1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/cryptoservices/filebasedcertificateandkeystores/source/shared/NullStream.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,61 @@
     1.4 +/*
     1.5 +* Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.6 +* All rights reserved.
     1.7 +* This component and the accompanying materials are made available
     1.8 +* under the terms of the License "Eclipse Public License v1.0"
     1.9 +* which accompanies this distribution, and is available
    1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.11 +*
    1.12 +* Initial Contributors:
    1.13 +* Nokia Corporation - initial contribution.
    1.14 +*
    1.15 +* Contributors:
    1.16 +*
    1.17 +* Description: 
    1.18 +*
    1.19 +*/
    1.20 +
    1.21 +
    1.22 +/**
    1.23 + @file 
    1.24 + @internalTechnology
    1.25 +*/
    1.26 + 
    1.27 +#ifndef __NullStream_h__
    1.28 +#define __NullStream_h__
    1.29 +
    1.30 +#include <s32strm.h>
    1.31 +#include <s32buf.h>
    1.32 +
    1.33 +/**
    1.34 + * Implementation of the MStreamBuf interface that throws away all data written
    1.35 + * to it.  It does not support reading.
    1.36 + */
    1.37 +
    1.38 +class TNullBuf : public MStreamBuf
    1.39 +	{
    1.40 +public:
    1.41 +	TNullBuf();
    1.42 +	TUint BytesWritten();
    1.43 +private:
    1.44 +	virtual void DoWriteL(const TAny* aPtr,TInt aLength);
    1.45 +private:
    1.46 +	TUint iBytesWritten;
    1.47 +	}; 
    1.48 +
    1.49 +/**
    1.50 + * A write stream that throws away all its input, but keeps track of how many
    1.51 + * bytes have been written to it.  It is used for determining the amount of
    1.52 + * memory needed to store externalised objects.
    1.53 + */
    1.54 +
    1.55 +class RNullWriteStream : public RWriteStream
    1.56 +	{
    1.57 +public:
    1.58 +	RNullWriteStream();
    1.59 +	TUint BytesWritten();
    1.60 +private:
    1.61 +	TNullBuf iSink;
    1.62 +	};
    1.63 +
    1.64 +#endif