forked from osmocom/wireshark
17392a865a
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
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*
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* JPEG/JFIF file format decoder for the Wiretap library.
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* Written by Marton Nemeth <nm127@freemail.hu>
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* Copyright 2009 Marton Nemeth
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*
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* $Id$
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*
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* The JPEG and JFIF specification can be found at:
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* http://www.jpeg.org/public/jfif.pdf
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* http://www.w3.org/Graphics/JPEG/itu-t81.pdf
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*
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* Wiretap Library
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "jpeg_jfif.h"
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static const guchar jpeg_jfif_magic[] = { 0xFF, 0xD8, /* SOF */
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0xFF /* start of the next marker */
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};
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static gboolean
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jpeg_jfif_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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guint8 *buf;
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gint64 file_size;
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int packet_size;
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gint64 capture_size;
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*err = 0;
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/* interpret the file as one packet only */
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if (wth->data_offset)
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return FALSE;
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*data_offset = wth->data_offset;
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if ((file_size = wtap_file_size(wth, err)) == -1)
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return FALSE;
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/* Read maximum possible packet size */
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if (file_size <= WTAP_MAX_PACKET_SIZE) {
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capture_size = file_size;
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} else {
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capture_size = WTAP_MAX_PACKET_SIZE;
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}
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packet_size = (int)capture_size;
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buffer_assure_space(wth->frame_buffer, packet_size);
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buf = buffer_start_ptr(wth->frame_buffer);
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wtap_file_read_expected_bytes(buf, packet_size, wth->fh, err);
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wth->data_offset += packet_size;
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wth->phdr.caplen = packet_size;
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wth->phdr.len = (int)file_size;
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wth->phdr.ts.secs = 0;
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wth->phdr.ts.nsecs = 0;
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*err_info = NULL;
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return TRUE;
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}
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static gboolean
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jpeg_jfif_seek_read(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header _U_, guchar *pd, int length,
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int *err, gchar **err_info)
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{
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int packet_size = length;
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/* interpret the file as one packet only */
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if (0 < seek_off) {
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*err = 0;
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*err_info = NULL;
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return FALSE;
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}
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1) {
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*err_info = NULL;
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return FALSE;
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}
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wtap_file_read_expected_bytes(pd, packet_size, wth->random_fh, err);
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*err = 0;
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*err_info = NULL;
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return TRUE;
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}
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int
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jpeg_jfif_open(wtap *wth, int *err, gchar **err_info)
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{
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int bytes_read;
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char magic_buf[3];
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int ret = 0;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(magic_buf, 1, sizeof(magic_buf), wth->fh);
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if (bytes_read != (int) sizeof(magic_buf)) {
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*err = file_error(wth->fh);
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if (*err != 0) {
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*err_info = NULL;
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ret = -1;
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}
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} else {
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if (memcmp(magic_buf, jpeg_jfif_magic, sizeof(magic_buf)) == 0) {
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ret = 1;
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wth->file_type = WTAP_FILE_JPEG_JFIF;
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wth->file_encap = WTAP_ENCAP_JPEG_JFIF;
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wth->tsprecision = WTAP_FILE_TSPREC_SEC;
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wth->subtype_read = jpeg_jfif_read;
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wth->subtype_seek_read = jpeg_jfif_seek_read;
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wth->snapshot_length = 0;
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}
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}
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/* Seek to the start of the file */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
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*err = -1;
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*err_info = NULL;
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ret = -1;
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}
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return ret;
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}
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