/*

* 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 (RTP)

*

*/

#ifndef __SRTP_PACKET_RTP_H__

#define __SRTP_PACKET_RTP_H__

// INCLUDES

#include <in_sock.h>

#include "srtppacket.h"

#include <e32math.h>

// FORWARD DECLARATIONS

class CSRTPCryptoHandler;

/**

* Contains general RTP-specific packet routines

*/

class CSRTPPacketRTP : public CSRTPPacket

    {

    public:

    	static CSRTPPacketRTP* NewL(const TDesC8& aPacket,

                      CSRTPCryptoHandler& aHandler);

        /**

        * Get sequence number.

        * @return 16 bit sequence number.

        */                              

        TUint16 SequenceNumber();         

        /**

        * Get packet index.

        * @return TUint64 packet index.

        */                              

        TUint64 PacketIndex();

        /**

        * Set packet index.

        * @param aPacketIndex  new packet index

        * @return void

        */                              

        void SetPacketIndex(TUint64 aPacketIndex);

        /**

        * Count sender packet index.

        * @return void

        */                              

        void CountSenderPacketIndex();  

        /**

        * 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 CSRTPPacketSRTP.

        */                              

        virtual HBufC8* CreateDecryptedPacketL(TUint8* aDecryptedPayloadPtr);

        /**

        * virtual function for getting the authentication tag

        * implemented in CSRTPPacketSRTP.

        */                              

        virtual TPtrC8 AuthenticationTag();

        /**

        * virtual function for getting the master key identifier

        * implemented in CSRTPPacketSRTP.

        */                              

        virtual TPtrC8 MasterKeyIdentifier();

		/*

        * Update header length member

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

        * @return void

        */

        void UpdateHeaderLengthL();  

        /**

        * Get Sender Roll-Over Counter from RTP/SRTP packets defined by RCC mode

        * @return 32 bit unsigned integer 

        */                              

        TUint32 GetSenderROC(); 

    protected: //methods        

        CSRTPPacketRTP (const TDesC8& aPacket,

                      CSRTPCryptoHandler& aHandler);

        ~CSRTPPacketRTP(); 

        /**

        * Update payload length information

        * @return void

        */                              

        void UpdatePayloadLength();

        void ConstructL();   

        TBool TagWithROCLengthL();  

    private: //methods

       /**

        * Read sequence number and update class member

        * @return void

        */                              

        void UpdateSequenceNumber();    

       /**

        * 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();                

    private: //data    

        TUint16                       iSequenceNumber;   // sequence number

        TUint64                       iPacketIndex;      // packet index   

        TUint32 					  iSenderROC; 		 //used in RCC modes       

     #ifdef EUNIT_TESTING

        friend class UT_CSRTPCryptoHandlerSRTP;

        friend class UT_CSRTPCryptoHandler;

    #endif     

    };

#endif // __SRTP_PACKET_RTP_H__