/*

* Copyright (c) 2007 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:  Handle and parse dhcp server response message.

*

*/

#include "dhcppsylogging.h"          // For logging

#include "dhcpconstants.h"

#include "dhcpdataresponsepacket.h"

const TInt KLengthOverMCookie = 236;

const TInt KDhcpMessageEndOption = 255;

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

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

// TDhcpDataResponsePacket

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

//

TDhcpDataResponsePacket::TDhcpDataResponsePacket()

    {

    iXid = 0;

    }

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

// Parses the location information part from the DHCPv4 Inform message,

// Currently supported Options 123 and 99.

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

//

TInt TDhcpDataResponsePacket::ParseDHCPAck ()

    {

    TRACESTRING( "TDhcpDataResponsePacket::ParseDHCPAck" );

    TInt dataFound = KErrNotFound;

    if (Length() > KLengthOverMCookie)

        {

        TPtrC8 magicCookie (KDhcpMagicCookie, sizeof(KDhcpMagicCookie));

        //Locate the 'magic cookie' after which the option field begins

        TInt offset = Find( magicCookie );

        if (offset!=KErrNotFound)

            {

            offset += 4; // Skip the cookie

            while (iBuffer[offset] != KDhcpMessageEndOption )

                {

                TInt messageOption = iBuffer[offset];

                switch (messageOption)

                    {

                    case KDhcpMessageGeoSpatialCoordinates:

                        {

                        // Parse Option 123

                        TUint8 dataLength = iBuffer[offset+1];

                        iGeoConf = Mid( ( offset + 2 ), dataLength );

                        offset++;

                        offset += dataLength + 1;

                        dataFound = KErrNone;

                        }

                        break;

                    case KDhcpMessageCivicAddress:

                        {

                        // Parse Option 99

                        // GeoConfCivic can be of variable length

                        TUint8 dataLength = iBuffer[offset+1];

                        iCivicAddress = Mid( ( offset + 2 ), dataLength );

                        offset++;

                        offset += dataLength + 1;

                        dataFound = KErrNone;

                        }

                        break;

                    default:

                        {

                        offset++;

                        offset = offset + (iBuffer[offset]+1) ;

                        }

                        break;

                    }

                }

            }

        }

    return dataFound;

    }