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| Rev | Author | Line No. | Line |
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| 26 | pmbaty | 1 | /* ucl_crc.c -- crc checksum for the the UCL library |
| 2 | |||
| 3 | This file is part of the UCL data compression library. |
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| 4 | |||
| 5 | Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer |
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| 6 | All Rights Reserved. |
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| 7 | |||
| 8 | The UCL library is free software; you can redistribute it and/or |
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| 9 | modify it under the terms of the GNU General Public License as |
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| 10 | published by the Free Software Foundation; either version 2 of |
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| 11 | the License, or (at your option) any later version. |
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| 12 | |||
| 13 | The UCL library is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |||
| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with the UCL library; see the file COPYING. |
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| 20 | If not, write to the Free Software Foundation, Inc., |
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| 21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 22 | |||
| 23 | Markus F.X.J. Oberhumer |
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| 24 | <markus@oberhumer.com> |
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| 25 | http://www.oberhumer.com/opensource/ucl/ |
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| 26 | */ |
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| 27 | |||
| 28 | |||
| 29 | #include "ucl_conf.h" |
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| 30 | |||
| 31 | |||
| 32 | /*********************************************************************** |
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| 33 | // crc32 checksum |
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| 34 | // adapted from free code by Mark Adler <madler@alumni.caltech.edu> |
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| 35 | // see http://www.cdrom.com/pub/infozip/zlib/ |
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| 36 | ************************************************************************/ |
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| 37 | |||
| 38 | static const ucl_uint32 __ucl_crc32_table[256] = { |
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| 39 | 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, |
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| 40 | 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, |
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| 41 | 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, |
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| 42 | 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, |
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| 43 | 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, |
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| 44 | 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, |
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| 45 | 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, |
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| 46 | 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, |
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| 47 | 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, |
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| 48 | 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, |
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| 49 | 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, |
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| 50 | 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, |
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| 51 | 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, |
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| 52 | 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, |
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| 53 | 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, |
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| 54 | 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, |
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| 55 | 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, |
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| 56 | 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, |
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| 57 | 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, |
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| 58 | 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, |
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| 59 | 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, |
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| 60 | 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, |
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| 61 | 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, |
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| 62 | 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, |
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| 63 | 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, |
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| 64 | 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, |
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| 65 | 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, |
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| 66 | 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, |
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| 67 | 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, |
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| 68 | 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, |
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| 69 | 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, |
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| 70 | 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, |
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| 71 | 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, |
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| 72 | 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, |
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| 73 | 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, |
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| 74 | 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, |
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| 75 | 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, |
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| 76 | 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, |
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| 77 | 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, |
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| 78 | 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, |
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| 79 | 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, |
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| 80 | 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, |
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| 81 | 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, |
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| 82 | 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, |
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| 83 | 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, |
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| 84 | 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, |
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| 85 | 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, |
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| 86 | 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, |
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| 87 | 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, |
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| 88 | 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, |
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| 89 | 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, |
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| 90 | 0x2d02ef8dL |
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| 91 | }; |
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| 92 | |||
| 93 | |||
| 94 | UCL_PUBLIC(const ucl_uint32p) |
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| 95 | ucl_get_crc32_table(void) |
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| 96 | { |
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| 97 | return __ucl_crc32_table; |
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| 98 | } |
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| 99 | |||
| 100 | |||
| 101 | #if 1 |
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| 102 | #define UCL_DO1(buf,i) \ |
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| 103 | crc = table[((int)crc ^ buf[i]) & 0xff] ^ (crc >> 8) |
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| 104 | #else |
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| 105 | #define UCL_DO1(buf,i) \ |
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| 106 | crc = table[(unsigned char)((unsigned char)crc ^ buf[i])] ^ (crc >> 8) |
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| 107 | #endif |
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| 108 | #define UCL_DO2(buf,i) UCL_DO1(buf,i); UCL_DO1(buf,i+1); |
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| 109 | #define UCL_DO4(buf,i) UCL_DO2(buf,i); UCL_DO2(buf,i+2); |
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| 110 | #define UCL_DO8(buf,i) UCL_DO4(buf,i); UCL_DO4(buf,i+4); |
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| 111 | #define UCL_DO16(buf,i) UCL_DO8(buf,i); UCL_DO8(buf,i+8); |
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| 112 | |||
| 113 | |||
| 114 | UCL_PUBLIC(ucl_uint32) |
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| 115 | ucl_crc32(ucl_uint32 c, const ucl_bytep buf, ucl_uint len) |
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| 116 | { |
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| 117 | ucl_uint32 crc; |
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| 118 | #undef table |
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| 119 | #if 1 |
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| 120 | # define table __ucl_crc32_table |
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| 121 | #else |
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| 122 | const ucl_uint32 * table = __ucl_crc32_table; |
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| 123 | #endif |
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| 124 | |||
| 125 | if (buf == NULL) |
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| 126 | return 0; |
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| 127 | |||
| 128 | crc = (c & UCL_UINT32_C(0xffffffff)) ^ UCL_UINT32_C(0xffffffff); |
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| 129 | if (len >= 16) do |
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| 130 | { |
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| 131 | UCL_DO16(buf,0); |
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| 132 | buf += 16; |
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| 133 | len -= 16; |
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| 134 | } while (len >= 16); |
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| 135 | if (len != 0) do |
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| 136 | { |
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| 137 | UCL_DO1(buf,0); |
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| 138 | buf += 1; |
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| 139 | len -= 1; |
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| 140 | } while (len > 0); |
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| 141 | |||
| 142 | return crc ^ UCL_UINT32_C(0xffffffff); |
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| 143 | #undef table |
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| 144 | } |
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| 145 | |||
| 146 | |||
| 147 | /* |
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| 148 | vi:ts=4:et |
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| 149 | */ |