/**
 * \brief PndCRCCalculator calculates the CRC checksum from a given vector<char>
 *
 * PndCRCCalculator is based on a look-up table initially calculated from the paramters of the used CRC code.
 * The output of the calculator was cross-checked with the online CRC calculator: http://www.sunshine2k.de/coding/javascript/crc/crc_js.html
 * Both the generated look-up tables as the output match
 *
 *  \author T.Stockmanns <t.stockmanns@fz-juelich.de>
 */

#ifndef MVD_MVDOFFLINETBANALYSIS_PNDCRCCALCULATOR_H_
#define MVD_MVDOFFLINETBANALYSIS_PNDCRCCALCULATOR_H_

#include "Rtypes.h"
#include "TObject.h"

class PndCRCCalculator : public TObject {
public:
	PndCRCCalculator();
	PndCRCCalculator(UInt_t order, ULong64_t polynom, ULong64_t CRCXor, UInt_t refIn, UInt_t refOut, UInt_t CRCInit_direct);
	//settings for ToPix: fOrder(16), fPolynom(0x8005), fCRCXor(0x0000), fRefIn(0), fRefOut(0), fCRCInit_direct(0)
	//settings for PASTA: fOrder(16), fPolynom(0x1021), fCRCXor(0x0000), fRefIn(0), fRefOut(0), fCRCInit_direct(0x04FA)
	virtual ~PndCRCCalculator();

	ULong64_t CalculateCRCTableFast(std::vector<char> p, ULong64_t len);
	ULong64_t ReflectBitsStream(ULong64_t crc, int bitnum);
//	std::vector<char> ConvertData(std::vector<ULong64_t> topixFrame);
	void PrintCRCTable();


protected:
	void GenerateCRCTable();

private:
	// CRC parameters :

	const UInt_t fOrder;
	const ULong64_t fPolynom;
	const ULong64_t fCRCXor;
	const UInt_t fRefIn;
	const UInt_t fRefOut;

	ULong64_t fCRCMask;
	ULong64_t fCRCHighBit;
	ULong64_t fCRCInit_direct;
	ULong64_t fCRCTab[256];

	ClassDef(PndCRCCalculator,1);
};

#endif /* MVD_MVDOFFLINETBANALYSIS_TOPIX4_PNDHAMMINGDECODER_H_ */