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Diffstat (limited to 'includes/Exif.php')
| -rw-r--r-- | includes/Exif.php | 1124 |
1 files changed, 1124 insertions, 0 deletions
diff --git a/includes/Exif.php b/includes/Exif.php new file mode 100644 index 00000000..f9fb9a2c --- /dev/null +++ b/includes/Exif.php @@ -0,0 +1,1124 @@ +<?php +/** + * @package MediaWiki + * @subpackage Metadata + * + * @author Ævar Arnfjörð Bjarmason <avarab@gmail.com> + * @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason + * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * http://www.gnu.org/copyleft/gpl.html + * + * @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification + * @bug 1555, 1947 + */ + +/** + * @package MediaWiki + * @subpackage Metadata + */ +class Exif { + //@{ + /* @var array + * @private + */ + + /**#@+ + * Exif tag type definition + */ + const BYTE = 1; # An 8-bit (1-byte) unsigned integer. + const ASCII = 2; # An 8-bit byte containing one 7-bit ASCII code. The final byte is terminated with NULL. + const SHORT = 3; # A 16-bit (2-byte) unsigned integer. + const LONG = 4; # A 32-bit (4-byte) unsigned integer. + const RATIONAL = 5; # Two LONGs. The first LONG is the numerator and the second LONG expresses the denominator + const UNDEFINED = 7; # An 8-bit byte that can take any value depending on the field definition + const SLONG = 9; # A 32-bit (4-byte) signed integer (2's complement notation), + const SRATIONAL = 10; # Two SLONGs. The first SLONG is the numerator and the second SLONG is the denominator. + + /** + * Exif tags grouped by category, the tagname itself is the key and the type + * is the value, in the case of more than one possible value type they are + * seperated by commas. + */ + var $mExifTags; + + /** + * A one dimentional array of all Exif tags + */ + var $mFlatExifTags; + + /** + * The raw Exif data returned by exif_read_data() + */ + var $mRawExifData; + + /** + * A Filtered version of $mRawExifData that has been pruned of invalid + * tags and tags that contain content they shouldn't contain according + * to the Exif specification + */ + var $mFilteredExifData; + + /** + * Filtered and formatted Exif data, see FormatExif::getFormattedData() + */ + var $mFormattedExifData; + + //@} + + //@{ + /* @var string + * @private + */ + + /** + * The file being processed + */ + var $file; + + /** + * The basename of the file being processed + */ + var $basename; + + /** + * The private log to log to + */ + var $log = 'exif'; + + //@} + + /** + * Constructor + * + * @param $file String: filename. + */ + function Exif( $file ) { + /** + * Page numbers here refer to pages in the EXIF 2.2 standard + * + * @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification + */ + $this->mExifTags = array( + # TIFF Rev. 6.0 Attribute Information (p22) + 'tiff' => array( + # Tags relating to image structure + 'structure' => array( + 'ImageWidth' => Exif::SHORT.','.Exif::LONG, # Image width + 'ImageLength' => Exif::SHORT.','.Exif::LONG, # Image height + 'BitsPerSample' => Exif::SHORT, # Number of bits per component + # "When a primary image is JPEG compressed, this designation is not" + # "necessary and is omitted." (p23) + 'Compression' => Exif::SHORT, # Compression scheme #p23 + 'PhotometricInterpretation' => Exif::SHORT, # Pixel composition #p23 + 'Orientation' => Exif::SHORT, # Orientation of image #p24 + 'SamplesPerPixel' => Exif::SHORT, # Number of components + 'PlanarConfiguration' => Exif::SHORT, # Image data arrangement #p24 + 'YCbCrSubSampling' => Exif::SHORT, # Subsampling ratio of Y to C #p24 + 'YCbCrPositioning' => Exif::SHORT, # Y and C positioning #p24-25 + 'XResolution' => Exif::RATIONAL, # Image resolution in width direction + 'YResolution' => Exif::RATIONAL, # Image resolution in height direction + 'ResolutionUnit' => Exif::SHORT, # Unit of X and Y resolution #(p26) + ), + + # Tags relating to recording offset + 'offset' => array( + 'StripOffsets' => Exif::SHORT.','.Exif::LONG, # Image data location + 'RowsPerStrip' => Exif::SHORT.','.Exif::LONG, # Number of rows per strip + 'StripByteCounts' => Exif::SHORT.','.Exif::LONG, # Bytes per compressed strip + 'JPEGInterchangeFormat' => Exif::SHORT.','.Exif::LONG, # Offset to JPEG SOI + 'JPEGInterchangeFormatLength' => Exif::SHORT.','.Exif::LONG, # Bytes of JPEG data + ), + + # Tags relating to image data characteristics + 'characteristics' => array( + 'TransferFunction' => Exif::SHORT, # Transfer function + 'WhitePoint' => Exif::RATIONAL, # White point chromaticity + 'PrimaryChromaticities' => Exif::RATIONAL, # Chromaticities of primarities + 'YCbCrCoefficients' => Exif::RATIONAL, # Color space transformation matrix coefficients #p27 + 'ReferenceBlackWhite' => Exif::RATIONAL # Pair of black and white reference values + ), + + # Other tags + 'other' => array( + 'DateTime' => Exif::ASCII, # File change date and time + 'ImageDescription' => Exif::ASCII, # Image title + 'Make' => Exif::ASCII, # Image input equipment manufacturer + 'Model' => Exif::ASCII, # Image input equipment model + 'Software' => Exif::ASCII, # Software used + 'Artist' => Exif::ASCII, # Person who created the image + 'Copyright' => Exif::ASCII, # Copyright holder + ), + ), + + # Exif IFD Attribute Information (p30-31) + 'exif' => array( + # Tags relating to version + 'version' => array( + # TODO: NOTE: Nonexistence of this field is taken to mean nonconformance + # to the EXIF 2.1 AND 2.2 standards + 'ExifVersion' => Exif::UNDEFINED, # Exif version + 'FlashpixVersion' => Exif::UNDEFINED, # Supported Flashpix version #p32 + ), + + # Tags relating to Image Data Characteristics + 'characteristics' => array( + 'ColorSpace' => Exif::SHORT, # Color space information #p32 + ), + + # Tags relating to image configuration + 'configuration' => array( + 'ComponentsConfiguration' => Exif::UNDEFINED, # Meaning of each component #p33 + 'CompressedBitsPerPixel' => Exif::RATIONAL, # Image compression mode + 'PixelYDimension' => Exif::SHORT.','.Exif::LONG, # Valid image width + 'PixelXDimension' => Exif::SHORT.','.Exif::LONG, # Valind image height + ), + + # Tags relating to related user information + 'user' => array( + 'MakerNote' => Exif::UNDEFINED, # Manufacturer notes + 'UserComment' => Exif::UNDEFINED, # User comments #p34 + ), + + # Tags relating to related file information + 'related' => array( + 'RelatedSoundFile' => Exif::ASCII, # Related audio file + ), + + # Tags relating to date and time + 'dateandtime' => array( + 'DateTimeOriginal' => Exif::ASCII, # Date and time of original data generation #p36 + 'DateTimeDigitized' => Exif::ASCII, # Date and time of original data generation + 'SubSecTime' => Exif::ASCII, # DateTime subseconds + 'SubSecTimeOriginal' => Exif::ASCII, # DateTimeOriginal subseconds + 'SubSecTimeDigitized' => Exif::ASCII, # DateTimeDigitized subseconds + ), + + # Tags relating to picture-taking conditions (p31) + 'conditions' => array( + 'ExposureTime' => Exif::RATIONAL, # Exposure time + 'FNumber' => Exif::RATIONAL, # F Number + 'ExposureProgram' => Exif::SHORT, # Exposure Program #p38 + 'SpectralSensitivity' => Exif::ASCII, # Spectral sensitivity + 'ISOSpeedRatings' => Exif::SHORT, # ISO speed rating + 'OECF' => Exif::UNDEFINED, # Optoelectronic conversion factor + 'ShutterSpeedValue' => Exif::SRATIONAL, # Shutter speed + 'ApertureValue' => Exif::RATIONAL, # Aperture + 'BrightnessValue' => Exif::SRATIONAL, # Brightness + 'ExposureBiasValue' => Exif::SRATIONAL, # Exposure bias + 'MaxApertureValue' => Exif::RATIONAL, # Maximum land aperture + 'SubjectDistance' => Exif::RATIONAL, # Subject distance + 'MeteringMode' => Exif::SHORT, # Metering mode #p40 + 'LightSource' => Exif::SHORT, # Light source #p40-41 + 'Flash' => Exif::SHORT, # Flash #p41-42 + 'FocalLength' => Exif::RATIONAL, # Lens focal length + 'SubjectArea' => Exif::SHORT, # Subject area + 'FlashEnergy' => Exif::RATIONAL, # Flash energy + 'SpatialFrequencyResponse' => Exif::UNDEFINED, # Spatial frequency response + 'FocalPlaneXResolution' => Exif::RATIONAL, # Focal plane X resolution + 'FocalPlaneYResolution' => Exif::RATIONAL, # Focal plane Y resolution + 'FocalPlaneResolutionUnit' => Exif::SHORT, # Focal plane resolution unit #p46 + 'SubjectLocation' => Exif::SHORT, # Subject location + 'ExposureIndex' => Exif::RATIONAL, # Exposure index + 'SensingMethod' => Exif::SHORT, # Sensing method #p46 + 'FileSource' => Exif::UNDEFINED, # File source #p47 + 'SceneType' => Exif::UNDEFINED, # Scene type #p47 + 'CFAPattern' => Exif::UNDEFINED, # CFA pattern + 'CustomRendered' => Exif::SHORT, # Custom image processing #p48 + 'ExposureMode' => Exif::SHORT, # Exposure mode #p48 + 'WhiteBalance' => Exif::SHORT, # White Balance #p49 + 'DigitalZoomRatio' => Exif::RATIONAL, # Digital zoom ration + 'FocalLengthIn35mmFilm' => Exif::SHORT, # Focal length in 35 mm film + 'SceneCaptureType' => Exif::SHORT, # Scene capture type #p49 + 'GainControl' => Exif::RATIONAL, # Scene control #p49-50 + 'Contrast' => Exif::SHORT, # Contrast #p50 + 'Saturation' => Exif::SHORT, # Saturation #p50 + 'Sharpness' => Exif::SHORT, # Sharpness #p50 + 'DeviceSettingDescription' => Exif::UNDEFINED, # Desice settings description + 'SubjectDistanceRange' => Exif::SHORT, # Subject distance range #p51 + ), + + 'other' => array( + 'ImageUniqueID' => Exif::ASCII, # Unique image ID + ), + ), + + # GPS Attribute Information (p52) + 'gps' => array( + 'GPSVersionID' => Exif::BYTE, # GPS tag version + 'GPSLatitudeRef' => Exif::ASCII, # North or South Latitude #p52-53 + 'GPSLatitude' => Exif::RATIONAL, # Latitude + 'GPSLongitudeRef' => Exif::ASCII, # East or West Longitude #p53 + 'GPSLongitude' => Exif::RATIONAL, # Longitude + 'GPSAltitudeRef' => Exif::BYTE, # Altitude reference + 'GPSAltitude' => Exif::RATIONAL, # Altitude + 'GPSTimeStamp' => Exif::RATIONAL, # GPS time (atomic clock) + 'GPSSatellites' => Exif::ASCII, # Satellites used for measurement + 'GPSStatus' => Exif::ASCII, # Receiver status #p54 + 'GPSMeasureMode' => Exif::ASCII, # Measurement mode #p54-55 + 'GPSDOP' => Exif::RATIONAL, # Measurement precision + 'GPSSpeedRef' => Exif::ASCII, # Speed unit #p55 + 'GPSSpeed' => Exif::RATIONAL, # Speed of GPS receiver + 'GPSTrackRef' => Exif::ASCII, # Reference for direction of movement #p55 + 'GPSTrack' => Exif::RATIONAL, # Direction of movement + 'GPSImgDirectionRef' => Exif::ASCII, # Reference for direction of image #p56 + 'GPSImgDirection' => Exif::RATIONAL, # Direction of image + 'GPSMapDatum' => Exif::ASCII, # Geodetic survey data used + 'GPSDestLatitudeRef' => Exif::ASCII, # Reference for latitude of destination #p56 + 'GPSDestLatitude' => Exif::RATIONAL, # Latitude destination + 'GPSDestLongitudeRef' => Exif::ASCII, # Reference for longitude of destination #p57 + 'GPSDestLongitude' => Exif::RATIONAL, # Longitude of destination + 'GPSDestBearingRef' => Exif::ASCII, # Reference for bearing of destination #p57 + 'GPSDestBearing' => Exif::RATIONAL, # Bearing of destination + 'GPSDestDistanceRef' => Exif::ASCII, # Reference for distance to destination #p57-58 + 'GPSDestDistance' => Exif::RATIONAL, # Distance to destination + 'GPSProcessingMethod' => Exif::UNDEFINED, # Name of GPS processing method + 'GPSAreaInformation' => Exif::UNDEFINED, # Name of GPS area + 'GPSDateStamp' => Exif::ASCII, # GPS date + 'GPSDifferential' => Exif::SHORT, # GPS differential correction + ), + ); + + $this->file = $file; + $this->basename = basename( $this->file ); + + $this->makeFlatExifTags(); + + $this->debugFile( $this->basename, __FUNCTION__, true ); + wfSuppressWarnings(); + $data = exif_read_data( $this->file ); + wfRestoreWarnings(); + /** + * exif_read_data() will return false on invalid input, such as + * when somebody uploads a file called something.jpeg + * containing random gibberish. + */ + $this->mRawExifData = $data ? $data : array(); + + $this->makeFilteredData(); + $this->makeFormattedData(); + + $this->debugFile( __FUNCTION__, false ); + } + + /**#@+ + * @private + */ + /** + * Generate a flat list of the exif tags + */ + function makeFlatExifTags() { + $this->extractTags( $this->mExifTags ); + } + + /** + * A recursing extractor function used by makeFlatExifTags() + * + * Note: This used to use an array_walk function, but it made PHP5 + * segfault, see `cvs diff -u -r 1.4 -r 1.5 Exif.php` + */ + function extractTags( &$tagset ) { + foreach( $tagset as $key => $val ) { + if( is_array( $val ) ) { + $this->extractTags( $val ); + } else { + $this->mFlatExifTags[$key] = $val; + } + } + } + + /** + * Make $this->mFilteredExifData + */ + function makeFilteredData() { + $this->mFilteredExifData = $this->mRawExifData; + + foreach( $this->mFilteredExifData as $k => $v ) { + if ( !in_array( $k, array_keys( $this->mFlatExifTags ) ) ) { + $this->debug( $v, __FUNCTION__, "'$k' is not a valid Exif tag" ); + unset( $this->mFilteredExifData[$k] ); + } + } + + foreach( $this->mFilteredExifData as $k => $v ) { + if ( !$this->validate($k, $v) ) { + $this->debug( $v, __FUNCTION__, "'$k' contained invalid data" ); + unset( $this->mFilteredExifData[$k] ); + } + } + } + + /** + * @todo document + */ + function makeFormattedData( ) { + $format = new FormatExif( $this->getFilteredData() ); + $this->mFormattedExifData = $format->getFormattedData(); + } + /**#@-*/ + + /**#@+ + * @return array + */ + /** + * Get $this->mRawExifData + */ + function getData() { + return $this->mRawExifData; + } + + /** + * Get $this->mFilteredExifData + */ + function getFilteredData() { + return $this->mFilteredExifData; + } + + /** + * Get $this->mFormattedExifData + */ + function getFormattedData() { + return $this->mFormattedExifData; + } + /**#@-*/ + + /** + * The version of the output format + * + * Before the actual metadata information is saved in the database we + * strip some of it since we don't want to save things like thumbnails + * which usually accompany Exif data. This value gets saved in the + * database along with the actual Exif data, and if the version in the + * database doesn't equal the value returned by this function the Exif + * data is regenerated. + * + * @return int + */ + function version() { + return 1; // We don't need no bloddy constants! + } + + /**#@+ + * Validates if a tag value is of the type it should be according to the Exif spec + * + * @private + * + * @param $in Mixed: the input value to check + * @return bool + */ + function isByte( $in ) { + if ( !is_array( $in ) && sprintf('%d', $in) == $in && $in >= 0 && $in <= 255 ) { + $this->debug( $in, __FUNCTION__, true ); + return true; + } else { + $this->debug( $in, __FUNCTION__, false ); + return false; + } + } + + function isASCII( $in ) { + if ( is_array( $in ) ) { + return false; + } + + if ( preg_match( "/[^\x0a\x20-\x7e]/", $in ) ) { + $this->debug( $in, __FUNCTION__, 'found a character not in our whitelist' ); + return false; + } + + if ( preg_match( "/^\s*$/", $in ) ) { + $this->debug( $in, __FUNCTION__, 'input consisted solely of whitespace' ); + return false; + } + + return true; + } + + function isShort( $in ) { + if ( !is_array( $in ) && sprintf('%d', $in) == $in && $in >= 0 && $in <= 65536 ) { + $this->debug( $in, __FUNCTION__, true ); + return true; + } else { + $this->debug( $in, __FUNCTION__, false ); + return false; + } + } + + function isLong( $in ) { + if ( !is_array( $in ) && sprintf('%d', $in) == $in && $in >= 0 && $in <= 4294967296 ) { + $this->debug( $in, __FUNCTION__, true ); + return true; + } else { + $this->debug( $in, __FUNCTION__, false ); + return false; + } + } + + function isRational( $in ) { + if ( !is_array( $in ) && @preg_match( "/^(\d+)\/(\d+[1-9]|[1-9]\d*)$/", $in, $m ) ) { # Avoid division by zero + return $this->isLong( $m[1] ) && $this->isLong( $m[2] ); + } else { + $this->debug( $in, __FUNCTION__, 'fed a non-fraction value' ); + return false; + } + } + + function isUndefined( $in ) { + if ( !is_array( $in ) && preg_match( "/^\d{4}$/", $in ) ) { // Allow ExifVersion and FlashpixVersion + $this->debug( $in, __FUNCTION__, true ); + return true; + } else { + $this->debug( $in, __FUNCTION__, false ); + return false; + } + } + + function isSlong( $in ) { + if ( $this->isLong( abs( $in ) ) ) { + $this->debug( $in, __FUNCTION__, true ); + return true; + } else { + $this->debug( $in, __FUNCTION__, false ); + return false; + } + } + + function isSrational( $in ) { + if ( !is_array( $in ) && preg_match( "/^(\d+)\/(\d+[1-9]|[1-9]\d*)$/", $in, $m ) ) { # Avoid division by zero + return $this->isSlong( $m[0] ) && $this->isSlong( $m[1] ); + } else { + $this->debug( $in, __FUNCTION__, 'fed a non-fraction value' ); + return false; + } + } + /**#@-*/ + + /** + * Validates if a tag has a legal value according to the Exif spec + * + * @private + * + * @param $tag String: the tag to check. + * @param $val Mixed: the value of the tag. + * @return bool + */ + function validate( $tag, $val ) { + $debug = "tag is '$tag'"; + // Does not work if not typecast + switch( (string)$this->mFlatExifTags[$tag] ) { + case (string)Exif::BYTE: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isByte( $val ); + case (string)Exif::ASCII: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isASCII( $val ); + case (string)Exif::SHORT: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isShort( $val ); + case (string)Exif::LONG: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isLong( $val ); + case (string)Exif::RATIONAL: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isRational( $val ); + case (string)Exif::UNDEFINED: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isUndefined( $val ); + case (string)Exif::SLONG: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isSlong( $val ); + case (string)Exif::SRATIONAL: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isSrational( $val ); + case (string)Exif::SHORT.','.Exif::LONG: + $this->debug( $val, __FUNCTION__, $debug ); + return $this->isShort( $val ) || $this->isLong( $val ); + default: + $this->debug( $val, __FUNCTION__, "The tag '$tag' is unknown" ); + return false; + } + } + + /** + * Convenience function for debugging output + * + * @private + * + * @param $in Mixed: + * @param $fname String: + * @param $action Mixed: , default NULL. + */ + function debug( $in, $fname, $action = NULL ) { + $type = gettype( $in ); + $class = ucfirst( __CLASS__ ); + if ( $type === 'array' ) + $in = print_r( $in, true ); + + if ( $action === true ) + wfDebugLog( $this->log, "$class::$fname: accepted: '$in' (type: $type)\n"); + elseif ( $action === false ) + wfDebugLog( $this->log, "$class::$fname: rejected: '$in' (type: $type)\n"); + elseif ( $action === null ) + wfDebugLog( $this->log, "$class::$fname: input was: '$in' (type: $type)\n"); + else + wfDebugLog( $this->log, "$class::$fname: $action (type: $type; content: '$in')\n"); + } + + /** + * Convenience function for debugging output + * + * @private + * + * @param $fname String: the name of the function calling this function + * @param $io Boolean: Specify whether we're beginning or ending + */ + function debugFile( $fname, $io ) { + $class = ucfirst( __CLASS__ ); + if ( $io ) { + wfDebugLog( $this->log, "$class::$fname: begin processing: '{$this->basename}'\n" ); + } else { + wfDebugLog( $this->log, "$class::$fname: end processing: '{$this->basename}'\n" ); + } + } + +} + +/** + * @package MediaWiki + * @subpackage Metadata + */ +class FormatExif { + /** + * The Exif data to format + * + * @var array + * @private + */ + var $mExif; + + /** + * Constructor + * + * @param $exif Array: the Exif data to format ( as returned by + * Exif::getFilteredData() ) + */ + function FormatExif( $exif ) { + $this->mExif = $exif; + } + + /** + * Numbers given by Exif user agents are often magical, that is they + * should be replaced by a detailed explanation depending on their + * value which most of the time are plain integers. This function + * formats Exif values into human readable form. + * + * @return array + */ + function getFormattedData() { + global $wgLang; + + $tags =& $this->mExif; + + $resolutionunit = !isset( $tags['ResolutionUnit'] ) || $tags['ResolutionUnit'] == 2 ? 2 : 3; + unset( $tags['ResolutionUnit'] ); + + foreach( $tags as $tag => $val ) { + switch( $tag ) { + case 'Compression': + switch( $val ) { + case 1: case 6: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'PhotometricInterpretation': + switch( $val ) { + case 2: case 6: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'Orientation': + switch( $val ) { + case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'PlanarConfiguration': + switch( $val ) { + case 1: case 2: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + // TODO: YCbCrSubSampling + // TODO: YCbCrPositioning + + case 'XResolution': + case 'YResolution': + switch( $resolutionunit ) { + case 2: + $tags[$tag] = $this->msg( 'XYResolution', 'i', $this->formatNum( $val ) ); + break; + case 3: + $this->msg( 'XYResolution', 'c', $this->formatNum( $val ) ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + // TODO: YCbCrCoefficients #p27 (see annex E) + case 'ExifVersion': case 'FlashpixVersion': + $tags[$tag] = "$val"/100; + break; + + case 'ColorSpace': + switch( $val ) { + case 1: case 'FFFF.H': + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'ComponentsConfiguration': + switch( $val ) { + case 0: case 1: case 2: case 3: case 4: case 5: case 6: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'DateTime': + case 'DateTimeOriginal': + case 'DateTimeDigitized': + if( preg_match( "/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/", $val ) ) { + $tags[$tag] = $wgLang->timeanddate( wfTimestamp(TS_MW, $val) ); + } + break; + + case 'ExposureProgram': + switch( $val ) { + case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'SubjectDistance': + $tags[$tag] = $this->msg( $tag, '', $this->formatNum( $val ) ); + break; + + case 'MeteringMode': + switch( $val ) { + case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 255: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'LightSource': + switch( $val ) { + case 0: case 1: case 2: case 3: case 4: case 9: case 10: case 11: + case 12: case 13: case 14: case 15: case 17: case 18: case 19: case 20: + case 21: case 22: case 23: case 24: case 255: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + // TODO: Flash + case 'FocalPlaneResolutionUnit': + switch( $val ) { + case 2: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'SensingMethod': + switch( $val ) { + case 1: case 2: case 3: case 4: case 5: case 7: case 8: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'FileSource': + switch( $val ) { + case 3: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'SceneType': + switch( $val ) { + case 1: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'CustomRendered': + switch( $val ) { + case 0: case 1: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'ExposureMode': + switch( $val ) { + case 0: case 1: case 2: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'WhiteBalance': + switch( $val ) { + case 0: case 1: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'SceneCaptureType': + switch( $val ) { + case 0: case 1: case 2: case 3: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GainControl': + switch( $val ) { + case 0: case 1: case 2: case 3: case 4: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'Contrast': + switch( $val ) { + case 0: case 1: case 2: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'Saturation': + switch( $val ) { + case 0: case 1: case 2: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'Sharpness': + switch( $val ) { + case 0: case 1: case 2: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'SubjectDistanceRange': + switch( $val ) { + case 0: case 1: case 2: case 3: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSLatitudeRef': + case 'GPSDestLatitudeRef': + switch( $val ) { + case 'N': case 'S': + $tags[$tag] = $this->msg( 'GPSLatitude', $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSLongitudeRef': + case 'GPSDestLongitudeRef': + switch( $val ) { + case 'E': case 'W': + $tags[$tag] = $this->msg( 'GPSLongitude', $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSStatus': + switch( $val ) { + case 'A': case 'V': + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSMeasureMode': + switch( $val ) { + case 2: case 3: + $tags[$tag] = $this->msg( $tag, $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSSpeedRef': + case 'GPSDestDistanceRef': + switch( $val ) { + case 'K': case 'M': case 'N': + $tags[$tag] = $this->msg( 'GPSSpeed', $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSTrackRef': + case 'GPSImgDirectionRef': + case 'GPSDestBearingRef': + switch( $val ) { + case 'T': case 'M': + $tags[$tag] = $this->msg( 'GPSDirection', $val ); + break; + default: + $tags[$tag] = $val; + break; + } + break; + + case 'GPSDateStamp': + $tags[$tag] = $wgLang->date( substr( $val, 0, 4 ) . substr( $val, 5, 2 ) . substr( $val, 8, 2 ) . '000000' ); + break; + + // This is not in the Exif standard, just a special + // case for our purposes which enables wikis to wikify + // the make, model and software name to link to their articles. + case 'Make': + case 'Model': + case 'Software': + $tags[$tag] = $this->msg( $tag, '', $val ); + break; + + case 'ExposureTime': + // Show the pretty fraction as well as decimal version + $tags[$tag] = wfMsg( 'exif-exposuretime-format', + $this->formatFraction( $val ), $this->formatNum( $val ) ); + break; + + case 'FNumber': + $tags[$tag] = wfMsg( 'exif-fnumber-format', + $this->formatNum( $val ) ); + break; + + case 'FocalLength': + $tags[$tag] = wfMsg( 'exif-focallength-format', + $this->formatNum( $val ) ); + break; + + default: + $tags[$tag] = $this->formatNum( $val ); + break; + } + } + + return $tags; + } + + /** + * Convenience function for getFormattedData() + * + * @private + * + * @param $tag String: the tag name to pass on + * @param $val String: the value of the tag + * @param $arg String: an argument to pass ($1) + * @return string A wfMsg of "exif-$tag-$val" in lower case + */ + function msg( $tag, $val, $arg = null ) { + global $wgContLang; + + if ($val === '') + $val = 'value'; + return wfMsg( $wgContLang->lc( "exif-$tag-$val" ), $arg ); + } + + /** + * Format a number, convert numbers from fractions into floating point + * numbers + * + * @private + * + * @param $num Mixed: the value to format + * @return mixed A floating point number or whatever we were fed + */ + function formatNum( $num ) { + if ( preg_match( '/^(\d+)\/(\d+)$/', $num, $m ) ) + return $m[2] != 0 ? $m[1] / $m[2] : $num; + else + return $num; + } + + /** + * Format a rational number, reducing fractions + * + * @private + * + * @param $num Mixed: the value to format + * @return mixed A floating point number or whatever we were fed + */ + function formatFraction( $num ) { + if ( preg_match( '/^(\d+)\/(\d+)$/', $num, $m ) ) { + $numerator = intval( $m[1] ); + $denominator = intval( $m[2] ); + $gcd = $this->gcd( $numerator, $denominator ); + if( $gcd != 0 ) { + // 0 shouldn't happen! ;) + return $numerator / $gcd . '/' . $denominator / $gcd; + } + } + return $this->formatNum( $num ); + } + + /** + * Calculate the greatest common divisor of two integers. + * + * @param $a Integer: FIXME + * @param $b Integer: FIXME + * @return int + * @private + */ + function gcd( $a, $b ) { + /* + // http://en.wikipedia.org/wiki/Euclidean_algorithm + // Recursive form would be: + if( $b == 0 ) + return $a; + else + return gcd( $b, $a % $b ); + */ + while( $b != 0 ) { + $remainder = $a % $b; + + // tail recursion... + $a = $b; + $b = $remainder; + } + return $a; + } +} + +/** + * MW 1.6 compatibility + */ +define( 'MW_EXIF_BYTE', Exif::BYTE ); +define( 'MW_EXIF_ASCII', Exif::ASCII ); +define( 'MW_EXIF_SHORT', Exif::SHORT ); +define( 'MW_EXIF_LONG', Exif::LONG ); +define( 'MW_EXIF_RATIONAL', Exif::RATIONAL ); +define( 'MW_EXIF_UNDEFINED', Exif::UNDEFINED ); +define( 'MW_EXIF_SLONG', Exif::SLONG ); +define( 'MW_EXIF_SRATIONAL', Exif::SRATIONAL ); + +?> |