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/* XzCrc64Opt.c -- CRC64 calculation↩
2017-06-30 : Igor Pavlov : Public domain */↩
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#include "Precomp.h"↩
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#include "CpuArch.h"↩
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#ifndef MY_CPU_BE↩
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#define CRC64_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))↩
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UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table)↩
{↩
const Byte *p = (const Byte *)data;↩
for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)↩
v = CRC64_UPDATE_BYTE_2(v, *p);↩
for (; size >= 4; size -= 4, p += 4)↩
{↩
UInt32 d = (UInt32)v ^ *(const UInt32 *)p;↩
v = (v >> 32)↩
^ (table + 0x300)[((d ) & 0xFF)]↩
^ (table + 0x200)[((d >> 8) & 0xFF)]↩
^ (table + 0x100)[((d >> 16) & 0xFF)]↩
^ (table + 0x000)[((d >> 24))];↩
}↩
for (; size > 0; size--, p++)↩
v = CRC64_UPDATE_BYTE_2(v, *p);↩
return v;↩
}↩
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#endif↩
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#ifndef MY_CPU_LE↩
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#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)))↩
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#define CRC64_UPDATE_BYTE_2_BE(crc, b) (table[(Byte)((crc) >> 56) ^ (b)] ^ ((crc) << 8))↩
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UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table)↩
{↩
const Byte *p = (const Byte *)data;↩
table += 0x100;↩
v = CRC_UINT64_SWAP(v);↩
for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)↩
v = CRC64_UPDATE_BYTE_2_BE(v, *p);↩
for (; size >= 4; size -= 4, p += 4)↩
{↩
UInt32 d = (UInt32)(v >> 32) ^ *(const UInt32 *)p;↩
v = (v << 32)↩
^ (table + 0x000)[((d ) & 0xFF)]↩
^ (table + 0x100)[((d >> 8) & 0xFF)]↩
^ (table + 0x200)[((d >> 16) & 0xFF)]↩
^ (table + 0x300)[((d >> 24))];↩
}↩
for (; size > 0; size--, p++)↩
v = CRC64_UPDATE_BYTE_2_BE(v, *p);↩
return CRC_UINT64_SWAP(v);↩
}↩
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#endif↩