// 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

 // which accompanies this distribution, and is available

 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.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