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/* cfile.c
* capture_file GUI-independent manipulation
* Vassilii Khachaturov <vassilii@tarunz.org>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include "cfile.h"
void
cap_file_init(capture_file *cf)
{
/* Initialize the capture file struct */
cf->plist_start = NULL;
cf->plist_end = NULL;
cf->wth = NULL;
cf->filename = NULL;
cf->source = NULL;
cf->user_saved = FALSE;
cf->is_tempfile = FALSE;
cf->rfcode = NULL;
cf->dfilter = NULL;
cf->has_snap = FALSE;
cf->snap = WTAP_MAX_PACKET_SIZE;
cf->count = 0;
cf->last_found_num = 0;
cf->last_found_fd = NULL;
cf->redissecting = FALSE;
}
void
cap_file_add_fdata(capture_file *cf, frame_data *fdata)
{
frame_data *plist_end = cf->plist_end;
fdata->prev = plist_end;
if (plist_end != NULL)
plist_end->next = fdata;
else
cf->plist_start = fdata;
cf->plist_end = fdata;
}
/*
* Find the frame_data for the specified frame number.
* Do some caching to make this work reasonably fast for
* forward and backward sequential passes through the packets.
*/
frame_data *
cap_file_find_fdata(capture_file *cf, guint32 num)
{
frame_data *fdata;
if (num == 0) {
/* There is no frame number 0 */
return NULL;
}
/*
* Did we remember a frame number from a sequential pass through
* the frames?
*/
if (cf->last_found_num != 0) {
/*
* Yes. Is this that frame?
*/
if (num == cf->last_found_num) {
/* Yes - return it. */
return cf->last_found_fd;
}
/*
* No. Is it the frame just after that frame?
*/
if (num == cf->last_found_num + 1) {
/*
* Yes - if there is such a frame, remember it and return it.
*/
fdata = cf->last_found_fd->next;
if (fdata != NULL) {
cf->last_found_num = num;
cf->last_found_fd = fdata;
}
return fdata; /* could be null, if there is no such frame */
}
/*
* No. Is it the frame just before that frame?
*/
if (num == cf->last_found_num - 1) {
/*
* Yes - if there is such a frame, remember it and return it.
*/
fdata = cf->last_found_fd->prev;
if (fdata != NULL) {
cf->last_found_num = num;
cf->last_found_fd = fdata;
}
return fdata; /* could be null, if there is no such frame */
}
}
for (fdata = cf->plist_start; fdata != NULL && fdata->num < num;
fdata = fdata->next)
;
if (fdata != NULL) {
cf->last_found_num = num;
cf->last_found_fd = fdata;
}
return fdata;
}
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