1 /* XzCrc64.c -- CRC64 calculation
2 2010-04-16 : Igor Pavlov : Public domain */
3
4 #include "XzCrc64.h"
5
6 #define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
7 UInt64 g_Crc64Table[256];
8
Crc64GenerateTable(void)9 void MY_FAST_CALL Crc64GenerateTable(void)
10 {
11 UInt32 i;
12 for (i = 0; i < 256; i++)
13 {
14 UInt64 r = i;
15 int j;
16 for (j = 0; j < 8; j++)
17 r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1));
18 g_Crc64Table[i] = r;
19 }
20 }
21
Crc64Update(UInt64 v,const void * data,size_t size)22 UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
23 {
24 const Byte *p = (const Byte *)data;
25 for (; size > 0 ; size--, p++)
26 v = CRC64_UPDATE_BYTE(v, *p);
27 return v;
28 }
29
Crc64Calc(const void * data,size_t size)30 UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
31 {
32 return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size));
33 }
34