Compression
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Revision as of 14:35, 26 May 2020
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
- Crunchmania
- DEFLATE
- DivANS
- Huffman coding
- LZ4
- LZ77
- LZ78
- LZFSE
- LZHAM
- LZMA
- LZMA2
- LZO (Lempel–Ziv–Oberhumer)
- LZSS (Lempel–Ziv–Storer–Szymanski)
- LZW
- MSZIP
- 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)
- 9CDR (Amiga FileImploder Clone)
- BARF (.x, .x??)
- BWTC32Key (.B3K)
- bzip (.bz)
- bzip2 (.bz2)
- compact (Unix) (.C)
- compress (Unix) (.Z)
- CrLZH (.?y?)
- CRN (.crn) - compressed text files used for PC-Write manual
- Crunch (.?z?)
- DUPA (Amiga FileImploder Clone)
- Error Code Modeler (.ecm)
- File Imploder (Amiga) (.imp)
- Freeze/Melt (Unix) (.F)
- gzip (.gz)
- Hammer
- ICE (.ice, by Michael Lamanuzzi)
- Inflate (.infl) - parody format that actually increases size
- JAM (W. Jiang)
- 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 (Unix) (.z)
- PowerPacker (.pp)
- Pro-Pack
- RAC
- RK (WinRK)
- rzip (.rz)
- SCO compress LZH
- SHARC (density)
- Softdisk Text Compressor (.ctx)
- Squash - single file compression on RISC OS
- Squeeze/SQ (.?q?)
- TTComp archive
- TTW
- tzip
- Tzip (Text ZIP)
- WWPACK
- XPK
- XZ (.xz)
- Yaz0
Transparent file compression
(A mostly-obsolete technique in which a background process hooks into the OS and decompresses files transparently when they are read. Compression might be done manually. The line between this and Disk compression can be blurry.)
Disk compression
(Transparent disk compression software and the like, excluding filesystem formats.)
- DiskDoubler
- DriveSpace and DoubleSpace
- JAM (disk compression)
- Stacker
For filesystem formats that feature compression, see Filesystem.
Executable compression
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)
