1 2#------------------------------------------------------------------------------ 3# $File: compress,v 1.42 2009/09/19 16:28:08 christos Exp $ 4# compress: file(1) magic for pure-compression formats (no archives) 5# 6# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc. 7# 8# Formats for various forms of compressed data 9# Formats for "compress" proper have been moved into "compress.c", 10# because it tries to uncompress it to figure out what's inside. 11 12# standard unix compress 130 string \037\235 compress'd data 14!:mime application/x-compress 15!:apple LZIVZIVU 16>2 byte&0x80 >0 block compressed 17>2 byte&0x1f x %d bits 18 19# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver) 20# Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002 21# * Original filename is only at offset 10 if "extra field" absent 22# * Produce shorter output - notably, only report compression methods 23# other than 8 ("deflate", the only method defined in RFC 1952). 240 string \037\213 gzip compressed data 25!:mime application/x-gzip 26>2 byte <8 \b, reserved method 27>2 byte >8 \b, unknown method 28>3 byte &0x01 \b, ASCII 29>3 byte &0x02 \b, has CRC 30>3 byte &0x04 \b, extra field 31>3 byte&0xC =0x08 32>>10 string x \b, was "%s" 33>3 byte &0x10 \b, has comment 34>9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT) 35>9 byte =0x01 \b, from Amiga 36>9 byte =0x02 \b, from VMS 37>9 byte =0x03 \b, from Unix 38>9 byte =0x04 \b, from VM/CMS 39>9 byte =0x05 \b, from Atari 40>9 byte =0x06 \b, from HPFS filesystem (OS/2, NT) 41>9 byte =0x07 \b, from MacOS 42>9 byte =0x08 \b, from Z-System 43>9 byte =0x09 \b, from CP/M 44>9 byte =0x0A \b, from TOPS/20 45>9 byte =0x0B \b, from NTFS filesystem (NT) 46>9 byte =0x0C \b, from QDOS 47>9 byte =0x0D \b, from Acorn RISCOS 48>3 byte &0x10 \b, comment 49>3 byte &0x20 \b, encrypted 50>4 ledate >0 \b, last modified: %s 51>8 byte 2 \b, max compression 52>8 byte 4 \b, max speed 53 54# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis 550 string \037\036 packed data 56!:mime application/octet-stream 57>2 belong >1 \b, %d characters originally 58>2 belong =1 \b, %d character originally 59# 60# This magic number is byte-order-independent. 610 short 0x1f1f old packed data 62!:mime application/octet-stream 63 64# XXX - why *two* entries for "compacted data", one of which is 65# byte-order independent, and one of which is byte-order dependent? 66# 670 short 0x1fff compacted data 68!:mime application/octet-stream 69# This string is valid for SunOS (BE) and a matching "short" is listed 70# in the Ultrix (LE) magic file. 710 string \377\037 compacted data 72!:mime application/octet-stream 730 short 0145405 huf output 74!:mime application/octet-stream 75 76# bzip2 770 string BZh bzip2 compressed data 78!:mime application/x-bzip2 79>3 byte >47 \b, block size = %c00k 80 81# lzip 820 string LZIP lzip compressed data 83!:mime application/x-lzip 84>4 byte x \b, version: %d 85 86# squeeze and crunch 87# Michael Haardt <michael@cantor.informatik.rwth-aachen.de> 880 beshort 0x76FF squeezed data, 89>4 string x original name %s 900 beshort 0x76FE crunched data, 91>2 string x original name %s 920 beshort 0x76FD LZH compressed data, 93>2 string x original name %s 94 95# Freeze 960 string \037\237 frozen file 2.1 970 string \037\236 frozen file 1.0 (or gzip 0.5) 98 99# SCO compress -H (LZH) 1000 string \037\240 SCO compress -H (LZH) data 101 102# European GSM 06.10 is a provisional standard for full-rate speech 103# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse 104# excitation/long term prediction) coding at 13 kbit/s. 105# 106# There's only a magic nibble (4 bits); that nibble repeats every 33 107# bytes. This isn't suited for use, but maybe we can use it someday. 108# 109# This will cause very short GSM files to be declared as data and 110# mismatches to be declared as data too! 111#0 byte&0xF0 0xd0 data 112#>33 byte&0xF0 0xd0 113#>66 byte&0xF0 0xd0 114#>99 byte&0xF0 0xd0 115#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio 116 117# bzip a block-sorting file compressor 118# by Julian Seward <sewardj@cs.man.ac.uk> and others 119# 120#0 string BZ bzip compressed data 121#>2 byte x \b, version: %c 122#>3 string =1 \b, compression block size 100k 123#>3 string =2 \b, compression block size 200k 124#>3 string =3 \b, compression block size 300k 125#>3 string =4 \b, compression block size 400k 126#>3 string =5 \b, compression block size 500k 127#>3 string =6 \b, compression block size 600k 128#>3 string =7 \b, compression block size 700k 129#>3 string =8 \b, compression block size 800k 130#>3 string =9 \b, compression block size 900k 131 132# lzop from <markus.oberhumer@jk.uni-linz.ac.at> 1330 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data 134>9 beshort <0x0940 135>>9 byte&0xf0 =0x00 - version 0. 136>>9 beshort&0x0fff x \b%03x, 137>>13 byte 1 LZO1X-1, 138>>13 byte 2 LZO1X-1(15), 139>>13 byte 3 LZO1X-999, 140## >>22 bedate >0 last modified: %s, 141>>14 byte =0x00 os: MS-DOS 142>>14 byte =0x01 os: Amiga 143>>14 byte =0x02 os: VMS 144>>14 byte =0x03 os: Unix 145>>14 byte =0x05 os: Atari 146>>14 byte =0x06 os: OS/2 147>>14 byte =0x07 os: MacOS 148>>14 byte =0x0A os: Tops/20 149>>14 byte =0x0B os: WinNT 150>>14 byte =0x0E os: Win32 151>9 beshort >0x0939 152>>9 byte&0xf0 =0x00 - version 0. 153>>9 byte&0xf0 =0x10 - version 1. 154>>9 byte&0xf0 =0x20 - version 2. 155>>9 beshort&0x0fff x \b%03x, 156>>15 byte 1 LZO1X-1, 157>>15 byte 2 LZO1X-1(15), 158>>15 byte 3 LZO1X-999, 159## >>25 bedate >0 last modified: %s, 160>>17 byte =0x00 os: MS-DOS 161>>17 byte =0x01 os: Amiga 162>>17 byte =0x02 os: VMS 163>>17 byte =0x03 os: Unix 164>>17 byte =0x05 os: Atari 165>>17 byte =0x06 os: OS/2 166>>17 byte =0x07 os: MacOS 167>>17 byte =0x0A os: Tops/20 168>>17 byte =0x0B os: WinNT 169>>17 byte =0x0E os: Win32 170 171# 4.3BSD-Quasijarus Strong Compression 172# http://minnie.tuhs.org/Quasijarus/compress.html 1730 string \037\241 Quasijarus strong compressed data 174 175# From: Cory Dikkers <cdikkers@swbell.net> 1760 string XPKF Amiga xpkf.library compressed data 1770 string PP11 Power Packer 1.1 compressed data 1780 string PP20 Power Packer 2.0 compressed data, 179>4 belong 0x09090909 fast compression 180>4 belong 0x090A0A0A mediocre compression 181>4 belong 0x090A0B0B good compression 182>4 belong 0x090A0C0C very good compression 183>4 belong 0x090A0C0D best compression 184 185# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at) 186# http://www.7-zip.org or DOC/7zFormat.txt 187# 1880 string 7z\274\257\047\034 7-zip archive data, 189>6 byte x version %d 190>7 byte x \b.%d 191 192# Type: LZMA 193# URL: http://www.7-zip.org/sdk.html 194# From: Robert Millan <rmh@aybabtu.com> and Reuben Thomas <rrt@sc3d.org> 195# Commented out because apparently not reliable (according to Debian 196# bug #364260) 197#0 string ]\000\000\200\000 LZMA compressed data 198 199# http://tukaani.org/xz/xz-file-format.txt 2000 ustring \xFD7zXZ\x00 xz compressed data 201!:mime application/x-xz 202 203# AFX compressed files (Wolfram Kleff) 2042 string -afx- AFX compressed file data 205 206# Supplementary magic data for the file(1) command to support 207# rzip(1). The format is described in magic(5). 208# 209# Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with 210# this file. 211# 2120 string RZIP rzip compressed data 213>4 byte x - version %d 214>5 byte x \b.%d 215>6 belong x (%d bytes) 216 217# Type: XZ 218# URL: http://tukaani.org/xz/ 2190 string \xfd\x37\x7a\x58\x5a\x00 XZ compressed data 220!:mime application/x-xz 221