1 /*

     2 * Copyright (c) 2003, 2004 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Exif tag wrapper 

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef EXIFTAG_H

    21 #define EXIFTAG_H

    22 

    23 //  INCLUDES

    24 #include <e32base.h>

    25 

    26 // CONSTANTS

    27 

    28 // MACROS

    29 

    30 // DATA TYPES

    31 

    32 // FUNCTION PROTOTYPES

    33 

    34 // FORWARD DECLARATIONS

    35 class TExifTagInfo;

    36 

    37 // CLASS DECLARATION

    38 

    39 /**

    40 *  Interface class for handling Exif Tags. 

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

    42 *  @lib ExifLib

    43 *  @since 2.6 

    44 */

    45 NONSHARABLE_CLASS( CExifTag ): public CBase

    46     {

    47 	public:  // Enumerations

    48 

    49         /**

    50         * Tag Data type enumeration.

    51         */

    52     	enum TExifTagDataType

    53             {

    54         	ETagByte = 1,

    55         	ETagAscii = 2,

    56         	ETagShort = 3,

    57         	ETagLong = 4,

    58         	ETagRational = 5,

    59         	ETagUndefined = 7,

    60         	ETagSlong = 9,

    61         	ETagSrational = 10

    62             };

    63 

    64     public:

    65         

    66         /**

    67         * Destructor.

    68         */

    69         virtual ~CExifTag();

    70 

    71     public: // New functions

    72         

    73         /**

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

    75         * @since 2.6 

    76         * @param 

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

    78         * this instance.

    79         */

    80      	virtual CExifTag* DuplicateL() const = 0;

    81 

    82         /**

    83         * Returns the informative fields of a tag.

    84         * @since 2.6 

    85         * @param 

    86         * @return TExifTagInfo structure including informative fields of a tag

    87         */

    88     	virtual TExifTagInfo TagInfo() const = 0;

    89 

    90         /**

    91         * Returns data contents of a tag

    92         * @since 2.6 

    93         * @param 

    94         * @return Unmodifiable pointer to tag data.

    95         */

    96     	virtual TPtrC8 Data() const = 0;

    97 

    98     };

    99 

   100 

   101 class TExifTagInfo

   102     {    

   103     public:  // Constructors and destructor

   104 

   105         IMPORT_C TExifTagInfo( 

   106             TUint16 aTagId, 

   107             CExifTag::TExifTagDataType aDataType, 

   108             TUint32 aDataCount );

   109     

   110     public:     // Data

   111 

   112         // Tag ID

   113     	TUint16 iId;

   114 

   115         // Tag data type

   116     	CExifTag::TExifTagDataType iDataType;

   117 

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

   119     	TUint32 iDataCount;

   120     };

   121 

   122 #endif      // EXIFTAG_H   

   123             

   124 // End of File