// Copyright (c) 2002-2010 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:

// Implements the active object that controls the Read() requests.

// 

//

/**

 @file

*/

#include "Receiver.h"

#include "Constants.h"

#include <es_ini.h>

const TUint KBufferIncreaseStep=500;

const TUint K64k=65535;

/**

 * Constructor. Performs standard active object initialisation.

 *

 * @param aObserver Reference to the observer of this state machine

 */

	: CActive(EPriorityHigh), 

	  iObserver(aObserver), 

	  iMaxPacketSize(aMaxPacketSize)

	{	

	CActiveScheduler::Add(this);

	}

/**

 * Two-phase constructor. Creates a new CBcaIoController object, performs 

 * second-phase construction, then returns it.

 *

 * @param aObserver The observer, to which events will be reported

 * @return A newly constructed CBcaIoController object

 */

	{

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

void CReceiver::ConstructL()

/**

 * Second-phase constructor. Creates all the state objects it owns.

 */

	{

	iData.CreateL(iMaxPacketSize);

	}

CReceiver::~CReceiver()

/**

 * Destructor.

 */

    {

    Cancel();

    // iData is a shared bit of memory between raw ip and bca

    // you cannot delete it while bca might be using it otherwise

    // bad things may happen.

    iData.Close();

    }

void CReceiver::RunL()

/**

 *  Method called when read request completes. This will only be once the BCA has a full IP 

 *  packet in its buffer.

 */

	{

	if (iStatus != KErrNone)

		{

		if (iStatus == KErrNoMemory)

			{

			if ((iMaxPacketSize + KBufferIncreaseStep) > K64k)

			    {

			    // In theory IP packet can't be bigger than 64k, so if we come here something is wrong so stop observer. 

                iObserver.Stop(KErrNoMemory);

			    }

			else

			    {

                iMaxPacketSize += KBufferIncreaseStep;

                TInt err = iData.ReAlloc(iMaxPacketSize);

                if (KErrNoMemory == err)

                    {                

                    iObserver.Stop(KErrNoMemory);

                    }

                else

                    {

                    (iObserver.Bca())->Read(iStatus, iData);    

                    SetActive();

                    }

			    }

			}

		else 

			{

			iObserver.Stop(iStatus.Int());

			}

		return;

		}

	else

	    {

        iRMBufPacket.CreateL(iData);

        // Immediately execute new read request.

        (iObserver.Bca())->Read(iStatus, iData);

        SetActive();

        iRMBufPacket.Pack();

#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS

        TUint16 protocolCode = iObserver.RemoveHeader(iRMBufPacket);

#else

        TUint16 protocolCode = 0;

#endif // RAWIP_HEADER_APPENDED_TO_PACKETS

        // Process the packet

        iObserver.GetObserver().Process(iRMBufPacket, protocolCode);

        iRMBufPacket.Free();

	    }

	}

TInt CReceiver::RunError(TInt aError)

    {

    iObserver.Stop(aError); 

    return KErrNone;  

    }

void CReceiver::DoCancel()

/**

 *	Cancel active request

 */

	{

	(iObserver.Bca())->CancelRead(); 

	}

void CReceiver::StartListening()

/**

 *  This method issues a Read request. This is the API used to receive 

 *  packets from BCA.  

 */

	{

	// The BCA will complete this read once it has a full IP packet in its buffer.

	(iObserver.Bca())->Read(iStatus, iData);

	SetActive();

	}