2008-11-27 16:40:45 +00:00
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/* tnef.c
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*
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* Transport-Neutral Encapsulation Format (TNEF) file reading
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*
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* $Id$
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*
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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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2012-06-28 22:56:06 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2008-11-27 16:40:45 +00:00
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*/
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#include "config.h"
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#include <errno.h>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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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 "tnef.h"
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static gboolean tnef_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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{
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2012-05-04 16:56:18 +00:00
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gint64 offset;
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2008-11-27 16:40:45 +00:00
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guint8 *buf;
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gint64 file_size;
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int packet_size;
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*err = 0;
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2012-05-04 16:56:18 +00:00
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offset = file_tell(wth->fh);
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2008-11-27 16:40:45 +00:00
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/* there is only ever one packet */
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2012-05-04 16:56:18 +00:00
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if (offset)
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2008-11-27 16:40:45 +00:00
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return FALSE;
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2012-05-04 16:56:18 +00:00
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*data_offset = offset;
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2008-11-27 16:40:45 +00:00
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if ((file_size = wtap_file_size(wth, err)) == -1)
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return FALSE;
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if (file_size > WTAP_MAX_PACKET_SIZE) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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2011-12-13 09:53:50 +00:00
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*err = WTAP_ERR_BAD_FILE;
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2008-11-27 16:40:45 +00:00
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*err_info = g_strdup_printf("tnef: File has %" G_GINT64_MODIFIER "d-byte packet, bigger than maximum of %u",
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file_size, WTAP_MAX_PACKET_SIZE);
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return FALSE;
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}
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packet_size = (int)file_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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2011-04-21 09:41:52 +00:00
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wtap_file_read_expected_bytes(buf, packet_size, wth->fh, err, err_info);
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2008-11-27 16:40:45 +00:00
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2012-02-25 23:24:34 +00:00
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wth->phdr.presence_flags = 0; /* no time stamp, no "real length" */
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2008-11-27 16:40:45 +00:00
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wth->phdr.caplen = packet_size;
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wth->phdr.len = packet_size;
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2012-02-25 23:24:34 +00:00
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wth->phdr.ts.secs = 0;
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2008-11-27 16:40:45 +00:00
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wth->phdr.ts.nsecs = 0;
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return TRUE;
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}
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static gboolean tnef_seek_read(wtap *wth, gint64 seek_off,
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2012-10-16 21:50:57 +00:00
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struct wtap_pkthdr *phdr _U_,
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2011-04-21 09:41:52 +00:00
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guint8 *pd, int length, int *err, gchar **err_info)
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2008-11-27 16:40:45 +00:00
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{
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int packet_size = length;
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/* there is only one packet */
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if(seek_off > 0) {
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*err = 0;
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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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return FALSE;
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2011-04-21 09:41:52 +00:00
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wtap_file_read_expected_bytes(pd, packet_size, wth->random_fh, err, err_info);
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2008-11-27 16:40:45 +00:00
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return TRUE;
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}
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2011-04-21 09:41:52 +00:00
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int tnef_open(wtap *wth, int *err, gchar **err_info)
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2008-11-27 16:40:45 +00:00
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{
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int bytes_read;
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guint32 magic;
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2011-04-06 06:51:19 +00:00
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bytes_read = file_read(&magic, sizeof magic, wth->fh);
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2008-11-27 16:40:45 +00:00
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if (bytes_read != sizeof magic) {
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2011-04-21 09:41:52 +00:00
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*err = file_error(wth->fh, err_info);
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2008-11-27 16:40:45 +00:00
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return (*err != 0) ? -1 : 0;
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}
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if (htolel(magic) != TNEF_SIGNATURE)
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/* Not a tnef file */
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return 0;
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/* seek back to the start of the file */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return -1;
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wth->file_type = WTAP_FILE_TNEF;
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wth->file_encap = WTAP_ENCAP_TNEF;
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wth->snapshot_length = 0;
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wth->subtype_read = tnef_read;
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wth->subtype_seek_read = tnef_seek_read;
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wth->tsprecision = WTAP_FILE_TSPREC_SEC;
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return 1;
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}
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