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 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 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 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
