</replacement>*/

/*<replacement>*/
var isArray = require('isarray');
/*</replacement>*/

/*<replacement>*/
var Buffer = require('buffer').Buffer;
/*</replacement>*/

Readable.ReadableState = ReadableState;

var EE = require('events');

/*<replacement>*/
var EElistenerCount = function (emitter, type) {
  return emitter.listeners(type).length;
};
/*</replacement>*/

/*<replacement>*/
var Stream;
(function () {
  try {
    Stream = require('st' + 'ream');
  } catch (_) {} finally {
    if (!Stream) Stream = require('events').EventEmitter;
  }
})();
/*</replacement>*/

var Buffer = require('buffer').Buffer;

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

/*<replacement>*/
var debugUtil = require('util');
var debug = undefined;
if (debugUtil && debugUtil.debuglog) {
  debug = debugUtil.debuglog('stream');
} else {
  debug = function () {};
}
/*</replacement>*/

var StringDecoder;

util.inherits(Readable, Stream);

var Duplex;
function ReadableState(options, stream) {
  Duplex = Duplex || require('./_stream_duplex');

  options = options || {};

  // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;

  // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = ~ ~this.highWaterMark;

  this.buffer = [];
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = null;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.
  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;
  this.resumeScheduled = false;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // when piping, we only care about 'readable' events that happen
  // after read()ing all the bytes and not getting any pushback.
  this.ranOut = false;

  // the number of writers that are awaiting a drain event in .pipe()s
  this.awaitDrain = 0;

  // if true, a maybeReadMore has been scheduled
  this.readingMore = false;

  this.decoder = null;
  this.encoding = null;
  if (options.encoding) {
    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}

var Duplex;
function Readable(options) {
  Duplex = Duplex || require('./_stream_duplex');

  if (!(this instanceof Readable)) return new Readable(options);

  this._readableState = new ReadableState(options, this);

  // legacy
  this.readable = true;

  if (options && typeof options.read === 'function') this._read = options.read;

  Stream.call(this);
}

// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function (chunk, encoding) {
  var state = this._readableState;

  if (!state.objectMode && typeof chunk === 'string') {
    encoding = encoding || state.defaultEncoding;
    if (encoding !== state.encoding) {
      chunk = new Buffer(chunk, encoding);
      encoding = '';
    }
  }

  return readableAddChunk(this, state, chunk, encoding, false);
};

// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function (chunk) {
  var state = this._readableState;
  return readableAddChunk(this, state, chunk, '', true);
};

Readable.prototype.isPaused = function () {
  return this._readableState.flowing === false;
};

function readableAddChunk(stream, state, chunk, encoding, addToFront) {
  var er = chunkInvalid(state, chunk);
  if (er) {
    stream.emit('error', er);
  } else if (chunk === null) {
    state.reading = false;
    onEofChunk(stream, state);
  } else if (state.objectMode || chunk && chunk.length > 0) {
    if (state.ended && !addToFront) {
      var e = new Error('stream.push() after EOF');
      stream.emit('error', e);
    } else if (state.endEmitted && addToFront) {
      var e = new Error('stream.unshift() after end event');
      stream.emit('error', e);
    } else {
      var skipAdd;
      if (state.decoder && !addToFront && !encoding) {
        chunk = state.decoder.write(chunk);
        skipAdd = !state.objectMode && chunk.length === 0;
      }

      if (!addToFront) state.reading = false;

      // Don't add to the buffer if we've decoded to an empty string chunk and
      // we're not in object mode
      if (!skipAdd) {
        // if we want the data now, just emit it.
        if (state.flowing && state.length === 0 && !state.sync) {
          stream.emit('data', chunk);
          stream.read(0);
        } else {
          // update the buffer info.
          state.length += state.objectMode ? 1 : chunk.length;
          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);

          if (state.needReadable) emitReadable(stream);
        }
      }

      maybeReadMore(stream, state);
    }
  } else if (!addToFront) {
    state.reading = false;
  }

  return needMoreData(state);
}

// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes.  This is to work around cases where hwm=0,
// such as the repl.  Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
}

// backwards compatibility.
Readable.prototype.setEncoding = function (enc) {
  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
  this._readableState.decoder = new StringDecoder(enc);
  this._readableState.encoding = enc;
  return this;
};

// Don't raise the hwm > 8MB
var MAX_HWM = 0x800000;
function computeNewHighWaterMark(n) {
  if (n >= MAX_HWM) {
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }
  return n;
}

function howMuchToRead(n, state) {
  if (state.length === 0 && state.ended) return 0;

  if (state.objectMode) return n === 0 ? 0 : 1;

  if (n === null || isNaN(n)) {
    // only flow one buffer at a time
    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
  }

  if (n <= 0) return 0;

  // If we're asking for more than the target buffer level,
  // then raise the water mark.  Bump up to the next highest
  // power of 2, to prevent increasing it excessively in tiny
  // amounts.
  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);

  // don't have that much.  return null, unless we've ended.
  if (n > state.length) {
    if (!state.ended) {
      state.needReadable = true;
      return 0;
    } else {
      return state.length;
    }
  }

  return n;
}

// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function (n) {
  debug('read', n);
  var state = this._readableState;
  var nOrig = n;

  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;

  // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.
  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
    debug('read: emitReadable', state.length, state.ended);
    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state);

  // if we've ended, and we're now clear, then finish it up.
  if (n === 0 && state.ended) {
    if (state.length === 0) endReadable(this);
    return null;
  }

  // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.

  // if we need a readable event, then we need to do some reading.
  var doRead = state.needReadable;
  debug('need readable', doRead);

  // if we currently have less than the highWaterMark, then also read some
  if (state.length === 0 || state.length - n < state.highWaterMark) {
    doRead = true;
    debug('length less than watermark', doRead);
  }

  // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.
  if (state.ended || state.reading) {
    doRead = false;
    debug('reading or ended', doRead);
  }

  if (doRead) {
    debug('do read');
    state.reading = true;
    state.sync = true;
    // if the length is currently zero, then we *need* a readable event.
    if (state.length === 0) state.needReadable = true;
    // call internal read method
    this._read(state.highWaterMark);
    state.sync = false;
  }

  // If _read pushed data synchronously, then `reading` will be false,
  // and we need to re-evaluate how much data we can return to the user.
  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);

  var ret;
  if (n > 0) ret = fromList(n, state);else ret = null;

  if (ret === null) {
    state.needReadable = true;
    n = 0;
  }

  state.length -= n;

  // If we have nothing in the buffer, then we want to know
  // as soon as we *do* get something into the buffer.
  if (state.length === 0 && !state.ended) state.needReadable = true;

  // If we tried to read() past the EOF, then emit end on the next tick.
  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);

  if (ret !== null) this.emit('data', ret);

  return ret;
};

function chunkInvalid(state, chunk) {
  var er = null;
  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  return er;
}

function onEofChunk(stream, state) {
  if (state.ended) return;
  if (state.decoder) {
    var chunk = state.decoder.end();
    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }
  state.ended = true;

  // emit 'readable' now to make sure it gets picked up.
  emitReadable(stream);
}

// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
  var state = stream._readableState;
  state.needReadable = false;
  if (!state.emittedReadable) {
    debug('emitReadable', state.flowing);
    state.emittedReadable = true;
    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
  }
}

function emitReadable_(stream) {
  debug('emit readable');
  stream.emit('readable');
  flow(stream);
}

// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    processNextTick(maybeReadMore_, stream, state);
  }
}

function maybeReadMore_(stream, state) {
  var len = state.length;
  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
    debug('maybeReadMore read 0');
    stream.read(0);
    if (len === state.length)
      // didn't get any data, stop spinning.
      break;else len = state.length;
  }
  state.readingMore = false;
}

// abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function (n) {
  this.emit('error', new Error('not implemented'));
};

Readable.prototype.pipe = function (dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;
    case 1:
      state.pipes = [state.pipes, dest];
      break;
    default:
      state.pipes.push(dest);
      break;
  }
  state.pipesCount += 1;
  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);

  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;

  var endFn = doEnd ? onend : cleanup;
  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);

  dest.on('unpipe', onunpipe);
  function onunpipe(readable) {
    debug('onunpipe');
    if (readable === src) {
      cleanup();
    }
  }

  function onend() {
    debug('onend');
    dest.end();
  }

  // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.
  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);

  var cleanedUp = false;
  function cleanup() {
    debug('cleanup');
    // cleanup event handlers once the pipe is broken
    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', cleanup);
    src.removeListener('data', ondata);

    cleanedUp = true;

    // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.
    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
  }

  src.on('data', ondata);
  function ondata(chunk) {
    debug('ondata');
    var ret = dest.write(chunk);
    if (false === ret) {
      // If the user unpiped during `dest.write()`, it is possible
      // to get stuck in a permanently paused state if that write
      // also returned false.
      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
        debug('false write response, pause', src._readableState.awaitDrain);
        src._readableState.awaitDrain++;
      }
      src.pause();
    }
  }

  // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.
  function onerror(er) {
    debug('onerror', er);
    unpipe();
    dest.removeListener('error', onerror);
    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
  }
  // This is a brutally ugly hack to make sure that our error handler
  // is attached before any userland ones.  NEVER DO THIS.
  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];

  // Both close and finish should trigger unpipe, but only once.
  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }
  dest.once('close', onclose);
  function onfinish() {
    debug('onfinish');
    dest.removeListener('close', onclose);
    unpipe();
  }
  dest.once('finish', onfinish);

  function unpipe() {
    debug('unpipe');
    src.unpipe(dest);
  }

  // tell the dest that it's being piped to
  dest.emit('pipe', src);

  // start the flow if it hasn't been started already.
  if (!state.flowing) {
    debug('pipe resume');
    src.resume();
  }

  return dest;
};

function pipeOnDrain(src) {
  return function () {
    var state = src._readableState;
    debug('pipeOnDrain', state.awaitDrain);
    if (state.awaitDrain) state.awaitDrain--;
    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
      state.flowing = true;
      flow(src);
    }
  };
}

Readable.prototype.unpipe = function (dest) {
  var state = this._readableState;

  // if we're not piping anywhere, then do nothing.
  if (state.pipesCount === 0) return this;

  // just one destination.  most common case.
  if (state.pipesCount === 1) {
    // passed in one, but it's not the right one.
    if (dest && dest !== state.pipes) return this;

    if (!dest) dest = state.pipes;

    // got a match.
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;
    if (dest) dest.emit('unpipe', this);
    return this;
  }

  // slow case. multiple pipe destinations.

  if (!dest) {
    // remove all.
    var dests = state.pipes;
    var len = state.pipesCount;
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;

    for (var _i = 0; _i < len; _i++) {
      dests[_i].emit('unpipe', this);
    }return this;
  }

  // try to find the right one.
  var i = indexOf(state.pipes, dest);
  if (i === -1) return this;

  state.pipes.splice(i, 1);
  state.pipesCount -= 1;
  if (state.pipesCount === 1) state.pipes = state.pipes[0];

  dest.emit('unpipe', this);

  return this;
};

// set up data events if they are asked for
// Ensure readable listeners eventually get something
Readable.prototype.on = function (ev, fn) {
  var res = Stream.prototype.on.call(this, ev, fn);

  // If listening to data, and it has not explicitly been paused,
  // then call resume to start the flow of data on the next tick.
  if (ev === 'data' && false !== this._readableState.flowing) {
    this.resume();
  }

  if (ev === 'readable' && !this._readableState.endEmitted) {
    var state = this._readableState;
    if (!state.readableListening) {
      state.readableListening = true;
      state.emittedReadable = false;
      state.needReadable = true;
      if (!state.reading) {
        processNextTick(nReadingNextTick, this);
      } else if (state.length) {
        emitReadable(this, state);
      }
    }
  }

  return res;
};
Readable.prototype.addListener = Readable.prototype.on;

function nReadingNextTick(self) {
  debug('readable nexttick read 0');
  self.read(0);
}

// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function () {
  var state = this._readableState;
  if (!state.flowing) {
    debug('resume');
    state.flowing = true;
    resume(this, state);
  }
  return this;
};

function resume(stream, state) {
  if (!state.resumeScheduled) {
    state.resumeScheduled = true;
    processNextTick(resume_, stream, state);
  }
}

function resume_(stream, state) {
  if (!state.reading) {
    debug('resume read 0');
    stream.read(0);
  }

  state.resumeScheduled = false;
  stream.emit('resume');
  flow(stream);
  if (state.flowing && !state.reading) stream.read(0);
}

Readable.prototype.pause = function () {
  debug('call pause flowing=%j', this._readableState.flowing);
  if (false !== this._readableState.flowing) {
    debug('pause');
    this._readableState.flowing = false;
    this.emit('pause');
  }
  return this;
};

function flow(stream) {
  var state = stream._readableState;
  debug('flow', state.flowing);
  if (state.flowing) {
    do {
      var chunk = stream.read();
    } while (null !== chunk && state.flowing);
  }
}

// wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function (stream) {
  var state = this._readableState;
  var paused = false;

  var self = this;
  stream.on('end', function () {
    debug('wrapped end');
    if (state.decoder && !state.ended) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) self.push(chunk);
    }

    self.push(null);
  });

  stream.on('data', function (chunk) {
    debug('wrapped data');
    if (state.decoder) chunk = state.decoder.write(chunk);

    // don't skip over falsy values in objectMode
    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

    var ret = self.push(chunk);
    if (!ret) {
      paused = true;
      stream.pause();
    }
  });

  // proxy all the other methods.
  // important when wrapping filters and duplexes.
  for (var i in stream) {
    if (this[i] === undefined && typeof stream[i] === 'function') {
      this[i] = function (method) {
        return function () {
          return stream[method].apply(stream, arguments);
        };
      }(i);
    }
  }

  // proxy certain important events.
  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
  forEach(events, function (ev) {
    stream.on(ev, self.emit.bind(self, ev));
  });

  // when we try to consume some more bytes, simply unpause the
  // underlying stream.
  self._read = function (n) {
    debug('wrapped _read', n);
    if (paused) {
      paused = false;
      stream.resume();
    }
  };

  return self;
};

// exposed for testing purposes only.
Readable._fromList = fromList;

// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
function fromList(n, state) {
  var list = state.buffer;
  var length = state.length;
  var stringMode = !!state.decoder;
  var objectMode = !!state.objectMode;
  var ret;

  // nothing in the list, definitely empty.
  if (list.length === 0) return null;

  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
    // read it all, truncate the array.
    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
    list.length = 0;
  } else {
    // read just some of it.
    if (n < list[0].length) {
      // just take a part of the first list item.
      // slice is the same for buffers and strings.
      var buf = list[0];
      ret = buf.slice(0, n);
      list[0] = buf.slice(n);
    } else if (n === list[0].length) {
      // first list is a perfect match
      ret = list.shift();
    } else {
      // complex case.
      // we have enough to cover it, but it spans past the first buffer.
      if (stringMode) ret = '';else ret = new Buffer(n);

      var c = 0;
      for (var i = 0, l = list.length; i < l && c < n; i++) {
        var buf = list[0];
        var cpy = Math.min(n - c, buf.length);

        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);

        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();

        c += cpy;
      }
    }
  }

  return ret;
}

function endReadable(stream) {
  var state = stream._readableState;

  // If we get here before consuming all the bytes, then that is a
  // bug in node.  Should never happen.
  if (state.length > 0) throw new Error('endReadable called on non-empty stream');

  if (!state.endEmitted) {
    state.ended = true;
    processNextTick(endReadableNT, state, stream);
  }
}

function endReadableNT(state, stream) {
  // Check that we didn't get one last unshift.
  if (!state.endEmitted && state.length === 0) {
    state.endEmitted = true;
    stream.readable = false;
    stream.emit('end');
  }
}

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}

function indexOf(xs, x) {
  for (var i = 0, l = xs.length; i < l; i++) {
    if (xs[i] === x) return i;
  }
  return -1;
}
}).call(this,require('_process'))
},{"./_stream_duplex":39,"_process":36,"buffer":5,"core-util-is":7,"events":9,"inherits":32,"isarray":44,"process-nextick-args":35,"string_decoder/":58,"util":3}],42:[function(require,module,exports){
// a transform stream is a readable/writable stream where you do
// something with the data.  Sometimes it's called a "filter",
// but that's not a great name for it, since that implies a thing where
// some bits pass through, and others are simply ignored.  (That would
// be a valid example of a transform, of course.)
//
// While the output is causally related to the input, it's not a
// necessarily symmetric or synchronous transformation.  For example,
// a zlib stream might take multiple plain-text writes(), and then
// emit a single compressed chunk some time in the future.
//
// Here's how this works:
//
// The Transform stream has all the aspects of the readable and writable
// stream classes.  When you write(chunk), that calls _write(chunk,cb)
// internally, and returns false if there's a lot of pending writes
// buffered up.  When you call read(), that calls _read(n) until
// there's enough pending readable data buffered up.
//
// In a transform stream, the written data is placed in a buffer.  When
// _read(n) is called, it transforms the queued up data, calling the
// buffered _write cb's as it consumes chunks.  If consuming a single
// written chunk would result in multiple output chunks, then the first
// outputted bit calls the readcb, and subsequent chunks just go into
// the read buffer, and will cause it to emit 'readable' if necessary.
//
// This way, back-pressure is actually determined by the reading side,
// since _read has to be called to start processing a new chunk.  However,
// a pathological inflate type of transform can cause excessive buffering
// here.  For example, imagine a stream where every byte of input is
// interpreted as an integer from 0-255, and then results in that many
// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
// 1kb of data being output.  In this case, you could write a very small
// amount of input, and end up with a very large amount of output.  In
// such a pathological inflating mechanism, there'd be no way to tell
// the system to stop doing the transform.  A single 4MB write could
// cause the system to run out of memory.
//
// However, even in such a pathological case, only a single written chunk
// would be consumed, and then the rest would wait (un-transformed) until
// the results of the previous transformed chunk were consumed.

'use strict';

module.exports = Transform;

var Duplex = require('./_stream_duplex');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(Transform, Duplex);

function TransformState(stream) {
  this.afterTransform = function (er, data) {
    return afterTransform(stream, er, data);
  };

  this.needTransform = false;
  this.transforming = false;
  this.writecb = null;
  this.writechunk = null;
  this.writeencoding = null;
}

function afterTransform(stream, er, data) {
  var ts = stream._transformState;
  ts.transforming = false;

  var cb = ts.writecb;

  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));

  ts.writechunk = null;
  ts.writecb = null;

  if (data !== null && data !== undefined) stream.push(data);

  cb(er);

  var rs = stream._readableState;
  rs.reading = false;
  if (rs.needReadable || rs.length < rs.highWaterMark) {
    stream._read(rs.highWaterMark);
  }
}

function Transform(options) {
  if (!(this instanceof Transform)) return new Transform(options);

  Duplex.call(this, options);

  this._transformState = new TransformState(this);

  // when the writable side finishes, then flush out anything remaining.
  var stream = this;

  // start out asking for a readable event once data is transformed.
  this._readableState.needReadable = true;

  // we have implemented the _read method, and done the other things
  // that Readable wants before the first _read call, so unset the
  // sync guard flag.
  this._readableState.sync = false;

  if (options) {
    if (typeof options.transform === 'function') this._transform = options.transform;

    if (typeof options.flush === 'function') this._flush = options.flush;
  }

  this.once('prefinish', function () {
    if (typeof this._flush === 'function') this._flush(function (er) {
      done(stream, er);
    });else done(stream);
  });
}

Transform.prototype.push = function (chunk, encoding) {
  this._transformState.needTransform = false;
  return Duplex.prototype.push.call(this, chunk, encoding);
};

// This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side.  You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk.  If you pass
// an error, then that'll put the hurt on the whole operation.  If you
// never call cb(), then you'll never get another chunk.
Transform.prototype._transform = function (chunk, encoding, cb) {
  throw new Error('not implemented');
};

Transform.prototype._write = function (chunk, encoding, cb) {
  var ts = this._transformState;
  ts.writecb = cb;
  ts.writechunk = chunk;
  ts.writeencoding = encoding;
  if (!ts.transforming) {
    var rs = this._readableState;
    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
  }
};

// Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.
Transform.prototype._read = function (n) {
  var ts = this._transformState;

  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
    ts.transforming = true;
    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
  } else {
    // mark that we need a transform, so that any data that comes in
    // will get processed, now that we've asked for it.
    ts.needTransform = true;
  }
};

function done(stream, er) {
  if (er) return stream.emit('error', er);

  // if there's nothing in the write buffer, then that means
  // that nothing more will ever be provided
  var ws = stream._writableState;
  var ts = stream._transformState;

  if (ws.length) throw new Error('calling transform done when ws.length != 0');

  if (ts.transforming) throw new Error('calling transform done when still transforming');

  return stream.push(null);
}
},{"./_stream_duplex":39,"core-util-is":7,"inherits":32}],43:[function(require,module,exports){
// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.

'use strict';

module.exports = Writable;

/*<replacement>*/
var processNextTick = require('process-nextick-args');
/*</replacement>*/

/*<replacement>*/
var asyncWrite = !true ? setImmediate : processNextTick;
/*</replacement>*/

/*<replacement>*/
var Buffer = require('buffer').Buffer;
/*</replacement>*/

Writable.WritableState = WritableState;

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

/*<replacement>*/
var internalUtil = {
  deprecate: require('util-deprecate')
};
/*</replacement>*/

/*<replacement>*/
var Stream;
(function () {
  try {
    Stream = require('st' + 'ream');
  } catch (_) {} finally {
    if (!Stream) Stream = require('events').EventEmitter;
  }
})();
/*</replacement>*/

var Buffer = require('buffer').Buffer;

util.inherits(Writable, Stream);

function nop() {}

function WriteReq(chunk, encoding, cb) {
  this.chunk = chunk;
  this.encoding = encoding;
  this.callback = cb;
  this.next = null;
}

var Duplex;
function WritableState(options, stream) {
  Duplex = Duplex || require('./_stream_duplex');

  options = options || {};

  // object stream flag to indicate whether or not this stream
  // contains buffers or objects.
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;

  // the point at which write() starts returning false
  // Note: 0 is a valid value, means that we always return false if
  // the entire buffer is not flushed immediately on write()
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = ~ ~this.highWaterMark;

  this.needDrain = false;
  // at the start of calling end()
  this.ending = false;
  // when end() has been called, and returned
  this.ended = false;
  // when 'finish' is emitted
  this.finished = false;

  // should we decode strings into buffers before passing to _write?
  // this is here so that some node-core streams can optimize string
  // handling at a lower level.
  var noDecode = options.decodeStrings === false;
  this.decodeStrings = !noDecode;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // not an actual buffer we keep track of, but a measurement
  // of how much we're waiting to get pushed to some underlying
  // socket or file.
  this.length = 0;

  // a flag to see when we're in the middle of a write.
  this.writing = false;

  // when true all writes will be buffered until .uncork() call
  this.corked = 0;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // a flag to know if we're processing previously buffered items, which
  // may call the _write() callback in the same tick, so that we don't
  // end up in an overlapped onwrite situation.
  this.bufferProcessing = false;

  // the callback that's passed to _write(chunk,cb)
  this.onwrite = function (er) {
    onwrite(stream, er);
  };

  // the callback that the user supplies to write(chunk,encoding,cb)
  this.writecb = null;

  // the amount that is being written when _write is called.
  this.writelen = 0;

  this.bufferedRequest = null;
  this.lastBufferedRequest = null;

  // number of pending user-supplied write callbacks
  // this must be 0 before 'finish' can be emitted
  this.pendingcb = 0;

  // emit prefinish if the only thing we're waiting for is _write cbs
  // This is relevant for synchronous Transform streams
  this.prefinished = false;

  // True if the error was already emitted and should not be thrown again
  this.errorEmitted = false;

  // count buffered requests
  this.bufferedRequestCount = 0;

  // create the two objects needed to store the corked requests
  // they are not a linked list, as no new elements are inserted in there
  this.corkedRequestsFree = new CorkedRequest(this);
  this.corkedRequestsFree.next = new CorkedRequest(this);
}

WritableState.prototype.getBuffer = function writableStateGetBuffer() {
  var current = this.bufferedRequest;
  var out = [];
  while (current) {
    out.push(current);
    current = current.next;
  }
  return out;
};

(function () {
  try {
    Object.defineProperty(WritableState.prototype, 'buffer', {
      get: internalUtil.deprecate(function () {
        return this.getBuffer();
      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
    });
  } catch (_) {}
})();

var Duplex;
function Writable(options) {
  Duplex = Duplex || require('./_stream_duplex');

  // Writable ctor is applied to Duplexes, though they're not
  // instanceof Writable, they're instanceof Readable.
  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);

  this._writableState = new WritableState(options, this);

  // legacy.
  this.writable = true;

  if (options) {
    if (typeof options.write === 'function') this._write = options.write;

    if (typeof options.writev === 'function') this._writev = options.writev;
  }

  Stream.call(this);
}

// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function () {
  this.emit('error', new Error('Cannot pipe. Not readable.'));
};

function writeAfterEnd(stream, cb) {
  var er = new Error('write after end');
  // TODO: defer error events consistently everywhere, not just the cb
  stream.emit('error', er);
  processNextTick(cb, er);
}

// If we get something that is not a buffer, string, null, or undefined,
// and we're not in objectMode, then that's an error.
// Otherwise stream chunks are all considered to be of length=1, and the
// watermarks determine how many objects to keep in the buffer, rather than
// how many bytes or characters.
function validChunk(stream, state, chunk, cb) {
  var valid = true;

  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
    var er = new TypeError('Invalid non-string/buffer chunk');
    stream.emit('error', er);
    processNextTick(cb, er);
    valid = false;
  }
  return valid;
}

Writable.prototype.write = function (chunk, encoding, cb) {
  var state = this._writableState;
  var ret = false;

  if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;

  if (typeof cb !== 'function') cb = nop;

  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
    state.pendingcb++;
    ret = writeOrBuffer(this, state, chunk, encoding, cb);
  }

  return ret;
};

Writable.prototype.cork = function () {
  var state = this._writableState;

  state.corked++;
};

Writable.prototype.uncork = function () {
  var state = this._writableState;

  if (state.corked) {
    state.corked--;

    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
  }
};

Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
  // node::ParseEncoding() requires lower case.
  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
  this._writableState.defaultEncoding = encoding;
};

function decodeChunk(state, chunk, encoding) {
  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
    chunk = new Buffer(chunk, encoding);
  }
  return chunk;
}

// if we're already writing something, then just put this
// in the queue, and wait our turn.  Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, chunk, encoding, cb) {
  chunk = decodeChunk(state, chunk, encoding);

  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
  var len = state.objectMode ? 1 : chunk.length;

  state.length += len;

  var ret = state.length < state.highWaterMark;
  // we must ensure that previous needDrain will not be reset to false.
  if (!ret) state.needDrain = true;

  if (state.writing || state.corked) {
    var last = state.lastBufferedRequest;
    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
    if (last) {
      last.next = state.lastBufferedRequest;
    } else {
      state.bufferedRequest = state.lastBufferedRequest;
    }
    state.bufferedRequestCount += 1;
  } else {
    doWrite(stream, state, false, len, chunk, encoding, cb);
  }

  return ret;
}

function doWrite(stream, state, writev, len, chunk, encoding, cb) {
  state.writelen = len;
  state.writecb = cb;
  state.writing = true;
  state.sync = true;
  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
  state.sync = false;
}

function onwriteError(stream, state, sync, er, cb) {
  --state.pendingcb;
  if (sync) processNextTick(cb, er);else cb(er);

  stream._writableState.errorEmitted = true;
  stream.emit('error', er);
}

function onwriteStateUpdate(state) {
  state.writing = false;
  state.writecb = null;
  state.length -= state.writelen;
  state.writelen = 0;
}

function onwrite(stream, er) {
  var state = stream._writableState;
  var sync = state.sync;
  var cb = state.writecb;

  onwriteStateUpdate(state);

  if (er) onwriteError(stream, state, sync, er, cb);else {
    // Check if we're actually ready to finish, but don't emit yet
    var finished = needFinish(state);

    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
      clearBuffer(stream, state);
    }

    if (sync) {
      /*<replacement>*/
      asyncWrite(afterWrite, stream, state, finished, cb);
      /*</replacement>*/
    } else {
        afterWrite(stream, state, finished, cb);
      }
  }
}

function afterWrite(stream, state, finished, cb) {
  if (!finished) onwriteDrain(stream, state);
  state.pendingcb--;
  cb();
  finishMaybe(stream, state);
}

// Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.
function onwriteDrain(stream, state) {
  if (state.length === 0 && state.needDrain) {
    state.needDrain = false;
    stream.emit('drain');
  }
}

// if there's something in the buffer waiting, then process it
function clearBuffer(stream, state) {
  state.bufferProcessing = true;
  var entry = state.bufferedRequest;

  if (stream._writev && entry && entry.next) {
    // Fast case, write everything using _writev()
    var l = state.bufferedRequestCount;
    var buffer = new Array(l);
    var holder = state.corkedRequestsFree;
    holder.entry = entry;

    var count = 0;
    while (entry) {
      buffer[count] = entry;
      entry = entry.next;
      count += 1;
    }

    doWrite(stream, state, true, state.length, buffer, '', holder.finish);

    // doWrite is always async, defer these to save a bit of time
    // as the hot path ends with doWrite
    state.pendingcb++;
    state.lastBufferedRequest = null;
    state.corkedRequestsFree = holder.next;
    holder.next = null;
  } else {
    // Slow case, write chunks one-by-one
    while (entry) {
      var chunk = entry.chunk;
      var encoding = entry.encoding;
      var cb = entry.callback;
      var len = state.objectMode ? 1 : chunk.length;

      doWrite(stream, state, false, len, chunk, encoding, cb);
      entry = entry.next;
      // if we didn't call the onwrite immediately, then
      // it means that we need to wait until it does.
      // also, that means that the chunk and cb are currently
      // being processed, so move the buffer counter past them.
      if (state.writing) {
        break;
      }
    }

    if (entry === null) state.lastBufferedRequest = null;
  }

  state.bufferedRequestCount = 0;
  state.bufferedRequest = entry;
  state.bufferProcessing = false;
}

Writable.prototype._write = function (chunk, encoding, cb) {
  cb(new Error('not implemented'));
};

Writable.prototype._writev = null;

Writable.prototype.end = function (chunk, encoding, cb) {
  var state = this._writableState;

  if (typeof chunk === 'function') {
    cb = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);

  // .end() fully uncorks
  if (state.corked) {
    state.corked = 1;
    this.uncork();
  }

  // ignore unnecessary end() calls.
  if (!state.ending && !state.finished) endWritable(this, state, cb);
};

function needFinish(state) {
  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}

function prefinish(stream, state) {
  if (!state.prefinished) {
    state.prefinished = true;
    stream.emit('prefinish');
  }
}

function finishMaybe(stream, state) {
  var need = needFinish(state);
  if (need) {
    if (state.pendingcb === 0) {
      prefinish(stream, state);
      state.finished = true;
      stream.emit('finish');
    } else {
      prefinish(stream, state);
    }
  }
  return need;
}

function endWritable(stream, state, cb) {
  state.ending = true;
  finishMaybe(stream, state);
  if (cb) {
    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
  }
  state.ended = true;
  stream.writable = false;
}

// It seems a linked list but it is not
// there will be only 2 of these for each stream
function CorkedRequest(state) {
  var _this = this;

  this.next = null;
  this.entry = null;

  this.finish = function (err) {
    var entry = _this.entry;
    _this.entry = null;
    while (entry) {
      var cb = entry.callback;
      state.pendingcb--;
      cb(err);
      entry = entry.next;
    }
    if (state.corkedRequestsFree) {
      state.corkedRequestsFree.next = _this;
    } else {
      state.corkedRequestsFree = _this;
    }
  };
}
},{"./_stream_duplex":39,"buffer":5,"core-util-is":7,"events":9,"inherits":32,"process-nextick-args":35,"util-deprecate":59}],44:[function(require,module,exports){
arguments[4][6][0].apply(exports,arguments)
},{"dup":6}],45:[function(require,module,exports){
module.exports = require("./lib/_stream_passthrough.js")

},{"./lib/_stream_passthrough.js":40}],46:[function(require,module,exports){
var Stream = (function (){
  try {
    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
  } catch(_){}
}());
exports = module.exports = require('./lib/_stream_readable.js');
exports.Stream = Stream || exports;
exports.Readable = exports;
exports.Writable = require('./lib/_stream_writable.js');
exports.Duplex = require('./lib/_stream_duplex.js');
exports.Transform = require('./lib/_stream_transform.js');
exports.PassThrough = require('./lib/_stream_passthrough.js');

// inline-process-browser and unreachable-branch-transform make sure this is
// removed in browserify builds
if (!true) {
  module.exports = require('stream');
}

},{"./lib/_stream_duplex.js":39,"./lib/_stream_passthrough.js":40,"./lib/_stream_readable.js":41,"./lib/_stream_transform.js":42,"./lib/_stream_writable.js":43,"stream":57}],47:[function(require,module,exports){
module.exports = require("./lib/_stream_transform.js")

},{"./lib/_stream_transform.js":42}],48:[function(require,module,exports){
module.exports = require("./lib/_stream_writable.js")

},{"./lib/_stream_writable.js":43}],49:[function(require,module,exports){
exports.dash = require("./lib/rw/dash");
exports.readFile = require("./lib/rw/read-file");
exports.readFileSync = require("./lib/rw/read-file-sync");
exports.writeFile = require("./lib/rw/write-file");
exports.writeFileSync = require("./lib/rw/write-file-sync");

},{"./lib/rw/dash":50,"./lib/rw/read-file":54,"./lib/rw/read-file-sync":53,"./lib/rw/write-file":56,"./lib/rw/write-file-sync":55}],50:[function(require,module,exports){
var slice = Array.prototype.slice;

function dashify(method, file) {
  return function(path) {
    var argv = arguments;
    if (path == "-") (argv = slice.call(argv)).splice(0, 1, file);
    return method.apply(null, argv);
  };
}

exports.readFile = dashify(require("./read-file"), "/dev/stdin");
exports.readFileSync = dashify(require("./read-file-sync"), "/dev/stdin");
exports.writeFile = dashify(require("./write-file"), "/dev/stdout");
exports.writeFileSync = dashify(require("./write-file-sync"), "/dev/stdout");

},{"./read-file":54,"./read-file-sync":53,"./write-file":56,"./write-file-sync":55}],51:[function(require,module,exports){
(function (Buffer){
module.exports = function(options) {
  if (options) {
    if (typeof options === "string") return encoding(options);
    if (options.encoding !== null) return encoding(options.encoding);
  }
  return identity();
};

function identity() {
  var chunks = [];
  return {
    push: function(chunk) { chunks.push(chunk); },
    value: function() { return Buffer.concat(chunks); }
  };
}

function encoding(encoding) {
  var chunks = [];
  return {
    push: function(chunk) { chunks.push(chunk); },
    value: function() { return Buffer.concat(chunks).toString(encoding); }
  };
}

}).call(this,require("buffer").Buffer)
},{"buffer":5}],52:[function(require,module,exports){
(function (Buffer){
module.exports = function(data, options) {
  return typeof data === "string"
      ? new Buffer(data, typeof options === "string" ? options
          : options && options.encoding !== null ? options.encoding
          : "utf8")
      : data;
};

}).call(this,require("buffer").Buffer)
},{"buffer":5}],53:[function(require,module,exports){
(function (Buffer){
var fs = require("fs"),
    decode = require("./decode");

module.exports = function(filename, options) {
  if (fs.statSync(filename).isFile()) {
    return fs.readFileSync(filename, options);
  } else {
    var fd = fs.openSync(filename, options && options.flag || "r"),
        decoder = decode(options);

    while (true) {
      try {
        var buffer = new Buffer(bufferSize),
            bytesRead = fs.readSync(fd, buffer, 0, bufferSize);
      } catch (e) {
        if (e.code === "EOF") break;
        fs.closeSync(fd);
        throw e;
      }
      if (bytesRead === 0) break;
      decoder.push(buffer.slice(0, bytesRead));
    }

    fs.closeSync(fd);
    return decoder.value();
  }
};

var bufferSize = 1 << 16;

}).call(this,require("buffer").Buffer)
},{"./decode":51,"buffer":5,"fs":4}],54:[function(require,module,exports){
(function (process){
var fs = require("fs"),
    decode = require("./decode");

module.exports = function(filename, options, callback) {
  if (arguments.length < 3) callback = options, options = null;
  fs.stat(filename, function(error, stat) {
    if (error) return callback(error);
    if (stat.isFile()) {
      fs.readFile(filename, options, callback);
    } else {
      var decoder = decode(options), stream;

      switch (filename) {
        case "/dev/stdin": stream = process.stdin; break;
        default: stream = fs.createReadStream(filename, options ? {flags: options.flag || "r"} : {}); break; // N.B. flag / flags
      }

      stream
          .on("error", callback)
          .on("data", function(d) { decoder.push(d); })
          .on("end", function() { callback(null, decoder.value()); });
    }
  });
};

}).call(this,require('_process'))
},{"./decode":51,"_process":36,"fs":4}],55:[function(require,module,exports){
var fs = require("fs"),
    encode = require("./encode");

module.exports = function(filename, data, options) {
  var stat;

  try {
    stat = fs.statSync(filename);
  } catch (error) {
    if (error.code !== "ENOENT") throw error;
  }

  if (!stat || stat.isFile()) {
    fs.writeFileSync(filename, data, options);
  } else {
    var fd = fs.openSync(filename, options && options.flag || "w"),
        bytesWritten = 0,
        bytesTotal = (data = encode(data, options)).length;

    while (bytesWritten < bytesTotal) {
      try {
        bytesWritten += fs.writeSync(fd, data, bytesWritten, bytesTotal - bytesWritten, null);
      } catch (error) {
        if (error.code === "EPIPE") break; // ignore broken pipe, e.g., | head
        fs.closeSync(fd);
        throw error;
      }
    }

    fs.closeSync(fd);
  }
};

},{"./encode":52,"fs":4}],56:[function(require,module,exports){
(function (process){
var fs = require("fs"),
    encode = require("./encode");

module.exports = function(filename, data, options, callback) {
  if (arguments.length < 4) callback = options, options = null;
  fs.stat(filename, function(error, stat) {
    if (error && error.code !== "ENOENT") return callback(error);
    if (stat && stat.isFile()) {
      fs.writeFile(filename, data, options, callback);
    } else {
      var stream, send = "end";

      switch (filename) {
        case "/dev/stdout": stream = process.stdout, send = "write"; break;
        case "/dev/stderr": stream = process.stderr, send = "write"; break;
        default: stream = fs.createWriteStream(filename, options ? {flags: options.flag || "w"} : {}); break; // N.B. flag / flags
      }

      stream
          .on("error", function(error) { callback(error.code === "EPIPE" ? null : error); }) // ignore broken pipe, e.g., | head
          [send](encode(data, options), function(error) { callback(error && error.code === "EPIPE" ? null : error); });
    }
  });
};

}).call(this,require('_process'))
},{"./encode":52,"_process":36,"fs":4}],57:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

module.exports = Stream;

var EE = require('events').EventEmitter;
var inherits = require('inherits');

inherits(Stream, EE);
Stream.Readable = require('readable-stream/readable.js');
Stream.Writable = require('readable-stream/writable.js');
Stream.Duplex = require('readable-stream/duplex.js');
Stream.Transform = require('readable-stream/transform.js');
Stream.PassThrough = require('readable-stream/passthrough.js');

// Backwards-compat with node 0.4.x
Stream.Stream = Stream;



// old-style streams.  Note that the pipe method (the only relevant
// part of this class) is overridden in the Readable class.

function Stream() {
  EE.call(this);
}

Stream.prototype.pipe = function(dest, options) {
  var source = this;

  function ondata(chunk) {
    if (dest.writable) {
      if (false === dest.write(chunk) && source.pause) {
        source.pause();
      }
    }
  }

  source.on('data', ondata);

  function ondrain() {
    if (source.readable && source.resume) {
      source.resume();
    }
  }

  dest.on('drain', ondrain);

  // If the 'end' option is not supplied, dest.end() will be called when
  // source gets the 'end' or 'close' events.  Only dest.end() once.
  if (!dest._isStdio && (!options || options.end !== false)) {
    source.on('end', onend);
    source.on('close', onclose);
  }

  var didOnEnd = false;
  function onend() {
    if (didOnEnd) return;
    didOnEnd = true;

    dest.end();
  }


  function onclose() {
    if (didOnEnd) return;
    didOnEnd = true;

    if (typeof dest.destroy === 'function') dest.destroy();
  }

  // don't leave dangling pipes when there are errors.
  function onerror(er) {
    cleanup();
    if (EE.listenerCount(this, 'error') === 0) {
      throw er; // Unhandled stream error in pipe.
    }
  }

  source.on('error', onerror);
  dest.on('error', onerror);

  // remove all the event listeners that were added.
  function cleanup() {
    source.removeListener('data', ondata);
    dest.removeListener('drain', ondrain);

    source.removeListener('end', onend);
    source.removeListener('close', onclose);

    source.removeListener('error', onerror);
    dest.removeListener('error', onerror);

    source.removeListener('end', cleanup);
    source.removeListener('close', cleanup);

    dest.removeListener('close', cleanup);
  }

  source.on('end', cleanup);
  source.on('close', cleanup);

  dest.on('close', cleanup);

  dest.emit('pipe', source);

  // Allow for unix-like usage: A.pipe(B).pipe(C)
  return dest;
};

},{"events":9,"inherits":32,"readable-stream/duplex.js":38,"readable-stream/passthrough.js":45,"readable-stream/readable.js":46,"readable-stream/transform.js":47,"readable-stream/writable.js":48}],58:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var Buffer = require('buffer').Buffer;

var isBufferEncoding = Buffer.isEncoding
  || function(encoding) {
       switch (encoding && encoding.toLowerCase()) {
         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
         default: return false;
       }
     }


function assertEncoding(encoding) {
  if (encoding && !isBufferEncoding(encoding)) {
    throw new Error('Unknown encoding: ' + encoding);
  }
}

// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters. CESU-8 is handled as part of the UTF-8 encoding.
//
// @TODO Handling all encodings inside a single object makes it very difficult
// to reason about this code, so it should be split up in the future.
// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
// points as used by CESU-8.
var StringDecoder = exports.StringDecoder = function(encoding) {
  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
  assertEncoding(encoding);
  switch (this.encoding) {
    case 'utf8':
      // CESU-8 represents each of Surrogate Pair by 3-bytes
      this.surrogateSize = 3;
      break;
    case 'ucs2':
    case 'utf16le':
      // UTF-16 represents each of Surrogate Pair by 2-bytes
      this.surrogateSize = 2;
      this.detectIncompleteChar = utf16DetectIncompleteChar;
      break;
    case 'base64':
      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
      this.surrogateSize = 3;
      this.detectIncompleteChar = base64DetectIncompleteChar;
      break;
    default:
      this.write = passThroughWrite;
      return;
  }

  // Enough space to store all bytes of a single character. UTF-8 needs 4
  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
  this.charBuffer = new Buffer(6);
  // Number of bytes received for the current incomplete multi-byte character.
  this.charReceived = 0;
  // Number of bytes expected for the current incomplete multi-byte character.
  this.charLength = 0;
};


// write decodes the given buffer and returns it as JS string that is
// guaranteed to not contain any partial multi-byte characters. Any partial
// character found at the end of the buffer is buffered up, and will be
// returned when calling write again with the remaining bytes.
//
// Note: Converting a Buffer containing an orphan surrogate to a String
// currently works, but converting a String to a Buffer (via `new Buffer`, or
// Buffer#write) will replace incomplete surrogates with the unicode
// replacement character. See https://codereview.chromium.org/121173009/ .
StringDecoder.prototype.write = function(buffer) {
  var charStr = '';
  // if our last write ended with an incomplete multibyte character
  while (this.charLength) {
    // determine how many remaining bytes this buffer has to offer for this char
    var available = (buffer.length >= this.charLength - this.charReceived) ?
        this.charLength - this.charReceived :
        buffer.length;

    // add the new bytes to the char buffer
    buffer.copy(this.charBuffer, this.charReceived, 0, available);
    this.charReceived += available;

    if (this.charReceived < this.charLength) {
      // still not enough chars in this buffer? wait for more ...
      return '';
    }

    // remove bytes belonging to the current character from the buffer
    buffer = buffer.slice(available, buffer.length);

    // get the character that was split
    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);

    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
    var charCode = charStr.charCodeAt(charStr.length - 1);
    if (charCode >= 0xD800 && charCode <= 0xDBFF) {
      this.charLength += this.surrogateSize;
      charStr = '';
      continue;
    }
    this.charReceived = this.charLength = 0;

    // if there are no more bytes in this buffer, just emit our char
    if (buffer.length === 0) {
      return charStr;
    }
    break;
  }

  // determine and set charLength / charReceived
  this.detectIncompleteChar(buffer);

  var end = buffer.length;
  if (this.charLength) {
    // buffer the incomplete character bytes we got
    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
    end -= this.charReceived;
  }

  charStr += buffer.toString(this.encoding, 0, end);

  var end = charStr.length - 1;
  var charCode = charStr.charCodeAt(end);
  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
  if (charCode >= 0xD800 && charCode <= 0xDBFF) {
    var size = this.surrogateSize;
    this.charLength += size;
    this.charReceived += size;
    this.charBuffer.copy(this.charBuffer, size, 0, size);
    buffer.copy(this.charBuffer, 0, 0, size);
    return charStr.substring(0, end);
  }

  // or just emit the charStr
  return charStr;
};

// detectIncompleteChar determines if there is an incomplete UTF-8 character at
// the end of the given buffer. If so, it sets this.charLength to the byte
// length that character, and sets this.charReceived to the number of bytes
// that are available for this character.
StringDecoder.prototype.detectIncompleteChar = function(buffer) {
  // determine how many bytes we have to check at the end of this buffer
  var i = (buffer.length >= 3) ? 3 : buffer.length;

  // Figure out if one of the last i bytes of our buffer announces an
  // incomplete char.
  for (; i > 0; i--) {
    var c = buffer[buffer.length - i];

    // See http://en.wikipedia.org/wiki/UTF-8#Description

    // 110XXXXX
    if (i == 1 && c >> 5 == 0x06) {
      this.charLength = 2;
      break;
    }

    // 1110XXXX
    if (i <= 2 && c >> 4 == 0x0E) {
      this.charLength = 3;
      break;
    }

    // 11110XXX
    if (i <= 3 && c >> 3 == 0x1E) {
      this.charLength = 4;
      break;
    }
  }
  this.charReceived = i;
};

StringDecoder.prototype.end = function(buffer) {
  var res = '';
  if (buffer && buffer.length)
    res = this.write(buffer);

  if (this.charReceived) {
    var cr = this.charReceived;
    var buf = this.charBuffer;
    var enc = this.encoding;
    res += buf.slice(0, cr).toString(enc);
  }

  return res;
};

function passThroughWrite(buffer) {
  return buffer.toString(this.encoding);
}

function utf16DetectIncompleteChar(buffer) {
  this.charReceived = buffer.length % 2;
  this.charLength = this.charReceived ? 2 : 0;
}

function base64DetectIncompleteChar(buffer) {
  this.charReceived = buffer.length % 3;
  this.charLength = this.charReceived ? 3 : 0;
}

},{"buffer":5}],59:[function(require,module,exports){
(function (global){

/**
 * Module exports.
 */

module.exports = deprecate;

/**
 * Mark that a method should not be used.
 * Returns a modified function which warns once by default.
 *
 * If `localStorage.noDeprecation = true` is set, then it is a no-op.
 *
 * If `localStorage.throwDeprecation = true` is set, then deprecated functions
 * will throw an Error when invoked.
 *
 * If `localStorage.traceDeprecation = true` is set, then deprecated functions
 * will invoke `console.trace()` instead of `console.error()`.
 *
 * @param {Function} fn - the function to deprecate
 * @param {String} msg - the string to print to the console when `fn` is invoked
 * @returns {Function} a new "deprecated" version of `fn`
 * @api public
 */

function deprecate (fn, msg) {
  if (config('noDeprecation')) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (config('throwDeprecation')) {
        throw new Error(msg);
      } else if (config('traceDeprecation')) {
        console.trace(msg);
      } else {
        console.warn(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
}

/**
 * Checks `localStorage` for boolean values for the given `name`.
 *
 * @param {String} name
 * @returns {Boolean}
 * @api private
 */

function config (name) {
  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
  try {
    if (!global.localStorage) return false;
  } catch (_) {
    return false;
  }
  var val = global.localStorage[name];
  if (null == val) return false;
  return String(val).toLowerCase() === 'true';
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}]},{},[1]);


================================================
FILE: page.css
================================================
/*
@import url(http://fonts.googleapis.com/css?family=Source+Sans+Pro:400,600);
*/

@font-face {
  font-family: 'Source Sans Pro';
  font-style: normal;
  font-weight: 400;
  src: local('Source Sans Pro'), local('SourceSansPro-Regular'), url(SourceSansPro-Regular.woff) format('woff');
}

@font-face {
  font-family: 'Source Sans Pro';
  font-style: normal;
  font-weight: 600;
  src: local('Source Sans Pro Semibold'), local('SourceSansPro-Semibold'), url(SourceSansPro-Semibold.woff) format('woff');
}

html, body {
	height: 100%;
	width: 100%;
	margin: 0;
	padding: 0;
}

body {
	overflow: hidden;
	background-color: #fff;
	font: 14px/1.4 'Source Sans Pro', Helvetica, sans-serif;
	color: #444;
	user-select: none;
	-webkit-user-select: none;
	-moz-user-select: none;
	cursor: default;
}

.selectable,.selectable * {
	user-select: default;
	-webkit-user-select: text;
	-moz-user-select: text;
	cursor: text;
}


/* --- Themed elements -------------- */

.page-header,
.dialog-btn {
	background-color: #1385b7;
}

.colored-text {
	color: #0774a5;
}


.dot-underline {
	border-bottom: 1px dotted #0774a5;
}

.nav-btn * {
	fill: #1385b7;
}

.dialog-btn:hover,
.header-btn:hover {
	background-color: #0F5A84;
}

.colored-text::selection {
	background-color: #e6f7ff;
}

.colored-text::-moz-selection {
	background-color: #e6f7ff;
}

.layer-item.active {
	background-color: #e6f7ff;
}

/* THEME 2  */

.theme2 .page-header,
.theme2 .dialog-btn {
	background-color: #678691;
}

.theme2 .colored-text {
	color: #678691;
}

.theme2 .dot-underline {
	border-bottom: 1px dotted #678691;
}

.theme2 .nav-btn * {
	fill: #678691;
}

.theme2 .dialog-btn:hover,
.theme2 .header-btn:hover {
	background-color: #365A68;
}

.theme2 .colored-text::selection {
	background-color: #DEF1F9;
}

.theme2 .colored-text::-moz-selection {
	background-color: #DEF1F9;
}

.theme2 .layer-item.active {
	background-color: #DEF1F9;
}

/* THEME 3 -- GREY */

.theme3 .page-header,
.theme3 .dialog-btn {
	background-color: #8c8c8c;
}

.theme3 .nav-btn * {
	fill: #8c8c8c;
}

.theme3 .nav-btn.selected {
	background-color: black;
}

.theme3 .dialog-btn:hover,
.theme3 .header-btn:hover {
	background-color: #555;
}

/* --- Page header --------------- */

.page-header {
	position: absolute;
	color: white;
	top: 0;
	left: 0;
	z-index: 40;
	width: 100%;
	height: 32px;
}

#coordinate-info {
	z-index: 1;
	position: absolute;
	bottom: 6px;
	left: 6px;
	padding: 2px 5px 2px 5px;
	font-size: 11px;
}



.mapshaper-logo {
	font-weight: bold;
	font-size: 18px;
	margin: 2px 0 0 12px;
}

.mapshaper-logo .logo-highlight {
	color: #ffa;
}

.page-header a {
	text-decoration: none;
}

#mode-buttons {
	z-index: 20;
	position: absolute;
	top: 0px;
	right: 0px;
	display: none;
	margin: 0 8px 3px 0;
}

.separator {
	border-left: 1px solid white;
	height: 10px;
	margin: 0 2px 0 2px;
}

/* --- Export dialog --------- */

#export-options .dialog-btn {
	min-width: 20px;
	padding: 4px 6px 5px 6px;
}

#export-layer-list {
	max-height: 160px;
	overflow: hidden;
	overflow-y: auto;
	margin-right: -13px;
}

#export-layer-list > div {
	white-space: nowrap;
}

#export-options .option-menu .advanced-options {
	width: 190px;
}

/* --- Main area ------------- */

.main-area {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	margin: 32px 0 0 0;	
}


/* --- Error message ---------- */

.error-wrapper {
	z-index: 120;
	text-align: center;
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
}

div.error-box {
	margin-top: 55px;
	/* padding: 8px 12px 10px 12px; */
	max-width: 400px;
	font-size: 16px;
}

div.error-box > div {

}


/* --- Import screen -------------- */

#fork-me {
	background-image: url("images/fork-me-right-graphite@2x.png");
    background-size: 149px 149px;
	position: absolute;
	z-index: 110;
	top: 0;
	right: 0;
	border: 0;
	width: 149px;
	height: 149px;
}

.option-menu .advanced-options {
	width: 210px;
	background: rgba(255, 255, 255, 0.4);
	border: 1px solid #999;
	padding: 0 3px;
	height: 17px;
	font-size: 12px;
}

#mshp-not-supported {
	display: none;
	z-index: 100;
	text-align: center;
}

#dropped-file-list {
	display: none;
	padding-bottom: 3px;
}

#dropped-file-list p {
	line-height: 1;
	margin-bottom: 5px;
}

.popup-dialog {
	display: none;
	z-index: 80;	
	text-align: center;
}

.info-box {
	text-align: left;
	margin-top: 12px;
	background-color: #fff;
	padding: 10px 14px 8px 14px;
	vertical-align: top;
	display: inline-block;
	border: 1px solid #999;
	border-radius: 9px;
}

.info-box h3 {
	font-size: 1.2em;
	padding: 0;
	margin: 0 0 2px 0;
}

.info-box h4 {
	font-size: 1em;
	margin: 0 0 1px 0;
}

.info-box p {
	white-space: pre-line;
	margin: 0 0 0.5em 0;
}

.option-menu {
	padding: 0 0 7px 0;
}

.option-menu input {
	width: 12px;
	height: 12px;
}

.option-menu .tip-button {
	margin-left: 12px;
	margin-top: 3px;
}

.option-menu input.checkbox {
	margin: 3px 5px 0 0;
}

.option-menu input.radio {
	margin: 0 5px 0 0;
}

/* --- Progress bar --------------- */

#progress-message {
	position: absolute;
	width: 100%;
	z-index: 90;
	text-align: center;
	top: 52px;
}

#progress-message > div {
	display: inline-block;
	text-transform: uppercase;
	padding: 3px 6px;
	font-size: 15px;
	color: black;
	background-color: rgba(255, 255, 222, 0.85);
	border: 1px solid #333;
}

/* === Editing interface ========== */

#mshp-main-page {
	position: relative;
	height: 100%;
	width: 100%;
}


/* --- Console control ------------ */

#console {
	z-index: 30;
	pointer-events: none;
	display: none;
}

#console-window {
	pointer-events: auto;
	background-color: rgba(0,0,0,1);
	position: absolute;
	width: 100%;
	text-align: center;
	overflow: auto;
	max-height: 80%;
}

#console-buffer {
	cursor: text;
	width: 100%;
	position: relative;
	color: white;
	font: 13px/1.35 monospace;
	margin: 8px 0 10px 0;
	word-break: break-all;
	word-wrap: break-word;
	white-space: pre; /* Chrome breaks right at line end */
}

@-moz-document url-prefix() {
	#console-buffer {
		white-space: pre-wrap; /* Firefox breaks right at line end */
	}
}

#console-buffer > div {
	text-align: left;
	max-width: 640px;
	margin: 0 auto;
	padding-left: 13%;
	padding-right: 2%;
}

.console-error {
	color: #f93b00;
}

.console-message {
	color: #eddd98;
}

.console-example {
	color: #b9dffc;
}

.input-field {
	outline: none;
	min-width: 100px;
}

/* --- Layer menu ----------- */

#layer-control-btn {
	top: 0;
	position: absolute;
	text-align: center;
	z-index: 10;
	width: 100%;
}

body.simplify #layer-control-btn {
	display: none;
}

#layer-menu .info-box {
	max-height: 90%;
	overflow: hidden;
	overflow-y: auto;

}


#layer-menu .layer-list {
	margin: 6px 0 6px 0;
}

#layer-menu .layer-item {
	position: relative;
	margin-left: -14px;
	margin-right: 9px;
	padding: 8px 14px;
	cursor: pointer;
	width: 100%;
}

.layer-item img {
	position: absolute;
	top: 8px;
	opacity: 0.35;
	right: 8px;
	width: 16px;
	height: 16px;
	padding: 2px;
}

.layer-item img:hover {
	opacity: 1;
}

.layer-item .row {
	line-height: 18px;
	margin-bottom: 1px;
	white-space: nowrap;
}

.layer-item .layer-name {
	display: inline-block;
	min-height: 14px; /* For FF when content is empty */
	min-width: 2px;
	outline: none;
}

.layer-item .layer-name.editing {
	border-bottom: 1px solid transparent;
}

.layer-item .layer-name::selection {
	background: black;
	color: white;
	text-decoration: none;
}

.layer-item .layer-name::-moz-selection {
	background: black;
	color: white;
	text-decoration: none;
}

.layer-item:hover:not(.active) {
	background-color: #f7f7f7;
}

.layer-item .row > div {
	display: inline-block;
}

.layer-item .col1 {
	width: 84px;
}

.layer-item .col2 {
	/*position: relative;
	left: 12px;
	*/
}

/* --- Intersection control ----------*/

#intersection-display {
	cursor: default;
	visibility: visible;
	display: none;
	position: absolute;
	z-index: 20;
	top: 9px;
	left: 12px;
}

#intersection-display .text-btn.disabled {
	visibility: hidden;
}

/* --- Popup -------------------- */

.popup {
	box-sizing: border-box;
	position: absolute;
	z-index: 40;
	top: 12px;
	left: 12px;
	background-color: white;
	border: 1px solid #999;
	border-radius: 9px;
	padding: 5px 0;
}

.popup > div {
	box-sizing: border-box;
	overflow: hidden;
	overflow-y: auto;
	padding: 4px 12px;
	line-height: 1.2;
	font-size: 13px;
}

.popup table {
	border-spacing: 0px;
}

.popup td {
	vertical-align: top;
	padding: 2px 0;
	/*font-weight: bold;*/
	min-width: 80px;
	max-width: 180px;
	color: black;
}

.popup td.field-name {
	color: #aaa;
	padding-right: 7px;
	font-weight: normal;
	min-width: 60px;
}

.popup .num-field {
	font-style: italic;
}

.popup .empty {
	min-width: 4px;
	min-height: 10px;
	display: inline-block;
}

.popup .null-value {
	color: #aaa;
}

.popup .note {
	font-style: italic;
	text-align: right;
}

.popup .value {
	outline: none;
	word-wrap: break-word;
}

.popup .editable-cell .value.editing {
	color: black;
	border-bottom: none;
}

.popup .editable-cell .value::selection {
	color: white;
	background: black;
}

.popup .editable-cell .value::-moz-selection {
	color: white;
	background: black;
}


/* --- Map ---------------------- */

#map-layers {
	height: 100%;
}

#mshp-main-map {
	background-color: #fff;
}

#map-layers.hover {
	cursor: pointer;
}

#map-layers canvas {
	pointer-events: none;
	position: absolute;
}

#map-layers canvas.retina {
	transform-origin: top left;
	-webkit-transform-origin: top left;
	transform: scale3D(0.5, 0.5, 1);
	-webkit-transform: scale3D(0.5, 0.5, 1);
}

#nav-buttons {
	display: none;
	z-index: 20;
	position: absolute;
	top: 6px;
	right: 9px;
	padding: 2px;
	background-color: rgba(255, 255, 255, 0.85);
}

.nav-btn {
	cursor:pointer;
	padding: 3px;
	line-height: 1;
}


.nav-btn:hover * {
	fill: black;
}

.nav-btn.selected * {
	fill: white;
}

.nav-btn.selected {
	background-color: black;
	border-radius: 4px;
}

.zoom-box {
	position: absolute;
	border: 1px solid #f74b80;
	z-index: 15;
}


/* Simplification control ------------ */

@media (max-width: 765px) {
	body.simplify  #simplify-control-wrapper {
		top: 22px;
	}

	body.simplify .page-header {
		height: 52px;
	}

	body.simplify .main-area {
		margin-top: 52px;
	}
}

#simplify-control-wrapper {
	display: none;
	position: absolute;
	width: 100%;
	overflow: hidden;
	margin: 0 auto 0 auto;
	top: 0px;
}

#simplify-control {
	text-align: center;
	white-space: nowrap;
	padding: 0 90px 0 12px;
}

#simplify-control .slider {
	margin: 15px 5px 0 3px;
	position: relative;
	vertical-align: top;
	display: inline-block;
}

#simplify-control .track {   	
  	border-radius: 2px;
	width: 340px;
	background-color: #fff;
	height: 2px;
}

#simplify-control .handle {
	position: absolute;
	top: -3px;
}

#simplify-control .handle img {
	width: 20px;
	height: 20px;
	margin-left: -10px;
	margin-top: -10px;
}

#simplify-control .clicktext {
	width: 56px;
	background: rgba(255, 255, 255, 0.5);
	text-align: center;
	border: 1px solid rgba(0,0,0,0);
	font-size: 13px;
}

#simplify-control .clicktext:focus {
	background: #fff;
}


================================================
FILE: pako.deflate.js
================================================
/* pako 0.2.7 nodeca/pako */
!function(t){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=t();else if("function"==typeof define&&define.amd)define([],t);else{var e;e="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this,e.pako=t()}}(function(){return function t(e,a,n){function r(s,h){if(!a[s]){if(!e[s]){var l="function"==typeof require&&require;if(!h&&l)return l(s,!0);if(i)return i(s,!0);var o=new Error("Cannot find module '"+s+"'");throw o.code="MODULE_NOT_FOUND",o}var _=a[s]={exports:{}};e[s][0].call(_.exports,function(t){var a=e[s][1][t];return r(a?a:t)},_,_.exports,t,e,a,n)}return a[s].exports}for(var i="function"==typeof require&&require,s=0;s<n.length;s++)r(n[s]);return r}({1:[function(t,e,a){"use strict";var n="undefined"!=typeof Uint8Array&&"undefined"!=typeof Uint16Array&&"undefined"!=typeof Int32Array;a.assign=function(t){for(var e=Array.prototype.slice.call(arguments,1);e.length;){var a=e.shift();if(a){if("object"!=typeof a)throw new TypeError(a+"must be non-object");for(var n in a)a.hasOwnProperty(n)&&(t[n]=a[n])}}return t},a.shrinkBuf=function(t,e){return t.length===e?t:t.subarray?t.subarray(0,e):(t.length=e,t)};var r={arraySet:function(t,e,a,n,r){if(e.subarray&&t.subarray)return void t.set(e.subarray(a,a+n),r);for(var i=0;n>i;i++)t[r+i]=e[a+i]},flattenChunks:function(t){var e,a,n,r,i,s;for(n=0,e=0,a=t.length;a>e;e++)n+=t[e].length;for(s=new Uint8Array(n),r=0,e=0,a=t.length;a>e;e++)i=t[e],s.set(i,r),r+=i.length;return s}},i={arraySet:function(t,e,a,n,r){for(var i=0;n>i;i++)t[r+i]=e[a+i]},flattenChunks:function(t){return[].concat.apply([],t)}};a.setTyped=function(t){t?(a.Buf8=Uint8Array,a.Buf16=Uint16Array,a.Buf32=Int32Array,a.assign(a,r)):(a.Buf8=Array,a.Buf16=Array,a.Buf32=Array,a.assign(a,i))},a.setTyped(n)},{}],2:[function(t,e,a){"use strict";function n(t,e){if(65537>e&&(t.subarray&&s||!t.subarray&&i))return String.fromCharCode.apply(null,r.shrinkBuf(t,e));for(var a="",n=0;e>n;n++)a+=String.fromCharCode(t[n]);return a}var r=t("./common"),i=!0,s=!0;try{String.fromCharCode.apply(null,[0])}catch(h){i=!1}try{String.fromCharCode.apply(null,new Uint8Array(1))}catch(h){s=!1}for(var l=new r.Buf8(256),o=0;256>o;o++)l[o]=o>=252?6:o>=248?5:o>=240?4:o>=224?3:o>=192?2:1;l[254]=l[254]=1,a.string2buf=function(t){var e,a,n,i,s,h=t.length,l=0;for(i=0;h>i;i++)a=t.charCodeAt(i),55296===(64512&a)&&h>i+1&&(n=t.charCodeAt(i+1),56320===(64512&n)&&(a=65536+(a-55296<<10)+(n-56320),i++)),l+=128>a?1:2048>a?2:65536>a?3:4;for(e=new r.Buf8(l),s=0,i=0;l>s;i++)a=t.charCodeAt(i),55296===(64512&a)&&h>i+1&&(n=t.charCodeAt(i+1),56320===(64512&n)&&(a=65536+(a-55296<<10)+(n-56320),i++)),128>a?e[s++]=a:2048>a?(e[s++]=192|a>>>6,e[s++]=128|63&a):65536>a?(e[s++]=224|a>>>12,e[s++]=128|a>>>6&63,e[s++]=128|63&a):(e[s++]=240|a>>>18,e[s++]=128|a>>>12&63,e[s++]=128|a>>>6&63,e[s++]=128|63&a);return e},a.buf2binstring=function(t){return n(t,t.length)},a.binstring2buf=function(t){for(var e=new r.Buf8(t.length),a=0,n=e.length;n>a;a++)e[a]=t.charCodeAt(a);return e},a.buf2string=function(t,e){var a,r,i,s,h=e||t.length,o=new Array(2*h);for(r=0,a=0;h>a;)if(i=t[a++],128>i)o[r++]=i;else if(s=l[i],s>4)o[r++]=65533,a+=s-1;else{for(i&=2===s?31:3===s?15:7;s>1&&h>a;)i=i<<6|63&t[a++],s--;s>1?o[r++]=65533:65536>i?o[r++]=i:(i-=65536,o[r++]=55296|i>>10&1023,o[r++]=56320|1023&i)}return n(o,r)},a.utf8border=function(t,e){var a;for(e=e||t.length,e>t.length&&(e=t.length),a=e-1;a>=0&&128===(192&t[a]);)a--;return 0>a?e:0===a?e:a+l[t[a]]>e?a:e}},{"./common":1}],3:[function(t,e,a){"use strict";function n(t,e,a,n){for(var r=65535&t|0,i=t>>>16&65535|0,s=0;0!==a;){s=a>2e3?2e3:a,a-=s;do r=r+e[n++]|0,i=i+r|0;while(--s);r%=65521,i%=65521}return r|i<<16|0}e.exports=n},{}],4:[function(t,e,a){"use strict";function n(){for(var t,e=[],a=0;256>a;a++){t=a;for(var n=0;8>n;n++)t=1&t?3988292384^t>>>1:t>>>1;e[a]=t}return e}function r(t,e,a,n){var r=i,s=n+a;t=-1^t;for(var h=n;s>h;h++)t=t>>>8^r[255&(t^e[h])];return-1^t}var i=n();e.exports=r},{}],5:[function(t,e,a){"use strict";function n(t,e){return t.msg=I[e],e}function r(t){return(t<<1)-(t>4?9:0)}function i(t){for(var e=t.length;--e>=0;)t[e]=0}function s(t){var e=t.state,a=e.pending;a>t.avail_out&&(a=t.avail_out),0!==a&&(S.arraySet(t.output,e.pending_buf,e.pending_out,a,t.next_out),t.next_out+=a,e.pending_out+=a,t.total_out+=a,t.avail_out-=a,e.pending-=a,0===e.pending&&(e.pending_out=0))}function h(t,e){j._tr_flush_block(t,t.block_start>=0?t.block_start:-1,t.strstart-t.block_start,e),t.block_start=t.strstart,s(t.strm)}function l(t,e){t.pending_buf[t.pending++]=e}function o(t,e){t.pending_buf[t.pending++]=e>>>8&255,t.pending_buf[t.pending++]=255&e}function _(t,e,a,n){var r=t.avail_in;return r>n&&(r=n),0===r?0:(t.avail_in-=r,S.arraySet(e,t.input,t.next_in,r,a),1===t.state.wrap?t.adler=E(t.adler,e,r,a):2===t.state.wrap&&(t.adler=U(t.adler,e,r,a)),t.next_in+=r,t.total_in+=r,r)}function d(t,e){var 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n=t.prev[--e],t.prev[e]=n>=s?n-s:0;while(--a);r+=s}if(0===t.strm.avail_in)break;if(a=_(t.strm,t.window,t.strstart+t.lookahead,r),t.lookahead+=a,t.lookahead+t.insert>=ht)for(i=t.strstart-t.insert,t.ins_h=t.window[i],t.ins_h=(t.ins_h<<t.hash_shift^t.window[i+1])&t.hash_mask;t.insert&&(t.ins_h=(t.ins_h<<t.hash_shift^t.window[i+ht-1])&t.hash_mask,t.prev[i&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=i,i++,t.insert--,!(t.lookahead+t.insert<ht)););}while(t.lookahead<ot&&0!==t.strm.avail_in)}function f(t,e){var a=65535;for(a>t.pending_buf_size-5&&(a=t.pending_buf_size-5);;){if(t.lookahead<=1){if(u(t),0===t.lookahead&&e===D)return bt;if(0===t.lookahead)break}t.strstart+=t.lookahead,t.lookahead=0;var n=t.block_start+a;if((0===t.strstart||t.strstart>=n)&&(t.lookahead=t.strstart-n,t.strstart=n,h(t,!1),0===t.strm.avail_out))return bt;if(t.strstart-t.block_start>=t.w_size-ot&&(h(t,!1),0===t.strm.avail_out))return bt}return t.insert=0,e===T?(h(t,!0),0===t.strm.avail_out?wt:yt):t.strstart>t.block_start&&(h(t,!1),0===t.strm.avail_out)?bt:bt}function c(t,e){for(var a,n;;){if(t.lookahead<ot){if(u(t),t.lookahead<ot&&e===D)return bt;if(0===t.lookahead)break}if(a=0,t.lookahead>=ht&&(t.ins_h=(t.ins_h<<t.hash_shift^t.window[t.strstart+ht-1])&t.hash_mask,a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart),0!==a&&t.strstart-a<=t.w_size-ot&&(t.match_length=d(t,a)),t.match_length>=ht)if(n=j._tr_tally(t,t.strstart-t.match_start,t.match_length-ht),t.lookahead-=t.match_length,t.match_length<=t.max_lazy_match&&t.lookahead>=ht){t.match_length--;do t.strstart++,t.ins_h=(t.ins_h<<t.hash_shift^t.window[t.strstart+ht-1])&t.hash_mask,a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart;while(0!==--t.match_length);t.strstart++}else t.strstart+=t.match_length,t.match_length=0,t.ins_h=t.window[t.strstart],t.ins_h=(t.ins_h<<t.hash_shift^t.window[t.strstart+1])&t.hash_mask;else n=j._tr_tally(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++;if(n&&(h(t,!1),0===t.strm.avail_out))return bt}return t.insert=t.strstart<ht-1?t.strstart:ht-1,e===T?(h(t,!0),0===t.strm.avail_out?wt:yt):t.last_lit&&(h(t,!1),0===t.strm.avail_out)?bt:vt}function g(t,e){for(var a,n,r;;){if(t.lookahead<ot){if(u(t),t.lookahead<ot&&e===D)return bt;if(0===t.lookahead)break}if(a=0,t.lookahead>=ht&&(t.ins_h=(t.ins_h<<t.hash_shift^t.window[t.strstart+ht-1])&t.hash_mask,a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart),t.prev_length=t.match_length,t.prev_match=t.match_start,t.match_length=ht-1,0!==a&&t.prev_length<t.max_lazy_match&&t.strstart-a<=t.w_size-ot&&(t.match_length=d(t,a),t.match_length<=5&&(t.strategy===P||t.match_length===ht&&t.strstart-t.match_start>4096)&&(t.match_length=ht-1)),t.prev_length>=ht&&t.match_length<=t.prev_length){r=t.strstart+t.lookahead-ht,n=j._tr_tally(t,t.strstart-1-t.prev_match,t.prev_length-ht),t.lookahead-=t.prev_length-1,t.prev_length-=2;do++t.strstart<=r&&(t.ins_h=(t.ins_h<<t.hash_shift^t.window[t.strstart+ht-1])&t.hash_mask,a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart);while(0!==--t.prev_length);if(t.match_available=0,t.match_length=ht-1,t.strstart++,n&&(h(t,!1),0===t.strm.avail_out))return bt}else if(t.match_available){if(n=j._tr_tally(t,0,t.window[t.strstart-1]),n&&h(t,!1),t.strstart++,t.lookahead--,0===t.strm.avail_out)return bt}else t.match_available=1,t.strstart++,t.lookahead--}return t.match_available&&(n=j._tr_tally(t,0,t.window[t.strstart-1]),t.match_available=0),t.insert=t.strstart<ht-1?t.strstart:ht-1,e===T?(h(t,!0),0===t.strm.avail_out?wt:yt):t.last_lit&&(h(t,!1),0===t.strm.avail_out)?bt:vt}function p(t,e){for(var a,n,r,i,s=t.window;;){if(t.lookahead<=lt){if(u(t),t.lookahead<=lt&&e===D)return bt;if(0===t.lookahead)break}if(t.match_length=0,t.lookahead>=ht&&t.strstart>0&&(r=t.strstart-1,n=s[r],n===s[++r]&&n===s[++r]&&n===s[++r])){i=t.strstart+lt;do;while(n===s[++r]&&n===s[++r]&&n===s[++r]&&n===s[++r]&&n===s[++r]&&n===s[++r]&&n===s[++r]&&n===s[++r]&&i>r);t.match_length=lt-(i-r),t.match_length>t.lookahead&&(t.match_length=t.lookahead)}if(t.match_length>=ht?(a=j._tr_tally(t,1,t.match_length-ht),t.lookahead-=t.match_length,t.strstart+=t.match_length,t.match_length=0):(a=j._tr_tally(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++),a&&(h(t,!1),0===t.strm.avail_out))return bt}return t.insert=0,e===T?(h(t,!0),0===t.strm.avail_out?wt:yt):t.last_lit&&(h(t,!1),0===t.strm.avail_out)?bt:vt}function m(t,e){for(var a;;){if(0===t.lookahead&&(u(t),0===t.lookahead)){if(e===D)return bt;break}if(t.match_length=0,a=j._tr_tally(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++,a&&(h(t,!1),0===t.strm.avail_out))return bt}return t.insert=0,e===T?(h(t,!0),0===t.strm.avail_out?wt:yt):t.last_lit&&(h(t,!1),0===t.strm.avail_out)?bt:vt}function b(t){t.window_size=2*t.w_size,i(t.head),t.max_lazy_match=C[t.level].max_lazy,t.good_match=C[t.level].good_length,t.nice_match=C[t.level].nice_length,t.max_chain_length=C[t.level].max_chain,t.strstart=0,t.block_start=0,t.lookahead=0,t.insert=0,t.match_length=t.prev_length=ht-1,t.match_available=0,t.ins_h=0}function v(){this.strm=null,this.status=0,this.pending_buf=null,this.pending_buf_size=0,this.pending_out=0,this.pending=0,this.wrap=0,this.gzhead=null,this.gzindex=0,this.method=X,this.last_flush=-1,this.w_size=0,this.w_bits=0,this.w_mask=0,this.window=null,this.window_size=0,this.prev=null,this.head=null,this.ins_h=0,this.hash_size=0,this.hash_bits=0,this.hash_mask=0,this.hash_shift=0,this.block_start=0,this.match_length=0,this.prev_match=0,this.match_available=0,this.strstart=0,this.match_start=0,this.lookahead=0,this.prev_length=0,this.max_chain_length=0,this.max_lazy_match=0,this.level=0,this.strategy=0,this.good_match=0,this.nice_match=0,this.dyn_ltree=new S.Buf16(2*it),this.dyn_dtree=new S.Buf16(2*(2*nt+1)),this.bl_tree=new S.Buf16(2*(2*rt+1)),i(this.dyn_ltree),i(this.dyn_dtree),i(this.bl_tree),this.l_desc=null,this.d_desc=null,this.bl_desc=null,this.bl_count=new S.Buf16(st+1),this.heap=new S.Buf16(2*at+1),i(this.heap),this.heap_len=0,this.heap_max=0,this.depth=new S.Buf16(2*at+1),i(this.depth),this.l_buf=0,this.lit_bufsize=0,this.last_lit=0,this.d_buf=0,this.opt_len=0,this.static_len=0,this.matches=0,this.insert=0,this.bi_buf=0,this.bi_valid=0}function w(t){var e;return t&&t.state?(t.total_in=t.total_out=0,t.data_type=W,e=t.state,e.pending=0,e.pending_out=0,e.wrap<0&&(e.wrap=-e.wrap),e.status=e.wrap?dt:pt,t.adler=2===e.wrap?0:1,e.last_flush=D,j._tr_init(e),N):n(t,H)}function y(t){var e=w(t);return e===N&&b(t.state),e}function z(t,e){return t&&t.state?2!==t.state.wrap?H:(t.state.gzhead=e,N):H}function k(t,e,a,r,i,s){if(!t)return H;var h=1;if(e===M&&(e=6),0>r?(h=0,r=-r):r>15&&(h=2,r-=16),1>i||i>Y||a!==X||8>r||r>15||0>e||e>9||0>s||s>Q)return n(t,H);8===r&&(r=9);var l=new v;return t.state=l,l.strm=t,l.wrap=h,l.gzhead=null,l.w_bits=r,l.w_size=1<<l.w_bits,l.w_mask=l.w_size-1,l.hash_bits=i+7,l.hash_size=1<<l.hash_bits,l.hash_mask=l.hash_size-1,l.hash_shift=~~((l.hash_bits+ht-1)/ht),l.window=new S.Buf8(2*l.w_size),l.head=new S.Buf16(l.hash_size),l.prev=new S.Buf16(l.w_size),l.lit_bufsize=1<<i+6,l.pending_buf_size=4*l.lit_bufsize,l.pending_buf=new S.Buf8(l.pending_buf_size),l.d_buf=l.lit_bufsize>>1,l.l_buf=3*l.lit_bufsize,l.level=e,l.strategy=s,l.method=a,y(t)}function x(t,e){return k(t,e,X,Z,$,V)}function B(t,e){var a,h,_,d;if(!t||!t.state||e>L||0>e)return t?n(t,H):H;if(h=t.state,!t.output||!t.input&&0!==t.avail_in||h.status===mt&&e!==T)return n(t,0===t.avail_out?K:H);if(h.strm=t,a=h.last_flush,h.last_flush=e,h.status===dt)if(2===h.wrap)t.adler=0,l(h,31),l(h,139),l(h,8),h.gzhead?(l(h,(h.gzhead.text?1:0)+(h.gzhead.hcrc?2:0)+(h.gzhead.extra?4:0)+(h.gzhead.name?8:0)+(h.gzhead.comment?16:0)),l(h,255&h.gzhead.time),l(h,h.gzhead.time>>8&255),l(h,h.gzhead.time>>16&255),l(h,h.gzhead.time>>24&255),l(h,9===h.level?2:h.strategy>=G||h.level<2?4:0),l(h,255&h.gzhead.os),h.gzhead.extra&&h.gzhead.extra.length&&(l(h,255&h.gzhead.extra.length),l(h,h.gzhead.extra.length>>8&255)),h.gzhead.hcrc&&(t.adler=U(t.adler,h.pending_buf,h.pending,0)),h.gzindex=0,h.status=ut):(l(h,0),l(h,0),l(h,0),l(h,0),l(h,0),l(h,9===h.level?2:h.strategy>=G||h.level<2?4:0),l(h,zt),h.status=pt);else{var u=X+(h.w_bits-8<<4)<<8,f=-1;f=h.strategy>=G||h.level<2?0:h.level<6?1:6===h.level?2:3,u|=f<<6,0!==h.strstart&&(u|=_t),u+=31-u%31,h.status=pt,o(h,u),0!==h.strstart&&(o(h,t.adler>>>16),o(h,65535&t.adler)),t.adler=1}if(h.status===ut)if(h.gzhead.extra){for(_=h.pending;h.gzindex<(65535&h.gzhead.extra.length)&&(h.pending!==h.pending_buf_size||(h.gzhead.hcrc&&h.pending>_&&(t.adler=U(t.adler,h.pending_buf,h.pending-_,_)),s(t),_=h.pending,h.pending!==h.pending_buf_size));)l(h,255&h.gzhead.extra[h.gzindex]),h.gzindex++;h.gzhead.hcrc&&h.pending>_&&(t.adler=U(t.adler,h.pending_buf,h.pending-_,_)),h.gzindex===h.gzhead.extra.length&&(h.gzindex=0,h.status=ft)}else h.status=ft;if(h.status===ft)if(h.gzhead.name){_=h.pending;do{if(h.pending===h.pending_buf_size&&(h.gzhead.hcrc&&h.pending>_&&(t.adler=U(t.adler,h.pending_buf,h.pending-_,_)),s(t),_=h.pending,h.pending===h.pending_buf_size)){d=1;break}d=h.gzindex<h.gzhead.name.length?255&h.gzhead.name.charCodeAt(h.gzindex++):0,l(h,d)}while(0!==d);h.gzhead.hcrc&&h.pending>_&&(t.adler=U(t.adler,h.pending_buf,h.pending-_,_)),0===d&&(h.gzindex=0,h.status=ct)}else h.status=ct;if(h.status===ct)if(h.gzhead.comment){_=h.pending;do{if(h.pending===h.pending_buf_size&&(h.gzhead.hcrc&&h.pending>_&&(t.adler=U(t.adler,h.pending_buf,h.pending-_,_)),s(t),_=h.pending,h.pending===h.pending_buf_size)){d=1;break}d=h.gzindex<h.gzhead.comment.length?255&h.gzhead.comment.charCodeAt(h.gzindex++):0,l(h,d)}while(0!==d);h.gzhead.hcrc&&h.pending>_&&(t.adler=U(t.adler,h.pending_buf,h.pending-_,_)),0===d&&(h.status=gt)}else h.status=gt;if(h.status===gt&&(h.gzhead.hcrc?(h.pending+2>h.pending_buf_size&&s(t),h.pending+2<=h.pending_buf_size&&(l(h,255&t.adler),l(h,t.adler>>8&255),t.adler=0,h.status=pt)):h.status=pt),0!==h.pending){if(s(t),0===t.avail_out)return h.last_flush=-1,N}else if(0===t.avail_in&&r(e)<=r(a)&&e!==T)return n(t,K);if(h.status===mt&&0!==t.avail_in)return n(t,K);if(0!==t.avail_in||0!==h.lookahead||e!==D&&h.status!==mt){var c=h.strategy===G?m(h,e):h.strategy===J?p(h,e):C[h.level].func(h,e);if((c===wt||c===yt)&&(h.status=mt),c===bt||c===wt)return 0===t.avail_out&&(h.last_flush=-1),N;if(c===vt&&(e===O?j._tr_align(h):e!==L&&(j._tr_stored_block(h,0,0,!1),e===q&&(i(h.head),0===h.lookahead&&(h.strstart=0,h.block_start=0,h.insert=0))),s(t),0===t.avail_out))return h.last_flush=-1,N}return e!==T?N:h.wrap<=0?R:(2===h.wrap?(l(h,255&t.adler),l(h,t.adler>>8&255),l(h,t.adler>>16&255),l(h,t.adler>>24&255),l(h,255&t.total_in),l(h,t.total_in>>8&255),l(h,t.total_in>>16&255),l(h,t.total_in>>24&255)):(o(h,t.adler>>>16),o(h,65535&t.adler)),s(t),h.wrap>0&&(h.wrap=-h.wrap),0!==h.pending?N:R)}function A(t){var e;return t&&t.state?(e=t.state.status,e!==dt&&e!==ut&&e!==ft&&e!==ct&&e!==gt&&e!==pt&&e!==mt?n(t,H):(t.state=null,e===pt?n(t,F):N)):H}var C,S=t("../utils/common"),j=t("./trees"),E=t("./adler32"),U=t("./crc32"),I=t("./messages"),D=0,O=1,q=3,T=4,L=5,N=0,R=1,H=-2,F=-3,K=-5,M=-1,P=1,G=2,J=3,Q=4,V=0,W=2,X=8,Y=9,Z=15,$=8,tt=29,et=256,at=et+1+tt,nt=30,rt=19,it=2*at+1,st=15,ht=3,lt=258,ot=lt+ht+1,_t=32,dt=42,ut=69,ft=73,ct=91,gt=103,pt=113,mt=666,bt=1,vt=2,wt=3,yt=4,zt=3,kt=function(t,e,a,n,r){this.good_length=t,this.max_lazy=e,this.nice_length=a,this.max_chain=n,this.func=r};C=[new kt(0,0,0,0,f),new kt(4,4,8,4,c),new kt(4,5,16,8,c),new kt(4,6,32,32,c),new kt(4,4,16,16,g),new kt(8,16,32,32,g),new kt(8,16,128,128,g),new kt(8,32,128,256,g),new kt(32,128,258,1024,g),new kt(32,258,258,4096,g)],a.deflateInit=x,a.deflateInit2=k,a.deflateReset=y,a.deflateResetKeep=w,a.deflateSetHeader=z,a.deflate=B,a.deflateEnd=A,a.deflateInfo="pako deflate (from Nodeca project)"},{"../utils/common":1,"./adler32":3,"./crc32":4,"./messages":6,"./trees":7}],6:[function(t,e,a){"use strict";e.exports={2:"need dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"}},{}],7:[function(t,e,a){"use strict";function n(t){for(var e=t.length;--e>=0;)t[e]=0}function r(t){return 256>t?st[t]:st[256+(t>>>7)]}function i(t,e){t.pending_buf[t.pending++]=255&e,t.pending_buf[t.pending++]=e>>>8&255}function s(t,e,a){t.bi_valid>Q-a?(t.bi_buf|=e<<t.bi_valid&65535,i(t,t.bi_buf),t.bi_buf=e>>Q-t.bi_valid,t.bi_valid+=a-Q):(t.bi_buf|=e<<t.bi_valid&65535,t.bi_valid+=a)}function h(t,e,a){s(t,a[2*e],a[2*e+1])}function l(t,e){var a=0;do a|=1&t,t>>>=1,a<<=1;while(--e>0);return a>>>1}function o(t){16===t.bi_valid?(i(t,t.bi_buf),t.bi_buf=0,t.bi_valid=0):t.bi_valid>=8&&(t.pending_buf[t.pending++]=255&t.bi_buf,t.bi_buf>>=8,t.bi_valid-=8)}function _(t,e){var a,n,r,i,s,h,l=e.dyn_tree,o=e.max_code,_=e.stat_desc.static_tree,d=e.stat_desc.has_stree,u=e.stat_desc.extra_bits,f=e.stat_desc.extra_base,c=e.stat_desc.max_length,g=0;for(i=0;J>=i;i++)t.bl_count[i]=0;for(l[2*t.heap[t.heap_max]+1]=0,a=t.heap_max+1;G>a;a++)n=t.heap[a],i=l[2*l[2*n+1]+1]+1,i>c&&(i=c,g++),l[2*n+1]=i,n>o||(t.bl_count[i]++,s=0,n>=f&&(s=u[n-f]),h=l[2*n],t.opt_len+=h*(i+s),d&&(t.static_len+=h*(_[2*n+1]+s)));if(0!==g){do{for(i=c-1;0===t.bl_count[i];)i--;t.bl_count[i]--,t.bl_count[i+1]+=2,t.bl_count[c]--,g-=2}while(g>0);for(i=c;0!==i;i--)for(n=t.bl_count[i];0!==n;)r=t.heap[--a],r>o||(l[2*r+1]!==i&&(t.opt_len+=(i-l[2*r+1])*l[2*r],l[2*r+1]=i),n--)}}function d(t,e,a){var n,r,i=new Array(J+1),s=0;for(n=1;J>=n;n++)i[n]=s=s+a[n-1]<<1;for(r=0;e>=r;r++){var h=t[2*r+1];0!==h&&(t[2*r]=l(i[h]++,h))}}function u(){var t,e,a,n,r,i=new Array(J+1);for(a=0,n=0;H-1>n;n++)for(lt[n]=a,t=0;t<1<<$[n];t++)ht[a++]=n;for(ht[a-1]=n,r=0,n=0;16>n;n++)for(ot[n]=r,t=0;t<1<<tt[n];t++)st[r++]=n;for(r>>=7;M>n;n++)for(ot[n]=r<<7,t=0;t<1<<tt[n]-7;t++)st[256+r++]=n;for(e=0;J>=e;e++)i[e]=0;for(t=0;143>=t;)rt[2*t+1]=8,t++,i[8]++;for(;255>=t;)rt[2*t+1]=9,t++,i[9]++;for(;279>=t;)rt[2*t+1]=7,t++,i[7]++;for(;287>=t;)rt[2*t+1]=8,t++,i[8]++;for(d(rt,K+1,i),t=0;M>t;t++)it[2*t+1]=5,it[2*t]=l(t,5);_t=new ft(rt,$,F+1,K,J),dt=new ft(it,tt,0,M,J),ut=new ft(new Array(0),et,0,P,V)}function f(t){var e;for(e=0;K>e;e++)t.dyn_ltree[2*e]=0;for(e=0;M>e;e++)t.dyn_dtree[2*e]=0;for(e=0;P>e;e++)t.bl_tree[2*e]=0;t.dyn_ltree[2*W]=1,t.opt_len=t.static_len=0,t.last_lit=t.matches=0}function c(t){t.bi_valid>8?i(t,t.bi_buf):t.bi_valid>0&&(t.pending_buf[t.pending++]=t.bi_buf),t.bi_buf=0,t.bi_valid=0}function 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================================================
FILE: pako.inflate.js
================================================
/* pako 0.2.7 nodeca/pako */
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ae:for(;Be=i.distcode[h&(1<<i.distbits)-1],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(c>=me);){if(0===f)break e;f--,h+=a[o++]<<c,c+=8}if(0===(240&ke)){for(ge=me,ve=ke,pe=_e;Be=i.distcode[pe+((h&(1<<ge+ve)-1)>>ge)],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(c>=ge+me);){if(0===f)break e;f--,h+=a[o++]<<c,c+=8}h>>>=ge,c-=ge,i.back+=ge}if(h>>>=me,c-=me,i.back+=me,64&ke){e.msg="invalid distance code",i.mode=ue;break}i.offset=_e,i.extra=15&ke,i.mode=re;case re:if(i.extra){for(Ee=i.extra;Ee>c;){if(0===f)break e;f--,h+=a[o++]<<c,c+=8}i.offset+=h&(1<<i.extra)-1,h>>>=i.extra,c-=i.extra,i.back+=i.extra}if(i.offset>i.dmax){e.msg="invalid distance too far back",i.mode=ue;break}i.mode=oe;case oe:if(0===l)break e;if(m=w-l,i.offset>m){if(m=i.offset-m,m>i.whave&&i.sane){e.msg="invalid distance too far back",i.mode=ue;break}m>i.wnext?(m-=i.wnext,be=i.wsize-m):be=i.wnext-m,m>i.length&&(m=i.length),we=i.window}else we=r,be=s-i.offset,m=i.length;m>l&&(m=l),l-=m,i.length-=m;do r[s++]=we[be++];while(--m);0===i.length&&(i.mode=ie);break;case se:if(0===l)break e;r[s++]=i.length,l--,i.mode=ie;break;case fe:if(i.wrap){for(;32>c;){if(0===f)break e;f--,h|=a[o++]<<c,c+=8}if(w-=l,e.total_out+=w,i.total+=w,w&&(e.adler=i.check=i.flags?g(i.check,r,w,s-w):_(i.check,r,w,s-w)),w=l,(i.flags?h:n(h))!==i.check){e.msg="incorrect data check",i.mode=ue;break}h=0,c=0}i.mode=le;case le:if(i.wrap&&i.flags){for(;32>c;){if(0===f)break e;f--,h+=a[o++]<<c,c+=8}if(h!==(4294967295&i.total)){e.msg="incorrect length check",i.mode=ue;break}h=0,c=0}i.mode=de;case de:ye=z;break e;case ue:ye=C;break e;case he:return O;case ce:default:return R}return e.next_out=s,e.avail_out=l,e.next_in=o,e.avail_in=f,i.hold=h,i.bits=c,(i.wsize||w!==e.avail_out&&i.mode<ue&&(i.mode<fe||t!==E))&&u(e,e.output,e.next_out,w-e.avail_out)?(i.mode=he,O):(b-=e.avail_in,w-=e.avail_out,e.total_in+=b,e.total_out+=w,i.total+=w,i.wrap&&w&&(e.adler=i.check=i.flags?g(i.check,r,w,e.next_out-w):_(i.check,r,w,e.next_out-w)),e.data_type=i.bits+(i.last?64:0)+(i.mode===G?128:0)+(i.mode===te||i.mode===J?256:0),(0===b&&0===w||t===E)&&ye===A&&(ye=I),ye)}function c(e){if(!e||!e.state)return R;var t=e.state;return t.window&&(t.window=null),e.state=null,A}function b(e,t){var i;return e&&e.state?(i=e.state,0===(2&i.wrap)?R:(i.head=t,t.done=!1,A)):R}var w,m,k=e("../utils/common"),_=e("./adler32"),g=e("./crc32"),v=e("./inffast"),p=e("./inftrees"),x=0,y=1,S=2,E=4,B=5,Z=6,A=0,z=1,N=2,R=-2,C=-3,O=-4,I=-5,T=8,F=1,U=2,D=3,L=4,H=5,j=6,M=7,K=8,P=9,Y=10,q=11,G=12,X=13,W=14,J=15,Q=16,V=17,$=18,ee=19,te=20,ie=21,ne=22,ae=23,re=24,oe=25,se=26,fe=27,le=28,de=29,ue=30,he=31,ce=32,be=852,we=592,me=15,ke=me,_e=!0;i.inflateReset=o,i.inflateReset2=s,i.inflateResetKeep=r,i.inflateInit=l,i.inflateInit2=f,i.inflate=h,i.inflateEnd=c,i.inflateGetHeader=b,i.inflateInfo="pako inflate (from Nodeca project)"},{"../utils/common":1,"./adler32":3,"./crc32":5,"./inffast":7,"./inftrees":9}],9:[function(e,t,i){"use strict";var n=e("../utils/common"),a=15,r=852,o=592,s=0,f=1,l=2,d=[3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0],u=[16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,72,78],h=[1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0],c=[16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64];t.exports=function(e,t,i,b,w,m,k,_){var g,v,p,x,y,S,E,B,Z,A=_.bits,z=0,N=0,R=0,C=0,O=0,I=0,T=0,F=0,U=0,D=0,L=null,H=0,j=new n.Buf16(a+1),M=new n.Buf16(a+1),K=null,P=0;for(z=0;a>=z;z++)j[z]=0;for(N=0;b>N;N++)j[t[i+N]]++;for(O=A,C=a;C>=1&&0===j[C];C--);if(O>C&&(O=C),0===C)return w[m++]=20971520,w[m++]=20971520,_.bits=1,0;for(R=1;C>R&&0===j[R];R++);for(R>O&&(O=R),F=1,z=1;a>=z;z++)if(F<<=1,F-=j[z],0>F)return-1;if(F>0&&(e===s||1!==C))return-1;for(M[1]=0,z=1;a>z;z++)M[z+1]=M[z]+j[z];for(N=0;b>N;N++)0!==t[i+N]&&(k[M[t[i+N]]++]=N);if(e===s?(L=K=k,S=19):e===f?(L=d,H-=257,K=u,P-=257,S=256):(L=h,K=c,S=-1),D=0,N=0,z=R,y=m,I=O,T=0,p=-1,U=1<<O,x=U-1,e===f&&U>r||e===l&&U>o)return 1;for(var Y=0;;){Y++,E=z-T,k[N]<S?(B=0,Z=k[N]):k[N]>S?(B=K[P+k[N]],Z=L[H+k[N]]):(B=96,Z=0),g=1<<z-T,v=1<<I,R=v;do v-=g,w[y+(D>>T)+v]=E<<24|B<<16|Z|0;while(0!==v);for(g=1<<z-1;D&g;)g>>=1;if(0!==g?(D&=g-1,D+=g):D=0,N++,0===--j[z]){if(z===C)break;z=t[i+k[N]]}if(z>O&&(D&x)!==p){for(0===T&&(T=O),y+=R,I=z-T,F=1<<I;C>I+T&&(F-=j[I+T],!(0>=F));)I++,F<<=1;if(U+=1<<I,e===f&&U>r||e===l&&U>o)return 1;p=D&x,w[p]=O<<24|I<<16|y-m|0}}return 0!==D&&(w[y+D]=z-T<<24|64<<16|0),_.bits=O,0}},{"../utils/common":1}],10:[function(e,t,i){"use strict";t.exports={2:"need dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"}},{}],11:[function(e,t,i){"use strict";function n(){this.input=null,this.next_in=0,this.avail_in=0,this.total_in=0,this.output=null,this.next_out=0,this.avail_out=0,this.total_out=0,this.msg="",this.state=null,this.data_type=2,this.adler=0}t.exports=n},{}],"/lib/inflate.js":[function(e,t,i){"use strict";function n(e,t){var i=new c(t);if(i.push(e,!0),i.err)throw i.msg;return i.result}function a(e,t){return t=t||{},t.raw=!0,n(e,t)}var r=e("./zlib/inflate.js"),o=e("./utils/common"),s=e("./utils/strings"),f=e("./zlib/constants"),l=e("./zlib/messages"),d=e("./zlib/zstream"),u=e("./zlib/gzheader"),h=Object.prototype.toString,c=function(e){this.options=o.assign({chunkSize:16384,windowBits:0,to:""},e||{});var t=this.options;t.raw&&t.windowBits>=0&&t.windowBits<16&&(t.windowBits=-t.windowBits,0===t.windowBits&&(t.windowBits=-15)),!(t.windowBits>=0&&t.windowBits<16)||e&&e.windowBits||(t.windowBits+=32),t.windowBits>15&&t.windowBits<48&&0===(15&t.windowBits)&&(t.windowBits|=15),this.err=0,this.msg="",this.ended=!1,this.chunks=[],this.strm=new d,this.strm.avail_out=0;var i=r.inflateInit2(this.strm,t.windowBits);if(i!==f.Z_OK)throw new Error(l[i]);this.header=new u,r.inflateGetHeader(this.strm,this.header)};c.prototype.push=function(e,t){var i,n,a,l,d,u=this.strm,c=this.options.chunkSize;if(this.ended)return!1;n=t===~~t?t:t===!0?f.Z_FINISH:f.Z_NO_FLUSH,"string"==typeof e?u.input=s.binstring2buf(e):"[object ArrayBuffer]"===h.call(e)?u.input=new Uint8Array(e):u.input=e,u.next_in=0,u.avail_in=u.input.length;do{if(0===u.avail_out&&(u.output=new o.Buf8(c),u.next_out=0,u.avail_out=c),i=r.inflate(u,f.Z_NO_FLUSH),i!==f.Z_STREAM_END&&i!==f.Z_OK)return this.onEnd(i),this.ended=!0,!1;u.next_out&&(0===u.avail_out||i===f.Z_STREAM_END||0===u.avail_in&&(n===f.Z_FINISH||n===f.Z_SYNC_FLUSH))&&("string"===this.options.to?(a=s.utf8border(u.output,u.next_out),l=u.next_out-a,d=s.buf2string(u.output,a),u.next_out=l,u.avail_out=c-l,l&&o.arraySet(u.output,u.output,a,l,0),this.onData(d)):this.onData(o.shrinkBuf(u.output,u.next_out)))}while(u.avail_in>0&&i!==f.Z_STREAM_END);return i===f.Z_STREAM_END&&(n=f.Z_FINISH),n===f.Z_FINISH?(i=r.inflateEnd(this.strm),this.onEnd(i),this.ended=!0,i===f.Z_OK):n===f.Z_SYNC_FLUSH?(this.onEnd(f.Z_OK),u.avail_out=0,!0):!0},c.prototype.onData=function(e){this.chunks.push(e)},c.prototype.onEnd=function(e){e===f.Z_OK&&("string"===this.options.to?this.result=this.chunks.join(""):this.result=o.flattenChunks(this.chunks)),this.chunks=[],this.err=e,this.msg=this.strm.msg},i.Inflate=c,i.inflate=n,i.inflateRaw=a,i.ungzip=n},{"./utils/common":1,"./utils/strings":2,"./zlib/constants":4,"./zlib/gzheader":6,"./zlib/inflate.js":8,"./zlib/messages":10,"./zlib/zstream":11}]},{},[])("/lib/inflate.js")});


================================================
FILE: z-worker.js
================================================
/* jshint worker:true */
(function main(global) {
	"use strict";

	if (global.zWorkerInitialized)
		throw new Error('z-worker.js should be run only once');
	global.zWorkerInitialized = true;

	addEventListener("message", function(event) {
		var message = event.data, type = message.type, sn = message.sn;
		var handler = handlers[type];
		if (handler) {
			try {
				handler(message);
			} catch (e) {
				onError(type, sn, e);
			}
		}
		//for debug
		//postMessage({type: 'echo', originalType: type, sn: sn});
	});

	var handlers = {
		importScripts: doImportScripts,
		newTask: newTask,
		append: processData,
		flush: processData,
	};

	// deflater/inflater tasks indexed by serial numbers
	var tasks = {};

	function doImportScripts(msg) {
		if (msg.scripts && msg.scripts.length > 0)
			importScripts.apply(undefined, msg.scripts);
		postMessage({type: 'importScripts'});
	}

	function newTask(msg) {
		var CodecClass = global[msg.codecClass];
		var sn = msg.sn;
		if (tasks[sn])
			throw Error('duplicated sn');
		tasks[sn] =  {
			codec: new CodecClass(msg.options),
			crcInput: msg.crcType === 'input',
			crcOutput: msg.crcType === 'output',
			crc: new Crc32(),
		};
		postMessage({type: 'newTask', sn: sn});
	}

	// performance may not be supported
	var now = global.performance ? global.performance.now.bind(global.performance) : Date.now;

	function processData(msg) {
		var sn = msg.sn, type = msg.type, input = msg.data;
		var task = tasks[sn];
		// allow creating codec on first append
		if (!task && msg.codecClass) {
			newTask(msg);
			task = tasks[sn];
		}
		var isAppend = type === 'append';
		var start = now();
		var output;
		if (isAppend) {
			try {
				output = task.codec.append(input, function onprogress(loaded) {
					postMessage({type: 'progress', sn: sn, loaded: loaded});
				});
			} catch (e) {
				delete tasks[sn];
				throw e;
			}
		} else {
			delete tasks[sn];
			output = task.codec.flush();
		}
		var codecTime = now() - start;

		start = now();
		if (input && task.crcInput)
			task.crc.append(input);
		if (output && task.crcOutput)
			task.crc.append(output);
		var crcTime = now() - start;

		var rmsg = {type: type, sn: sn, codecTime: codecTime, crcTime: crcTime};
		var transferables = [];
		if (output) {
			rmsg.data = output;
			transferables.push(output.buffer);
		}
		if (!isAppend && (task.crcInput || task.crcOutput))
			rmsg.crc = task.crc.get();
		
		// posting a message with transferables will fail on IE10
		try {
			postMessage(rmsg, transferables);
		} catch(ex) {
			postMessage(rmsg); // retry without transferables
		}
	}

	function onError(type, sn, e) {
		var msg = {
			type: type,
			sn: sn,
			error: formatError(e)
		};
		postMessage(msg);
	}

	function formatError(e) {
		return { message: e.message, stack: e.stack };
	}

	// Crc32 code copied from file zip.js
	function Crc32() {
		this.crc = -1;
	}
	Crc32.prototype.append = function append(data) {
		var crc = this.crc | 0, table = this.table;
		for (var offset = 0, len = data.length | 0; offset < len; offset++)
			crc = (crc >>> 8) ^ table[(crc ^ data[offset]) & 0xFF];
		this.crc = crc;
	};
	Crc32.prototype.get = function get() {
		return ~this.crc;
	};
	Crc32.prototype.table = (function() {
		var i, j, t, table = []; // Uint32Array is actually slower than []
		for (i = 0; i < 256; i++) {
			t = i;
			for (j = 0; j < 8; j++)
				if (t & 1)
					t = (t >>> 1) ^ 0xEDB88320;
				else
					t = t >>> 1;
			table[i] = t;
		}
		return table;
	})();

	// "no-op" codec
	function NOOP() {}
	global.NOOP = NOOP;
	NOOP.prototype.append = function append(bytes, onprogress) {
		return bytes;
	};
	NOOP.prototype.flush = function flush() {};
})(this);


================================================
FILE: zip.js
================================================
/*
 Copyright (c) 2013 Gildas Lormeau. All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:

 1. Redistributions of source code must retain the above copyright notice,
 this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in
 the documentation and/or other materials provided with the distribution.

 3. The names of the authors may not be used to endorse or promote products
 derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

(function(obj) {
	"use strict";

	var ERR_BAD_FORMAT = "File format is not recognized.";
	var ERR_CRC = "CRC failed.";
	var ERR_ENCRYPTED = "File contains encrypted entry.";
	var ERR_ZIP64 = "File is using Zip64 (4gb+ file size).";
	var ERR_READ = "Error while reading zip file.";
	var ERR_WRITE = "Error while writing zip file.";
	var ERR_WRITE_DATA = "Error while writing file data.";
	var ERR_READ_DATA = "Error while reading file data.";
	var ERR_DUPLICATED_NAME = "File already exists.";
	var CHUNK_SIZE = 512 * 1024;
	
	var TEXT_PLAIN = "text/plain";

	var appendABViewSupported;
	try {
		appendABViewSupported = new Blob([ new DataView(new ArrayBuffer(0)) ]).size === 0;
	} catch (e) {
	}

	function Crc32() {
		this.crc = -1;
	}
	Crc32.prototype.append = function append(data) {
		var crc = this.crc | 0, table = this.table;
		for (var offset = 0, len = data.length | 0; offset < len; offset++)
			crc = (crc >>> 8) ^ table[(crc ^ data[offset]) & 0xFF];
		this.crc = crc;
	};
	Crc32.prototype.get = function get() {
		return ~this.crc;
	};
	Crc32.prototype.table = (function() {
		var i, j, t, table = []; // Uint32Array is actually slower than []
		for (i = 0; i < 256; i++) {
			t = i;
			for (j = 0; j < 8; j++)
				if (t & 1)
					t = (t >>> 1) ^ 0xEDB88320;
				else
					t = t >>> 1;
			table[i] = t;
		}
		return table;
	})();
	
	// "no-op" codec
	function NOOP() {}
	NOOP.prototype.append = function append(bytes, onprogress) {
		return bytes;
	};
	NOOP.prototype.flush = function flush() {};

	function blobSlice(blob, index, length) {
		if (index < 0 || length < 0 || index + length > blob.size)
			throw new RangeError('offset:' + index + ', length:' + length + ', size:' + blob.size);
		if (blob.slice)
			return blob.slice(index, index + length);
		else if (blob.webkitSlice)
			return blob.webkitSlice(index, index + length);
		else if (blob.mozSlice)
			return blob.mozSlice(index, index + length);
		else if (blob.msSlice)
			return blob.msSlice(index, index + length);
	}

	function getDataHelper(byteLength, bytes) {
		var dataBuffer, dataArray;
		dataBuffer = new ArrayBuffer(byteLength);
		dataArray = new Uint8Array(dataBuffer);
		if (bytes)
			dataArray.set(bytes, 0);
		return {
			buffer : dataBuffer,
			array : dataArray,
			view : new DataView(dataBuffer)
		};
	}

	// Readers
	function Reader() {
	}

	function TextReader(text) {
		var that = this, blobReader;

		function init(callback, onerror) {
			var blob = new Blob([ text ], {
				type : TEXT_PLAIN
			});
			blobReader = new BlobReader(blob);
			blobReader.init(function() {
				that.size = blobReader.size;
				callback();
			}, onerror);
		}

		function readUint8Array(index, length, callback, onerror) {
			blobReader.readUint8Array(index, length, callback, onerror);
		}

		that.size = 0;
		that.init = init;
		that.readUint8Array = readUint8Array;
	}
	TextReader.prototype = new Reader();
	TextReader.prototype.constructor = TextReader;

	function Data64URIReader(dataURI) {
		var that = this, dataStart;

		function init(callback) {
			var dataEnd = dataURI.length;
			while (dataURI.charAt(dataEnd - 1) == "=")
				dataEnd--;
			dataStart = dataURI.indexOf(",") + 1;
			that.size = Math.floor((dataEnd - dataStart) * 0.75);
			callback();
		}

		function readUint8Array(index, length, callback) {
			var i, data = getDataHelper(length);
			var start = Math.floor(index / 3) * 4;
			var end = Math.ceil((index + length) / 3) * 4;
			var bytes = obj.atob(dataURI.substring(start + dataStart, end + dataStart));
			var delta = index - Math.floor(start / 4) * 3;
			for (i = delta; i < delta + length; i++)
				data.array[i - delta] = bytes.charCodeAt(i);
			callback(data.array);
		}

		that.size = 0;
		that.init = init;
		that.readUint8Array = readUint8Array;
	}
	Data64URIReader.prototype = new Reader();
	Data64URIReader.prototype.constructor = Data64URIReader;

	function BlobReader(blob) {
		var that = this;

		function init(callback) {
			that.size = blob.size;
			callback();
		}

		function readUint8Array(index, length, callback, onerror) {
			var reader = new FileReader();
			reader.onload = function(e) {
				callback(new Uint8Array(e.target.result));
			};
			reader.onerror = onerror;
			try {
				reader.readAsArrayBuffer(blobSlice(blob, index, length));
			} catch (e) {
				onerror(e);
			}
		}

		that.size = 0;
		that.init = init;
		that.readUint8Array = readUint8Array;
	}
	BlobReader.prototype = new Reader();
	BlobReader.prototype.constructor = BlobReader;

	// Writers

	function Writer() {
	}
	Writer.prototype.getData = function(callback) {
		callback(this.data);
	};

	function TextWriter(encoding) {
		var that = this, blob;

		function init(callback) {
			blob = new Blob([], {
				type : TEXT_PLAIN
			});
			callback();
		}

		function writeUint8Array(array, callback) {
			blob = new Blob([ blob, appendABViewSupported ? array : array.buffer ], {
				type : TEXT_PLAIN
			});
			callback();
		}

		function getData(callback, onerror) {
			var reader = new FileReader();
			reader.onload = function(e) {
				callback(e.target.result);
			};
			reader.onerror = onerror;
			reader.readAsText(blob, encoding);
		}

		that.init = init;
		that.writeUint8Array = writeUint8Array;
		that.getData = getData;
	}
	TextWriter.prototype = new Writer();
	TextWriter.prototype.constructor = TextWriter;

	function Data64URIWriter(contentType) {
		var that = this, data = "", pending = "";

		function init(callback) {
			data += "data:" + (contentType || "") + ";base64,";
			callback();
		}

		function writeUint8Array(array, callback) {
			var i, delta = pending.length, dataString = pending;
			pending = "";
			for (i = 0; i < (Math.floor((delta + array.length) / 3) * 3) - delta; i++)
				dataString += String.fromCharCode(array[i]);
			for (; i < array.length; i++)
				pending += String.fromCharCode(array[i]);
			if (dataString.length > 2)
				data += obj.btoa(dataString);
			else
				pending = dataString;
			callback();
		}

		function getData(callback) {
			callback(data + obj.btoa(pending));
		}

		that.init = init;
		that.writeUint8Array = writeUint8Array;
		that.getData = getData;
	}
	Data64URIWriter.prototype = new Writer();
	Data64URIWriter.prototype.constructor = Data64URIWriter;

	function BlobWriter(contentType) {
		var blob, that = this;

		function init(callback) {
			blob = new Blob([], {
				type : contentType
			});
			callback();
		}

		function writeUint8Array(array, callback) {
			blob = new Blob([ blob, appendABViewSupported ? array : array.buffer ], {
				type : contentType
			});
			callback();
		}

		function getData(callback) {
			callback(blob);
		}

		that.init = init;
		that.writeUint8Array = writeUint8Array;
		that.getData = getData;
	}
	BlobWriter.prototype = new Writer();
	BlobWriter.prototype.constructor = BlobWriter;

	/** 
	 * inflate/deflate core functions
	 * @param worker {Worker} web worker for the task.
	 * @param initialMessage {Object} initial message to be sent to the worker. should contain
	 *   sn(serial number for distinguishing multiple tasks sent to the worker), and codecClass.
	 *   This function may add more properties before sending.
	 */
	function launchWorkerProcess(worker, initialMessage, reader, writer, offset, size, onprogress, onend, onreaderror, onwriteerror) {
		var chunkIndex = 0, index, outputSize, sn = initialMessage.sn, crc;

		function onflush() {
			worker.removeEventListener('message', onmessage, false);
			onend(outputSize, crc);
		}

		function onmessage(event) {
			var message = event.data, data = message.data, err = message.error;
			if (err) {
				err.toString = function () { return 'Error: ' + this.message; };
				onreaderror(err);
				return;
			}
			if (message.sn !== sn)
				return;
			if (typeof message.codecTime === 'number')
				worker.codecTime += message.codecTime; // should be before onflush()
			if (typeof message.crcTime === 'number')
				worker.crcTime += message.crcTime;

			switch (message.type) {
				case 'append':
					if (data) {
						outputSize += data.length;
						writer.writeUint8Array(data, function() {
							step();
						}, onwriteerror);
					} else
						step();
					break;
				case 'flush':
					crc = message.crc;
					if (data) {
						outputSize += data.length;
						writer.writeUint8Array(data, function() {
							onflush();
						}, onwriteerror);
					} else
						onflush();
					break;
				case 'progress':
					if (onprogress)
						onprogress(index + message.loaded, size);
					break;
				case 'importScripts': //no need to handle here
				case 'newTask':
				case 'echo':
					break;
				default:
					console.warn('zip.js:launchWorkerProcess: unknown message: ', message);
			}
		}

		function step() {
			index = chunkIndex * CHUNK_SIZE;
			if (index < size) {
				reader.readUint8Array(offset + index, Math.min(CHUNK_SIZE, size - index), function(array) {
					if (onprogress)
						onprogress(index, size);
					var msg = index === 0 ? initialMessage : {sn : sn};
					msg.type = 'append';
					msg.data = array;
					
					// posting a message with transferables will fail on IE10
					try {
						worker.postMessage(msg, [array.buffer]);
					} catch(ex) {
						worker.postMessage(msg); // retry without transferables
					}
					chunkIndex++;
				}, onreaderror);
			} else {
				worker.postMessage({
					sn: sn,
					type: 'flush'
				});
			}
		}

		outputSize = 0;
		worker.addEventListener('message', onmessage, false);
		step();
	}

	function launchProcess(process, reader, writer, offset, size, crcType, onprogress, onend, onreaderror, onwriteerror) {
		var chunkIndex = 0, index, outputSize = 0,
			crcInput = crcType === 'input',
			crcOutput = crcType === 'output',
			crc = new Crc32();
		function step() {
			var outputData;
			index = chunkIndex * CHUNK_SIZE;
			if (index < size)
				reader.readUint8Array(offset + index, Math.min(CHUNK_SIZE, size - index), function(inputData) {
					var outputData;
					try {
						outputData = process.append(inputData, function(loaded) {
							if (onprogress)
								onprogress(index + loaded, size);
						});
					} catch (e) {
						onreaderror(e);
						return;
					}
					if (outputData) {
						outputSize += outputData.length;
						writer.writeUint8Array(outputData, function() {
							chunkIndex++;
							setTimeout(step, 1);
						}, onwriteerror);
						if (crcOutput)
							crc.append(outputData);
					} else {
						chunkIndex++;
						setTimeout(step, 1);
					}
					if (crcInput)
						crc.append(inputData);
					if (onprogress)
						onprogress(index, size);
				}, onreaderror);
			else {
				try {
					outputData = process.flush();
				} catch (e) {
					onreaderror(e);
					return;
				}
				if (outputData) {
					if (crcOutput)
						crc.append(outputData);
					outputSize += outputData.length;
					writer.writeUint8Array(outputData, function() {
						onend(outputSize, crc.get());
					}, onwriteerror);
				} else
					onend(outputSize, crc.get());
			}
		}

		step();
	}

	function inflate(worker, sn, reader, writer, offset, size, computeCrc32, onend, onprogress, onreaderror, onwriteerror) {
		var crcType = computeCrc32 ? 'output' : 'none';
		if (obj.zip.useWebWorkers) {
			var initialMessage = {
				sn: sn,
				codecClass: 'Inflater',
				crcType: crcType,
			};
			launchWorkerProcess(worker, initialMessage, reader, writer, offset, size, onprogress, onend, onreaderror, onwriteerror);
		} else
			launchProcess(new obj.zip.Inflater(), reader, writer, offset, size, crcType, onprogress, onend, onreaderror, onwriteerror);
	}

	function deflate(worker, sn, reader, writer, level, onend, onprogress, onreaderror, onwriteerror) {
		var crcType = 'input';
		if (obj.zip.useWebWorkers) {
			var initialMessage = {
				sn: sn,
				options: {level: level},
				codecClass: 'Deflater',
				crcType: crcType,
			};
			launchWorkerProcess(worker, initialMessage, reader, writer, 0, reader.size, onprogress, onend, onreaderror, onwriteerror);
		} else
			launchProcess(new obj.zip.Deflater(), reader, writer, 0, reader.size, crcType, onprogress, onend, onreaderror, onwriteerror);
	}

	function copy(worker, sn, reader, writer, offset, size, computeCrc32, onend, onprogress, onreaderror, onwriteerror) {
		var crcType = 'input';
		if (obj.zip.useWebWorkers && computeCrc32) {
			var initialMessage = {
				sn: sn,
				codecClass: 'NOOP',
				crcType: crcType,
			};
			launchWorkerProcess(worker, initialMessage, reader, writer, offset, size, onprogress, onend, onreaderror, onwriteerror);
		} else
			launchProcess(new NOOP(), reader, writer, offset, size, crcType, onprogress, onend, onreaderror, onwriteerror);
	}

	// ZipReader

	function decodeASCII(str) {
		var i, out = "", charCode, extendedASCII = [ '\u00C7', '\u00FC', '\u00E9', '\u00E2', '\u00E4', '\u00E0', '\u00E5', '\u00E7', '\u00EA', '\u00EB',
				'\u00E8', '\u00EF', '\u00EE', '\u00EC', '\u00C4', '\u00C5', '\u00C9', '\u00E6', '\u00C6', '\u00F4', '\u00F6', '\u00F2', '\u00FB', '\u00F9',
				'\u00FF', '\u00D6', '\u00DC', '\u00F8', '\u00A3', '\u00D8', '\u00D7', '\u0192', '\u00E1', '\u00ED', '\u00F3', '\u00FA', '\u00F1', '\u00D1',
				'\u00AA', '\u00BA', '\u00BF', '\u00AE', '\u00AC', '\u00BD', '\u00BC', '\u00A1', '\u00AB', '\u00BB', '_', '_', '_', '\u00A6', '\u00A6',
				'\u00C1', '\u00C2', '\u00C0', '\u00A9', '\u00A6', '\u00A6', '+', '+', '\u00A2', '\u00A5', '+', '+', '-', '-', '+', '-', '+', '\u00E3',
				'\u00C3', '+', '+', '-', '-', '\u00A6', '-', '+', '\u00A4', '\u00F0', '\u00D0', '\u00CA', '\u00CB', '\u00C8', 'i', '\u00CD', '\u00CE',
				'\u00CF', '+', '+', '_', '_', '\u00A6', '\u00CC', '_', '\u00D3', '\u00DF', '\u00D4', '\u00D2', '\u00F5', '\u00D5', '\u00B5', '\u00FE',
				'\u00DE', '\u00DA', '\u00DB', '\u00D9', '\u00FD', '\u00DD', '\u00AF', '\u00B4', '\u00AD', '\u00B1', '_', '\u00BE', '\u00B6', '\u00A7',
				'\u00F7', '\u00B8', '\u00B0', '\u00A8', '\u00B7', '\u00B9', '\u00B3', '\u00B2', '_', ' ' ];
		for (i = 0; i < str.length; i++) {
			charCode = str.charCodeAt(i) & 0xFF;
			if (charCode > 127)
				out += extendedASCII[charCode - 128];
			else
				out += String.fromCharCode(charCode);
		}
		return out;
	}

	function decodeUTF8(string) {
		return decodeURIComponent(escape(string));
	}

	function getString(bytes) {
		var i, str = "";
		for (i = 0; i < bytes.length; i++)
			str += String.fromCharCode(bytes[i]);
		return str;
	}

	function getDate(timeRaw) {
		var date = (timeRaw & 0xffff0000) >> 16, time = timeRaw & 0x0000ffff;
		try {
			return new Date(1980 + ((date & 0xFE00) >> 9), ((date & 0x01E0) >> 5) - 1, date & 0x001F, (time & 0xF800) >> 11, (time & 0x07E0) >> 5,
					(time & 0x001F) * 2, 0);
		} catch (e) {
		}
	}

	function readCommonHeader(entry, data, index, centralDirectory, onerror) {
		entry.version = data.view.getUint16(index, true);
		entry.bitFlag = data.view.getUint16(index + 2, true);
		entry.compressionMethod = data.view.getUint16(index + 4, true);
		entry.lastModDateRaw = data.view.getUint32(index + 6, true);
		entry.lastModDate = getDate(entry.lastModDateRaw);
		if ((entry.bitFlag & 0x01) === 0x01) {
			onerror(ERR_ENCRYPTED);
			return;
		}
		if (centralDirectory || (entry.bitFlag & 0x0008) != 0x0008) {
			entry.crc32 = data.view.getUint32(index + 10, true);
			entry.compressedSize = data.view.getUint32(index + 14, true);
			entry.uncompressedSize = data.view.getUint32(index + 18, true);
		}
		if (entry.compressedSize === 0xFFFFFFFF || entry.uncompressedSize === 0xFFFFFFFF) {
			onerror(ERR_ZIP64);
			return;
		}
		entry.filenameLength = data.view.getUint16(index + 22, true);
		entry.extraFieldLength = data.view.getUint16(index + 24, true);
	}

	function createZipReader(reader, callback, onerror) {
		var inflateSN = 0;

		function Entry() {
		}

		Entry.prototype.getData = function(writer, onend, onprogress, checkCrc32) {
			var that = this;

			function testCrc32(crc32) {
				var dataCrc32 = getDataHelper(4);
				dataCrc32.view.setUint32(0, crc32);
				return that.crc32 == dataCrc32.view.getUint32(0);
			}

			function getWriterData(uncompressedSize, crc32) {
				if (checkCrc32 && !testCrc32(crc32))
					onerror(ERR_CRC);
				else
					writer.getData(function(data) {
						onend(data);
					});
			}

			function onreaderror(err) {
				onerror(err || ERR_READ_DATA);
			}

			function onwriteerror(err) {
				onerror(err || ERR_WRITE_DATA);
			}

			reader.readUint8Array(that.offset, 30, function(bytes) {
				var data = getDataHelper(bytes.length, bytes), dataOffset;
				if (data.view.getUint32(0) != 0x504b0304) {
					onerror(ERR_BAD_FORMAT);
					return;
				}
				readCommonHeader(that, data, 4, false, onerror);
				dataOffset = that.offset + 30 + that.filenameLength + that.extraFieldLength;
				writer.init(function() {
					if (that.compressionMethod === 0)
						copy(that._worker, inflateSN++, reader, writer, dataOffset, that.compressedSize, checkCrc32, getWriterData, onprogress, onreaderror, onwriteerror);
					else
						inflate(that._worker, inflateSN++, reader, writer, dataOffset, that.compressedSize, checkCrc32, getWriterData, onprogress, onreaderror, onwriteerror);
				}, onwriteerror);
			}, onreaderror);
		};

		function seekEOCDR(eocdrCallback) {
			// "End of central directory record" is the last part of a zip archive, and is at least 22 bytes long.
			// Zip file comment is the last part of EOCDR and has max length of 64KB,
			// so we only have to search the last 64K + 22 bytes of a archive for EOCDR signature (0x06054b50).
			var EOCDR_MIN = 22;
			if (reader.size < EOCDR_MIN) {
				onerror(ERR_BAD_FORMAT);
				return;
			}
			var ZIP_COMMENT_MAX = 256 * 256, EOCDR_MAX = EOCDR_MIN + ZIP_COMMENT_MAX;

			// In most cases, the EOCDR is EOCDR_MIN bytes long
			doSeek(EOCDR_MIN, function() {
				// If not found, try within EOCDR_MAX bytes
				doSeek(Math.min(EOCDR_MAX, reader.size), function() {
					onerror(ERR_BAD_FORMAT);
				});
			});

			// seek last length bytes of file for EOCDR
			function doSeek(length, eocdrNotFoundCallback) {
				reader.readUint8Array(reader.size - length, length, function(bytes) {
					for (var i = bytes.length - EOCDR_MIN; i >= 0; i--) {
						if (bytes[i] === 0x50 && bytes[i + 1] === 0x4b && bytes[i + 2] === 0x05 && bytes[i + 3] === 0x06) {
							eocdrCallback(new DataView(bytes.buffer, i, EOCDR_MIN));
							return;
						}
					}
					eocdrNotFoundCallback();
				}, function() {
					onerror(ERR_READ);
				});
			}
		}

		var zipReader = {
			getEntries : function(callback) {
				var worker = this._worker;
				// look for End of central directory record
				seekEOCDR(function(dataView) {
					var datalength, fileslength;
					datalength = dataView.getUint32(16, true);
					fileslength = dataView.getUint16(8, true);
					if (datalength < 0 || datalength >= reader.size) {
						onerror(ERR_BAD_FORMAT);
						return;
					}
					reader.readUint8Array(datalength, reader.size - datalength, function(bytes) {
						var i, index = 0, entries = [], entry, filename, comment, data = getDataHelper(bytes.length, bytes);
						for (i = 0; i < fileslength; i++) {
							entry = new Entry();
							entry._worker = worker;
							if (data.view.getUint32(index) != 0x504b0102) {
								onerror(ERR_BAD_FORMAT);
								return;
							}
							readCommonHeader(entry, data, index + 6, true, onerror);
							entry.commentLength = data.view.getUint16(index + 32, true);
							entry.directory = ((data.view.getUint8(index + 38) & 0x10) == 0x10);
							entry.offset = data.view.getUint32(index + 42, true);
							filename = getString(data.array.subarray(index + 46, index + 46 + entry.filenameLength));
							entry.filename = ((entry.bitFlag & 0x0800) === 0x0800) ? decodeUTF8(filename) : decodeASCII(filename);
							if (!entry.directory && entry.filename.charAt(entry.filename.length - 1) == "/")
								entry.directory = true;
							comment = getString(data.array.subarray(index + 46 + entry.filenameLength + entry.extraFieldLength, index + 46
									+ entry.filenameLength + entry.extraFieldLength + entry.commentLength));
							entry.comment = ((entry.bitFlag & 0x0800) === 0x0800) ? decodeUTF8(comment) : decodeASCII(comment);
							entries.push(entry);
							index += 46 + entry.filenameLength + entry.extraFieldLength + entry.commentLength;
						}
						callback(entries);
					}, function() {
						onerror(ERR_READ);
					});
				});
			},
			close : function(callback) {
				if (this._worker) {
					this._worker.terminate();
					this._worker = null;
				}
				if (callback)
					callback();
			},
			_worker: null
		};

		if (!obj.zip.useWebWorkers)
			callback(zipReader);
		else {
			createWorker('inflater',
				function(worker) {
					zipReader._worker = worker;
					callback(zipReader);
				},
				function(err) {
					onerror(err);
				}
			);
		}
	}

	// ZipWriter

	function encodeUTF8(string) {
		return unescape(encodeURIComponent(string));
	}

	function getBytes(str) {
		var i, array = [];
		for (i = 0; i < str.length; i++)
			array.push(str.charCodeAt(i));
		return array;
	}

	function createZipWriter(writer, callback, onerror, dontDeflate) {
		var files = {}, filenames = [], datalength = 0;
		var deflateSN = 0;

		function onwriteerror(err) {
			onerror(err || ERR_WRITE);
		}

		function onreaderror(err) {
			onerror(err || ERR_READ_DATA);
		}

		var zipWriter = {
			add : function(name, reader, onend, onprogress, options) {
				var header, filename, date;
				var worker = this._worker;

				function writeHeader(callback) {
					var data;
					date = options.lastModDate || new Date();
					header = getDataHelper(26);
					files[name] = {
						headerArray : header.array,
						directory : options.directory,
						filename : filename,
						offset : datalength,
						comment : getBytes(encodeUTF8(options.comment || ""))
					};
					header.view.setUint32(0, 0x14000808);
					if (options.version)
						header.view.setUint8(0, options.version);
					if (!dontDeflate && options.level !== 0 && !options.directory)
						header.view.setUint16(4, 0x0800);
					header.view.setUint16(6, (((date.getHours() << 6) | date.getMinutes()) << 5) | date.getSeconds() / 2, true);
					header.view.setUint16(8, ((((date.getFullYear() - 1980) << 4) | (date.getMonth() + 1)) << 5) | date.getDate(), true);
					header.view.setUint16(22, filename.length, true);
					data = getDataHelper(30 + filename.length);
					data.view.setUint32(0, 0x504b0304);
					data.array.set(header.array, 4);
					data.array.set(filename, 30);
					datalength += data.array.length;
					writer.writeUint8Array(data.array, callback, onwriteerror);
				}

				function writeFooter(compressedLength, crc32) {
					var footer = getDataHelper(16);
					datalength += compressedLength || 0;
					footer.view.setUint32(0, 0x504b0708);
					if (typeof crc32 != "undefined") {
						header.view.setUint32(10, crc32, true);
						footer.view.setUint32(4, crc32, true);
					}
					if (reader) {
						footer.view.setUint32(8, compressedLength, true);
						header.view.setUint32(14, compressedLength, true);
						footer.view.setUint32(12, reader.size, true);
						header.view.setUint32(18, reader.size, true);
					}
					writer.writeUint8Array(footer.array, function() {
						datalength += 16;
						onend();
					}, onwriteerror);
				}

				function writeFile() {
					options = options || {};
					name = name.trim();
					if (options.directory && name.charAt(name.length - 1) != "/")
						name += "/";
					if (files.hasOwnProperty(name)) {
						onerror(ERR_DUPLICATED_NAME);
						return;
					}
					filename = getBytes(encodeUTF8(name));
					filenames.push(name);
					writeHeader(function() {
						if (reader)
							if (dontDeflate || options.level === 0)
								copy(worker, deflateSN++, reader, writer, 0, reader.size, true, writeFooter, onprogress, onreaderror, onwriteerror);
							else
								deflate(worker, deflateSN++, reader, writer, options.level, writeFooter, onprogress, onreaderror, onwriteerror);
						else
							writeFooter();
					}, onwriteerror);
				}

				if (reader)
					reader.init(writeFile, onreaderror);
				else
					writeFile();
			},
			close : function(callback) {
				if (this._worker) {
					this._worker.terminate();
					this._worker = null;
				}

				var data, length = 0, index = 0, indexFilename, file;
				for (indexFilename = 0; indexFilename < filenames.length; indexFilename++) {
					file = files[filenames[indexFilename]];
					length += 46 + file.filename.length + file.comment.length;
				}
				data = getDataHelper(length + 22);
				for (indexFilename = 0; indexFilename < filenames.length; indexFilename++) {
					file = files[filenames[indexFilename]];
					data.view.setUint32(index, 0x504b0102);
					data.view.setUint16(index + 4, 0x1400);
					data.array.set(file.headerArray, index + 6);
					data.view.setUint16(index + 32, file.comment.length, true);
					if (file.directory)
						data.view.setUint8(index + 38, 0x10);
					data.view.setUint32(index + 42, file.offset, true);
					data.array.set(file.filename, index + 46);
					data.array.set(file.comment, index + 46 + file.filename.length);
					index += 46 + file.filename.length + file.comment.length;
				}
				data.view.setUint32(index, 0x504b0506);
				data.view.setUint16(index + 8, filenames.length, true);
				data.view.setUint16(index + 10, filenames.length, true);
				data.view.setUint32(index + 12, length, true);
				data.view.setUint32(index + 16, datalength, true);
				writer.writeUint8Array(data.array, function() {
					writer.getData(callback);
				}, onwriteerror);
			},
			_worker: null
		};

		if (!obj.zip.useWebWorkers)
			callback(zipWriter);
		else {
			createWorker('deflater',
				function(worker) {
					zipWriter._worker = worker;
					callback(zipWriter);
				},
				function(err) {
					onerror(err);
				}
			);
		}
	}

	function resolveURLs(urls) {
		var a = document.createElement('a');
		return urls.map(function(url) {
			a.href = url;
			return a.href;
		});
	}

	var DEFAULT_WORKER_SCRIPTS = {
		deflater: ['z-worker.js', 'deflate.js'],
		inflater: ['z-worker.js', 'inflate.js']
	};
	function createWorker(type, callback, onerror) {
		if (obj.zip.workerScripts !== null && obj.zip.workerScriptsPath !== null) {
			onerror(new Error('Either zip.workerScripts or zip.workerScriptsPath may be set, not both.'));
			return;
		}
		var scripts;
		if (obj.zip.workerScripts) {
			scripts = obj.zip.workerScripts[type];
			if (!Array.isArray(scripts)) {
				onerror(new Error('zip.workerScripts.' + type + ' is not an array!'));
				return;
			}
			scripts = resolveURLs(scripts);
		} else {
			scripts = DEFAULT_WORKER_SCRIPTS[type].slice(0);
			scripts[0] = (obj.zip.workerScriptsPath || '') + scripts[0];
		}
		var worker = new Worker(scripts[0]);
		// record total consumed time by inflater/deflater/crc32 in this worker
		worker.codecTime = worker.crcTime = 0;
		worker.postMessage({ type: 'importScripts', scripts: scripts.slice(1) });
		worker.addEventListener('message', onmessage);
		function onmessage(ev) {
			var msg = ev.data;
			if (msg.error) {
				worker.terminate(); // should before onerror(), because onerror() may throw.
				onerror(msg.error);
				return;
			}
			if (msg.type === 'importScripts') {
				worker.removeEventListener('message', onmessage);
				worker.removeEventListener('error', errorHandler);
				callback(worker);
			}
		}
		// catch entry script loading error and other unhandled errors
		worker.addEventListener('error', errorHandler);
		function errorHandler(err) {
			worker.terminate();
			onerror(err);
		}
	}

	function onerror_default(error) {
		console.error(error);
	}
	obj.zip = {
		Reader : Reader,
		Writer : Writer,
		BlobReader : BlobReader,
		Data64URIReader : Data64URIReader,
		TextReader : TextReader,
		BlobWriter : BlobWriter,
		Data64URIWriter : Data64URIWriter,
		TextWriter : TextWriter,
		createReader : function(reader, callback, onerror) {
			onerror = onerror || onerror_default;

			reader.init(function() {
				createZipReader(reader, callback, onerror);
			}, onerror);
		},
		createWriter : function(writer, callback, onerror, dontDeflate) {
			onerror = onerror || onerror_default;
			dontDeflate = !!dontDeflate;

			writer.init(function() {
				createZipWriter(writer, callback, onerror, dontDeflate);
			}, onerror);
		},
		useWebWorkers : true,
		/**
		 * Directory containing the default worker scripts (z-worker.js, deflate.js, and inflate.js), relative to current base url.
		 * E.g.: zip.workerScripts = './';
		 */
		workerScriptsPath : null,
		/**
		 * Advanced option to control which scripts are loaded in the Web worker. If this option is specified, then workerScriptsPath must not be set.
		 * workerScripts.deflater/workerScripts.inflater should be arrays of urls to scripts for deflater/inflater, respectively.
		 * Scripts in the array are executed in order, and the first one should be z-worker.js, which is used to start the worker.
		 * All urls are relative to current base url.
		 * E.g.:
		 * zip.workerScripts = {
		 *   deflater: ['z-worker.js', 'deflate.js'],
		 *   inflater: ['z-worker.js', 'inflate.js']
		 * };
		 */
		workerScripts : null,
	};

})(this);