Full Code of sunnyyoung/WeChatTweak-CLI for AI

Repository: sunnyyoung/WeChatTweak-CLI
Branch: master
Commit: a90b370b6c27
Files: 11
Total size: 38.3 KB

Directory structure:
gitextract_827__s9_/

├── .gitignore
├── CNAME
├── LICENSE
├── Makefile
├── Package.resolved
├── Package.swift
├── README.md
└── Sources/
    ├── WeChatTweak-CLI/
    │   ├── Command.swift
    │   └── main.swift
    └── insert_dylib/
        ├── insert_dylib.h
        └── module.modulemap

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

================================================
FILE: .gitignore
================================================
### macOS ###
# General
.DS_Store
.AppleDouble
.LSOverride

# Icon must end with two \r
Icon


# Thumbnails
._*

# Files that might appear in the root of a volume
.DocumentRevisions-V100
.fseventsd
.Spotlight-V100
.TemporaryItems
.Trashes
.VolumeIcon.icns
.com.apple.timemachine.donotpresent

# Directories potentially created on remote AFP share
.AppleDB
.AppleDesktop
Network Trash Folder
Temporary Items
.apdisk

### Windows ###
# Windows thumbnail cache files
Thumbs.db
Thumbs.db:encryptable
ehthumbs.db
ehthumbs_vista.db

# Dump file
*.stackdump

# Folder config file
[Dd]esktop.ini

# Recycle Bin used on file shares
$RECYCLE.BIN/

# Windows Installer files
*.cab
*.msi
*.msix
*.msm
*.msp

# Windows shortcuts
*.lnk

### Xcode ###
# Xcode
#
# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore

## User settings
xcuserdata/

## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
*.xcscmblueprint
*.xccheckout

## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
build/
DerivedData/
*.moved-aside
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3

## Gcc Patch
/*.gcno

### Xcode Patch ###
*.xcodeproj/*
!*.xcodeproj/project.pbxproj
!*.xcodeproj/xcshareddata/
!*.xcworkspace/contents.xcworkspacedata
**/xcshareddata/WorkspaceSettings.xcsettings

### SwiftPackageManager ###
Packages
.build/
.swiftpm/
xcuserdata
DerivedData/
*.xcodeproj

### Release ###

/wechattweak-cli


================================================
FILE: CNAME
================================================
cli.tweaks.app

================================================
FILE: LICENSE
================================================
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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================================================
FILE: Makefile
================================================
.DEFAULT := build

build:
	swift package purge-cache
	swift package clean
	swift build -c release --arch arm64 --arch x86_64
	cp .build/apple/Products/Release/wechattweak-cli .

clean:
	swift package purge-cache
	swift package clean
	rm -rf .build wechattweak-cli


================================================
FILE: Package.resolved
================================================
{
  "object": {
    "pins": [
      {
        "package": "Alamofire",
        "repositoryURL": "https://github.com/Alamofire/Alamofire",
        "state": {
          "branch": null,
          "revision": "bc268c28fb170f494de9e9927c371b8342979ece",
          "version": "5.7.1"
        }
      },
      {
        "package": "PromiseKit",
        "repositoryURL": "https://github.com/mxcl/PromiseKit",
        "state": {
          "branch": null,
          "revision": "8a98e31a47854d3180882c8068cc4d9381bf382d",
          "version": "6.22.1"
        }
      },
      {
        "package": "swift-argument-parser",
        "repositoryURL": "https://github.com/apple/swift-argument-parser",
        "state": {
          "branch": null,
          "revision": "fee6933f37fde9a5e12a1e4aeaa93fe60116ff2a",
          "version": "1.2.2"
        }
      }
    ]
  },
  "version": 1
}


================================================
FILE: Package.swift
================================================
// swift-tools-version:5.5

import PackageDescription

let package = Package(
    name: "WeChatTweak-CLI",
    platforms: [
        .macOS(.v10_12)
    ],
    products: [
        .executable(
            name: "wechattweak-cli",
            targets: [
                "WeChatTweak-CLI"
            ]
        )
    ],
    dependencies: [
        .package(url: "https://github.com/Alamofire/Alamofire", from: "5.7.1"),
        .package(url: "https://github.com/mxcl/PromiseKit", from: "6.22.1"),
        .package(url: "https://github.com/apple/swift-argument-parser", from: "1.2.2")
    ],
    targets: [
        .executableTarget(
            name: "WeChatTweak-CLI",
            dependencies: [
                "Alamofire",
                "PromiseKit",
                "insert_dylib",
                .product(name: "ArgumentParser", package: "swift-argument-parser")
            ]
        ),
        .systemLibrary(
            name: "insert_dylib",
            path: "Sources/insert_dylib"
        )
    ]
)


================================================
FILE: README.md
================================================
# WeChatTweak-CLI

## ⚠️ NOTICE ⚠️

WeChatTweak-CLI is no longer maintained. To reduce maintenance cost and avoid confusion, the CLI features have been consolidated into [**WeChatTweak**](https://github.com/sunnyyoung/WeChatTweak), which will keep adapting to future WeChat client releases.

## License

The [Apache License 2.0](LICENSE).


================================================
FILE: Sources/WeChatTweak-CLI/Command.swift
================================================
//
//  Command.swift
//
//  Created by Sunny Young.
//

import Foundation
import Alamofire
import PromiseKit
import ArgumentParser
import insert_dylib

struct Command {
    static func check() -> Promise<Void> {
        return getuid() == 0 ? .value(()) : .init(error: CLIError.permission)
    }

    static func cleanup() -> Guarantee<Void> {
        return Guarantee { seal in
            try? FileManager.default.removeItem(atPath: Temp.zip)
            try? FileManager.default.removeItem(atPath: Temp.binary)
            seal(())
        }
    }

    static func backup() -> Promise<Void> {
        print("------ Backup ------")
        return Promise { seal in
            do {
                if FileManager.default.fileExists(atPath: App.backup) {
                    print("WeChat.bak exists, skip it...")
                } else {
                    try FileManager.default.copyItem(atPath: App.binary, toPath: App.backup)
                    print("Created WeChat.bak...")
                }
                seal.fulfill(())
            } catch {
                seal.reject(error)
            }
        }
    }

    static func restore() -> Promise<Void> {
        print("------ Restore ------")
        return Promise { seal in
            do {
                if FileManager.default.fileExists(atPath: App.backup) {
                    try FileManager.default.removeItem(atPath: App.binary)
                    try FileManager.default.moveItem(atPath: App.backup, toPath: App.binary)
                    try? FileManager.default.removeItem(atPath: App.framework)
                    print("Restored WeChat...")
                } else {
                    print("WeChat.bak not exists, skip it...")
                }
                seal.fulfill(())
            } catch {
                seal.reject(error)
            }
        }
    }

    static func download() -> Promise<Void> {
        print("------ Download ------")
        return Promise { seal in
            let destination: DownloadRequest.Destination = { _, _ in
                return (.init(fileURLWithPath: Temp.zip), [.removePreviousFile])
            }
            AF.download(Constant.url, to: destination).response { response in
                if let error = response.error {
                    seal.reject(CLIError.downloading(error))
                } else {
                    seal.fulfill(())
                }
            }
        }
    }

    static func unzip() -> Promise<Void> {
        print("------ Unzip ------")
        return Command.execute(command: "rm -rf \(App.framework); unzip \(Temp.zip) -d \(App.macos)")
    }

    static func insert() -> Promise<Void> {
        print("------ Insert Dylib ------")
        return Promise { seal in
            insert_dylib.insert("@executable_path/WeChatTweak.framework/WeChatTweak", App.binary) == EXIT_SUCCESS ? seal.fulfill(()) : seal.reject(CLIError.insertDylib)
        }
    }

    static func removeCodesign() -> Promise<Void> {
        print("------ Remove Codesign ------")
        return Command.execute(command: "codesign --remove-sign \(App.binary)")
    }

    static func addCodesign() -> Promise<Void> {
        print("------ Add Codesign ------")
        return Command.execute(command: "codesign --force --deep --sign - \(App.binary)")
    }

    static func resetPermission() -> Promise<Void> {
        print("------ Reset ScreenCapture privacy permission ------")
        return Command.execute(command: "tccutil reset ScreenCapture com.tencent.xinWeChat")
    }

    private static func execute(command: String) -> Promise<Void> {
        return Promise { seal in
            print("Execute command: \(command)")
            var error: NSDictionary?
            guard let script = NSAppleScript(source: "do shell script \"\(command)\"") else {
                return seal.reject(CLIError.executing(command: command, error: ["error": "Create script failed."]))
            }
            script.executeAndReturnError(&error)
            if let error = error {
                seal.reject(CLIError.executing(command: command, error: error))
            } else {
                seal.fulfill(())
            }
        }
    }
}


================================================
FILE: Sources/WeChatTweak-CLI/main.swift
================================================
//
//  main.swift
//
//  Created by Sunny Young.
//

import Foundation
import PromiseKit
import ArgumentParser

struct Constant {
    static let url = URL(string: "https://github.com/Sunnyyoung/WeChatTweak-macOS/releases/latest/download/WeChatTweak.framework.zip")!
}

struct App {
    static let root = "/Applications"
    static let app = root.appending("/WeChat.app")
    static let macos = app.appending("/Contents/MacOS")
    static let binary = app.appending("/Contents/MacOS/WeChat")
    static let backup = app.appending("/Contents/MacOS/WeChat.bak")

    static let framework = macos.appending("/WeChatTweak.framework")
}

struct Temp {
    static let root = "/tmp"
    static let binary = root.appending("/WeChat")
    static let zip = root.appending("/WeChatTweak.zip")
}

enum CLIError: LocalizedError {
    case permission
    case downloading(Error)
    case insertDylib
    case executing(command: String, error: NSDictionary)

    var errorDescription: String? {
        switch self {
        case .permission:
            return "Please run with `sudo`."
        case let .downloading(error):
            return "Download failed with error: \(error)"
        case .insertDylib:
            return "Insert dylib failed"
        case let .executing(command, error):
            return "Execute command: \(command) failed: \(error)"
        }
    }
}

struct Install: ParsableCommand {
    static var configuration = CommandConfiguration(abstract: "Install or upgrade tweak.")

    func run() throws {
        firstly {
            Command.check()
        }.then {
            Command.cleanup()
        }.then {
            Command.download()
        }.then {
            Command.unzip()
        }.then {
            Command.backup()
        }.then {
            Command.removeCodesign()
        }.then {
            Command.insert()
        }.then {
            Command.addCodesign()
        }.then {
            Command.resetPermission()
        }.done {
            print("Install success!")
        }.catch { error in
            print("Install failed: \(error.localizedDescription)")
        }.finally {
            CFRunLoopStop(CFRunLoopGetCurrent())
        }
    }
}

struct Uninstall: ParsableCommand {
    static var configuration = CommandConfiguration(abstract: "Uninstall tweak.")

    func run() throws {
        firstly {
            Command.check()
        }.then {
            Command.cleanup()
        }.then {
            Command.restore()
        }.done {
            print("Uninstall success!")
        }.catch { error in
            print("Uninstall failed: \(error)")
        }.finally {
            CFRunLoopStop(CFRunLoopGetCurrent())
        }
    }
}

struct Version: ParsableCommand {
    static var configuration = CommandConfiguration(abstract: "Get current version of WeChatTweak.")

    func run() throws {
        return firstly {
            getVersion()
        }.done { version in
            print(version ?? "Unknown")
        }.catch { error in
            print("Get version failed: \(error)")
        }.finally {
            CFRunLoopStop(CFRunLoopGetCurrent())
        }
    }

    func getVersion() -> Promise<String?> {
        return Promise { seal in
            do {
                let data = try Data(contentsOf: URL(fileURLWithPath: App.framework.appending("/Versions/A/Resources/Info.plist")))
                let info = try PropertyListSerialization.propertyList(from: data, options: [], format: nil)
                seal.fulfill((info as? [String: Any])?["CFBundleShortVersionString"] as? String)
            } catch {
                seal.reject(error)
            }
        }
    }
}

struct Resign: ParsableCommand {
    static var configuration = CommandConfiguration(abstract: "Force resign WeChat.app")

    func run() throws {
        firstly {
            Command.removeCodesign()
        }.then {
            Command.addCodesign()
        }.catch { error in
            print("Resign failed: \(error.localizedDescription)")
        }.finally {
            CFRunLoopStop(CFRunLoopGetCurrent())
        }
    }
}

struct Tweak: ParsableCommand {
    static var configuration = CommandConfiguration(
        commandName: "wechattweak-cli",
        abstract: "A command line utility to work with WeChatTweak-macOS.",
        subcommands: [
            Install.self,
            Uninstall.self,
            Resign.self,
            Version.self
        ],
        defaultSubcommand: Self.self
    )
}

defer {
    try? FileManager.default.removeItem(atPath: Temp.zip)
    try? FileManager.default.removeItem(atPath: Temp.binary)
}

Tweak.main()
CFRunLoopRun()


================================================
FILE: Sources/insert_dylib/insert_dylib.h
================================================
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <copyfile.h>
#include <mach-o/loader.h>
#include <mach-o/fat.h>

#define IS_64_BIT(x) ((x) == MH_MAGIC_64 || (x) == MH_CIGAM_64)
#define IS_LITTLE_ENDIAN(x) ((x) == FAT_CIGAM || (x) == MH_CIGAM_64 || (x) == MH_CIGAM)
#define SWAP32(x, magic) (IS_LITTLE_ENDIAN(magic)? OSSwapInt32(x): (x))
#define SWAP64(x, magic) (IS_LITTLE_ENDIAN(magic)? OSSwapInt64(x): (x))

#define ROUND_UP(x, y) (((x) + (y) - 1) & -(y))

#define ABSDIFF(x, y) ((x) > (y)? (uintmax_t)(x) - (uintmax_t)(y): (uintmax_t)(y) - (uintmax_t)(x))

#define BUFSIZE 512

void fbzero(FILE *f, off_t offset, size_t len) {
    static unsigned char zeros[BUFSIZE] = {0};
    fseeko(f, offset, SEEK_SET);
    while(len != 0) {
        size_t size = MIN(len, sizeof(zeros));
        fwrite(zeros, size, 1, f);
        len -= size;
    }
}

void fmemmove(FILE *f, off_t dst, off_t src, size_t len) {
    static unsigned char buf[BUFSIZE];
    while(len != 0) {
        size_t size = MIN(len, sizeof(buf));
        fseeko(f, src, SEEK_SET);
        fread(&buf, size, 1, f);
        fseeko(f, dst, SEEK_SET);
        fwrite(buf, size, 1, f);

        len -= size;
        src += size;
        dst += size;
    }
}

int weak_flag = false;

size_t fpeek(void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream) {
    off_t pos = ftello(stream);
    size_t result = fread(ptr, size, nitems, stream);
    fseeko(stream, pos, SEEK_SET);
    return result;
}

void *read_load_command(FILE *f, uint32_t cmdsize) {
    void *lc = malloc(cmdsize);

    fpeek(lc, cmdsize, 1, f);

    return lc;
}

bool check_load_commands(FILE *f, struct mach_header *mh, size_t header_offset, size_t commands_offset, const char *dylib_path, off_t *slice_size) {
    fseeko(f, commands_offset, SEEK_SET);

    uint32_t ncmds = SWAP32(mh->ncmds, mh->magic);

    off_t linkedit_32_pos = -1;
    off_t linkedit_64_pos = -1;
    struct segment_command linkedit_32;
    struct segment_command_64 linkedit_64;

    off_t symtab_pos = -1;
    uint32_t symtab_size = 0;

    for(int i = 0; i < ncmds; i++) {
        struct load_command lc;
        fpeek(&lc, sizeof(lc), 1, f);

        uint32_t cmdsize = SWAP32(lc.cmdsize, mh->magic);
        uint32_t cmd = SWAP32(lc.cmd, mh->magic);

        switch(cmd) {
            case LC_CODE_SIGNATURE:
                if(i == ncmds - 1) {
                    printf("LC_CODE_SIGNATURE load command found. Remove it.\n");

                    struct linkedit_data_command *cmd = read_load_command(f, cmdsize);

                    fbzero(f, ftello(f), cmdsize);

                    uint32_t dataoff = SWAP32(cmd->dataoff, mh->magic);
                    uint32_t datasize = SWAP32(cmd->datasize, mh->magic);

                    free(cmd);

                    uint64_t linkedit_fileoff = 0;
                    uint64_t linkedit_filesize = 0;

                    if(linkedit_32_pos != -1) {
                        linkedit_fileoff = SWAP32(linkedit_32.fileoff, mh->magic);
                        linkedit_filesize = SWAP32(linkedit_32.filesize, mh->magic);
                    } else if(linkedit_64_pos != -1) {
                        linkedit_fileoff = SWAP64(linkedit_64.fileoff, mh->magic);
                        linkedit_filesize = SWAP64(linkedit_64.filesize, mh->magic);
                    } else {
                        fprintf(stderr, "Warning: __LINKEDIT segment not found.\n");
                    }

                    if(linkedit_32_pos != -1 || linkedit_64_pos != -1) {
                        if(linkedit_fileoff + linkedit_filesize != *slice_size) {
                            fprintf(stderr, "Warning: __LINKEDIT segment is not at the end of the file, so codesign will not work on the patched binary.\n");
                        } else {
                            if(dataoff + datasize != *slice_size) {
                                fprintf(stderr, "Warning: Codesignature is not at the end of __LINKEDIT segment, so codesign will not work on the patched binary.\n");
                            } else {
                                *slice_size -= datasize;
                                //int64_t diff_size = 0;
                                if(symtab_pos == -1) {
                                    fprintf(stderr, "Warning: LC_SYMTAB load command not found. codesign might not work on the patched binary.\n");
                                } else {
                                    fseeko(f, symtab_pos, SEEK_SET);
                                    struct symtab_command *symtab = read_load_command(f, symtab_size);

                                    uint32_t strsize = SWAP32(symtab->strsize, mh->magic);
                                    int64_t diff_size = SWAP32(symtab->stroff, mh->magic) + strsize - (int64_t)*slice_size;
                                    if(-0x10 <= diff_size && diff_size <= 0) {
                                        symtab->strsize = SWAP32((uint32_t)(strsize - diff_size), mh->magic);
                                        fwrite(symtab, symtab_size, 1, f);
                                    } else {
                                        fprintf(stderr, "Warning: String table doesn't appear right before code signature. codesign might not work on the patched binary. (0x%llx)\n", diff_size);
                                    }

                                    free(symtab);
                                }

                                linkedit_filesize -= datasize;
                                uint64_t linkedit_vmsize = ROUND_UP(linkedit_filesize, 0x1000);

                                if(linkedit_32_pos != -1) {
                                    linkedit_32.filesize = SWAP32((uint32_t)linkedit_filesize, mh->magic);
                                    linkedit_32.vmsize = SWAP32((uint32_t)linkedit_vmsize, mh->magic);

                                    fseeko(f, linkedit_32_pos, SEEK_SET);
                                    fwrite(&linkedit_32, sizeof(linkedit_32), 1, f);
                                } else {
                                    linkedit_64.filesize = SWAP64(linkedit_filesize, mh->magic);
                                    linkedit_64.vmsize = SWAP64(linkedit_vmsize, mh->magic);

                                    fseeko(f, linkedit_64_pos, SEEK_SET);
                                    fwrite(&linkedit_64, sizeof(linkedit_64), 1, f);
                                }

                                goto fix_header;
                            }
                        }
                    }

                    // If we haven't truncated the file, zero out the code signature
                    fbzero(f, header_offset + dataoff, datasize);

                fix_header:
                    mh->ncmds = SWAP32(ncmds - 1, mh->magic);
                    mh->sizeofcmds = SWAP32(SWAP32(mh->sizeofcmds, mh->magic) - cmdsize, mh->magic);

                    return true;
                } else {
                    printf("LC_CODE_SIGNATURE is not the last load command, so couldn't remove.\n");
                }
                break;
            case LC_LOAD_DYLIB:
            case LC_LOAD_WEAK_DYLIB: {
                struct dylib_command *dylib_command = read_load_command(f, cmdsize);

                union lc_str offset = dylib_command->dylib.name;
                char *name = &((char *)dylib_command)[SWAP32(offset.offset, mh->magic)];

                int cmp = strcmp(name, dylib_path);

                free(dylib_command);

                if(cmp == 0) {
                    printf("Binary already contains a load command for that dylib. Skip it.\n");
                    return false;
                }

                break;
            }
            case LC_SEGMENT:
            case LC_SEGMENT_64:
                if(cmd == LC_SEGMENT) {
                    struct segment_command *cmd = read_load_command(f, cmdsize);
                    if(strcmp(cmd->segname, "__LINKEDIT") == 0) {
                        linkedit_32_pos = ftello(f);
                        linkedit_32 = *cmd;
                    }
                    free(cmd);
                } else {
                    struct segment_command_64 *cmd = read_load_command(f, cmdsize);
                    if(strcmp(cmd->segname, "__LINKEDIT") == 0) {
                        linkedit_64_pos = ftello(f);
                        linkedit_64 = *cmd;
                    }
                    free(cmd);
                }
            case LC_SYMTAB:
                symtab_pos = ftello(f);
                symtab_size = cmdsize;
        }

        fseeko(f, SWAP32(lc.cmdsize, mh->magic), SEEK_CUR);
    }

    return true;
}

bool _insert_dylib(FILE *f, size_t header_offset, const char *dylib_path, off_t *slice_size) {
    fseeko(f, header_offset, SEEK_SET);

    struct mach_header mh;
    fread(&mh, sizeof(struct mach_header), 1, f);

    if(mh.magic != MH_MAGIC_64 && mh.magic != MH_CIGAM_64 && mh.magic != MH_MAGIC && mh.magic != MH_CIGAM) {
        printf("Unknown magic: 0x%x\n", mh.magic);
        return false;
    }

    size_t commands_offset = header_offset + (IS_64_BIT(mh.magic)? sizeof(struct mach_header_64): sizeof(struct mach_header));

    bool cont = check_load_commands(f, &mh, header_offset, commands_offset, dylib_path, slice_size);

    if(!cont) {
        return true;
    }

    // Even though a padding of 4 works for x86_64, codesign doesn't like it
    size_t path_padding = 8;

    size_t dylib_path_len = strlen(dylib_path);
    size_t dylib_path_size = (dylib_path_len & ~(path_padding - 1)) + path_padding;
    uint32_t cmdsize = (uint32_t)(sizeof(struct dylib_command) + dylib_path_size);

    struct dylib_command dylib_command = {
        .cmd = SWAP32(weak_flag? LC_LOAD_WEAK_DYLIB: LC_LOAD_DYLIB, mh.magic),
        .cmdsize = SWAP32(cmdsize, mh.magic),
        .dylib = {
            .name = SWAP32(sizeof(struct dylib_command), mh.magic),
            .timestamp = 0,
            .current_version = 0,
            .compatibility_version = 0
        }
    };

    uint32_t sizeofcmds = SWAP32(mh.sizeofcmds, mh.magic);

    fseeko(f, commands_offset + sizeofcmds, SEEK_SET);
    char space[cmdsize];

    fread(&space, cmdsize, 1, f);

    bool empty = true;
    for(int i = 0; i < cmdsize; i++) {
        if(space[i] != 0) {
            empty = false;
            break;
        }
    }

    if(!empty) {
        printf("It doesn't seem like there is enough empty space. Continue anyway.");
    }

    fseeko(f, -((off_t)cmdsize), SEEK_CUR);

    char *dylib_path_padded = calloc(dylib_path_size, 1);
    memcpy(dylib_path_padded, dylib_path, dylib_path_len);

    fwrite(&dylib_command, sizeof(dylib_command), 1, f);
    fwrite(dylib_path_padded, dylib_path_size, 1, f);

    free(dylib_path_padded);

    mh.ncmds = SWAP32(SWAP32(mh.ncmds, mh.magic) + 1, mh.magic);
    sizeofcmds += cmdsize;
    mh.sizeofcmds = SWAP32(sizeofcmds, mh.magic);

    fseeko(f, header_offset, SEEK_SET);
    fwrite(&mh, sizeof(mh), 1, f);

    return true;
}

int insert(const char *lib_path, const char *bin_path) {
    const char *lc_name = weak_flag? "LC_LOAD_WEAK_DYLIB": "LC_LOAD_DYLIB";

    struct stat s;

    if(stat(bin_path, &s) != 0) {
        perror(bin_path);
        return EXIT_FAILURE;
    }

    if(lib_path[0] != '@' && stat(lib_path, &s) != 0) {
        return EXIT_FAILURE;
    }

    FILE *f = fopen(bin_path, "r+");

    if(!f) {
        printf("Couldn't open file %s\n", bin_path);
        return EXIT_FAILURE;
    }

    bool success = true;

    fseeko(f, 0, SEEK_END);
    off_t file_size = ftello(f);
    rewind(f);

    uint32_t magic;
    fread(&magic, sizeof(uint32_t), 1, f);

    switch(magic) {
        case FAT_MAGIC:
        case FAT_CIGAM: {
            fseeko(f, 0, SEEK_SET);

            struct fat_header fh;
            fread(&fh, sizeof(fh), 1, f);

            uint32_t nfat_arch = SWAP32(fh.nfat_arch, magic);

            printf("Binary is a fat binary with %d archs.\n", nfat_arch);

            struct fat_arch archs[nfat_arch];
            fread(archs, sizeof(archs), 1, f);

            int fails = 0;

            uint32_t offset = 0;
            if(nfat_arch > 0) {
                offset = SWAP32(archs[0].offset, magic);
            }

            for(int i = 0; i < nfat_arch; i++) {
                off_t orig_offset = SWAP32(archs[i].offset, magic);
                off_t orig_slice_size = SWAP32(archs[i].size, magic);
                offset = ROUND_UP(offset, 1 << SWAP32(archs[i].align, magic));
                if(orig_offset != offset) {
                    fmemmove(f, offset, orig_offset, orig_slice_size);
                    fbzero(f, MIN(offset, orig_offset) + orig_slice_size, ABSDIFF(offset, orig_offset));

                    archs[i].offset = SWAP32(offset, magic);
                }

                off_t slice_size = orig_slice_size;
                bool r = _insert_dylib(f, offset, lib_path, &slice_size);
                if(!r) {
                    printf("Failed to add %s to arch #%d!\n", lc_name, i + 1);
                    fails++;
                }

                if(slice_size < orig_slice_size && i < nfat_arch - 1) {
                    fbzero(f, offset + slice_size, orig_slice_size - slice_size);
                }

                file_size = offset + slice_size;
                offset += slice_size;
                archs[i].size = SWAP32((uint32_t)slice_size, magic);
            }

            rewind(f);
            fwrite(&fh, sizeof(fh), 1, f);
            fwrite(archs, sizeof(archs), 1, f);

            // We need to flush before truncating
            fflush(f);
            ftruncate(fileno(f), file_size);

            if(fails == 0) {
                printf("Added %s to all archs in %s\n", lc_name, bin_path);
            } else if(fails == nfat_arch) {
                printf("Failed to add %s to any archs.\n", lc_name);
                success = false;
            } else {
                printf("Added %s to %d/%d archs in %s\n", lc_name, nfat_arch - fails, nfat_arch, bin_path);
            }

            break;
        }
        case MH_MAGIC_64:
        case MH_CIGAM_64:
        case MH_MAGIC:
        case MH_CIGAM:
            if(_insert_dylib(f, 0, lib_path, &file_size)) {
                ftruncate(fileno(f), file_size);
                printf("Added %s to %s\n", lc_name, bin_path);
            } else {
                printf("Failed to add %s!\n", lc_name);
                success = false;
            }
            break;
        default:
            printf("Unknown magic: 0x%x\n", magic);
            return EXIT_FAILURE;
    }

    fclose(f);

    if(!success) {
        unlink(bin_path);
        return EXIT_FAILURE;
    } else {
        return EXIT_SUCCESS;
    }
}


================================================
FILE: Sources/insert_dylib/module.modulemap
================================================
module insert_dylib {
  header "insert_dylib.h"
  export *
}