csgo/cstrike15_src/public/tier1/checksum_crc.h

//========= Copyright � 1996-2005, Valve Corporation, All rights reserved. ============//
//
// Purpose: Generic CRC functions
//
// $NoKeywords: $
//=============================================================================//
#ifndef CHECKSUM_CRC_H
#define CHECKSUM_CRC_H
#include <tier0/platform.h>
#ifdef _WIN32
#pragma once
#endif

typedef uint32 CRC32_t;

void CRC32_Init( CRC32_t *pulCRC );
void CRC32_ProcessBuffer( CRC32_t *pulCRC, const void *p, int len );
void CRC32_Final( CRC32_t *pulCRC );
CRC32_t	CRC32_GetTableEntry( unsigned int slot );

inline CRC32_t CRC32_ProcessSingleBuffer( const void *p, int len )
{
	CRC32_t crc;

	CRC32_Init( &crc );
	CRC32_ProcessBuffer( &crc, p, len );
	CRC32_Final( &crc );

	return crc;
}

inline unsigned long CRC32_ConvertToUnsignedLong( CRC32_t *pulCRC  )
{
	return (unsigned long)(*pulCRC);
}


inline CRC32_t CRC32_ConvertFromUnsignedLong( unsigned long ulCRC  )
{
	return (CRC32_t)(ulCRC);
}

typedef uint64 CRC64_t;
void CRC64_Init( CRC64_t *pCRC );
void CRC64_ProcessBuffer( CRC64_t *pCRC, const void *p, int len );
void CRC64_Final( CRC64_t *pCRC );

inline CRC64_t CRC64_ProcessSingleBuffer( const void *p, int len )
{
	CRC64_t crc;

	CRC64_Init( &crc );
	CRC64_ProcessBuffer( &crc, p, len );
	CRC64_Final( &crc );

	return crc;
}

#endif // CHECKSUM_CRC_H