--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/zeroconf/dnsparser/src/cdnspacket.cpp	Thu Jun 24 19:09:47 2010 +0530
@@ -0,0 +1,254 @@
+/*
+* Copyright (c) 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: 
+*
+*/
+
+
+#include "cdnspacket.h"
+	
+	
+CDnsPacket::CDnsPacket(const TDes8& aPacketPtr): iPtr(aPacketPtr.Ptr()),iDataLength(aPacketPtr.Size()),
+           iMaxLength(aPacketPtr.MaxSize())
+	{	
+	}
+
+CDnsPacket* CDnsPacket::NewL(const TDes8& aPacketPtr)
+	{
+	CDnsPacket* self =  new (ELeave) CDnsPacket( aPacketPtr );	
+	CleanupStack::PushL(self);
+	self->ConstructL();
+	CleanupStack::Pop(self);
+	return self;
+	}	
+		
+CDnsPacket::~CDnsPacket()
+	{	
+	}
+		
+void CDnsPacket::ConstructL()
+	{
+	iIndex = 0;
+	}
+	
+TUint8 CDnsPacket::GetCharL()
+	{
+	__OOB(iIndex,iDataLength)
+	TUint8 val = *(iPtr+iIndex);
+	iIndex += sizeof(TUint8);		
+	return val;
+	}
+		
+TUint16 CDnsPacket::GetInt16L()
+	{
+	__OOB(iIndex,iDataLength)
+	TUint16 val = BigEndian::Get16(iPtr+iIndex);
+	iIndex += sizeof(TUint16);		
+	return val;
+	}
+		
+TUint32 CDnsPacket::GetInt32L()
+	{
+	__OOB(iIndex,iDataLength)
+	TUint32 val = BigEndian::Get32(iPtr+iIndex);
+	iIndex += sizeof(TUint32);		
+	return val;
+	}
+
+const TDnsHeader& CDnsPacket::GetHeaderL()
+	{
+	iHeader.SetId(GetInt16L());
+	iHeader.SetFlags(GetInt16L());
+	iHeader.SetQueryCount(GetInt16L());
+	iHeader.SetAnswerCount(GetInt16L());
+	iHeader.SetAuthorityNSCount(GetInt16L());
+	iHeader.SetAdditionalRCount(GetInt16L());
+	
+	return iHeader;
+	}
+
+void CDnsPacket::GetDomainNameL(TDes8& aName)
+	{	
+	TInt labelLen = GetCharL();
+	RBuf8 label;
+	TInt isStartingWithPointer = labelLen & KPointerBit;
+	
+	if(isStartingWithPointer)
+	    {
+		TUint16 pointerOffset = labelLen & KPointerOffsetBit;
+		__OOB(pointerOffset,iDataLength)
+		pointerOffset = (pointerOffset << 8) + GetCharL();
+		GetDomainNameAtIndexL(aName, pointerOffset);			
+	    }
+	else
+		{
+		while(labelLen)
+			{			
+			TInt isPointer = labelLen & KPointerBit;			
+			if(isPointer)
+				{
+				TUint16 pointerOffset = labelLen & KPointerOffsetBit;
+				__OOB(pointerOffset,iDataLength)
+				pointerOffset = (pointerOffset << 8) + GetCharL();
+				label.CreateL(KMaxDNSNameLength);
+				GetStringAtIndexL(label,pointerOffset);		
+				}
+			else
+				{
+				label.CreateL(labelLen);
+				GetStringL(label,labelLen);
+				}			
+			aName.Append(label);
+            if(aName[aName.Size()-1]!='.')
+                aName.Append(KDot);
+			label.Close();
+			if(isPointer )
+				{
+				break;
+				}
+			else
+				{
+				labelLen = GetCharL();		
+				}			
+			}
+		}		
+	}
+	
+void CDnsPacket::GetRdDomainNameL(TDes8& aDomainName,TUint aLength)
+	{	
+	TInt labelLen = GetCharL();
+	aLength--;
+	RBuf8 label;
+	TInt isStartingWithPointer = labelLen & KPointerBit;
+	
+	while(aLength)
+		{		
+		TInt isPointer = labelLen & KPointerBit;	
+		if(isPointer)
+			{
+			TUint16 pointerOffset = labelLen & KPointerOffsetBit;
+			__OOB(pointerOffset,iDataLength)
+			pointerOffset = (pointerOffset << 8) + GetCharL();
+			aLength--;
+			label.CreateL(KMaxLabelLength);
+			if(isStartingWithPointer )  
+				{
+				GetDomainNameAtIndexL(aDomainName, pointerOffset);
+				}
+			else
+				{
+				GetDomainNameAtIndexL(label, pointerOffset);
+				//GetStringAtIndexL(label, pointerOffset);				
+				}
+			}
+		else
+			{
+			label.CreateL(labelLen);
+			GetStringL(label,labelLen);
+			aLength-=labelLen;
+			}
+			
+		aDomainName.Append(label);
+		label.Close();
+		if(isStartingWithPointer)
+			{
+			break;
+			}
+		else
+			{
+			if(aLength )
+				{
+				labelLen = GetCharL();
+				aLength--;
+                if(aDomainName[aDomainName.Size()-1]!='.')
+                    aDomainName.Append(KDot);
+				}
+			}
+		}
+	}
+
+void CDnsPacket::GetStringL(TDes8& aString, TUint16 aLength)	
+	{
+	__OOB(iIndex,iDataLength)
+	aString.Copy(iPtr+iIndex,aLength);
+	iIndex+= aLength;
+	}
+
+void CDnsPacket::GetDomainNameAtIndexL(TDes8& aDomainName, TUint aOffset)
+	{
+	__OOB(aOffset,iDataLength)
+	TUint8 labelLen = *(iPtr + aOffset);
+	RBuf8 label;
+	TInt isPointer;
+	TUint16 pointerOffset;
+	TInt isStartingWithPointer = labelLen & KPointerBit;
+	TUint8 ptrPos;
+	if(isStartingWithPointer)
+		{
+		pointerOffset = labelLen & KPointerOffsetBit;
+		__OOB(aOffset,iDataLength)
+		aOffset++;
+		ptrPos = *(iPtr + aOffset);
+		pointerOffset = (pointerOffset << 8) + ptrPos;		
+		GetDomainNameAtIndexL(aDomainName, pointerOffset);
+		}
+	else
+		{
+		while(labelLen)		
+			{
+			label.CreateL(KMaxLabelLength);
+			GetStringAtIndexL(label, aOffset);
+			aDomainName.Append(label);
+            if(aDomainName[aDomainName.Size()-1]!='.')
+                aDomainName.Append(KDot);
+			__OOB(aOffset,iDataLength)
+			aOffset++; // increment by one byte for length field
+			aOffset += labelLen;
+			label.Close();	
+			labelLen = 	*(iPtr + aOffset);
+			isPointer = labelLen & KPointerBit;
+			if(isPointer)
+				{
+				pointerOffset = labelLen & KPointerOffsetBit;
+				__OOB(aOffset,iDataLength)
+				aOffset++;
+				ptrPos = *(iPtr + aOffset);
+				pointerOffset = (pointerOffset << 8) + ptrPos;			
+				label.CreateL(KMaxLabelLength);
+				GetStringAtIndexL(label, pointerOffset);				
+				aDomainName.Append(label);
+				if(aDomainName[aDomainName.Size()-1]!='.')
+				    aDomainName.Append(KDot);
+				label.Close();
+				break;
+				}
+			}
+		}	
+	}
+		
+void CDnsPacket::GetStringAtIndexL(TDes8& aLabel, TUint aOffset)
+	{
+	__OOB(aOffset,iDataLength)
+	TUint8 labelLen = *(iPtr + aOffset);
+	if(labelLen & KPointerBit)		// recursive pointers
+		{
+		TUint16 pointerOffset = labelLen & KPointerOffsetBit;
+		pointerOffset = (pointerOffset << 8) + GetCharL();
+		GetStringAtIndexL(aLabel, pointerOffset);
+		}
+	else
+		{
+		aLabel.Copy(iPtr+aOffset+1, labelLen);			
+		}
+	}