mtpfws/mtpfw/src/cmtpsession.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 18 Aug 2010 10:38:51 +0300
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Revision: 201031 Kit: 201033
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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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#include <mtp/mtpprotocolconstants.h>
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#include "cmtpsession.h"
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// Class constants.
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__FLOG_STMT(_LIT8(KComponent,"Session");)
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#ifdef _DEBUG
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/**
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CMTPSession panics
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*/
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_LIT(KMTPPanicCategory, "CMTPSession");
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enum TMTPPanicReasons
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    {
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    EMTPPanicBusy = 0,
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    EMTPPanicStraySignal = 1,
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    };
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LOCAL_C void Panic(TInt aReason)
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    {
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    User::Panic(KMTPPanicCategory, aReason);
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    }
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#endif //_DEBUG
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/**
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CMTPSession factory method. A pointer to the new CMTPSession instance is placed
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on the cleanup stack.
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@param aMTPId The session identifier assigned by the MTP connection on which 
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the session resides. 
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@param aUniqueId The session identifier assigned by the MTP data provider framework that 
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is unique across all active connections.
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@return Pointer to the new CMTPSession instance. Ownership IS transfered.
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@leave One of the system wide error codes.
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*/
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CMTPSession* CMTPSession::NewLC(TUint32 aMTPId, TUint aUniqueId)
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    {
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    CMTPSession* self = new(ELeave) CMTPSession(aMTPId, aUniqueId);
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    CleanupStack::PushL(self);
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    self->ConstructL();
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    return self;
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    }
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/**
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Destructor.
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*/ 
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CMTPSession::~CMTPSession()
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    {
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    __FLOG(_L8("~CMTPSession - Entry"));
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    iRoutingRegistrations.Close();
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    __FLOG(_L8("~CMTPSession - Exit"));
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    __FLOG_CLOSE;
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    }
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/**
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Provides the next expected TransactionID. Transaction IDs are assigned 
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in incremental sequence by the MTP initiator in the range 0x00000001 to
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0xFFFFFFFE.
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@return The next TransactionID expected on the session.
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*/
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TUint32 CMTPSession::ExpectedTransactionId() const
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    {
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    __FLOG(_L8("ExpectedTransactionId - Entry"));
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    __FLOG_VA((_L8("iExpectedTransactionId = 0x%08X"), iExpectedTransactionId));
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    __FLOG(_L8("ExpectedTransactionId - Exit")); 
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    return iExpectedTransactionId; 
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    }
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/**
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Increments the next expected TransactionID to the next value in the sequence.
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TransactionIDs are assigned by the MTP initiator starting from 0x00000001. 
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When the TransactionID increments to 0xFFFFFFFF it wraps back to 0x00000001.
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*/
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void CMTPSession::IncrementExpectedTransactionId()
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    {
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    __FLOG(_L8("IncrementExpectedTransactionId - Entry"));
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    if (++iExpectedTransactionId == KMTPTransactionIdLast)
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        {
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        iExpectedTransactionId = KMTPTransactionIdFirst;
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        }
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    __FLOG_VA((_L8("iExpectedTransactionId = 0x%08X"), iExpectedTransactionId));
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    __FLOG(_L8("IncrementExpectedTransactionId - Exit"));
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    }
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/**
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Sets or resets the session's active transaction request dataset. The active 
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transaction request dataset should only be set at the start of the transaction 
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(ERequestPhase), and reset and the end of the transaction (ECompletingPhase).
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@param aRequest The active transaction request dataset.
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*/
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void CMTPSession::SetActiveRequestL(const TMTPTypeRequest& aRequest)
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    {
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    __FLOG(_L8("SetActiveRequestL - Entry"));
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    MMTPType::CopyL(aRequest, iActiveRequest);    
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    __FLOG(_L8("SetActiveRequestL - Exit"));
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    }
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   118
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/**
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Sets the session's transaction phase state variable.
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@param aPhase The new transaction phase state value.
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*/
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void CMTPSession::SetTransactionPhase(TMTPTransactionPhase aPhase)
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    {
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    __FLOG(_L8("SetTransactionPhase - Entry"));
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    iTransactionPhase = aPhase;
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    __FLOG_VA((_L8("iTransactionPhase = 0x%08X"), iTransactionPhase));
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    __FLOG(_L8("SetTransactionPhase - Exit"));
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    }
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/**
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Provides the current MTP transaction state for the session.
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@return The MTP transaction state for the session.
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*/
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TMTPTransactionPhase CMTPSession::TransactionPhase() const
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    {
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    __FLOG(_L8("TransactionPhase - Entry"));
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    __FLOG_VA((_L8("iTransactionPhase = 0x%08X"), iTransactionPhase));
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    __FLOG(_L8("TransactionPhase - Exit"));
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	return  iTransactionPhase;
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    }
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TInt CMTPSession::RouteRequest(const TMTPTypeRequest& aRequest)
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    {
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    __FLOG(_L8("RouteRequest - Entry"));
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    TInt ret(KErrNotFound);
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    // Attempt to match the request to existing registrations.
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    TInt idx(iRoutingRegistrations.FindInOrder(aRequest, CMTPSession::RouteRequestOrder));
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    if (idx != KErrNotFound)
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        {
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        // Retrieve the request registration.
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        const TMTPTypeRequest& registration(iRoutingRegistrations[idx]);
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        /*
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        Extract the registered DP ID. For convenience the DP ID is saved in 
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        the registered request, in the TransactionID element (which is unused 
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        for routing).
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        */  
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        ret = registration.Uint32(TMTPTypeRequest::ERequestTransactionID);
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        /* 
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        Recognised follow-on request types match one request occurence 
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        and are then deleted.
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        */
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        TUint16 op(aRequest.Uint16(TMTPTypeRequest::ERequestOperationCode));
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        if ((op == EMTPOpCodeSendObject) ||
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            (op == EMTPOpCodeTerminateOpenCapture))
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            {
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            __FLOG_VA((_L8("Unregistering follow-on request 0x%08X"), op));
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            iRoutingRegistrations.Remove(idx);
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            }
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        }
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    __FLOG_VA((_L8("DP ID = %d"), ret));
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    __FLOG(_L8("RouteRequest - Exit"));
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    return ret;
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    }
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   180
  
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void CMTPSession::RouteRequestRegisterL(const TMTPTypeRequest& aRequest, TInt aDpId)
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    {
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    __FLOG(_L8("RouteRequestRegisterL - Entry"));
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    // Locate any pre-existing registration (which if found, will be overwritten).
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    TInt idx(iRoutingRegistrations.FindInOrder(aRequest, CMTPSession::RouteRequestOrder));
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    if (idx == KErrNotFound)
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        {
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        iRoutingRegistrations.InsertInOrderL(aRequest, CMTPSession::RouteRequestOrder);
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        User::LeaveIfError(idx = iRoutingRegistrations.FindInOrder(aRequest, CMTPSession::RouteRequestOrder));
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        }
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   191
    
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    /*
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    For convenience the DP ID is saved in the registered request, in the 
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    TransactionID element (which is unused for routing).
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   195
    */
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    iRoutingRegistrations[idx].SetUint32(TMTPTypeRequest::ERequestTransactionID, aDpId);
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    __FLOG(_L8("RouteRequestRegisterL - Exit"));
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   198
    }
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   199
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   200
/**
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   201
Indicates if a routing request is registered on the session with the 
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specified MTP operation code.
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@param aOpCode The MTP operation code.
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@return ETrue if a routing request with the specified MTP operation code is 
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registered on the session, otherwise EFalse.
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*/
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TBool CMTPSession::RouteRequestRegistered(TUint16 aOpCode) const
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    {
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   209
    __FLOG(_L8("RouteRequestPending - Entry"));
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    __FLOG(_L8("RouteRequestPending - Entry"));
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    return (iRoutingRegistrations.Find(aOpCode, CMTPSession::RouteRequestMatchOpCode) != KErrNotFound);
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   212
    }
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   213
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void CMTPSession::RouteRequestUnregister(const TMTPTypeRequest& aRequest)
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    {
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    __FLOG(_L8("RouteRequestUnregister - Entry"));
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    TInt idx(iRoutingRegistrations.FindInOrder(aRequest, CMTPSession::RouteRequestOrder));
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    if (idx != KErrNotFound)
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   219
        {
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        iRoutingRegistrations.Remove(idx);
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   221
        }
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    __FLOG(_L8("RouteRequestUnregister - Exit"));
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    }
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void CMTPSession::StorePendingEventL(const TMTPTypeEvent& aEvent)
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    {
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    MMTPType::CopyL(aEvent, iPendingEvent);
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    }
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TBool CMTPSession::CheckPendingEvent(const TMTPTypeRequest& aRequest) const
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    {
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    TBool ret = EFalse;
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    // Compare transaction ID in the request and any pending event
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    if ( aRequest.Uint32(TMTPTypeRequest::ERequestTransactionID)  
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         == iPendingEvent.Uint32(TMTPTypeEvent::EEventTransactionID) )
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        {
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        ret = ETrue;
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        }
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    return ret;
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    }
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const TMTPTypeEvent& CMTPSession::PendingEvent() const
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    {
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    return iPendingEvent;
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    }
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/**
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Completes the currently pending asynchronous request status with the specified
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completion code.
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@param aErr The asynchronous request completion request.
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*/
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void CMTPSession::CompletePendingRequest(TInt aErr)
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    {
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    __FLOG(_L8("CompletePendingRequest - Entry"));
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    if (iRequestStatus != NULL)
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        {
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        __ASSERT_DEBUG(*iRequestStatus == KRequestPending, Panic(EMTPPanicStraySignal));
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        User::RequestComplete(iRequestStatus, aErr);
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        }
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    __FLOG(_L8("CompletePendingRequest - Exit"));
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    }
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/**
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Indicates if an asynchronous request is currently pending.
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@return ETrue if an asynchronous request is currently pending, otherwise 
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EFalse.
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*/
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TBool CMTPSession::RequestPending() const
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    {
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    return (iRequestStatus != NULL);        
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    }
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/**
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Set the status to complete for the currently pending asynchronous request.
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@param aStatus The asynchronous request status to complete.
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*/
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void CMTPSession::SetRequestPending(TRequestStatus& aStatus)
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    {
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    __FLOG(_L8("SetRequestPending - Entry"));
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    __ASSERT_DEBUG(!iRequestStatus, Panic(EMTPPanicBusy));
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    iRequestStatus = &aStatus;
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    *iRequestStatus = KRequestPending;
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    __FLOG(_L8("SetRequestPending - Exit"));
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    }
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const TMTPTypeRequest& CMTPSession::ActiveRequestL() const
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    {
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    __FLOG(_L8("ActiveRequestL - Entry"));
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    if (iTransactionPhase == EIdlePhase)
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        {
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        User::Leave(KErrNotFound);            
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        }
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    __FLOG(_L8("ActiveRequestL - Exit"));
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    return iActiveRequest;  
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    }
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TUint32 CMTPSession::SessionMTPId() const
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    {
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    __FLOG(_L8("SessionMTPId - Entry"));
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    __FLOG_VA( (_L8("Session MTP ID = %d"), iIdMTP) );
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    __FLOG(_L8("SessionMTPId - Exit"));
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    return iIdMTP;        
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    }
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TUint CMTPSession::SessionUniqueId() const
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    {
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    __FLOG(_L8("SessionUniqueId - Entry"));
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    __FLOG(_L8("SessionUniqueId - Exit"));
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    return iIdUnique;        
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    }
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TAny* CMTPSession::GetExtendedInterface(TUid /*aInterfaceUid*/)
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    {
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    __FLOG(_L8("GetExtendedInterface - Entry"));
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    __FLOG(_L8("GetExtendedInterface - Exit"));
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    return NULL;        
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    }
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   325
    
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/**
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Constructor.
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*/
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CMTPSession::CMTPSession(TUint32 aMTPId, TUint aUniqueId) :
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    iExpectedTransactionId(KMTPTransactionIdFirst),
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    iIdMTP(aMTPId),
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    iIdUnique(aUniqueId),
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    iRequestStatus(NULL)
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   334
    {
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   335
    
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    }
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   337
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void CMTPSession::ConstructL()
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    {
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    __FLOG_OPEN(KMTPSubsystem, KComponent);
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    __FLOG(_L8("ConstructL - Entry"));
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    __FLOG(_L8("ConstructL - Exit"));
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    }
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TBool CMTPSession::RouteRequestMatchOpCode(const TUint16* aOpCode, const TMTPTypeRequest& aRequest)
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    {
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    return (aRequest.Uint16(TMTPTypeRequest::ERequestOperationCode) == *aOpCode);
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    }
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   349
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TInt CMTPSession::RouteRequestOrder(const TMTPTypeRequest& aLeft, const TMTPTypeRequest& aRight)
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    {
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    TInt unequal(aLeft.Uint16(TMTPTypeRequest::ERequestOperationCode) - aRight.Uint16(TMTPTypeRequest::ERequestOperationCode));
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    if (!unequal)
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        {
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        for (TUint i(TMTPTypeRequest::ERequestParameter1); ((i <= TMTPTypeRequest::ERequestParameter5) && (!unequal)); i++)
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            {
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            unequal = aLeft.Uint32(i) - aRight.Uint32(i);
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            }
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        }
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    return unequal;
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    }