1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/* XzCrc64.c -- CRC64 calculation
2017-05-23 : Igor Pavlov : Public domain */
#include "Precomp.h"
#include "XzCrc64.h"
#include "CpuArch.h"
#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
#ifdef MY_CPU_LE
#define CRC64_NUM_TABLES 4
#else
#define CRC64_NUM_TABLES 5
#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)))
UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
#endif
#ifndef MY_CPU_BE
UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
#endif
typedef UInt64 (MY_FAST_CALL *CRC64_FUNC)(UInt64 v, const void *data, size_t size, const UInt64 *table);
static CRC64_FUNC g_Crc64Update;
UInt64 g_Crc64Table[256 * CRC64_NUM_TABLES];
UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
{
return g_Crc64Update(v, data, size, g_Crc64Table);
}
UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
{
return g_Crc64Update(CRC64_INIT_VAL, data, size, g_Crc64Table) ^ CRC64_INIT_VAL;
}
void MY_FAST_CALL Crc64GenerateTable()
{
UInt32 i;
for (i = 0; i < 256; i++)
{
UInt64 r = i;
unsigned j;
for (j = 0; j < 8; j++)
r = (r >> 1) ^ (kCrc64Poly & ((UInt64)0 - (r & 1)));
g_Crc64Table[i] = r;
}
for (i = 256; i < 256 * CRC64_NUM_TABLES; i++)
{
UInt64 r = g_Crc64Table[(size_t)i - 256];
g_Crc64Table[i] = g_Crc64Table[r & 0xFF] ^ (r >> 8);
}
#ifdef MY_CPU_LE
g_Crc64Update = XzCrc64UpdateT4;
#else
{
#ifndef MY_CPU_BE
UInt32 k = 1;
if (*(const Byte *)&k == 1)
g_Crc64Update = XzCrc64UpdateT4;
else
#endif
{
for (i = 256 * CRC64_NUM_TABLES - 1; i >= 256; i--)
{
UInt64 x = g_Crc64Table[(size_t)i - 256];
g_Crc64Table[i] = CRC_UINT64_SWAP(x);
}
g_Crc64Update = XzCrc64UpdateT1_BeT4;
}
}
#endif
}
|
