| /* XzCrc64Opt.c -- CRC64 calculation |
| 2015-03-01 : Igor Pavlov : Public domain */ |
| |
| #include "Precomp.h" |
| |
| #include "CpuArch.h" |
| |
| #ifndef MY_CPU_BE |
| |
| #define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8)) |
| |
| 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 = CRC_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 = CRC_UPDATE_BYTE_2(v, *p); |
| return v; |
| } |
| |
| #endif |
| |
| |
| #ifndef MY_CPU_LE |
| |
| #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))) |
| |
| #define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(Byte)((crc) >> 56) ^ (b)] ^ ((crc) << 8)) |
| |
| 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 = CRC_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 = CRC_UPDATE_BYTE_2_BE(v, *p); |
| return CRC_UINT64_SWAP(v); |
| } |
| |
| #endif |