compress revision 186690
1251607Sdim 2251607Sdim#------------------------------------------------------------------------------ 3251607Sdim# compress: file(1) magic for pure-compression formats (no archives) 4251607Sdim# 5251607Sdim# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc. 6251607Sdim# 7251607Sdim# Formats for various forms of compressed data 8251607Sdim# Formats for "compress" proper have been moved into "compress.c", 9251607Sdim# because it tries to uncompress it to figure out what's inside. 10251607Sdim 11251607Sdim# standard unix compress 12251607Sdim0 string \037\235 compress'd data 13251607Sdim!:mime application/x-compress 14251607Sdim>2 byte&0x80 >0 block compressed 15251607Sdim>2 byte&0x1f x %d bits 16251607Sdim 17251607Sdim# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver) 18251607Sdim# Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002 19251607Sdim# * Original filename is only at offset 10 if "extra field" absent 20251607Sdim# * Produce shorter output - notably, only report compression methods 21251607Sdim# other than 8 ("deflate", the only method defined in RFC 1952). 22251607Sdim0 string \037\213 gzip compressed data 23251607Sdim!:mime application/x-gzip 24263508Sdim>2 byte <8 \b, reserved method 25263508Sdim>2 byte >8 \b, unknown method 26263508Sdim>3 byte &0x01 \b, ASCII 27263508Sdim>3 byte &0x02 \b, has CRC 28263508Sdim>3 byte &0x04 \b, extra field 29263508Sdim>3 byte&0xC =0x08 30251607Sdim>>10 string x \b, was "%s" 31263508Sdim>3 byte &0x10 \b, has comment 32263508Sdim>9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT) 33263508Sdim>9 byte =0x01 \b, from Amiga 34263508Sdim>9 byte =0x02 \b, from VMS 35263508Sdim>9 byte =0x03 \b, from Unix 36251607Sdim>9 byte =0x04 \b, from VM/CMS 37263508Sdim>9 byte =0x05 \b, from Atari 38263508Sdim>9 byte =0x06 \b, from HPFS filesystem (OS/2, NT) 39263508Sdim>9 byte =0x07 \b, from MacOS 40263508Sdim>9 byte =0x08 \b, from Z-System 41263508Sdim>9 byte =0x09 \b, from CP/M 42263508Sdim>9 byte =0x0A \b, from TOPS/20 43251607Sdim>9 byte =0x0B \b, from NTFS filesystem (NT) 44251607Sdim>9 byte =0x0C \b, from QDOS 45251607Sdim>9 byte =0x0D \b, from Acorn RISCOS 46251607Sdim>3 byte &0x10 \b, comment 47251607Sdim>3 byte &0x20 \b, encrypted 48251607Sdim>4 ledate >0 \b, last modified: %s 49251607Sdim>8 byte 2 \b, max compression 50251607Sdim>8 byte 4 \b, max speed 51251607Sdim 52251607Sdim# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis 53251607Sdim0 string \037\036 packed data 54251607Sdim!:mime application/octet-stream 55251607Sdim>2 belong >1 \b, %d characters originally 56251607Sdim>2 belong =1 \b, %d character originally 57251607Sdim# 58251607Sdim# This magic number is byte-order-independent. 59251607Sdim0 short 0x1f1f old packed data 60251607Sdim!:mime application/octet-stream 61263508Sdim 62263508Sdim# XXX - why *two* entries for "compacted data", one of which is 63263508Sdim# byte-order independent, and one of which is byte-order dependent? 64263508Sdim# 65263508Sdim0 short 0x1fff compacted data 66263508Sdim!:mime application/octet-stream 67263508Sdim# This string is valid for SunOS (BE) and a matching "short" is listed 68263508Sdim# in the Ultrix (LE) magic file. 69263508Sdim0 string \377\037 compacted data 70263508Sdim!:mime application/octet-stream 71263508Sdim0 short 0145405 huf output 72263508Sdim!:mime application/octet-stream 73263508Sdim 74263508Sdim# bzip2 75263508Sdim0 string BZh bzip2 compressed data 76263508Sdim!:mime application/x-bzip2 77263508Sdim>3 byte >47 \b, block size = %c00k 78263508Sdim 79263508Sdim# squeeze and crunch 80263508Sdim# Michael Haardt <michael@cantor.informatik.rwth-aachen.de> 81263508Sdim0 beshort 0x76FF squeezed data, 82263508Sdim>4 string x original name %s 83263508Sdim0 beshort 0x76FE crunched data, 84263508Sdim>2 string x original name %s 85263508Sdim0 beshort 0x76FD LZH compressed data, 86263508Sdim>2 string x original name %s 87263508Sdim 88263508Sdim# Freeze 89263508Sdim0 string \037\237 frozen file 2.1 90263508Sdim0 string \037\236 frozen file 1.0 (or gzip 0.5) 91263508Sdim 92263508Sdim# SCO compress -H (LZH) 93263508Sdim0 string \037\240 SCO compress -H (LZH) data 94263508Sdim 95251607Sdim# European GSM 06.10 is a provisional standard for full-rate speech 96251607Sdim# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse 97251607Sdim# excitation/long term prediction) coding at 13 kbit/s. 98251607Sdim# 99251607Sdim# There's only a magic nibble (4 bits); that nibble repeats every 33 100251607Sdim# bytes. This isn't suited for use, but maybe we can use it someday. 101251607Sdim# 102251607Sdim# This will cause very short GSM files to be declared as data and 103251607Sdim# mismatches to be declared as data too! 104251607Sdim#0 byte&0xF0 0xd0 data 105263508Sdim#>33 byte&0xF0 0xd0 106263508Sdim#>66 byte&0xF0 0xd0 107251607Sdim#>99 byte&0xF0 0xd0 108251607Sdim#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio 109251607Sdim 110251607Sdim# bzip a block-sorting file compressor 111251607Sdim# by Julian Seward <sewardj@cs.man.ac.uk> and others 112251607Sdim# 113251607Sdim#0 string BZ bzip compressed data 114263508Sdim#>2 byte x \b, version: %c 115263508Sdim#>3 string =1 \b, compression block size 100k 116251607Sdim#>3 string =2 \b, compression block size 200k 117251607Sdim#>3 string =3 \b, compression block size 300k 118251607Sdim#>3 string =4 \b, compression block size 400k 119251607Sdim#>3 string =5 \b, compression block size 500k 120263508Sdim#>3 string =6 \b, compression block size 600k 121263508Sdim#>3 string =7 \b, compression block size 700k 122263508Sdim#>3 string =8 \b, compression block size 800k 123263508Sdim#>3 string =9 \b, compression block size 900k 124263508Sdim 125263508Sdim# lzop from <markus.oberhumer@jk.uni-linz.ac.at> 126263508Sdim0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data 127263508Sdim>9 beshort <0x0940 128263508Sdim>>9 byte&0xf0 =0x00 - version 0. 129263508Sdim>>9 beshort&0x0fff x \b%03x, 130263508Sdim>>13 byte 1 LZO1X-1, 131263508Sdim>>13 byte 2 LZO1X-1(15), 132263508Sdim>>13 byte 3 LZO1X-999, 133263508Sdim## >>22 bedate >0 last modified: %s, 134263508Sdim>>14 byte =0x00 os: MS-DOS 135263508Sdim>>14 byte =0x01 os: Amiga 136263508Sdim>>14 byte =0x02 os: VMS 137263508Sdim>>14 byte =0x03 os: Unix 138251607Sdim>>14 byte =0x05 os: Atari 139251607Sdim>>14 byte =0x06 os: OS/2 140251607Sdim>>14 byte =0x07 os: MacOS 141251607Sdim>>14 byte =0x0A os: Tops/20 142251607Sdim>>14 byte =0x0B os: WinNT 143251607Sdim>>14 byte =0x0E os: Win32 144263508Sdim>9 beshort >0x0939 145263508Sdim>>9 byte&0xf0 =0x00 - version 0. 146263508Sdim>>9 byte&0xf0 =0x10 - version 1. 147263508Sdim>>9 byte&0xf0 =0x20 - version 2. 148263508Sdim>>9 beshort&0x0fff x \b%03x, 149263508Sdim>>15 byte 1 LZO1X-1, 150263508Sdim>>15 byte 2 LZO1X-1(15), 151251607Sdim>>15 byte 3 LZO1X-999, 152263508Sdim## >>25 bedate >0 last modified: %s, 153263508Sdim>>17 byte =0x00 os: MS-DOS 154263508Sdim>>17 byte =0x01 os: Amiga 155251607Sdim>>17 byte =0x02 os: VMS 156251607Sdim>>17 byte =0x03 os: Unix 157251607Sdim>>17 byte =0x05 os: Atari 158251607Sdim>>17 byte =0x06 os: OS/2 159251607Sdim>>17 byte =0x07 os: MacOS 160251607Sdim>>17 byte =0x0A os: Tops/20 161263508Sdim>>17 byte =0x0B os: WinNT 162251607Sdim>>17 byte =0x0E os: Win32 163251607Sdim 164251607Sdim# 4.3BSD-Quasijarus Strong Compression 165251607Sdim# http://minnie.tuhs.org/Quasijarus/compress.html 166251607Sdim0 string \037\241 Quasijarus strong compressed data 167251607Sdim 168251607Sdim# From: Cory Dikkers <cdikkers@swbell.net> 169251607Sdim0 string XPKF Amiga xpkf.library compressed data 170251607Sdim0 string PP11 Power Packer 1.1 compressed data 171251607Sdim0 string PP20 Power Packer 2.0 compressed data, 172263508Sdim>4 belong 0x09090909 fast compression 173263508Sdim>4 belong 0x090A0A0A mediocre compression 174263508Sdim>4 belong 0x090A0B0B good compression 175263508Sdim>4 belong 0x090A0C0C very good compression 176263508Sdim>4 belong 0x090A0C0D best compression 177263508Sdim 178263508Sdim# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at) 179263508Sdim# http://www.7-zip.org or DOC/7zFormat.txt 180263508Sdim# 181263508Sdim0 string 7z\274\257\047\034 7-zip archive data, 182263508Sdim>6 byte x version %d 183263508Sdim>7 byte x \b.%d 184263508Sdim 185263508Sdim# Type: LZMA 186263508Sdim# URL: http://www.7-zip.org/sdk.html 187263508Sdim# From: Robert Millan <rmh@aybabtu.com> and Reuben Thomas <rrt@sc3d.org> 188263508Sdim# Commented out because apparently not reliable (according to Debian 189263508Sdim# bug #364260) 190263508Sdim#0 string ]\000\000\200\000 LZMA compressed data 191263508Sdim 192263508Sdim# AFX compressed files (Wolfram Kleff) 193263508Sdim2 string -afx- AFX compressed file data 194263508Sdim 195263508Sdim# Supplementary magic data for the file(1) command to support 196263508Sdim# rzip(1). The format is described in magic(5). 197263508Sdim# 198263508Sdim# Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with 199263508Sdim# this file. 200263508Sdim# 201263508Sdim0 string RZIP rzip compressed data 202263508Sdim>4 byte x - version %d 203263508Sdim>5 byte x \b.%d 204263508Sdim>6 belong x (%d bytes) 205263508Sdim