apps/codecs/demac/libdemac/crc.c

   1 /*
   2
   3 libdemac - A Monkey's Audio decoder
   4
   5 $Id$
   6
   7 Copyright (C) Dave Chapman 2007
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
  22
  23 */
  24
  25 #include <inttypes.h>
  26 #include "demac.h"
  27
  28 static const uint32_t crctab32[] =
  29 {
  30   0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
  31   0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
  32   0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
  33   0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
  34   0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
  35   0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
  36   0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
  37   0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
  38   0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
  39   0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
  40   0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
  41   0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
  42   0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
  43   0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
  44   0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
  45   0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
  46
  47   0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
  48   0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
  49   0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
  50   0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
  51   0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
  52   0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
  53   0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
  54   0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
  55   0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
  56   0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
  57   0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
  58   0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
  59   0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
  60   0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
  61   0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
  62   0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
  63
  64   0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
  65   0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
  66   0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
  67   0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
  68   0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
  69   0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
  70   0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
  71   0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
  72   0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
  73   0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
  74   0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
  75   0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
  76   0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
  77   0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
  78   0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
  79   0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
  80
  81   0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
  82   0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
  83   0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
  84   0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
  85   0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
  86   0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
  87   0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
  88   0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
  89   0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
  90   0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
  91   0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
  92   0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
  93   0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
  94   0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
  95   0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
  96   0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
  97 };
  98
  99 uint32_t ape_initcrc(void)
 100 {
 101     return 0xffffffff;
 102 }
 103
 104 /* Update the CRC from a block of WAV-format audio data */
 105 uint32_t ape_updatecrc(unsigned char *block, int count, uint32_t crc)
 106 {
 107     while (count--)
 108         crc = (crc >> 8) ^ crctab32[(crc & 0xff) ^ *block++];
 109
 110     return crc;
 111 }
 112
 113 uint32_t ape_finishcrc(uint32_t crc)
 114 {
 115     crc ^= 0xffffffff;
 116     crc >>= 1;
 117
 118     return crc;
 119 }
 120