1# $OpenBSD: compress,v 1.6 2009/04/24 18:54:34 chl Exp $ 2 3#------------------------------------------------------------------------------ 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 13#0 string \037\235 compress'd data 14#!:mime application/x-compress 15>2 byte&0x80 >0 block compressed 16>2 byte&0x1f x %d bits 17 18# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver) 19# Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002 20# * Original filename is only at offset 10 if "extra field" absent 21# * Produce shorter output - notably, only report compression methods 22# other than 8 ("deflate", the only method defined in RFC 1952). 230 string \037\213 gzip compressed data 24!:mime application/x-gzip 25>2 byte <8 \b, reserved method 26>2 byte >8 \b, unknown method 27>3 byte &0x01 \b, ASCII 28>3 byte &0x02 \b, has CRC 29>3 byte &0x04 \b, extra field 30>3 byte&0xC =0x08 31>>10 string x \b, was "%s" 32>3 byte &0x10 \b, has comment 33>9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT) 34>9 byte =0x01 \b, from Amiga 35>9 byte =0x02 \b, from VMS 36>9 byte =0x03 \b, from Unix 37>9 byte =0x04 \b, from VM/CMS 38>9 byte =0x05 \b, from Atari 39>9 byte =0x06 \b, from HPFS filesystem (OS/2, NT) 40>9 byte =0x07 \b, from MacOS 41>9 byte =0x08 \b, from Z-System 42>9 byte =0x09 \b, from CP/M 43>9 byte =0x0A \b, from TOPS/20 44>9 byte =0x0B \b, from NTFS filesystem (NT) 45>9 byte =0x0C \b, from QDOS 46>9 byte =0x0D \b, from Acorn RISCOS 47>3 byte &0x10 \b, comment 48>3 byte &0x20 \b, encrypted 49>4 ledate >0 \b, last modified: %s 50>8 byte 2 \b, max compression 51>8 byte 4 \b, max speed 52 53# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis 540 string \037\036 packed data 55!:mime application/octet-stream 56>2 belong >1 \b, %d characters originally 57>2 belong =1 \b, %d character originally 58# 59# This magic number is byte-order-independent. 600 short 0x1f1f old packed data 61!:mime application/octet-stream 62 63# XXX - why *two* entries for "compacted data", one of which is 64# byte-order independent, and one of which is byte-order dependent? 65# 660 short 0x1fff compacted data 67!:mime application/octet-stream 68# This string is valid for SunOS (BE) and a matching "short" is listed 69# in the Ultrix (LE) magic file. 700 string \377\037 compacted data 71!:mime application/octet-stream 720 short 0145405 huf output 73!:mime application/octet-stream 74 75# bzip2 760 string BZh bzip2 compressed data 77!:mime application/x-bzip2 78>3 byte >47 \b, block size = %c00k 79 80# squeeze and crunch 81# Michael Haardt <michael@cantor.informatik.rwth-aachen.de> 820 beshort 0x76FF squeezed data, 83>4 string x original name %s 840 beshort 0x76FE crunched data, 85>2 string x original name %s 860 beshort 0x76FD LZH compressed data, 87>2 string x original name %s 88 89# Freeze 900 string \037\237 frozen file 2.1 910 string \037\236 frozen file 1.0 (or gzip 0.5) 92 93# SCO compress -H (LZH) 940 string \037\240 SCO compress -H (LZH) data 95 96# European GSM 06.10 is a provisional standard for full-rate speech 97# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse 98# excitation/long term prediction) coding at 13 kbit/s. 99# 100# There's only a magic nibble (4 bits); that nibble repeats every 33 101# bytes. This isn't suited for use, but maybe we can use it someday. 102# 103# This will cause very short GSM files to be declared as data and 104# mismatches to be declared as data too! 105#0 byte&0xF0 0xd0 data 106#>33 byte&0xF0 0xd0 107#>66 byte&0xF0 0xd0 108#>99 byte&0xF0 0xd0 109#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio 110 111# bzip a block-sorting file compressor 112# by Julian Seward <sewardj@cs.man.ac.uk> and others 113# 114#0 string BZ bzip compressed data 115#>2 byte x \b, version: %c 116#>3 string =1 \b, compression block size 100k 117#>3 string =2 \b, compression block size 200k 118#>3 string =3 \b, compression block size 300k 119#>3 string =4 \b, compression block size 400k 120#>3 string =5 \b, compression block size 500k 121#>3 string =6 \b, compression block size 600k 122#>3 string =7 \b, compression block size 700k 123#>3 string =8 \b, compression block size 800k 124#>3 string =9 \b, compression block size 900k 125 126# lzop from <markus.oberhumer@jk.uni-linz.ac.at> 1270 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data 128>9 beshort <0x0940 129>>9 byte&0xf0 =0x00 - version 0. 130>>9 beshort&0x0fff x \b%03x, 131>>13 byte 1 LZO1X-1, 132>>13 byte 2 LZO1X-1(15), 133>>13 byte 3 LZO1X-999, 134## >>22 bedate >0 last modified: %s, 135>>14 byte =0x00 os: MS-DOS 136>>14 byte =0x01 os: Amiga 137>>14 byte =0x02 os: VMS 138>>14 byte =0x03 os: Unix 139>>14 byte =0x05 os: Atari 140>>14 byte =0x06 os: OS/2 141>>14 byte =0x07 os: MacOS 142>>14 byte =0x0A os: Tops/20 143>>14 byte =0x0B os: WinNT 144>>14 byte =0x0E os: Win32 145>9 beshort >0x0939 146>>9 byte&0xf0 =0x00 - version 0. 147>>9 byte&0xf0 =0x10 - version 1. 148>>9 byte&0xf0 =0x20 - version 2. 149>>9 beshort&0x0fff x \b%03x, 150>>15 byte 1 LZO1X-1, 151>>15 byte 2 LZO1X-1(15), 152>>15 byte 3 LZO1X-999, 153## >>25 bedate >0 last modified: %s, 154>>17 byte =0x00 os: MS-DOS 155>>17 byte =0x01 os: Amiga 156>>17 byte =0x02 os: VMS 157>>17 byte =0x03 os: Unix 158>>17 byte =0x05 os: Atari 159>>17 byte =0x06 os: OS/2 160>>17 byte =0x07 os: MacOS 161>>17 byte =0x0A os: Tops/20 162>>17 byte =0x0B os: WinNT 163>>17 byte =0x0E os: Win32 164 165# 4.3BSD-Quasijarus Strong Compression 166# http://minnie.tuhs.org/Quasijarus/compress.html 1670 string \037\241 Quasijarus strong compressed data 168 169# From: Cory Dikkers <cdikkers@swbell.net> 1700 string XPKF Amiga xpkf.library compressed data 1710 string PP11 Power Packer 1.1 compressed data 1720 string PP20 Power Packer 2.0 compressed data, 173>4 belong 0x09090909 fast compression 174>4 belong 0x090A0A0A mediocre compression 175>4 belong 0x090A0B0B good compression 176>4 belong 0x090A0C0C very good compression 177>4 belong 0x090A0C0D best compression 178 179# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at) 180# http://www.7-zip.org or DOC/7zFormat.txt 181# 1820 string 7z\274\257\047\034 7-zip archive data, 183>6 byte x version %d 184>7 byte x \b.%d 185 186# Type: LZMA 187# URL: http://www.7-zip.org/sdk.html 188# From: Robert Millan <rmh@aybabtu.com> and Reuben Thomas <rrt@sc3d.org> 189# Commented out because apparently not reliable (according to Debian 190# bug #364260) 191#0 string ]\000\000\200\000 LZMA compressed data 192 193# AFX compressed files (Wolfram Kleff) 1942 string -afx- AFX compressed file data 195 196# Supplementary magic data for the file(1) command to support 197# rzip(1). The format is described in magic(5). 198# 199# Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with 200# this file. 201# 2020 string RZIP rzip compressed data 203>4 byte x - version %d 204>5 byte x \b.%d 205>6 belong x (%d bytes) 206