// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Interface class describing class that may be used as

// output stream for dom tree

//

/**

 @file

 @internalComponent

 @released

*/

#ifndef XMLENGCGZIPBUFFEROUTPUTSTREAM_H

#define XMLENGCGZIPBUFFEROUTPUTSTREAM_H

#include <xml/dom/xmlengoutputstream.h>

#include <ezbufman.h>   //MEZBufferManager

#include <ezgzip.h>     //TEZGZipHeader

class CEZCompressor;

class CXmlEngGZIPBufferOutputStream : public CBase, public MXmlEngOutputStream, public MEZBufferManager

	{

	public:

        static CXmlEngGZIPBufferOutputStream* NewLC(RBuf8& aOutputBuffer);

        static CXmlEngGZIPBufferOutputStream* NewL(RBuf8& aOutputBuffer);

	    ~CXmlEngGZIPBufferOutputStream();

	    /**

	     * Get last error

	     */

		TInt CheckError();

        /**

         * Implementation of MXmlEngOutputStream interface.

         */

	    TInt Write( const TDesC8& aBuffer );

		TInt Close();

        /**

         * Implementation of MEZBufferManager interface.

         */

	    void InitializeL(CEZZStream& aZStream);

	    void NeedInputL(CEZZStream& aZStream);

	    void NeedOutputL(CEZZStream& aZStream);

	    void FinalizeL(CEZZStream& aZStream);

    protected:

	    CXmlEngGZIPBufferOutputStream(RBuf8& aOutputBuffer);

	    void ConstructL();

    private:

        void WriteL(const TDesC8& aBuffer);

		void CloseL();

	private:

	    /**

	     * Last error

	     */

	    TInt iError;

	    /**

	     * Default input buffers size.

	     */

	    static const TInt KDefaultInputBufferSize = 4096;

	    /**

	     * Output buffer size. It determines, how often output data will be written

	     * to disk. (it's written to disk, when buffer is full.

	     *

	     */   

	    static const TInt KOutputBufferSize = 0x8000;

	    RBuf8 iOutputDescriptor;

	    RBuf8 iInputDescriptor;

	    RBuf8 iOldInputDescriptor;

	    /**

	     * Engine of GZiping

	     */

	    CEZCompressor* iCompressor;

	    RBuf8& iOutputString;

        /**

         * State of the object.

         */	    

	    TBool iNoInputNeeded;

	    TBool iKeepGoing;

	    TBool iCloseInvoked;

	}; 

#endif /* XMLENGCGZIPBUFFEROUTPUTSTREAM_H */