/**
* Clean up filename.
*
* @param string Initial filename
* @return string Normalized filename
*/
private function cleanFilename($name) {
$name = Strings::replaceSpecialChars($name);
// first char is dot or if all chars were stripped out by replaceSpecialChars()
if ($name[0] == '.' || strlen($name) == 0) {
$name = "upload".$name;
}
return $name;
}