![Guy Harris](/assets/img/avatar_default.png)
wtap-int.h, and change the unions of pointers to those private data structures into just void *'s. Have the generic wtap close routine free up the private data, rather than the type-specific close routine, just as the wtap_dumper close routine does for its private data. Get rid of close routines that don't do anything any more. svn path=/trunk/; revision=32015
163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/* jpeg_jfif.c
|
|
*
|
|
* JPEG/JFIF file format decoder for the Wiretap library.
|
|
* Written by Marton Nemeth <nm127@freemail.hu>
|
|
* Copyright 2009 Marton Nemeth
|
|
*
|
|
* $Id$
|
|
*
|
|
* The JPEG and JFIF specification can be found at:
|
|
* http://www.jpeg.org/public/jfif.pdf
|
|
* http://www.w3.org/Graphics/JPEG/itu-t81.pdf
|
|
*
|
|
* Wiretap Library
|
|
* 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
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
|
|
#include "wtap-int.h"
|
|
#include "file_wrappers.h"
|
|
#include "buffer.h"
|
|
#include "jpeg_jfif.h"
|
|
|
|
static const guchar jpeg_jfif_magic[] = { 0xFF, 0xD8, /* SOF */
|
|
0xFF /* start of the next marker */
|
|
};
|
|
|
|
static gboolean
|
|
jpeg_jfif_read(wtap *wth, int *err, gchar **err_info,
|
|
gint64 *data_offset)
|
|
{
|
|
guint8 *buf;
|
|
gint64 file_size;
|
|
int packet_size;
|
|
gint64 capture_size;
|
|
|
|
*err = 0;
|
|
|
|
/* interpret the file as one packet only */
|
|
if (wth->data_offset)
|
|
return FALSE;
|
|
|
|
*data_offset = wth->data_offset;
|
|
|
|
if ((file_size = wtap_file_size(wth, err)) == -1)
|
|
return FALSE;
|
|
|
|
/* Read maximum possible packet size */
|
|
if (file_size <= WTAP_MAX_PACKET_SIZE) {
|
|
capture_size = file_size;
|
|
} else {
|
|
capture_size = WTAP_MAX_PACKET_SIZE;
|
|
}
|
|
packet_size = (int)capture_size;
|
|
|
|
buffer_assure_space(wth->frame_buffer, packet_size);
|
|
buf = buffer_start_ptr(wth->frame_buffer);
|
|
|
|
wtap_file_read_expected_bytes(buf, packet_size, wth->fh, err);
|
|
|
|
wth->data_offset += packet_size;
|
|
|
|
wth->phdr.caplen = packet_size;
|
|
wth->phdr.len = (int)file_size;
|
|
|
|
wth->phdr.ts.secs = 0;
|
|
wth->phdr.ts.nsecs = 0;
|
|
|
|
*err_info = NULL;
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
jpeg_jfif_seek_read(wtap *wth, gint64 seek_off,
|
|
union wtap_pseudo_header *pseudo_header _U_, guchar *pd, int length,
|
|
int *err, gchar **err_info)
|
|
{
|
|
int packet_size = length;
|
|
|
|
/* interpret the file as one packet only */
|
|
if (0 < seek_off) {
|
|
*err = 0;
|
|
*err_info = NULL;
|
|
return FALSE;
|
|
}
|
|
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1) {
|
|
*err_info = NULL;
|
|
return FALSE;
|
|
}
|
|
|
|
wtap_file_read_expected_bytes(pd, packet_size, wth->random_fh, err);
|
|
|
|
*err = 0;
|
|
*err_info = NULL;
|
|
return TRUE;
|
|
}
|
|
|
|
int
|
|
jpeg_jfif_open(wtap *wth, int *err, gchar **err_info)
|
|
{
|
|
int bytes_read;
|
|
char magic_buf[3];
|
|
int ret = 0;
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
bytes_read = file_read(magic_buf, 1, sizeof(magic_buf), wth->fh);
|
|
if (bytes_read != (int) sizeof(magic_buf)) {
|
|
*err = file_error(wth->fh);
|
|
if (*err != 0) {
|
|
*err_info = NULL;
|
|
ret = -1;
|
|
}
|
|
} else {
|
|
if (memcmp(magic_buf, jpeg_jfif_magic, sizeof(magic_buf)) == 0) {
|
|
ret = 1;
|
|
|
|
wth->file_type = WTAP_FILE_JPEG_JFIF;
|
|
wth->file_encap = WTAP_ENCAP_JPEG_JFIF;
|
|
wth->tsprecision = WTAP_FILE_TSPREC_SEC;
|
|
wth->subtype_read = jpeg_jfif_read;
|
|
wth->subtype_seek_read = jpeg_jfif_seek_read;
|
|
wth->snapshot_length = 0;
|
|
}
|
|
}
|
|
|
|
/* Seek to the start of the file */
|
|
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
|
|
*err = -1;
|
|
*err_info = NULL;
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|