arithmeticcoder.h

有关几个数字编码的C++ 程序

// ArithmeticCoder.h: interface for the CArithmeticCoder class.
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_ARITHMETICCODER_H__DB9BDBC0_E10E_4397_8D52_615FA191BDF3__INCLUDED_)
#define AFX_ARITHMETICCODER_H__DB9BDBC0_E10E_4397_8D52_615FA191BDF3__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000 
/////////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include "BitIO.h"
#include "Model.h"	// Added by ClassView

#define Code_value_bits 16                        // number of bits in a code value
typedef long code_value;                          // type of an arithmetic code value
#define top_value (((long)1<<Code_value_bits)-1)  // largest codevalue

// half and quarter points int he code value range
#define first_qtr	(top_value/4+1)
#define half		(2*first_qtr)
#define third_qtr	(3*first_qtr)

class CArithmeticCoder  
{
public:
	void SetInputFileName(char*filein);
	void Decode( );
	void SetOutputFileName(char* outfilename);
	bool Attach(CBitIO *pBitIO);
	bool Attach(CModel *);
	FILE* fileout;
	FILE* filein;
	char *name_fileout;
	char *name_filein;
	void Encode();
	CModel *m_pModel;
	CBitIO *m_pBitIO;
	//---------------------------------------------------------------
	//--------------- current state of the coding--------------------
	code_value low, high, value;
	long bits_to_follow;
	void bit_plus_follow(int bit);
	//================================================================

	CArithmeticCoder();
	virtual ~CArithmeticCoder();

	//----------------------------------------------------------------
	void start_encoding();
	void encode_symbol(int symbol, int cum_freq[]);
	void done_encoding();
	//=================================================================

	//-----------------------------------------------------------------
	//----------------functions for decoding---------------------------
	void start_decoding();
	int decode_symbol(int cum_freq[]);
	//=================================================================

};
/////////////////////////////////////////////////////////////////////////////////
#endif // !defined(AFX_ARITHMETICCODER_H__DB9BDBC0_E10E_4397_8D52_615FA191BDF3__INCLUDED_)