zesven

A comprehensive, pure Rust implementation of the 7z archive format with no FFI dependencies. zesven provides full support for reading, writing, and editing 7z archives with a wide range of compression codecs, AES-256 encryption with header encryption, streaming decompression, async APIs, and WebAssembly support.

For detailed documentation, examples, and API reference, visit zesven.akinshin.dev.

Features

Compression Codecs

• LZMA/LZMA2 - Native support with parallel compression variant
• Deflate - Via flate2 with zlib-rs backend
• BZip2 - Full encode/decode support
• PPMd - Prediction by Partial Matching
• Zstd - Modern compression (optional feature)
• Brotli - Google's compression algorithm (optional feature)
• LZ4 - Fast compression (optional feature)
• LZ5/Lizard - Pure Rust implementations

Filters

• Delta - Byte-level delta encoding
• BCJ - x86, ARM, ARM64, ARM Thumb, PowerPC, SPARC, IA-64, RISC-V
• BCJ2 - Complex 4-stream x86 filter

Encryption

• AES-256-CBC with SHA-256 key derivation
• Header encryption - Encrypt filenames and metadata
• Configurable iterations - Tunable key derivation strength

Archive Features

• Solid archives - Read and write
• Multi-volume - .7z.001, .7z.002, etc.
• Self-extracting - Windows PE, Linux ELF, macOS Mach-O detection
• Recovery - Signature scanning and partial recovery
• Random access - For non-solid archives

APIs

• Streaming - Bounded memory with StreamingArchive
• Async - Tokio-based (optional async feature)
• Parallel - Rayon-based (optional parallel feature)
• WASM - Browser-compatible (optional wasm feature)

Safety

• Path traversal protection - Blocks ../, absolute paths, symlink escapes
• Resource limits - Header size, entry count, unpacked size limits
• CRC verification - All entries validated
• Zip bomb prevention - Compression ratio limits

License

Copyright 2026 Andrey Akinshin. Licensed under Apache-2.0 or MIT at your option.