bg3rustpaklib

A Rust library for reading, extracting, and creating Baldur's Gate 3 PAK files.

Overview

This library provides functionality for working with Larian Studios' PAK (LSPK) archive format used in Baldur's Gate 3. It is similar to lslib but written in Rust.

Features

• Read PAK files - Supports versions 15, 16, and 18 (BG3 format)
• List and search files - Find files by pattern or search within packages
• Extract files - Extract individual files or entire packages to disk
• Create PAK files - Build new packages from directories
• Compression support - LZ4 and Zstd decompression
• Solid archives - Support for solid archive handling
• Async API - Optional async support via async feature

Usage

Add to your Cargo.toml:

[dependencies]

bg3rustpaklib = "0.1"

Basic Example

use bg3rustpaklib::{Package, PackageSearch};

fn main() -> bg3rustpaklib::Result<()> {
    // Open a PAK file
    let package = Package::open("Game.pak")?;

    // Get package metadata
    let metadata = package.metadata();
    println!("Package version: {}", metadata.version);
    println!("File count: {}", metadata.file_count);

    // List all files
    for file in package.files() {
        println!("{} ({} bytes)", file.name(), file.size());
    }

    // Find files by pattern
    let lsf_files = package.find("**/*.lsf");
    println!("Found {} .lsf files", lsf_files.len());

    // Extract a specific file
    if let Some(file) = package.get("Public/Game/GUI/Assets/Tooltips/tooltip.lsf") {
        let contents = package.read_file(file)?;
        println!("File size: {} bytes", contents.len());
    }

    // Extract all files to a directory
    package.extract_all("output/")?;

    Ok(())
}

Async Support

Enable the async feature for async APIs:

[dependencies]

bg3rustpaklib = { version = "0.1", features = ["async"] }

use bg3rustpaklib::AsyncPackage;

#[tokio::main]
async fn main() -> bg3rustpaklib::Result<()> {
    let package = AsyncPackage::open("Game.pak").await?;
    let metadata = package.metadata().await;
    println!("File count: {}", metadata.file_count);
    Ok(())
}

Command-line Tools

Several example tools are included:

dump_header

Dumps hex view of the first and last 64 bytes of a PAK file:

cargo run --example dump_header path/to/file.pak

detailed_dump

Shows detailed package information including file list:

cargo run --example detailed_dump path/to/file.pak

compare_paks

Compares multiple PAK files and shows their metadata:

cargo run --example compare_paks path/to/pak1.pak path/to/pak2.pak

repack_test

Demonstrates extracting and repacking a PAK file:

cargo run --example repack_test input.pak output.pak

Building

# Build the library

cargo build


# Build with async support

cargo build --features async


# Run tests

cargo test


# Build examples

cargo build --examples

API Reference

See docs.rs for full API documentation.

License

MIT License - see LICENSE file for details.

Credits

Inspired by lslib by Norbyte.