bluetooth/btstack/l2cap/l2capMuxController.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 15 Jan 2010 08:13:17 +0200
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// Copyright (c) 1999-2009 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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// Holds a list of all Muxers and listening SAP signal handlers.
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// 
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//
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#include <bluetooth/logger.h>
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#include "l2capSAPSignalHandler.h"
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#include "l2capMuxController.h"
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#include "l2capCommand.h"
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#include "l2signalmgr.h"
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#include "l2util.h"
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#ifdef __FLOG_ACTIVE
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_LIT8(KLogComponent, LOG_COMPONENT_L2CAP);
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#endif
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CL2CAPMuxController::~CL2CAPMuxController()
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	{
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	LOG_FUNC
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	// Delete all L2Cap Muxers 
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	TDblQueIter<CL2CAPMux> muxIter(iMuxers);
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	CL2CAPMux* muxerPtr;
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	while((muxerPtr = muxIter++) != NULL)
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		{
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		delete muxerPtr;
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		}
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	// Delete all the listening SAP Signal Handlers 
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	TDblQueIter<CL2CapSAPSignalHandler> listeningSapIter(iListeningSapSignalHandlers);
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	CL2CapSAPSignalHandler* sapSignalPtr;
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	while((sapSignalPtr = listeningSapIter++) != NULL)
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		{
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		delete sapSignalPtr;
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		}
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	// Delete all the bound SAP Signal Handlers 
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	TDblQueIter<CL2CapSAPSignalHandler> boundSapIter(iBoundSapSignalHandlers);
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	while((sapSignalPtr = boundSapIter++) != NULL)
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		{
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		delete sapSignalPtr;
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		}		
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	}
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CL2CAPMuxController::CL2CAPMuxController(CL2CAPProtocol& aProtocol)
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	: 
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	iMuxers(_FOFF(CL2CAPMux, iMuxControllerLink)),
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	iBoundSapSignalHandlers(_FOFF(CL2CapSAPSignalHandler, iLink)),
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	iListeningSapSignalHandlers(_FOFF(CL2CapSAPSignalHandler, iLink)),
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	iProtocol(aProtocol)
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	{
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	LOG_FUNC
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	}
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// This method is called to register the signal handler owned by a cloned SAP to the
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// appropriate Mux.  A Mux should always be available as this event has been triggered
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// by receipt of an incoming connection.
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TInt CL2CAPMuxController::AttachPassiveSignalHandler(CL2CapSAPSignalHandler& aSAPSignalHandler,const TBTDevAddr& aAddr)
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	{
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	LOG_FUNC
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	// Find the muxer and register the SAP SH.
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	TInt rerr = KErrNone;
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	CL2CAPMux* mux = FindMuxer(aAddr);
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	if(mux)
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		{
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		mux->RegisterSAPSignalHandler(aSAPSignalHandler);
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		}
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	else
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		{
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		rerr = KErrSessionClosed;
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		}
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	return rerr;
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	}
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// This method is called to register an active SAP signal handler to the appropriate Mux.
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// If the Mux does not exist a new one will be allocated and tasked with establishing
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// an ACL connection.	
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TInt CL2CAPMuxController::AttachActiveSignalHandler(CL2CapSAPSignalHandler& aSAPSignalHandler,const TBTDevAddr& aAddr)
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	{
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	LOG_FUNC
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	TInt rerr = KErrNone;
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	CL2CAPMux* mux = FindMuxer(aAddr);
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	if(mux)
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		{
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		mux->RegisterSAPSignalHandler(aSAPSignalHandler);
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		}
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	else
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		{
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		TRAP(rerr, mux = CreateMuxerL(aAddr));
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		if(rerr == KErrNone)
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			{
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			mux->RegisterSAPSignalHandler(aSAPSignalHandler);
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			aSAPSignalHandler.ActiveConnectionRequest();
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			}
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		}
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	return rerr;	
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	}
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// This method adds a listening SAP signal handler to the list of current listeners.	
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void CL2CAPMuxController::AttachListeningSignalHandler(CL2CapSAPSignalHandler& aSAPSignalHandler)
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	{
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	LOG_FUNC
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	iListeningSapSignalHandlers.AddLast(aSAPSignalHandler);
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	}
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// This method adds a bound SAP signal handler to the bound list.
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void CL2CAPMuxController::AttachBoundSignalHandler(CL2CapSAPSignalHandler& aSAPSignalHandler)
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	{
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	LOG_FUNC
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	iBoundSapSignalHandlers.AddLast(aSAPSignalHandler);	
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	}
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TInt CL2CAPMuxController::BearerConnectComplete(const TBTDevAddr& aAddr, CServProviderBase* aSAP)
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	{
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	LOG_FUNC
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	TInt retVal;
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	CL2CAPMux* muxer = FindMuxer(aAddr);
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	if(!muxer)
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		{
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		// If no error occurs, ownership of aSSP passes to the Mux;
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		TRAP(retVal, muxer = CreateMuxerL(aAddr));	
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		if(retVal == KErrNone)
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			{
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			TRAP(retVal, muxer->CompleteACLConnect(aSAP));
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			}
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		}
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	else
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		{
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		retVal = KErrAlreadyExists;
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		}
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	return retVal;
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	}
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CL2CAPMux* CL2CAPMuxController::FindMuxer(const TBTDevAddr& aAddr)
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/**
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	Find muxer by BT address.
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	Lookup this address to find if there's a L2CAP Mux associated
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    with it
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**/
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	{
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	LOG_FUNC
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	TDblQueIter<CL2CAPMux> muxIter(iMuxers);
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	muxIter.SetToFirst();
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	CL2CAPMux* muxerPtr = NULL;
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	while((muxerPtr = muxIter++) != NULL)
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		{
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		if(muxerPtr->RemoteBTAddr() == aAddr)
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			{
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			break;
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			}
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		}
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	return muxerPtr;
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	}	
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CL2CAPMux* CL2CAPMuxController::CreateMuxerL(const TBTDevAddr& aAddr)
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/**
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   Create a new L2CAP Mux.
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   The muxer returned is owned by this CL2CAPMuxController -- it
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   does not hand over ownership of the mux to the caller.
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   Note that this function does not check (except in debug) that there
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   is no existing muxer.
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**/
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	{
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	LOG_FUNC
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	__ASSERT_DEBUG(!FindMuxer(aAddr), Panic(EL2CAPMuxAlreadyExists));
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	CL2CAPMux* muxer = CL2CAPMux::NewL(*this, aAddr);
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	iMuxers.AddFirst(*muxer);
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	return muxer;
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	}
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CL2CapSAPSignalHandler* CL2CAPMuxController::FindListeningSignalHandler(TL2CAPPort aPort)
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	{
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	LOG_FUNC
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	/** Searches the listening Q for a SAP listening at PSM: aPort
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	@return the listening SAP found, or zero (NULL) if not found.
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	**/
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	TDblQueIter<CL2CapSAPSignalHandler> sapIter(iListeningSapSignalHandlers);
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	CL2CapSAPSignalHandler* sapSignalPtr;
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	while((sapSignalPtr = sapIter++) != NULL)
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		{
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		if(sapSignalPtr->LocalPort() == aPort)
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			return sapSignalPtr;
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		}
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	return NULL;
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	}
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CL2CapSAPSignalHandler* CL2CAPMuxController::FindIdleSignalHandler(TL2CAPPort aPort)
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	{
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	LOG_FUNC
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	/** Searches the bound Q for a SAP bound to PSM: aPort and if it doesn't find one it
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	    then searches the listening Q.
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	@return the idle SAP found, or zero (NULL) if not found.
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	**/
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	TDblQueIter<CL2CapSAPSignalHandler> sapIter(iBoundSapSignalHandlers);
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	CL2CapSAPSignalHandler* sapSignalPtr;
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	while((sapSignalPtr = sapIter++) != NULL)
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		{
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		if(sapSignalPtr->LocalPort() == aPort)
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			return sapSignalPtr;
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		}
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	return FindListeningSignalHandler(aPort);
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	}
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void CL2CAPMuxController::UpdateMuxerPriorities()
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	{
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	LOG_FUNC
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	TDblQueIter<CL2CAPMux> muxIter(iMuxers);
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	CL2CAPMux* muxerPtr;
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	// Lowest muxer priority.
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	TInt muxerPriority = EBaseMuxerPriority;
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	// This starting value is equivalent to one or all of the channels
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	// open on a Mux being of priority low.
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	TInt currentSumMuxerPriorities = 0;
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	TInt nextSumMuxerPriorities;
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	TInt sum;
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	while(currentSumMuxerPriorities != KMaxTInt)
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		{
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		nextSumMuxerPriorities = KMaxTInt;
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		muxIter.SetToFirst();
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		while((muxerPtr = muxIter++) != NULL)		
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			{
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			sum = muxerPtr->GetSumMuxerChannelPriorities();
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			if(sum == currentSumMuxerPriorities)
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				{
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				muxerPtr->MuxerPriorityUpdate(muxerPriority);
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				}
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			if(sum > currentSumMuxerPriorities && sum < nextSumMuxerPriorities)
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				{
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				nextSumMuxerPriorities = sum;
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				}
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			}
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		currentSumMuxerPriorities = nextSumMuxerPriorities;
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		muxerPriority++;
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		}
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	}
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TInt CL2CAPMuxController::FindFreeUserPSM(TL2CAPPort& aPSM)
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	{
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	LOG_FUNC
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	TInt rerr = KErrL2CAPNoMorePSMs;
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	aPSM = KL2CapDynamicPSMStart;
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	// The PSM value will eventually wrap round if a free PSM
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	// can't be found.
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	while(aPSM >= KL2CapDynamicPSMStart)
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		{
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		if(FindIdleSignalHandler(aPSM) == NULL)
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			{
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			// There is not currently a SAP listening on this
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			// PSM, so this will be chosen.
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			rerr = KErrNone;
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			break;
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			}
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		aPSM+=2;
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		}
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	return rerr;
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	}
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   292