ce188d4d |
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 |