/*

* 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 implementation

*

*/

#ifndef EXIFREADIMPL_H

#define EXIFREADIMPL_H

//  INCLUDES

#include "ExifRead.h"

#include "ExifValueTable.h"

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class CExifEndianBase;

class CExifCore;

// CLASS DECLARATION

/**

* CExifReadImpl

* Implementation 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( CExifReadImpl ): public CExifRead

    {

	public: // Constructors and destructor

        /**

        * Two-phased constructor.

        */

    	static CExifReadImpl* NewL( const TDesC8& aExifData, TBool aCreate, TUint aExifReadOption );

        /**

        * Two-phased constructor.

        */

    	static CExifReadImpl* NewL();

        /**

        * Destructor.

        */

        virtual ~CExifReadImpl();

	public:  // Functions from base classes

        /**

        * From CExifRead. 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.

        */

    	const CExifTag* GetTagL( TExifIfdType aIfdType, TUint16 aTagId ) const;

        /**

        * From CExifRead. 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.

        */

    	TUint16* GetTagIdsL( TExifIfdType aIfdType, TInt& aNoTags ) const;

        /**

        * From CExifRead. 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.

        */

    	TExifIfdType* GetIfdTypesL( TInt& aNoIfd ) const;

        /**

        * From CExifRead. 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.

        */

    	HBufC8* GetThumbnailL() const;

        /**

        * From CExifRead. 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.

        */

    	TBool IfdExists( TExifIfdType aIfdType ) const;

        /**

        * From CExifRead. 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.

        */

    	TBool TagExists( TUint16 aTagId, TExifIfdType aIfdType ) const;

        /**

        * From CExifRead. Gets the Image Description tag data.

        * @since 2.6

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

        * Description data.

        */

    	HBufC8* GetImageDescriptionL() const;

        /**

        * From CExifRead. Gets the Make tag data.

        * @since 2.6

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

        */

    	HBufC8* GetMakeL() const;

        /**

        * From CExifRead. Gets the Model tag data.

        * @since 2.6

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

        */

        HBufC8* GetModelL() const;

        /**

        * From CExifRead. Gets the Transfer Function tag data.

        * @since 2.6

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

        * Function data.

        */

        HBufC8* GetTransferFunctionL() const; 

        /**

        * From CExifRead. Gets the Date Time tag data.

        * @since 2.6

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

        * data.

        */

        HBufC8* GetDateTimeL() const; 

        /**

        * From CExifRead. Gets the Software tag data.

        * @since 2.6

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

        * data.

        */

        HBufC8* GetSoftwareL() const; 

        /**

        * From CExifRead. Gets the Copyright tag data.

        * @since 2.6

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

        * data.

        */

        HBufC8* GetCopyrightL() const; 

        /**

        * From CExifRead. Gets the Orientation tag data.

        * @since 2.6

        * @param aOrientation Returned Orientation data.

        * @return Error code.

        */

    	TInt GetOrientation( TUint16& aOrientation ) const;

        /**

        * From CExifRead. Gets the X Resolution tag data.

        * @since 2.6

        * @param aXResolution1 Returned X Resolution numerator.

        * @param aXResolution2 Returned X Resolution denominator.

        * @return Error code. 

        */

        TInt GetXResolution( 

            TUint32& aXResolution1, 

            TUint32& aXResolution2 ) const;

        /**

        * From CExifRead. Gets the Y Resolution tag data.

        * @since 2.6

        * @param aYResolution1 Returned Y Resolution numerator.

        * @param aYResolution2 Returned Y Resolution denominator.

        * @return Error code.

        */

        TInt GetYResolution( 

            TUint32& aYResolution1, 

            TUint32& aYResolution2 ) const;

        /**

        * From CExifRead. Gets the Resolution Unit tag data.

        * @since 2.6

        * @param aResolutionUnit Returned Resolution Unit data.

        * @return Error code. 

        */

        TInt GetResolutionUnit( TUint16& aResolutionUnit ) const; 

        /**

        * From CExifRead. Gets the YCbCr Positioning tag data.

        * @since 2.6

        * @param aYCbCrPositioning Returned YCbCr Positioning data.

        * @return Error code.

        */

        TInt GetYCbCrPositioning( TUint16& aYCbCrPositioning ) const; 

        /**

        * From CExifRead. Gets the Exif Ifd Pointer tag data.

        * @since 2.6

        * @param aExifIfdPointer Returned Exif Ifd Pointer data.

        * @return Error code.

        */

        TInt GetExifIfdPointer( TUint32& aExifIfdPointer ) const; 

        /**

        * From CExifRead. Gets the Gps Info Ifd Pointer tag data.

        * @since 2.6

        * @param aGpsInfoIfdPointer Returned Gps Info Ifd Pointer data.

        * @return Error code.

        */

        TInt GetGpsInfoIfdPointer( TUint32& aGpsInfoIfdPointer ) const; 

        /**

        * From CExifRead. Gets the Iso Speed Ratings tag data.

        * @since 2.6

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

        * Ratings data.

        */

    	HBufC8* GetIsoSpeedRatingsL() const; 

        /**

        * From CExifRead. Gets the Date Time Original tag data.

        * @since 2.6

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

        * Original data.

        */

        HBufC8* GetDateTimeOriginalL() const;

        /**

        * From CExifRead. Gets the Date Time Digitized tag data.

        * @since 2.6

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

        * Digitized data.

        */

        HBufC8* GetDateTimeDigitizedL() const; 

    	/**

        * From CExifRead. Gets the Maker Note tag data.

        * @since 2.6

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

        * data.

        */

        HBufC8* GetMakerNoteL() const; 

        /**

        * From CExifRead. Gets the User Comment tag data.

        * @since 2.6

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

        * data.

        */

        HBufC8* GetUserCommentL() const; 

        /**

        * From CExifRead. Gets the Related Sound File tag data.

        * @since 2.6

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

        * Sound File data.

        */

        HBufC8* GetRelatedSoundFileL() const; 

        /**

        * From CExifRead. Gets the Exposure Time tag data.

        * @since 2.6

        * @param ExposureTime Returned Exposure Time data.

        * @return Error code.

        */

    	TInt GetExposureTime( 

            TUint32& aExposureTime1, 

            TUint32& aExposureTime2 ) const; 

        /**

        * From CExifRead. Gets the Components Configuration tag data.

        * @since 2.6

        * @param aComponentsConfiguration Returned Components Configuration 

        * data.

        * @return Error code.

        */

        TInt GetComponentsConfiguration( 

            TUint8& aFirstComponent, TUint8& aSecondComponent,

            TUint8& aThirdComponent, TUint8& aFourthComponent) const; 

        /**

        * From CExifRead. Gets the Flash tag data.

        * @since 2.6

        * @param aFlash Returned Flash data.

        * @return Error code.

        */

        TInt GetFlash( TUint16& aFlash ) const; 

        /**

        * From CExifRead. Gets the ColorSpace tag data.

        * @since 2.6

        * @param aColorSpace Returned ColorSpace data.

        * @return Error code.

        */

        TInt GetColorSpace( TUint16& aColorSpace ) const; 

        /**

        * From CExifRead. Gets the Pixel X Dimension tag data.

        * @since 2.6

        * @param aPixelXDimension Returned Pixel X Dimension data.

        * @return Error code.

        */

        TInt GetPixelXDimension( TUint32& aPixelXDimension ) const; 

        /**

        * From CExifRead. Gets the Pixel Y Dimension tag data.

        * @since 2.6

        * @param aPixelYDimension Returned Pixel Y Dimension data.

        * @return Error code.

        */

        TInt GetPixelYDimension( TUint32& aPixelYDimension ) const; 

        /**

        * From CExifRead. Gets the Exposure Mode tag data.

        * @since 2.6

        * @param aExposureMode Returned Exposure Mode data.

        * @return Error code.

        */

        TInt GetExposureMode( TUint16& aExposureMode ) const; 

        /**

        * From CExifRead. Gets the White Balance tag data.

        * @since 2.6

        * @param aWhiteBalance Returned White Balance data.

        * @return Error code.

        */

        TInt GetWhiteBalance( TUint16& aWhiteBalance ) const; 

        /**

        * From CExifRead. Gets the Scene Capture Type tag data.

        * @since 2.6

        * @param aSceneCaptureType Returned Scene Capture Type data.

        * @return Error code.

        */

        TInt GetSceneCaptureType( TUint16& aSceneCaptureType ) const; 

        /**

        * From CExifRead. Gets the Exposure Program tag data.

        * @since 2.6

        * @param aExposureProgram Returned Exposure Program data.

        * @return Error code.

        */

        TInt GetExposureProgram( TUint16& aExposureProgram ) const;

        /**

        * From CExifRead. Gets the Aperture Value tag data.

        * @since 2.6

        * @param aApertureValue1 Returned Aperture Value numerator.

        * @param aApertureValue2 Returned Aperture Value denominator.

        * @return Error code.

        */

        TInt GetApertureValue( 

            TUint32& aApertureValue1, 

            TUint32& aApertureValue2 ) const; 

        /**

        * From CExifRead. 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.

        */

        TInt GetExposureBiasValue( 

            TInt32& aExposureBiasValue1, 

            TInt32& aExposureBiasValue2 ) const; 

        /**

        * From CExifRead. Gets the Metering Mode tag data.

        * @since 2.6

        * @param aMeteringMode Returned Metering Mode data.

        * @return Error code.

        */

        TInt GetMeteringMode( TUint16& aMeteringMode ) const; 

        /**

        * From CExifRead. Gets the Light Source tag data.

        * @since 2.6

        * @param aLightSource Returned Light Source data.

        * @return Error code.

        */

        TInt GetLightSource( TUint16& aLightSource ) const; 

        /**

        * From CExifRead. Gets the File Source tag data.

        * @since 2.6

        * @param aFileSource Returned File Source data.

        * @return Error code.

        */

        TInt GetFileSource( TInt8& aFileSource ) const; 

        /**

        * From CExifRead. 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.

        */

        TInt GetDigitalZoomRatio( 

            TUint32& aDigitalZoomRatio1, 

            TUint32& aDigitalZoomRatio2 ) const; 

        /**

        * From CExifRead. Gets the Contrast tag data.

        * @since 2.6

        * @param aContrast Returned Contrast data.

        * @return Error code.

        */

        TInt GetContrast( TUint16& aContrast ) const; 

        /**

        * From CExifRead. Gets the Saturation tag data.

        * @since 2.6

        * @param aSaturation Returned Saturation data.

        * @return Error code.

        */

        TInt GetSaturation( TUint16& aSaturation ) const; 

        /**

        * From CExifRead. Gets the Sharpness tag data.

        * @since 2.6

        * @param aSharpness Returned Sharpness data.

        * @return Error code.

        */

        TInt GetSharpness( TUint16& aSharpness ) const; 

        /**

        * From CExifRead. Gets the Exif Version tag data.

        * @since 2.6

        * @param aExifVersion Returned Exif Version data.

        * @return Error code.

        */

        TInt GetExifVersion( TUint32& aExifVersion ) const; 

        /**

        * From CExifRead. Gets the Flash Pix Version tag data.

        * @since 2.6

        * @param aFlashPixVersion Returned Flash Pix Version data.

        * @return Error code.

        */

        TInt GetFlashPixVersion( TUint32& aFlashPixVersion ) const; 

        /**

        * From CExifRead. Gets the Interoperability Ifd Pointer tag data.

        * @since 2.6

        * @param aInteroperabilityIfdPointer Returned Interoperability Ifd 

        * Pointer data.

        * @return Error code.

        */

        TInt GetInteroperabilityIfdPointer( 

            TUint32& aInteroperabilityIfdPointer ) const; 

        /**

        * From CExifRead. 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.

        */

    	TInt GetThumbnailXResolution( 

            TUint32& aXResolution1, 

            TUint32& aXResolution2 ) const;

        /**

        * From CExifRead. 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.

        */        

        TInt GetThumbnailYResolution( 

            TUint32& aYResolution1, 

            TUint32& aYResolution2 ) const;

        /**

        * From CExifRead. Gets the thumbnail Resolution Unit tag data.

        * @since 2.6

        * @param aResolutionUnit Returned thumbnail Resolution Unit data.

        * @return Error code.

        */            

        TInt GetThumbnailResolutionUnit( TUint16& aResolutionUnit ) const;

        /**

        * From CExifRead. Gets the thumbnail Compression tag data.

        * @since 2.6

        * @param aCompression Returned thumbnail Compression data.

        * @return Error code.

        */            

        TInt GetThumbnailCompression( TUint16& aCompression ) const; 

        /**

        * From CExifRead. Gets the thumbnail Jpeg Interchange Format tag data.

        * @since 2.6

        * @param aJpegInterchangeFormat Returned thumbnail Jpeg Interchange 

        * Format data.

        * @return Error code.

        */            

        TInt GetJpegInterchangeFormat( TUint32& aJpegInterchangeFormat ) const; 

        /**