/*

* 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(_TLS_RECORD_HEADER_H_)

#define _TLS_RECORD_HEADER_H_

#include "eap_tools.h"

#include "eap_header.h"

#include "eap_general_header_base.h"

/** @file */

/**

 * This is enumeration of TLS-versions.

 */

enum tls_version_e

{

	tls_version_illegal = 0x0000,

	tls_version_3_1     = 0x0301,

	tls_version_last    = 0x0301, ///< keep this same as the last acceptable version.

};

/**

 * This is enumeration of TLS-record protocols.

 */

enum tls_record_protocol_e

{

	tls_record_protocol_change_cipher_spec = (20), ///< This is change cipher spec.

	tls_record_protocol_alert = (21),              ///< This is alert.

	tls_record_protocol_handshake = (22),          ///< This is handshake.

	tls_record_protocol_application_data = (23),   ///< This is application data.

	tls_record_protocol_none = (255),              ///< This is initialization value. Meaning is no protocol selected.

};

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

/// This class defines header of TLS record.

/**

 * Here is a figure of header of TLS record.

 * TLS-record data follows tls_record_header_c.

 * @code

 *  TLS record-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 

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

 * | Protocol: aa  | Version: 3    | Version: 1    | Length: m     |

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

 * | Length: n     |                                                

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

 * @endcode

 * 

 * @code

 * The fields of this header are:

 * 8-bits  m_protocol; This is a TLS-protocol field.

 * 16-bits m_version;  This is a TLS-version.

 * 16-bits m_length;   This is a length field. The length (in bytes) of

 *                     the following TLSPlaintext.fragment (TLS-record data).

 *                     The length should not exceed 2^14.

 * @endcode

 * 

 */

class EAP_EXPORT tls_record_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:

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

	enum offsets

	{

		m_protocol_offset = 0ul,                           ///< This is offset of the protocol 8-bit field.

		m_version_offset = m_protocol_offset+sizeof(u8_t), ///< This is offset of the version 16-bit field.

		m_length_offset = m_version_offset+sizeof(u16_t),  ///< This is offset of the length 16-bit field.

		m_data_offset = m_length_offset+sizeof(u16_t),     ///< This is offset of the data of TLS-record.

	};

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

public:

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

	/// Destructor does nothing.

	virtual ~tls_record_header_c();

	/// Constructor initializes the class.

	tls_record_header_c(

		abs_eap_am_tools_c * const tools,

		void * const header_buffer,

		const u32_t header_buffer_length);

	/// This function returns protocol of the TLS-record.

	tls_record_protocol_e get_protocol() const;

	/// This function returns version of the TLS-record.

	tls_version_e get_version() const;

	/// This function returns data length of the TLS-record.

	/// The length (in bytes) of the following TLSPlaintext.fragment (TLS-record data). The length should not exceed 2^14.

	u16_t get_data_length() const;

	/// This function returns header length of the TLS-record. This includes only protocol, version and length fiels.

	static u32_t get_header_length();

	/// This function returns pointer to offset of the TLS-record data.

	/// @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 begin of the TLS-record data.

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

	u8_t * get_data(const u32_t contignuous_bytes) const;

	static eap_const_string get_tls_protocol_string(const tls_record_protocol_e protocol);

	/// This function returns debug strings of the TLS-protocol values.

	eap_const_string get_tls_protocol_string() const;

	/// This function sets the protocol of TLS-record.

	void set_protocol(tls_record_protocol_e protocol);

	/// This function sets the version of the TLS-record.

	void set_version(tls_version_e version);

	/// This function sets the data length of the TLS-record.

	void set_data_length(const u16_t p_length);

	/// This function resets the TLS-record header.

	void reset_header(

		const u16_t buffer_length,

		const tls_version_e version);

	/// This function checks the header is valid.

	eap_status_e check_header() const;

	// 

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

}; // class tls_record_header_c

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

#endif //#if !defined(_TLS_RECORD_HEADER_H_)

// End.