| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: crc32.c,v 1.4 1999/06/01 09:47:22 mdw Exp $ |
| 4 | * |
| 5 | * Calculating cyclic redundancy values (non-cryptographic!) |
| 6 | * |
| 7 | * (c) 1998 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of the mLib utilities library. |
| 13 | * |
| 14 | * mLib is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * mLib is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with mLib; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: crc32.c,v $ |
| 33 | * Revision 1.4 1999/06/01 09:47:22 mdw |
| 34 | * Make the return type of `crc32' a `uint32' now that we have `bits.h'. |
| 35 | * |
| 36 | * Revision 1.3 1999/05/06 19:51:35 mdw |
| 37 | * Reformatted the LGPL notice a little bit. |
| 38 | * |
| 39 | * Revision 1.2 1999/05/05 18:50:31 mdw |
| 40 | * Change licensing conditions to LGPL. |
| 41 | * |
| 42 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
| 43 | * Initial version of mLib |
| 44 | * |
| 45 | */ |
| 46 | |
| 47 | /*----- Header files ------------------------------------------------------*/ |
| 48 | |
| 49 | /* --- ANSI headers --- */ |
| 50 | |
| 51 | #include <stdio.h> |
| 52 | #include <stdlib.h> |
| 53 | #include <string.h> |
| 54 | |
| 55 | /* --- Local headers --- */ |
| 56 | |
| 57 | #include "bits.h" |
| 58 | #include "crc32.h" |
| 59 | |
| 60 | /*----- CRC table ---------------------------------------------------------*/ |
| 61 | |
| 62 | /* --- Acknowledgements and information --- * |
| 63 | * |
| 64 | * This table was generated using a derivative of the Rocksoft Model CRC |
| 65 | * generator. The parameters given are: |
| 66 | * |
| 67 | * width = 32bits |
| 68 | * poly = 0x04C11DB7 |
| 69 | * init = -1 |
| 70 | * xorout = -1 |
| 71 | * reverse = yes |
| 72 | * check = crc(123456789) = 0xCBF43926 |
| 73 | */ |
| 74 | |
| 75 | uint32 crc32_table[256] = { |
| 76 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
| 77 | 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, |
| 78 | 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, |
| 79 | 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, |
| 80 | 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, |
| 81 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, |
| 82 | 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, |
| 83 | 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, |
| 84 | 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, |
| 85 | 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, |
| 86 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, |
| 87 | 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, |
| 88 | 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, |
| 89 | 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, |
| 90 | 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, |
| 91 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, |
| 92 | 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, |
| 93 | 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, |
| 94 | 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, |
| 95 | 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, |
| 96 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, |
| 97 | 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, |
| 98 | 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, |
| 99 | 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, |
| 100 | 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, |
| 101 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, |
| 102 | 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, |
| 103 | 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, |
| 104 | 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, |
| 105 | 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, |
| 106 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, |
| 107 | 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, |
| 108 | 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, |
| 109 | 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, |
| 110 | 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, |
| 111 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, |
| 112 | 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, |
| 113 | 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, |
| 114 | 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, |
| 115 | 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, |
| 116 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, |
| 117 | 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, |
| 118 | 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, |
| 119 | 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, |
| 120 | 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, |
| 121 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, |
| 122 | 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, |
| 123 | 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, |
| 124 | 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, |
| 125 | 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, |
| 126 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, |
| 127 | 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, |
| 128 | 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, |
| 129 | 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, |
| 130 | 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, |
| 131 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, |
| 132 | 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, |
| 133 | 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, |
| 134 | 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, |
| 135 | 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, |
| 136 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, |
| 137 | 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, |
| 138 | 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, |
| 139 | 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d, |
| 140 | }; |
| 141 | |
| 142 | /*----- Functionc provided ------------------------------------------------*/ |
| 143 | |
| 144 | /* --- @crc32@ --- * |
| 145 | * |
| 146 | * Arguments: @uint32 crc@ = carryover from previous call, or zero |
| 147 | * @const void *buf@ = pointer to buffer to check |
| 148 | * @size_t sz@ = size of the buffer |
| 149 | * |
| 150 | * Returns: The CRC updated by the new buffer. |
| 151 | * |
| 152 | * Use: A restartable CRC calculator. This is just a function |
| 153 | * wrapper for the macro version. |
| 154 | */ |
| 155 | |
| 156 | uint32 crc32(uint32 crc, const void *buf, size_t sz) |
| 157 | { |
| 158 | uint32 c; |
| 159 | CRC32(c, crc, buf, sz); |
| 160 | return (c); |
| 161 | } |
| 162 | |
| 163 | /*----- Test driver -------------------------------------------------------*/ |
| 164 | |
| 165 | #ifdef TEST_RIG |
| 166 | |
| 167 | #include <stdio.h> |
| 168 | |
| 169 | int main(void) |
| 170 | { |
| 171 | uint32 crc = 0; |
| 172 | char buf[BUFSIZ]; |
| 173 | int r; |
| 174 | |
| 175 | do { |
| 176 | r = fread(buf, 1, sizeof(buf), stdin); |
| 177 | if (r > 0) |
| 178 | crc = crc32(crc, buf, r); |
| 179 | } while (r == sizeof(buf)); |
| 180 | |
| 181 | printf("crc32(stdin) = %08lx\n", (unsigned long)crc); |
| 182 | return (0); |
| 183 | } |
| 184 | |
| 185 | #endif |
| 186 | |
| 187 | /*----- That's all, folks -------------------------------------------------*/ |