--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/epoc32/include/tcpseq.h	Tue Mar 16 16:12:26 2010 +0000
@@ -0,0 +1,82 @@
+// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members
+// which accompanies this distribution, and is available
+// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// tcpseq.h - TCP sequence numbers
+// This module defines a TCP sequence number with mod32 arithmetic.
+//
+
+
+
+/**
+ @file tcpseq.h
+ @publishedAll
+ @released
+*/
+
+#ifndef __TCPSEQ_H__
+#define __TCPSEQ_H__
+
+#include <e32std.h>
+
+
+/**  TCP sequence number with mod-32 arithmetic.
+@publishedAll
+@released
+*/
+class TTcpSeqNum
+	{
+public:
+  	inline TTcpSeqNum()					  			{ iSeq = 0; }
+  	inline TTcpSeqNum(TUint32 aSeq)			  		{ iSeq = aSeq; }
+  	inline TTcpSeqNum(const TTcpSeqNum& aSeq)		{ iSeq = aSeq.iSeq; }
+
+  	inline TTcpSeqNum& operator=(TUint32 aSeq)		  { iSeq = aSeq; return *this; }
+  	inline TTcpSeqNum& operator=(const TTcpSeqNum& aSeq)	  { iSeq = aSeq.iSeq; return *this; }
+  	inline TTcpSeqNum& operator+=(TInt aOff)		  { iSeq += aOff; return *this; }
+  	inline TTcpSeqNum& operator-=(TInt aOff)		  { iSeq -= aOff; return *this; }
+
+  	inline TTcpSeqNum& operator++()			{ ++iSeq; return *this; }
+  	inline TTcpSeqNum operator++(TInt)		{ return iSeq++; }
+  	inline TTcpSeqNum& operator--()			{ --iSeq; return *this; }
+  	inline TTcpSeqNum operator--(TInt)		{ return iSeq--; }
+
+  	inline TBool operator==(const TTcpSeqNum& aSeq) const	{ return iSeq == aSeq.iSeq; }
+  	inline TBool operator!=(const TTcpSeqNum& aSeq) const	{ return iSeq != aSeq.iSeq; }
+  	inline TBool operator<(const TTcpSeqNum& aSeq) const	{ return (TInt32)(iSeq - aSeq.iSeq) < 0; }
+  	inline TBool operator<=(const TTcpSeqNum& aSeq) const	{ return (TInt32)(iSeq - aSeq.iSeq) <= 0; }
+  	inline TBool operator>(const TTcpSeqNum& aSeq) const	{ return (TInt32)(iSeq - aSeq.iSeq) > 0; }
+  	inline TBool operator>=(const TTcpSeqNum& aSeq) const	{ return (TInt32)(iSeq - aSeq.iSeq) >= 0; }
+  	inline TTcpSeqNum operator+(TInt aOff) const		  	{ return iSeq + aOff; }
+  	inline TTcpSeqNum operator-(TInt aOff) const		  	{ return iSeq - aOff; }
+  	inline TInt32 operator-(const TTcpSeqNum& aSeq) const   { return iSeq - aSeq.iSeq; }
+
+  	//
+  	// Automatic typecast can lead to ambiguous expressions and
+  	// in the worst case to some very hard-to-track errors.
+  	// We use the following explicit typecast instead. -ML
+  	//
+  	inline TUint32 Uint32() const				  { return iSeq; }
+	//inline operator TUint32() const			  { return iSeq; }
+
+  	// Methods for checking whether a sequence number is inside or outside a given window.
+  	inline TBool Inside(TTcpSeqNum aSeqLo, TTcpSeqNum aSeqHi)
+    	{ return (iSeq - aSeqLo.iSeq) <= (aSeqHi.iSeq - aSeqLo.iSeq); }
+
+  	inline TBool Outside(TTcpSeqNum aSeqLo, TTcpSeqNum aSeqHi)
+    	{ return (iSeq - aSeqLo.iSeq) > (aSeqHi.iSeq - aSeqLo.iSeq); }
+
+private:
+  	TUint32 iSeq;
+	};
+
+#endif