XzCrc64.c
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XzCrc64.c
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	/* XzCrc64.c -- CRC64 calculation
	2010-04-16 : Igor Pavlov : Public domain */

	#include "XzCrc64.h"

	#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
	UInt64 g_Crc64Table[256];

	void MY_FAST_CALL Crc64GenerateTable(void)
	{
	UInt32 i;
	for (i = 0; i < 256; i++)
	{
	UInt64 r = i;
	int j;
	for (j = 0; j < 8; j++)
	r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1));
	g_Crc64Table[i] = r;
	}
	}

	UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
	{
	const Byte p = (const Byte )data;
	for (; size > 0 ; size--, p++)
	v = CRC64_UPDATE_BYTE(v, *p);
	return v;
	}

	UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
	{
	return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size));
	}