/*

* Copyright (c) 2009 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:  IPProxy TCP protocol expression for opening phone side TCP

*                connection.

*

*/

// INCLUDE FILES

#include "CExprTCPOpen.h"

#include "CommRouterDefinitions.h"

#include "MExpressionObserverTCP.h"

#define DEBUG_FILENAME "IPProxyEngine.log"

#include "DebugPrint.h"

// ============================ MEMBER FUNCTIONS ===============================

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

// CExprTCPOpen::CExprTCPOpen

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

//

CExprTCPOpen::CExprTCPOpen( MExpressionObserverTCP* aObserver )

    : iObserver( aObserver )

    {

    __ASSERT_DEBUG( iObserver, User::Invariant() );

    }

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

// CExprTCPOpen::NewL

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

//

CExprTCPOpen* CExprTCPOpen::NewL( MExpressionObserverTCP* aObserver )

    {

    CExprTCPOpen* self = CExprTCPOpen::NewLC( aObserver );

    CleanupStack::Pop();

    return self;

    }

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

// CExprTCPOpen::NewLC

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

//

CExprTCPOpen* CExprTCPOpen::NewLC( MExpressionObserverTCP* aObserver )

    {

    CExprTCPOpen* self = new( ELeave ) CExprTCPOpen( aObserver );

    CleanupStack::PushL( self );

    return self;

    }

// Destructor

CExprTCPOpen::~CExprTCPOpen()

    {

    }

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

// CExprTCPOpen::HandleReceivedDataL()

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

//

TBool CExprTCPOpen::HandleRecievedMsgL( TDes8& aData, TInt& aStartPos, TInt& aLength )

    {

    // Check if the prefix matches

    aStartPos = aData.Find( KTCPOpenPrefix );

    if ( aStartPos != KErrNotFound  )

        {

        // Found a matching prefix

        // Let the observer know

        iObserver->FrameStarted();

        TPtr8 dataToParse( aData.MidTPtr( aStartPos ) );

        TInt err = TryParsingL( dataToParse, aLength );

        if ( err != KErrNone )

            {

            // corrupted data in the frame

            iObserver->ProtocolErrorL( err, aData );

            // delete the corrupted data

            aData.SetLength( 0 );

            }

        return ETrue;

        }

    else

        {

        return EFalse;

        }

    }

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

// CExprTCPOpen::TryParsingL

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

//

TInt CExprTCPOpen::TryParsingL( TDes8& aData, TInt& aLength )

    {

    __ASSERT_ALWAYS( aData.Left( KTCPOpenPrefix().Length() ) == KTCPOpenPrefix,

        User::Panic( _L("Protocol"), 1 ) );

    // TCP_OPEN:0123

    TInt frameOverhead =

        KTCPOpenPrefix().Length() +

        KHexDecimalLength;

    if ( aData.Length() >= frameOverhead )

        {

        TPtrC8 portPtr(

            aData.Mid( KTCPOpenPrefix().Length(), KHexDecimalLength ) );

        TLex8 portLexer( portPtr );

        TUint port;

        if ( portLexer.Val( port, EHex ) != KErrNone )

            {

            return KErrCorrupt;

            }

        // send parsed results

        iObserver->OpenLocalTCPConnectionL( port );

        aLength = frameOverhead;

        return KErrNone;

        }

    return KErrNone;

    }

//  End of File