crc32.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2002 Ben Parnell
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef ZLIB
  22 #include "types.h"
  23 #include "crc32.h"
  24
  25 static uint32 CRC32Table[256] = {
  26         0x00000000,0x77073096,0xee0e612c,0x990951ba,
  27         0x076dc419,0x706af48f,0xe963a535,0x9e6495a3,
  28         0x0edb8832,0x79dcb8a4,0xe0d5e91e,0x97d2d988,
  29         0x09b64c2b,0x7eb17cbd,0xe7b82d07,0x90bf1d91,
  30         0x1db71064,0x6ab020f2,0xf3b97148,0x84be41de,
  31         0x1adad47d,0x6ddde4eb,0xf4d4b551,0x83d385c7,
  32         0x136c9856,0x646ba8c0,0xfd62f97a,0x8a65c9ec,
  33         0x14015c4f,0x63066cd9,0xfa0f3d63,0x8d080df5,
  34         0x3b6e20c8,0x4c69105e,0xd56041e4,0xa2677172,
  35         0x3c03e4d1,0x4b04d447,0xd20d85fd,0xa50ab56b,
  36         0x35b5a8fa,0x42b2986c,0xdbbbc9d6,0xacbcf940,
  37         0x32d86ce3,0x45df5c75,0xdcd60dcf,0xabd13d59,
  38         0x26d930ac,0x51de003a,0xc8d75180,0xbfd06116,
  39         0x21b4f4b5,0x56b3c423,0xcfba9599,0xb8bda50f,
  40         0x2802b89e,0x5f058808,0xc60cd9b2,0xb10be924,
  41         0x2f6f7c87,0x58684c11,0xc1611dab,0xb6662d3d,
  42         0x76dc4190,0x01db7106,0x98d220bc,0xefd5102a,
  43         0x71b18589,0x06b6b51f,0x9fbfe4a5,0xe8b8d433,
  44         0x7807c9a2,0x0f00f934,0x9609a88e,0xe10e9818,
  45         0x7f6a0dbb,0x086d3d2d,0x91646c97,0xe6635c01,
  46         0x6b6b51f4,0x1c6c6162,0x856530d8,0xf262004e,
  47         0x6c0695ed,0x1b01a57b,0x8208f4c1,0xf50fc457,
  48         0x65b0d9c6,0x12b7e950,0x8bbeb8ea,0xfcb9887c,
  49         0x62dd1ddf,0x15da2d49,0x8cd37cf3,0xfbd44c65,
  50         0x4db26158,0x3ab551ce,0xa3bc0074,0xd4bb30e2,
  51         0x4adfa541,0x3dd895d7,0xa4d1c46d,0xd3d6f4fb,
  52         0x4369e96a,0x346ed9fc,0xad678846,0xda60b8d0,
  53         0x44042d73,0x33031de5,0xaa0a4c5f,0xdd0d7cc9,
  54         0x5005713c,0x270241aa,0xbe0b1010,0xc90c2086,
  55         0x5768b525,0x206f85b3,0xb966d409,0xce61e49f,
  56         0x5edef90e,0x29d9c998,0xb0d09822,0xc7d7a8b4,
  57         0x59b33d17,0x2eb40d81,0xb7bd5c3b,0xc0ba6cad,
  58         0xedb88320,0x9abfb3b6,0x03b6e20c,0x74b1d29a,
  59         0xead54739,0x9dd277af,0x04db2615,0x73dc1683,
  60         0xe3630b12,0x94643b84,0x0d6d6a3e,0x7a6a5aa8,
  61         0xe40ecf0b,0x9309ff9d,0x0a00ae27,0x7d079eb1,
  62         0xf00f9344,0x8708a3d2,0x1e01f268,0x6906c2fe,
  63         0xf762575d,0x806567cb,0x196c3671,0x6e6b06e7,
  64         0xfed41b76,0x89d32be0,0x10da7a5a,0x67dd4acc,
  65         0xf9b9df6f,0x8ebeeff9,0x17b7be43,0x60b08ed5,
  66         0xd6d6a3e8,0xa1d1937e,0x38d8c2c4,0x4fdff252,
  67         0xd1bb67f1,0xa6bc5767,0x3fb506dd,0x48b2364b,
  68         0xd80d2bda,0xaf0a1b4c,0x36034af6,0x41047a60,
  69         0xdf60efc3,0xa867df55,0x316e8eef,0x4669be79,
  70         0xcb61b38c,0xbc66831a,0x256fd2a0,0x5268e236,
  71         0xcc0c7795,0xbb0b4703,0x220216b9,0x5505262f,
  72         0xc5ba3bbe,0xb2bd0b28,0x2bb45a92,0x5cb36a04,
  73         0xc2d7ffa7,0xb5d0cf31,0x2cd99e8b,0x5bdeae1d,
  74         0x9b64c2b0,0xec63f226,0x756aa39c,0x026d930a,
  75         0x9c0906a9,0xeb0e363f,0x72076785,0x05005713,
  76         0x95bf4a82,0xe2b87a14,0x7bb12bae,0x0cb61b38,
  77         0x92d28e9b,0xe5d5be0d,0x7cdcefb7,0x0bdbdf21,
  78         0x86d3d2d4,0xf1d4e242,0x68ddb3f8,0x1fda836e,
  79         0x81be16cd,0xf6b9265b,0x6fb077e1,0x18b74777,
  80         0x88085ae6,0xff0f6a70,0x66063bca,0x11010b5c,
  81         0x8f659eff,0xf862ae69,0x616bffd3,0x166ccf45,
  82         0xa00ae278,0xd70dd2ee,0x4e048354,0x3903b3c2,
  83         0xa7672661,0xd06016f7,0x4969474d,0x3e6e77db,
  84         0xaed16a4a,0xd9d65adc,0x40df0b66,0x37d83bf0,
  85         0xa9bcae53,0xdebb9ec5,0x47b2cf7f,0x30b5ffe9,
  86         0xbdbdf21c,0xcabac28a,0x53b39330,0x24b4a3a6,
  87         0xbad03605,0xcdd70693,0x54de5729,0x23d967bf,
  88         0xb3667a2e,0xc4614ab8,0x5d681b02,0x2a6f2b94,
  89         0xb40bbe37,0xc30c8ea1,0x5a05df1b,0x2d02ef8d
  90 };
  91
  92 uint32 CalcCRC32(uint32 crc, uint8 *buf, uint32 len)
  93 {
  94  crc=~crc;
  95
  96  while(len--)
  97   crc=(crc>>8)^CRC32Table[(crc&0xFF)^(*buf++)];
  98  return(~crc);
  99 }
 100 #endif