| 1 | /* XzCrc64Opt.c -- CRC64 calculation\r |
| 2 | 2015-03-01 : Igor Pavlov : Public domain */\r |
| 3 | \r |
| 4 | #include "Precomp.h"\r |
| 5 | \r |
| 6 | #include "CpuArch.h"\r |
| 7 | \r |
| 8 | #ifndef MY_CPU_BE\r |
| 9 | \r |
| 10 | #define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))\r |
| 11 | \r |
| 12 | UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table)\r |
| 13 | {\r |
| 14 | const Byte *p = (const Byte *)data;\r |
| 15 | for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)\r |
| 16 | v = CRC_UPDATE_BYTE_2(v, *p);\r |
| 17 | for (; size >= 4; size -= 4, p += 4)\r |
| 18 | {\r |
| 19 | UInt32 d = (UInt32)v ^ *(const UInt32 *)p;\r |
| 20 | v = (v >> 32)\r |
| 21 | ^ table[0x300 + ((d ) & 0xFF)]\r |
| 22 | ^ table[0x200 + ((d >> 8) & 0xFF)]\r |
| 23 | ^ table[0x100 + ((d >> 16) & 0xFF)]\r |
| 24 | ^ table[0x000 + ((d >> 24))];\r |
| 25 | }\r |
| 26 | for (; size > 0; size--, p++)\r |
| 27 | v = CRC_UPDATE_BYTE_2(v, *p);\r |
| 28 | return v;\r |
| 29 | }\r |
| 30 | \r |
| 31 | #endif\r |
| 32 | \r |
| 33 | \r |
| 34 | #ifndef MY_CPU_LE\r |
| 35 | \r |
| 36 | #define CRC_UINT64_SWAP(v) \\r |
| 37 | ((v >> 56) \\r |
| 38 | | ((v >> 40) & ((UInt64)0xFF << 8)) \\r |
| 39 | | ((v >> 24) & ((UInt64)0xFF << 16)) \\r |
| 40 | | ((v >> 8) & ((UInt64)0xFF << 24)) \\r |
| 41 | | ((v << 8) & ((UInt64)0xFF << 32)) \\r |
| 42 | | ((v << 24) & ((UInt64)0xFF << 40)) \\r |
| 43 | | ((v << 40) & ((UInt64)0xFF << 48)) \\r |
| 44 | | ((v << 56)))\r |
| 45 | \r |
| 46 | #define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(Byte)((crc) >> 56) ^ (b)] ^ ((crc) << 8))\r |
| 47 | \r |
| 48 | UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table)\r |
| 49 | {\r |
| 50 | const Byte *p = (const Byte *)data;\r |
| 51 | table += 0x100;\r |
| 52 | v = CRC_UINT64_SWAP(v);\r |
| 53 | for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)\r |
| 54 | v = CRC_UPDATE_BYTE_2_BE(v, *p);\r |
| 55 | for (; size >= 4; size -= 4, p += 4)\r |
| 56 | {\r |
| 57 | UInt32 d = (UInt32)(v >> 32) ^ *(const UInt32 *)p;\r |
| 58 | v = (v << 32)\r |
| 59 | ^ table[0x000 + ((d ) & 0xFF)]\r |
| 60 | ^ table[0x100 + ((d >> 8) & 0xFF)]\r |
| 61 | ^ table[0x200 + ((d >> 16) & 0xFF)]\r |
| 62 | ^ table[0x300 + ((d >> 24))];\r |
| 63 | }\r |
| 64 | for (; size > 0; size--, p++)\r |
| 65 | v = CRC_UPDATE_BYTE_2_BE(v, *p);\r |
| 66 | return CRC_UINT64_SWAP(v);\r |
| 67 | }\r |
| 68 | \r |
| 69 | #endif\r |