1 /*

     2 * Copyright (c) 2005 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:    

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef C_CTRANSACTIONIDGENERATOR_H

    22 #define C_CTRANSACTIONIDGENERATOR_H

    23 

    24 // INCLUDES

    25 #include <e32base.h>

    26 #include "natfwunsaftransactionid.h"

    27 

    28 // FORWARD DECLARATIONS

    29 

    30 // CLASS DECLARATION

    31 

    32 /**

    33  *  This class provides unique UNSAF TransactionID values. 

    34  */

    35 class CTransactionIDGenerator : public CBase

    36     {

    37     public: // Constructors and destructor

    38 

    39         /**

    40         * Creates a new instance of CTransactionIDGenerator.        

    41         * @return A new instance of CTransactionIDGenerator, ownership is

    42         *    transferred.

    43         */

    44         static CTransactionIDGenerator* NewL();

    45 

    46         ~CTransactionIDGenerator();

    47     

    48     public: // New functions

    49 

    50         /**

    51         * Creates a unique UNSAF TransactionID and writes it into

    52         * aTransactionID.

    53         *

    54         * @param aObject IN: Pointer to an object, whose state will be used as a

    55         *         random input for creating the UNSAF TransactionID.

    56         *         Ownership is not transferred.

    57         * @param aObjectSize Size in bytes, of the object pointed by aObject.

    58         * @param aTransactionID OUT: UNSAF TransactionID

    59         */

    60         void GetIDL( TAny* aObject,

    61                      TInt aObjectSize,

    62                      TNATFWUNSAFTransactionID& aTransactionID );

    63 

    64     private:

    65     

    66         CTransactionIDGenerator();

    67 

    68         CTransactionIDGenerator(

    69             const CTransactionIDGenerator& aTransactionIDGenerator );

    70 

    71         HBufC8* BuildInputDataLC( TAny* aObject, TInt aObjectSize );

    72         

    73         void AddClockInfo( TDes8& aBuf ) const;

    74         

    75         void AddSystemInfo( TDes8& aBuf ) const;

    76         

    77         void ComputeChecksum( TDes8& aBuf,

    78                               const TAny* aPtr,

    79                               TInt aLength ) const;

    80 

    81     private: // Data

    82 

    83         //Seed value for Math::Rand()

    84         TInt64 iSeed;

    85 

    86         TUint32 iCounter;

    87 

    88     private: // For testing purposes

    89 

    90 #ifdef TEST_EUNIT

    91         friend class CSTUNClientImplementationTest;

    92 #endif

    93         __DECLARE_TEST;

    94     };

    95 

    96 #endif // C_CTRANSACTIONIDGENERATOR_H