--- /dev/null
+<?php
+/**
+ * Extraction and validation of image metadata.
+ *
+ * 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
+ *
+ * @ingroup Media
+ * @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
+ * @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason, 2009 Brent Garber
+ * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License
+ * @see http://exif.org/Exif2-2.PDF The Exif 2.2 specification
+ * @file
+ */
+
+/**
+ * Class to extract and validate Exif data from jpeg (and possibly tiff) files.
+ * @ingroup Media
+ */
+class Exif {
+ /** An 8-bit (1-byte) unsigned integer. */
+ const BYTE = 1;
+
+ /** An 8-bit byte containing one 7-bit ASCII code.
+ * The final byte is terminated with NULL.
+ */
+ const ASCII = 2;
+
+ /** A 16-bit (2-byte) unsigned integer. */
+ const SHORT = 3;
+
+ /** A 32-bit (4-byte) unsigned integer. */
+ const LONG = 4;
+
+ /** Two LONGs. The first LONG is the numerator and the second LONG expresses
+ * the denominator
+ */
+ const RATIONAL = 5;
+
+ /** A 16-bit (2-byte) or 32-bit (4-byte) unsigned integer. */
+ const SHORT_OR_LONG = 6;
+
+ /** An 8-bit byte that can take any value depending on the field definition */
+ const UNDEFINED = 7;
+
+ /** A 32-bit (4-byte) signed integer (2's complement notation), */
+ const SLONG = 9;
+
+ /** Two SLONGs. The first SLONG is the numerator and the second SLONG is
+ * the denominator.
+ */
+ const SRATIONAL = 10;
+
+ /** A fake value for things we don't want or don't support. */
+ const IGNORE = -1;
+
+ /** @var array 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 separated by commas.
+ */
+ private $mExifTags;
+
+ /** @var array The raw Exif data returned by exif_read_data() */
+ private $mRawExifData;
+
+ /** @var array 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
+ */
+ private $mFilteredExifData;
+
+ /** @var string The file being processed */
+ private $file;
+
+ /** @var string The basename of the file being processed */
+ private $basename;
+
+ /** @var string The private log to log to, e.g. 'exif' */
+ private $log = false;
+
+ /** @var string The byte order of the file. Needed because php's extension
+ * doesn't fully process some obscure props.
+ */
+ private $byteOrder;
+
+ /**
+ * @param string $file Filename.
+ * @param string $byteOrder Type of byte ordering either 'BE' (Big Endian)
+ * or 'LE' (Little Endian). Default ''.
+ * @throws MWException
+ * @todo FIXME: The following are broke:
+ * SubjectArea. Need to test the more obscure tags.
+ * DigitalZoomRatio = 0/0 is rejected. need to determine if that's valid.
+ * Possibly should treat 0/0 = 0. need to read exif spec on that.
+ */
+ function __construct( $file, $byteOrder = '' ) {
+ /**
+ * Page numbers here refer to pages in the Exif 2.2 standard
+ *
+ * Note, Exif::UNDEFINED is treated as a string, not as an array of bytes
+ * so don't put a count parameter for any UNDEFINED values.
+ *
+ * @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification
+ */
+ $this->mExifTags = [
+ # TIFF Rev. 6.0 Attribute Information (p22)
+ 'IFD0' => [
+ # Tags relating to image structure
+ 'ImageWidth' => self::SHORT_OR_LONG, # Image width
+ 'ImageLength' => self::SHORT_OR_LONG, # Image height
+ 'BitsPerSample' => [ self::SHORT, 3 ], # Number of bits per component
+ # "When a primary image is JPEG compressed, this designation is not"
+ # "necessary and is omitted." (p23)
+ 'Compression' => self::SHORT, # Compression scheme #p23
+ 'PhotometricInterpretation' => self::SHORT, # Pixel composition #p23
+ 'Orientation' => self::SHORT, # Orientation of image #p24
+ 'SamplesPerPixel' => self::SHORT, # Number of components
+ 'PlanarConfiguration' => self::SHORT, # Image data arrangement #p24
+ 'YCbCrSubSampling' => [ self::SHORT, 2 ], # Subsampling ratio of Y to C #p24
+ 'YCbCrPositioning' => self::SHORT, # Y and C positioning #p24-25
+ 'XResolution' => self::RATIONAL, # Image resolution in width direction
+ 'YResolution' => self::RATIONAL, # Image resolution in height direction
+ 'ResolutionUnit' => self::SHORT, # Unit of X and Y resolution #(p26)
+
+ # Tags relating to recording offset
+ 'StripOffsets' => self::SHORT_OR_LONG, # Image data location
+ 'RowsPerStrip' => self::SHORT_OR_LONG, # Number of rows per strip
+ 'StripByteCounts' => self::SHORT_OR_LONG, # Bytes per compressed strip
+ 'JPEGInterchangeFormat' => self::SHORT_OR_LONG, # Offset to JPEG SOI
+ 'JPEGInterchangeFormatLength' => self::SHORT_OR_LONG, # Bytes of JPEG data
+
+ # Tags relating to image data characteristics
+ 'TransferFunction' => self::IGNORE, # Transfer function
+ 'WhitePoint' => [ self::RATIONAL, 2 ], # White point chromaticity
+ 'PrimaryChromaticities' => [ self::RATIONAL, 6 ], # Chromaticities of primarities
+ # Color space transformation matrix coefficients #p27
+ 'YCbCrCoefficients' => [ self::RATIONAL, 3 ],
+ 'ReferenceBlackWhite' => [ self::RATIONAL, 6 ], # Pair of black and white reference values
+
+ # Other tags
+ 'DateTime' => self::ASCII, # File change date and time
+ 'ImageDescription' => self::ASCII, # Image title
+ 'Make' => self::ASCII, # Image input equipment manufacturer
+ 'Model' => self::ASCII, # Image input equipment model
+ 'Software' => self::ASCII, # Software used
+ 'Artist' => self::ASCII, # Person who created the image
+ 'Copyright' => self::ASCII, # Copyright holder
+ ],
+
+ # Exif IFD Attribute Information (p30-31)
+ 'EXIF' => [
+ # @todo NOTE: Nonexistence of this field is taken to mean nonconformance
+ # to the Exif 2.1 AND 2.2 standards
+ 'ExifVersion' => self::UNDEFINED, # Exif version
+ 'FlashPixVersion' => self::UNDEFINED, # Supported Flashpix version #p32
+
+ # Tags relating to Image Data Characteristics
+ 'ColorSpace' => self::SHORT, # Color space information #p32
+
+ # Tags relating to image configuration
+ 'ComponentsConfiguration' => self::UNDEFINED, # Meaning of each component #p33
+ 'CompressedBitsPerPixel' => self::RATIONAL, # Image compression mode
+ 'PixelYDimension' => self::SHORT_OR_LONG, # Valid image height
+ 'PixelXDimension' => self::SHORT_OR_LONG, # Valid image width
+
+ # Tags relating to related user information
+ 'MakerNote' => self::IGNORE, # Manufacturer notes
+ 'UserComment' => self::UNDEFINED, # User comments #p34
+
+ # Tags relating to related file information
+ 'RelatedSoundFile' => self::ASCII, # Related audio file
+
+ # Tags relating to date and time
+ 'DateTimeOriginal' => self::ASCII, # Date and time of original data generation #p36
+ 'DateTimeDigitized' => self::ASCII, # Date and time of original data generation
+ 'SubSecTime' => self::ASCII, # DateTime subseconds
+ 'SubSecTimeOriginal' => self::ASCII, # DateTimeOriginal subseconds
+ 'SubSecTimeDigitized' => self::ASCII, # DateTimeDigitized subseconds
+
+ # Tags relating to picture-taking conditions (p31)
+ 'ExposureTime' => self::RATIONAL, # Exposure time
+ 'FNumber' => self::RATIONAL, # F Number
+ 'ExposureProgram' => self::SHORT, # Exposure Program #p38
+ 'SpectralSensitivity' => self::ASCII, # Spectral sensitivity
+ 'ISOSpeedRatings' => self::SHORT, # ISO speed rating
+ 'OECF' => self::IGNORE,
+ # Optoelectronic conversion factor. Note: We don't have support for this atm.
+ 'ShutterSpeedValue' => self::SRATIONAL, # Shutter speed
+ 'ApertureValue' => self::RATIONAL, # Aperture
+ 'BrightnessValue' => self::SRATIONAL, # Brightness
+ 'ExposureBiasValue' => self::SRATIONAL, # Exposure bias
+ 'MaxApertureValue' => self::RATIONAL, # Maximum land aperture
+ 'SubjectDistance' => self::RATIONAL, # Subject distance
+ 'MeteringMode' => self::SHORT, # Metering mode #p40
+ 'LightSource' => self::SHORT, # Light source #p40-41
+ 'Flash' => self::SHORT, # Flash #p41-42
+ 'FocalLength' => self::RATIONAL, # Lens focal length
+ 'SubjectArea' => [ self::SHORT, 4 ], # Subject area
+ 'FlashEnergy' => self::RATIONAL, # Flash energy
+ 'SpatialFrequencyResponse' => self::IGNORE, # Spatial frequency response. Not supported atm.
+ 'FocalPlaneXResolution' => self::RATIONAL, # Focal plane X resolution
+ 'FocalPlaneYResolution' => self::RATIONAL, # Focal plane Y resolution
+ 'FocalPlaneResolutionUnit' => self::SHORT, # Focal plane resolution unit #p46
+ 'SubjectLocation' => [ self::SHORT, 2 ], # Subject location
+ 'ExposureIndex' => self::RATIONAL, # Exposure index
+ 'SensingMethod' => self::SHORT, # Sensing method #p46
+ 'FileSource' => self::UNDEFINED, # File source #p47
+ 'SceneType' => self::UNDEFINED, # Scene type #p47
+ 'CFAPattern' => self::IGNORE, # CFA pattern. not supported atm.
+ 'CustomRendered' => self::SHORT, # Custom image processing #p48
+ 'ExposureMode' => self::SHORT, # Exposure mode #p48
+ 'WhiteBalance' => self::SHORT, # White Balance #p49
+ 'DigitalZoomRatio' => self::RATIONAL, # Digital zoom ration
+ 'FocalLengthIn35mmFilm' => self::SHORT, # Focal length in 35 mm film
+ 'SceneCaptureType' => self::SHORT, # Scene capture type #p49
+ 'GainControl' => self::SHORT, # Scene control #p49-50
+ 'Contrast' => self::SHORT, # Contrast #p50
+ 'Saturation' => self::SHORT, # Saturation #p50
+ 'Sharpness' => self::SHORT, # Sharpness #p50
+ 'DeviceSettingDescription' => self::IGNORE,
+ # Device settings description. This could maybe be supported. Need to find an
+ # example file that uses this to see if it has stuff of interest in it.
+ 'SubjectDistanceRange' => self::SHORT, # Subject distance range #p51
+
+ 'ImageUniqueID' => self::ASCII, # Unique image ID
+ ],
+
+ # GPS Attribute Information (p52)
+ 'GPS' => [
+ 'GPSVersion' => self::UNDEFINED,
+ # Should be an array of 4 Exif::BYTE's. However php treats it as an undefined
+ # Note exif standard calls this GPSVersionID, but php doesn't like the id suffix
+ 'GPSLatitudeRef' => self::ASCII, # North or South Latitude #p52-53
+ 'GPSLatitude' => [ self::RATIONAL, 3 ], # Latitude
+ 'GPSLongitudeRef' => self::ASCII, # East or West Longitude #p53
+ 'GPSLongitude' => [ self::RATIONAL, 3 ], # Longitude
+ 'GPSAltitudeRef' => self::UNDEFINED,
+ # Altitude reference. Note, the exif standard says this should be an EXIF::Byte,
+ # but php seems to disagree.
+ 'GPSAltitude' => self::RATIONAL, # Altitude
+ 'GPSTimeStamp' => [ self::RATIONAL, 3 ], # GPS time (atomic clock)
+ 'GPSSatellites' => self::ASCII, # Satellites used for measurement
+ 'GPSStatus' => self::ASCII, # Receiver status #p54
+ 'GPSMeasureMode' => self::ASCII, # Measurement mode #p54-55
+ 'GPSDOP' => self::RATIONAL, # Measurement precision
+ 'GPSSpeedRef' => self::ASCII, # Speed unit #p55
+ 'GPSSpeed' => self::RATIONAL, # Speed of GPS receiver
+ 'GPSTrackRef' => self::ASCII, # Reference for direction of movement #p55
+ 'GPSTrack' => self::RATIONAL, # Direction of movement
+ 'GPSImgDirectionRef' => self::ASCII, # Reference for direction of image #p56
+ 'GPSImgDirection' => self::RATIONAL, # Direction of image
+ 'GPSMapDatum' => self::ASCII, # Geodetic survey data used
+ 'GPSDestLatitudeRef' => self::ASCII, # Reference for latitude of destination #p56
+ 'GPSDestLatitude' => [ self::RATIONAL, 3 ], # Latitude destination
+ 'GPSDestLongitudeRef' => self::ASCII, # Reference for longitude of destination #p57
+ 'GPSDestLongitude' => [ self::RATIONAL, 3 ], # Longitude of destination
+ 'GPSDestBearingRef' => self::ASCII, # Reference for bearing of destination #p57
+ 'GPSDestBearing' => self::RATIONAL, # Bearing of destination
+ 'GPSDestDistanceRef' => self::ASCII, # Reference for distance to destination #p57-58
+ 'GPSDestDistance' => self::RATIONAL, # Distance to destination
+ 'GPSProcessingMethod' => self::UNDEFINED, # Name of GPS processing method
+ 'GPSAreaInformation' => self::UNDEFINED, # Name of GPS area
+ 'GPSDateStamp' => self::ASCII, # GPS date
+ 'GPSDifferential' => self::SHORT, # GPS differential correction
+ ],
+ ];
+
+ $this->file = $file;
+ $this->basename = wfBaseName( $this->file );
+ if ( $byteOrder === 'BE' || $byteOrder === 'LE' ) {
+ $this->byteOrder = $byteOrder;
+ } else {
+ // Only give a warning for b/c, since originally we didn't
+ // require this. The number of things affected by this is
+ // rather small.
+ wfWarn( 'Exif class did not have byte order specified. ' .
+ 'Some properties may be decoded incorrectly.' );
+ $this->byteOrder = 'BE'; // BE seems about twice as popular as LE in jpg's.
+ }
+
+ $this->debugFile( $this->basename, __FUNCTION__, true );
+ if ( function_exists( 'exif_read_data' ) ) {
+ MediaWiki\suppressWarnings();
+ $data = exif_read_data( $this->file, 0, true );
+ MediaWiki\restoreWarnings();
+ } else {
+ throw new MWException( "Internal error: exif_read_data not present. " .
+ "\$wgShowEXIF may be incorrectly set or not checked by an extension." );
+ }
+ /**
+ * 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 ?: [];
+ $this->makeFilteredData();
+ $this->collapseData();
+ $this->debugFile( __FUNCTION__, false );
+ }
+
+ /**
+ * Make $this->mFilteredExifData
+ */
+ function makeFilteredData() {
+ $this->mFilteredExifData = [];
+
+ foreach ( array_keys( $this->mRawExifData ) as $section ) {
+ if ( !array_key_exists( $section, $this->mExifTags ) ) {
+ $this->debug( $section, __FUNCTION__, "'$section' is not a valid Exif section" );
+ continue;
+ }
+
+ foreach ( array_keys( $this->mRawExifData[$section] ) as $tag ) {
+ if ( !array_key_exists( $tag, $this->mExifTags[$section] ) ) {
+ $this->debug( $tag, __FUNCTION__, "'$tag' is not a valid tag in '$section'" );
+ continue;
+ }
+
+ $this->mFilteredExifData[$tag] = $this->mRawExifData[$section][$tag];
+ // This is ok, as the tags in the different sections do not conflict.
+ // except in computed and thumbnail section, which we don't use.
+
+ $value = $this->mRawExifData[$section][$tag];
+ if ( !$this->validate( $section, $tag, $value ) ) {
+ $this->debug( $value, __FUNCTION__, "'$tag' contained invalid data" );
+ unset( $this->mFilteredExifData[$tag] );
+ }
+ }
+ }
+ }
+
+ /**
+ * Collapse some fields together.
+ * This converts some fields from exif form, to a more friendly form.
+ * For example GPS latitude to a single number.
+ *
+ * The rationale behind this is that we're storing data, not presenting to the user
+ * For example a longitude is a single number describing how far away you are from
+ * the prime meridian. Well it might be nice to split it up into minutes and seconds
+ * for the user, it doesn't really make sense to split a single number into 4 parts
+ * for storage. (degrees, minutes, second, direction vs single floating point number).
+ *
+ * Other things this might do (not really sure if they make sense or not):
+ * Dates -> mediawiki date format.
+ * convert values that can be in different units to be in one standardized unit.
+ *
+ * As an alternative approach, some of this could be done in the validate phase
+ * if we make up our own types like Exif::DATE.
+ */
+ function collapseData() {
+ $this->exifGPStoNumber( 'GPSLatitude' );
+ $this->exifGPStoNumber( 'GPSDestLatitude' );
+ $this->exifGPStoNumber( 'GPSLongitude' );
+ $this->exifGPStoNumber( 'GPSDestLongitude' );
+
+ if ( isset( $this->mFilteredExifData['GPSAltitude'] )
+ && isset( $this->mFilteredExifData['GPSAltitudeRef'] )
+ ) {
+ // We know altitude data is a <num>/<denom> from the validation
+ // functions ran earlier. But multiplying such a string by -1
+ // doesn't work well, so convert.
+ list( $num, $denom ) = explode( '/', $this->mFilteredExifData['GPSAltitude'] );
+ $this->mFilteredExifData['GPSAltitude'] = $num / $denom;
+
+ if ( $this->mFilteredExifData['GPSAltitudeRef'] === "\1" ) {
+ $this->mFilteredExifData['GPSAltitude'] *= -1;
+ }
+ unset( $this->mFilteredExifData['GPSAltitudeRef'] );
+ }
+
+ $this->exifPropToOrd( 'FileSource' );
+ $this->exifPropToOrd( 'SceneType' );
+
+ $this->charCodeString( 'UserComment' );
+ $this->charCodeString( 'GPSProcessingMethod' );
+ $this->charCodeString( 'GPSAreaInformation' );
+
+ // ComponentsConfiguration should really be an array instead of a string...
+ // This turns a string of binary numbers into an array of numbers.
+
+ if ( isset( $this->mFilteredExifData['ComponentsConfiguration'] ) ) {
+ $val = $this->mFilteredExifData['ComponentsConfiguration'];
+ $ccVals = [];
+
+ $strLen = strlen( $val );
+ for ( $i = 0; $i < $strLen; $i++ ) {
+ $ccVals[$i] = ord( substr( $val, $i, 1 ) );
+ }
+ $ccVals['_type'] = 'ol'; // this is for formatting later.
+ $this->mFilteredExifData['ComponentsConfiguration'] = $ccVals;
+ }
+
+ // GPSVersion(ID) is treated as the wrong type by php exif support.
+ // Go through each byte turning it into a version string.
+ // For example: "\x02\x02\x00\x00" -> "2.2.0.0"
+
+ // Also change exif tag name from GPSVersion (what php exif thinks it is)
+ // to GPSVersionID (what the exif standard thinks it is).
+
+ if ( isset( $this->mFilteredExifData['GPSVersion'] ) ) {
+ $val = $this->mFilteredExifData['GPSVersion'];
+ $newVal = '';
+
+ $strLen = strlen( $val );
+ for ( $i = 0; $i < $strLen; $i++ ) {
+ if ( $i !== 0 ) {
+ $newVal .= '.';
+ }
+ $newVal .= ord( substr( $val, $i, 1 ) );
+ }
+
+ if ( $this->byteOrder === 'LE' ) {
+ // Need to reverse the string
+ $newVal2 = '';
+ for ( $i = strlen( $newVal ) - 1; $i >= 0; $i-- ) {
+ $newVal2 .= substr( $newVal, $i, 1 );
+ }
+ $this->mFilteredExifData['GPSVersionID'] = $newVal2;
+ } else {
+ $this->mFilteredExifData['GPSVersionID'] = $newVal;
+ }
+ unset( $this->mFilteredExifData['GPSVersion'] );
+ }
+ }
+
+ /**
+ * Do userComment tags and similar. See pg. 34 of exif standard.
+ * basically first 8 bytes is charset, rest is value.
+ * This has not been tested on any shift-JIS strings.
+ * @param string $prop Prop name
+ */
+ private function charCodeString( $prop ) {
+ if ( isset( $this->mFilteredExifData[$prop] ) ) {
+ if ( strlen( $this->mFilteredExifData[$prop] ) <= 8 ) {
+ // invalid. Must be at least 9 bytes long.
+
+ $this->debug( $this->mFilteredExifData[$prop], __FUNCTION__, false );
+ unset( $this->mFilteredExifData[$prop] );
+
+ return;
+ }
+ $charCode = substr( $this->mFilteredExifData[$prop], 0, 8 );
+ $val = substr( $this->mFilteredExifData[$prop], 8 );
+
+ switch ( $charCode ) {
+ case "\x4A\x49\x53\x00\x00\x00\x00\x00":
+ // JIS
+ $charset = "Shift-JIS";
+ break;
+ case "UNICODE\x00":
+ $charset = "UTF-16" . $this->byteOrder;
+ break;
+ default: // ascii or undefined.
+ $charset = "";
+ break;
+ }
+ if ( $charset ) {
+ MediaWiki\suppressWarnings();
+ $val = iconv( $charset, 'UTF-8//IGNORE', $val );
+ MediaWiki\restoreWarnings();
+ } else {
+ // if valid utf-8, assume that, otherwise assume windows-1252
+ $valCopy = $val;
+ UtfNormal\Validator::quickIsNFCVerify( $valCopy ); // validates $valCopy.
+ if ( $valCopy !== $val ) {
+ MediaWiki\suppressWarnings();
+ $val = iconv( 'Windows-1252', 'UTF-8//IGNORE', $val );
+ MediaWiki\restoreWarnings();
+ }
+ }
+
+ // trim and check to make sure not only whitespace.
+ $val = trim( $val );
+ if ( strlen( $val ) === 0 ) {
+ // only whitespace.
+ $this->debug( $this->mFilteredExifData[$prop], __FUNCTION__, "$prop: Is only whitespace" );
+ unset( $this->mFilteredExifData[$prop] );
+
+ return;
+ }
+
+ // all's good.
+ $this->mFilteredExifData[$prop] = $val;
+ }
+ }
+
+ /**
+ * Convert an Exif::UNDEFINED from a raw binary string
+ * to its value. This is sometimes needed depending on
+ * the type of UNDEFINED field
+ * @param string $prop Name of property
+ */
+ private function exifPropToOrd( $prop ) {
+ if ( isset( $this->mFilteredExifData[$prop] ) ) {
+ $this->mFilteredExifData[$prop] = ord( $this->mFilteredExifData[$prop] );
+ }
+ }
+
+ /**
+ * Convert gps in exif form to a single floating point number
+ * for example 10 degress 20`40`` S -> -10.34444
+ * @param string $prop A GPS coordinate exif tag name (like GPSLongitude)
+ */
+ private function exifGPStoNumber( $prop ) {
+ $loc =& $this->mFilteredExifData[$prop];
+ $dir =& $this->mFilteredExifData[$prop . 'Ref'];
+ $res = false;
+
+ if ( isset( $loc ) && isset( $dir )
+ && ( $dir === 'N' || $dir === 'S' || $dir === 'E' || $dir === 'W' )
+ ) {
+ list( $num, $denom ) = explode( '/', $loc[0] );
+ $res = $num / $denom;
+ list( $num, $denom ) = explode( '/', $loc[1] );
+ $res += ( $num / $denom ) * ( 1 / 60 );
+ list( $num, $denom ) = explode( '/', $loc[2] );
+ $res += ( $num / $denom ) * ( 1 / 3600 );
+
+ if ( $dir === 'S' || $dir === 'W' ) {
+ $res *= -1; // make negative
+ }
+ }
+
+ // update the exif records.
+
+ if ( $res !== false ) { // using !== as $res could potentially be 0
+ $this->mFilteredExifData[$prop] = $res;
+ unset( $this->mFilteredExifData[$prop . 'Ref'] );
+ } else { // if invalid
+ unset( $this->mFilteredExifData[$prop] );
+ unset( $this->mFilteredExifData[$prop . 'Ref'] );
+ }
+ }
+
+ /**#@-*/
+
+ /**#@+
+ * @return array
+ */
+ /**
+ * Get $this->mRawExifData
+ * @return array
+ */
+ function getData() {
+ return $this->mRawExifData;
+ }
+
+ /**
+ * Get $this->mFilteredExifData
+ * @return array
+ */
+ function getFilteredData() {
+ return $this->mFilteredExifData;
+ }
+
+ /**#@-*/
+
+ /**
+ * 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
+ */
+ public static function version() {
+ return 2; // We don't need no bloddy constants!
+ }
+
+ /**
+ * Validates if a tag value is of the type it should be according to the Exif spec
+ *
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private 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;
+ }
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private 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;
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private 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;
+ }
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private 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;
+ }
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private function isRational( $in ) {
+ $m = [];
+
+ # Avoid division by zero
+ if ( !is_array( $in )
+ && preg_match( '/^(\d+)\/(\d+[1-9]|[1-9]\d*)$/', $in, $m )
+ ) {
+ return $this->isLong( $m[1] ) && $this->isLong( $m[2] );
+ } else {
+ $this->debug( $in, __FUNCTION__, 'fed a non-fraction value' );
+
+ return false;
+ }
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private function isUndefined( $in ) {
+ $this->debug( $in, __FUNCTION__, true );
+
+ return true;
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private function isSlong( $in ) {
+ if ( $this->isLong( abs( $in ) ) ) {
+ $this->debug( $in, __FUNCTION__, true );
+
+ return true;
+ } else {
+ $this->debug( $in, __FUNCTION__, false );
+
+ return false;
+ }
+ }
+
+ /**
+ * @param mixed $in The input value to check
+ * @return bool
+ */
+ private function isSrational( $in ) {
+ $m = [];
+
+ # Avoid division by zero
+ if ( !is_array( $in ) &&
+ preg_match( '/^(-?\d+)\/(\d+[1-9]|[1-9]\d*)$/', $in, $m )
+ ) {
+ 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
+ *
+ * @param string $section Section where tag is located.
+ * @param string $tag The tag to check.
+ * @param mixed $val The value of the tag.
+ * @param bool $recursive True if called recursively for array types.
+ * @return bool
+ */
+ private function validate( $section, $tag, $val, $recursive = false ) {
+ $debug = "tag is '$tag'";
+ $etype = $this->mExifTags[$section][$tag];
+ $ecount = 1;
+ if ( is_array( $etype ) ) {
+ list( $etype, $ecount ) = $etype;
+ if ( $recursive ) {
+ $ecount = 1; // checking individual elements
+ }
+ }
+ $count = count( $val );
+ if ( $ecount != $count ) {
+ $this->debug( $val, __FUNCTION__, "Expected $ecount elements for $tag but got $count" );
+
+ return false;
+ }
+ if ( $count > 1 ) {
+ foreach ( $val as $v ) {
+ if ( !$this->validate( $section, $tag, $v, true ) ) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+ // Does not work if not typecast
+ switch ( (string)$etype ) {
+ case (string)self::BYTE:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isByte( $val );
+ case (string)self::ASCII:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isASCII( $val );
+ case (string)self::SHORT:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isShort( $val );
+ case (string)self::LONG:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isLong( $val );
+ case (string)self::RATIONAL:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isRational( $val );
+ case (string)self::SHORT_OR_LONG:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isShort( $val ) || $this->isLong( $val );
+ case (string)self::UNDEFINED:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isUndefined( $val );
+ case (string)self::SLONG:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isSlong( $val );
+ case (string)self::SRATIONAL:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return $this->isSrational( $val );
+ case (string)self::IGNORE:
+ $this->debug( $val, __FUNCTION__, $debug );
+
+ return false;
+ default:
+ $this->debug( $val, __FUNCTION__, "The tag '$tag' is unknown" );
+
+ return false;
+ }
+ }
+
+ /**
+ * Convenience function for debugging output
+ *
+ * @param mixed $in Arrays will be processed with print_r().
+ * @param string $fname Function name to log.
+ * @param string|bool|null $action Default null.
+ */
+ private function debug( $in, $fname, $action = null ) {
+ if ( !$this->log ) {
+ return;
+ }
+ $type = gettype( $in );
+ $class = ucfirst( __CLASS__ );
+ if ( is_array( $in ) ) {
+ $in = print_r( $in, true );
+ }
+
+ if ( $action === true ) {
+ wfDebugLog( $this->log, "$class::$fname: accepted: '$in' (type: $type)" );
+ } elseif ( $action === false ) {
+ wfDebugLog( $this->log, "$class::$fname: rejected: '$in' (type: $type)" );
+ } elseif ( $action === null ) {
+ wfDebugLog( $this->log, "$class::$fname: input was: '$in' (type: $type)" );
+ } else {
+ wfDebugLog( $this->log, "$class::$fname: $action (type: $type; content: '$in')" );
+ }
+ }
+
+ /**
+ * Convenience function for debugging output
+ *
+ * @param string $fname The name of the function calling this function
+ * @param bool $io Specify whether we're beginning or ending
+ */
+ private function debugFile( $fname, $io ) {
+ if ( !$this->log ) {
+ return;
+ }
+ $class = ucfirst( __CLASS__ );
+ if ( $io ) {
+ wfDebugLog( $this->log, "$class::$fname: begin processing: '{$this->basename}'" );
+ } else {
+ wfDebugLog( $this->log, "$class::$fname: end processing: '{$this->basename}'" );
+ }
+ }
+}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff