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Diffstat (limited to 'Magdir/compress')
| -rw-r--r-- | Magdir/compress | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/Magdir/compress b/Magdir/compress new file mode 100644 index 000000000000..e9be46b76c40 --- /dev/null +++ b/Magdir/compress @@ -0,0 +1,189 @@ + +#------------------------------------------------------------------------------ +# compress: file(1) magic for pure-compression formats (no archives) +# +# compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc. +# +# Formats for various forms of compressed data +# Formats for "compress" proper have been moved into "compress.c", +# because it tries to uncompress it to figure out what's inside. + +# standard unix compress +0 string \037\235 compress'd data +>2 byte&0x80 >0 block compressed +>2 byte&0x1f x %d bits + +# gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver) +# Edited by Chris Chittleborough <cchittleborough@yahoo.com.au>, March 2002 +# * Original filename is only at offset 10 if "extra field" absent +# * Produce shorter output - notably, only report compression methods +# other than 8 ("deflate", the only method defined in RFC 1952). +0 string \037\213 gzip compressed data +>2 byte <8 \b, reserved method +>2 byte >8 \b, unknown method +>3 byte &0x01 \b, ASCII +>3 byte &0x02 \b, has CRC +>3 byte &0x04 \b, extra field +>3 byte&0xC =0x08 +>>10 string x \b, was "%s" +>3 byte &0x10 \b, has comment +>9 byte =0x00 \b, from FAT filesystem (MS-DOS, OS/2, NT) +>9 byte =0x01 \b, from Amiga +>9 byte =0x02 \b, from VMS +>9 byte =0x03 \b, from Unix +>9 byte =0x04 \b, from VM/CMS +>9 byte =0x05 \b, from Atari +>9 byte =0x06 \b, from HPFS filesystem (OS/2, NT) +>9 byte =0x07 \b, from MacOS +>9 byte =0x08 \b, from Z-System +>9 byte =0x09 \b, from CP/M +>9 byte =0x0A \b, from TOPS/20 +>9 byte =0x0B \b, from NTFS filesystem (NT) +>9 byte =0x0C \b, from QDOS +>9 byte =0x0D \b, from Acorn RISCOS +>3 byte &0x10 \b, comment +>3 byte &0x20 \b, encrypted +>4 ledate >0 \b, last modified: %s +>8 byte 2 \b, max compression +>8 byte 4 \b, max speed + +# packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis +0 string \037\036 packed data +>2 belong >1 \b, %d characters originally +>2 belong =1 \b, %d character originally +# +# This magic number is byte-order-independent. +0 short 0x1f1f old packed data + +# XXX - why *two* entries for "compacted data", one of which is +# byte-order independent, and one of which is byte-order dependent? +# +0 short 0x1fff compacted data +# This string is valid for SunOS (BE) and a matching "short" is listed +# in the Ultrix (LE) magic file. +0 string \377\037 compacted data +0 short 0145405 huf output + +# bzip2 +0 string BZh bzip2 compressed data +>3 byte >47 \b, block size = %c00k + +# squeeze and crunch +# Michael Haardt <michael@cantor.informatik.rwth-aachen.de> +0 beshort 0x76FF squeezed data, +>4 string x original name %s +0 beshort 0x76FE crunched data, +>2 string x original name %s +0 beshort 0x76FD LZH compressed data, +>2 string x original name %s + +# Freeze +0 string \037\237 frozen file 2.1 +0 string \037\236 frozen file 1.0 (or gzip 0.5) + +# SCO compress -H (LZH) +0 string \037\240 SCO compress -H (LZH) data + +# European GSM 06.10 is a provisional standard for full-rate speech +# transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse +# excitation/long term prediction) coding at 13 kbit/s. +# +# There's only a magic nibble (4 bits); that nibble repeats every 33 +# bytes. This isn't suited for use, but maybe we can use it someday. +# +# This will cause very short GSM files to be declared as data and +# mismatches to be declared as data too! +#0 byte&0xF0 0xd0 data +#>33 byte&0xF0 0xd0 +#>66 byte&0xF0 0xd0 +#>99 byte&0xF0 0xd0 +#>132 byte&0xF0 0xd0 GSM 06.10 compressed audio + +# bzip a block-sorting file compressor +# by Julian Seward <sewardj@cs.man.ac.uk> and others +# +0 string BZ bzip compressed data +>2 byte x \b, version: %c +>3 string =1 \b, compression block size 100k +>3 string =2 \b, compression block size 200k +>3 string =3 \b, compression block size 300k +>3 string =4 \b, compression block size 400k +>3 string =5 \b, compression block size 500k +>3 string =6 \b, compression block size 600k +>3 string =7 \b, compression block size 700k +>3 string =8 \b, compression block size 800k +>3 string =9 \b, compression block size 900k + +# lzop from <markus.oberhumer@jk.uni-linz.ac.at> +0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data +>9 beshort <0x0940 +>>9 byte&0xf0 =0x00 - version 0. +>>9 beshort&0x0fff x \b%03x, +>>13 byte 1 LZO1X-1, +>>13 byte 2 LZO1X-1(15), +>>13 byte 3 LZO1X-999, +## >>22 bedate >0 last modified: %s, +>>14 byte =0x00 os: MS-DOS +>>14 byte =0x01 os: Amiga +>>14 byte =0x02 os: VMS +>>14 byte =0x03 os: Unix +>>14 byte =0x05 os: Atari +>>14 byte =0x06 os: OS/2 +>>14 byte =0x07 os: MacOS +>>14 byte =0x0A os: Tops/20 +>>14 byte =0x0B os: WinNT +>>14 byte =0x0E os: Win32 +>9 beshort >0x0939 +>>9 byte&0xf0 =0x00 - version 0. +>>9 byte&0xf0 =0x10 - version 1. +>>9 byte&0xf0 =0x20 - version 2. +>>9 beshort&0x0fff x \b%03x, +>>15 byte 1 LZO1X-1, +>>15 byte 2 LZO1X-1(15), +>>15 byte 3 LZO1X-999, +## >>25 bedate >0 last modified: %s, +>>17 byte =0x00 os: MS-DOS +>>17 byte =0x01 os: Amiga +>>17 byte =0x02 os: VMS +>>17 byte =0x03 os: Unix +>>17 byte =0x05 os: Atari +>>17 byte =0x06 os: OS/2 +>>17 byte =0x07 os: MacOS +>>17 byte =0x0A os: Tops/20 +>>17 byte =0x0B os: WinNT +>>17 byte =0x0E os: Win32 + +# 4.3BSD-Quasijarus Strong Compression +# http://minnie.tuhs.org/Quasijarus/compress.html +0 string \037\241 Quasijarus strong compressed data + +# From: Cory Dikkers <cdikkers@swbell.net> +0 string XPKF Amiga xpkf.library compressed data +0 string PP11 Power Packer 1.1 compressed data +0 string PP20 Power Packer 2.0 compressed data, +>4 belong 0x09090909 fast compression +>4 belong 0x090A0A0A mediocre compression +>4 belong 0x090A0B0B good compression +>4 belong 0x090A0C0C very good compression +>4 belong 0x090A0C0D best compression + +# 7-zip archiver, from Thomas Klausner (wiz@danbala.tuwien.ac.at) +# http://www.7-zip.org or DOC/7zFormat.txt +# +0 string 7z\274\257\047\034 7-zip archive data, +>6 byte x version %d +>7 byte x \b.%d + +# AFX compressed files (Wolfram Kleff) +2 string -afx- AFX compressed file data + +# Supplementary magic data for the file(1) command to support +# rzip(1). The format is described in magic(5). +# +# Copyright (C) 2003 by Andrew Tridgell. You may do whatever you want with +# this file. +# +0 string RZIP rzip compressed data +>4 byte x - version %d +>5 byte x \b.%d +>6 belong x (%d bytes) |