/*

* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:    SRTP packet class (RTCP)

*

*/

#ifndef __SRTP_PACKET_RTCP_H__

#define __SRTP_PACKET_RTCP_H__

// INCLUDES

#include <in_sock.h>

#include "srtppacket.h"

// FORWARD DECLARATIONS

class CSRTPCryptoHandler;

/**

* Contains general RTCP-specific packet routines

*/

class CSRTPPacketRTCP : public CSRTPPacket

    {

    public:

    	static CSRTPPacketRTCP* NewL(const TDesC8& aPacket,

                      CSRTPCryptoHandler& aHandler);

        /**

        * Create encrypted packet.

        * @param aEncryptedPayloadPtr  encrypted payload to be copied

        * @leave KErrNone if success, system-wide error code otherwise        

        * @return HBufC8* encrypted packet

        */                              

        HBufC8* CreateEncryptedPacketL(TUint8* aEncryptedPayloadPtr);

        /**

        * virtual function for creating decrypted packet.

        * @param aDecryptedPayloadPtr  decrypted payload to be copied

        * @leave KErrNone if success, system-wide error code otherwise        

        * @return HBufC8* decrypted packet

        * implemented in CSRTPPacketSRTCP.

        */                              

        virtual HBufC8* CreateDecryptedPacketL(TUint8* aDecryptedPayloadPtr);

        /**

        * virtual function for getting the authentication tag

        * implemented in CSRTPPacketSRTCP.

        */                                      

        virtual TPtrC8 AuthenticationTag();

        /**

        * virtual function for getting the master key identifier

        * implemented in CSRTPPacketSRTP.

        */                              

        virtual TPtrC8 MasterKeyIdentifier();

        /**

        * Get packet index.

        * @return TUint64 packet index.

        */                              

        TUint64 PacketIndex();

       /**

        * Set packet index.

        * @param aPacketIndex  new packet index

        * @return void

        */                              

        void SetPacketIndex(TUint64 aPacketIndex);

		/*

        * Update header length member

        * @leave KErrNone if success, system-wide error code otherwise        

        * @return void

        */

        void UpdateHeaderLengthL();        

    protected: //methods        

        CSRTPPacketRTCP (const TDesC8& aPacket,

                      CSRTPCryptoHandler& aHandler);

        ~CSRTPPacketRTCP(); 

        /**

        * Update payload length information

        * @return void

        */                              

        void UpdatePayloadLength();

        void ConstructL();     

    private: //methods

       /**

        * Count size of the encrypted packet

        * @return TUint size of the encrypted packet

        */                                  

        TUint CountEncryptedPacketSizeL();        

       /**

        * Count size of the decrypted packet

        * @return TUint size of the decrypted packet

        */                              

        TUint CountDecryptedPacketSize();                

    protected: //data    

        TUint32                     iPacketIndex;       // packet index                      

    };

#endif // __SRTP_PACKET_RTCP_H__