| 1 | //========================================================================== |
| 2 | // |
| 3 | // crc32.c |
| 4 | // |
| 5 | // Gary S. Brown's 32 bit CRC |
| 6 | // |
| 7 | //========================================================================== |
| 8 | //####ECOSGPLCOPYRIGHTBEGIN#### |
| 9 | // ------------------------------------------- |
| 10 | // This file is part of eCos, the Embedded Configurable Operating System. |
| 11 | // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. |
| 12 | // Copyright (C) 2002 Gary Thomas |
| 13 | // |
| 14 | // eCos is free software; you can redistribute it and/or modify it under |
| 15 | // the terms of the GNU General Public License as published by the Free |
| 16 | // Software Foundation; either version 2 or (at your option) any later version. |
| 17 | // |
| 18 | // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
| 19 | // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 20 | // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 21 | // for more details. |
| 22 | // |
| 23 | // You should have received a copy of the GNU General Public License along |
| 24 | // with eCos; if not, write to the Free Software Foundation, Inc., |
| 25 | // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 26 | // |
| 27 | // As a special exception, if other files instantiate templates or use macros |
| 28 | // or inline functions from this file, or you compile this file and link it |
| 29 | // with other works to produce a work based on this file, this file does not |
| 30 | // by itself cause the resulting work to be covered by the GNU General Public |
| 31 | // License. However the source code for this file must still be made available |
| 32 | // in accordance with section (3) of the GNU General Public License. |
| 33 | // |
| 34 | // This exception does not invalidate any other reasons why a work based on |
| 35 | // this file might be covered by the GNU General Public License. |
| 36 | // |
| 37 | // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
| 38 | // at http://sources.redhat.com/ecos/ecos-license/ |
| 39 | // ------------------------------------------- |
| 40 | //####ECOSGPLCOPYRIGHTEND#### |
| 41 | //========================================================================== |
| 42 | //#####DESCRIPTIONBEGIN#### |
| 43 | // |
| 44 | // Author(s): gthomas |
| 45 | // Contributors: gthomas,asl |
| 46 | // Date: 2001-01-31 |
| 47 | // Purpose: |
| 48 | // Description: |
| 49 | // |
| 50 | // This code is part of eCos (tm). |
| 51 | // |
| 52 | //####DESCRIPTIONEND#### |
| 53 | // |
| 54 | //========================================================================== |
| 55 | |
| 56 | #if 0 |
| 57 | #include <cyg/crc/crc.h> |
| 58 | #else |
| 59 | #include "cyg_crc.h" |
| 60 | #endif |
| 61 | |
| 62 | /* ====================================================================== */ |
| 63 | /* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or */ |
| 64 | /* code or tables extracted from it, as desired without restriction. */ |
| 65 | /* */ |
| 66 | /* First, the polynomial itself and its table of feedback terms. The */ |
| 67 | /* polynomial is */ |
| 68 | /* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */ |
| 69 | /* */ |
| 70 | /* ====================================================================== */ |
| 71 | |
| 72 | static const cyg_uint32 crc32_tab[] = { |
| 73 | 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, |
| 74 | 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, |
| 75 | 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, |
| 76 | 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, |
| 77 | 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, |
| 78 | 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, |
| 79 | 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, |
| 80 | 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, |
| 81 | 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, |
| 82 | 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, |
| 83 | 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, |
| 84 | 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, |
| 85 | 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, |
| 86 | 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, |
| 87 | 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, |
| 88 | 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, |
| 89 | 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, |
| 90 | 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, |
| 91 | 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, |
| 92 | 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, |
| 93 | 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, |
| 94 | 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, |
| 95 | 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, |
| 96 | 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, |
| 97 | 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, |
| 98 | 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, |
| 99 | 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, |
| 100 | 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, |
| 101 | 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, |
| 102 | 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, |
| 103 | 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, |
| 104 | 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, |
| 105 | 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, |
| 106 | 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, |
| 107 | 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, |
| 108 | 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, |
| 109 | 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, |
| 110 | 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, |
| 111 | 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, |
| 112 | 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, |
| 113 | 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, |
| 114 | 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, |
| 115 | 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, |
| 116 | 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, |
| 117 | 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, |
| 118 | 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, |
| 119 | 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, |
| 120 | 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, |
| 121 | 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, |
| 122 | 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, |
| 123 | 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, |
| 124 | 0x2d02ef8dL |
| 125 | }; |
| 126 | |
| 127 | /* This is the standard Gary S. Brown's 32 bit CRC algorithm, but |
| 128 | accumulate the CRC into the result of a previous CRC. */ |
| 129 | cyg_uint32 |
| 130 | cyg_crc32_accumulate(cyg_uint32 crc32val, unsigned char *s, int len) |
| 131 | { |
| 132 | int i; |
| 133 | |
| 134 | for (i = 0; i < len; i++) { |
| 135 | crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8); |
| 136 | } |
| 137 | return crc32val; |
| 138 | } |
| 139 | |
| 140 | /* This is the standard Gary S. Brown's 32 bit CRC algorithm */ |
| 141 | cyg_uint32 |
| 142 | cyg_crc32(unsigned char *s, int len) |
| 143 | { |
| 144 | return (cyg_crc32_accumulate(0,s,len)); |
| 145 | } |
| 146 | |
| 147 | /* Return a 32-bit CRC of the contents of the buffer accumulating the |
| 148 | result from a previous CRC calculation. This uses the Ethernet FCS |
| 149 | algorithm.*/ |
| 150 | cyg_uint32 |
| 151 | cyg_ether_crc32_accumulate(cyg_uint32 crc32val, unsigned char *s, int len) |
| 152 | { |
| 153 | int i; |
| 154 | |
| 155 | if (s == 0) return 0L; |
| 156 | |
| 157 | crc32val = crc32val ^ 0xffffffff; |
| 158 | for (i = 0; i < len; i++) { |
| 159 | crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8); |
| 160 | } |
| 161 | return crc32val ^ 0xffffffff; |
| 162 | } |
| 163 | |
| 164 | /* Return a 32-bit CRC of the contents of the buffer, using the |
| 165 | Ethernet FCS algorithm. */ |
| 166 | cyg_uint32 |
| 167 | cyg_ether_crc32(unsigned char *s, int len) |
| 168 | { |
| 169 | return cyg_ether_crc32_accumulate(0,s,len); |
| 170 | } |
| 171 | |
| 172 | |
| 173 | |
