// Copyright (c) 2004-2009 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:

// udp_hdr.h - UDP header structure

// Defines the basic classes for accessing the header

// structures within UDP packets.

//

/**

 @file udp_hdr.h

 @ingroup ip_packet_formats

 @publishedAll

 @released

*/

#ifndef __UDP_HDR_H__

#define __UDP_HDR_H__

#include <e32def.h>

#include "in_hdr.h"

/**

* @addtogroup ip_packet_formats

* @{

*/

// TInet6HeaderUPD

class TInet6HeaderUDP

	/** UDP Header format.

    * User Datagram Header Format

	* @verbatim

Extract from RFC-768

     0      7 8     15 16    23 24    31  

    +--------+--------+--------+--------+ 

    |     Source      |   Destination   | 

    |      Port       |      Port       | 

    +--------+--------+--------+--------+ 

    |                 |                 | 

    |     Length      |    Checksum     | 

    +--------+--------+--------+--------+ 

    |                                     

    |          data octets ...            

    +---------------- ...                 

@endverbatim

	* @publishedAll

	* @released

	*/

	{

public:

	inline TInt HeaderLength() const {return 8;}

	inline static TInt MinHeaderLength() {return 8; }

	inline static TInt MaxHeaderLength() {return 8; }

	inline TUint8 *EndPtr() {return i + HeaderLength();}

	//

	// Access, Get UDP field values from the packet

	//

	inline TUint SrcPort() const

		{

		return (i[0] << 8) + i[1];

		}

	inline TUint DstPort() const

		{

		return (i[2] << 8) + i[3];

		}

	inline TInt Length() const

		{

		return (i[4] << 8) + i[5];

		}

	inline TInt Checksum() const

		{

		// Checksum is used in network byte order

		return *((TUint16 *)&i[6]);

		}

	//

	// Build, Set UDP field value to the packet

	//

	inline void SetSrcPort(TUint aPort)

		{

		i[0] = (TUint8)(aPort >> 8);

		i[1] = (TUint8)aPort;

		}

	inline void SetDstPort(TUint aPort)

		{

		i[2] = (TUint8)(aPort >> 8);

		i[3] = (TUint8)aPort;

		}

	inline void SetLength(TInt aLength)

		{

		i[4] = (TUint8)(aLength / 256);

		i[5] = (TUint8) aLength;

		}

	inline void SetChecksum(TInt aSum)

		{

		// Checksum is used in network byte order

		*((TUint16 *)&i[6]) = (TUint16)aSum;

		}

private:

	TUint8 i[8];

	};

/** @} */

#endif