compress 4.8 KB

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  1. #------------------------------------------------------------------------------
  2. # compress: file(1) magic for pure-compression formats (no archives)
  3. #
  4. # compress, gzip, pack, compact, huf, squeeze, crunch, freeze, yabba, etc.
  5. #
  6. # Formats for various forms of compressed data
  7. # Formats for "compress" proper have been moved into "compress.c",
  8. # because it tries to uncompress it to figure out what's inside.
  9. # standard unix compress
  10. 0 string \037\235 compress'd data
  11. >2 byte&0x80 >0 block compressed
  12. >2 byte&0x1f x %d bits
  13. # gzip (GNU zip, not to be confused with Info-ZIP or PKWARE zip archiver)
  14. 0 string \037\213 gzip compressed data
  15. >2 byte <8 \b, reserved method,
  16. >2 byte 8 \b, deflated,
  17. >3 byte &0x01 ASCII,
  18. >3 byte &0x02 continuation,
  19. >3 byte &0x04 extra field,
  20. >3 byte &0x08 original filename,
  21. >>10 string x `%s',
  22. >3 byte &0x10 comment,
  23. >3 byte &0x20 encrypted,
  24. >4 ledate x last modified: %s,
  25. >8 byte 2 max compression,
  26. >8 byte 4 max speed,
  27. >9 byte =0x00 os: MS-DOS
  28. >9 byte =0x01 os: Amiga
  29. >9 byte =0x02 os: VMS
  30. >9 byte =0x03 os: Unix
  31. >9 byte =0x05 os: Atari
  32. >9 byte =0x06 os: OS/2
  33. >9 byte =0x07 os: MacOS
  34. >9 byte =0x0A os: Tops/20
  35. >9 byte =0x0B os: Win/32
  36. # packed data, Huffman (minimum redundancy) codes on a byte-by-byte basis
  37. 0 string \037\036 packed data
  38. >2 belong >1 \b, %d characters originally
  39. >2 belong =1 \b, %d character originally
  40. #
  41. # This magic number is byte-order-independent. XXX - Does that mean this
  42. # is big-endian, little-endian, either, or that you can't tell?
  43. # this short is valid for SunOS
  44. 0 short 017437 old packed data
  45. # XXX - why *two* entries for "compacted data", one of which is
  46. # byte-order independent, and one of which is byte-order dependent?
  47. #
  48. 0 short 0x1fff compacted data
  49. # This string is valid for SunOS (BE) and a matching "short" is listed
  50. # in the Ultrix (LE) magic file.
  51. 0 string \377\037 compacted data
  52. 0 short 0145405 huf output
  53. # bzip2
  54. 0 string BZh bzip2 compressed data
  55. >3 byte >47 \b, block size = %c00k
  56. # squeeze and crunch
  57. # Michael Haardt <michael@cantor.informatik.rwth-aachen.de>
  58. 0 beshort 0x76FF squeezed data,
  59. >4 string x original name %s
  60. 0 beshort 0x76FE crunched data,
  61. >2 string x original name %s
  62. 0 beshort 0x76FD LZH compressed data,
  63. >2 string x original name %s
  64. # Freeze
  65. 0 string \037\237 frozen file 2.1
  66. 0 string \037\236 frozen file 1.0 (or gzip 0.5)
  67. # SCO compress -H (LZH)
  68. 0 string \037\240 SCO compress -H (LZH) data
  69. # European GSM 06.10 is a provisional standard for full-rate speech
  70. # transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
  71. # excitation/long term prediction) coding at 13 kbit/s.
  72. #
  73. # There's only a magic nibble (4 bits); that nibble repeats every 33
  74. # bytes. This isn't suited for use, but maybe we can use it someday.
  75. #
  76. # This will cause very short GSM files to be declared as data and
  77. # mismatches to be declared as data too!
  78. #0 byte&0xF0 0xd0 data
  79. #>33 byte&0xF0 0xd0
  80. #>66 byte&0xF0 0xd0
  81. #>99 byte&0xF0 0xd0
  82. #>132 byte&0xF0 0xd0 GSM 06.10 compressed audio
  83. # bzip a block-sorting file compressor
  84. # by Julian Seward <sewardj@cs.man.ac.uk> and others
  85. #
  86. 0 string BZ bzip compressed data
  87. >2 byte x \b, version: %c
  88. >3 string =1 \b, compression block size 100k
  89. >3 string =2 \b, compression block size 200k
  90. >3 string =3 \b, compression block size 300k
  91. >3 string =4 \b, compression block size 400k
  92. >3 string =5 \b, compression block size 500k
  93. >3 string =6 \b, compression block size 600k
  94. >3 string =7 \b, compression block size 700k
  95. >3 string =8 \b, compression block size 800k
  96. >3 string =9 \b, compression block size 900k
  97. # lzop from <markus.oberhumer@jk.uni-linz.ac.at>
  98. 0 string \x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a lzop compressed data
  99. >9 beshort <0x0940
  100. >>9 byte&0xf0 =0x00 - version 0.
  101. >>9 beshort&0x0fff x \b%03x,
  102. >>13 byte 1 LZO1X-1,
  103. >>13 byte 2 LZO1X-1(15),
  104. >>13 byte 3 LZO1X-999,
  105. ## >>22 bedate >0 last modified: %s,
  106. >>14 byte =0x00 os: MS-DOS
  107. >>14 byte =0x01 os: Amiga
  108. >>14 byte =0x02 os: VMS
  109. >>14 byte =0x03 os: Unix
  110. >>14 byte =0x05 os: Atari
  111. >>14 byte =0x06 os: OS/2
  112. >>14 byte =0x07 os: MacOS
  113. >>14 byte =0x0A os: Tops/20
  114. >>14 byte =0x0B os: WinNT
  115. >>14 byte =0x0E os: Win32
  116. >9 beshort >0x0939
  117. >>9 byte&0xf0 =0x00 - version 0.
  118. >>9 byte&0xf0 =0x10 - version 1.
  119. >>9 byte&0xf0 =0x20 - version 2.
  120. >>9 beshort&0x0fff x \b%03x,
  121. >>15 byte 1 LZO1X-1,
  122. >>15 byte 2 LZO1X-1(15),
  123. >>15 byte 3 LZO1X-999,
  124. ## >>25 bedate >0 last modified: %s,
  125. >>17 byte =0x00 os: MS-DOS
  126. >>17 byte =0x01 os: Amiga
  127. >>17 byte =0x02 os: VMS
  128. >>17 byte =0x03 os: Unix
  129. >>17 byte =0x05 os: Atari
  130. >>17 byte =0x06 os: OS/2
  131. >>17 byte =0x07 os: MacOS
  132. >>17 byte =0x0A os: Tops/20
  133. >>17 byte =0x0B os: WinNT
  134. >>17 byte =0x0E os: Win32
  135. # AFX compressed files (Wolfram Kleff)
  136. 2 string -afx- AFX compressed file data