Building a GList by adding elements to the end with "g_list_append()" is

N^2 in the ultimate size of the list (as "g_list_append()" is linear in
the size of the list, at least when used in the way the GLib
documentation says to use it); instead, maintain our own linked list of
"frame_data" structures for all packets read, including a pointer to the
last element.

"gtk_clist_set_row_data()" is linear in the row number, so if it's used
to attach a pointer to the "frame_data" structure for a packet to the
packet list GtkClist row for each packet, that's also N^2 in the number
of packets in that packet list; instead, store the row number in the
"frame_data" structure, and find the packet for a given row by scanning
the list for it (we were already scanning the list linearly to find that
packet's index in the list of all packets; that's only done when a
packet's selected, so it's not *too* bad, but it might be nice to avoid
having to do that scan).

svn path=/trunk/; revision=457

1 files changed, 5 insertions, 7 deletions

diff --git a/summary.c b/summary.c
index e6d9418408..fd02eb17e1 100644
--- a/summary.c
+++ b/summary.c
@@ -1,7 +1,7 @@
 /* summary.c
  * Routines for capture file summary window
  *
- * $Id: summary.c,v 1.7 1999/08/02 02:04:27 guy Exp $
+ * $Id: summary.c,v 1.8 1999/08/10 04:13:36 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -128,10 +128,10 @@ summary_prep_cb(GtkWidget *w, gpointer d) {
 
  guint32        traffic_bytes, i;
  double         seconds;
- GList          *cur_glist;
+ frame_data    *cur_glist;
 
  /* initialize the tally */
-  first_frame = (frame_data *)(cf.plist->data);
+  first_frame = cf.plist;
   st = (summary_tally *)g_malloc(sizeof(summary_tally));
   st->start_time = secs_usecs(first_frame->abs_secs,first_frame->abs_usecs) 
 ;
@@ -142,12 +142,10 @@ summary_prep_cb(GtkWidget *w, gpointer d) {
   cur_glist = cf.plist;
 
   for (i = 0; i < cf.count; i++){
-    cur_frame = (frame_data *)cur_glist->data;
+    cur_frame = cur_glist;
     tally_frame_data(cur_frame, st);
     cur_glist = cur_glist->next;
-    }
-
-  /*  g_list_foreach(cf.plist_first, (GFunc)tally_frame_data, st); */
+  }
 
   /* traffic_bytes will be computed here */
   traffic_bytes = st->bytes;