| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: crc32.c,v 1.3 1999/05/06 19:51:35 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 1.3 1999/05/06 19:51:35 mdw |
| 34 | * Reformatted the LGPL notice a little bit. |
| 35 | * |
| 36 | * Revision 1.2 1999/05/05 18:50:31 mdw |
| 37 | * Change licensing conditions to LGPL. |
| 38 | * |
| 39 | * Revision 1.1.1.1 1998/06/17 23:44:42 mdw |
| 40 | * Initial version of mLib |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | /*----- Header files ------------------------------------------------------*/ |
| 45 | |
| 46 | /* --- ANSI headers --- */ |
| 47 | |
| 48 | #include <stdio.h> |
| 49 | #include <stdlib.h> |
| 50 | #include <string.h> |
| 51 | |
| 52 | /* --- Local headers --- */ |
| 53 | |
| 54 | #include "crc32.h" |
| 55 | |
| 56 | /*----- CRC table ---------------------------------------------------------*/ |
| 57 | |
| 58 | /* --- Acknowledgements and information --- * |
| 59 | * |
| 60 | * This table was generated using a derivative of the Rocksoft Model CRC |
| 61 | * generator. The parameters given are: |
| 62 | * |
| 63 | * width = 32bits |
| 64 | * poly = 0x04C11DB7 |
| 65 | * init = -1 |
| 66 | * xorout = -1 |
| 67 | * reverse = yes |
| 68 | * check = crc(123456789) = 0xCBF43926 |
| 69 | */ |
| 70 | |
| 71 | unsigned long crc32_table[256] = { |
| 72 | 0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL, |
| 73 | 0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L, |
| 74 | 0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L, |
| 75 | 0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L, |
| 76 | 0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL, |
| 77 | 0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L, |
| 78 | 0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL, |
| 79 | 0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L, |
| 80 | 0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L, |
| 81 | 0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL, |
| 82 | 0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L, |
| 83 | 0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L, |
| 84 | 0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L, |
| 85 | 0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL, |
| 86 | 0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L, |
| 87 | 0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL, |
| 88 | 0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL, |
| 89 | 0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L, |
| 90 | 0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L, |
| 91 | 0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L, |
| 92 | 0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL, |
| 93 | 0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L, |
| 94 | 0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL, |
| 95 | 0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L, |
| 96 | 0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L, |
| 97 | 0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL, |
| 98 | 0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L, |
| 99 | 0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L, |
| 100 | 0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L, |
| 101 | 0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL, |
| 102 | 0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L, |
| 103 | 0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL, |
| 104 | 0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL, |
| 105 | 0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L, |
| 106 | 0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L, |
| 107 | 0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L, |
| 108 | 0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL, |
| 109 | 0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L, |
| 110 | 0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL, |
| 111 | 0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L, |
| 112 | 0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L, |
| 113 | 0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL, |
| 114 | 0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L, |
| 115 | 0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L, |
| 116 | 0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L, |
| 117 | 0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL, |
| 118 | 0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L, |
| 119 | 0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL, |
| 120 | 0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL, |
| 121 | 0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L, |
| 122 | 0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L, |
| 123 | 0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L, |
| 124 | 0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL, |
| 125 | 0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L, |
| 126 | 0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL, |
| 127 | 0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L, |
| 128 | 0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L, |
| 129 | 0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL, |
| 130 | 0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L, |
| 131 | 0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L, |
| 132 | 0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L, |
| 133 | 0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL, |
| 134 | 0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L, |
| 135 | 0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL, |
| 136 | }; |
| 137 | |
| 138 | /*----- Functionc provided ------------------------------------------------*/ |
| 139 | |
| 140 | /* --- @crc32@ --- * |
| 141 | * |
| 142 | * Arguments: @unsigned long crc@ = carryover from previous call, or zero |
| 143 | * @const void *buf@ = pointer to buffer to check |
| 144 | * @size_t sz@ = size of the buffer |
| 145 | * |
| 146 | * Returns: The CRC updated by the new buffer. |
| 147 | * |
| 148 | * Use: A restartable CRC calculator. This is just a function |
| 149 | * wrapper for the macro version. |
| 150 | */ |
| 151 | |
| 152 | unsigned long crc32(unsigned long crc, const void *buf, size_t sz) |
| 153 | { |
| 154 | unsigned long c; |
| 155 | CRC32(c, crc, buf, sz); |
| 156 | return (c); |
| 157 | } |
| 158 | |
| 159 | /*----- Test driver -------------------------------------------------------*/ |
| 160 | |
| 161 | #ifdef TEST_RIG |
| 162 | |
| 163 | #include <stdio.h> |
| 164 | |
| 165 | int main(void) |
| 166 | { |
| 167 | unsigned long crc = 0; |
| 168 | char buf[BUFSIZ]; |
| 169 | int r; |
| 170 | |
| 171 | do { |
| 172 | r = fread(buf, 1, sizeof(buf), stdin); |
| 173 | if (r > 0) |
| 174 | crc = crc32(crc, buf, r); |
| 175 | } while (r == sizeof(buf)); |
| 176 | |
| 177 | printf("crc32(stdin) = %08lx\n", crc); |
| 178 | return (0); |
| 179 | } |
| 180 | |
| 181 | #endif |
| 182 | |
| 183 | /*----- That's all, folks -------------------------------------------------*/ |