/*

 * 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