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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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/* XzCrc64Opt.c -- CRC64 calculation
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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)
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{
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const Byte *p = (const Byte *)data;
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2(v, *p);
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for (; size >= 4; size -= 4, p += 4)
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{
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UInt32 d = (UInt32)v ^ *(const UInt32 *)p;
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v = (v >> 32)
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^ (table + 0x300)[((d ) & 0xFF)]
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^ (table + 0x200)[((d >> 8) & 0xFF)]
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^ (table + 0x100)[((d >> 16) & 0xFF)]
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^ (table + 0x000)[((d >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2(v, *p);
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return v;
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}
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#endif
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#ifndef MY_CPU_LE
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#define CRC_UINT64_SWAP(v) \
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((v >> 56) \
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| ((v >> 40) & ((UInt64)0xFF << 8)) \
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| ((v >> 24) & ((UInt64)0xFF << 16)) \
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| ((v >> 8) & ((UInt64)0xFF << 24)) \
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| ((v << 8) & ((UInt64)0xFF << 32)) \
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| ((v << 24) & ((UInt64)0xFF << 40)) \
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| ((v << 40) & ((UInt64)0xFF << 48)) \
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| ((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)
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{
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const Byte *p = (const Byte *)data;
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table += 0x100;
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v = CRC_UINT64_SWAP(v);
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2_BE(v, *p);
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for (; size >= 4; size -= 4, p += 4)
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{
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UInt32 d = (UInt32)(v >> 32) ^ *(const UInt32 *)p;
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v = (v << 32)
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^ (table + 0x000)[((d ) & 0xFF)]
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^ (table + 0x100)[((d >> 8) & 0xFF)]
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^ (table + 0x200)[((d >> 16) & 0xFF)]
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^ (table + 0x300)[((d >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2_BE(v, *p);
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return CRC_UINT64_SWAP(v);
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}
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#endif
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