class CPQDIF_S_Chunk : public CPQDIF_StreamIO
    {
    public:
	    CPQDIF_S_Chunk();
        virtual ~CPQDIF_S_Chunk();

    //  Attributes
    public:

    //  Operations
    public:
        bool SetInput( BYTE * chunk, long size );

        bool GetOutputSize( long& size );
        bool GetOutput( BYTE * chunk, long maxSize );

    //  Overridables
    public:
        virtual bool SeekPos( int pos );
        virtual bool GetPos( int& pos );
        virtual bool SeekEnd( void );

        virtual BYTE * ReadBlock( long size, int& actualSize );
        virtual bool WriteBlock( int &sizeActual );

    //  Implementation
    protected:
        BYTE *      m_chunkRead;
        long        m_sizeChunkRead;

        CPQByteArray    m_chunkWrite;

        long            m_posChunk;
    };