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  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.