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Add pak subdir

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pak/CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 2.8)
project(chrome-pak C)
option(LGPL "Use custom startfiles on windows for smaller binary, requiring GNU Lesser General Public License 2.1+." ON)
if (NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build, options are: Debug Release." FORCE)
endif (NOT CMAKE_BUILD_TYPE)
if (MSVC)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MT /wd4996 /wd4068")
set(CompilerFlags
CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE)
foreach (CompilerFlag ${CompilerFlags})
string(REPLACE "/MD" "/MT" ${CompilerFlag} "${${CompilerFlag}}")
endforeach ()
endif ()
if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
set(CMAKE_C_FLAGS "-O3 -Os -pipe -Wall -Wextra -fmerge-all-constants -Wl,--gc-sections,--build-id=none")
set(CMAKE_C_FLAGS_DEBUG "-g")
set(CMAKE_C_FLAGS_RELEASE "-s")
if (WIN32 AND LGPL)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -nostartfiles -D_LGPL")
endif ()
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_C_FLAGS}")
endif ()
aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR} DIR_SRCS)
add_executable(pak ${DIR_SRCS})

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MIT License
Copyright (c) 2018 myfreeer
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.

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GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
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Everyone is permitted to copy and distribute verbatim copies
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[This is the first released version of the Lesser GPL. It also counts
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That's all there is to it!

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# chrome-pak-customizer
a simple batch tool to customize pak files in chrome or chromium-based browser
## Badges
[![Build status](https://ci.appveyor.com/api/projects/status/4ji3guqh4yyjfiaa?svg=true)](https://ci.appveyor.com/project/myfreeer/chrome-pak-customizer)
[![Download](https://img.shields.io/github/downloads/myfreeer/chrome-pak-customizer/total.svg)](https://github.com/myfreeer/chrome-pak-customizer/releases)
[![Latest Release](https://img.shields.io/github/release/myfreeer/chrome-pak-customizer.svg)](https://github.com/myfreeer/chrome-pak-customizer/releases/latest)
## License
* Windows builds are licensed `LGPL 2.1+` **by default**, can be disabled by appending `-DLGPL=OFF` to cmake.
* Non-windows builds and builds with `-DLGPL=OFF` are licensed MIT.
## Usage (Windows Only)
1. Download `chrome-pak.7z` from [releases](https://github.com/myfreeer/chrome-pak-customizer/releases) and extract it to any folder.
2. Drag the pak file and drop it to `unpack.bat`.
3. The pak file would be extracted to subfolder of the folder of the pak file,
with the same name of the pak file with an `_unpacked` suffix.
4. (Optional) modify extracted files.
5. Drag `pak_index.ini` to `pack.bat`.
6. Repacked pak file would be in the same folder of `pak_index.ini` with a name like `pak_index_packed.pak`.
There is also a [GIF Guide](https://github.com/myfreeer/chrome-pak-customizer/wiki/GIF-Guide-v2) on windows.
## Usage (Command line)
```
pak.exe -u pak_file destination_path
Unpack chrome pak file at pak_file to destination_path.
pak.exe -p pak_index_file destination_pak_file
Pack chrome pak file using pak_index_file to destination_pak_file.
pak_index_file would be found in unpacked path.
Note: existing destination files would be overwritten
```
## Building
### Prerequires
* gcc
* cmake
* ninja
### Build script example
```bash
# Getting source
git clone https://github.com/myfreeer/chrome-pak-customizer --branch=develop --single-branch
cd chrome-pak-customizer
# Creating folder for build
mkdir -p build
cd build
# Running cmake
cmake -GNinja -DLGPL=OFF ..
# Building
ninja
```
### CMake options
* `LGPL`: Enable LGPL 2.1+ licensed custom startfiles on windows for smaller binary
## Credits
* <https://www.chromium.org/>
* <https://github.com/shuax/ChromePAK>
* <https://github.com/myfreeer/win-startup-headers>

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echo Syncing msys2 packages...
C:\msys64\usr\bin\pacman -Sq --noconfirm --needed --noprogressbar --ask=20 mingw-w64-x86_64-ninja mingw-w64-i686-ninja
rem C:\msys64\usr\bin\pacman -Scq --noconfirm
echo Fetching test files
if not exist tests mkdir tests
cd tests
for %%i in (test_v4_474896_1.pak test_v4_474896_2.pak test_v4_474896_r.pak test_v5_550886_1.pak test_v5_550886_2.pak test_v5_550886_r.pak) do if not exist "%%~i" appveyor.exe DownloadFile "https://github.com/myfreeer/chrome-pak-customizer/releases/download/1.0/%%~i"
cd ..
echo Building and testing 64-bit version...
set MSYSTEM=MINGW64
call C:\msys64\usr\bin\bash -lc "cd \"$APPVEYOR_BUILD_FOLDER\" && exec ./test.sh"
move /Y .\build_x86_64-w64-mingw32\pak.exe .\pak_mingw64.exe
echo Building and testing 32-bit version...
set MSYSTEM=MINGW32
call C:\msys64\usr\bin\bash -lc "cd \"$APPVEYOR_BUILD_FOLDER\" && exec ./test.sh"
move /Y .\build_i686-w64-mingw32\pak.exe .\pak_mingw32.exe
echo Building with msvc 32-bit...
mkdir msvc_32
cd msvc_32
cmake ..
cmake --build . --target ALL_BUILD --config Release
move /Y .\Release\pak.exe ..\pak_msvc32.exe
cd ..
echo Building with msvc 64-bit...
mkdir msvc_64
cd msvc_64
cmake -G "Visual Studio 14 2015 Win64" ..
cmake --build . --target ALL_BUILD --config Release
move /Y .\Release\pak.exe ..\pak_msvc64.exe
cd ..
echo Packaging...
7z a -mx9 chrome-pak.7z .\pak_mingw64.exe .\pak_mingw32.exe .\pack.bat .\unpack.bat
7z a -mx9 chrome-pak_msvc.7z .\pak_msvc32.exe .\pak_msvc64.exe .\pack.bat .\unpack.bat
echo Done.

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version: 2.0-{build}
skip_tags: true
build_script:
- cmd: >-
appveyor.bat
on_failure:
- 7z a -mx9 -r fail.7z *.exe *.sln *.txt *.log
- appveyor.exe PushArtifact fail.7z
shallow_clone: true
test: off
artifacts:
- path: pak_mingw64.exe
- path: pak_mingw32.exe
- path: pak_msvc64.exe
- path: pak_msvc32.exe
- path: chrome-pak.7z
- path: chrome-pak_msvc.7z
cache:
- tests
skip_commits:
files:
- 'LICENSE'
- '*.md'
- '.gitingore'
- '.gitattributes'

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#pragma once
#ifndef COMMANDLINETOARGVA_H
#define COMMANDLINETOARGVA_H
#include <string.h>
#include <windows.h>
// https://github.com/wine-mirror/wine/blob/5946973021285dd6ecb8df224956fea4817f8fed/dlls/shell32/shell32_main.c
// https://github.com/futurist/CommandLineToArgvA/blob/09765ffef215f0a066d6b0ea5c1edda88b6739af/CommandLineToArgvA.c
/*************************************************************************
* CommandLineToArgvA [SHELL32.@]
*
* We must interpret the quotes in the command line to rebuild the argv
* array correctly:
* - arguments are separated by spaces or tabs
* - quotes serve as optional argument delimiters
* '"a b"' -> 'a b'
* - escaped quotes must be converted back to '"'
* '\"' -> '"'
* - consecutive backslashes preceding a quote see their number halved with
* the remainder escaping the quote:
* 2n backslashes + quote -> n backslashes + quote as an argument delimiter
* 2n+1 backslashes + quote -> n backslashes + literal quote
* - backslashes that are not followed by a quote are copied literally:
* 'a\b' -> 'a\b'
* 'a\\b' -> 'a\\b'
* - in quoted strings, consecutive quotes see their number divided by three
* with the remainder modulo 3 deciding whether to close the string or not.
* Note that the opening quote must be counted in the consecutive quotes,
* that's the (1+) below:
* (1+) 3n quotes -> n quotes
* (1+) 3n+1 quotes -> n quotes plus closes the quoted string
* (1+) 3n+2 quotes -> n+1 quotes plus closes the quoted string
* - in unquoted strings, the first quote opens the quoted string and the
* remaining consecutive quotes follow the above rule.
*/
LPSTR WINAPI *CommandLineToArgvA(LPCSTR lpCmdline, int *numargs) {
DWORD argc;
LPSTR *argv;
LPCSTR s;
LPSTR d;
LPSTR cmdline;
int qcount, bcount;
if (!numargs) {
SetLastError(ERROR_INVALID_PARAMETER);
return NULL;
}
if (lpCmdline == NULL || *lpCmdline == 0) {
/* Return the path to the executable */
DWORD len, deslen = MAX_PATH, size;
size = sizeof(LPSTR) * 2 + deslen * sizeof(char);
for (;;) {
if (!(argv = LocalAlloc(LMEM_FIXED, size)))
return NULL;
len = GetModuleFileNameA(0, (LPSTR)(argv + 2), deslen);
if (!len) {
LocalFree(argv);
return NULL;
}
if (len < deslen)
break;
deslen *= 2;
size = sizeof(LPSTR) * 2 + deslen * sizeof(char);
LocalFree(argv);
}
argv[0] = (LPSTR)(argv + 2);
argv[1] = NULL;
*numargs = 1;
return argv;
}
/* --- First count the arguments */
argc = 1;
s = lpCmdline;
/* The first argument, the executable path, follows special rules */
if (*s == '"') {
/* The executable path ends at the next quote, no matter what */
s++;
while (*s)
if (*s++ == '"')
break;
} else {
/* The executable path ends at the next space, no matter what */
while (*s && *s != ' ' && *s != '\t')
s++;
}
/* skip to the first argument, if any */
while (*s == ' ' || *s == '\t')
s++;
if (*s)
argc++;
/* Analyze the remaining arguments */
qcount = bcount = 0;
while (*s) {
if ((*s == ' ' || *s == '\t') && qcount == 0) {
/* skip to the next argument and count it if any */
while (*s == ' ' || *s == '\t')
s++;
if (*s)
argc++;
bcount = 0;
} else if (*s == '\\') {
/* '\', count them */
bcount++;
s++;
} else if (*s == '"') {
/* '"' */
if ((bcount & 1) == 0)
qcount++; /* unescaped '"' */
s++;
bcount = 0;
/* consecutive quotes, see comment in copying code below */
while (*s == '"') {
qcount++;
s++;
}
qcount = qcount % 3;
if (qcount == 2)
qcount = 0;
} else {
/* a regular character */
bcount = 0;
s++;
}
}
/* Allocate in a single lump, the string array, and the strings that go
* with it. This way the caller can make a single LocalFree() call to free
* both, as per MSDN.
*/
argv = LocalAlloc(LMEM_FIXED, (argc + 1) * sizeof(LPSTR) +
(strlen(lpCmdline) + 1) * sizeof(char));
if (!argv)
return NULL;
cmdline = (LPSTR)(argv + argc + 1);
strcpy(cmdline, lpCmdline);
/* --- Then split and copy the arguments */
argv[0] = d = cmdline;
argc = 1;
/* The first argument, the executable path, follows special rules */
if (*d == '"') {
/* The executable path ends at the next quote, no matter what */
s = d + 1;
while (*s) {
if (*s == '"') {
s++;
break;
}
*d++ = *s++;
}
} else {
/* The executable path ends at the next space, no matter what */
while (*d && *d != ' ' && *d != '\t')
d++;
s = d;
if (*s)
s++;
}
/* close the executable path */
*d++ = 0;
/* skip to the first argument and initialize it if any */
while (*s == ' ' || *s == '\t')
s++;
if (!*s) {
/* There are no parameters so we are all done */
argv[argc] = NULL;
*numargs = (int) argc;
return argv;
}
/* Split and copy the remaining arguments */
argv[argc++] = d;
qcount = bcount = 0;
while (*s) {
if ((*s == ' ' || *s == '\t') && qcount == 0) {
/* close the argument */
*d++ = 0;
bcount = 0;
/* skip to the next one and initialize it if any */
do {
s++;
} while (*s == ' ' || *s == '\t');
if (*s)
argv[argc++] = d;
} else if (*s == '\\') {
*d++ = *s++;
bcount++;
} else if (*s == '"') {
if ((bcount & 1) == 0) {
/* Preceded by an even number of '\', this is half that
* number of '\', plus a quote which we erase.
*/
d -= bcount / 2;
qcount++;
} else {
/* Preceded by an odd number of '\', this is half that
* number of '\' followed by a '"'
*/
d = d - bcount / 2 - 1;
*d++ = '"';
}
s++;
bcount = 0;
/* Now count the number of consecutive quotes. Note that qcount
* already takes into account the opening quote if any, as well as
* the quote that lead us here.
*/
while (*s == '"') {
if (++qcount == 3) {
*d++ = '"';
qcount = 0;
}
s++;
}
if (qcount == 2)
qcount = 0;
} else {
/* a regular character */
*d++ = *s++;
bcount = 0;
}
}
*d = '\0';
argv[argc] = NULL;
*numargs = (int) argc;
return argv;
}
#endif

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# Prerequisites
*.d
# Object files
*.o
*.ko
*.obj
*.elf
# Linker output
*.ilk
*.map
*.exp
# Precompiled Headers
*.gch
*.pch
# Libraries
*.lib
*.a
*.la
*.lo
# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib
# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
# Debug files
*.dSYM/
*.su
*.idb
*.pdb
# Kernel Module Compile Results
*.mod*
*.cmd
.tmp_versions/
modules.order
Module.symvers
Mkfile.old
dkms.conf
# pak file
*.pak
# pak unpacked files
tests/*
# builds
build_*/*
# codeblocks
bin/*
obj/*
*.cbp
*.depend
*.layout

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#if defined(_WIN32) && defined(_LGPL)
#include "main.h"
#endif
#include "pak_defs.h"
#include "pak_file.h"
#include "pak_file_io.h"
#include "pak_get_file_type.h"
#include "pak_header.h"
#include "pak_pack.h"
#define HELP_TEXT \
"Pack/Unpack chrome pak file.\n\n" \
"%s -u pak_file destination_path\n" \
"Unpack chrome pak file at pak_file to destination_path.\n\n" \
"%s -p pak_index_file destination_pak_file\n" \
"Pack chrome pak file using pak_index_file to destination_pak_file.\n" \
"pak_index_file would be found in unpacked path.\n" \
"\nNote: existing destination files would be overwritten\n"
void printHelp() {
// get self path
char selfName[PATH_MAX];
#ifdef _WIN32
GetModuleFileName(NULL, selfName, PATH_MAX);
// get file name from path
const char *ptr = strrchr(selfName, '\\');
#else
int ret = readlink("/proc/self/exe", selfName, sizeof(selfName) - 1);
if (ret == -1)
strcpy(selfName, "pak");
else
selfName[ret] = 0;
// get file name from path
const char *ptr = strrchr(selfName, '/');
#endif
if (ptr != NULL)
strcpy(selfName, ptr + 1);
printf(HELP_TEXT, selfName, selfName);
}
int pakUnpackPath(char *pakFilePath, char *outputPath) {
PakFile pakFile = readFile(pakFilePath);
if (pakFile.buffer == NULL) {
printf("Error: cannot read pak file %s", pakFilePath);
return 1;
}
MyPakHeader myHeader;
if (!pakParseHeader(pakFile.buffer, &myHeader)) {
return 2;
}
if (!pakCheckFormat(pakFile.buffer, pakFile.size)) {
return 3;
}
if (!pakUnpack(pakFile.buffer, outputPath)) {
freeFile(pakFile);
return 4;
}
freeFile(pakFile);
return 0;
}
int pakPackIndexFile(char *indexPath, char *outputFilePath) {
int returnCode = 0;
PakFile pakPackedFile = NULL_File;
PakFile pakIndexFile = NULL_File;
char *filesPath = NULL;
bool freeFilesPath = false;
char *outputFilePath2 = NULL;
char *index = strrchr(indexPath, '\\');
if (index == NULL) {
index = strrchr(indexPath, '/');
}
if (index != NULL && index > indexPath) {
filesPath = calloc(index - indexPath + 2, sizeof(char));
if (filesPath == NULL) {
returnCode = 5;
goto PAK_PACK_INDEX_END;
}
strncpy(filesPath, indexPath, index - indexPath + 1);
freeFilesPath = true;
} else {
filesPath = "";
}
pakIndexFile = readFile(indexPath);
if (pakIndexFile.buffer == NULL) {
printf("Error: cannot read file %s", indexPath);
returnCode = 6;
goto PAK_PACK_INDEX_END;
}
// workaround outputFilePath="" after pakPack()
outputFilePath2 = calloc(strlen(outputFilePath) + 1, sizeof(char));
if (outputFilePath2 == NULL) {
returnCode = 7;
goto PAK_PACK_INDEX_END;
}
strcpy(outputFilePath2, outputFilePath);
pakPackedFile = pakPack(pakIndexFile, filesPath);
if (pakPackedFile.buffer == NULL) {
returnCode = 8;
goto PAK_PACK_INDEX_END;
}
if (!writeFile(outputFilePath2, pakPackedFile)) {
printf("Error: cannot write to %s", outputFilePath2);
returnCode = 9;
goto PAK_PACK_INDEX_END;
}
PAK_PACK_INDEX_END:
if (pakIndexFile.buffer != NULL)
freeFile(pakIndexFile);
if (pakPackedFile.buffer != NULL)
freeFile(pakPackedFile);
if (outputFilePath2 != NULL)
free(outputFilePath2);
if (freeFilesPath && filesPath != NULL)
free(filesPath);
return returnCode;
}
#define PAK_FLAGS_HELP 0
#define PAK_FLAGS_UNPACK 1
#define PAK_FLAGS_PACK 2
int main(int argc, char *argv[]) {
uint32_t flags = 0;
bool process = false;
char path1[PATH_MAX];
memset(path1, 0, PATH_MAX);
char path2[PATH_MAX];
memset(path2, 0, PATH_MAX);
for (int i = 1; i < argc; i++) {
char *arg = argv[i];
bool isConfig = false;
if (*arg != '\0' && (*arg == '/' || *arg == '-')) {
arg++;
isConfig = true;
}
if (isConfig) {
switch (*arg) {
case 'h':
flags = PAK_FLAGS_HELP;
break;
case 'a':
case 'p':
flags = PAK_FLAGS_PACK;
break;
case 'u':
case 'e':
case 'x':
flags = PAK_FLAGS_UNPACK;
break;
}
}
if ((flags == PAK_FLAGS_UNPACK || flags == PAK_FLAGS_PACK) &&
argc - i > 2) {
strcpy(path1, argv[i + 1]);
strcpy(path2, argv[i + 2]);
process = true;
break;
}
}
if (flags == PAK_FLAGS_HELP || !process) {
printHelp();
return 0;
}
if (flags == PAK_FLAGS_UNPACK) {
return pakUnpackPath(path1, path2);
} else if (flags == PAK_FLAGS_PACK) {
return pakPackIndexFile(path1, path2);
}
return 32;
}

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// Small alternative startfile for main()
// Build with gcc perms:
// -nostartfiles
#pragma once
#ifndef STARTFILE_MAIN_H
#define STARTFILE_MAIN_H
#include <windows.h>
#ifdef UNICODE
#define wmain(argc, argv) _wmain(argc, argv)
int wmain(int argc, wchar_t *argv[]);
#else
#include "commandlinetoargva.h"
// workaround undefined reference to `_pei386_runtime_relocator'
#define main(argc, argv) _main(argc, argv)
int main(int argc, char *argv[]);
#endif
int __cdecl mainCRTStartup() {
int __arg_c;
#ifdef UNICODE
wchar_t **__arg_v = CommandLineToArgvW(GetCommandLineW(), &__arg_c);
const int exitCode = wmain(__arg_c, __arg_v);
#else
char **__arg_v = CommandLineToArgvA(GetCommandLineA(), &__arg_c);
const int exitCode = main(__arg_c, __arg_v);
#endif
LocalFree(__arg_v);
ExitProcess((UINT) exitCode);
return exitCode;
}
#endif

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@echo off
setlocal EnableExtensions EnableDelayedExpansion
if exist "%SystemRoot%\SysWOW64\cmd.exe" set x64=1
pushd "%~dp0"
set core_x64=pak_mingw64.exe
if not exist "%core_x64%" if exist pak_msvc64.exe set core_x64=pak_msvc64.exe
set core_x86=pak_mingw32.exe
if not exist "%core_x86%" if exist pak_msvc32.exe set core_x86=pak_msvc32.exe
set "WORK_DIR=%~dp0"
set "file=%~1"
set "pack_file=%~dpn1_packed.pak"
if not exist "%WORK_DIR%" md "%WORK_DIR%"
pushd "%WORK_DIR%"
if "%x64%"=="1" ( set core=%core_x64% ) else ( set core=%core_x86% )
if not exist %core% echo core program (%core%) NOT FOUND! &pause &exit
if exist "%file%" %core% -p "%file%" "%pack_file%"
if exist "%pack_file%" echo packed "%pack_file%" from "%file%"
timeout /t 5||pause

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#pragma once
#ifndef __PAK_DEFINITIONS_H__
#define __PAK_DEFINITIONS_H__
// msvc hacks
#ifdef _MSC_VER
#include <windows.h>
#define ftello ftell
#define fseeko fseek
#define PATH_MAX MAX_PATH
#endif
// linux header
#ifdef __linux__
#include <linux/limits.h>
#include <unistd.h>
#endif
// macOS headers
#ifdef __APPLE__
#include <sys/syslimits.h>
#include <unistd.h>
#endif
#include <stdbool.h>
#include <stdint.h>
#pragma pack(push)
#pragma pack(1)
// v5 header:
// uint32(version), uint8(encoding), 3 bytes padding,
// uint16(resource_count), uint16(alias_count)
typedef struct PakHeaderV5 {
uint32_t version;
uint8_t encoding;
uint8_t _padding[3];
uint16_t resource_count;
uint16_t alias_count;
} PakHeaderV5;
// v4 header: uint32(version), uint32(resource_count), uint8(encoding)
typedef struct PakHeaderV4 {
uint32_t version;
uint32_t resource_count;
uint8_t encoding;
} PakHeaderV4;
// Entry: uint16_t resourceId; uint32_t offset;
typedef struct PakEntry {
uint16_t resource_id;
uint32_t offset;
} PakEntry;
// Alias: uint16_t resourceId; uint16_t entry_index;
typedef struct PakAlias {
uint16_t resource_id;
uint16_t entry_index;
} PakAlias;
#pragma pack(pop)
/**
* Get pak version from pak buffer.
* @param void *buffer - pointer to pak.
* @return uint32_t - pak version.
*/
#define pakGetVerison(buffer) (*(uint32_t *)(buffer))
#define PAK_HEADER_SIZE_V4 sizeof(PakHeaderV4)
#define PAK_HEADER_SIZE_V5 sizeof(PakHeaderV5)
#define PAK_ENTRY_SIZE sizeof(PakEntry)
#define PAK_ALIAS_SIZE sizeof(PakAlias)
#define PAK_ERROR_UNKNOWN_VER "Error: Unknown pak version."
#define PAK_ERROR_TRUNCATED "Error: Probably truncated pak file."
#define PAK_ERROR_BROKEN_INDEX "Error: Probably broken pak index file."
typedef struct MyPakHeader {
uint32_t version;
uint32_t resource_count;
uint16_t alias_count;
uint8_t encoding;
uint8_t size;
} MyPakHeader;
typedef struct PakFile {
uint16_t id;
uint32_t size;
void *buffer;
} PakFile;
// file-io
#define NULL_File ((PakFile){0, 0, NULL})
#define freeFile(file) (free((file).buffer))
// pack/unpack
#define PAK_BUFFER_BLOCK_SIZE 4096
#define PAK_BUFFER_MIN_FREE_SIZE 512
#define PAK_INDEX_GLOBAL_TAG "[Global]"
#define PAK_INDEX_RES_TAG "[Resources]"
#define PAK_INDEX_ALIAS_TAG "[Alias]"
#endif // __PAK_DEFINITIONS_H__

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#include "pak_file.h"
PakFile pakPackFiles(MyPakHeader *myHeader, PakFile *pakResFile,
PakAlias *pakAlias) {
uint8_t *buffer = NULL;
uint32_t size = myHeader->size;
uint32_t entrySize = (myHeader->resource_count + 1) * PAK_ENTRY_SIZE;
uint32_t aliasSize = myHeader->alias_count * PAK_ALIAS_SIZE;
size += entrySize + aliasSize;
for (uint32_t i = 0; i < myHeader->resource_count; i++) {
size += (pakResFile + i)->size;
}
buffer = calloc(size, sizeof(uint8_t));
if (buffer == NULL)
return NULL_File;
uint32_t offset = pakWriteHeader(myHeader, buffer);
if (offset == 0) {
free(buffer);
return NULL_File;
}
PakEntry *enrtyPtr = (PakEntry *)(buffer + offset);
uint8_t *filePtr = buffer + offset + entrySize + aliasSize;
for (uint32_t i = 0; i < myHeader->resource_count; i++) {
memcpy(filePtr, pakResFile->buffer, pakResFile->size);
enrtyPtr->resource_id = pakResFile->id;
enrtyPtr->offset = filePtr - buffer;
filePtr += pakResFile->size;
enrtyPtr++;
pakResFile++;
}
enrtyPtr->resource_id = 0;
enrtyPtr->offset = (pakResFile - 1)->size + (enrtyPtr - 1)->offset;
void *aliasPtr = (void *)(enrtyPtr + 1);
memcpy(aliasPtr, pakAlias, aliasSize);
PakFile pakFile;
pakFile.buffer = buffer;
pakFile.size = size;
return pakFile;
}
PakFile pakGetFile(uint8_t *pakBuffer, uint16_t id) {
PakFile pakFile = NULL_File;
MyPakHeader myHeader;
if (!pakParseHeader(pakBuffer, &myHeader)) {
return NULL_File;
}
PakEntry *entryPtr = (PakEntry *)(pakBuffer + myHeader.size);
if (myHeader.version == 5) {
PakAlias *aliasPtr =
(PakAlias *)(pakBuffer + myHeader.size +
(myHeader.resource_count + 1) * PAK_ENTRY_SIZE);
for (uint16_t i = 0; i < myHeader.alias_count; i++) {
if (aliasPtr->resource_id == id) {
entryPtr += aliasPtr->entry_index;
pakFile.buffer = pakBuffer + entryPtr->offset;
pakFile.size = (entryPtr + 1)->offset - entryPtr->offset;
return pakFile;
}
}
}
for (uint32_t i = 0; i < myHeader.resource_count; i++) {
if (entryPtr->resource_id == id) {
pakFile.buffer = pakBuffer + entryPtr->offset;
pakFile.size = (entryPtr + 1)->offset - entryPtr->offset;
return pakFile;
}
entryPtr++;
}
return NULL_File;
}
PakFile *pakGetFiles(uint8_t *buffer) {
PakFile *pakResFile = NULL;
MyPakHeader myHeader;
if (!pakParseHeader(buffer, &myHeader)) {
return NULL;
}
pakResFile = (PakFile *)calloc(myHeader.resource_count, sizeof(PakFile));
PakFile *returnValue = pakResFile;
if (pakResFile == NULL) {
return NULL;
}
PakEntry *pakEntryPtr = (PakEntry *)(buffer + myHeader.size);
for (uint32_t i = 0; i < myHeader.resource_count; i++) {
uint32_t offset = pakEntryPtr->offset;
pakResFile->id = pakEntryPtr->resource_id;
pakResFile->buffer = buffer + offset;
pakEntryPtr++;
pakResFile->size = pakEntryPtr->offset - offset;
pakResFile++;
}
return returnValue;
}

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#pragma once
#ifndef __PAK_FILE_H__
#define __PAK_FILE_H__
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "pak_defs.h"
#include "pak_header.h"
/**
* Package a pak file, returns NULL_File on failure.
* Note: this would allocate memory.
* @param MyPakHeader *myHeader - pointer to MyPakHeader struct.
* @param PakFile *pakResFile - pointer to all resource files.
* @param PakAlias *pakAlias - pointer to all alias.
* @return PakFile - the packed file.
*/
PakFile pakPackFiles(MyPakHeader *myHeader, PakFile *pakResFile,
PakAlias *pakAlias);
/**
* Get a single file from pak, returns NULL_File on failure.
* @param void *pakBuffer - pointer to pak.
* @param uint16_t *id - target file id.
* @return PakFile - the target file.
*/
PakFile pakGetFile(uint8_t *pakBuffer, uint16_t id);
/**
* Get all files from pak, returns NULL on failure.
* Note: this would allocate memory.
* @param void* buffer - pointer to pak.
* @return PakFile* - pointer to all files in pak.
*/
PakFile *pakGetFiles(uint8_t *buffer);
#endif // __PAK_FILE_H__

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#include "pak_file_io.h"
PakFile readFile(const char *fileName) {
PakFile file;
/* declare a file pointer */
FILE *filePtr = fopen(fileName, "rb");
/* quit if the file does not exist */
if (filePtr == NULL)
return NULL_File;
/* Get the number of bytes */
fseeko(filePtr, 0, SEEK_END);
file.size = (uint32_t) ftello(filePtr);
/* reset the file position indicator to
the beginning of the file */
fseeko(filePtr, 0, SEEK_SET);
/* grab sufficient memory for the
buffer to hold the text */
file.buffer = calloc(file.size + 1, sizeof(uint8_t));
/* memory error */
if (file.buffer == NULL)
return NULL_File;
/* copy all the text into the buffer */
fread(file.buffer, sizeof(uint8_t), file.size, filePtr);
fclose(filePtr);
return file;
}
bool writeFile(const char *fileName, const PakFile file) {
FILE *filePtr = fopen(fileName, "wb");
if (filePtr == NULL)
return false;
const size_t result = fwrite(file.buffer, sizeof(uint8_t), file.size, filePtr);
fclose(filePtr);
return (result == file.size);
}

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#pragma once
#ifndef __PAK_FILE_IO_H__
#define __PAK_FILE_IO_H__
#include "pak_defs.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
/**
* Read a file into memory, returns NULL_File on failure.
* Note: this would allocate memory.
* @param const char *fileName - target file name.
* @return PakFile - target file content.
*/
PakFile readFile(const char *fileName);
/**
* Write a file to storage, this would overwrite existing file.
* @param const char *fileName - target file name.
* @param PakFile file - target file content.
* @return bool - succeed or not.
*/
bool writeFile(const char *fileName, const PakFile file);
#endif // __PAK_FILE_IO_H__

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#include "pak_get_file_type.h"
static const FileType FILE_TYPES[] = {
PAK_GEN_FILE_TYPE(".png", "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A"),
PAK_GEN_FILE_TYPE(".html", "<!doctype html>"),
PAK_GEN_FILE_TYPE(".html", "<!DOCTYPE html>"),
PAK_GEN_FILE_TYPE(".html", "<html>"),
PAK_GEN_FILE_TYPE(".html", "<!--"),
PAK_GEN_FILE_TYPE(".html", "<link"),
PAK_GEN_FILE_TYPE(".svg", "<svg "),
PAK_GEN_FILE_TYPE(".js", "// "),
PAK_GEN_FILE_TYPE(".js", "(function"),
PAK_GEN_FILE_TYPE(".css", "/*"),
PAK_GEN_FILE_TYPE(".json", "{"),
PAK_GEN_FILE_TYPE(".gz", "\x1f\x8b")};
static const unsigned int FILE_TYPE_COUNT =
sizeof(FILE_TYPES) / sizeof(FileType);
char *pakGetFileType(PakFile file) {
for (unsigned int i = 0; i < FILE_TYPE_COUNT; i++)
if (file.size > FILE_TYPES[i].size &&
memcmp(file.buffer, FILE_TYPES[i].identifer, FILE_TYPES[i].size) ==
0)
return FILE_TYPES[i].type;
return "";
}

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#pragma once
#ifndef __PAK_GET_FILE_TYPE_H__
#define __PAK_GET_FILE_TYPE_H__
#include "pak_defs.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
typedef struct FileType {
char *type;
char *identifer;
uint8_t size;
} FileType;
/**
* Generate a FileType, for internal uses only.
* @param char* type - file extension.
* @param char* identifer - file header identifer in string.
* @see pakGetFileType()
* @return FileType
*/
#define PAK_GEN_FILE_TYPE(type, identifer) \
{type, identifer, sizeof(identifer) - 1}
/**
* Get file extension form a file, returns "" on failure.
* @param PakFile file - the file to parse.
* @return char* - pointer to file extension.
*/
char *pakGetFileType(PakFile file);
#endif // __PAK_GET_FILE_TYPE_H__

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#include "pak_header.h"
bool pakParseHeader(void *buffer, MyPakHeader *myHeader) {
memset(myHeader, 0, sizeof(MyPakHeader));
myHeader->version = pakGetVerison(buffer);
if (myHeader->version == 5) {
PakHeaderV5 *header = (PakHeaderV5 *)buffer;
myHeader->resource_count = header->resource_count;
myHeader->encoding = header->encoding;
myHeader->alias_count = header->alias_count;
myHeader->size = PAK_HEADER_SIZE_V5;
} else if (myHeader->version == 4) {
PakHeaderV4 *header = (PakHeaderV4 *)buffer;
myHeader->resource_count = header->resource_count;
myHeader->encoding = header->encoding;
myHeader->alias_count = 0;
myHeader->size = PAK_HEADER_SIZE_V4;
} else {
puts(PAK_ERROR_UNKNOWN_VER);
return false;
}
return true;
}
unsigned int pakWriteHeader(MyPakHeader *myHeader, void *buffer) {
if (buffer == NULL || myHeader == NULL)
return 0;
if (myHeader->version == 5) {
PakHeaderV5 *header = (PakHeaderV5 *)buffer;
header->version = myHeader->version;
header->resource_count = (uint16_t) myHeader->resource_count;
header->encoding = myHeader->encoding;
header->alias_count = myHeader->alias_count;
} else if (myHeader->version == 4) {
PakHeaderV4 *header = (PakHeaderV4 *)buffer;
header->version = myHeader->version;
header->resource_count = myHeader->resource_count;
header->encoding = myHeader->encoding;
} else {
puts(PAK_ERROR_UNKNOWN_VER);
return 0;
}
return myHeader->size;
}
bool pakCheckFormat(uint8_t *buffer, unsigned int size) {
MyPakHeader myHeader;
if (!pakParseHeader(buffer, &myHeader)) {
return false;
}
if (size < myHeader.size + (myHeader.resource_count + 1) * PAK_ENTRY_SIZE +
myHeader.alias_count * PAK_ALIAS_SIZE) {
puts(PAK_ERROR_TRUNCATED);
return false;
}
PakEntry *entryPtr = (PakEntry *)(buffer + myHeader.size);
for (unsigned int i = 0; i <= myHeader.resource_count; i++) {
uint32_t offset = entryPtr->offset;
if (size < offset) {
puts(PAK_ERROR_TRUNCATED);
return false;
}
entryPtr++;
}
return true;
}

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#pragma once
#ifndef __PAK_HEADERS_H__
#define __PAK_HEADERS_H__
#include "pak_defs.h"
#include <stdio.h>
#include <string.h>
/**
* Generate MyPakHeader struct from pak buffer.
* @param _in_ void *buffer - pointer to pak buffer.
* @param _out_ MyPakHeader myHeader - target file content.
* @return bool - succeed or not.
*/
bool pakParseHeader(void *buffer, MyPakHeader *myHeader);
/**
* Write pak header from MyPakHeader struct to buffer.
* @param MyPakHeader myHeader - target MyPakHeader struct.
* @param void *buffer - pointer to target pak buffer.
* @return unsigned int - pak header size, 0 on failure.
*/
unsigned int pakWriteHeader(MyPakHeader *myHeader, void *buffer);
/**
* Check if pak format is legal.
* @param void *buffer - pointer to pak buffer.
* @param unsigned int size - pak buffer size in bytes.
* @return bool - succeed or not.
*/
bool pakCheckFormat(uint8_t *buffer, unsigned int size);
#endif // __PAK_HEADERS_H__

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#include "pak_pack.h"
bool pakUnpack(uint8_t *buffer, char *outputPath) {
MyPakHeader myHeader;
if (!pakParseHeader(buffer, &myHeader)) {
return false;
}
PakFile *files = pakGetFiles(buffer);
if (files == NULL) {
return false;
}
char fileNameBuf[FILENAME_MAX];
memset(fileNameBuf, 0, FILENAME_MAX);
char pathBuf[PATH_MAX + 2];
memset(pathBuf, 0, PATH_MAX);
#ifdef _WIN32
CreateDirectory(outputPath, NULL);
#else
mkdir(outputPath, 0777);
#endif
char *pakIndexStr = calloc(PAK_BUFFER_BLOCK_SIZE, sizeof(char));
if (pakIndexStr == NULL) {
free(files);
return false;
}
uint32_t offset = 0;
uint32_t length = PAK_BUFFER_BLOCK_SIZE;
offset +=
sprintf(pakIndexStr + offset, PAK_INDEX_GLOBAL_TAG "\r\nversion=%u\r\n",
myHeader.version);
offset += sprintf(pakIndexStr + offset,
"encoding=%u\r\n\r\n" PAK_INDEX_RES_TAG "\r\n",
myHeader.encoding);
for (uint32_t i = 0; i < myHeader.resource_count; i++) {
sprintf(fileNameBuf, "%u%s", files[i].id, pakGetFileType(files[i]));
offset += sprintf(pakIndexStr + offset, "%u=%s\r\n", files[i].id,
fileNameBuf);
if (length - offset < PAK_BUFFER_MIN_FREE_SIZE) {
pakIndexStr = realloc(pakIndexStr, length + PAK_BUFFER_BLOCK_SIZE);
length += PAK_BUFFER_BLOCK_SIZE;
}
sprintf(pathBuf, "%s/%s", outputPath, fileNameBuf);
writeFile(pathBuf, files[i]);
}
PakAlias *aliasBuf = NULL;
if (myHeader.alias_count > 0) {
offset +=
sprintf(pakIndexStr + offset, "\r\n" PAK_INDEX_ALIAS_TAG "\r\n");
aliasBuf = (PakAlias *)(buffer + myHeader.size +
(myHeader.resource_count + 1) * PAK_ENTRY_SIZE);
}
for (unsigned int i = 0; i < myHeader.alias_count; i++) {
offset += sprintf(pakIndexStr + offset, "%u=%u\r\n",
aliasBuf->resource_id, aliasBuf->entry_index);
aliasBuf++;
if (length - offset < PAK_BUFFER_MIN_FREE_SIZE) {
pakIndexStr = realloc(pakIndexStr, length + PAK_BUFFER_BLOCK_SIZE);
length += PAK_BUFFER_BLOCK_SIZE;
}
}
PakFile pakIndexBuf;
// puts(pakIndexStr);
pakIndexBuf.buffer = pakIndexStr;
pakIndexBuf.size = offset;
sprintf(pathBuf, "%s/pak_index.ini", outputPath);
writeFile(pathBuf, pakIndexBuf);
freeFile(pakIndexBuf);
free(files);
return true;
}
uint32_t countChar(const char *string, uint32_t length, char toCount) {
uint32_t count = 0;
for (uint32_t i = 0; i < length; i++) {
if (string[i] == toCount)
count++;
}
return count;
}
PakFile pakPack(PakFile pakIndex, char *path) { // TODO
MyPakHeader myHeader;
memset(&myHeader, 0, sizeof(myHeader));
char *pakIndexBuf = pakIndex.buffer;
PakFile pakFile = NULL_File;
PakFile *resFiles = NULL;
PakAlias *pakAlias = NULL;
uint32_t count = 0;
uint32_t offset = sizeof(PAK_INDEX_GLOBAL_TAG) - 1;
sscanf(pakIndexBuf + offset, " version=%u%n", &myHeader.version, &count);
if (count == 0) {
goto PAK_PACK_END;
}
offset += count;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat"
#pragma GCC diagnostic ignored "-Wformat-extra-args"
sscanf(pakIndexBuf + offset, " encoding=%hhu%n", &myHeader.encoding,
&count);
#pragma GCC diagnostic pop
// printf("version=%u\nencoding=%u\n", myHeader.version,
// myHeader.encoding);
if (myHeader.version == 5) {
myHeader.size = PAK_HEADER_SIZE_V5;
} else if (myHeader.version == 4) {
myHeader.size = PAK_HEADER_SIZE_V4;
} else {
puts(PAK_ERROR_UNKNOWN_VER);
goto PAK_PACK_END;
}
char *pakIndexEnd = pakIndexBuf + pakIndex.size - 1;
char *pakEntryIndex =
strstr(pakIndexBuf, PAK_INDEX_RES_TAG) + sizeof(PAK_INDEX_RES_TAG) - 1;
char *pakAliasIndex = strstr(pakIndexBuf, PAK_INDEX_ALIAS_TAG);
if (myHeader.version == 4 || pakAliasIndex == NULL) {
myHeader.alias_count = 0;
pakAliasIndex = pakIndexEnd;
} else {
pakAliasIndex += sizeof(PAK_INDEX_ALIAS_TAG) - 1;
myHeader.alias_count =
(uint16_t) countChar(pakAliasIndex, pakIndexEnd - pakAliasIndex, '=');
}
myHeader.resource_count =
countChar(pakEntryIndex, pakAliasIndex - pakEntryIndex, '=');
// printf("resource_count=%u\nalias_count=%u\n", myHeader.resource_count,
// myHeader.alias_count);
char fileNameBuf[FILENAME_MAX];
memset(fileNameBuf, 0, FILENAME_MAX);
char pathBuf[PATH_MAX];
memset(pathBuf, 0, PATH_MAX);
resFiles = calloc(myHeader.resource_count, sizeof(PakFile));
if (resFiles == NULL) {
goto PAK_PACK_END;
}
offset = 0;
for (uint32_t i = 0; i < myHeader.resource_count; i++) {
uint32_t id = 0;
sscanf(pakEntryIndex + offset, " %u=%s%n ", &id, fileNameBuf, &count);
if (count == 0 || sprintf(pathBuf, "%s%s", path, fileNameBuf) == 0) {
puts(PAK_ERROR_BROKEN_INDEX);
myHeader.resource_count = i;
goto PAK_PACK_END;
}
offset += count;
resFiles[i] = readFile(pathBuf);
if (resFiles[i].buffer == NULL) {
puts(PAK_ERROR_BROKEN_INDEX);
myHeader.resource_count = i;
goto PAK_PACK_END;
}
resFiles[i].id = (uint16_t) id;
// printf("id=%u\tfile_name=%s\tpath=%s\tsize=%u\n",id,
// fileNameBuf, pathBuf, resFiles[i].size);
}
if (myHeader.alias_count > 0) {
offset = 0;
pakAlias = calloc(myHeader.alias_count, sizeof(PakAlias));
if (pakAlias == NULL) {
goto PAK_PACK_END;
}
for (uint32_t i = 0; i < myHeader.alias_count; i++) {
sscanf(pakAliasIndex + offset, " %hu=%hu%n ",
&pakAlias[i].resource_id, &pakAlias[i].entry_index, &count);
if (count == 0) {
puts(PAK_ERROR_BROKEN_INDEX);
goto PAK_PACK_END;
}
offset += count;
// printf("resource_id=%hu\tentry_index=%hu\n",pakAlias[i].resource_id,
// pakAlias[i].entry_index);
}
}
pakFile = pakPackFiles(&myHeader, resFiles, pakAlias);
printf("\nresource_count=%u\nalias_count=%u\n", myHeader.resource_count,
myHeader.alias_count);
printf("version=%u\nencoding=%u\n", myHeader.version, myHeader.encoding);
printf("\npak size: %u\n", pakFile.size);
PAK_PACK_END:
if (resFiles != NULL) {
for (uint32_t i = 0; i < myHeader.resource_count; i++) {
if (resFiles[i].buffer != NULL)
free(resFiles[i].buffer);
}
free(resFiles);
}
if (pakAlias != NULL)
free(pakAlias);
return pakFile;
}

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#pragma once
#ifndef __PAK_PACKER_UNPACKER_H__
#define __PAK_PACKER_UNPACKER_H__
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/stat.h>
#include <sys/types.h>
#endif
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "pak_defs.h"
#include "pak_file.h"
#include "pak_file_io.h"
#include "pak_get_file_type.h"
#include "pak_header.h"
/**
* Unpack a pak file to target path.
* @param void *buffer - pointer to target pak buffer.
* @param char *outputPath - target path.
* @return bool - succeed or not.
*/
bool pakUnpack(uint8_t *buffer, char *outputPath);
/**
* Pack a pak file from target index (ini) file,
* returns NULL_File on failure.
* Note: this would allocate memory.
* @param PakFile pakIndex - target pak index file.
* @param char *path - target path.
* @return PakFile - packed pak.
*/
PakFile pakPack(PakFile pakIndex, char *path);
/**
* Count number of specified char in string.
* @param char *string - target string.
* @param uint32_t length - target string length.
* @param char toCount - specified char to count.
* @return uint32_t - number of specified char.
*/
uint32_t countChar(const char *string, uint32_t length, char toCount);
#endif // __PAK_PACKER_UNPACKER_H__

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#!/bin/bash
MACHINE="$(gcc -dumpmachine)"
echo Building...
mkdir -p "build_${MACHINE}"
cd "build_${MACHINE}"
rm -f *.pak
cmake -GNinja ..
ninja
echo Testing...
for i in $(ls ../tests | grep pak | cut -f1 -d '.')
do
./pak -u "../tests/${i}.pak" "./${i}_unpacked"
./pak -p "./${i}_unpacked/pak_index.ini" "${i}_repacked.pak"
cmp "../tests/${i}.pak" "${i}_repacked.pak" && rm -rf "./${i}_unpacked"
done
cd ..

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@echo off
setlocal EnableExtensions EnableDelayedExpansion
if exist "%SystemRoot%\SysWOW64\cmd.exe" set x64=1
pushd "%~dp0"
set core_x64=pak_mingw64.exe
if not exist "%core_x64%" if exist pak_msvc64.exe set core_x64=pak_msvc64.exe
set core_x86=pak_mingw32.exe
if not exist "%core_x86%" if exist pak_msvc32.exe set core_x86=pak_msvc32.exe
set "WORK_DIR=%~dp0"
set "file=%~1"
set unpack_dir=%~dpn1_unpacked
if not exist "%WORK_DIR%" md "%WORK_DIR%"
pushd "%WORK_DIR%"
if "%x64%"=="1" ( set core=%core_x64% ) else ( set core=%core_x86% )
if not exist %core% echo core program (%core%) NOT FOUND! &pause &exit
if not exist "%unpack_dir%" md "%unpack_dir%"
if exist "%file%" %core% -u "%file%" "%unpack_dir%"
if exist "%unpack_dir%\pak_index.ini" echo Unpacked "%file%" to "%unpack_dir%"
timeout /t 5||pause