--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptoservices/filebasedcertificateandkeystores/source/shared/NullStream.h	Wed Jul 08 11:25:26 2009 +0100
@@ -0,0 +1,63 @@
+/*
+* 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