            [$result, $message] = $rule($remoteFile);
            if ($result !== true) {
                Helpers::record_warnings(E_USER_WARNING, "Error loading $remoteFile: $message", __FILE__, __LINE__);
            }
        }

        list($remoteFileContent, $http_response_header) = @Helpers::getFileContent($remoteFile, $context);
        if ($remoteFileContent === null) {
            return false;
        }

        $localTempFile = @tempnam($this->options->get("tempDir"), "dompdf-font-");
        file_put_contents($localTempFile, $remoteFileContent);

        $font = Font::load($localTempFile);

        if (!$font) {
            unlink($localTempFile);
            return false;
        }

        $font->parse();
        $font->saveAdobeFontMetrics("$localFilePath.ufm");
        $font->close();

        unlink($localTempFile);

        if ( !file_exists("$localFilePath.ufm") ) {
            return false;
        }

        $fontExtension = ".ttf";
        switch ($font->getFontType()) {
            case "TrueType":
            default:
                $fontExtension = ".ttf";
                break;
        }

        // Save the changes
        file_put_contents($localFilePath.$fontExtension, $remoteFileContent);

        if ( !file_exists($localFilePath.$fontExtension) ) {
            unlink("$localFilePath.ufm");
            return false;
        }

        $this->setFontFamily($fontname, $entry);

        return true;
    }
The software allows user input to control or influence paths or file names that are used in filesystem operations.