telephonyprotocols/rawipnif/src/Receiver.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 11 May 2010 17:18:08 +0300
branchRCL_3
changeset 27 4284d6390a82
parent 17 3f227a47ad75
child 60 1ac40e087278
permissions -rw-r--r--
Revision: 201019 Kit: 201019
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// Copyright (c) 2002-2010 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Implements the active object that controls the Read() requests.
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// 
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//
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/**
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 @file
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*/
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#include "Receiver.h"
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#include "Constants.h"
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#include <es_ini.h>
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const TUint KBufferIncreaseStep=500;
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const TUint K64k=65535;
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CReceiver::CReceiver(CBcaIoController& aObserver, CBttLogger* aTheLogger, TUint aMaxPacketSize)
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/**
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 * Constructor. Performs standard active object initialisation.
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 *
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 * @param aObserver Reference to the observer of this state machine
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 * @param aTheLogger The logging object
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 */
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	: CActive(EPriorityHigh), 
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	  iObserver(aObserver), 
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	  iTheLogger(aTheLogger),
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	  iMaxPacketSize(aMaxPacketSize)
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	{	
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	CActiveScheduler::Add(this);
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	}
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CReceiver* CReceiver::NewL(CBcaIoController& aObserver, CBttLogger* aTheLogger, TUint aMaxPacketSize)
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/**
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 * Two-phase constructor. Creates a new CBcaIoController object, performs 
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 * second-phase construction, then returns it.
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 *
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 * @param aObserver The observer, to which events will be reported
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 * @param aTheLogger The logging object
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 * @return A newly constructed CBcaIoController object
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 */
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	{
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	CReceiver* self = new (ELeave) CReceiver(aObserver, aTheLogger, aMaxPacketSize);
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop(self);
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	return self;
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	}
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void CReceiver::ConstructL()
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/**
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 * Second-phase constructor. Creates all the state objects it owns.
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 */
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	{
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	_LOG_L1C1(_L8("CReceiver::ConstructL"));
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	iData.CreateL(iMaxPacketSize);
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	}
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CReceiver::~CReceiver()
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/**
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 * Destructor.
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 */
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	{
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	iData.Close();
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	Cancel();
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	}
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void CReceiver::RunL()
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/**
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 *  Method called when read request completes. This will only be once the BCA has a full IP 
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 *  packet in its buffer.
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 */
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	{
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	_LOG_L1C2(_L8("CReceiver::RunL [iStatus=%d]"), iStatus.Int());
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	if (iStatus != KErrNone)
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		{
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		if (iStatus == KErrNoMemory)
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			{
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			_LOG_L2C1(
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				_L8("WARNING! CReceiver: Read failed with KErrNoMemory. Increase buffer."));
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			// Read operation failed!! Nif will re-issue the read request. Increase buffer.			
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			if ((iMaxPacketSize + KBufferIncreaseStep) > K64k)
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			    {
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			    // In theory IP packet can't be bigger than 64k, so if we come here something is wrong so stop observer. 
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                iObserver.Stop(KErrNoMemory);
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			    }
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			else
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			    {
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                iMaxPacketSize += KBufferIncreaseStep;
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                TInt err = iData.ReAlloc(iMaxPacketSize);
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                if (KErrNoMemory == err)
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                    {                
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                    iObserver.Stop(KErrNoMemory);
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                    }
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                else
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                    {
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                    (iObserver.Bca())->Read(iStatus, iData);    
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                    SetActive();
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                    }
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			    }
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			}
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		else 
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			{
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			_LOG_L2C1(_L8("WARNING! CReceiver: Read failed"));
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			iObserver.Stop(iStatus.Int());
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			}
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		return;
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		}
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	else
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	    {
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        _LOG_L1C1(_L8("CReceiver: Data Packet Received"));
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        iRMBufPacket.CreateL(iData);
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        // Immediately execute new read request.
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        (iObserver.Bca())->Read(iStatus, iData);
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        SetActive();
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        iRMBufPacket.Pack();
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0
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#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
16
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        TUint16 protocolCode = iObserver.RemoveHeader(iRMBufPacket);
0
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#else
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        TUint16 protocolCode = 0;
0
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#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
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        // Process the packet
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        iObserver.GetObserver().Process(iRMBufPacket, protocolCode);
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        iRMBufPacket.Free();
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	    }
0
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	}
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27
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TInt CReceiver::RunError(TInt aError)
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    {
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    _LOG_L2C1(_L8("WARNING! CReceiver::RunError Read failed"));
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    iObserver.Stop(aError); 
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    return KErrNone;  
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    }
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0
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void CReceiver::DoCancel()
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/**
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 *	Cancel active request
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 */
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	{
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	_LOG_L1C1(_L8("CReceiver::DoCancel"));
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	(iObserver.Bca())->CancelRead(); 
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	}
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void CReceiver::StartListening()
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/**
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 *  This method issues a Read request. This is the API used to receive 
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 *  packets from BCA.  
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 */
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	{
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	_LOG_L1C1(_L8("CReceiver::StartListening"));
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	// The BCA will complete this read once it has a full IP packet in its buffer.
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	(iObserver.Bca())->Read(iStatus, iData);
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	SetActive();
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	}