1 /************************************************************************** 2 * 3 * Copyright 2008 VMware, Inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 /** 29 * @file 30 * CRC32 implementation. 31 * 32 * @author Jose Fonseca 33 */ 34 35 36 #ifdef HAVE_ZLIB 37 #include <zlib.h> 38 #endif 39 #include "crc32.h" 40 41 42 static const uint32_t 43 util_crc32_table[256] = { 44 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 45 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 46 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 47 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 48 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 49 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 50 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 51 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 52 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 53 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 54 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 55 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 56 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 57 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 58 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 59 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 60 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 61 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 62 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 63 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 64 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 65 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 66 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 67 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 68 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 69 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 70 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 71 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 72 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 73 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 74 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 75 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 76 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 77 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 78 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 79 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 80 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 81 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 82 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 83 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 84 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 85 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 86 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 87 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 88 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 89 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 90 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 91 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 92 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 93 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 94 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 95 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 96 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 97 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 98 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 99 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 100 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 101 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 102 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 103 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 104 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 105 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 106 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 107 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d 108 }; 109 110 111 /** 112 * @sa http://www.w3.org/TR/PNG/#D-CRCAppendix 113 */ 114 uint32_t 115 util_hash_crc32(const void *data, size_t size) 116 { 117 const uint8_t *p = data; 118 uint32_t crc = 0xffffffff; 119 120 #ifdef HAVE_ZLIB 121 /* Prefer zlib's implementation for better performance. 122 * zlib's uInt is always "unsigned int" while size_t can be 64bit. 123 * Since 1.2.9 there's crc32_z that takes size_t, but use the more 124 * available function to avoid build system complications. 125 */ 126 if ((uInt)size == size) 127 return ~crc32(0, data, size); 128 #endif 129 130 while (size--) 131 crc = util_crc32_table[(crc ^ *p++) & 0xff] ^ (crc >> 8); 132 133 return crc; 134 } 135
