1 /* XzCrc64.c -- CRC64 calculation
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2 2015-03-01 : Igor Pavlov : Public domain */
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9 #define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
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12 #define CRC_NUM_TABLES 4
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14 #define CRC_NUM_TABLES 5
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15 #define CRC_UINT64_SWAP(v) \
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17 | ((v >> 40) & ((UInt64)0xFF << 8)) \
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18 | ((v >> 24) & ((UInt64)0xFF << 16)) \
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19 | ((v >> 8) & ((UInt64)0xFF << 24)) \
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20 | ((v << 8) & ((UInt64)0xFF << 32)) \
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21 | ((v << 24) & ((UInt64)0xFF << 40)) \
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22 | ((v << 40) & ((UInt64)0xFF << 48)) \
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25 UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
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29 UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
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32 typedef UInt64 (MY_FAST_CALL *CRC_FUNC)(UInt64 v, const void *data, size_t size, const UInt64 *table);
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34 static CRC_FUNC g_Crc64Update;
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35 UInt64 g_Crc64Table[256 * CRC_NUM_TABLES];
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37 UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
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39 return g_Crc64Update(v, data, size, g_Crc64Table);
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42 UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
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44 return g_Crc64Update(CRC64_INIT_VAL, data, size, g_Crc64Table) ^ CRC64_INIT_VAL;
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47 void MY_FAST_CALL Crc64GenerateTable()
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50 for (i = 0; i < 256; i++)
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54 for (j = 0; j < 8; j++)
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55 r = (r >> 1) ^ (kCrc64Poly & ~((r & 1) - 1));
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56 g_Crc64Table[i] = r;
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58 for (; i < 256 * CRC_NUM_TABLES; i++)
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60 UInt64 r = g_Crc64Table[i - 256];
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61 g_Crc64Table[i] = g_Crc64Table[r & 0xFF] ^ (r >> 8);
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66 g_Crc64Update = XzCrc64UpdateT4;
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72 if (*(const Byte *)&k == 1)
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73 g_Crc64Update = XzCrc64UpdateT4;
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77 for (i = 256 * CRC_NUM_TABLES - 1; i >= 256; i--)
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79 UInt64 x = g_Crc64Table[i - 256];
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80 g_Crc64Table[i] = CRC_UINT64_SWAP(x);
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82 g_Crc64Update = XzCrc64UpdateT1_BeT4;
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