/*

* 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(_SIMPLE_CONFIG_TLV_HEADER_H_)

#define _SIMPLE_CONFIG_TLV_HEADER_H_

#include "eap_tools.h"

#include "eap_general_header_base.h"

#include "simple_config_attribute_type.h"

/** @file */

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

/// This class defines header of Attribute-Value Pairs.

/**

 * Here is a figure of header of Attribute-Value Pairs.

 * Value data follows simple_config_tlv_header_c.

 * @code

 *  TLV-header:

 *  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 

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

 * |       Attribute Type          |         Data Length           |

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

 * |         Data ... 

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

 * @endcode

 * 

 * @code

 * The fields of this header are:

 * 16-bits Attribute Type          This is a TLV type.

 * 16-bits Data Length;            This is a length field, the length (in bytes) of the following Data.

 * @endcode

 */

class EAP_EXPORT simple_config_tlv_header_c

: public eap_general_header_base_c

{

private:

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

	/// This is pointer to the tools class.

	abs_eap_am_tools_c * const m_am_tools;

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

protected:

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

	/// This is enumeration of offsets to data fields.

	enum offsets

	{

		m_tlv_type_offset = 0ul,                                     ///< This is offset to fags and tlv type 16-bit field.

		m_length_offset = m_tlv_type_offset+sizeof(u16_t), ///< This is offset to length 16-bit field.

		m_data_offset = m_length_offset+sizeof(u16_t),               ///< This is offset to data field.

	};

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

public:

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

	/**

	 * The destructor of the simple_config_tlv_header_c class does nothing.

	 */

	virtual ~simple_config_tlv_header_c();

	/**

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

	 */

	simple_config_tlv_header_c(

		abs_eap_am_tools_c * const tools);

	/**

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

	 */

	simple_config_tlv_header_c(

		abs_eap_am_tools_c * const tools,

		void * const header_begin,

		const u32_t header_buffer_length);

	/**

	 * This function returns the TLV type flag.

	 */

	simple_config_Attribute_Type_e get_tlv_type() const;

	/**

	 * This function returns the length of TLV (header+data).

	 */

	u32_t get_length() const;

	/**

	 * This function returns the data length of TLV.

	 */

	u16_t get_data_length() const;

	/**

	 * This function returns the header length of TLV.

	 */

	static u32_t get_header_length();

	/**

	 * This function returns pointer to the offset of data of TLV.

	 * @param offset is the offset of queried data in bytes.

	 * @param contignuous_bytes is the length of queried data in bytes.

	 */

	u8_t * get_data_offset(const u32_t offset, const u32_t contignuous_bytes) const;

	/**

	 * This function returns pointer to the offset of data of TLV.

	 * @param contignuous_bytes is the length of queried data in bytes.

	 */

	u8_t * get_data(const u32_t contignuous_bytes) const;

	/**

	 * This function return pointer to the next TLV header in the same buffer.

	 */

	u8_t * get_next_header() const;

	/**

	 * This function checks the header is valid.

	 */

	eap_status_e check_header() const;

	/**

	 * This function returns debug strings of the TLV type.

	 */

	eap_const_string get_tlv_type_string() const;

	/**

	 * This function sets the TLV type flag.

	 */

	void set_tlv_type(simple_config_Attribute_Type_e type);

	/**

	 * This function sets the TLV data length.

	 */

	void set_data_length(const u16_t p_length);

	/**

	 * This function resets the TLV header.

	 */

	void reset_header(const u16_t buffer_length);

	// 

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

}; // class simple_config_tlv_header_c

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

/// Macro traces payload type and data.

#define SIMPLE_CONFIG_TLV_TRACE_PAYLOAD(prefix, payload) \

	{ \

		EAP_TRACE_DEBUG( \

			m_am_tools, TRACE_FLAGS_DEFAULT|TRACE_TEST_VECTORS, \

			(EAPL("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - \n"))); \

		EAP_TRACE_DEBUG( \

			m_am_tools, TRACE_FLAGS_DEFAULT|TRACE_TEST_VECTORS, \

			(EAPL("- %s (0x%08x): TLV type 0x%08x=%s, data length 0x%04x.\n"), \

			prefix, (payload)->get_header_buffer((payload)->get_length()), \

			(payload)->get_tlv_type(), \

			(payload)->get_tlv_type_string(), (payload)->get_data_length())); \

		EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_DEFAULT|TRACE_TEST_VECTORS, \

			(EAPL("- data"), (payload)->get_data((payload)->get_data_length()), \

			(payload)->get_data_length())); \

		EAP_TRACE_DEBUG( \

			m_am_tools, TRACE_FLAGS_DEFAULT|TRACE_TEST_VECTORS, \

			(EAPL("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - \n"))); \

	}

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

#endif //#if !defined(_SIMPLE_CONFIG_TLV_HEADER_H_)

// End.