// 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:

// DHCPv6 Message receiver implementation file. Receiver keeps reading from socket untill the whole 

// message has been read

// 

//

/**

 @file

*/

#include "DhcpIP6MsgRcvr.h"

#include "DHCPServer.h"

#ifdef _DEBUG

#include <e32property.h>

#endif

CAsynchEvent* CDhcpIP6MessageReader::ProcessL(TRequestStatus& aStatus)

/**

  * Keeps reading from socket util the full UDP datagram has been received

  *

  * @internalTechnology

  *

  */

	{

	__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDhcpIP6MessageReader::ProcessL")));

	DHCPv6::CDHCPMessageHeaderIP6* v6Msg = DHCPIPv6().DhcpMessage();

	TPtr8 v6MsgDes = v6Msg->Message().Des();

	TInt length = v6MsgDes.Length();

   	if (iIncomingMsgDataPtr.Length() == 0)

		{

		v6MsgDes.Zero();

		// Create a pointer to the memory location represented by the HBufC 

		// containing the incoming message

		iIncomingMsgDataPtr.Set(const_cast<TUint8*>(v6MsgDes.Ptr()), 0, v6MsgDes.MaxLength());

		}

	else if (iUnreadLength() > 0) 

		{

		// Resize the message buffer for the remaining data

		iStateMachine->ReAllocL(iUnreadLength());

		// Move the access pointer to the end of the previously read data ready

		// for the start of the remainder

		iIncomingMsgDataPtr.Set(const_cast<TUint8*>(v6MsgDes.Ptr() + v6MsgDes.Length()), 0, iUnreadLength());		

		v6MsgDes.SetLength(length + iIncomingMsgDataPtr.Length());

		}

	else

		{	

		// We've finished reading the message, complete the request

		v6MsgDes.SetLength(length + iIncomingMsgDataPtr.Length());

		iIncomingMsgDataPtr.SetLength(0);

		TRequestStatus* p = &aStatus;

		User::RequestComplete(p, KErrNone);

		__CFLOG_VAR((KLogSubSysDHCP, KLogCode, _L8("CDhcpIP6MessageReader::ProcessL - finished")));

		return iNext;

		}

	iRcvAddr.SetAddress(KAFUnspec);

#ifdef _DEBUG

	// Simulate initialisation, renewal or rebind failure by using the wrong port.

	if( ( CDHCPServer::DebugFlags() & KDHCP_FailDiscover ) || ( CDHCPServer::DebugFlags() & KDHCP_FailRenew ) || ( CDHCPServer::DebugFlags() & KDHCP_FailRebind ) )

		{

		iRcvAddr.SetPort(KDhcpv6WrongSrcPort);

		}

	else

		{

		TInt destPort;

		RProperty::Get(KMyPropertyCat, KMyPropertyDestPortv6, destPort);

		iRcvAddr.SetPort(destPort - 1);

		}

#else

	iRcvAddr.SetPort(KDhcpv6SrcPort);

#endif	

	DHCPIPv6().iSocket.RecvFrom(iIncomingMsgDataPtr, iRcvAddr, KSockSelectReadContinuation, aStatus, iUnreadLength);

	return this;

	}