    public function buildFile($interchange, $file) {
        $parser = new HTMLPurifier_StringHashParser();
        $this->build(
            $interchange,
            new HTMLPurifier_StringHash( $parser->parseFile($file) )
        );
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.