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<?php
/**
* Handler for JPEG images.
*
* 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
*/
/**
* JPEG specific handler.
* Inherits most stuff from BitmapHandler, just here to do the metadata handler differently.
*
* Metadata stuff common to Jpeg and built-in Tiff (not PagedTiffHandler) is
* in ExifBitmapHandler.
*
* @ingroup Media
*/
class JpegHandler extends ExifBitmapHandler {
function getMetadata ( $image, $filename ) {
try {
$meta = BitmapMetadataHandler::Jpeg( $filename );
if ( !is_array( $meta ) ) {
// This should never happen, but doesn't hurt to be paranoid.
throw new MWException( 'Metadata array is not an array' );
}
$meta['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
return serialize( $meta );
}
catch ( MWException $e ) {
// BitmapMetadataHandler throws an exception in certain exceptional cases like if file does not exist.
wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
/* This used to use 0 (ExifBitmapHandler::OLD_BROKEN_FILE) for the cases
* * No metadata in the file
* * Something is broken in the file.
* However, if the metadata support gets expanded then you can't tell if the 0 is from
* a broken file, or just no props found. A broken file is likely to stay broken, but
* a file which had no props could have props once the metadata support is improved.
* Thus switch to using -1 to denote only a broken file, and use an array with only
* MEDIAWIKI_EXIF_VERSION to denote no props.
*/
return ExifBitmapHandler::BROKEN_FILE;
}
}
/**
* @param $file File
* @param array $params Rotate parameters.
* 'rotation' clockwise rotation in degrees, allowed are multiples of 90
* @since 1.21
* @return bool
*/
public function rotate( $file, $params ) {
global $wgJpegTran;
$rotation = ( $params[ 'rotation' ] + $this->getRotation( $file ) ) % 360;
if( $wgJpegTran && is_file( $wgJpegTran ) ){
$cmd = wfEscapeShellArg( $wgJpegTran ) .
" -rotate " . wfEscapeShellArg( $rotation ) .
" -outfile " . wfEscapeShellArg( $params[ 'dstPath' ] ) .
" " . wfEscapeShellArg( $params[ 'srcPath' ] ) . " 2>&1";
wfDebug( __METHOD__ . ": running jpgtran: $cmd\n" );
wfProfileIn( 'jpegtran' );
$retval = 0;
$err = wfShellExec( $cmd, $retval, $env );
wfProfileOut( 'jpegtran' );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );
return new MediaTransformError( 'thumbnail_error', 0, 0, $err );
}
return false;
} else {
return parent::rotate( $file, $params );
}
}
}
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