317 lines
10 KiB
Plaintext
317 lines
10 KiB
Plaintext
#------------------------------------------------------------------------------
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# $File: compress,v 1.66 2016/09/16 12:12:05 christos Exp $
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# compress: file(1) magic for pure-compression formats (no archives)
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#
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# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc.
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#
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# Formats for various forms of compressed data
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# Formats for "compress" proper have been moved into "compress.c",
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# because it tries to uncompress it to figure out what's inside.
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# standard unix compress
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0 string \037\235 compress'd data
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!:mime application/x-compress
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!:apple LZIVZIVU
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>2 byte&0x80 >0 block compressed
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>2 byte&0x1f x %d bits
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# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver)
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# Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002
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# * Original filename is only at offset 10 if "extra field" absent
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# * Produce shorter output - notably, only report compression methods
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# other than 8 ("deflate", the only method defined in RFC 1952).
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0 string \037\213 gzip compressed data
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!:mime application/x-gzip
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!:strength * 2
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>2 byte <8 \b, reserved method
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>2 byte >8 \b, unknown method
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>3 byte &0x01 \b, ASCII
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>3 byte &0x02 \b, has CRC
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>3 byte &0x04 \b, extra field
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>3 byte&0xC =0x08
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>>10 string x \b, was "%s"
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>3 byte &0x10 \b, has comment
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>3 byte &0x20 \b, encrypted
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>4 ledate >0 \b, last modified: %s
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>8 byte 2 \b, max compression
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>8 byte 4 \b, max speed
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>9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT)
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>9 byte =0x01 \b, from Amiga
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>9 byte =0x02 \b, from VMS
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>9 byte =0x03 \b, from Unix
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>9 byte =0x04 \b, from VM/CMS
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>9 byte =0x05 \b, from Atari
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>9 byte =0x06 \b, from HPFS filesystem (OS/2, NT)
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>9 byte =0x07 \b, from MacOS
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>9 byte =0x08 \b, from Z-System
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>9 byte =0x09 \b, from CP/M
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>9 byte =0x0A \b, from TOPS/20
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>9 byte =0x0B \b, from NTFS filesystem (NT)
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>9 byte =0x0C \b, from QDOS
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>9 byte =0x0D \b, from Acorn RISCOS
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# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
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0 string \037\036 packed data
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!:mime application/octet-stream
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>2 belong >1 \b, %d characters originally
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>2 belong =1 \b, %d character originally
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#
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# This magic number is byte-order-independent.
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0 short 0x1f1f old packed data
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!:mime application/octet-stream
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# XXX - why *two* entries for "compacted data", one of which is
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# byte-order independent, and one of which is byte-order dependent?
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#
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0 short 0x1fff compacted data
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!:mime application/octet-stream
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# This string is valid for SunOS (BE) and a matching "short" is listed
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# in the Ultrix (LE) magic file.
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0 string \377\037 compacted data
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!:mime application/octet-stream
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0 short 0145405 huf output
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!:mime application/octet-stream
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# bzip2
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0 string BZh bzip2 compressed data
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!:mime application/x-bzip2
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>3 byte >47 \b, block size = %c00k
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# lzip
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0 string LZIP lzip compressed data
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!:mime application/x-lzip
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>4 byte x \b, version: %d
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# squeeze and crunch
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# Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
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0 beshort 0x76FF squeezed data,
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>4 string x original name %s
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0 beshort 0x76FE crunched data,
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>2 string x original name %s
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0 beshort 0x76FD LZH compressed data,
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>2 string x original name %s
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# Freeze
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0 string \037\237 frozen file 2.1
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0 string \037\236 frozen file 1.0 (or gzip 0.5)
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# SCO compress -H (LZH)
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0 string \037\240 SCO compress -H (LZH) data
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# European GSM 06.10 is a provisional standard for full-rate speech
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# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
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# excitation/long term prediction) coding at 13 kbit/s.
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#
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# There's only a magic nibble (4 bits); that nibble repeats every 33
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# bytes. This isn't suited for use, but maybe we can use it someday.
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#
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# This will cause very short GSM files to be declared as data and
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# mismatches to be declared as data too!
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#0 byte&0xF0 0xd0 data
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#>33 byte&0xF0 0xd0
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#>66 byte&0xF0 0xd0
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#>99 byte&0xF0 0xd0
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#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio
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# bzip a block-sorting file compressor
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# by Julian Seward <sewardj@cs.man.ac.uk> and others
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#
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#0 string BZ bzip compressed data
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#>2 byte x \b, version: %c
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#>3 string =1 \b, compression block size 100k
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#>3 string =2 \b, compression block size 200k
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#>3 string =3 \b, compression block size 300k
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#>3 string =4 \b, compression block size 400k
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#>3 string =5 \b, compression block size 500k
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#>3 string =6 \b, compression block size 600k
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#>3 string =7 \b, compression block size 700k
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#>3 string =8 \b, compression block size 800k
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#>3 string =9 \b, compression block size 900k
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# lzop from <markus.oberhumer@jk.uni-linz.ac.at>
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0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data
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>9 beshort <0x0940
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>>9 byte&0xf0 =0x00 - version 0.
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>>9 beshort&0x0fff x \b%03x,
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>>13 byte 1 LZO1X-1,
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>>13 byte 2 LZO1X-1(15),
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>>13 byte 3 LZO1X-999,
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## >>22 bedate >0 last modified: %s,
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>>14 byte =0x00 os: MS-DOS
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>>14 byte =0x01 os: Amiga
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>>14 byte =0x02 os: VMS
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>>14 byte =0x03 os: Unix
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>>14 byte =0x05 os: Atari
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>>14 byte =0x06 os: OS/2
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>>14 byte =0x07 os: MacOS
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>>14 byte =0x0A os: Tops/20
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>>14 byte =0x0B os: WinNT
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>>14 byte =0x0E os: Win32
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>9 beshort >0x0939
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>>9 byte&0xf0 =0x00 - version 0.
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>>9 byte&0xf0 =0x10 - version 1.
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>>9 byte&0xf0 =0x20 - version 2.
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>>9 beshort&0x0fff x \b%03x,
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>>15 byte 1 LZO1X-1,
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>>15 byte 2 LZO1X-1(15),
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>>15 byte 3 LZO1X-999,
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## >>25 bedate >0 last modified: %s,
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>>17 byte =0x00 os: MS-DOS
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>>17 byte =0x01 os: Amiga
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>>17 byte =0x02 os: VMS
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>>17 byte =0x03 os: Unix
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>>17 byte =0x05 os: Atari
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>>17 byte =0x06 os: OS/2
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>>17 byte =0x07 os: MacOS
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>>17 byte =0x0A os: Tops/20
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>>17 byte =0x0B os: WinNT
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>>17 byte =0x0E os: Win32
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# 4.3BSD-Quasijarus Strong Compression
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# http://minnie.tuhs.org/Quasijarus/compress.html
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0 string \037\241 Quasijarus strong compressed data
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# From: Cory Dikkers <cdikkers@swbell.net>
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0 string XPKF Amiga xpkf.library compressed data
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0 string PP11 Power Packer 1.1 compressed data
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0 string PP20 Power Packer 2.0 compressed data,
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>4 belong 0x09090909 fast compression
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>4 belong 0x090A0A0A mediocre compression
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>4 belong 0x090A0B0B good compression
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>4 belong 0x090A0C0C very good compression
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>4 belong 0x090A0C0D best compression
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# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
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# http://www.7-zip.org or DOC/7zFormat.txt
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#
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0 string 7z\274\257\047\034 7-zip archive data,
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>6 byte x version %d
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>7 byte x \b.%d
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!:mime application/x-7z-compressed
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!:ext 7z/cb7
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# Type: LZMA
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0 lelong&0xffffff =0x5d
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>12 leshort 0xff LZMA compressed data,
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!:mime application/x-lzma
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>>5 lequad =0xffffffffffffffff streamed
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>>5 lequad !0xffffffffffffffff non-streamed, size %lld
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>12 leshort 0 LZMA compressed data,
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>>5 lequad =0xffffffffffffffff streamed
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>>5 lequad !0xffffffffffffffff non-streamed, size %lld
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# http://tukaani.org/xz/xz-file-format.txt
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0 ustring \xFD7zXZ\x00 XZ compressed data
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!:strength * 2
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!:mime application/x-xz
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# https://github.com/ckolivas/lrzip/blob/master/doc/magic.header.txt
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0 string LRZI LRZIP compressed data
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>4 byte x - version %d
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>5 byte x \b.%d
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!:mime application/x-lrzip
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# http://fastcompression.blogspot.fi/2013/04/lz4-streaming-format-final.html
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0 lelong 0x184d2204 LZ4 compressed data (v1.4+)
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!:mime application/x-lz4
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# Added by osm0sis@xda-developers.com
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0 lelong 0x184c2103 LZ4 compressed data (v1.0-v1.3)
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!:mime application/x-lz4
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0 lelong 0x184c2102 LZ4 compressed data (v0.1-v0.9)
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!:mime application/x-lz4
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# Zstandard/LZ4 skippable frames
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# https://github.com/facebook/zstd/blob/dev/zstd_compression_format.md
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0 lelong&0xFFFFFFF0 0x184D2A50
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>(4.l+8) indirect
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# Zstandard Dictionary ID subroutine
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0 name zstd-dictionary-id
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# Single Segment = True
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>0 byte &0x20 \b, Dictionary ID:
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>>0 byte&0x03 0 None
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>>0 byte&0x03 1
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>>>1 byte x %u
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>>0 byte&0x03 2
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>>>1 leshort x %u
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>>0 byte&0x03 3
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>>>1 lelong x %u
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# Single Segment = False
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>0 byte ^0x20 \b, Dictionary ID:
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>>0 byte&0x03 0 None
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>>0 byte&0x03 1
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>>>2 byte x %u
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>>0 byte&0x03 2
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>>>2 leshort x %u
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>>0 byte&0x03 3
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>>>2 lelong x %u
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# Zstandard compressed data
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# https://github.com/facebook/zstd/blob/dev/zstd_compression_format.md
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0 lelong 0xFD2FB522 Zstandard compressed data (v0.2)
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!:mime application/x-zstd
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0 lelong 0xFD2FB523 Zstandard compressed data (v0.3)
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!:mime application/x-zstd
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0 lelong 0xFD2FB524 Zstandard compressed data (v0.4)
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!:mime application/x-zstd
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0 lelong 0xFD2FB525 Zstandard compressed data (v0.5)
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!:mime application/x-zstd
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0 lelong 0xFD2FB526 Zstandard compressed data (v0.6)
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!:mime application/x-zstd
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0 lelong 0xFD2FB527 Zstandard compressed data (v0.7)
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!:mime application/x-zstd
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>4 use zstd-dictionary-id
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0 lelong 0xFD2FB528 Zstandard compressed data (v0.8+)
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!:mime application/x-zstd
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>4 use zstd-dictionary-id
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# https://github.com/facebook/zstd/blob/dev/zstd_compression_format.md
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0 lelong 0xEC30A437 Zstandard dictionary
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!:mime application/x-zstd-dictionary
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>4 lelong x (ID %u)
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# AFX compressed files (Wolfram Kleff)
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2 string -afx- AFX compressed file data
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# Supplementary magic data for the file(1) command to support
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# rzip(1). The format is described in magic(5).
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#
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# Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with
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# this file.
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#
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0 string RZIP rzip compressed data
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>4 byte x - version %d
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>5 byte x \b.%d
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>6 belong x (%d bytes)
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0 string ArC\x01 FreeArc archive <http://freearc.org>
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# Type: DACT compressed files
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0 long 0x444354C3 DACT compressed data
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>4 byte >-1 (version %i.
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>5 byte >-1 %i.
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>6 byte >-1 %i)
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>7 long >0 , original size: %i bytes
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>15 long >30 , block size: %i bytes
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# Valve Pack (VPK) files
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0 lelong 0x55aa1234 Valve Pak file
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>0x4 lelong x \b, version %u
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>0x8 lelong x \b, %u entries
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# Snappy framing format
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# http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
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0 string \377\006\0\0sNaPpY snappy framed data
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!:mime application/x-snappy-framed
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# qpress, http://www.quicklz.com/
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0 string qpress10 qpress compressed data
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!:mime application/x-qpress
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# Zlib https://www.ietf.org/rfc/rfc6713.txt
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0 string/b x
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>0 beshort%31 =0
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>>0 byte&0xf =8
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>>>0 byte&0x80 =0 zlib compressed data
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!:mime application/zlib
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