orz -- a general purpose data compressor written in the crab-lang.

orz is an optimized ROLZ (reduced offset Lempel-Ziv) general purpose data compressor. input data is encoded as ROLZ-matches (reduced-offsets and match lengths), 2-byte words, and single bytes. then all encoded symbols are processed with a symbol ranking (aka Move-to-Front) transformer and a static huffman coder.

benefited from the ROLZ algorithm, orz compresses times faster than many other LZ-based compressors which has same compression ratio, and decompression speed is still very acceptable.

orz is completely implemented in the crab-lang. clone the repo and run cargo build --release to have an executable orz binary.

you can install orz with cargo:

cargo install orz --git https://github.com/richox/orz --tag v1.6.2

for compression:

orz encode <source-file-input> <compressed-file-output>

for decompression:

orz decode <compressed-file-input> <source-file-output>

for more details, see orz --help

benchmark for 100MB of Large Text Compression Benchmark (enwik8, see http://mattmahoney.net/dc/text.html):

(for latest enwik8 benchmark result, see github actions)