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<?php
/**
* Handler for bitmap images with exif metadata.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Media
*/
/**
* Stuff specific to JPEG and (built-in) TIFF handler.
* All metadata related, since both JPEG and TIFF support Exif.
*
* @ingroup Media
*/
class ExifBitmapHandler extends BitmapHandler {
const BROKEN_FILE = '-1'; // error extracting metadata
const OLD_BROKEN_FILE = '0'; // outdated error extracting metadata.
function convertMetadataVersion( $metadata, $version = 1 ) {
// basically flattens arrays.
$version = explode( ';', $version, 2 );
$version = intval( $version[0] );
if ( $version < 1 || $version >= 2 ) {
return $metadata;
}
$avoidHtml = true;
if ( !is_array( $metadata ) ) {
$metadata = unserialize( $metadata );
}
if ( !isset( $metadata['MEDIAWIKI_EXIF_VERSION'] ) || $metadata['MEDIAWIKI_EXIF_VERSION'] != 2 ) {
return $metadata;
}
// Treat Software as a special case because in can contain
// an array of (SoftwareName, Version).
if (isset( $metadata['Software'] )
&& is_array( $metadata['Software'] )
&& is_array( $metadata['Software'][0])
&& isset( $metadata['Software'][0][0] )
&& isset( $metadata['Software'][0][1])
) {
$metadata['Software'] = $metadata['Software'][0][0] . ' (Version '
. $metadata['Software'][0][1] . ')';
}
// ContactInfo also has to be dealt with specially
if ( isset( $metadata['Contact'] ) ) {
$metadata['Contact'] =
FormatMetadata::collapseContactInfo(
$metadata['Contact'] );
}
foreach ( $metadata as &$val ) {
if ( is_array( $val ) ) {
$val = FormatMetadata::flattenArray( $val, 'ul', $avoidHtml );
}
}
$metadata['MEDIAWIKI_EXIF_VERSION'] = 1;
return $metadata;
}
function isMetadataValid( $image, $metadata ) {
global $wgShowEXIF;
if ( !$wgShowEXIF ) {
# Metadata disabled and so an empty field is expected
return self::METADATA_GOOD;
}
if ( $metadata === self::OLD_BROKEN_FILE ) {
# Old special value indicating that there is no EXIF data in the file.
# or that there was an error well extracting the metadata.
wfDebug( __METHOD__ . ": back-compat version\n" );
return self::METADATA_COMPATIBLE;
}
if ( $metadata === self::BROKEN_FILE ) {
return self::METADATA_GOOD;
}
wfSuppressWarnings();
$exif = unserialize( $metadata );
wfRestoreWarnings();
if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) ||
$exif['MEDIAWIKI_EXIF_VERSION'] != Exif::version() )
{
if ( isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) &&
$exif['MEDIAWIKI_EXIF_VERSION'] == 1 )
{
//back-compatible but old
wfDebug( __METHOD__ . ": back-compat version\n" );
return self::METADATA_COMPATIBLE;
}
# Wrong (non-compatible) version
wfDebug( __METHOD__ . ": wrong version\n" );
return self::METADATA_BAD;
}
return self::METADATA_GOOD;
}
/**
* @param $image File
* @return array|bool
*/
function formatMetadata( $image ) {
$metadata = $image->getMetadata();
if ( $metadata === self::OLD_BROKEN_FILE ||
$metadata === self::BROKEN_FILE ||
$this->isMetadataValid( $image, $metadata ) === self::METADATA_BAD )
{
// So we don't try and display metadata from PagedTiffHandler
// for example when using InstantCommons.
return false;
}
$exif = unserialize( $metadata );
if ( !$exif ) {
return false;
}
unset( $exif['MEDIAWIKI_EXIF_VERSION'] );
if ( count( $exif ) == 0 ) {
return false;
}
return $this->formatMetadataHelper( $exif );
}
function getMetadataType( $image ) {
return 'exif';
}
/**
* Wrapper for base classes ImageHandler::getImageSize() that checks for
* rotation reported from metadata and swaps the sizes to match.
*
* @param File $image
* @param string $path
* @return array
*/
function getImageSize( $image, $path ) {
global $wgEnableAutoRotation;
$gis = parent::getImageSize( $image, $path );
// Don't just call $image->getMetadata(); FSFile::getPropsFromPath() calls us with a bogus object.
// This may mean we read EXIF data twice on initial upload.
if ( $wgEnableAutoRotation ) {
$meta = $this->getMetadata( $image, $path );
$rotation = $this->getRotationForExif( $meta );
} else {
$rotation = 0;
}
if ( $rotation == 90 || $rotation == 270 ) {
$width = $gis[0];
$gis[0] = $gis[1];
$gis[1] = $width;
}
return $gis;
}
/**
* On supporting image formats, try to read out the low-level orientation
* of the file and return the angle that the file needs to be rotated to
* be viewed.
*
* This information is only useful when manipulating the original file;
* the width and height we normally work with is logical, and will match
* any produced output views.
*
* @param $file File
* @return int 0, 90, 180 or 270
*/
public function getRotation( $file ) {
global $wgEnableAutoRotation;
if ( !$wgEnableAutoRotation ) {
return 0;
}
$data = $file->getMetadata();
return $this->getRotationForExif( $data );
}
/**
* Given a chunk of serialized Exif metadata, return the orientation as
* degrees of rotation.
*
* @param string $data
* @return int 0, 90, 180 or 270
* @todo FIXME orientation can include flipping as well; see if this is an
* issue!
*/
protected function getRotationForExif( $data ) {
if ( !$data ) {
return 0;
}
wfSuppressWarnings();
$data = unserialize( $data );
wfRestoreWarnings();
if ( isset( $data['Orientation'] ) ) {
# See http://sylvana.net/jpegcrop/exif_orientation.html
switch ( $data['Orientation'] ) {
case 8:
return 90;
case 3:
return 180;
case 6:
return 270;
default:
return 0;
}
}
return 0;
}
}
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