| blob | beb8ebe66a40b8d8fdb186eaffcbbebe35fec666 |
1 #------------------------------------------------------------------------------
2 # $File: compress,v 1.62 2014/09/13 14:27:12 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.
11 # standard unix compress
12 0 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
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).
23 0 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
53 # packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
54 0 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.
60 0 short 0x1f1f old packed data
61 !:mime application/octet-stream
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 #
66 0 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.
70 0 string \377\037 compacted data
71 !:mime application/octet-stream
72 0 short 0145405 huf output
73 !:mime application/octet-stream
75 # bzip2
76 0 string BZh bzip2 compressed data
77 !:mime application/x-bzip2
78 >3 byte >47 \b, block size = %c00k
80 # lzip
81 0 string LZIP lzip compressed data
82 !:mime application/x-lzip
83 >4 byte x \b, version: %d
85 # squeeze and crunch
86 # Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
87 0 beshort 0x76FF squeezed data,
88 >4 string x original name %s
89 0 beshort 0x76FE crunched data,
90 >2 string x original name %s
91 0 beshort 0x76FD LZH compressed data,
92 >2 string x original name %s
94 # Freeze
95 0 string \037\237 frozen file 2.1
96 0 string \037\236 frozen file 1.0 (or gzip 0.5)
98 # SCO compress -H (LZH)
99 0 string \037\240 SCO compress -H (LZH) data
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
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
131 # lzop from <markus.oberhumer@jk.uni-linz.ac.at>
132 0 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
170 # 4.3BSD-Quasijarus Strong Compression
171 # http://minnie.tuhs.org/Quasijarus/compress.html
172 0 string \037\241 Quasijarus strong compressed data
174 # From: Cory Dikkers <cdikkers@swbell.net>
175 0 string XPKF Amiga xpkf.library compressed data
176 0 string PP11 Power Packer 1.1 compressed data
177 0 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
184 # 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
185 # http://www.7-zip.org or DOC/7zFormat.txt
186 #
187 0 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
192 # Type: LZMA
193 0 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
202 # http://tukaani.org/xz/xz-file-format.txt
203 0 ustring \xFD7zXZ\x00 XZ compressed data
204 !:mime application/x-xz
206 # https://github.com/ckolivas/lrzip/blob/master/doc/magic.header.txt
207 0 string LRZI LRZIP compressed data
208 >4 byte x - version %d
209 >5 byte x \b.%d
210 !:mime application/x-lrzip
212 # http://fastcompression.blogspot.fi/2013/04/lz4-streaming-format-final.html
213 0 lelong 0x184d2204 LZ4 compressed data (v1.4+)
214 !:mime application/x-lz4
215 # Added by osm0sis@xda-developers.com
216 0 lelong 0x184c2103 LZ4 compressed data (v1.0-v1.3)
217 !:mime application/x-lz4
218 0 lelong 0x184c2102 LZ4 compressed data (v0.1-v0.9)
219 !:mime application/x-lz4
221 # AFX compressed files (Wolfram Kleff)
222 2 string -afx- AFX compressed file data
224 # Supplementary magic data for the file(1) command to support
225 # rzip(1). The format is described in magic(5).
226 #
227 # Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with
228 # this file.
229 #
230 0 string RZIP rzip compressed data
231 >4 byte x - version %d
232 >5 byte x \b.%d
233 >6 belong x (%d bytes)
235 0 string ArC\x01 FreeArc archive <http://freearc.org>
237 # Type: DACT compressed files
238 0 long 0x444354C3 DACT compressed data
239 >4 byte >-1 (version %i.
240 >5 byte >-1 %i.
241 >6 byte >-1 %i)
242 >7 long >0 , original size: %i bytes
243 >15 long >30 , block size: %i bytes
245 # Valve Pack (VPK) files
246 0 lelong 0x55aa1234 Valve Pak file
247 >0x4 lelong x \b, version %u
248 >0x8 lelong x \b, %u entries
250 # Snappy framing format
251 # http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt
252 0 string \377\006\0\0sNaPpY snappy framed data
253 !:mime application/x-snappy-framed
255 # qpress, http://www.quicklz.com/
256 0 string qpress10 qpress compressed data
257 !:mime application/x-qpress
259 # Zlib https://www.ietf.org/rfc/rfc6713.txt
260 0 beshort%31 =0
261 >0 byte&0xf =8
262 >>0 byte&0x80 =0 zlib compressed data
263 !:mime application/zlib