From Weston Schmidt: Add mpeg-ts capture file format support. https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6894

svn path=/trunk/; revision=41286

1 files changed, 174 insertions, 0 deletions

diff --git a/wiretap/mp2t.c b/wiretap/mp2t.c
new file mode 100644
index 0000000000..bcab1a8977
--- /dev/null
+++ b/wiretap/mp2t.c
@@ -0,0 +1,174 @@
+/* mp2t.c
+ *
+ * ISO/IEC 13818-1 MPEG2-TS file format decoder for the Wiretap library.
+ * Written by Weston Schmidt <weston_schmidt@alumni.purdue.edu>
+ * Copyright 2012 Weston Schmidt
+ *
+ * $Id$
+ *
+ * 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 "mp2t.h"
+
+#include "wtap-int.h"
+#include "buffer.h"
+#include "file_wrappers.h"
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#define MP2T_SYNC_BYTE      0x47
+#define MP2T_SIZE           188
+#define MP2T_QAM256_BITRATE 38810700    /* bits per second */
+#define MP2T_QAM64_BITRATE  26970350    /* bits per second */
+
+typedef struct {
+    guint32 offset;
+    struct wtap_nstime now;
+} mp2t_filetype_t;
+
+static gboolean
+mp2t_read_data(guint8 *dest, int length, int *err, gchar **err_info, FILE_T fh)
+{
+    int bytes_read;
+
+    bytes_read = file_read(dest, length, fh);
+    if (MP2T_SIZE != bytes_read) {
+        *err = file_error(fh, err_info);
+        if (*err == 0) {
+            *err = WTAP_ERR_SHORT_READ;
+        }
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static gboolean
+mp2t_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
+{
+    mp2t_filetype_t *mp2t;
+    guint64 tmp;
+
+    mp2t = (mp2t_filetype_t*) wth->priv;
+
+    *data_offset = mp2t->offset;
+    buffer_assure_space(wth->frame_buffer, MP2T_SIZE);
+    if (FALSE == mp2t_read_data(buffer_start_ptr(wth->frame_buffer),
+                                MP2T_SIZE, err, err_info, wth->fh))
+    {
+        return FALSE;
+    }
+
+    mp2t->offset += MP2T_SIZE;
+    wth->phdr.presence_flags = WTAP_HAS_TS;
+
+    /* It would be really cool to be able to configure the bitrate... */
+    tmp = MP2T_SIZE * 8;
+    tmp *= 1000000000;
+    tmp /= MP2T_QAM256_BITRATE;
+
+    wth->phdr.ts.secs = mp2t->now.secs;
+    wth->phdr.ts.nsecs = mp2t->now.nsecs;
+    mp2t->now.nsecs += (guint32)tmp;
+    if (1000000000 <= mp2t->now.nsecs) {
+        mp2t->now.nsecs -= 1000000000;
+        mp2t->now.secs++;
+    }
+    wth->phdr.caplen = MP2T_SIZE;
+    wth->phdr.len = MP2T_SIZE;
+
+    return TRUE;
+}
+
+static gboolean
+mp2t_seek_read(wtap *wth, gint64 seek_off,
+        union wtap_pseudo_header *pseudo_header _U_, guint8 *pd, int length,
+        int *err, gchar **err_info)
+{
+    if (-1 == file_seek(wth->random_fh, seek_off, SEEK_SET, err)) {
+        return FALSE;
+    }
+
+    return mp2t_read_data(pd, length, err, err_info, wth->random_fh);
+}
+
+int
+mp2t_open(wtap *wth, int *err, gchar **err_info)
+{
+    int bytes_read;
+    guint8 buffer[MP2T_SIZE];
+    int i;
+    int first;
+    mp2t_filetype_t *mp2t;
+
+    errno = WTAP_ERR_CANT_READ;
+    bytes_read = file_read(buffer, sizeof(buffer), wth->fh);
+
+    if (sizeof(buffer) != bytes_read) {
+        *err = file_error(wth->fh, err_info);
+        return (*err == 0) ? 0 : -1;
+    }
+
+    first = -1;
+    for (i = 0; i < MP2T_SIZE; i++) {
+        if (MP2T_SYNC_BYTE == buffer[i]) {
+            first = i;
+            break;
+        }
+    }
+
+    if (-1 == first) {
+        return 0;
+    }
+
+    if (-1 == file_seek(wth->fh, first, SEEK_SET, err)) {
+        return -1;
+    }
+
+    wth->file_type = WTAP_FILE_MPEG_2_TS;
+    wth->file_encap = WTAP_ENCAP_MPEG_2_TS;
+    wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
+    wth->subtype_read = mp2t_read;
+    wth->subtype_seek_read = mp2t_seek_read;
+    wth->snapshot_length = 0;
+
+    mp2t = (mp2t_filetype_t*) g_malloc(sizeof(mp2t_filetype_t));
+    if (NULL == mp2t) {
+        return -1;
+    }
+
+    wth->priv = mp2t;
+    mp2t->offset = (guint32) first;
+    mp2t->now.secs = 0;
+    mp2t->now.nsecs = 0;
+
+    return 1;
+}