Your IP : 108.162.216.192
<?php
/**
* 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
* @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
*/
/**
* @todo document (e.g. one-sentence class-overview description)
* @ingroup Media
*/
class Exif {
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.
//@{
/* @var array
* @private
*/
/**
* 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.
*/
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, e.g. 'exif'
*/
var $log = false;
//@}
/**
* Constructor
*
* @param $file String: filename.
*/
function __construct( $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 = wfBaseName( $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
*/
public static 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 ) {
$m = array();
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 ) {
$m = array();
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, $action = null ) {
if ( !$this->log ) {
return;
}
$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, $io ) {
if ( !$this->log ) {
return;
}
$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" );
}
}
}
/**
* @todo document (e.g. one-sentence class-overview description)
* @ingroup Media
*/
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( $val == '0000:00:00 00:00:00' ) {
$tags[$tag] = wfMsg('exif-unknowndate');
} elseif( 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;
case 'Flash':
$flashDecode = array(
'fired' => $val & bindec( '00000001' ),
'return' => ($val & bindec( '00000110' )) >> 1,
'mode' => ($val & bindec( '00011000' )) >> 3,
'function' => ($val & bindec( '00100000' )) >> 5,
'redeye' => ($val & bindec( '01000000' )) >> 6,
// 'reserved' => ($val & bindec( '10000000' )) >> 7,
);
# We do not need to handle unknown values since all are used.
foreach( $flashDecode as $subTag => $subValue ) {
# We do not need any message for zeroed values.
if( $subTag != 'fired' && $subValue == 0) {
continue;
}
$fullTag = $tag . '-' . $subTag ;
$flashMsgs[] = $this->msg( $fullTag, $subValue );
}
$tags[$tag] = $wgLang->commaList( $flashMsgs );
break;
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;
// Do not transform fields with pure text.
// For some languages the formatNum() conversion results to wrong output like
// foo,bar@example,com or foo٫bar@example٫com
case 'ImageDescription':
case 'Artist':
case 'Copyright':
$tags[$tag] = htmlspecialchars( $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 ) {
global $wgLang;
$m = array();
if ( preg_match( '/^(\d+)\/(\d+)$/', $num, $m ) )
return $wgLang->formatNum( $m[2] != 0 ? $m[1] / $m[2] : $num );
else
return $wgLang->formatNum( $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 ) {
$m = array();
if ( preg_match( '/^(\d+)\/(\d+)$/', $num, $m ) ) {
$numerator = intval( $m[1] );
$denominator = intval( $m[2] );
$gcd = $this->gcd( $numerator, $denominator );
if( $gcd != 0 ) {
// 0 shouldn't happen! ;)
return $this->formatNum( $numerator / $gcd ) . '/' . $this->formatNum( $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 );