/*

* Copyright (c) 2001-2006 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 "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:  EAP and WLAN authentication protocols.

*

*/

#if !defined(_EAP_TLV_MESSAGE_DATA_H_)

#define _EAP_TLV_MESSAGE_DATA_H_

#include "eap_am_types.h"

#include "eap_tools.h"

#include "eap_array.h"

#include "eap_tlv_header.h"

/** @file */

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

/// This class defines message data composed of Attribute-Value Pairs (See eap_tlv_header_c).

/**

 * Here is a figure of message data composed of Attribute-Value Pairs (See eap_tlv_header_c).

 * Value data follows eap_tlv_message_data_c.

 * @code

 *  EAP-TLV-message data:

 *  0                   1                   2                   3   

 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                              Type                             |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                             Length = 8                        |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                              Value 1                          |

 * +-+-                                                         -+-+

 * |                                                               |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                              Type                             |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                             Length = 4                        |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                              Value 2                          |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                              Type                             |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                             Length = 4                        |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 * |                              Value 3                          |

 * +-+-                                                         -+-+

 * |                                                               |

 * +-+-                                                         -+-+

 * |                                                               |

 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 *

 * NOTE, the length of value could be anythin between 0 ... (2^32)-1.

 * Only the free memory limits the length of the value.

 * There are no padding between Attribute-Value Pairs.

 * The next Attribute-Value Pair starts exactly after the previous

 * Value of previous Attribute-Value Pair.

 * @endcode

 * 

 */

class EAP_EXPORT eap_tlv_message_data_c

{

private:

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

	abs_eap_am_tools_c * const m_am_tools;

	eap_variable_data_c m_message_data;

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

protected:

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

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

public:

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

	/**

	 * The destructor of the eap_tlv_message_data_c class does nothing.

	 */

	EAP_FUNC_IMPORT virtual ~eap_tlv_message_data_c();

	/**

	 * The constructor of the eap_tlv_message_data_c class simply initializes the attributes.

	 */

	EAP_FUNC_IMPORT eap_tlv_message_data_c(

		abs_eap_am_tools_c * const tools);

	/**

	 * This function should increase reference count.

	 */

	EAP_FUNC_IMPORT void object_increase_reference_count();

	/**

	 * This function should first decrease reference count

	 * and second return the remaining reference count.

	 * Reference count must not be decreased when it is zero.

	 */

	EAP_FUNC_IMPORT u32_t object_decrease_reference_count();

	/**

	 * This function returns the pointer to the data.

	 * Empty message return NULL pointer.

	 */

	EAP_FUNC_IMPORT void * get_message_data() const;

	/**

	 * This function returns the length of the data.

	 * Empty message return zero.

	 */

	EAP_FUNC_IMPORT u32_t get_message_data_length() const;

	EAP_FUNC_IMPORT eap_status_e allocate_message_data_buffer(

		const u32_t approximate_buffer_requirement);

	/**

	 * This function copies message data.

	 * Data must be formatted as EAP-TLV-message data.

	 */

	EAP_FUNC_IMPORT eap_status_e copy_message_data(

		const u32_t length,

		const void * const value);

	/**

	 * This function sets message data.

	 * Note the data is referenced not copied.

	 * Data must be formatted as EAP-TLV-message data.

	 */

	EAP_FUNC_IMPORT eap_status_e set_message_data(

		const u32_t length,

		const void * const value);

	/**

	 * This function adds data to message.

	 */

	EAP_FUNC_IMPORT eap_status_e add_message_data(

		const eap_tlv_type_t type,

		const u32_t length,

		const void * const data);

	/**

	 * This function adds array of data to message.

	 */

	EAP_FUNC_IMPORT eap_status_e add_message_data_array(

		const eap_tlv_type_t type,

		const u32_t length_of_each_data_block,

		eap_array_c<eap_variable_data_c> * const data_array);

	/**

	 * This function adds header of structured data to message.

	 */

	EAP_FUNC_IMPORT eap_status_e add_message_header(

		const eap_tlv_type_t type,

		const u32_t length);

	/**

	 * This function parses eap_tlv_header_c blocks from message to tlv_blocks.

	 */

	EAP_FUNC_IMPORT eap_status_e parse_message_data(

		eap_array_c<eap_tlv_header_c> * const tlv_blocks);

	/**

	 * Object must indicate it's validity.

	 * If object initialization fails this function must return false.

	 * @return This function returns the validity of this object.

	 */

	EAP_FUNC_IMPORT bool get_is_valid();

	/**

	 * This function allocates buffer to message of specified type.

	 * Function returns pointer to the value field of specified length.

	 */

	EAP_FUNC_IMPORT eap_status_e allocate_message_buffer(

		const eap_tlv_type_t type,

		const u32_t length,

		void * * const buffer);

	// 

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

}; // class eap_tlv_message_data_c

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

#endif //#if !defined(_EAP_TLV_MESSAGE_DATA_H_)

// End.