5 #define kCrcPoly 0xEDB88320
6 #define CRC_NUM_TABLES 8
8 UInt32 g_CrcTable[256 * CRC_NUM_TABLES];
10 void MY_FAST_CALL CrcGenerateTable()
13 for (i = 0; i < 256; i++)
17 for (j = 0; j < 8; j++)
18 r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
21 #if CRC_NUM_TABLES > 1
22 for (; i < 256 * CRC_NUM_TABLES; i++)
24 UInt32 r = g_CrcTable[i - 256];
25 g_CrcTable[i] = g_CrcTable[r & 0xFF] ^ (r >> 8);
30 UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table);
32 UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
34 return CrcUpdateT8(v, data, size, g_CrcTable);
37 UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size)
39 return CrcUpdateT8(CRC_INIT_VAL, data, size, g_CrcTable) ^ 0xFFFFFFFF;