who can tell me why there is a "plus 5" ( s = iso_init(length + 5); )statement in mcs_send_connect_initial function

Hi,rdesktop-devel,

	who can tell me why there is a "plus 5" ( s = iso_init(length + 5);)statement in mcs_send_connect_initial function  
/* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */
static void
mcs_send_connect_initial(STREAM mcs_data)
{
	int datalen = mcs_data->end - mcs_data->data;
	int length = 7 + 3 * 34 + 4 + datalen;
	STREAM s;

	s = iso_init(length + 5);         //why we add 5 to iso_init parameter??I think it doesnot need!
……
』


Best Regards,	

phil song
[email protected]
2010-02-20
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