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Text File  |  1996-02-01  |  4KB  |  88 lines
  1. unsigned long ccitt32_crcinit = -1;
  2.  
  3. static unsigned long crctab[256] = {
  4.     0x0, 0x4c11db7, 0x9823b6e, 0xd4326d9,
  5.     0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
  6.     0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
  7.     0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
  8.     0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
  9.     0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
  10.     0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
  11.     0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
  12.     0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
  13.     0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
  14.     0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
  15.     0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
  16.     0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
  17.     0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
  18.     0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
  19.     0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
  20.     0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
  21.     0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
  22.     0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
  23.     0x18aeb13, 0x54bf6a4, 0x808d07d, 0xcc9cdca,
  24.     0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
  25.     0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
  26.     0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
  27.     0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
  28.     0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
  29.     0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
  30.     0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
  31.     0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
  32.     0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
  33.     0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
  34.     0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
  35.     0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
  36.     0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
  37.     0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
  38.     0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
  39.     0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
  40.     0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
  41.     0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
  42.     0x315d626, 0x7d4cb91, 0xa97ed48, 0xe56f0ff,
  43.     0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
  44.     0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
  45.     0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
  46.     0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
  47.     0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
  48.     0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
  49.     0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
  50.     0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
  51.     0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
  52.     0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
  53.     0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
  54.     0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
  55.     0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
  56.     0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
  57.     0x29f3d35, 0x65e2082, 0xb1d065b, 0xfdc1bec,
  58.     0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
  59.     0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
  60.     0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
  61.     0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
  62.     0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
  63.     0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
  64.     0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
  65.     0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
  66.     0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
  67.     0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4,
  68. };
  69.  
  70. unsigned long ccitt32_updcrc(icrc, icp, icnt)
  71.     unsigned long icrc;
  72.     unsigned char *icp;
  73.     int icnt;
  74. {
  75. #define M1 0xffffff
  76. #define M2 0xffffff00
  77.     register unsigned long _crc = icrc;
  78.     register unsigned char *cp = icp;
  79.     register int cnt = icnt;
  80.  
  81.     while(cnt--) {
  82.     _crc=((_crc<<8)&M2)^crctab[((_crc>>24)&0xff)^*cp++];
  83.     }
  84.  
  85.     return(_crc);
  86. }
  87.  
  88.