bluetooth/btstack/l2cap/L2CapFecNegotiator.h
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// Copyright (c) 2006-2009 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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//
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/**
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 @file
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 @internalComponent
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*/
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#ifndef L2CAPFECNEGOTIATOR_H
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#define L2CAPFECNEGOTIATOR_H
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#include "L2types.h"
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class TL2CapFecNegotiator;
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class TL2CapSingleDirectionFecNegotiatorBase;
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// This encapsulates channel mode dependent FEC option handling behaviors.
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// Channel mode policy is applied outside of this.
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NONSHARABLE_CLASS(TModeSpecificFecOptionHandlerBase)
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	{
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public:
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	// Checks whether the field values are valid (within specification limits).
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	// To be used early, during the parsing of an option received from the peer.
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	// Note: valid doesn't mean acceptable.
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	virtual TBool IsOptionValid(const TRetransmissionAndFlowControlOption& aFecOption) const = 0;
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	virtual TBool IsPeerResponseAcceptable(const TRetransmissionAndFlowControlOption& aPreferred,
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										   const TRetransmissionAndFlowControlOption& aPeer) const = 0;
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	// The return value says whether the option needs to be included in ConfigRsp.
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	// [Only enhanced mode positive responses need to be included as they convey new information
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	// on the timers and MPS]
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	virtual TBool BuildPositiveResponse(TRetransmissionAndFlowControlOption& aPreferred,
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			   							const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual void BuildNegativeResponse(TRetransmissionAndFlowControlOption& aPreferred,
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									   const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual void BuildRequestBasedOnUnacceptableParamsResponse(
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					TRetransmissionAndFlowControlOption& aPreferred,
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					const TRetransmissionAndFlowControlOption& aPeer,
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					const TL2CapFecNegotiator& aFecNegotiator) const;
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0
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	// In general configuration procedure (spec chapter 7 General Procedures) if the remote accepts
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	// an option from our ConfigReq, it doesn't have to include it in the response. So before
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	// processing the options from a ConfigRsp we've received, we go through the preferred values
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	// we've sent in ConfigReq and pretend that the remote has accepted them without a hitch. Then
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	// options included in the received ConfigRsp are processed. This works well with plain-vanilla
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	// negotiated options, but TRetransmissionAndFlowControl for enhanced modes is different:
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	// request and response semantics are a bit different, and so the request does not contain all
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	// information needed in a response. So we have to take the request we've sent, guess the
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	// missing information, and thus create a fake response. And that's what this method does.
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	virtual void PrepareImplicitPeerResponse(TRetransmissionAndFlowControlOption& aImplicitResponse,
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											 const TRetransmissionAndFlowControlOption& aPreferred) const;
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	// Set user-requested MaxTransmit value. The value is given in the enhanced range
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	// 0-255, where 0 means infinity and is only valid for ERTM. Deriving classes are
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	// responsible for the cut-off of the infinity value on 255 if they can't handle it.
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	virtual void SetMaxTransmit(TRetransmissionAndFlowControlOption& aFecOption, TUint8 aMaxTransmit) const;
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	virtual void ZeroUnspecifiedRequestFields(TRetransmissionAndFlowControlOption& aFecOption) const;
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	virtual void ZeroUnspecifiedResponseFields(TRetransmissionAndFlowControlOption& aFecOption) const;
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	};
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NONSHARABLE_CLASS(TStreamingFecHandler) : public TModeSpecificFecOptionHandlerBase
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	{
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public:
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	virtual TBool IsOptionValid(const TRetransmissionAndFlowControlOption& aFecOption) const;
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	virtual TBool IsPeerResponseAcceptable(const TRetransmissionAndFlowControlOption& aPreferred,
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										   const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual TBool BuildPositiveResponse(TRetransmissionAndFlowControlOption& aPreferred,
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										const TRetransmissionAndFlowControlOption& aPeer) const;
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    virtual void BuildNegativeResponse(TRetransmissionAndFlowControlOption& aPreferred,
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                                       const TRetransmissionAndFlowControlOption& aPeer) const;	
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	virtual void ZeroUnspecifiedRequestFields(TRetransmissionAndFlowControlOption& aFecOption) const; 
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	virtual void ZeroUnspecifiedResponseFields(TRetransmissionAndFlowControlOption& aFecOption) const;
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	};
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NONSHARABLE_CLASS(TErtmFecHandler) : public TModeSpecificFecOptionHandlerBase
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	{
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public:
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	virtual TBool IsOptionValid(const TRetransmissionAndFlowControlOption& aFecOption) const;
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	virtual TBool IsPeerResponseAcceptable(const TRetransmissionAndFlowControlOption& aPreferred,
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										   const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual TBool BuildPositiveResponse(TRetransmissionAndFlowControlOption& aPreferred,
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										const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual void BuildNegativeResponse(TRetransmissionAndFlowControlOption& aPreferred,
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									   const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual void PrepareImplicitPeerResponse(TRetransmissionAndFlowControlOption& aImplicitResponse,
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											 const TRetransmissionAndFlowControlOption& aPreferred) const;
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	virtual void SetMaxTransmit(TRetransmissionAndFlowControlOption& aFecOption, TUint8 aMaxTransmit) const;
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	virtual void ZeroUnspecifiedRequestFields(TRetransmissionAndFlowControlOption& aFecOption) const; 
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	virtual void ZeroUnspecifiedResponseFields(TRetransmissionAndFlowControlOption& aFecOption) const;
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	};
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NONSHARABLE_CLASS(TLegacyFecHandler) : public TModeSpecificFecOptionHandlerBase
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	{
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public:
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	virtual TBool IsOptionValid(const TRetransmissionAndFlowControlOption& aFecOption) const;
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	virtual TBool IsPeerResponseAcceptable(const TRetransmissionAndFlowControlOption& aPreferred,
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										   const TRetransmissionAndFlowControlOption& aPeer) const;
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	virtual void BuildRequestBasedOnUnacceptableParamsResponse(
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                        TRetransmissionAndFlowControlOption& aPreferred,
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                        const TRetransmissionAndFlowControlOption& aPeer,
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                        const TL2CapFecNegotiator& aFecNegotiator) const;
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0
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	virtual void SetMaxTransmit(TRetransmissionAndFlowControlOption& aFecOption, TUint8 aMaxTransmit) const;
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	};
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NONSHARABLE_CLASS(TBasicFecHandler) : public TModeSpecificFecOptionHandlerBase
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	{
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public:
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	// Most peers will actually only request Basic implicitly i.e. by not including the FEC
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	// option at all, but we treat implicit/explicit values uniformly and will still execute
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	// these. And a Basic FEC can be explicit if the peer does new modes, but for some
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	// reason doesn't want to use them and has sent us an Unacceptable Params ConfigRsp with
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	// Basic in it.
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	virtual TBool IsOptionValid(const TRetransmissionAndFlowControlOption& aFecOption) const;
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	virtual TBool IsPeerResponseAcceptable(const TRetransmissionAndFlowControlOption& aPreferred,
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										   const TRetransmissionAndFlowControlOption& aPeer) const;
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	};
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// This groups all mode-specific handlers and provides delegator methods that forward calls to
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// appropriate FecHandlers.
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NONSHARABLE_CLASS(TFecOptionHandlerDelegator)
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	{
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public:
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	inline TBool IsOptionValid(const TRetransmissionAndFlowControlOption& aFecOption) const;
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	inline TBool IsPeerResponseAcceptable(const TRetransmissionAndFlowControlOption& aPreferred,
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										  const TRetransmissionAndFlowControlOption& aPeer) const;
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	inline TBool BuildPositiveResponse(TRetransmissionAndFlowControlOption& aPreferred,
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									   const TRetransmissionAndFlowControlOption& aPeer) const;
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	inline void BuildNegativeResponse(TRetransmissionAndFlowControlOption& aPreferred,
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									  const TRetransmissionAndFlowControlOption& aPeer) const;
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	inline void BuildRequestBasedOnUnacceptableParamsResponse(TRetransmissionAndFlowControlOption& aPreferred,
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															  const TRetransmissionAndFlowControlOption& aPeer,
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															  const TL2CapFecNegotiator& aFecNegotiator) const;
0
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	inline void PrepareImplicitPeerResponse(TRetransmissionAndFlowControlOption& aImplicitResponse,
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											const TRetransmissionAndFlowControlOption& aPreferred) const;
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	inline void SetMaxTransmit(TRetransmissionAndFlowControlOption& aFecOption, TUint8 aMaxTransmit) const;
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	inline void ZeroUnspecifiedRequestFields(TRetransmissionAndFlowControlOption& aFecOption) const;
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	inline void ZeroUnspecifiedResponseFields(TRetransmissionAndFlowControlOption& aFecOption) const;
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private:
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	TModeSpecificFecOptionHandlerBase& Handler(const TRetransmissionAndFlowControlOption& aFecOption);
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	const TModeSpecificFecOptionHandlerBase& Handler(const TRetransmissionAndFlowControlOption& aFecOption) const;
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	TModeSpecificFecOptionHandlerBase* ModeToHandler(TL2CapChannelMode aMode);
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	const TModeSpecificFecOptionHandlerBase* ModeToHandler(TL2CapChannelMode aMode) const;
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#ifdef __FLOG_ACTIVE
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	void LogCurrentValues(const TRetransmissionAndFlowControlOption& aPreferred,
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						  const TRetransmissionAndFlowControlOption& aPeer) const;
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#endif
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private:
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	TStreamingFecHandler	iStreamingFecHandler;
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	TErtmFecHandler			iErtmFecHandler;
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	TLegacyFecHandler		iLegacyFecHandler;
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	TBasicFecHandler		iBasicFecHandler;
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	};
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NONSHARABLE_CLASS(TL2CapSingleDirectionFecNegotiatorBase) : public TL2CapConfigurationOptionGroupBase
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{
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public:
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	inline TL2CapSingleDirectionFecNegotiatorBase(const TL2CapFecNegotiator& aFecNegotiator);
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	inline void SetPeer(const TRetransmissionAndFlowControlOption& aFecOption);
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	inline void SetPreferred(const TRetransmissionAndFlowControlOption& aFecOption);
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	void SetupForRenegotiation();
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	inline TOptionConfigStatus ConfigOptionStatus() const;
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	inline const TRetransmissionAndFlowControlOption& Peer() const;
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	inline const TRetransmissionAndFlowControlOption& Preferred() const;
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protected:
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	TBool IsPeerModeAcceptable(TL2CapChannelMode aPeerMode, TBool& aDisconnect) const;
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#ifdef __FLOG_ACTIVE
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	void LogState() const;
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#endif
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protected:
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	const TL2CapFecNegotiator&			iFecNegotiator;
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	TOptionConfigStatus					iConfigStatus;
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	TRetransmissionAndFlowControlOption iPeer;
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	TRetransmissionAndFlowControlOption iPreferred;
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	};
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NONSHARABLE_CLASS(TL2CapIncomingFecNegotiator) : public TL2CapSingleDirectionFecNegotiatorBase
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	{
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public:
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	inline TL2CapIncomingFecNegotiator(const TL2CapFecNegotiator& aFecNegotiator);
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	void ProcessPeerValue(const TRetransmissionAndFlowControlOption& aFecOption,
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						  TBool aIsUnacceptableParameters);
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	void ProcessImplicitPeerValue();
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	void DowngradeToBasic();
0
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    void Setup();
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protected:
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    void BuildRequest(TL2CapChannelMode aMode, TRetransmissionAndFlowControlOption& aFecOption);
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	};
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NONSHARABLE_CLASS(TL2CapOutgoingFecNegotiator) : public TL2CapSingleDirectionFecNegotiatorBase
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	{
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public:
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	inline TL2CapOutgoingFecNegotiator(const TL2CapFecNegotiator& aFecNegotiator);
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	TInt ProcessPeerValue(const TRetransmissionAndFlowControlOption& aFecOption);
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    void Setup();	
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	inline TBool NeedToIncludeInPositiveConfigResponse();
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	inline void SetIncludeInPositiveConfigResponse(TBool aVal);
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private:
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	TBool iIncludeValueInPositiveConfigResponse;
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	};
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// This is the interface to the FEC option negotiation functionality, through which
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// all interaction with the external world should be done.
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NONSHARABLE_CLASS(TL2CapFecNegotiator)
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	{
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public:
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	// Variants of the negotiation procedure defined in 2.1 Core Spec Addendum 1,
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	// chapter 5.4 Retransmission And Flow Control Option.
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	enum TNegotiationBehavior
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		{
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		// Allows all spec-allowed fallback options: Streaming -> ERTM, ERTM -> Basic and
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		// Streaming -> Basic. E.g. if our preferred mode is ERTM and peer proposes Basic,
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		// we'll fall back to it. The negotiation procedure is a simple minimization
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		// algorithm, where the party with the higher-precedence mode wins.
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		// Also note that we try to apply the same hierarchy to RTM and FC, so effectively
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		// you can read this as Unreliable -> Reliable, Reliable -> Basic and Unreliable -> Basic,
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		// where Reliable = { ERTM, RTM } and Unreliable = { Streaming, FC }
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		// For the precedence of modes, see channel mode <= operator or the spec, same section.
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		EState1,
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		// Like State1, only Unreliable -> Reliable is not allowed (Unreliable -> Basic and
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		// Reliable -> Basic still are).
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		EState1NoUnreliableToReliable,
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		// No fallback - disconnect immediately if peer proposes a different channel mode than
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		// we want.
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		EState2
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		};
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public:
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	inline TL2CapFecNegotiator();
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	TBool Setup(TL2CapConfig::TChannelReliability aChannelReliability,
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				TBool aLegacyModesDisallowed,
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				const TL2CapEntityInfo& aPeerEntityConfig,
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				TUint8 aMaxTransmit);
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	// Can't renegotiate FEC currently but with Generic AMP time-outs will be renegotiable.
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	void SetupForRenegotiation();
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	// Methods below implement events in option state machine - they're identical
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	// to the ones in the generic state machine in TL2CapConfigurationOptionGroup.
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	inline TInt PeerRequestsOption(const TRetransmissionAndFlowControlOption& aFecOption);
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	inline TInt PeerRequestsLastAcceptedValue();
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	inline TInt PeerRejectsOption(const TRetransmissionAndFlowControlOption& aFecOption);
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	inline TInt PeerAcceptsOption(const TRetransmissionAndFlowControlOption& aFecOption);
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	inline void PeerAcceptsOption();
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	inline TBool NeedToIncludeInPositiveConfigResponse();
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	void DowngradeIncomingToBasicIfOutgoingIsBasic();
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	TInt CheckNegotiatedChannelMode(TBool& aDowngrade);
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	// [Methods below add a lot of fluff but they provide strong decoupling and encapsulation.
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	// None of the internal classes are exposed.]
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	inline const TRetransmissionAndFlowControlOption& IncomingPreferred() const;
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	inline const TRetransmissionAndFlowControlOption& OutgoingPreferred() const;
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	inline TL2CapConfigurationOptionGroupBase::TOptionConfigStatus IncomingConfigOptionStatus() const;
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	inline TL2CapConfigurationOptionGroupBase::TOptionConfigStatus OutgoingConfigOptionStatus() const;
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	inline TL2CapDataControllerConfig DataControllerConfig() const;
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	// These abstract away the fact that some parameters are negotiated in opposite paths depending
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	// on the modes used (eg Monitor TO), and which fields the values should be taken from (Peer or
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	// Preferred).
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	inline TL2CapChannelMode OutgoingLinkMode() const;
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	inline TL2CapChannelMode IncomingLinkMode() const;
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	inline TUint8 OutgoingLinkModeAsUnsignedByte() const;
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	inline TUint8 IncomingLinkModeAsUnsignedByte() const;
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	inline TUint8 OutgoingTxWindowSize() const;
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	inline TUint8 IncomingTxWindowSize() const;
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	inline TUint8 OutgoingMaxTransmit() const;
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	inline TUint8 IncomingMaxTransmit() const;
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	inline TUint16 OutgoingRetransmissionTimeout() const;
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	inline TUint16 IncomingRetransmissionTimeout() const;
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	inline TUint16 OutgoingMonitorTimeout() const;
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	inline TUint16 IncomingMonitorTimeout() const;
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	inline TUint16 OutgoingMaximumPDUSize() const;
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	inline TUint16 IncomingMaximumPDUSize() const;
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	// These are for the internal per-direction negotiator objects.
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	TBool IsModeLegal(TL2CapChannelMode aPeerMode) const;
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	inline const TL2CapEntityInfo& PeerSupportedModes() const;
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	inline TNegotiationBehavior NegotiationBehavior() const;
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	inline TL2CapChannelMode DesiredMode() const;
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    inline TUint8 MaxTransmit() const;	
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	inline const TFecOptionHandlerDelegator& ModeSpecificHandlers() const;
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private:
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	TL2CapIncomingFecNegotiator		iIncomingNegotiator;
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	TL2CapOutgoingFecNegotiator		iOutgoingNegotiator;
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	TL2CapEntityInfo				iPeerSupportedModes;
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	TNegotiationBehavior			iNegotiationBehavior;
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	TL2CapChannelMode				iDesiredMode;
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    TUint8                          iMaxTransmit;
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	TFecOptionHandlerDelegator		iModeSpecificHandlers;
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	};
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#include "L2CapFecNegotiator.inl"
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#endif /*L2CAPFECNEGOTIATOR_H*/