--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natfw/natfwunsaf_protocols/unsaf_codec/inc/natfwunsaftcprelaypacket.h	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,178 @@
+/*
+* Copyright (c) 2006-2007 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:   
+*
+*/
+
+
+
+
+#ifndef CNATFWUNSAFTCPRELAYPACKET_H
+#define CNATFWUNSAFTCPRELAYPACKET_H
+
+#include <e32base.h>
+
+/**
+* A class for UNSAF TCP relay packets
+*
+*  @lib natfwunsafprotocols.lib
+*  @since S60 3.2
+*/
+class CNATFWUNSAFTcpRelayPacket : public CBase
+    {
+public: // Enumerations
+
+    enum TFrame // draft-ietf-behave-turn-02
+        {
+        EFrameTypeOffset     = 0,
+        EFrameLengthOffset   = 2,
+        
+        EFrameTypePrefixMask = 0xff00,
+        EFrameSize           = 4
+        };
+    
+    enum TRelayType
+        {
+        EFrameTypeStun       = 0x02,
+        EFrameTypeData       = 0x03,
+        };
+        
+public: // Constructors and destructor
+    
+    /**
+    * Creates a CNATFWUNSAFTcpRelayPacket instance
+    * @param aData Data to be relayed
+    * @param aType Type of relay (STUN/DATA)
+    * @return A new instance of CNATFWUNSAFTcpRelayPacket
+    */
+    IMPORT_C static CNATFWUNSAFTcpRelayPacket*
+                NewL(const TDesC8& aData, const TRelayType aType);
+
+    /**
+    * Creates a CNATFWUNSAFTcpRelayPacket instance
+    * @param aData Data to be relayed
+    * @param aType Type of relay (STUN/DATA)
+    * @return A new instance of CNATFWUNSAFTcpRelayPacket
+    */
+    IMPORT_C static CNATFWUNSAFTcpRelayPacket*
+                NewLC(const TDesC8& aData, const TRelayType aType);
+
+    /**
+    * Creates a CNATFWUNSAFTcpRelayPacket instance.
+    * @param aData Data to be relayed
+    * @param aType Type of relay (STUN/DATA)
+    * @return A new instance of CNATFWUNSAFTcpRelayPacket
+    *       ownership is transferred.
+    */
+    static CNATFWUNSAFTcpRelayPacket*
+        CreateL(const TDesC8& aData, const TRelayType aType);
+
+    /**
+    * Destructor, deletes the resources of CNATFWUNSAFTcpRelayPacket.
+    */
+    virtual ~CNATFWUNSAFTcpRelayPacket();
+
+public: // New functions
+
+    /**
+    * Encodes a relay packet
+    * @return The encoded UNSAF TCP relay packet. The ownership is
+    *         transferred.
+    */
+    IMPORT_C CBufBase* EncodeL() const;
+
+    /**
+    * Returns the relayed data
+    * @return relayed data
+    */
+    IMPORT_C const TDesC8& Data() const;
+
+    /**
+    * Returns the relay type
+    * @return relay type
+    */
+    IMPORT_C TRelayType Type() const;
+
+    /**
+    * Retrieves the UNSAF TCP relay packet length from a UNSAF TCP relay
+    * packet header.
+    * @param aNATFWUNSAFTcpRelayPacket a UNSAF TCP relay packet
+    * @return KErrNotFound if length field cannot be parsed.
+    *         Otherwise the value of the length field.
+    */
+    static TInt RelayLength(const TDesC8& aNATFWUNSAFTcpRelayPacket);
+
+    /**
+    * Writes the length field into WUNSAF TCP relay packet header.
+    * @param aNATFWUNSAFTcpRelayPacket Encoded UNSAF TCP relay packet
+    *        whose length is to be calculated and written.
+    */
+    static void SetRelayLength(CBufBase& aNATFWUNSAFTcpRelayPacket);
+
+    /**
+    * Writes the length field into NATFWUNSAF TCP relay packet header.
+    * @param aNATFWUNSAFTcpRelayPacket Encoded UNSAF TCP relay packet whose
+    *        length is to be set.
+    * @param aLength Value to write into the length field.
+    */
+    static void SetRelayLength(CBufBase& aNATFWUNSAFTcpRelayPacket,
+        TInt aLength);
+
+protected: // Constructors
+
+    CNATFWUNSAFTcpRelayPacket();
+    
+    /**
+    * Second phase constructor.
+    * @param aData data to be relayed
+    * @param aType type of relay (STUN/DATA)
+    */
+    void ConstructL(const TDesC8& aData, const TRelayType aType);
+
+private:
+
+    /**
+    * Encodes the UNSAF TCP relay packet header.
+    * @return The encoded UNSAF relay packet header. The ownership is
+    *         transferred.
+    */
+    CBufBase* EncodeRelayHeaderLC() const;
+    
+    /**
+    * Checks that the length of relayed data is valid
+    * @param aLength Length of the relayed data
+    * @leave KErrCorrupt If the length is invalid
+    */
+    void CheckLengthL(TInt aLength) const;
+
+private: // Data
+    
+    //Relayed data, owned
+    HBufC8* iData;
+    
+    //Relay type
+    TRelayType iType;
+    
+private:
+
+    enum TValueDataGranularity
+        {
+        //The length of iValue has to be a multiple of 4
+        EGranularity = 4
+        };
+    };
+
+#endif // CNATFWUNSAFTCPRELAYPACKET_H
+
+