1 /*

     2 * Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:   The header file of DevTokenNullStream

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef __DEVTOKENNULLSTREAM_H__

    21 #define __DEVTOKENNULLSTREAM_H__

    22 

    23 #include <s32strm.h>

    24 #include <s32buf.h>

    25 

    26 /**

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

    28  * to it.  It does not support reading

    29  *

    30  *  @lib DevTokenShared.dll

    31  *  @since S60 v3.2.

    32  */

    33 class TNullBuf : public MStreamBuf

    34     {

    35     public:

    36     

    37         TNullBuf();

    38     

    39         TUint BytesWritten();

    40         

    41     private:

    42     

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

    44         

    45     private:

    46     

    47         TUint iBytesWritten;

    48     }; 

    49 

    50 

    51 /**

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

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

    54  * memory needed to store externalised objects.

    55  * 

    56  *  @lib DevTokenShared.dll

    57  *  @since S60 v3.2.

    58  */

    59 class RNullWriteStream : public RWriteStream

    60     {

    61     public:

    62         RNullWriteStream();

    63         TUint BytesWritten();

    64     

    65     private:

    66         TNullBuf iSink;

    67     };

    68 

    69 #endif //__DEVTOKENNULLSTREAM_H__

    70 

    71 //EOF

    72