// 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

 @prototype

*/

#ifndef XMLENGCGZIPFILEOUTPUTSTREAM_H

#define XMLENGCGZIPFILEOUTPUTSTREAM_H

#include <xml/dom/xmlengoutputstream.h>

#include <ezbufman.h>   //MEZBufferManager

#include <ezgzip.h>     //TEZGZipHeader

class CEZCompressor;

class CXmlEngGZIPFileOutputStream : public CBase, public MXmlEngOutputStream, 

                                    public MEZBufferManager

{

public:

    static CXmlEngGZIPFileOutputStream* NewLC(RFile& aOutputFile, RFs& aRFs);

    static CXmlEngGZIPFileOutputStream* NewL(RFile& aOutputFile, RFs& aRFs);

    ~CXmlEngGZIPFileOutputStream();

    TInt CheckError();

    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:

    CXmlEngGZIPFileOutputStream(RFile& aOutputFile, RFs& aRFs);

    void ConstructL();

private:

    void WriteL(const TDesC8& aBuffer);

    void CloseL();

private:

    TInt iError;

    /**

     * Default input buffers size.

     */

    static const TInt KDefaultInputBufferSize;

    /**

     * 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;

    RBuf8 iOutputDescriptor;

    RBuf8 iInputDescriptor;

    RBuf8 iOldInputDescriptor;

    /**

     * Engine of GZiping

     */

    CEZCompressor* iCompressor;

    TInt32 iCrc;

    TEZGZipHeader iHeader;

    TInt iUncompressedDataSize;

    RFile iOutputFile;

    RFs   iRFs;

    /**

     * State of the object.

     */

    TBool iNoInputNeeded;

    TBool iKeepGoing;

    TBool iCloseInvoked;

}; 

#endif /* XMLENGCGZIPFILEOUTPUTSTREAM_H */