File: 7zCrc.h

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/* 7zCrc.h -- CRC32 calculation
2024-01-22 : 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 *Z7_CRC_UPDATE_FUNC)(UInt32 v, const void *data, size_t size);
Z7_CRC_UPDATE_FUNC z7_GetFunc_CrcUpdate(unsigned algo);

EXTERN_C_END

#endif