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Perl POD Document  |  2009-06-26  |  1.6 KB  |  78 lines
  1.  
  2. package IO::Compress::Zlib::Constants ;
  3.  
  4. use strict ;
  5. use warnings;
  6. use bytes;
  7.  
  8. require Exporter;
  9.  
  10. our ($VERSION, @ISA, @EXPORT);
  11.  
  12. $VERSION = '2.008';
  13.  
  14. @ISA = qw(Exporter);
  15.  
  16. @EXPORT= qw(
  17.  
  18.         ZLIB_HEADER_SIZE
  19.         ZLIB_TRAILER_SIZE
  20.  
  21.         ZLIB_CMF_CM_OFFSET
  22.         ZLIB_CMF_CM_BITS
  23.         ZLIB_CMF_CM_DEFLATED
  24.  
  25.         ZLIB_CMF_CINFO_OFFSET
  26.         ZLIB_CMF_CINFO_BITS 
  27.         ZLIB_CMF_CINFO_MAX
  28.  
  29.         ZLIB_FLG_FCHECK_OFFSET
  30.         ZLIB_FLG_FCHECK_BITS
  31.  
  32.         ZLIB_FLG_FDICT_OFFSET
  33.         ZLIB_FLG_FDICT_BITS
  34.  
  35.         ZLIB_FLG_LEVEL_OFFSET
  36.         ZLIB_FLG_LEVEL_BITS
  37.  
  38.         ZLIB_FLG_LEVEL_FASTEST
  39.         ZLIB_FLG_LEVEL_FAST
  40.         ZLIB_FLG_LEVEL_DEFAULT
  41.         ZLIB_FLG_LEVEL_SLOWEST
  42.  
  43.         ZLIB_FDICT_SIZE
  44.  
  45.         );
  46.  
  47. # Constant names derived from RFC1950
  48.  
  49. use constant ZLIB_HEADER_SIZE       => 2;
  50. use constant ZLIB_TRAILER_SIZE      => 4;
  51.  
  52. use constant ZLIB_CMF_CM_OFFSET     => 0;
  53. use constant ZLIB_CMF_CM_BITS       => 0xF ; # 0b1111
  54. use constant ZLIB_CMF_CM_DEFLATED   => 8;
  55.  
  56. use constant ZLIB_CMF_CINFO_OFFSET  => 4;
  57. use constant ZLIB_CMF_CINFO_BITS    => 0xF ; # 0b1111;
  58. use constant ZLIB_CMF_CINFO_MAX     => 7;
  59.  
  60. use constant ZLIB_FLG_FCHECK_OFFSET => 0;
  61. use constant ZLIB_FLG_FCHECK_BITS   => 0x1F ; # 0b11111;
  62.  
  63. use constant ZLIB_FLG_FDICT_OFFSET  => 5;
  64. use constant ZLIB_FLG_FDICT_BITS    => 0x1 ; # 0b1;
  65.  
  66. use constant ZLIB_FLG_LEVEL_OFFSET  => 6;
  67. use constant ZLIB_FLG_LEVEL_BITS    => 0x3 ; # 0b11;
  68.  
  69. use constant ZLIB_FLG_LEVEL_FASTEST => 0;
  70. use constant ZLIB_FLG_LEVEL_FAST    => 1;
  71. use constant ZLIB_FLG_LEVEL_DEFAULT => 2;
  72. use constant ZLIB_FLG_LEVEL_SLOWEST => 3;
  73.  
  74. use constant ZLIB_FDICT_SIZE        => 4;
  75.  
  76.  
  77. 1;
  78.