/*

* 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 "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:  Exif file format parser ( reader ) class

*

*/

#ifndef EXIFREAD_H

#define EXIFREAD_H

//  INCLUDES

#include <e32base.h>

// CONSTANTS

// MACROS

// DATA TYPES

enum TExifIfdType

    {

	EIfd0 = 0,

	EIfdExif,

	EIfd1,

	EIfdGps,

	EIfdIntOp

    };

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class CExifTag;

// CLASS DECLARATION

/**

* CExifRead

* Interface class for parsing Exif v2.2 file format. An instance of this class 

* can be instantiated providing valid Exif data. 

*

* @lib ExifLib

* @since 2.6 

*/

NONSHARABLE_CLASS( CExifRead ): public CBase

    {

    public:  // Enumerations

        enum TExifReadOption

        {

	    ENoOptions          = 0x0000, // Original, safe full parsing

	    ENoJpeg             = 0x0001, // No main JPEG included, no parsing for main image

	    EFastJpegParsing    = 0x0002, // Fast JPEG marker parsing

	    ENoTagChecking      = 0x0004  // Ignore unknown EXIF tags and mandatory tag checking

        };

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        */

    	IMPORT_C static CExifRead* NewL( const TDesC8& aExifData );

    	IMPORT_C static CExifRead* NewL( const TDesC8& aExifData, TUint aExifReadOption );

        /**

        * Destructor.

        */

    	virtual ~CExifRead();

    public: // New functions

        /**

        * Returns the Tag instance, which has the specified ID from the 

        * requested IFD.

        * @since 2.6

        * @param aIfdType The hosting IFD type

        * @param aTagId The queried tag ID.

        * @return Unmodifiable tag instance returned.

        */

    	virtual const CExifTag* GetTagL( 

            TExifIfdType aIfdType, 

            TUint16 aTagId ) const = 0;

        /**

        * Returns the IDs of all the tags that are stored in the Exif data.

        * @since 2.6

        * @param aIfdType The hosting IFD type.

        * @param aNoTags Number of tag IDs returned.

        * @return Pointer to the tag IDs.

        */

    	virtual TUint16* GetTagIdsL( 

            TExifIfdType aIfdType, 

            TInt& aNoTags ) const = 0;

        /**

        * Returns the types of the IFDs stored in the Exif data.

        * @since 2.6

        * @param aNoIfd Number of IFD types returned.

        * @return Pointer to the IFD types.

        */

    	virtual TExifIfdType* GetIfdTypesL( TInt& aNoIfd ) const = 0;

        /**

        * Returns pointer to a copy of the thumbnail image data.

        * @since 2.6

        * @return Pointer to the descriptor containing a copy of the 

        * Exif thumbnail image.

        */

    	virtual HBufC8* GetThumbnailL() const = 0;

        /**

        * Returns a boolean stating if the queried IFD structure exists in the 

        * Exif data.

        * @since 2.6

        * @param aIfdType The queried IFD type.

        * @return Boolean stating if the specified IFD exists or not.

        */

    	virtual TBool IfdExists( TExifIfdType aIfdType ) const = 0;

        /**

        * Returns a boolean stating if the queried tag exists in the specified 

        * IFD structure.

        * @since 2.6

        * @param aTagId Queried tag ID.

        * @param aIfdType The hosting IFD type.

        * @return Boolean stating if the specified tag exists or not.

        */

    	virtual TBool TagExists( 

            TUint16 aTagId, 

            TExifIfdType aIfdType ) const = 0;

        /**

        * Gets the Image Description tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Image 

        * Description data.

        */

    	virtual HBufC8* GetImageDescriptionL() const = 0;

        /**

        * Gets the Make tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Make data.

        */

    	virtual HBufC8* GetMakeL() const = 0;

        /**

        * Gets the Model tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Model data.

        */

        virtual HBufC8* GetModelL() const = 0;

        /**

        * Gets the Transfer Function tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Transfer 

        * Function data.

        */

        virtual HBufC8* GetTransferFunctionL() const = 0; 

        /**

        * Gets the Date Time tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Date Time 

        * data.

        */

        virtual HBufC8* GetDateTimeL() const = 0; 

        /**

        * Gets the Software tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Software 

        * data.

        */

        virtual HBufC8* GetSoftwareL() const = 0; 

        /**

        * Gets the Copyright tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Copyright 

        * data.

        */

        virtual HBufC8* GetCopyrightL() const = 0; 

        /**

        * Gets the Orientation tag data.

        * @since 2.6

        * @param aOrientation Returned Orientation data.

        * @return Error code.

        */

    	virtual TInt GetOrientation( TUint16& aOrientation ) const = 0;

        /**

        * Gets the X Resolution tag data.

        * @since 2.6

        * @param aXResolution1 Returned X Resolution numerator.

        * @param aXResolution2 Returned X Resolution denominator.

        * @return Error code. 

        */

        virtual TInt GetXResolution( 

            TUint32& aXResolution1, 

            TUint32& aXResolution2 ) const = 0;

        /**

        * Gets the Y Resolution tag data.

        * @since 2.6

        * @param aYResolution1 Returned Y Resolution numerator.

        * @param aYResolution2 Returned Y Resolution denominator.

        * @return Error code.

        */

        virtual TInt GetYResolution( 

            TUint32& aYResolution1, 

            TUint32& aYResolution2 ) const = 0;

        /**

        * Gets the Resolution Unit tag data.

        * @since 2.6

        * @param aResolutionUnit Returned Resolution Unit data.

        * @return Error code. 

        */

        virtual TInt GetResolutionUnit( TUint16& aResolutionUnit ) const = 0; 

        /**

        * Gets the YCbCr Positioning tag data.

        * @since 2.6

        * @param aYCbCrPositioning Returned YCbCr Positioning data.

        * @return Error code.

        */

        virtual TInt GetYCbCrPositioning( 

            TUint16& aYCbCrPositioning ) const = 0; 

        /**

        * Gets the Exif Ifd Pointer tag data.

        * @since 2.6

        * @param aExifIfdPointer Returned Exif Ifd Pointer data.

        * @return Error code.

        */

        virtual TInt GetExifIfdPointer( TUint32& aExifIfdPointer ) const = 0; 

        /**

        * Gets the Gps Info Ifd Pointer tag data.

        * @since 2.6

        * @param aGpsInfoIfdPointer Returned Gps Info Ifd Pointer data.

        * @return Error code.

        */

        virtual TInt GetGpsInfoIfdPointer( 

            TUint32& aGpsInfoIfdPointer ) const = 0; 

        /**

        * Gets the Iso Speed Ratings tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Iso Speed 

        * Ratings data.

        */

    	virtual HBufC8* GetIsoSpeedRatingsL() const = 0; 

        /**

        * Gets the Date Time Original tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Date Time 

        * Original data.

        */

        virtual HBufC8* GetDateTimeOriginalL() const = 0;

        /**

        * Gets the Date Time Digitized tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Date Time 

        * Digitized data.

        */

        virtual HBufC8* GetDateTimeDigitizedL() const = 0; 

    	/**

        * Gets the Maker Note tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Maker Note 

        * data.

        */

        virtual HBufC8* GetMakerNoteL() const = 0; 

        /**

        * Gets the User Comment tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the User 

        * Comment data.

        */

        virtual HBufC8* GetUserCommentL() const = 0; 

        /**

        * Gets the Related Sound File tag data.

        * @since 2.6

        * @return Pointer to the descriptor containing copy of the Related 

        * Sound File data.

        */

        virtual HBufC8* GetRelatedSoundFileL() const = 0; 

        /**

        * Gets the Exposure Time tag data.

        * @since 2.6

        * @param ExposureTime Returned Exposure Time data.

        * @return Error code.

        */

    	virtual TInt GetExposureTime( 

            TUint32& aExposureTime1, 

            TUint32& aExposureTime2 ) const = 0; 

        /**

        * Gets the Components Configuration tag data.

        * @since 2.6

        * @param aComponentsConfiguration Returned Components Configuration 

        * data.

        * @return Error code.

        */

        virtual TInt GetComponentsConfiguration( 

            TUint8& aFirstComponent, TUint8& aSecondComponent,

            TUint8& aThirdComponent, TUint8& aFourthComponent) const = 0; 

        /**

        * Gets the Flash tag data.

        * @since 2.6

        * @param aFlash Returned Flash data.

        * @return Error code.

        */

        virtual TInt GetFlash( TUint16& aFlash ) const = 0; 

        /**

        * Gets the ColorSpace tag data.

        * @since 2.6

        * @param aColorSpace Returned ColorSpace data.

        * @return Error code.

        */

        virtual TInt GetColorSpace( TUint16& aColorSpace ) const = 0; 

        /**

        * Gets the Pixel X Dimension tag data.

        * @since 2.6

        * @param aPixelXDimension Returned Pixel X Dimension data.

        * @return Error code.

        */

        virtual TInt GetPixelXDimension( TUint32& aPixelXDimension ) const = 0; 

        /**

        * Gets the Pixel Y Dimension tag data.

        * @since 2.6

        * @param aPixelYDimension Returned Pixel Y Dimension data.

        * @return Error code.

        */

        virtual TInt GetPixelYDimension( TUint32& aPixelYDimension ) const = 0; 

        /**

        * Gets the Exposure Mode tag data.

        * @since 2.6

        * @param aExposureMode Returned Exposure Mode data.

        * @return Error code.

        */

        virtual TInt GetExposureMode( TUint16& aExposureMode ) const = 0; 

        /**

        * Gets the White Balance tag data.

        * @since 2.6

        * @param aWhiteBalance Returned White Balance data.

        * @return Error code.

        */

        virtual TInt GetWhiteBalance( TUint16& aWhiteBalance ) const = 0; 

        /**

        * Gets the Scene Capture Type tag data.

        * @since 2.6

        * @param aSceneCaptureType Returned Scene Capture Type data.

        * @return Error code.

        */

        virtual TInt GetSceneCaptureType( 

            TUint16& aSceneCaptureType ) const = 0; 

        /**

        * Gets the Exposure Program tag data.

        * @since 2.6

        * @param aExposureProgram Returned Exposure Program data.

        * @return Error code.

        */

        virtual TInt GetExposureProgram( TUint16& aExposureProgram ) const = 0;

        /**

        * Gets the Aperture Value tag data.

        * @since 2.6

        * @param aApertureValue1 Returned Aperture Value numerator.

        * @param aApertureValue2 Returned Aperture Value denominator.

        * @return Error code.

        */

        virtual TInt GetApertureValue( 

            TUint32& aApertureValue1, 

            TUint32& aApertureValue2 ) const = 0; 

        /**

        * Gets the Exposure Bias Value tag data.

        * @since 2.6

        * @param aExposureBiasValue1 Returned Exposure Bias Value numerator.

        * @param aExposureBiasValue1 Returned Exposure Bias Value denominator.

        * @return Error code.

        */

        virtual TInt GetExposureBiasValue( 

            TInt32& aExposureBiasValue1, 

            TInt32& aExposureBiasValue2 ) const = 0; 

        /**

        * Gets the Metering Mode tag data.

        * @since 2.6

        * @param aMeteringMode Returned Metering Mode data.

        * @return Error code.

        */

        virtual TInt GetMeteringMode( TUint16& aMeteringMode ) const = 0; 

        /**

        * Gets the Light Source tag data.

        * @since 2.6

        * @param aLightSource Returned Light Source data.

        * @return Error code.

        */

        virtual TInt GetLightSource( TUint16& aLightSource ) const = 0; 

        /**

        * Gets the File Source tag data.

        * @since 2.6

        * @param aFileSource Returned File Source data.

        * @return Error code.

        */

        virtual TInt GetFileSource( TInt8& aFileSource ) const = 0; 

        /**

        * Gets the Digital Zoom Ratio tag data.

        * @since 2.6

        * @param aDigitalZoomRatio1 Returned Digital Zoom Ratio numerator.

        * @param aDigitalZoomRatio2 Returned Digital Zoom Ratio denominator.

        * @return Error code.

        */

        virtual TInt GetDigitalZoomRatio( 

            TUint32& aDigitalZoomRatio1, 

            TUint32& aDigitalZoomRatio2 ) const = 0; 

        /**

        * Gets the Contrast tag data.

        * @since 2.6

        * @param aContrast Returned Contrast data.

        * @return Error code.

        */

        virtual TInt GetContrast( TUint16& aContrast ) const = 0; 

        /**

        * Gets the Saturation tag data.

        * @since 2.6

        * @param aSaturation Returned Saturation data.

        * @return Error code.

        */

        virtual TInt GetSaturation( TUint16& aSaturation ) const = 0; 

        /**

        * Gets the Sharpness tag data.

        * @since 2.6

        * @param aSharpness Returned Sharpness data.

        * @return Error code.

        */

        virtual TInt GetSharpness( TUint16& aSharpness ) const = 0; 

        /**

        * Gets the Exif Version tag data.

        * @since 2.6

        * @param aExifVersion Returned Exif Version data.

        * @return Error code.

        */

        virtual TInt GetExifVersion( TUint32& aExifVersion ) const = 0; 

        /**

        * Gets the Flash Pix Version tag data.

        * @since 2.6

        * @param aFlashPixVersion Returned Flash Pix Version data.

        * @return Error code.

        */

        virtual TInt GetFlashPixVersion( TUint32& aFlashPixVersion ) const = 0; 

        /**

        * Gets the Interoperability Ifd Pointer tag data.

        * @since 2.6

        * @param aInteroperabilityIfdPointer Returned Interoperability Ifd 

        * Pointer data.

        * @return Error code.

        */

        virtual TInt GetInteroperabilityIfdPointer( 

            TUint32& aInteroperabilityIfdPointer ) const = 0; 

        /**

        * Gets the thumbnail X Resolution tag data.

        * @since 2.6

        * @param aXResolution1 Returned thumbnail X Resolution numerator.

        * @param aXResolution1 Returned thumbnail X Resolution denominator.

        * @return Error code.

        */

    	virtual TInt GetThumbnailXResolution( 

            TUint32& aXResolution1, 

            TUint32& aXResolution2 ) const = 0;

        /**

        * Gets the thumbnail Y Resolution tag data.

        * @since 2.6

        * @param aYResolution1 Returned thumbnail Y Resolution numerator.

        * @param aYResolution1 Returned thumbnail Y Resolution denominator.

        * @return Error code.

        */        

        virtual TInt GetThumbnailYResolution( 

            TUint32& aYResolution1, 

            TUint32& aYResolution2 ) const = 0;

        /**

        * Gets the thumbnail Resolution Unit tag data.

        * @since 2.6

        * @param aResolutionUnit Returned thumbnail Resolution Unit data.

        * @return Error code.

        */