Crate compcol 

compcol — a collection of pure-Rust, no_std, 100% safe compression algorithms behind a uniform streaming trait.

Each algorithm sits behind its own Cargo feature so downstream crates only pay for what they use. An optional factory module provides runtime by-name lookup when the factory (and thus alloc) feature is enabled.

See Encoder, Decoder, and Algorithm for the contract every algorithm in this crate implements.

Modules

adcadc

ADC (Apple Data Compression).

amiga_lzxamiga_lzx

Amiga LZX — the original 1995 Jonathan Forbes LZX codec used by the Amiga .lzx archive format.

arc_cruncharc_crunch

ARC “Crunch” — System Enhancement Associates ARC archiver method 8.

arc_squasharc_squash

ARC “Squashed” — System Enhancement Associates ARC archiver method 9.

arc_squeezearc_squeeze

ARC “Squeeze” — the CP/M SQ/USQ codec, ARC method 4.

arsenicarsenic

StuffIt 5 Arsenic (compression method 15) — decoder only.

bcjbcj

BCJ branch-converter filters (from the public-domain LZMA SDK lineage, as used by xz).

bcj2bcj2

BCJ2 — the 4-stream x86 branch-conversion filter (7-Zip filter id 0303011B), from the public-domain LZMA SDK.

brotlibrotli

Brotli (RFC 7932) — partial-but-functional implementation.

bwtbwt

Burrows–Wheeler Transform (BWT) — a standalone, reversible block codec.

bzip2bzip2

bzip2 (.bz2).

deflatedeflate

RFC 1951 deflate.

deflate64deflate64

PKWARE deflate64 (zip method 9).

deltadelta

Delta filter — byte-wise delta coding with a configurable distance.

factoryfactory

Runtime by-name lookup of algorithms.

gzipgzip

RFC 1952 gzip container around RFC 1951 deflate.

hpackhpack

HTTP/2 HPACK header compression — RFC 7541.

huffman_codechuffman

Standalone canonical (order-0) Huffman codec.

iostd

std::io::Read / std::io::Write adapters around any Encoder/Decoder.

lhalha

LHA / LZH compression methods: -lh1-, -lh2-, -lh4-, -lh5-, -lh6-, -lh7-.

limit

Decompression-bomb defenses.

lz4lz4

LZ4 block format with a tiny multi-block framing for streaming.

lz5lz5

LZ5 / Lizard frame-format codec.

lzahlzah

StuffIt classic compression method 5 (“LZAH”): LZSS sliding window over a pre-seeded 4 KiB dictionary, with a single adaptive (sibling- property) Huffman tree for literal/length tokens and a static canonical prefix code for the high bits of each match offset.

lzfselzfse

LZFSE (Apple’s LZ77 + Finite State Entropy) — decoder only.

lzhamlzham

LZHAM (Lossless ZIP Huffman Arithmetic Modeling) — header parser only.

lzmalzma

LZMA (Lempel–Ziv–Markov chain Algorithm).

lzma2lzma2

Raw LZMA2 decoder (7-Zip coder id 21).

lznt1lznt1

LZNT1 — NTFS native file compression.

lzolzo

LZO1X-1 (Lempel–Ziv–Oberhumer) with a tiny multi-block framing for streaming.

lzslzs

Stac LZS (Lempel–Ziv–Stac) — the LZ77 variant specified by RFC 1974 (PPP Stac LZS Compression Protocol).

lzsslzss

LZSS (Storer–Szymanski LZ77 variant) — Okumura’s reference layout.

lzwlzw

Lempel–Ziv–Welch — the Unix compress(1) (.Z) flavour.

lzxamiga_lzx or lzx

LZX (Microsoft CAB / WIM compression).

mtfmtf

Move-To-Front (MTF) transform — a reversible, length-preserving filter.

packbitspackbits

PackBits — Apple’s tag-byte RLE used in TIFF, PSD, BMP, and macOS metadata.

ppmdppmd

PPMd — Dmitry Shkarin’s PPMII variant H, the format used by 7-Zip (method PPMd), RAR3+ (PPM block mode), and ZIP method 98.

qpackqpack

HTTP/3 QPACK header compression — RFC 9204.

quantumquantum

Quantum (Stac, used in older Microsoft CAB files) — decoder only.

rangecoderrangecoder

Adaptive order-0 binary range coder — a standalone entropy codec.

rar1rar1

RAR 1.x (1995-1996) — building-block library, no end-to-end decoder.

rar2rar2

RAR 2.x (1997-2002) — reverse-engineered — decoder-only.

rar3rar3

RAR 3.x (2002-2013) — LZ77 + Huffman path — decoder only.

rar5rar5

RAR 5.x (2013-present) — LZ77/Huffman + new filters — decoder only.

rlerle

Run-length encoding.

rle90rle90

RLE90 — the 0x90/DLE run-length variant shared by ARC method 3 (“packed”) and classic StuffIt method 1.

sit13sit13

StuffIt classic compression method 13 (“LZ+Huffman”).

snappysnappy

Google Snappy — raw block format.

tokio_iotokio

Async tokio::io::AsyncRead / AsyncWrite adapters.

vecalloc

One-shot Vec<u8> compress / decompress helpers.

xpressxpress

Microsoft Xpress — Plain LZ77 byte-aligned codec.

xpress_huffmanxpress_huffman

XPress Huffman ([MS-XCA] §2.1) — Microsoft’s LZ77 + canonical Huffman.

xzxz

xz container around LZMA2.

zip_implodezip_implode

PKZIP Implode (ZIP method 6) — decoder only.

zip_reducezip_reduce

PKZip Reduce (methods 2–5) — decoder only.

zip_shrinkzip_shrink

ZIP method 1 — Shrink: dynamic LZW with a partial-clear marker.

zlibzlib

RFC 1950 zlib container around RFC 1951 deflate.

zstdzstd

Zstandard (RFC 8478) — partial implementation.

Structs

Progress

Bytes consumed from input and written to output by one codec call.

Enums

Error

Errors that any algorithm in this crate may return.

Flush

How aggressively Encoder::flush should drain pending encoder state.

Status

Why a codec call returned — the explicit “what should I do next?” signal.

Traits

Algorithm

A compression algorithm: a name plus encoder/decoder factories plus per-algorithm configuration types.

Decoder

A streaming decompressor.

Encoder

A streaming compressor.