zlibinstream.h

vncviewer_source_1.0

/* Copyright (C) 2006 Lucas Gomez  All Rights Reserved.
 * 
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 * USA.
 */

#ifndef __ZLIBINSTREAM_H__
#define __ZLIBINSTREAM_H__

// INCLUDES
#include <e32base.h>
#include <e32std.h>
#include <EZDecompressor.h>
#include <EZBufman.h>

#include "InStream.h"

// ENUMERATIONS

// CONSTANTS
namespace ZLibConstants
{
	const TInt KDefaultBufSize=16384;
}

// CLASS DECLARATION

/**
* ZLibInStream application class.
*/
class ZLibInStream : public InStream, public MEZBufferManager
{
public: // Constructors and destructor
    /**
    * ~ZLibInStream
    * Virtual Destructor.
    */
    virtual ~ZLibInStream();

public: // Constructors

    /**
    * ZLibInStream.
    * C++ default constructor.
    */
    ZLibInStream(TInt aBufSize=ZLibConstants::KDefaultBufSize);
    
public:	// class methods
	void SetUnderlying(InStream* aIS,TInt aBytesIn);
	
	void Reset();

	TInt Pos();
	
	TInt Overrun(TInt aItemSize,TInt aNItems);
	
	void Decompress();
	
	/* From MEZBufferManager */
	void InitializeL(CEZZStream& aZStream);
	
	void NeedInputL(CEZZStream& aZStream);
	
	void NeedOutputL(CEZZStream& aZStream);
	
	void FinalizeL(CEZZStream& aZStream);
    
private:	// member variables
	InStream* iUnderlying;
	TInt iBufSize;
	TInt iPtrOffset;
	CEZDecompressor* iInflater;
	TInt iBytesIn;
};

#endif // __ZLIBINSTREAM_H__