1 /* 7zCrc.h -- CRC32 calculation
2 2013-01-18 : Igor Pavlov : Public domain */
3 
4 #ifndef __7Z_CRC_H
5 #define __7Z_CRC_H
6 
7 #include "7zTypes.h"
8 
9 EXTERN_C_BEGIN
10 
11 extern UInt32 g_CrcTable[];
12 
13 /* Call CrcGenerateTable one time before other CRC functions */
14 void MY_FAST_CALL CrcGenerateTable(void);
15 
16 #define CRC_INIT_VAL 0xFFFFFFFF
17 #define CRC_GET_DIGEST(crc) ((crc) ^ CRC_INIT_VAL)
18 #define CRC_UPDATE_BYTE(crc, b) (g_CrcTable[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
19 
20 UInt32 MY_FAST_CALL CrcUpdate(UInt32 crc, const void *data, size_t size);
21 UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size);
22 
23 EXTERN_C_END
24 
25 #endif
26