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/*
* $smu-mark$
* $name: relid.c$
* $author: Salvatore Sanfilippo <antirez@invece.org>$
* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
* $license: This software is under GPL version 2 of license$
* $date: Fri Nov 5 11:55:49 MET 1999$
* $rev: 3$
*/
/* FIXME: maybe it's better to avoid division per seq_diff and
at least add an option to switch on/off this feature */
/* $Id: relid.c,v 1.2 2003/09/01 00:22:06 antirez Exp $ */
#include "hping2.h"
#include "globals.h"
int relativize_id(int seqnum, int *ip_id)
{
int seq_diff, backup_id;
static int last_seq = 0, last_id = -1;
backup_id = *ip_id;
if (last_id == -1) {
last_id = *ip_id;
last_seq = seqnum;
}
else
{
if ( (seq_diff=(seqnum-last_seq)) > 0)
{
if (last_id > *ip_id) /* rew */
*ip_id = ((65535-last_id)
+ *ip_id)/seq_diff;
else
*ip_id = (*ip_id-last_id)
/seq_diff;
last_id = backup_id;
last_seq = seqnum;
return TRUE;
} else {
out_of_sequence_pkt++;
}
}
return FALSE;
}
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