/*

* Copyright (c) 2003, 2004 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:  Exif tag wrapper 

*

*/

#ifndef EXIFTAG_H

#define EXIFTAG_H

//  INCLUDES

#include <e32base.h>

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class TExifTagInfo;

// CLASS DECLARATION

/**

*  Interface class for handling Exif Tags. 

*  This class is used to get tag data from an Exif image.

*  @lib ExifLib

*  @since 2.6 

*/

NONSHARABLE_CLASS( CExifTag ): public CBase

    {

	public:  // Enumerations

        /**

        * Tag Data type enumeration.

        */

    	enum TExifTagDataType

            {

        	ETagByte = 1,

        	ETagAscii = 2,

        	ETagShort = 3,

        	ETagLong = 4,

        	ETagRational = 5,

        	ETagUndefined = 7,

        	ETagSlong = 9,

        	ETagSrational = 10

            };

    public:

        /**

        * Destructor.

        */

        virtual ~CExifTag();

    public: // New functions

        /**

        * Duplicate constructor. Creates an exact copy instance of the tag.

        * @since 2.6 

        * @param 

        * @return An instance of this class including the same contents of 

        * this instance.

        */

     	virtual CExifTag* DuplicateL() const = 0;

        /**

        * Returns the informative fields of a tag.

        * @since 2.6 

        * @param 

        * @return TExifTagInfo structure including informative fields of a tag

        */

    	virtual TExifTagInfo TagInfo() const = 0;

        /**

        * Returns data contents of a tag

        * @since 2.6 

        * @param 

        * @return Unmodifiable pointer to tag data.

        */

    	virtual TPtrC8 Data() const = 0;

    };

class TExifTagInfo

    {    

    public:  // Constructors and destructor

        IMPORT_C TExifTagInfo( 

            TUint16 aTagId, 

            CExifTag::TExifTagDataType aDataType, 

            TUint32 aDataCount );

    public:     // Data

        // Tag ID

    	TUint16 iId;

        // Tag data type

    	CExifTag::TExifTagDataType iDataType;

        // Number of tag data elements (having tag data type).

    	TUint32 iDataCount;

    };

#endif      // EXIFTAG_H   

// End of File