7zCrc.h

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/* 7zCrc.h -- CRC32 calculation
2023-04-02 : Igor Pavlov : Public domain */
 
#ifndef ZIP7_INC_7Z_CRC_H
#define ZIP7_INC_7Z_CRC_H
 
#include "7zTypes.h"
 
EXTERN_C_BEGIN
 
extern UInt32 g_CrcTable[];
 
/* Call CrcGenerateTable one time before other CRC functions */
void Z7_FASTCALL CrcGenerateTable(void);
 
#define CRC_INIT_VAL 0xFFFFFFFF
#define CRC_GET_DIGEST(crc) ((crc) ^ CRC_INIT_VAL)
#define CRC_UPDATE_BYTE(crc, b) (g_CrcTable[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
 
UInt32 Z7_FASTCALL CrcUpdate(UInt32 crc, const void *data, size_t size);
UInt32 Z7_FASTCALL CrcCalc(const void *data, size_t size);
 
typedef UInt32 (Z7_FASTCALL *CRC_FUNC)(UInt32 v, const void *data, size_t size, const UInt32 *table);
 
EXTERN_C_END
 
#endif