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33 lines
746 B
33 lines
746 B
/* XzCrc64.c -- CRC64 calculation
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2010-04-16 : Igor Pavlov : Public domain */
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#include "XzCrc64.h"
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#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
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UInt64 g_Crc64Table[256];
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void MY_FAST_CALL Crc64GenerateTable(void)
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{
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UInt32 i;
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for (i = 0; i < 256; i++)
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{
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UInt64 r = i;
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int j;
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for (j = 0; j < 8; j++)
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r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1));
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g_Crc64Table[i] = r;
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}
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}
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UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
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{
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const Byte *p = (const Byte *)data;
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for (; size > 0 ; size--, p++)
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v = CRC64_UPDATE_BYTE(v, *p);
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return v;
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}
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UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
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{
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return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size));
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}
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