haiku.git

#ifndef APE_UNBITARRAY_H
#define APE_UNBITARRAY_H


#include "UnBitArrayBase.h"


class IAPEDecompress;


struct RANGE_CODER_STRUCT_DECOMPRESS
{
	unsigned int low;       // low end of interval
	unsigned int range;     // length of interval
	unsigned int buffer;    // buffer for input/output
};


class CUnBitArray : public CUnBitArrayBase
{
public:
					CUnBitArray(CIO* pIO, int nVersion);
					~CUnBitArray();

			uint	DecodeValue(DECODE_VALUE_METHOD DecodeMethod,
						int nParam1 = 0, int nParam2 = 0);
    
			void	GenerateArray(int * pOutputArray, int nElements,
						int nBytesRequired = -1);

			int		DecodeValueRange(UNBIT_ARRAY_STATE & BitArrayState);

			void	FlushState(UNBIT_ARRAY_STATE & BitArrayState);
			void	FlushBitArray();
			void	Finalize();

private:
			void	GenerateArrayRange(int * pOutputArray, int nElements);

			// data 
			int		m_nFlushCounter;
			int		m_nFinalizeCounter;

			RANGE_CODER_STRUCT_DECOMPRESS	m_RangeCoderInfo;

			uint32	m_nRefillBitThreshold;

	// functions
	inline 	int		RangeDecodeFast(int nShift);
	inline	int		RangeDecodeFastWithUpdate(int nShift);
	inline	uchar	GetC();
};


#endif // #ifndef APE_UNBITARRAY_H