Pack

A library providing packing of files into runtime reading optimized archives, across different platforms.
For example can be used to load game resources. (images, shaders, models, levels, etc...)

See the documentation.

Features

• Compressed file pack creation
• Runtime optimized file pack reading
• Automatic file data deduplication
• Maximum ZSTD compression level
• Customisable compression threshold
• C and C++ implementations

Usage example

void packReaderExampleCPP()
{
    pack::Reader packReader("resources.pack");
    auto itemIndex = packReader.getItemIndex("textures/sky.png");
    std::vector<uint8_t> itemData;
    packReader.readItemData(itemIndex, itemData);
    // use data...
}

void packReaderExampleC()
{
    PackReader packReader = NULL;
    PackResult packResult = createFilePackReader("resources.pack", false, 1, &packReader);
    if (packResult != SUCCESS_PACK_RESULT) abort();

    uint64_t itemIndex = 0;
    bool result = getPackItemIndex(packReader, "textures/sky.png")
    if (!result) abort();

    uint32_t dataSize = getPackItemDataSize(packReader, itemIndex);
    uint8_t* itemData = (uint8_t*)malloc(dataSize);
    if (!itemData) abort();

    packResult = readPackItemData(packReader, itemIndex, itemData, 0)
    if (packResult != SUCCESS_PACK_RESULT) { free(data); abort(); }

    // use data...
    destroyPackReader(packReader);
}

Supported operating systems

• Windows
• macOS
• Ubuntu (Linux)

Build requirements

• C99 compiler
• C++17 compiler (optional)
• Git 2.30+
• CMake 3.16+

Use building instructions to install all required tools and libraries.

CMake options

Name	Description	Default value
PACK_BUILD_SHARED	Build Pack shared library	ON
PACK_BUILD_UTILITIES	Build Pack utility programs	ON
PACK_BUILD_TESTS	Build Pack library tests	ON

CMake targets

Name	Description	Windows	macOS	Linux
pack-static	Static Pack library	.lib	.a	.a
pack-shared	Dynamic Pack library	.dll	.dylib	.so
packer	Packer executable	.exe
unpacker	Unpacker executable	.exe
pack-info	Pack info executable	.exe

Cloning

git clone --recursive https://github.com/cfnptr/pack

Building

• Windows: ./scripts/build-release.bat
• macOS / Ubuntu: ./scripts/build-release.sh

Utilities

packer

Creates compressed data pack from files.

• Usage: packer <pack-path> <file-path-1> <item-path-1>...
• Example: packer resources.pack C:/Users/user/Desktop/sky.png images/sky.png

unpacker

Extracts compressed data pack files.

• Usage: unpacker <pack-path>
• Example: unpacker resources.pack

pack-info

Shows pack file information.

• Usage: pack-info <pack-path>
• Example: pack-info resources.pack

Third-party

• mpio (Apache-2.0 License)
• zstd (BSD License)