2 #------------------------------------------------------------------------------
3 # compress: file(1) magic for pure-compression formats (no archives)
5 # compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc.
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 >2 byte&0x80 >0 block compressed
14 >2 byte&0x1f x %d bits
16 # gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver)
17 # Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002
18 # * Original filename is only at offset 10 if "extra field" absent
19 # * Produce shorter output - notably, only report compression methods
20 # other than 8 ("deflate", the only method defined in RFC 1952).
21 0 string \037\213 gzip compressed data
22 >2 byte <8 \b, reserved method
23 >2 byte >8 \b, unknown method
24 >3 byte &0x01 \b, ASCII
25 >3 byte &0x02 \b, continuation
26 >3 byte &0x04 \b, extra field
28 >>10 string x \b, was "%s"
29 >9 byte =0x00 \b, from MS-DOS
30 >9 byte =0x01 \b, from Amiga
31 >9 byte =0x02 \b, from VMS
32 >9 byte =0x03 \b, from Unix
33 >9 byte =0x05 \b, from Atari
34 >9 byte =0x06 \b, from OS/2
35 >9 byte =0x07 \b, from MacOS
36 >9 byte =0x0A \b, from Tops/20
37 >9 byte =0x0B \b, from Win/32
38 >3 byte &0x10 \b, comment
39 >3 byte &0x20 \b, encrypted
40 ### >4 ledate x last modified: %s,
41 >8 byte 2 \b, max compression
42 >8 byte 4 \b, max speed
44 # packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
45 0 string \037\036 packed data
46 >2 belong >1 \b, %d characters originally
47 >2 belong =1 \b, %d character originally
49 # This magic number is byte-order-independent. XXX - Does that mean this
50 # is big-endian, little-endian, either, or that you can't tell?
51 # this short is valid for SunOS
52 0 short 017437 old packed data
54 # XXX - why *two* entries for "compacted data", one of which is
55 # byte-order independent, and one of which is byte-order dependent?
57 0 short 0x1fff compacted data
58 # This string is valid for SunOS (BE) and a matching "short" is listed
59 # in the Ultrix (LE) magic file.
60 0 string \377\037 compacted data
61 0 short 0145405 huf output
64 0 string BZh bzip2 compressed data
65 >3 byte >47 \b, block size = %c00k
68 # Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
69 0 beshort 0x76FF squeezed data,
70 >4 string x original name %s
71 0 beshort 0x76FE crunched data,
72 >2 string x original name %s
73 0 beshort 0x76FD LZH compressed data,
74 >2 string x original name %s
77 0 string \037\237 frozen file 2.1
78 0 string \037\236 frozen file 1.0 (or gzip 0.5)
80 # SCO compress -H (LZH)
81 0 string \037\240 SCO compress -H (LZH) data
83 # European GSM 06.10 is a provisional standard for full-rate speech
84 # transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
85 # excitation/long term prediction) coding at 13 kbit/s.
87 # There's only a magic nibble (4 bits); that nibble repeats every 33
88 # bytes. This isn't suited for use, but maybe we can use it someday.
90 # This will cause very short GSM files to be declared as data and
91 # mismatches to be declared as data too!
92 #0 byte&0xF0 0xd0 data
96 #>132 byte&0xF0 0xd0 GSM 06.10 compressed audio
98 # bzip a block-sorting file compressor
99 # by Julian Seward <sewardj@cs.man.ac.uk> and others
101 0 string BZ bzip compressed data
102 >2 byte x \b, version: %c
103 >3 string =1 \b, compression block size 100k
104 >3 string =2 \b, compression block size 200k
105 >3 string =3 \b, compression block size 300k
106 >3 string =4 \b, compression block size 400k
107 >3 string =5 \b, compression block size 500k
108 >3 string =6 \b, compression block size 600k
109 >3 string =7 \b, compression block size 700k
110 >3 string =8 \b, compression block size 800k
111 >3 string =9 \b, compression block size 900k
113 # lzop from <markus.oberhumer@jk.uni-linz.ac.at>
114 0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data
116 >>9 byte&0xf0 =0x00 - version 0.
117 >>9 beshort&0x0fff x \b%03x,
119 >>13 byte 2 LZO1X-1(15),
120 >>13 byte 3 LZO1X-999,
121 ## >>22 bedate >0 last modified: %s,
122 >>14 byte =0x00 os: MS-DOS
123 >>14 byte =0x01 os: Amiga
124 >>14 byte =0x02 os: VMS
125 >>14 byte =0x03 os: Unix
126 >>14 byte =0x05 os: Atari
127 >>14 byte =0x06 os: OS/2
128 >>14 byte =0x07 os: MacOS
129 >>14 byte =0x0A os: Tops/20
130 >>14 byte =0x0B os: WinNT
131 >>14 byte =0x0E os: Win32
133 >>9 byte&0xf0 =0x00 - version 0.
134 >>9 byte&0xf0 =0x10 - version 1.
135 >>9 byte&0xf0 =0x20 - version 2.
136 >>9 beshort&0x0fff x \b%03x,
138 >>15 byte 2 LZO1X-1(15),
139 >>15 byte 3 LZO1X-999,
140 ## >>25 bedate >0 last modified: %s,
141 >>17 byte =0x00 os: MS-DOS
142 >>17 byte =0x01 os: Amiga
143 >>17 byte =0x02 os: VMS
144 >>17 byte =0x03 os: Unix
145 >>17 byte =0x05 os: Atari
146 >>17 byte =0x06 os: OS/2
147 >>17 byte =0x07 os: MacOS
148 >>17 byte =0x0A os: Tops/20
149 >>17 byte =0x0B os: WinNT
150 >>17 byte =0x0E os: Win32
152 # 4.3BSD-Quasijarus Strong Compression
153 # http://minnie.tuhs.org/Quasijarus/compress.html
154 0 string \037\241 Quasijarus strong compressed data
156 # From: Cory Dikkers <cdikkers@swbell.net>
157 0 string XPKF Amiga xpkf.library compressed data
158 0 string PP11 Power Packer 1.1 compressed data
159 0 string PP20 Power Packer 2.0 compressed data,
160 >4 belong 0x09090909 fast compression
161 >4 belong 0x090A0A0A mediocre compression
162 >4 belong 0x090A0B0B good compression
163 >4 belong 0x090A0C0C very good compression
164 >4 belong 0x090A0C0D best compression
166 # 7z archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at)
167 # http://www.7-zip.org or DOC/7zFormat.txt
169 0 string 7z\274\257\047\034 7z archive data,