80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
// File name: $Workfile: str_base.h $
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// Last modified: $Modtime: 9/20/00 11:42a $
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// Last modified by: $Author: Bill $
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//
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// VCS archive path: $Archive: /Hank/DMM/FirmWare/Level3/ObDatMgr/str_base.h $
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// VCS revision: $Revision: 6 $
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// External interfaces
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class CPQDIF_StreamProcessor;
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class CPQDIF_StreamIO
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{
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public:
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CPQDIF_StreamIO();
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virtual ~CPQDIF_StreamIO();
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// Attributes
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public:
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// Operations
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public:
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virtual bool SeekPos( int pos ) = 0;
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virtual bool GetPos( int& pos ) = 0;
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virtual bool SeekEnd( void ) = 0;
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virtual BYTE * ReadBlock( long size, int& actualSize ) = 0;
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virtual bool CanWriteFull( void ) const { return m_canWriteFull; }
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virtual bool CanWriteIncremental( void ) const { return m_canWriteInc; }
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virtual bool BeginBlock( void );
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virtual bool AppendBlock( BYTE * buffer, long size );
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virtual bool WriteBlock( int &sizeActual ) = 0;
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virtual void Flush( void ) {} // Optional (default behavior: nothing)
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virtual bool ConnectProcessor( CPQDIF_StreamProcessor * proc );
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virtual long GetChecksum( void );
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virtual void ResetChecksum( void );
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// Called by the processor
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// =======================
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// Dereferences data buffered in the stream for the processor to read.
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// The number of bytes available is returned in sizeActual. If max is 0,
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// the total remaining length of the input buffer is returned.
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// Returns FALSE when at end of buffer, TRUE otherwise.
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virtual bool ProcessRead ( const BYTE * &buffer, long max, long& sizeActual );
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// Reserves storage in the stream for the processor to write
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// data into.
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virtual bool ProcessWriteReserve( BYTE * &buffer, long size );
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// This function is set the actual size of the buffer reserved
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// by preceeding ProceWriteReserve call.
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virtual bool ProcessWriteRelease( long sizeActual );
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// Implementation
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protected:
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virtual bool ExecuteProcessorEncode( void );
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virtual bool ExecuteProcessorDecode( void );
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// Member data
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protected:
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// This is connected to the object, but not owned by it.
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CPQDIF_StreamProcessor * m_processor;
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// These are owned by the stream object
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bool m_canWriteFull;
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bool m_canWriteInc;
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CPQByteArray m_buffRead;
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long m_sizeRead;
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long m_posRead;
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CPQByteArray m_buffWrite;
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long m_sizeWrite;
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long m_posWrite;
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};
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