--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tcpiputils/dhcp/src/DomainNameDecoder.cpp	Tue Jan 26 15:23:49 2010 +0200
@@ -0,0 +1,141 @@
+// 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 "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:
+// Decodes domain names within protocol messages as specified in:
+// "RFC 1035 - Domain names - implementation and specification"
+// 
+//
+
+/**
+ @file DomainNameDecoder.cpp
+ @internalTechnology
+*/
+
+#include "DomainNameDecoder.h"
+
+void CDomainNameCodec::EncodeL(TDomainNameArray& aNames, RBuf8& aBuf8)
+	{
+	TUint requiredLength = 0;
+	TUint8 nameIdx = 0;
+	
+	for (nameIdx=0;nameIdx<aNames.Count();nameIdx++)
+		{
+		// The total length required for the labels that comprise an
+		// individual domain name needs to take into the length octet
+		// for the initial label and the null-termination character.
+		// Hence the '+ 2' below.
+		requiredLength += (aNames[nameIdx].Length() + 2);		
+		
+		// A further length check is performed on each domain name to
+		// ensure it does not exceed the maximum length permitted according
+		// to RFC 1035.
+		if(aNames[nameIdx].Length() > KMaxDomainNameLength)
+			{
+			User::Leave(KErrArgument);
+			}
+		}		
+	
+	aBuf8.Zero();
+	aBuf8.ReAllocL(requiredLength);
+	
+	TLex8 domainName;
+	TPtrC8 currentLabel;
+	
+	for (nameIdx=0;nameIdx<aNames.Count();nameIdx++)
+		{
+		domainName.Assign(aNames[nameIdx]);		
+		domainName.Mark();
+		
+		while (!domainName.Eos())
+			{
+			TChar ch;
+			do
+				{
+				ch = domainName.Get();
+				}
+			while ( ch != TChar('.') && !domainName.Eos() );
+			
+			// if not the end of the string, unget the previous char to skip the trailing
+			//  dot in our marked token
+			//
+			if( !domainName.Eos() )
+				{
+				domainName.UnGet();
+				}
+			
+			currentLabel.Set(domainName.MarkedToken());
+			
+			// move past the dot again, or do nothing in particular at EOS
+			//
+			domainName.Get();
+			
+			User::LeaveIfError(currentLabel.Length() > KMaxDnsLabelLength ? 
+				KErrArgument : KErrNone);
+			
+			aBuf8.Append(TChar(currentLabel.Length()));
+			aBuf8.Append(currentLabel);
+			
+			domainName.Mark();
+			}
+		
+		aBuf8.Append(TChar(0));
+		}
+	}
+
+void CDomainNameCodec::DecodeL(TPtr8& aInDes)
+	{
+	TDomainName domainName;
+
+	TUint8* pChar = const_cast<TUint8*>(aInDes.Ptr());
+	TUint listLength = aInDes.Length();
+	TUint8 labelLength = 0;
+	
+	// Walk the list of domain names
+	while(pChar < aInDes.Ptr() + listLength)
+		{
+		domainName.Zero();
+		
+		while(*pChar++ != NULL)
+			{
+			if(domainName.Length() > 0)
+				{
+				domainName.Append('.');
+				}
+				
+			labelLength = *(pChar - 1);
+			
+			// The two highest order bits must be clear
+			User::LeaveIfError(labelLength & 0xC0 ? KErrArgument : KErrNone);
+					
+			// Add in the label data
+			domainName.Append(pChar, labelLength);
+			
+			// Advance the pointer to the next length value
+			pChar += labelLength;
+			}
+			
+		iDomainList.Append(domainName);
+		}
+	}
+	
+CDomainNameCodec::~CDomainNameCodec()
+	{
+	iDomainList.Close();
+	}
+	
+	
+	
+	
+	
+	
+