xmlrpc_message_parse() in xmlrpc.inc is not safe for big XML-RPC responses

The line

$xmlrpc_message->message = preg_replace('/<\?xml(.*)?\?'.'>/', '', $xmlrpc_message->message);

in xmlrpc_message_parse() is not save for big XML-PRC responses (>100.000 chars). preg_replace() has an implicit limit (see http://de3.php.net/preg_replace#84285) and returns NULL for the big XML-RPC responses.

I propose to use a less elegant, but working(!) version:

$pos1 = strpos($xmlrpc_message->message, '<?xml');
if ($pos1 !== FALSE) {
$pos2 = strpos($xmlrpc_message->message, '?>', $pos1);
if ($pos1 !== FALSE) {
$xmlrpc_message->message = substr($xmlrpc_message->message, $pos2+2);
}
}

Since the issue makes xmlrpc() not working for all kind of responses, I mark this issue as critical.