Compression
From Just Solve the File Format Problem
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* [[Shannon–Fano coding]] | * [[Shannon–Fano coding]] | ||
* [[Snappy]] (Google-created compression also used by Apple in iWork formats) | * [[Snappy]] (Google-created compression also used by Apple in iWork formats) | ||
Revision as of 17:30, 4 September 2019
Contents |
Stream compression formats
A stream format takes a stream of bytes, and outputs a different, hopefully smaller, stream of bytes. These compression formats are often used internally in other data structures to compress data, as well as in network protocols, such as http. Used stand-alone, a stream compression format does not offer archiving capability, however in the UNIX doctrine, an archiver like tar can be combined with an archive format to produce a proper compressed archive.
Compression algorithms and compressed data formats
(excluding formats usually used as file formats)
- Arithmetic coding
- Brotli
- Burrows–Wheeler transform
- DEFLATE
- DivANS
- Huffman coding
- LZ4
- LZ77
- LZ78
- LZFSE
- LZHAM
- LZMA
- LZMA2
- LZO (Lempel–Ziv–Oberhumer)
- LZSS (Lempel–Ziv–Storer–Szymanski)
- LZW
- PKWARE DCL Implode
- PPMd
- Run-length encoding
- Shannon–Fano coding
- Snappy (Google-created compression also used by Apple in iWork formats)
- zlib
- Zstandard (Zstd)
Graphics compression
See Graphics#Compression for compression formats used primarily with graphics.
Specific file formats/programs
(multi-file compressors are in Archiving)
- 7z
- 9CDR (Amiga FileImploder Clone)
- BARF (.x, .x??)
- bzip (.bz)
- bzip2 (.bz2)
- compress (.Z)
- CrLZH (.?y?)
- CRN (.crn) - compressed text files used for PC-Write manual
- Crunch (.?z?)
- DiskDoubler
- DUPA (Amiga FileImploder Clone)
- Error Code Modeler (.ecm)
- File Imploder (Amiga) (.imp)
- Freeze/Melt (Unix) (.F)
- gzip (.gz)
- Hammer
- Inflate (.infl) - parody format that actually increases size
- JCalG1 (.jc, Commodore Amiga)
- lrzip (.lrz)
- Lzip (.lz)
- LZMA_Alone (.lzma)
- lzop (.lzo)
- LZX
- Mozilla LZ4 (.jsonlz4)
- MS-DOS installation compression (.??_)
- Oodle Data Compression
- pack (.z)
- Pack-Ice
- PowerPacker (.pp)
- Pro-Pack
- RK (WinRK)
- rzip (.rz)
- SHARC (density)
- Softdisk Text Compressor (.ctx)
- Squash - single file compression on RISC OS
- Squeeze/SQ (.?q?)
- TTComp archive
- tzip
- Tzip (Text ZIP)
- XZ (.xz)
- Yaz0
See also
- Compression research
- Archiving (for formats that place multiple files together in one file, with or without compression)
- Graphics (for image-specific compression)
- Video (for video-specific compression)
- Audio and Music (for audio-specific compression)
- Executables (for executable-specific compression)
