ftp_pure::_data_prepare

	function _data_prepare($mode=FTP_ASCII) {
		if(!$this->_settype($mode)) return FALSE;
		if($this->_passive) {
			if(!$this->_exec("PASV", "pasv")) {
				$this->_data_close();
				return FALSE;
			}
			if(!$this->_checkCode()) {
				$this->_data_close();
				return FALSE;
			}
			$ip_port = explode(",", preg_replace("/^.+ \\(?([0-9]{1,3},[0-9]{1,3},[0-9]{1,3},[0-9]{1,3},[0-9]+,[0-9]+)\\)?.*$/s", "\\1", $this->_message));
			$this->_datahost=$ip_port[0].".".$ip_port[1].".".$ip_port[2].".".$ip_port[3];
            $this->_dataport=(((int)$ip_port[4])<<8) + ((int)$ip_port[5]);
			$this->SendMSG("Connecting to ".$this->_datahost.":".$this->_dataport);
			$this->_ftp_data_sock=@fsockopen($this->_datahost, $this->_dataport, $errno, $errstr, $this->_timeout);
			if(!$this->_ftp_data_sock) {
				$this->PushError("_data_prepare","fsockopen fails", $errstr." (".$errno.")");
				$this->_data_close();
				return FALSE;
			}
			else $this->_ftp_data_sock;
		} else {
			$this->SendMSG("Only passive connections available!");
			return FALSE;
		}
		return TRUE;
	}