| 1 | /* XzCrc64.c -- CRC64 calculation\r |
| 2 | 2015-03-01 : Igor Pavlov : Public domain */\r |
| 3 | \r |
| 4 | #include "Precomp.h"\r |
| 5 | \r |
| 6 | #include "XzCrc64.h"\r |
| 7 | #include "CpuArch.h"\r |
| 8 | \r |
| 9 | #define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)\r |
| 10 | \r |
| 11 | #ifdef MY_CPU_LE\r |
| 12 | #define CRC_NUM_TABLES 4\r |
| 13 | #else\r |
| 14 | #define CRC_NUM_TABLES 5\r |
| 15 | #define CRC_UINT64_SWAP(v) \\r |
| 16 | ((v >> 56) \\r |
| 17 | | ((v >> 40) & ((UInt64)0xFF << 8)) \\r |
| 18 | | ((v >> 24) & ((UInt64)0xFF << 16)) \\r |
| 19 | | ((v >> 8) & ((UInt64)0xFF << 24)) \\r |
| 20 | | ((v << 8) & ((UInt64)0xFF << 32)) \\r |
| 21 | | ((v << 24) & ((UInt64)0xFF << 40)) \\r |
| 22 | | ((v << 40) & ((UInt64)0xFF << 48)) \\r |
| 23 | | ((v << 56)))\r |
| 24 | \r |
| 25 | UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table);\r |
| 26 | #endif\r |
| 27 | \r |
| 28 | #ifndef MY_CPU_BE\r |
| 29 | UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table);\r |
| 30 | #endif\r |
| 31 | \r |
| 32 | typedef UInt64 (MY_FAST_CALL *CRC_FUNC)(UInt64 v, const void *data, size_t size, const UInt64 *table);\r |
| 33 | \r |
| 34 | static CRC_FUNC g_Crc64Update;\r |
| 35 | UInt64 g_Crc64Table[256 * CRC_NUM_TABLES];\r |
| 36 | \r |
| 37 | UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)\r |
| 38 | {\r |
| 39 | return g_Crc64Update(v, data, size, g_Crc64Table);\r |
| 40 | }\r |
| 41 | \r |
| 42 | UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)\r |
| 43 | {\r |
| 44 | return g_Crc64Update(CRC64_INIT_VAL, data, size, g_Crc64Table) ^ CRC64_INIT_VAL;\r |
| 45 | }\r |
| 46 | \r |
| 47 | void MY_FAST_CALL Crc64GenerateTable()\r |
| 48 | {\r |
| 49 | UInt32 i;\r |
| 50 | for (i = 0; i < 256; i++)\r |
| 51 | {\r |
| 52 | UInt64 r = i;\r |
| 53 | unsigned j;\r |
| 54 | for (j = 0; j < 8; j++)\r |
| 55 | r = (r >> 1) ^ (kCrc64Poly & ~((r & 1) - 1));\r |
| 56 | g_Crc64Table[i] = r;\r |
| 57 | }\r |
| 58 | for (; i < 256 * CRC_NUM_TABLES; i++)\r |
| 59 | {\r |
| 60 | UInt64 r = g_Crc64Table[i - 256];\r |
| 61 | g_Crc64Table[i] = g_Crc64Table[r & 0xFF] ^ (r >> 8);\r |
| 62 | }\r |
| 63 | \r |
| 64 | #ifdef MY_CPU_LE\r |
| 65 | \r |
| 66 | g_Crc64Update = XzCrc64UpdateT4;\r |
| 67 | \r |
| 68 | #else\r |
| 69 | {\r |
| 70 | #ifndef MY_CPU_BE\r |
| 71 | UInt32 k = 1;\r |
| 72 | if (*(const Byte *)&k == 1)\r |
| 73 | g_Crc64Update = XzCrc64UpdateT4;\r |
| 74 | else\r |
| 75 | #endif\r |
| 76 | {\r |
| 77 | for (i = 256 * CRC_NUM_TABLES - 1; i >= 256; i--)\r |
| 78 | {\r |
| 79 | UInt64 x = g_Crc64Table[i - 256];\r |
| 80 | g_Crc64Table[i] = CRC_UINT64_SWAP(x);\r |
| 81 | }\r |
| 82 | g_Crc64Update = XzCrc64UpdateT1_BeT4;\r |
| 83 | }\r |
| 84 | }\r |
| 85 | #endif\r |
| 86 | }\r |