/*

* Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

*

*/

/**

 @file 

 @internalTechnology

*/

#ifndef __NullStream_h__

#define __NullStream_h__

#include <s32strm.h>

#include <s32buf.h>

/**

 * Implementation of the MStreamBuf interface that throws away all data written

 * to it.  It does not support reading.

 */

class TNullBuf : public MStreamBuf

	{

public:

	TNullBuf();

	TUint BytesWritten();

private:

	virtual void DoWriteL(const TAny* aPtr,TInt aLength);

private:

	TUint iBytesWritten;

	}; 

/**

 * A write stream that throws away all its input, but keeps track of how many

 * bytes have been written to it.  It is used for determining the amount of

 * memory needed to store externalised objects.

 */

class RNullWriteStream : public RWriteStream

	{

public:

	RNullWriteStream();

	TUint BytesWritten();

private:

	TNullBuf iSink;

	};

#endif