other-licenses/7zstub/src/C/7zCrc.h

   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