1106 lines
31 KiB
PHP
1106 lines
31 KiB
PHP
<?php
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/**
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* @package MediaWiki
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* @subpackage Metadata
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*
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* @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
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* @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason
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* @license http://www.gnu.org/copyleft/gpl.html GNU General Public License
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification
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* @bug 1555, 1947
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*/
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/**#@+
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* Exif tag type definition
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*/
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define('MW_EXIF_BYTE', 1); # An 8-bit (1-byte) unsigned integer.
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define('MW_EXIF_ASCII', 2); # An 8-bit byte containing one 7-bit ASCII code. The final byte is terminated with NULL.
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define('MW_EXIF_SHORT', 3); # A 16-bit (2-byte) unsigned integer.
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define('MW_EXIF_LONG', 4); # A 32-bit (4-byte) unsigned integer.
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define('MW_EXIF_RATIONAL', 5); # Two LONGs. The first LONG is the numerator and the second LONG expresses the denominator
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define('MW_EXIF_UNDEFINED', 7); # An 8-bit byte that can take any value depending on the field definition
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define('MW_EXIF_SLONG', 9); # A 32-bit (4-byte) signed integer (2's complement notation),
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define('MW_EXIF_SRATIONAL', 10); # Two SLONGs. The first SLONG is the numerator and the second SLONG is the denominator.
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/**#@-*/
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/**
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* @package MediaWiki
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* @subpackage Metadata
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*/
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class Exif {
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/**#@+
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* @var array
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* @access private
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*/
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/**
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* Exif tags grouped by category, the tagname itself is the key and the type
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* is the value, in the case of more than one possible value type they are
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* seperated by commas.
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*/
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var $mExifTags;
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/**
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* A one dimentional array of all Exif tags
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*/
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var $mFlatExifTags;
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/**
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* The raw Exif data returned by exif_read_data()
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*/
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var $mRawExifData;
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/**
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* A Filtered version of $mRawExifData that has been pruned of invalid
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* tags and tags that contain content they shouldn't contain according
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* to the Exif specification
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*/
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var $mFilteredExifData;
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/**
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* Filtered and formatted Exif data, see FormatExif::getFormattedData()
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*/
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var $mFormattedExifData;
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/**#@-*/
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/**#@+
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* @var string
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* @access private
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*/
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/**
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* The file being processed
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*/
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var $file;
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/**
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* The basename of the file being processed
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*/
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var $basename;
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/**
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* The private log to log to
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*/
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var $log = 'exif';
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/**#@-*/
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/**
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* Constructor
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*
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* @param string $file
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*/
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function Exif( $file ) {
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/**
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* Page numbers here refer to pages in the EXIF 2.2 standard
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*
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* @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification
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*/
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$this->mExifTags = array(
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# TIFF Rev. 6.0 Attribute Information (p22)
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'tiff' => array(
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# Tags relating to image structure
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'structure' => array(
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'ImageWidth' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Image width
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'ImageLength' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Image height
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'BitsPerSample' => MW_EXIF_SHORT, # Number of bits per component
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# "When a primary image is JPEG compressed, this designation is not"
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# "necessary and is omitted." (p23)
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'Compression' => MW_EXIF_SHORT, # Compression scheme #p23
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'PhotometricInterpretation' => MW_EXIF_SHORT, # Pixel composition #p23
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'Orientation' => MW_EXIF_SHORT, # Orientation of image #p24
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'SamplesPerPixel' => MW_EXIF_SHORT, # Number of components
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'PlanarConfiguration' => MW_EXIF_SHORT, # Image data arrangement #p24
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'YCbCrSubSampling' => MW_EXIF_SHORT, # Subsampling ratio of Y to C #p24
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'YCbCrPositioning' => MW_EXIF_SHORT, # Y and C positioning #p24-25
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'XResolution' => MW_EXIF_RATIONAL, # Image resolution in width direction
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'YResolution' => MW_EXIF_RATIONAL, # Image resolution in height direction
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'ResolutionUnit' => MW_EXIF_SHORT, # Unit of X and Y resolution #(p26)
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),
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# Tags relating to recording offset
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'offset' => array(
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'StripOffsets' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Image data location
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'RowsPerStrip' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Number of rows per strip
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'StripByteCounts' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Bytes per compressed strip
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'JPEGInterchangeFormat' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Offset to JPEG SOI
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'JPEGInterchangeFormatLength' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Bytes of JPEG data
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),
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# Tags relating to image data characteristics
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'characteristics' => array(
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'TransferFunction' => MW_EXIF_SHORT, # Transfer function
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'WhitePoint' => MW_EXIF_RATIONAL, # White point chromaticity
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'PrimaryChromaticities' => MW_EXIF_RATIONAL, # Chromaticities of primarities
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'YCbCrCoefficients' => MW_EXIF_RATIONAL, # Color space transformation matrix coefficients #p27
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'ReferenceBlackWhite' => MW_EXIF_RATIONAL # Pair of black and white reference values
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),
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# Other tags
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'other' => array(
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'DateTime' => MW_EXIF_ASCII, # File change date and time
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'ImageDescription' => MW_EXIF_ASCII, # Image title
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'Make' => MW_EXIF_ASCII, # Image input equipment manufacturer
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'Model' => MW_EXIF_ASCII, # Image input equipment model
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'Software' => MW_EXIF_ASCII, # Software used
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'Artist' => MW_EXIF_ASCII, # Person who created the image
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'Copyright' => MW_EXIF_ASCII, # Copyright holder
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),
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),
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# Exif IFD Attribute Information (p30-31)
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'exif' => array(
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# Tags relating to version
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'version' => array(
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# TODO: NOTE: Nonexistence of this field is taken to mean nonconformance
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# to the EXIF 2.1 AND 2.2 standards
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'ExifVersion' => MW_EXIF_UNDEFINED, # Exif version
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'FlashpixVersion' => MW_EXIF_UNDEFINED, # Supported Flashpix version #p32
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),
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# Tags relating to Image Data Characteristics
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'characteristics' => array(
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'ColorSpace' => MW_EXIF_SHORT, # Color space information #p32
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),
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# Tags relating to image configuration
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'configuration' => array(
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'ComponentsConfiguration' => MW_EXIF_UNDEFINED, # Meaning of each component #p33
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'CompressedBitsPerPixel' => MW_EXIF_RATIONAL, # Image compression mode
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'PixelYDimension' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Valid image width
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'PixelXDimension' => MW_EXIF_SHORT.','.MW_EXIF_LONG, # Valind image height
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),
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# Tags relating to related user information
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'user' => array(
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'MakerNote' => MW_EXIF_UNDEFINED, # Manufacturer notes
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'UserComment' => MW_EXIF_UNDEFINED, # User comments #p34
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),
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# Tags relating to related file information
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'related' => array(
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'RelatedSoundFile' => MW_EXIF_ASCII, # Related audio file
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),
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# Tags relating to date and time
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'dateandtime' => array(
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'DateTimeOriginal' => MW_EXIF_ASCII, # Date and time of original data generation #p36
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'DateTimeDigitized' => MW_EXIF_ASCII, # Date and time of original data generation
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'SubSecTime' => MW_EXIF_ASCII, # DateTime subseconds
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'SubSecTimeOriginal' => MW_EXIF_ASCII, # DateTimeOriginal subseconds
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'SubSecTimeDigitized' => MW_EXIF_ASCII, # DateTimeDigitized subseconds
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),
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# Tags relating to picture-taking conditions (p31)
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'conditions' => array(
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'ExposureTime' => MW_EXIF_RATIONAL, # Exposure time
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'FNumber' => MW_EXIF_RATIONAL, # F Number
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'ExposureProgram' => MW_EXIF_SHORT, # Exposure Program #p38
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'SpectralSensitivity' => MW_EXIF_ASCII, # Spectral sensitivity
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'ISOSpeedRatings' => MW_EXIF_SHORT, # ISO speed rating
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'OECF' => MW_EXIF_UNDEFINED, # Optoelectronic conversion factor
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'ShutterSpeedValue' => MW_EXIF_SRATIONAL, # Shutter speed
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'ApertureValue' => MW_EXIF_RATIONAL, # Aperture
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'BrightnessValue' => MW_EXIF_SRATIONAL, # Brightness
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'ExposureBiasValue' => MW_EXIF_SRATIONAL, # Exposure bias
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'MaxApertureValue' => MW_EXIF_RATIONAL, # Maximum land aperture
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'SubjectDistance' => MW_EXIF_RATIONAL, # Subject distance
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'MeteringMode' => MW_EXIF_SHORT, # Metering mode #p40
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'LightSource' => MW_EXIF_SHORT, # Light source #p40-41
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'Flash' => MW_EXIF_SHORT, # Flash #p41-42
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'FocalLength' => MW_EXIF_RATIONAL, # Lens focal length
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'SubjectArea' => MW_EXIF_SHORT, # Subject area
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'FlashEnergy' => MW_EXIF_RATIONAL, # Flash energy
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'SpatialFrequencyResponse' => MW_EXIF_UNDEFINED, # Spatial frequency response
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'FocalPlaneXResolution' => MW_EXIF_RATIONAL, # Focal plane X resolution
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'FocalPlaneYResolution' => MW_EXIF_RATIONAL, # Focal plane Y resolution
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'FocalPlaneResolutionUnit' => MW_EXIF_SHORT, # Focal plane resolution unit #p46
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'SubjectLocation' => MW_EXIF_SHORT, # Subject location
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'ExposureIndex' => MW_EXIF_RATIONAL, # Exposure index
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'SensingMethod' => MW_EXIF_SHORT, # Sensing method #p46
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'FileSource' => MW_EXIF_UNDEFINED, # File source #p47
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'SceneType' => MW_EXIF_UNDEFINED, # Scene type #p47
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'CFAPattern' => MW_EXIF_UNDEFINED, # CFA pattern
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'CustomRendered' => MW_EXIF_SHORT, # Custom image processing #p48
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'ExposureMode' => MW_EXIF_SHORT, # Exposure mode #p48
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'WhiteBalance' => MW_EXIF_SHORT, # White Balance #p49
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'DigitalZoomRatio' => MW_EXIF_RATIONAL, # Digital zoom ration
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'FocalLengthIn35mmFilm' => MW_EXIF_SHORT, # Focal length in 35 mm film
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'SceneCaptureType' => MW_EXIF_SHORT, # Scene capture type #p49
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'GainControl' => MW_EXIF_RATIONAL, # Scene control #p49-50
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'Contrast' => MW_EXIF_SHORT, # Contrast #p50
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'Saturation' => MW_EXIF_SHORT, # Saturation #p50
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'Sharpness' => MW_EXIF_SHORT, # Sharpness #p50
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'DeviceSettingDescription' => MW_EXIF_UNDEFINED, # Desice settings description
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'SubjectDistanceRange' => MW_EXIF_SHORT, # Subject distance range #p51
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),
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'other' => array(
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'ImageUniqueID' => MW_EXIF_ASCII, # Unique image ID
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),
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),
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# GPS Attribute Information (p52)
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'gps' => array(
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'GPSVersionID' => MW_EXIF_BYTE, # GPS tag version
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'GPSLatitudeRef' => MW_EXIF_ASCII, # North or South Latitude #p52-53
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'GPSLatitude' => MW_EXIF_RATIONAL, # Latitude
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'GPSLongitudeRef' => MW_EXIF_ASCII, # East or West Longitude #p53
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'GPSLongitude' => MW_EXIF_RATIONAL, # Longitude
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'GPSAltitudeRef' => MW_EXIF_BYTE, # Altitude reference
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'GPSAltitude' => MW_EXIF_RATIONAL, # Altitude
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'GPSTimeStamp' => MW_EXIF_RATIONAL, # GPS time (atomic clock)
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'GPSSatellites' => MW_EXIF_ASCII, # Satellites used for measurement
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'GPSStatus' => MW_EXIF_ASCII, # Receiver status #p54
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'GPSMeasureMode' => MW_EXIF_ASCII, # Measurement mode #p54-55
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'GPSDOP' => MW_EXIF_RATIONAL, # Measurement precision
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'GPSSpeedRef' => MW_EXIF_ASCII, # Speed unit #p55
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'GPSSpeed' => MW_EXIF_RATIONAL, # Speed of GPS receiver
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'GPSTrackRef' => MW_EXIF_ASCII, # Reference for direction of movement #p55
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'GPSTrack' => MW_EXIF_RATIONAL, # Direction of movement
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'GPSImgDirectionRef' => MW_EXIF_ASCII, # Reference for direction of image #p56
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'GPSImgDirection' => MW_EXIF_RATIONAL, # Direction of image
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'GPSMapDatum' => MW_EXIF_ASCII, # Geodetic survey data used
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'GPSDestLatitudeRef' => MW_EXIF_ASCII, # Reference for latitude of destination #p56
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'GPSDestLatitude' => MW_EXIF_RATIONAL, # Latitude destination
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'GPSDestLongitudeRef' => MW_EXIF_ASCII, # Reference for longitude of destination #p57
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'GPSDestLongitude' => MW_EXIF_RATIONAL, # Longitude of destination
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'GPSDestBearingRef' => MW_EXIF_ASCII, # Reference for bearing of destination #p57
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'GPSDestBearing' => MW_EXIF_RATIONAL, # Bearing of destination
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'GPSDestDistanceRef' => MW_EXIF_ASCII, # Reference for distance to destination #p57-58
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'GPSDestDistance' => MW_EXIF_RATIONAL, # Distance to destination
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'GPSProcessingMethod' => MW_EXIF_UNDEFINED, # Name of GPS processing method
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'GPSAreaInformation' => MW_EXIF_UNDEFINED, # Name of GPS area
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'GPSDateStamp' => MW_EXIF_ASCII, # GPS date
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'GPSDifferential' => MW_EXIF_SHORT, # GPS differential correction
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),
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);
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$this->file = $file;
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$this->basename = basename( $this->file );
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$this->makeFlatExifTags();
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$this->debugFile( $this->basename, __FUNCTION__, true );
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wfSuppressWarnings();
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$data = exif_read_data( $this->file );
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wfRestoreWarnings();
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/**
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* exif_read_data() will return false on invalid input, such as
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* when somebody uploads a file called something.jpeg
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* containing random gibberish.
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*/
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$this->mRawExifData = $data ? $data : array();
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$this->makeFilteredData();
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$this->makeFormattedData();
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$this->debugFile( __FUNCTION__, false );
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}
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/**#@+
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* @access private
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*/
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/**
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* Generate a flat list of the exif tags
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*/
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function makeFlatExifTags() {
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$this->extractTags( $this->mExifTags );
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}
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/**
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* A recursing extractor function used by makeFlatExifTags()
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*
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* Note: This used to use an array_walk function, but it made PHP5
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* segfault, see `cvs diff -u -r 1.4 -r 1.5 Exif.php`
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*/
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function extractTags( &$tagset ) {
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foreach( $tagset as $key => $val ) {
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if( is_array( $val ) ) {
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$this->extractTags( $val );
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} else {
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$this->mFlatExifTags[$key] = $val;
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}
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}
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}
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/**
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* Make $this->mFilteredExifData
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*/
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function makeFilteredData() {
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$this->mFilteredExifData = $this->mRawExifData;
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foreach( $this->mFilteredExifData as $k => $v ) {
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if ( !in_array( $k, array_keys( $this->mFlatExifTags ) ) ) {
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$this->debug( $v, __FUNCTION__, "'$k' is not a valid Exif tag" );
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unset( $this->mFilteredExifData[$k] );
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}
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}
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foreach( $this->mFilteredExifData as $k => $v ) {
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if ( !$this->validate($k, $v) ) {
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$this->debug( $v, __FUNCTION__, "'$k' contained invalid data" );
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unset( $this->mFilteredExifData[$k] );
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}
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}
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}
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function makeFormattedData( $data = null ) {
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$format = new FormatExif( $this->getFilteredData() );
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$this->mFormattedExifData = $format->getFormattedData();
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}
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/**#@-*/
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/**#@+
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* @return array
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*/
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/**
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* Get $this->mRawExifData
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*/
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function getData() {
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return $this->mRawExifData;
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}
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/**
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* Get $this->mFilteredExifData
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*/
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function getFilteredData() {
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return $this->mFilteredExifData;
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}
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/**
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* Get $this->mFormattedExifData
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*/
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function getFormattedData() {
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return $this->mFormattedExifData;
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}
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/**#@-*/
|
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/**
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* The version of the output format
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*
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* Before the actual metadata information is saved in the database we
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* strip some of it since we don't want to save things like thumbnails
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* which usually accompany Exif data. This value gets saved in the
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* database along with the actual Exif data, and if the version in the
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* database doesn't equal the value returned by this function the Exif
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* data is regenerated.
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*
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* @return int
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*/
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function version() {
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return 1; // We don't need no bloddy constants!
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}
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/**#@+
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* Validates if a tag value is of the type it should be according to the Exif spec
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*
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* @access private
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*
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* @param mixed $in The input value to check
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* @return bool
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*/
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function isByte( $in ) {
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if ( sprintf('%d', $in) == $in && $in >= 0 && $in <= 255 ) {
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$this->debug( $in, __FUNCTION__, true );
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return true;
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} else {
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$this->debug( $in, __FUNCTION__, false );
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return false;
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}
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}
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function isASCII( $in ) {
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if ( preg_match( "/[^\x0a\x20-\x7e]/", $in ) ) {
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$this->debug( $in, __FUNCTION__, 'found a character not in our whitelist' );
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return false;
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}
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if ( preg_match( "/^\s*$/", $in ) ) {
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$this->debug( $in, __FUNCTION__, 'input consisted solely of whitespace' );
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return false;
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}
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return true;
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}
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function isShort( $in ) {
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if ( sprintf('%d', $in) == $in && $in >= 0 && $in <= 65536 ) {
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$this->debug( $in, __FUNCTION__, true );
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return true;
|
|
} else {
|
|
$this->debug( $in, __FUNCTION__, false );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
function isLong( $in ) {
|
|
if ( 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( $in ) {
|
|
if ( @preg_match( "/^(\d+)\/(\d+[1-9]|[1-9]\d*)$/", $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( $in ) {
|
|
if ( preg_match( "/^\d{4}$/", $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( $in ) {
|
|
if ( preg_match( "/^(\d+)\/(\d+[1-9]|[1-9]\d*)$/", $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
|
|
*
|
|
* @access private
|
|
*
|
|
* @param string $tag The tag to check
|
|
* @param mixed $val The value of the tag
|
|
* @return bool
|
|
*/
|
|
function validate( $tag, $val ) {
|
|
$debug = "tag is '$tag'";
|
|
// Fucks up if not typecast
|
|
switch( (string)$this->mFlatExifTags[$tag] ) {
|
|
case (string)MW_EXIF_BYTE:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isByte( $val );
|
|
case (string)MW_EXIF_ASCII:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isASCII( $val );
|
|
case (string)MW_EXIF_SHORT:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isShort( $val );
|
|
case (string)MW_EXIF_LONG:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isLong( $val );
|
|
case (string)MW_EXIF_RATIONAL:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isRational( $val );
|
|
case (string)MW_EXIF_UNDEFINED:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isUndefined( $val );
|
|
case (string)MW_EXIF_SLONG:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isSlong( $val );
|
|
case (string)MW_EXIF_SRATIONAL:
|
|
$this->debug( $val, __FUNCTION__, $debug );
|
|
return $this->isSrational( $val );
|
|
case (string)MW_EXIF_SHORT.','.MW_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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Conviniance function for debugging output
|
|
*
|
|
* @access private
|
|
*
|
|
* @param mixed $in
|
|
* @param string $fname
|
|
* @param mixed $action
|
|
*/
|
|
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");
|
|
}
|
|
|
|
/**
|
|
* Conviniance function for debugging output
|
|
*
|
|
* @access private
|
|
*
|
|
* @param string $basename The name of the file being processed
|
|
* @paran string $fname The name of the function calling this function
|
|
* @param bool $bool $io 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
|
|
* @access private
|
|
*/
|
|
var $mExif;
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* @param array $exif 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;
|
|
}
|
|
|
|
/**
|
|
* Conviniance function for getFormattedData()
|
|
*
|
|
* @access private
|
|
*
|
|
* @param string $tag The tag name to pass on
|
|
* @param string $val The value of the tag
|
|
* @param string $arg 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
|
|
*
|
|
* @access private
|
|
*
|
|
* @param mixed $num 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
|
|
*
|
|
* @access private
|
|
*
|
|
* @param mixed $num 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 int $a
|
|
* @param int $b
|
|
* @return int
|
|
* @access 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;
|
|
}
|
|
}
|
|
?>
|