rtp/srtpstack/inc/srtppacket.h
author hgs
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201037_04
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/*
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* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:    General SRTP packet class (RTP/SRTP/RTCP/SRTCP)
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*
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*/
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#ifndef __SRTP_PACKET_H__
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#define __SRTP_PACKET_H__
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// INCLUDES
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#include <in_sock.h>
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// FORWARD DECLARATIONS
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class CSRTPCryptoHandler;
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/**
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* Contains general packet routines
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*/
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class CSRTPPacket : public CBase
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    {
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    public:
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        /**
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        * Get payload entry. Here the "payload" denotes the
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        * encrypted portion (incl. RTCP/SRTCP).
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        * @return pointer reference to the encrypted portion. 
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        */        
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        TPtrC8 Payload();    
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        /**
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        * Get header length.
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        * @return length of the header.
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        */        
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        TUint HeaderLength();
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        /**
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        * Get payload length (== length of the encrypted portion).
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        * @return length of the payload.
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        */        
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        TUint PayloadLength();
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        /**
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        * Get header and encrypted portion, excluding possible 
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        * MKI and authentication tag.
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        * @return header and encrypted portion.
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        */                            
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        TPtrC8 HeaderAndPayload();      
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        /**
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        * Get the authentication portion for recv stream data
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        * For RTP this gets header and payload as authentication portion
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        * For RTCP it gets payload + SRTCP index
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        * @param rtcp if it is rtcp packet
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        * @leave KErrNone if success, system-wide error code otherwise        
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        * @return payload concatenated with ROC.
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        */                            
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        HBufC8* Get_Concatenated_MDataL(TBool rtcp); 
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        /**
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        * Create a new packet by allocating given size
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        * and by copying header and given payload.
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        * This can be any packet: RTP/SRTP/RTCP/SRTCP
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        * @param aPacketSize  new packet size.
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        * @param aPayloadPtr   pointer to the payload to be copied.
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        * @leave KErrNone if success, system-wide error code otherwise        
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        * @return new packet with header and payload.
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        */                            
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        HBufC8* CopyHeaderAndPayloadL(TUint aPacketSize,
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                                       TUint8* aPayloadPtr);
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        ~CSRTPPacket();                
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        /**
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        * virtual function for creating decrypted packet,
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        * implemented in CSRTPPacketSRTP/CSRTPPacketSRTCP,
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        */                            
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        virtual HBufC8* CreateDecryptedPacketL(TUint8* aDecryptedPayloadPtr);
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        /**
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        * virtual function for creating encrypted packet,
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        * implemented in CSRTPPacketRTP/CSRTPPacketRTCP,
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        */                            
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        virtual HBufC8* CreateEncryptedPacketL(TUint8* aEncryptedPayloadPtr);        
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        /**
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        * virtual function for getting the authentication tag,
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        * implemented in CSRTPPacketSRTP/CSRTPPacketSRTCP
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        */                                    
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        virtual TPtrC8 AuthenticationTag();
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        /**
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        * virtual function for getting the sequence number,
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        * implemented in CSRTPPacketRTP
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        */                                    
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        virtual TUint16 SequenceNumber(); 
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        /**
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        * virtual function for setting the packet index value,
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        * implemented in CSRTPPacketRTP
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        */                                    
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        virtual void SetPacketIndex(TUint64 aPacketIndex);
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        /**
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        * virtual function for getting the MKI value,
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        * implemented in CSRTPPacketSRTP/CSRTPPacketSRTCP
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        */                                            
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        virtual TPtrC8 MasterKeyIdentifier();
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        /**
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        * virtual function for counting the sender-side packet index
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        * implemented in CSRTPPacketRTP
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        */                                            
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        virtual void CountSenderPacketIndex(); 
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        /**
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        * virtual function for getting the packet index value,
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        * implemented in CSRTPPacketRTP
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        */                                    
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        virtual TUint64 PacketIndex();        
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		/**
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        * Get Sender Roll-Over Counter from RTP/SRTP packets defined by RCC mode
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        * @return 32 bit unsigned integer 
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        */                              
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        virtual TUint32 GetSenderROC(); 
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    protected: //methods
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        /*
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        * Update header length member
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        * @leave KErrNone if success, system-wide error code otherwise        
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        * @return void
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        */
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        void UpdatePayloadLengthL();
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        /*
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        * Update payload member in this class
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        * @leave KErrNone if success, system-wide error code otherwise        
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        * @return void
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        */
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        void UpdatePayload();        
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        /*
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        * Read sequence number. 
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        * @return 16 bit sequence number.
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        */
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        TUint16 GetSequenceNumber();
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        void ConstructL();
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        CSRTPPacket (const TDesC8& aPacket,
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                      CSRTPCryptoHandler& aHandler);
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    protected: //data
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        TPtrC8                        iPacket;  // packet
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    	const TUint8                  *iDataP;  // pointer to packet
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        CSRTPCryptoHandler&           iHandler; // crypto handler
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        TPtrC8                        iPayload; // payload (encrypted portion)
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        TUint                         iHeaderLength; // header length
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        TUint                         iPayloadLength; // payload length
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	private:
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    #ifdef EUNIT_TESTING
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        friend class UT_CSRTPCryptoHandlerSRTP;
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    #endif 
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    };
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#endif // __SRTP_PACKET_H__