src/util/crc32.c

   1 /**************************************************************************
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  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 }