CRC.h
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CRC.h
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	// Common/CRC.h

	#ifndef __COMMON_CRC_H
	#define __COMMON_CRC_H

	#include <stddef.h>
	#include "Types.h"

	class CCRC
	{
	UInt32 _value;
	public:
	static UInt32 Table[256];
	static void InitTable();

	CCRC(): _value(0xFFFFFFFF){};
	void Init() { _value = 0xFFFFFFFF; }
	void UpdateByte(Byte v);
	void UpdateUInt16(UInt16 v);
	void UpdateUInt32(UInt32 v);
	void UpdateUInt64(UInt64 v);
	void Update(const void *data, size_t size);
	UInt32 GetDigest() const { return _value ^ 0xFFFFFFFF; }
	static UInt32 CalculateDigest(const void *data, size_t size)
	{
	CCRC crc;
	crc.Update(data, size);
	return crc.GetDigest();
	}
	static bool VerifyDigest(UInt32 digest, const void *data, size_t size)
	{
	return (CalculateDigest(data, size) == digest);
	}
	};

	#endif