compress revision 299236
1#------------------------------------------------------------------------------ 2# $File: compress,v 1.64 2015/07/27 15:41:09 christos Exp $ 3# compress: file(1) magic for pure-compression formats (no archives) 4# 5# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc. 6# 7# Formats for various forms of compressed data 8# Formats for "compress" proper have been moved into "compress.c", 9# because it tries to uncompress it to figure out what's inside. 10 11# standard unix compress 120 string \037\235 compress'd data 13!:mime application/x-compress 14!:apple LZIVZIVU 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!:strength * 2 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>3 byte &0x20 \b, encrypted 35>4 ledate >0 \b, last modified: %s 36>8 byte 2 \b, max compression 37>8 byte 4 \b, max speed 38>9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT) 39>9 byte =0x01 \b, from Amiga 40>9 byte =0x02 \b, from VMS 41>9 byte =0x03 \b, from Unix 42>9 byte =0x04 \b, from VM/CMS 43>9 byte =0x05 \b, from Atari 44>9 byte =0x06 \b, from HPFS filesystem (OS/2, NT) 45>9 byte =0x07 \b, from MacOS 46>9 byte =0x08 \b, from Z-System 47>9 byte =0x09 \b, from CP/M 48>9 byte =0x0A \b, from TOPS/20 49>9 byte =0x0B \b, from NTFS filesystem (NT) 50>9 byte =0x0C \b, from QDOS 51>9 byte =0x0D \b, from Acorn RISCOS 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# lzip 810 string LZIP lzip compressed data 82!:mime application/x-lzip 83>4 byte x \b, version: %d 84 85# squeeze and crunch 86# Michael Haardt <michael@cantor.informatik.rwth-aachen.de> 870 beshort 0x76FF squeezed data, 88>4 string x original name %s 890 beshort 0x76FE crunched data, 90>2 string x original name %s 910 beshort 0x76FD LZH compressed data, 92>2 string x original name %s 93 94# Freeze 950 string \037\237 frozen file 2.1 960 string \037\236 frozen file 1.0 (or gzip 0.5) 97 98# SCO compress -H (LZH) 990 string \037\240 SCO compress -H (LZH) data 100 101# European GSM 06.10 is a provisional standard for full-rate speech 102# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse 103# excitation/long term prediction) coding at 13 kbit/s. 104# 105# There's only a magic nibble (4 bits); that nibble repeats every 33 106# bytes. This isn't suited for use, but maybe we can use it someday. 107# 108# This will cause very short GSM files to be declared as data and 109# mismatches to be declared as data too! 110#0 byte&0xF0 0xd0 data 111#>33 byte&0xF0 0xd0 112#>66 byte&0xF0 0xd0 113#>99 byte&0xF0 0xd0 114#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio 115 116# bzip a block-sorting file compressor 117# by Julian Seward <sewardj@cs.man.ac.uk> and others 118# 119#0 string BZ bzip compressed data 120#>2 byte x \b, version: %c 121#>3 string =1 \b, compression block size 100k 122#>3 string =2 \b, compression block size 200k 123#>3 string =3 \b, compression block size 300k 124#>3 string =4 \b, compression block size 400k 125#>3 string =5 \b, compression block size 500k 126#>3 string =6 \b, compression block size 600k 127#>3 string =7 \b, compression block size 700k 128#>3 string =8 \b, compression block size 800k 129#>3 string =9 \b, compression block size 900k 130 131# lzop from <markus.oberhumer@jk.uni-linz.ac.at> 1320 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data 133>9 beshort <0x0940 134>>9 byte&0xf0 =0x00 - version 0. 135>>9 beshort&0x0fff x \b%03x, 136>>13 byte 1 LZO1X-1, 137>>13 byte 2 LZO1X-1(15), 138>>13 byte 3 LZO1X-999, 139## >>22 bedate >0 last modified: %s, 140>>14 byte =0x00 os: MS-DOS 141>>14 byte =0x01 os: Amiga 142>>14 byte =0x02 os: VMS 143>>14 byte =0x03 os: Unix 144>>14 byte =0x05 os: Atari 145>>14 byte =0x06 os: OS/2 146>>14 byte =0x07 os: MacOS 147>>14 byte =0x0A os: Tops/20 148>>14 byte =0x0B os: WinNT 149>>14 byte =0x0E os: Win32 150>9 beshort >0x0939 151>>9 byte&0xf0 =0x00 - version 0. 152>>9 byte&0xf0 =0x10 - version 1. 153>>9 byte&0xf0 =0x20 - version 2. 154>>9 beshort&0x0fff x \b%03x, 155>>15 byte 1 LZO1X-1, 156>>15 byte 2 LZO1X-1(15), 157>>15 byte 3 LZO1X-999, 158## >>25 bedate >0 last modified: %s, 159>>17 byte =0x00 os: MS-DOS 160>>17 byte =0x01 os: Amiga 161>>17 byte =0x02 os: VMS 162>>17 byte =0x03 os: Unix 163>>17 byte =0x05 os: Atari 164>>17 byte =0x06 os: OS/2 165>>17 byte =0x07 os: MacOS 166>>17 byte =0x0A os: Tops/20 167>>17 byte =0x0B os: WinNT 168>>17 byte =0x0E os: Win32 169 170# 4.3BSD-Quasijarus Strong Compression 171# http://minnie.tuhs.org/Quasijarus/compress.html 1720 string \037\241 Quasijarus strong compressed data 173 174# From: Cory Dikkers <cdikkers@swbell.net> 1750 string XPKF Amiga xpkf.library compressed data 1760 string PP11 Power Packer 1.1 compressed data 1770 string PP20 Power Packer 2.0 compressed data, 178>4 belong 0x09090909 fast compression 179>4 belong 0x090A0A0A mediocre compression 180>4 belong 0x090A0B0B good compression 181>4 belong 0x090A0C0C very good compression 182>4 belong 0x090A0C0D best compression 183 184# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at) 185# http://www.7-zip.org or DOC/7zFormat.txt 186# 1870 string 7z\274\257\047\034 7-zip archive data, 188>6 byte x version %d 189>7 byte x \b.%d 190!:mime application/x-7z-compressed 191 192# Type: LZMA 1930 lelong&0xffffff =0x5d 194>12 leshort 0xff LZMA compressed data, 195!:mime application/x-lzma 196>>5 lequad =0xffffffffffffffff streamed 197>>5 lequad !0xffffffffffffffff non-streamed, size %lld 198>12 leshort 0 LZMA compressed data, 199>>5 lequad =0xffffffffffffffff streamed 200>>5 lequad !0xffffffffffffffff non-streamed, size %lld 201 202# http://tukaani.org/xz/xz-file-format.txt 2030 ustring \xFD7zXZ\x00 XZ compressed data 204!:strength * 2 205!:mime application/x-xz 206 207# https://github.com/ckolivas/lrzip/blob/master/doc/magic.header.txt 2080 string LRZI LRZIP compressed data 209>4 byte x - version %d 210>5 byte x \b.%d 211!:mime application/x-lrzip 212 213# http://fastcompression.blogspot.fi/2013/04/lz4-streaming-format-final.html 2140 lelong 0x184d2204 LZ4 compressed data (v1.4+) 215!:mime application/x-lz4 216# Added by osm0sis@xda-developers.com 2170 lelong 0x184c2103 LZ4 compressed data (v1.0-v1.3) 218!:mime application/x-lz4 2190 lelong 0x184c2102 LZ4 compressed data (v0.1-v0.9) 220!:mime application/x-lz4 221 222# AFX compressed files (Wolfram Kleff) 2232 string -afx- AFX compressed file data 224 225# Supplementary magic data for the file(1) command to support 226# rzip(1). The format is described in magic(5). 227# 228# Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with 229# this file. 230# 2310 string RZIP rzip compressed data 232>4 byte x - version %d 233>5 byte x \b.%d 234>6 belong x (%d bytes) 235 2360 string ArC\x01 FreeArc archive <http://freearc.org> 237 238# Type: DACT compressed files 2390 long 0x444354C3 DACT compressed data 240>4 byte >-1 (version %i. 241>5 byte >-1 %i. 242>6 byte >-1 %i) 243>7 long >0 , original size: %i bytes 244>15 long >30 , block size: %i bytes 245 246# Valve Pack (VPK) files 2470 lelong 0x55aa1234 Valve Pak file 248>0x4 lelong x \b, version %u 249>0x8 lelong x \b, %u entries 250 251# Snappy framing format 252# http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt 2530 string \377\006\0\0sNaPpY snappy framed data 254!:mime application/x-snappy-framed 255 256# qpress, http://www.quicklz.com/ 2570 string qpress10 qpress compressed data 258!:mime application/x-qpress 259 260# Zlib https://www.ietf.org/rfc/rfc6713.txt 2610 string/b x 262>0 beshort%31 =0 263>>0 byte&0xf =8 264>>>0 byte&0x80 =0 zlib compressed data 265!:mime application/zlib 266