| /* XzCrc64.c -- CRC64 calculation |
| 2010-04-16 : Igor Pavlov : Public domain */ |
| |
| #include "XzCrc64.h" |
| |
| #define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42) |
| UInt64 g_Crc64Table[256]; |
| |
| void MY_FAST_CALL Crc64GenerateTable(void) |
| { |
| UInt32 i; |
| for (i = 0; i < 256; i++) |
| { |
| UInt64 r = i; |
| int j; |
| for (j = 0; j < 8; j++) |
| r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1)); |
| g_Crc64Table[i] = r; |
| } |
| } |
| |
| UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size) |
| { |
| const Byte *p = (const Byte *)data; |
| for (; size > 0 ; size--, p++) |
| v = CRC64_UPDATE_BYTE(v, *p); |
| return v; |
| } |
| |
| UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size) |
| { |
| return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size)); |
| } |