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/* XzCrc64.c -- CRC64 calculation↩
2017-05-23 : Igor Pavlov : Public domain */↩
↩
#include "Precomp.h"↩
↩
#include "XzCrc64.h"↩
#include "CpuArch.h"↩
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#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)↩
↩
#ifdef MY_CPU_LE↩
#define CRC64_NUM_TABLES 4↩
#else↩
#define CRC64_NUM_TABLES 5↩
#define CRC_UINT64_SWAP(v) \↩
((v >> 56) \↩
| ((v >> 40) & ((UInt64)0xFF << 8)) \↩
| ((v >> 24) & ((UInt64)0xFF << 16)) \↩
| ((v >> 8) & ((UInt64)0xFF << 24)) \↩
| ((v << 8) & ((UInt64)0xFF << 32)) \↩
| ((v << 24) & ((UInt64)0xFF << 40)) \↩
| ((v << 40) & ((UInt64)0xFF << 48)) \↩
| ((v << 56)))↩
↩
UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table);↩
#endif↩
↩
#ifndef MY_CPU_BE↩
UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table);↩
#endif↩
↩
typedef UInt64 (MY_FAST_CALL *CRC64_FUNC)(UInt64 v, const void *data, size_t size, const UInt64 *table);↩
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static CRC64_FUNC g_Crc64Update;↩
UInt64 g_Crc64Table[256 * CRC64_NUM_TABLES];↩
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UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)↩
{↩
return g_Crc64Update(v, data, size, g_Crc64Table);↩
}↩
↩
UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)↩
{↩
return g_Crc64Update(CRC64_INIT_VAL, data, size, g_Crc64Table) ^ CRC64_INIT_VAL;↩
}↩
↩
void MY_FAST_CALL Crc64GenerateTable()↩
{↩
UInt32 i;↩
for (i = 0; i < 256; i++)↩
{↩
UInt64 r = i;↩
unsigned j;↩
for (j = 0; j < 8; j++)↩
r = (r >> 1) ^ (kCrc64Poly & ((UInt64)0 - (r & 1)));↩
g_Crc64Table[i] = r;↩
}↩
for (i = 256; i < 256 * CRC64_NUM_TABLES; i++)↩
{↩
UInt64 r = g_Crc64Table[(size_t)i - 256];↩
g_Crc64Table[i] = g_Crc64Table[r & 0xFF] ^ (r >> 8);↩
}↩
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#ifdef MY_CPU_LE↩
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g_Crc64Update = XzCrc64UpdateT4;↩
↩
#else↩
{↩
#ifndef MY_CPU_BE↩
UInt32 k = 1;↩
if (*(const Byte *)&k == 1)↩
g_Crc64Update = XzCrc64UpdateT4;↩
else↩
#endif↩
{↩
for (i = 256 * CRC64_NUM_TABLES - 1; i >= 256; i--)↩
{↩
UInt64 x = g_Crc64Table[(size_t)i - 256];↩
g_Crc64Table[i] = CRC_UINT64_SWAP(x);↩
}↩
g_Crc64Update = XzCrc64UpdateT1_BeT4;↩
}↩
}↩
#endif↩
}↩