lzo

The GPL-free, safe, no_std pure-Rust LZO1X decompressor. Decode lzo1x data — from lzop files, the Linux kernel/initramfs, btrfs, or any tool built on liblzo2 — with zero C, zero dependencies, and #![forbid(unsafe_code)].

// "hello, lzo world!" as a raw LZO1X block (from liblzo2's lzo1x_1).
let block = [34, 104,101,108,108,111,44,32,108,122,111,32,119,111,114,108,100,33, 17,0,0];
let mut out = [0u8; 17];                 // you supply the output capacity
let n = lzo::decompress_into(&block, &mut out).unwrap();
assert_eq!(&out[..n], b"hello, lzo world!");

That's it: hand it a raw block and a big-enough buffer, get the bytes back.

Why this crate

Pure-Rust LZO ports already exist — but the mature ones (rust-lzo, lzo1x) are GPL-2.0, which can't be linked into an MIT/Apache project, and the MIT alternatives wrap C or are early-stage. lzo fills that gap:

It decodes streams from every lzo1x compressor variant (lzo1x_1, lzo1x_1_15, lzo1x_999) — they share one decompressor. Hardened against malformed input: bounds-checked, never panics, returns a typed [Error].

Scope

• Decompression only (v1). Like ruzstd/bzip2-rs, this is a decoder; raw LZO1X has no container, so you supply the output capacity (mirroring C lzo1x_decompress_safe).
• Standard lzo1x streams. The kernel's bitstream-version (RLE) extension is out of scope.

Correctness

Every release is round-trip tested against vectors produced by the reference C liblzo2 lzo1x_1_compress (covering literals, the zero-byte length extension, M1–M4 matches, overlapping copies, and the end-of-stream marker), plus malformed-input tests asserting no panic on arbitrary bytes.

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