/*

 * 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