/*

* Copyright (c) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Definitions needed for one "stream" of CDunTransporter

*

*/

/*

 * TODO: When local media is of type RComm, listening on it is started with

 * RComm::NotifyDataAvailable() call. Check that USB ACM port and Irda RCOMM

 * (and any other new media in the future) behaves correctly so that when

 * RComm::ReadOneOrMore() is issued, the read is issued immediately without

 * checking for new data. If waiting for new data happens in this

 * NotifyDataAvailable/ReadOneOrMore combination, raise a defect to Symbian.

 */

#include "DunTransporter.h"

#include "DunUpstream.h"

#include "DunDebug.h"

// ---------------------------------------------------------------------------

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

CDunUpstream* CDunUpstream::NewL( MDunTransporterUtilityAux* aUtility )

    {

    CDunUpstream* self = new (ELeave) CDunUpstream( aUtility );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// ---------------------------------------------------------------------------

// Destructor.

// ---------------------------------------------------------------------------

//

CDunUpstream::~CDunUpstream()

    {

    FTRACE(FPrint( _L("CDunUpstream::~CDunUpstream()" )));

    ResetData();

    FTRACE(FPrint( _L("CDunUpstream::~CDunUpstream() complete" )));

    }

// ---------------------------------------------------------------------------

// Resets data to initial values

// ---------------------------------------------------------------------------

//

void CDunUpstream::ResetData()

    {

    // APIs affecting this:

    // IssueRequest()

    Stop();

    // InitializeForAtParsing()

    delete iParseData.iAtCmdHandler;

    iParseData.iAtCmdHandler = NULL;

    // AddConnMonCallbackL()

    iCallbacksR.Close();

    iCallbacksW.Close();

    // AddSkippedErrorL()

    iOkErrorsR.Close();

    iOkErrorsW.Close();

    // Internal

    Initialize();

    }

// ---------------------------------------------------------------------------

// Sets activity callback for this stream

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::SetActivityCallback(

    MDunActivityManager* aActivityCallback )

    {

    if ( !aActivityCallback )

        {

        FTRACE(FPrint( _L("CDunUpstream::SetActivityCallback() (aActivityCallback) not initialized!" ) ));

        return KErrGeneral;

        }

    if ( iActivityData.iActivityCallback )

        {

        FTRACE(FPrint( _L("CDunUpstream::SetActivityCallback() (already exists) complete" ) ));

        return KErrAlreadyExists;

        }

    iActivityData.iActivityCallback = aActivityCallback;

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// Initializes this stream for AT command notifications

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::InitializeForAtParsing(

    MDunStreamManipulator* aStreamCallback,

    const TDesC8* aConnectionName,

    MDunCmdModeMonitor* aCallbackUp,

    MDunCmdModeMonitor* aCallbackDown )

    {

    FTRACE(FPrint( _L("CDunUpstream::InitializeForAtParsing()" ) ));

    if ( iParseData.iAtCmdHandler )

        {

        FTRACE(FPrint( _L("CDunUpstream::InitializeForAtParsing() (already exists) complete" ) ));

        return KErrAlreadyExists;

        }

    TInt retTrap = KErrNone;

    CDunAtCmdHandler* atCmdHandler = NULL;

    TRAP( retTrap, atCmdHandler = CDunAtCmdHandler::NewL(this,

                                                         aStreamCallback,

                                                         aConnectionName) );

    if ( retTrap != KErrNone )

        {

        FTRACE(FPrint( _L("CDunUpstream::InitializeForAtParsing() (trapped!) complete" ) ));

        return retTrap;

        }

    // Note: the order of the added callbacks is important. When a mode change

    // occurs, it is best to do the most important stuff with the first callback

    // object and after this cleanups with the second. Example: Data mode start

    // should stop command handling; first callback stops command handling,

    // second callback stops multiplexer (doing this differently could cause the

    // multiplexer to re-activate).

    atCmdHandler->AddCmdModeCallback( aCallbackUp );

    atCmdHandler->AddCmdModeCallback( aCallbackDown );

    iParseData.iDataMode = EFalse;

    iParseData.iAtCmdHandler = atCmdHandler;

    FTRACE(FPrint( _L("CDunUpstream::InitializeForAtParsing() complete" ) ));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// Starts upstream by issuing read request

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::StartStream()

    {

    FTRACE(FPrint( _L("CDunUpstream::StartStream()" ) ));

    if ( !iNetwork )

        {

        FTRACE(FPrint( _L("CDunUpstream::StartStream() (iNetwork) not initialized!" ) ));

        return KErrGeneral;

        }

    if ( !iComm && !iSocket )

        {

        FTRACE(FPrint( _L("CDunUpstream::StartStream() (iComm&iSocket) not initialized!" ) ));

        return KErrGeneral;

        }

    iOperationType = EDunOperationTypeRead;

    TInt retVal = IssueRequest();

    FTRACE(FPrint( _L("CDunUpstream::StartStream() complete" ) ));

    return retVal;

    }

// ---------------------------------------------------------------------------

// Stops transfer for read or write endpoints

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::Stop()

    {

    FTRACE(FPrint( _L("CDunUpstream::Stop() (Dir=%d)" ), iDirection));

    // Don't stop CDunAtCmdHandler here as it is downstream related!

    Cancel();

    iOperationType = EDunOperationTypeUndefined;

    // Notify parent about inactivity

    if ( iActivityData.iActivityCallback && iActivityData.iNotified )

        {

        iActivityData.iActivityCallback->NotifyChannelInactivity();

        iActivityData.iNotified = EFalse;

        }

    FTRACE(FPrint( _L("CDunUpstream::Stop() complete" )));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// Data transmission state (if read completed)

// ---------------------------------------------------------------------------

//

TBool CDunUpstream::DataReadStatus()

    {

    return iActivityData.iDataRead;

    }

// ---------------------------------------------------------------------------

// CDunUpstream::CDunUpstream

// ---------------------------------------------------------------------------

//

CDunUpstream::CDunUpstream( MDunTransporterUtilityAux* aUtility ) :

    iUtility( aUtility )

    {

    Initialize();

    }

// ---------------------------------------------------------------------------

// CDunUpstream::ConstructL

// ---------------------------------------------------------------------------

//

void CDunUpstream::ConstructL()

    {

    FTRACE(FPrint( _L("CDunUpstream::ConstructL()" ) ));

    if ( !iUtility )

        {

        User::Leave( KErrGeneral );

        }

    FTRACE(FPrint( _L("CDunUpstream::ConstructL() complete" ) ));

    }

// ---------------------------------------------------------------------------

// Initializes this class

// ---------------------------------------------------------------------------

//

void CDunUpstream::Initialize()

    {

    // Don't initialize iUtility here (it is set through NewL)

    iActivityData.iActivityCallback = NULL;

    iActivityData.iDataRead = EFalse;

    iActivityData.iNotified = EFalse;

    iParseData.iDataMode = EFalse;

    iParseData.iAtCmdHandler = NULL;

    }

// ---------------------------------------------------------------------------

// Issues transfer request for this stream

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::IssueRequest()

    {

    // Set direction

    iDirection = static_cast<TDunDirection>( EDunStreamTypeUpstream | iOperationType );

    FTRACE(FPrint( _L("CDunUpstream::IssueRequest() (Dir=%d)" ), iDirection));

        {

        FTRACE(FPrint( _L("CDunUpstream::IssueRequest() (not ready) complete" ) ));

        return KErrNotReady;

        }

    if ( iOperationType == EDunOperationTypeRead )

        {

        iBufferPtr->SetLength( iBufferPtr->MaxLength() );

        FTRACE(FPrint( _L("CDunUpstream::IssueRequest() trying to read %d bytes... (Dir=%d)" ), iBufferPtr->Length(), iDirection));

        }

    else // iOperationType == EDunOperationTypeWrite

        {

        FTRACE(FPrint( _L("CDunUpstream::IssueRequest() writing %d bytes... (Dir=%d)" ), iBufferPtr->Length(), iDirection));

        }

    switch ( iDirection )

        {

        case EDunReaderUpstream:

            if ( iComm )

                {

                iComm->ReadOneOrMore( iStatus, *iBufferPtr );

                SetActive();

                FTRACE(FPrint( _L("CDunUpstream::IssueRequest() RComm ReadOneOrMore() requested" ) ));

                }

            else if ( iSocket )

                {

                iSocket->RecvOneOrMore( *iBufferPtr, 0, iStatus, iReadLengthSocket );

                SetActive();

                FTRACE(FPrint( _L("CDunUpstream::IssueRequest() RSocket RecvOneOrMore() requested" ) ));

                }

            else

                {

                FTRACE(FPrint( _L("CDunUpstream::IssueRequest() (ERROR) complete" ) ));

                return KErrGeneral;

                }

            break;

        case EDunWriterUpstream:

            iNetwork->Write( iStatus, *iBufferPtr );

            SetActive();

            FTRACE(FPrint( _L("CDunUpstream::IssueRequest() RComm Write() requested" ) ));

            break;

        default:

            FTRACE(FPrint( _L("CDunUpstream::IssueRequest() (ERROR) complete" ) ));

            return KErrGeneral;

        }

    FTRACE(FPrint( _L("CDunUpstream::IssueRequest() (Dir=%d) complete" ), iDirection));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// Processes data that was read

// ---------------------------------------------------------------------------

//

TBool CDunUpstream::ProcessReadData()

    {

    FTRACE(FPrint( _L("CDunUpstream::ProcessReadData()" )));

    // The following will be transferred to Dataport

    if ( iParseData.iDataMode )

        {

        iOperationType = EDunOperationTypeWrite;

        FTRACE(FPrint( _L("CDunUpstream::ProcessReadData() (next write) complete" )));

        return ETrue;

        }

    if ( !iParseData.iAtCmdHandler )  // optional

        {

        FTRACE(FPrint( _L("CDunUpstream::ProcessReadData() (no handler) complete" )));

        return ETrue;

        }

    // The following will be transferred to parser

    TInt retTemp = KErrNone;

    TBool moreNeeded = EFalse;

    retTemp = iParseData.iAtCmdHandler->AddDataForParsing( *iBufferPtr,

                                                           moreNeeded );

    if ( retTemp!=KErrNone || !moreNeeded )

        {

        // If error or no error but no more data needed, don't reissue

        FTRACE(FPrint( _L("CDunUpstream::ProcessReadData() (no reissue) complete" )));

        return EFalse;

        }

    // If no error and more data needed, reissue

    FTRACE(FPrint( _L("CDunUpstream::ProcessReadData() (reissue) complete" )));

    return ETrue;

    }

// ---------------------------------------------------------------------------

// Manages activity in a channel

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::ManageChannelActivity()

    {

    FTRACE(FPrint( _L("CDunUpstream::ManageChannelActivity()" )));

    if ( iActivityData.iDataRead )

        {

        FTRACE(FPrint( _L("CDunUpstream::ManageChannelActivity() (not ready) complete" )));

        return KErrNotReady;

        }

    iActivityData.iDataRead = ETrue;

    if ( iActivityData.iActivityCallback && !iActivityData.iNotified )

        {

        iActivityData.iActivityCallback->NotifyChannelActivity();

        iActivityData.iNotified = ETrue;

        }

    FTRACE(FPrint( _L("CDunUpstream::ManageChannelActivity() complete" )));

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// From class CActive.

// Gets called when endpoint data read/write complete

// ---------------------------------------------------------------------------

//

void CDunUpstream::RunL()

    {

    FTRACE(FPrint( _L("CDunUpstream::RunL() (Dir=%d)" ), iDirection));

    TBool isError;

    TInt retTemp = iStatus.Int();

    TInt stop = ProcessErrorCondition( retTemp, isError );

    if ( !stop )  // no real error detected -> continue

        {

        TBool reIssue = ETrue;

        if ( !isError )

            {

            if ( iOperationType == EDunOperationTypeRead )

                {

                ManageChannelActivity();

                reIssue = ProcessReadData();

                }  // if ( iOperationType == EDunOperationTypeRead )

            else // iOperationType == EDunOperationTypeWrite

                {

                iOperationType = EDunOperationTypeRead;

                }

            }  // if ( !isError )

        if ( reIssue )

            {

            IssueRequest();

            }

        }  // if ( !stop )

    else  // stop -> tear down connection

        {

        FTRACE(FPrint( _L("CDunUpstream::RunL() stop" )));

        TDunConnectionReason connReason;

        connReason.iReasonType = EDunReasonTypeRW;

        connReason.iContext = GetMediaContext( EDunStreamTypeUpstream );

        connReason.iSignalType = 0;

        connReason.iSignalHigh = EFalse;

        connReason.iDirection = iDirection;

        connReason.iErrorCode = retTemp;

        if ( iOperationType == EDunOperationTypeRead )

            {

            iUtility->DoNotifyConnectionNotOk( iComm,

                                               iSocket,

                                               connReason,

                                               iCallbacksR );

            }

        else  // iOperationType == EDunOperationTypeWrite

            {

            iUtility->DoNotifyConnectionNotOk( iComm,

                                               iSocket,

                                               connReason,

                                               iCallbacksW );

            }

        }  // else

    FTRACE(FPrint( _L("CDunUpstream::RunL() complete" )));

    }

// ---------------------------------------------------------------------------

// From class CActive.

// Gets called on cancel

// ---------------------------------------------------------------------------

//

void CDunUpstream::DoCancel()

    {

    FTRACE(FPrint( _L("CDunUpstream::DoCancel()" )));

    FTRACE(FPrint( _L("CDunUpstream::DoCancel() complete" )));

    }

// ---------------------------------------------------------------------------

// From class MDunAtCmdStatusReporter

// Notifies about parser's need to get more data

// ---------------------------------------------------------------------------

//

void CDunUpstream::NotifyParserNeedsMoreData()

    {

    FTRACE(FPrint( _L("CDunUpstream::NotifyParserNeedsMoreData()" )));

    if ( iOperationType != EDunOperationTypeRead )

        {

        FTRACE(FPrint( _L("CDunUpstream::NotifyParserNeedsMoreData() (not ready) complete" )));

        return;

        }

    IssueRequest();  // iOperationType must be read here (don't set)

    FTRACE(FPrint( _L("CDunUpstream::NotifyParserNeedsMoreData() complete" )));

    }

// ---------------------------------------------------------------------------

// From class MDunAtCmdStatusReporter

// Notifies about editor mode reply

// ---------------------------------------------------------------------------

//

void CDunUpstream::NotifyEditorModeReply( TBool aStart )

    {

    FTRACE(FPrint( _L("CDunUpstream::NotifyEditorModeReply()" )));

    if ( iParseData.iDataMode )

        {

        FTRACE(FPrint( _L("CDunUpstream::NotifyEditorModeReply() (not ready) complete" )));

        return;

        }

    // If start of editor mode then just reissue the read request

    // If continuation then echo and reissue the read request

    if ( aStart )

        {

        IssueRequest();

        FTRACE(FPrint( _L("CDunUpstream::NotifyEditorModeReply() (start) complete" )));

        return;

        }

    iParseData.iAtCmdHandler->SendEchoCharacter( iBufferPtr, this );

    FTRACE(FPrint( _L("CDunUpstream::NotifyEditorModeReply() complete" )));

    }

// ---------------------------------------------------------------------------

// From class MDunAtCmdHandler

// Starts URC message handling

// ---------------------------------------------------------------------------

//

TInt CDunUpstream::StartUrc()

    {

    FTRACE(FPrint( _L("CDunUpstream::StartUrc()" )));

    TInt retVal = KErrNone;

    if ( iParseData.iAtCmdHandler )  // optional

        {

        retVal = iParseData.iAtCmdHandler->StartUrc();

        }

    FTRACE(FPrint( _L("CDunUpstream::StartUrc() complete" )));

    return retVal;

    }

// ---------------------------------------------------------------------------

// From class MDunAtCmdHandler

// Stops AT command handling downstream related activity (also URC)

// ---------------------------------------------------------------------------

//

    {

    FTRACE(FPrint( _L("CDunUpstream::StopAtCmdHandling()" )));

    if ( iParseData.iAtCmdHandler )  // optional

        {

        }

    FTRACE(FPrint( _L("CDunUpstream::StopAtCmdHandling() complete" )));

    }

// ---------------------------------------------------------------------------

// From class MDunCmdModeMonitor.