--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dbgagents/trkagent/engine/TrkFramingLayer.h	Tue Mar 02 10:33:16 2010 +0530
@@ -0,0 +1,92 @@
+/*
+* 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: 
+*
+*/
+
+
+#ifndef __TRKFRAMINGLAYER_H__
+#define __TRKFRAMINGLAYER_H__
+
+#include "TrkCommPort.h"
+
+//
+// Forward declarations
+//
+class CTrkDispatchLayer;
+
+
+//
+// class CTrkFramingLayer
+//
+// Frames outgoing messages to the host and unframes incoming messages
+// from the host
+//
+class CTrkFramingLayer : public CBase
+{
+public:
+
+	enum TFramingState
+	{
+		eWaiting,
+		eFound,
+		eInFrame,
+		eFrameOverflow
+	};
+
+	CTrkFramingLayer(CTrkCommPort* aPort);
+	~CTrkFramingLayer();
+
+	void Listen(CTrkDispatchLayer* aDispatchLayer);
+	void StopListening();
+
+	void HandleByte(TUint8 aByte);
+
+	void RespondOkL(const TDesC8& aMsg);
+	void RespondErr(TUint8 aType, TUint8 aErr);
+	void InformEventL(const TDesC8& aMsg);
+	void SendRawMsgL(const TDesC8& aMsg);
+	
+	TBool IsBigEndian() { return iIsBigEndian; };
+	void ResetSequenceIDs() { iSequenceId = 1; iOutSequenceId = 1; };
+
+private:
+
+	void SendMsgL(const TDesC8& aMsg);
+
+	void DiscardFrame();
+	TBool ProcessFrame();
+
+	void IncrementSequenceId() { if (iSequenceId == 0xFF) iSequenceId = 1; else iSequenceId++; };
+	void IncrementOutSequenceId() { if (iOutSequenceId == 0xFF) iOutSequenceId = 1; else iOutSequenceId++; };
+
+private:
+
+	CTrkCommPort* iPort;
+	CTrkDispatchLayer* iDispatchLayer;
+
+	TFramingState iFramingState;
+	TBool iEscape;
+	TUint8 iFCS;
+
+	TBuf8<MAXMESSAGESIZE> iBuffer;	// contains the incoming messages
+	TUint8 iSequenceId;
+	TUint8 iOutSequenceId;
+		
+	TBool iIsBigEndian;
+	
+	HBufC8* iLastReply;
+};
+
+#endif // __TRKFRAMINGLAYER_H__