// 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:

// Implements the adding and removal of tag headers.

// 

//

/**

 @file

*/

#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS

#include "IPTagHeader.h"

#include "Constants.h"

/**

Default constructor. 

*/

	{

	iHeaderByte.SetMax();

	iHeaderByte.FillZ();

	}

/**

Default destructor.

*/

CIPTagHeader::~CIPTagHeader()

	{

	}

/**

This method will set the type of the IP header.

@param aType IP header type

*/

void CIPTagHeader::SetType(TUint16 aType)

 	{

 	iHeaderByte[0] = (TUint8)(aType>>8); 

 	iHeaderByte[1] = (TUint8)(aType&0xff);	

	}

/**

This method will add a two-byte header to the send buffer detailing the

protocol the aDes data packet is encoded with; in this case an IPv4

header tag is appended.

@param aPdu The data packet to be sent

*/

void CIPTagHeader::AddHeader(RCommsBufChain& aPdu)

	{

	// Add the protocol code as a header to the buffer

	aPdu.Write(iHeaderByte,0);	

	}

/**

This method will remove the two-byte header from the received data,

which specifies whether it is an IPv4/IPv6 packet.  This information

will be stored in protocolCode and returned to the caller.

@param aPdu The received data packet

@return The protocol header tag stripped from aPdu

*/

TUint16 CIPTagHeader::RemoveHeader(RCommsBufChain& aPdu)

	{

	if (aPdu.Length() > KIPTagHeaderLength)

		{

		//Strip off the first part of the header

		aPdu.TrimStart(1);

		//Read the remaining part of the header as this contains the protocol code

		TUint8* payloadPtr = aPdu.First()->Ptr();

		TUint16 protocolCode = static_cast<TUint16>(*payloadPtr);

		//Strip off the remaining protocol code part of the header

		aPdu.TrimStart(1);

		return protocolCode;

		}

	return 0;

	}

#endif // RAWIP_HEADER_APPENDED_TO_PACKETS