Jpeg.php

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<?php
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;
        }
    }

    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'] );
            wfDebug( __METHOD__ . ": running jpgtran: $cmd\n" );
            wfProfileIn( 'jpegtran' );
            $retval = 0;
            $err = wfShellExecWithStderr( $cmd, $retval );
            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 );
        }
    }
}