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<?php
/**
 * Classe d'extraction de metadonnées afin de les mettre dans
 * un tableau au format du cel
 * Encodage en entrée : utf8
 * Encodage en sortie : utf8
 *
 * @author Aurélien PERONNET <aurelien@tela-botanica.org>
 * @author Jean-Pascal MILCENT <jpm@tela-botanica.org>
 * @license GPL v3 <http://www.gnu.org/licenses/gpl.txt>
 * @license CECILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt>
 * @version $Id$
 * @copyright © 2012, Tela Botanica
 */
class ExtracteurMetadonnees {

        private $meta = array();
        private $tableau_ids_tags_exif = array(
                        'InteropIndex' => '1',
                        'InteropVersion' => '2',
                        'ProcessingSoftware' => '11',
                        'SubfileType' => '254',
                        'OldSubfileType' => '255',
                        'ImageWidth' => '256',
                        'ImageHeight' => '257',
                        'BitsPerSample' => '258',
                        'Compression' => '259',
                        'PhotometricInterpretation' => '262',
                        'Thresholding' => '263',
                        'CellWidth' => '264',
                        'CellLength' => '265',
                        'FillOrder' => '266',
                        'DocumentName' => '269',
                        'ImageDescription' => '270',
                        'Make' => '271',
                        'Model' => '272',
                        'StripOffsets' => '273',
                        'Orientation' => '274',
                        'SamplesPerPixel' => '277',
                        'RowsPerStrip' => '278',
                        'StripByteCounts' => '279',
                        'MinSampleValue' => '280',
                        'MaxSampleValue' => '281',
                        'XResolution' => '282',
                        'YResolution' => '283',
                        'PlanarConfiguration' => '284',
                        'PageName' => '285',
                        'XPosition' => '286',
                        'YPosition' => '287',
                        'FreeOffsets' => '288',
                        'FreeByteCounts' => '289',
                        'GrayResponseUnit' => '290',
                        'GrayResponseCurve' => '291',
                        'T4Options' => '292',
                        'T6Options' => '293',
                        'ResolutionUnit' => '296',
                        'PageNumber' => '297',
                        'ColorResponseUnit' => '300',
                        'TransferFunction' => '301',
                        'Software' => '305',
                        'ModifyDate' => '306',
                        'Artist' => '315',
                        'HostComputer' => '316',
                        'Predictor' => '317',
                        'WhitePoint' => '318',
                        'PrimaryChromaticities' => '319',
                        'ColorMap' => '320',
                        'HalftoneHints' => '321',
                        'TileWidth' => '322',
                        'TileLength' => '323',
                        'TileOffsets' => '324',
                        'TileByteCounts' => '325',
                        'BadFaxLines' => '326',
                        'CleanFaxData' => '327',
                        'ConsecutiveBadFaxLines' => '328',
                        'SubIFD' => '330',
                        'InkSet' => '332',
                        'InkNames' => '333',
                        'NumberofInks' => '334',
                        'DotRange' => '336',
                        'TargetPrinter' => '337',
                        'ExtraSamples' => '338',
                        'SampleFormat' => '339',
                        'SMinSampleValue' => '340',
                        'SMaxSampleValue' => '341',
                        'TransferRange' => '342',
                        'ClipPath' => '343',
                        'XClipPathUnits' => '344',
                        'YClipPathUnits' => '345',
                        'Indexed' => '346',
                        'JPEGTables' => '347',
                        'OPIProxy' => '351',
                        'GlobalParametersIFD' => '400',
                        'ProfileType' => '401',
                        'FaxProfile' => '402',
                        'CodingMethods' => '403',
                        'VersionYear' => '404',
                        'ModeNumber' => '405',
                        'Decode' => '433',
                        'DefaultImageColor' => '434',
                        'T82Options' => '435',
                        'JPEGTables' => '437',
                        'JPEGProc' => '512',
                        'ThumbnailOffset' => '513',
                        'ThumbnailLength' => '514',
                        'JPEGRestartInterval' => '515',
                        'JPEGLosslessPredictors' => '517',
                        'JPEGPointTransforms' => '518',
                        'JPEGQTables' => '519',
                        'JPEGDCTables' => '520',
                        'JPEGACTables' => '521',
                        'YCbCrCoefficients' => '529',
                        'YCbCrSubSampling' => '530',
                        'YCbCrPositioning' => '531',
                        'ReferenceBlackWhite' => '532',
                        'StripRowCounts' => '559',
                        'ApplicationNotes' => '700',
                        'USPTOMiscellaneous' => '999',
                        'RelatedImageFileFormat' => '4096',
                        'RelatedImageWidth' => '4097',
                        'RelatedImageHeight' => '4098',
                        'Rating' => '18246',
                        'XP_DIP_XML' => '18247',
                        'StitchInfo' => '18248',
                        'RatingPercent' => '18249',
                        'ImageID' => '32781',
                        'WangTag1' => '32931',
                        'WangAnnotation' => '32932',
                        'WangTag3' => '32933',
                        'WangTag4' => '32934',
                        'Matteing' => '32995',
                        'DataType' => '32996',
                        'ImageDepth' => '32997',
                        'TileDepth' => '32998',
                        'Model2' => '33405',
                        'CFARepeatPatternDim' => '33421',
                        'CFAPattern2' => '33422',
                        'BatteryLevel' => '33423',
                        'KodakIFD' => '33424',
                        'Copyright' => '33432',
                        'ExposureTime' => '33434',
                        'FNumber' => '33437',
                        'MDFileTag' => '33445',
                        'MDScalePixel' => '33446',
                        'MDColorTable' => '33447',
                        'MDLabName' => '33448',
                        'MDSampleInfo' => '33449',
                        'MDPrepDate' => '33450',
                        'MDPrepTime' => '33451',
                        'MDFileUnits' => '33452',
                        'PixelScale' => '33550',
                        'AdventScale' => '33589',
                        'AdventRevision' => '33590',
                        'UIC1Tag' => '33628',
                        'UIC2Tag' => '33629',
                        'UIC3Tag' => '33630',
                        'UIC4Tag' => '33631',
                        'IPTC-NAA' => '33723',
                        'IntergraphPacketData' => '33918',
                        'IntergraphFlagRegisters' => '33919',
                        'IntergraphMatrix' => '33920',
                        'INGRReserved' => '33921',
                        'ModelTiePoint' => '33922',
                        'Site' => '34016',
                        'ColorSequence' => '34017',
                        'IT8Header' => '34018',
                        'RasterPadding' => '34019',
                        'BitsPerRunLength' => '34020',
                        'BitsPerExtendedRunLength' => '34021',
                        'ColorTable' => '34022',
                        'ImageColorIndicator' => '34023',
                        'BackgroundColorIndicator' => '34024',
                        'ImageColorValue' => '34025',
                        'BackgroundColorValue' => '34026',
                        'PixelIntensityRange' => '34027',
                        'TransparencyIndicator' => '34028',
                        'ColorCharacterization' => '34029',
                        'HCUsage' => '34030',
                        'TrapIndicator' => '34031',
                        'CMYKEquivalent' => '34032',
                        'SEMInfo' => '34118',
                        'AFCP_IPTC' => '34152',
                        'PixelMagicJBIGOptions' => '34232',
                        'ModelTransform' => '34264',
                        'WB_GRGBLevels' => '34306',
                        'LeafData' => '34310',
                        'PhotoshopSettings' => '34377',
                        'ExifOffset' => '34665',
                        'ICC_Profile' => '34675',
                        'TIFF_FXExtensions' => '34687',
                        'MultiProfiles' => '34688',
                        'SharedData' => '34689',
                        'T88Options' => '34690',
                        'ImageLayer' => '34732',
                        'GeoTiffDirectory' => '34735',
                        'GeoTiffDoubleParams' => '34736',
                        'GeoTiffAsciiParams' => '34737',
                        'ExposureProgram' => '34850',
                        'SpectralSensitivity' => '34852',
                        'GPSInfo' => '34853',
                        'ISO' => '34855',
                        'Opto-ElectricConvFactor' => '34856',
                        'Interlace' => '34857',
                        'TimeZoneOffset' => '34858',
                        'SelfTimerMode' => '34859',
                        'SensitivityType' => '34864',
                        'StandardOutputSensitivity' => '34865',
                        'RecommendedExposureIndex' => '34866',
                        'ISOSpeed' => '34867',
                        'ISOSpeedLatitudeyyy' => '34868',
                        'ISOSpeedLatitudezzz' => '34869',
                        'FaxRecvParams' => '34908',
                        'FaxSubAddress' => '34909',
                        'FaxRecvTime' => '34910',
                        'LeafSubIFD' => '34954',
                        'ExifVersion' => '36864',
                        'DateTimeOriginal' => '36867',
                        'CreateDate' => '36868',
                        'ComponentsConfiguration' => '37121',
                        'CompressedBitsPerPixel' => '37122',
                        'ShutterSpeedValue' => '37377',
                        'ApertureValue' => '37378',
                        'BrightnessValue' => '37379',
                        'ExposureCompensation' => '37380',
                        'MaxApertureValue' => '37381',
                        'SubjectDistance' => '37382',
                        'MeteringMode' => '37383',
                        'LightSource' => '37384',
                        'Flash' => '37385',
                        'FocalLength' => '37386',
                        'FlashEnergy' => '37387',
                        'SpatialFrequencyResponse' => '37388',
                        'Noise' => '37389',
                        'FocalPlaneXResolution' => '37390',
                        'FocalPlaneYResolution' => '37391',
                        'FocalPlaneResolutionUnit' => '37392',
                        'ImageNumber' => '37393',
                        'SecurityClassification' => '37394',
                        'ImageHistory' => '37395',
                        'SubjectArea' => '37396',
                        'ExposureIndex' => '37397',
                        'TIFF-EPStandardID' => '37398',
                        'SensingMethod' => '37399',
                        'CIP3DataFile' => '37434',
                        'CIP3Sheet' => '37435',
                        'CIP3Side' => '37436',
                        'StoNits' => '37439',
                        'MakerNoteCanon' => '37500',
                        'UserComment' => '37510',
                        'SubSecTime' => '37520',
                        'SubSecTimeOriginal' => '37521',
                        'SubSecTimeDigitized' => '37522',
                        'MSDocumentText' => '37679',
                        'MSPropertySetStorage' => '37680',
                        'MSDocumentTextPosition' => '37681',
                        'ImageSourceData' => '37724',
                        'XPTitle' => '40091',
                        'XPComment' => '40092',
                        'XPAuthor' => '40093',
                        'XPKeywords' => '40094',
                        'XPSubject' => '40095',
                        'FlashpixVersion' => '40960',
                        'ColorSpace' => '40961',
                        'ExifImageWidth' => '40962',
                        'ExifImageHeight' => '40963',
                        'RelatedSoundFile' => '40964',
                        'InteropOffset' => '40965',
                        'FlashEnergy' => '41483',
                        'SpatialFrequencyResponse' => '41484',
                        'Noise' => '41485',
                        'FocalPlaneXResolution' => '41486',
                        'FocalPlaneYResolution' => '41487',
                        'FocalPlaneResolutionUnit' => '41488',
                        'ImageNumber' => '41489',
                        'SecurityClassification' => '41490',
                        'ImageHistory' => '41491',
                        'SubjectLocation' => '41492',
                        'ExposureIndex' => '41493',
                        'TIFF-EPStandardID' => '41494',
                        'SensingMethod' => '41495',
                        'FileSource' => '41728',
                        'SceneType' => '41729',
                        'CFAPattern' => '41730',
                        'CustomRendered' => '41985',
                        'ExposureMode' => '41986',
                        'WhiteBalance' => '41987',
                        'DigitalZoomRatio' => '41988',
                        'FocalLengthIn35mmFormat' => '41989',
                        'SceneCaptureType' => '41990',
                        'GainControl' => '41991',
                        'Contrast' => '41992',
                        'Saturation' => '41993',
                        'Sharpness' => '41994',
                        'DeviceSettingDescription' => '41995',
                        'SubjectDistanceRange' => '41996',
                        'ImageUniqueID' => '42016',
                        'OwnerName' => '42032',
                        'SerialNumber' => '42033',
                        'LensInfo' => '42034',
                        'LensMake' => '42035',
                        'LensModel' => '42036',
                        'LensSerialNumber' => '42037',
                        'GDALMetadata' => '42112',
                        'GDALNoData' => '42113',
                        'Gamma' => '42240',
                        'ExpandSoftware' => '44992',
                        'ExpandLens' => '44993',
                        'ExpandFilm' => '44994',
                        'ExpandFilterLens' => '44995',
                        'ExpandScanner' => '44996',
                        'ExpandFlashLamp' => '44997',
                        'PixelFormat' => '48129',
                        'Transformation' => '48130',
                        'Uncompressed' => '48131',
                        'ImageType' => '48132',
                        'ImageWidth' => '48256',
                        'ImageHeight' => '48257',
                        'WidthResolution' => '48258',
                        'HeightResolution' => '48259',
                        'ImageOffset' => '48320',
                        'ImageByteCount' => '48321',
                        'AlphaOffset' => '48322',
                        'AlphaByteCount' => '48323',
                        'ImageDataDiscard' => '48324',
                        'AlphaDataDiscard' => '48325',
                        'OceScanjobDesc' => '50215',
                        'OceApplicationSelector' => '50216',
                        'OceIDNumber' => '50217',
                        'OceImageLogic' => '50218',
                        'Annotations' => '50255',
                        'PrintIM' => '50341',
                        'USPTOOriginalContentType' => '50560',
                        'DNGVersion' => '50706',
                        'DNGBackwardVersion' => '50707',
                        'UniqueCameraModel' => '50708',
                        'LocalizedCameraModel' => '50709',
                        'CFAPlaneColor' => '50710',
                        'CFALayout' => '50711',
                        'LinearizationTable' => '50712',
                        'BlackLevelRepeatDim' => '50713',
                        'BlackLevel' => '50714',
                        'BlackLevelDeltaH' => '50715',
                        'BlackLevelDeltaV' => '50716',
                        'WhiteLevel' => '50717',
                        'DefaultScale' => '50718',
                        'DefaultCropOrigin' => '50719',
                        'DefaultCropSize' => '50720',
                        'ColorMatrix1' => '50721',
                        'ColorMatrix2' => '50722',
                        'CameraCalibration1' => '50723',
                        'CameraCalibration2' => '50724',
                        'ReductionMatrix1' => '50725',
                        'ReductionMatrix2' => '50726',
                        'AnalogBalance' => '50727',
                        'AsShotNeutral' => '50728',
                        'AsShotWhiteXY' => '50729',
                        'BaselineExposure' => '50730',
                        'BaselineNoise' => '50731',
                        'BaselineSharpness' => '50732',
                        'BayerGreenSplit' => '50733',
                        'LinearResponseLimit' => '50734',
                        'CameraSerialNumber' => '50735',
                        'DNGLensInfo' => '50736',
                        'ChromaBlurRadius' => '50737',
                        'AntiAliasStrength' => '50738',
                        'ShadowScale' => '50739',
                        'SR2Private' => '50740',
                        'MakerNoteSafety' => '50741',
                        'RawImageSegmentation' => '50752',
                        'CalibrationIlluminant1' => '50778',
                        'CalibrationIlluminant2' => '50779',
                        'BestQualityScale' => '50780',
                        'RawDataUniqueID' => '50781',
                        'AliasLayerMetadata' => '50784',
                        'OriginalRawFileName' => '50827',
                        'OriginalRawFileData' => '50828',
                        'ActiveArea' => '50829',
                        'MaskedAreas' => '50830',
                        'AsShotICCProfile' => '50831',
                        'AsShotPreProfileMatrix' => '50832',
                        'CurrentICCProfile' => '50833',
                        'CurrentPreProfileMatrix' => '50834',
                        'ColorimetricReference' => '50879',
                        'PanasonicTitle' => '50898',
                        'PanasonicTitle2' => '50899',
                        'CameraCalibrationSig' => '50931',
                        'ProfileCalibrationSig' => '50932',
                        'ProfileIFD' => '50933',
                        'AsShotProfileName' => '50934',
                        'NoiseReductionApplied' => '50935',
                        'ProfileName' => '50936',
                        'ProfileHueSatMapDims' => '50937',
                        'ProfileHueSatMapData1' => '50938',
                        'ProfileHueSatMapData2' => '50939',
                        'ProfileToneCurve' => '50940',
                        'ProfileEmbedPolicy' => '50941',
                        'ProfileCopyright' => '50942',
                        'ForwardMatrix1' => '50964',
                        'ForwardMatrix2' => '50965',
                        'PreviewApplicationName' => '50966',
                        'PreviewApplicationVersion' => '50967',
                        'PreviewSettingsName' => '50968',
                        'PreviewSettingsDigest' => '50969',
                        'PreviewColorSpace' => '50970',
                        'PreviewDateTime' => '50971',
                        'RawImageDigest' => '50972',
                        'OriginalRawFileDigest' => '50973',
                        'SubTileBlockSize' => '50974',
                        'RowInterleaveFactor' => '50975',
                        'ProfileLookTableDims' => '50981',
                        'ProfileLookTableData' => '50982',
                        'OpcodeList1' => '51008',
                        'OpcodeList2' => '51009',
                        'OpcodeList3' => '51022',
                        'NoiseProfile' => '51041',
                        'Padding' => '59932',
                        'OffsetSchema' => '59933',
                        'OwnerName' => '65000',
                        'SerialNumber' => '65001',
                        'Lens' => '65002',
                        'KDC_IFD' => '65024',
                        'RawFile' => '65100',
                        'Converter' => '65101',
                        'WhiteBalance' => '65102',
                        'Exposure' => '65105',
                        'Shadows' => '65106',
                        'Brightness' => '65107',
                        'Contrast' => '65108',
                        'Saturation' => '65109',
                        'Sharpness' => '65110',
                        'Smoothness' => '65111',
                        'MoireFilter' => '65112',
        );

        public function extraireMetadonnees($cheminImage) {
                if ($this->peutUtiliserExifTool()) {
                        $this->meta = $this->decoderMetadonneesExifTool($cheminImage);
                } else {
                        $this->meta = $this->decoderMetadonneesBasique($cheminImage);
                }

                $metadonnees = array();
                $metadonnees['hauteur'] = $this->obtenirHauteur();
                $metadonnees['largeur'] = $this->obtenirLargeur();
                $metadonnees['date_prise_de_vue'] = $this->obtenirDatePriseDeVue();
                $metadonnees['appareil_fabriquant'] = $this->obtenirAppareilFabricant();
                $metadonnees['appareil_modele'] = $this->obtenirAppareilModele();
                $metadonnees['meta_exif'] = $this->convertirMetaVersXML('EXIF');
                $metadonnees['meta_iptc'] = $this->convertirMetaVersXML('IPTC');
                $metadonnees['meta_xmp'] = $this->convertirMetaVersXML('XMP');
                $metadonnees['meta_makernote'] = $this->convertirMetaVersXML('MAKERNOTE');
                return $metadonnees;
        }

        private function peutUtiliserExifTool() {
                // TODO indiquer ceci dans un fichier de config
                return file_exists('/usr/bin/exiftool') && is_executable('/usr/bin/exiftool');
        }

        private function decoderMetadonneesExifTool($cheminImage) {
                $metadata = array();
                $res = exec('/usr/bin/exiftool -g -D '.$cheminImage, $metadata);

                $metadata_decodees = array();
                $categorie = '';
                foreach($metadata as &$data) {
                        if ($this->estUnSeparateurCategorieExifTool($data)) {
                                $categorie = trim(str_replace('----', '', $data));
                        } else {
                                $data_decodee = $this->parserValeurMetadonneeExifTool($data);
                                $cle_metadonnee = str_replace(' ', '', $data_decodee['cle']);
                                $metadata_decodees[$categorie][$cle_metadonnee] = $data_decodee;
                        }
                }
                return $metadata_decodees;
        }

        private function estUnSeparateurCategorieExifTool($data) {
                return preg_match('^---- (.)* ----^',$data);
        }

        private function parserValeurMetadonneeExifTool($data) {
                $cle_valeur = explode(':',$data,2);

                $valeur = '';
                if(count($cle_valeur) == 2) {
                        $valeur = trim($cle_valeur[1]);
                }

                $id_cle = explode(' ',trim($cle_valeur[0]),2);

                $id_cle[1] = str_replace(array('-','/'),'',$id_cle[1]);

                $cle_id_valeur = array('cle' => $id_cle[1], 'id' => str_replace('-','',$id_cle[0]), 'valeur' => $valeur);
                return $cle_id_valeur;
        }

        public function decoderMetadonneesBasique($chemin_fichier) {
        $exif = @exif_read_data($chemin_fichier, "EXIF,COMPUTED,IFD0,FILE,COMMENT", true, false);

        // tant pis pour les makernote et xmp, les décoder demande trop de librairies externes, autant installer exiftool alors
        $metadonnees = array();
                $metadonnees['XMP'] = array();
                unset($metadonnees['EXIF']['MakerNote']);
                $metadonnees['MAKERNOTE'] = array();
                $metadonnees_non_formatees = array();
                if(isset($exif['EXIF'])) {
                        $metadonnees_non_formatees = array_merge($metadonnees_non_formatees, $exif['EXIF']);
                }
                if(isset($exif['IFD0'])) {
                        $metadonnees_non_formatees = array_merge($metadonnees_non_formatees, $exif['IFD0']);
                }
                $metadonnees['EXIF'] = $this->formaterTableauExif($metadonnees_non_formatees);
        $metadonnees['IPTC'] = $this->extraireIptc($chemin_fichier);
        $metadonnees['File'] = array(
                'ImageWidth' => array('id' => '', 'valeur' => $exif['COMPUTED']['Width']),
                        'ImageHeight' => array('id' => '', 'valeur' => $exif['COMPUTED']['Height']));
        return $metadonnees ;
    }

    private function formaterTableauExif(&$tableau) {
        $tableau_exif_formate = array();

        foreach ($tableau as $nom_tag => $valeur) {
                $id = '';
                if (isset($this->tableau_ids_tags_exif[$nom_tag])) {
                        $id = $this->tableau_ids_tags_exif[$nom_tag];
                }
                $tableau_exif_formate[$nom_tag] = array('id' => $id, 'valeur' => $valeur);
        }

        return $tableau_exif_formate;
    }

    /**
    * Extraction des metadonnées iptc
    **/
    public function extraireIptc($chemin_fichier) {
        $meta = array();

        // getimagesize renvoie les infos iptc dans le tableau info
        $info = array();
        $size = getimagesize($chemin_fichier, $info);

        // s'il existe
        if (isset($info["APP13"])) {
            // on parse les donnees
            $iptc = iptcparse($info["APP13"]);
            if ($iptc) {
                // et on les analyse
                foreach ($iptc as $marker => $section) {
                    foreach ($section as $nom => $val) {
                        // pour remplir le tableau de donnees
                        $this->decoderValeurIptc($marker, $val, $meta);
                    }
                }
            }
        }

        return $meta;
    }

    /**
    * Stocke une valeur de metadonnées iptc dans le champ du tableau correspondant
    * @param String $nom nom de la valeur
    * @param String $val valeur
    * @param String $data référence vers le tableau où la donnée sera stockée
    **/
    private function decoderValeurIptc($nom, $val, &$data_tab) {
        switch ($nom) {
            case "2#005" :// mots cles iptc
                $data_tab['Category'] = array('id' => '5', 'valeur' => $val);
                break;
            case "2#080" :// champ by line
                $data_tab['By-Line']  = array('id' => '80', 'valeur' => $val);
                break ;
            case "2#085" :// champ by line titre
                $data_tab['By-LineTitle'] = array('id' => '85', 'valeur' => $val);
                break ;
            case "2#090" :// ville
                $data_tab['City'] = array('id' => '90', 'valeur' => $val);
                break ;
            case "2#092" :// sous location
                $data_tab['SubLocation'] = array('id' => '92', 'valeur' => $val);
                break ;
            case "2#095" :// etat (pour les us)
                $data_tab['ProvinceState'] = array('id' => '95', 'valeur' => $val);
                break ;
            case "2#100" :// code pays
                $data_tab['CountryPrimaryLocationCode'] = array('id' => '100', 'valeur' => $val);
                break ;
            case "2#101" :// code pays
                $data_tab['CountryName'] = array('id' => '101', 'valeur' => $val);
                break ;
            case "2#105" :// titre principal
                $data_tab['Headline'] = array('id' => '105', 'valeur' => $val);
                break ;
            case "2#110" :// credit
                $data_tab['Credit'] = array('id' => '110', 'valeur' => $val);
                break ;
            case "2#116" :// copyright
                $data_tab['CopyrightNotice'] = array('id' => '116', 'valeur' => $val);
                break ;
            case "2#118" :// contact
                $data_tab['Contact'] = array('id' => '118', 'valeur' => $val);
                break ;
            default:
                unset($data_tab['nom']);
        }
    }

    private function obtenirHauteur() {
        $hauteur = isset($this->meta['File']['ImageHeight']) ? $this->meta['File']['ImageHeight']['valeur'] : '';
        return $hauteur;
    }

    private function obtenirLargeur() {
        $largeur = isset($this->meta['File']['ImageWidth']) ? $this->meta['File']['ImageWidth']['valeur'] : '';
        return $largeur;
    }

    private function obtenirDatePriseDeVue() {
        $date = isset($this->meta['EXIF']['DateTimeOriginal']) ? $this->meta['EXIF']['DateTimeOriginal']['valeur'] : '';
        return $date;
    }

    private function obtenirAppareilFabricant() {
        $fabriquant = isset($this->meta['EXIF']['Make']) ? $this->meta['EXIF']['Make']['valeur'] : '';
        return $fabriquant;
    }

    private function obtenirAppareilModele() {
        $modele = isset($this->meta['EXIF']['CameraModelName']) ? $this->meta['EXIF']['CameraModelName']['valeur'] : '';
        return $modele;
    }

    private function convertirMetaVersXML($type) {
        $xml = null;
        if (isset($this->meta[$type])) {
                $racine = strtolower($type);

                $xml = '<?xml version="1.0" encoding="UTF-8" ?>'."\n";
                $xml .= "<$racine>"."\n";
                foreach ($this->meta[$type] as $prop => &$valeur) {
                        $xml .= '<'.$prop.' id="'.$valeur['id'].'">'.$valeur['valeur'].'</'.$prop.'>'."\n";
                }
                $xml .= "</$racine>";
        }
        return $xml;
    }
}
?>