91fedb08bc
- Handle GPS tags with decimal rational number instead of array of dms rationals - Mod the decimal values - Increase validation on GPS tag format Bug: T386208 Change-Id: Ief823af317bbb01b4a05e34b1d189ce1deaa1f33 (cherry picked from commit 55ffc43a596c0547986322ffe679d37daa921be7)
991 lines
30 KiB
PHP
991 lines
30 KiB
PHP
<?php
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/**
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* Extraction and validation of image metadata.
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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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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @ingroup Media
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* @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
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* @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason, 2009 Brent Garber
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* @license GPL-2.0-or-later
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* @see http://exif.org/Exif2-2.PDF The Exif 2.2 specification
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* @file
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*/
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use MediaWiki\Config\ConfigException;
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use Wikimedia\AtEase\AtEase;
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/**
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* Class to extract and validate Exif data from jpeg (and possibly tiff) files.
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* @ingroup Media
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*/
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class Exif {
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/** An 8-bit (1-byte) unsigned integer. */
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private const BYTE = 1;
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/** An 8-bit byte containing one 7-bit ASCII code.
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* The final byte is terminated with NULL.
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*/
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private const ASCII = 2;
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/** A 16-bit (2-byte) unsigned integer. */
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private const SHORT = 3;
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/** A 32-bit (4-byte) unsigned integer. */
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private const LONG = 4;
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/** Two LONGs. The first LONG is the numerator and the second LONG expresses
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* the denominator
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*/
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private const RATIONAL = 5;
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/** A 16-bit (2-byte) or 32-bit (4-byte) unsigned integer. */
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private const SHORT_OR_LONG = 6;
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/** An 8-bit byte that can take any value depending on the field definition */
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private const UNDEFINED = 7;
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/** A 32-bit (4-byte) signed integer (2's complement notation), */
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private const SLONG = 9;
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/** Two SLONGs. The first SLONG is the numerator and the second SLONG is
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* the denominator.
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*/
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private const SRATIONAL = 10;
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/** A fake value for things we don't want or don't support. */
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private const IGNORE = -1;
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/** @var array Exif tags grouped by category, the tagname itself is the key
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* and the type is the value, in the case of more than one possible value
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* type they are separated by commas.
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*/
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private $mExifTags;
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/** @var array The raw Exif data returned by exif_read_data() */
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private $mRawExifData;
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/** @var array A Filtered version of $mRawExifData that has been pruned
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* of invalid tags and tags that contain content they shouldn't contain
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* according to the Exif specification
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*/
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private $mFilteredExifData;
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/** @var string The file being processed */
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private $file;
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/** @var string The basename of the file being processed */
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private $basename;
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/** @var string|false The private log to log to, e.g. 'exif' */
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private $log = false;
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/** @var string The byte order of the file. Needed because php's extension
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* doesn't fully process some obscure props.
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*/
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private $byteOrder;
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/**
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* @param string $file Filename.
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* @param string $byteOrder Type of byte ordering either 'BE' (Big Endian)
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* or 'LE' (Little Endian). Default ''.
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* @todo FIXME: The following are broke:
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* SubjectArea. Need to test the more obscure tags.
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* DigitalZoomRatio = 0/0 is rejected. need to determine if that's valid.
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* Possibly should treat 0/0 = 0. need to read exif spec on that.
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*/
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public function __construct( $file, $byteOrder = '' ) {
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/**
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* Page numbers here refer to pages in the Exif 2.2 standard
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*
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* Note, Exif::UNDEFINED is treated as a string, not as an array of bytes
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* so don't put a count parameter for any UNDEFINED values.
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*
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* @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification
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*/
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$this->mExifTags = [
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# TIFF Rev. 6.0 Attribute Information (p22)
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'IFD0' => [
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# Tags relating to image structure
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# Image width
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'ImageWidth' => self::SHORT_OR_LONG,
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# Image height
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'ImageLength' => self::SHORT_OR_LONG,
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# Number of bits per component
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'BitsPerSample' => [ self::SHORT, 3 ],
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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 scheme #p23
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'Compression' => self::SHORT,
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# Pixel composition #p23
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'PhotometricInterpretation' => self::SHORT,
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# Orientation of image #p24
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'Orientation' => self::SHORT,
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# Number of components
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'SamplesPerPixel' => self::SHORT,
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# Image data arrangement #p24
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'PlanarConfiguration' => self::SHORT,
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# Subsampling ratio of Y to C #p24
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'YCbCrSubSampling' => [ self::SHORT, 2 ],
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# Y and C positioning #p24-25
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'YCbCrPositioning' => self::SHORT,
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# Image resolution in width direction
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'XResolution' => self::RATIONAL,
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# Image resolution in height direction
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'YResolution' => self::RATIONAL,
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# Unit of X and Y resolution #(p26)
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'ResolutionUnit' => self::SHORT,
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# Tags relating to recording offset
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# Image data location
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'StripOffsets' => self::SHORT_OR_LONG,
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# Number of rows per strip
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'RowsPerStrip' => self::SHORT_OR_LONG,
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# Bytes per compressed strip
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'StripByteCounts' => self::SHORT_OR_LONG,
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# Offset to JPEG SOI
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'JPEGInterchangeFormat' => self::SHORT_OR_LONG,
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# Bytes of JPEG data
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'JPEGInterchangeFormatLength' => self::SHORT_OR_LONG,
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# Tags relating to image data characteristics
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# Transfer function
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'TransferFunction' => self::IGNORE,
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# White point chromaticity
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'WhitePoint' => [ self::RATIONAL, 2 ],
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# Chromaticities of primarities
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'PrimaryChromaticities' => [ self::RATIONAL, 6 ],
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# Color space transformation matrix coefficients #p27
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'YCbCrCoefficients' => [ self::RATIONAL, 3 ],
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# Pair of black and white reference values
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'ReferenceBlackWhite' => [ self::RATIONAL, 6 ],
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# Other tags
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# File change date and time
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'DateTime' => self::ASCII,
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# Image title
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'ImageDescription' => self::ASCII,
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# Image input equipment manufacturer
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'Make' => self::ASCII,
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# Image input equipment model
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'Model' => self::ASCII,
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# Software used
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'Software' => self::ASCII,
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# Person who created the image
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'Artist' => self::ASCII,
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# Copyright holder
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'Copyright' => self::ASCII,
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],
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# Exif IFD Attribute Information (p30-31)
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'EXIF' => [
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# @todo NOTE: Nonexistence of this field is taken to mean non-conformance
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# to the Exif 2.1 AND 2.2 standards
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'ExifVersion' => self::UNDEFINED,
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# Supported Flashpix version #p32
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'FlashPixVersion' => self::UNDEFINED,
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# Tags relating to Image Data Characteristics
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# Color space information #p32
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'ColorSpace' => self::SHORT,
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# Tags relating to image configuration
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# Meaning of each component #p33
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'ComponentsConfiguration' => self::UNDEFINED,
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# Image compression mode
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'CompressedBitsPerPixel' => self::RATIONAL,
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# Valid image height
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'PixelYDimension' => self::SHORT_OR_LONG,
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# Valid image width
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'PixelXDimension' => self::SHORT_OR_LONG,
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# Tags relating to related user information
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# Manufacturer notes
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'MakerNote' => self::IGNORE,
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# User comments #p34
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'UserComment' => self::UNDEFINED,
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# Tags relating to related file information
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# Related audio file
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'RelatedSoundFile' => self::ASCII,
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# Tags relating to date and time
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# Date and time of original data generation #p36
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'DateTimeOriginal' => self::ASCII,
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# Date and time of original data generation
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'DateTimeDigitized' => self::ASCII,
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# DateTime subseconds
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'SubSecTime' => self::ASCII,
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# DateTimeOriginal subseconds
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'SubSecTimeOriginal' => self::ASCII,
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# DateTimeDigitized subseconds
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'SubSecTimeDigitized' => self::ASCII,
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# Tags relating to picture-taking conditions (p31)
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# Exposure time
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'ExposureTime' => self::RATIONAL,
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# F Number
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'FNumber' => self::RATIONAL,
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# Exposure Program #p38
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'ExposureProgram' => self::SHORT,
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# Spectral sensitivity
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'SpectralSensitivity' => self::ASCII,
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# ISO speed rating
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'ISOSpeedRatings' => self::SHORT,
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# Optoelectronic conversion factor. Note: We don't have support for this atm.
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'OECF' => self::IGNORE,
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# Shutter speed
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'ShutterSpeedValue' => self::SRATIONAL,
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# Aperture
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'ApertureValue' => self::RATIONAL,
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# Brightness
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'BrightnessValue' => self::SRATIONAL,
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# Exposure bias
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'ExposureBiasValue' => self::SRATIONAL,
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# Maximum land aperture
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'MaxApertureValue' => self::RATIONAL,
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# Subject distance
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'SubjectDistance' => self::RATIONAL,
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# Metering mode #p40
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'MeteringMode' => self::SHORT,
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# Light source #p40-41
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'LightSource' => self::SHORT,
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# Flash #p41-42
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'Flash' => self::SHORT,
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# Lens focal length
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'FocalLength' => self::RATIONAL,
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# Subject area
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'SubjectArea' => [ self::SHORT, 4 ],
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# Flash energy
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'FlashEnergy' => self::RATIONAL,
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# Spatial frequency response. Not supported atm.
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'SpatialFrequencyResponse' => self::IGNORE,
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# Focal plane X resolution
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'FocalPlaneXResolution' => self::RATIONAL,
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# Focal plane Y resolution
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'FocalPlaneYResolution' => self::RATIONAL,
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# Focal plane resolution unit #p46
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'FocalPlaneResolutionUnit' => self::SHORT,
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# Subject location
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'SubjectLocation' => [ self::SHORT, 2 ],
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# Exposure index
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'ExposureIndex' => self::RATIONAL,
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# Sensing method #p46
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'SensingMethod' => self::SHORT,
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# File source #p47
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'FileSource' => self::UNDEFINED,
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# Scene type #p47
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'SceneType' => self::UNDEFINED,
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# CFA pattern. not supported atm.
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'CFAPattern' => self::IGNORE,
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# Custom image processing #p48
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'CustomRendered' => self::SHORT,
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# Exposure mode #p48
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'ExposureMode' => self::SHORT,
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# White Balance #p49
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'WhiteBalance' => self::SHORT,
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# Digital zoom ratio
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'DigitalZoomRatio' => self::RATIONAL,
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# Focal length in 35 mm film
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'FocalLengthIn35mmFilm' => self::SHORT,
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# Scene capture type #p49
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'SceneCaptureType' => self::SHORT,
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# Scene control #p49-50
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'GainControl' => self::SHORT,
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# Contrast #p50
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'Contrast' => self::SHORT,
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# Saturation #p50
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'Saturation' => self::SHORT,
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# Sharpness #p50
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'Sharpness' => self::SHORT,
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# Device settings description. This could maybe be supported. Need to find an
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# example file that uses this to see if it has stuff of interest in it.
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'DeviceSettingDescription' => self::IGNORE,
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# Subject distance range #p51
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'SubjectDistanceRange' => self::SHORT,
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# Unique image ID
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'ImageUniqueID' => self::ASCII,
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],
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# GPS Attribute Information (p52)
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'GPS' => [
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'GPSVersion' => self::UNDEFINED,
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# Should be an array of 4 Exif::BYTE's. However, php treats it as an undefined
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# Note exif standard calls this GPSVersionID, but php doesn't like the id suffix
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# North or South Latitude #p52-53
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'GPSLatitudeRef' => self::ASCII,
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# Latitude
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'GPSLatitude' => [ self::RATIONAL, 3 ],
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# East or West Longitude #p53
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'GPSLongitudeRef' => self::ASCII,
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# Longitude
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'GPSLongitude' => [ self::RATIONAL, 3 ],
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'GPSAltitudeRef' => self::UNDEFINED,
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# Altitude reference. Note, the exif standard says this should be an EXIF::Byte,
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# but php seems to disagree.
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# Altitude
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'GPSAltitude' => self::RATIONAL,
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# GPS time (atomic clock)
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'GPSTimeStamp' => [ self::RATIONAL, 3 ],
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# Satellites used for measurement
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'GPSSatellites' => self::ASCII,
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# Receiver status #p54
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'GPSStatus' => self::ASCII,
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# Measurement mode #p54-55
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'GPSMeasureMode' => self::ASCII,
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# Measurement precision
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'GPSDOP' => self::RATIONAL,
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# Speed unit #p55
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'GPSSpeedRef' => self::ASCII,
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# Speed of GPS receiver
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'GPSSpeed' => self::RATIONAL,
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# Reference for direction of movement #p55
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'GPSTrackRef' => self::ASCII,
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# Direction of movement
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'GPSTrack' => self::RATIONAL,
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# Reference for direction of image #p56
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'GPSImgDirectionRef' => self::ASCII,
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# Direction of image
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'GPSImgDirection' => self::RATIONAL,
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# Geodetic survey data used
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'GPSMapDatum' => self::ASCII,
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# Reference for latitude of destination #p56
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'GPSDestLatitudeRef' => self::ASCII,
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# Latitude destination
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'GPSDestLatitude' => [ self::RATIONAL, 3 ],
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# Reference for longitude of destination #p57
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'GPSDestLongitudeRef' => self::ASCII,
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# Longitude of destination
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'GPSDestLongitude' => [ self::RATIONAL, 3 ],
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# Reference for bearing of destination #p57
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'GPSDestBearingRef' => self::ASCII,
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# Bearing of destination
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'GPSDestBearing' => self::RATIONAL,
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# Reference for distance to destination #p57-58
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'GPSDestDistanceRef' => self::ASCII,
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# Distance to destination
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'GPSDestDistance' => self::RATIONAL,
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# Name of GPS processing method
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'GPSProcessingMethod' => self::UNDEFINED,
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# Name of GPS area
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'GPSAreaInformation' => self::UNDEFINED,
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# GPS date
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'GPSDateStamp' => self::ASCII,
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# GPS differential correction
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'GPSDifferential' => self::SHORT,
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],
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];
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$this->file = $file;
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$this->basename = wfBaseName( $this->file );
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if ( $byteOrder === 'BE' || $byteOrder === 'LE' ) {
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$this->byteOrder = $byteOrder;
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} else {
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// Only give a warning for b/c, since originally we didn't
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// require this. The number of things affected by this is
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// rather small.
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wfWarn( 'Exif class did not have byte order specified. ' .
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'Some properties may be decoded incorrectly.' );
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// BE seems about twice as popular as LE in jpg's.
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$this->byteOrder = 'BE';
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}
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$this->debugFile( __FUNCTION__, true );
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if ( function_exists( 'exif_read_data' ) ) {
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AtEase::suppressWarnings();
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$data = exif_read_data( $this->file, '', true );
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AtEase::restoreWarnings();
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} else {
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throw new ConfigException( "Internal error: exif_read_data not present. " .
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"\$wgShowEXIF may be incorrectly set or not checked by an extension." );
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}
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/**
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* exif_read_data() will return false on invalid input, such as
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* when somebody uploads a file called something.jpeg
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* containing random gibberish.
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*/
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$this->mRawExifData = $data ?: [];
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$this->makeFilteredData();
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$this->collapseData();
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$this->debugFile( __FUNCTION__, false );
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}
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/**
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* Make $this->mFilteredExifData
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*/
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private function makeFilteredData() {
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$this->mFilteredExifData = [];
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foreach ( $this->mRawExifData as $section => $data ) {
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if ( !array_key_exists( $section, $this->mExifTags ) ) {
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$this->debug( $section, __FUNCTION__, "'$section' is not a valid Exif section" );
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continue;
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}
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foreach ( $data as $tag => $value ) {
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if ( !array_key_exists( $tag, $this->mExifTags[$section] ) ) {
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$this->debug( $tag, __FUNCTION__, "'$tag' is not a valid tag in '$section'" );
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continue;
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}
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if ( $this->validate( $section, $tag, $value ) ) {
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// This is ok, as the tags in the different sections do not conflict.
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// except in computed and thumbnail section, which we don't use.
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$this->mFilteredExifData[$tag] = $value;
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} else {
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$this->debug( $value, __FUNCTION__, "'$tag' contained invalid data" );
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}
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}
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}
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}
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/**
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* Collapse some fields together.
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* This converts some fields from exif form, to a more friendly form.
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* For example GPS latitude to a single number.
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*
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* The rationale behind this is that we're storing data, not presenting to the user
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* For example a longitude is a single number describing how far away you are from
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* the prime meridian. Well it might be nice to split it up into minutes and seconds
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* for the user, it doesn't really make sense to split a single number into 4 parts
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* for storage. (degrees, minutes, second, direction vs single floating point number).
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*
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* Other things this might do (not really sure if they make sense or not):
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* Dates -> mediawiki date format.
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* convert values that can be in different units to be in one standardized unit.
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*
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* As an alternative approach, some of this could be done in the validate phase
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* if we make up our own types like Exif::DATE.
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*/
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private function collapseData() {
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$this->exifGPStoNumber( 'GPSLatitude' );
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$this->exifGPStoNumber( 'GPSDestLatitude' );
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$this->exifGPStoNumber( 'GPSLongitude' );
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$this->exifGPStoNumber( 'GPSDestLongitude' );
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|
|
if ( isset( $this->mFilteredExifData['GPSAltitude'] ) ) {
|
|
// 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.
|
|
[ $num, $denom ] = explode( '/', $this->mFilteredExifData['GPSAltitude'], 2 );
|
|
$this->mFilteredExifData['GPSAltitude'] = (int)$num / (int)$denom;
|
|
|
|
if ( isset( $this->mFilteredExifData['GPSAltitudeRef'] ) ) {
|
|
switch ( $this->mFilteredExifData['GPSAltitudeRef'] ) {
|
|
case "\0":
|
|
// Above sea level
|
|
break;
|
|
case "\1":
|
|
// Below sea level
|
|
$this->mFilteredExifData['GPSAltitude'] *= -1;
|
|
break;
|
|
default:
|
|
// Invalid
|
|
unset( $this->mFilteredExifData['GPSAltitude'] );
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
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 ) );
|
|
}
|
|
// this is for formatting later.
|
|
$ccVals['_type'] = 'ol';
|
|
$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 "JIS\x00\x00\x00\x00\x00":
|
|
$charset = "Shift-JIS";
|
|
break;
|
|
case "UNICODE\x00":
|
|
$charset = "UTF-16" . $this->byteOrder;
|
|
break;
|
|
default:
|
|
// ascii or undefined.
|
|
$charset = "";
|
|
break;
|
|
}
|
|
if ( $charset ) {
|
|
AtEase::suppressWarnings();
|
|
$val = iconv( $charset, 'UTF-8//IGNORE', $val );
|
|
AtEase::restoreWarnings();
|
|
} else {
|
|
// if valid utf-8, assume that, otherwise assume windows-1252
|
|
$valCopy = $val;
|
|
UtfNormal\Validator::quickIsNFCVerify( $valCopy );
|
|
if ( $valCopy !== $val ) {
|
|
AtEase::suppressWarnings();
|
|
$val = iconv( 'Windows-1252', 'UTF-8//IGNORE', $val );
|
|
AtEase::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 degrees 20`40`` S -> -10.34444
|
|
* @param string $prop A GPS coordinate exif tag name (like GPSLongitude)
|
|
*/
|
|
private function exifGPStoNumber( $prop ) {
|
|
$loc = $this->mFilteredExifData[$prop] ?? null;
|
|
$dir = $this->mFilteredExifData[$prop . 'Ref'] ?? null;
|
|
$res = false;
|
|
|
|
if ( $loc !== null && in_array( $dir, [ 'N', 'S', 'E', 'W' ] ) ) {
|
|
if ( is_array( $loc ) && count( $loc ) === 3 ) {
|
|
[ $num, $denom ] = explode( '/', $loc[0], 2 );
|
|
$res = (int)$num / (int)$denom;
|
|
[ $num, $denom ] = explode( '/', $loc[1], 2 );
|
|
$res += ( (int)$num / (int)$denom ) * ( 1 / 60 );
|
|
[ $num, $denom ] = explode( '/', $loc[2], 2 );
|
|
$res += ( (int)$num / (int)$denom ) * ( 1 / 3600 );
|
|
} elseif ( is_string( $loc ) ) {
|
|
// This is non-standard, but occurs in the wild (T386208)
|
|
[ $num, $denom ] = explode( '/', $loc, 2 );
|
|
$res = (int)$num / (int)$denom;
|
|
}
|
|
|
|
if ( $res && ( $dir === 'S' || $dir === 'W' ) ) {
|
|
// make negative
|
|
$res *= -1;
|
|
}
|
|
}
|
|
|
|
// update the exif records.
|
|
|
|
// using !== as $res could potentially be 0
|
|
if ( $res !== false ) {
|
|
$this->mFilteredExifData[$prop] = $res;
|
|
} else {
|
|
// if invalid
|
|
unset( $this->mFilteredExifData[$prop] );
|
|
}
|
|
unset( $this->mFilteredExifData[$prop . 'Ref'] );
|
|
}
|
|
|
|
/**
|
|
* Get $this->mRawExifData
|
|
* @return array
|
|
*/
|
|
public function getData() {
|
|
return $this->mRawExifData;
|
|
}
|
|
|
|
/**
|
|
* Get $this->mFilteredExifData
|
|
* @return array
|
|
*/
|
|
public 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;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
$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( $in, __FUNCTION__, 'found a character that is not allowed' );
|
|
|
|
return false;
|
|
}
|
|
|
|
if ( preg_match( '/^\s*$/', $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;
|
|
}
|
|
|
|
$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 <= 4_294_967_296 ) {
|
|
$this->debug( $in, __FUNCTION__, true );
|
|
|
|
return true;
|
|
}
|
|
|
|
$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] );
|
|
}
|
|
|
|
$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 ( $this->isLong( abs( (float)$in ) ) ) {
|
|
$this->debug( $in, __FUNCTION__, true );
|
|
|
|
return true;
|
|
}
|
|
|
|
$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] );
|
|
}
|
|
|
|
$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 ): bool {
|
|
$debug = "tag is '$tag'";
|
|
$etype = $this->mExifTags[$section][$tag];
|
|
$ecount = 1;
|
|
if ( is_array( $etype ) ) {
|
|
[ $etype, $ecount ] = $etype;
|
|
if ( $recursive ) {
|
|
// checking individual elements
|
|
$ecount = 1;
|
|
}
|
|
}
|
|
|
|
$count = 1;
|
|
if ( is_array( $val ) ) {
|
|
$count = count( $val );
|
|
if ( $ecount !== $count ) {
|
|
$this->debug( $val, __FUNCTION__, "Expected $ecount elements for $tag but got $count" );
|
|
return false;
|
|
}
|
|
}
|
|
// If there are multiple values, recursively validate each of them.
|
|
if ( $count > 1 ) {
|
|
foreach ( $val as $v ) {
|
|
if ( !$this->validate( $section, $tag, $v, true ) ) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// NULL values are considered valid. T315202.
|
|
if ( $val === null ) {
|
|
return true;
|
|
}
|
|
|
|
// Does not work if not typecast
|
|
switch ( (string)$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 = get_debug_type( $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}'" );
|
|
}
|
|
}
|
|
}
|