* @author Brion Vibber * @copyright Copyright © 2010-2010 Brion Vibber, Derk-Jan Hartman * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License */ class SVGMetadataExtractor { static function getMetadata( $filename ) { $svg = new SVGReader( $filename ); return $svg->getMetadata(); } } class SVGReader { const DEFAULT_WIDTH = 512; const DEFAULT_HEIGHT = 512; const NS_SVG = 'http://www.w3.org/2000/svg'; private $reader = null; private $mDebug = false; private $metadata = Array(); /** * Constructor * * Creates an SVGReader drawing from the source provided * @param $source String: URI from which to read */ function __construct( $source ) { global $wgSVGMetadataCutoff; $this->reader = new XMLReader(); // Don't use $file->getSize() since file object passed to SVGHandler::getMetadata is bogus. $size = filesize( $source ); if ( $size === false ) { throw new MWException( "Error getting filesize of SVG." ); } if ( $size > $wgSVGMetadataCutoff ) { $this->debug( "SVG is $size bytes, which is bigger than $wgSVGMetadataCutoff. Truncating." ); $contents = file_get_contents( $source, false, null, -1, $wgSVGMetadataCutoff ); if ($contents === false) { throw new MWException( 'Error reading SVG file.' ); } $this->reader->XML( $contents, null, LIBXML_NOERROR | LIBXML_NOWARNING ); } else { $this->reader->open( $source, null, LIBXML_NOERROR | LIBXML_NOWARNING ); } // Expand entities, since Adobe Illustrator uses them for xmlns // attributes (bug 31719). Note that libxml2 has some protection // against large recursive entity expansions so this is not as // insecure as it might appear to be. $this->reader->setParserProperty( XMLReader::SUBST_ENTITIES, true ); $this->metadata['width'] = self::DEFAULT_WIDTH; $this->metadata['height'] = self::DEFAULT_HEIGHT; // Because we cut off the end of the svg making an invalid one. Complicated // try catch thing to make sure warnings get restored. Seems like there should // be a better way. wfSuppressWarnings(); try { $this->read(); } catch( Exception $e ) { wfRestoreWarnings(); throw $e; } wfRestoreWarnings(); } /** * @return Array with the known metadata */ public function getMetadata() { return $this->metadata; } /** * Read the SVG */ public function read() { $keepReading = $this->reader->read(); /* Skip until first element */ while( $keepReading && $this->reader->nodeType != XmlReader::ELEMENT ) { $keepReading = $this->reader->read(); } if ( $this->reader->localName != 'svg' || $this->reader->namespaceURI != self::NS_SVG ) { throw new MWException( "Expected