1 files changed, 103 insertions, 0 deletions
diff --git a/ui/file_dialog.c b/ui/file_dialog.c
new file mode 100644
index 00000000..91eea5ad
--- /dev/null
+++ b/ui/file_dialog.c
@@ -0,0 +1,103 @@
+/* file_dialog.c
+ * Common file dialog routines
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 2006 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <time.h>
+
+#include <glib.h>
+
+#include <wsutil/nstime.h>
+
+#include <wiretap/wtap.h>
+
+#include <epan/prefs.h>
+
+#include "ui/file_dialog.h"
+
+ws_file_preview_stats_status
+get_stats_for_preview(wtap *wth, ws_file_preview_stats *stats,
+                      int *err, gchar **err_info)
+{
+    gint64       data_offset;
+    wtap_rec     rec;
+    Buffer       buf;
+    guint32      records;
+    guint32      data_records;
+    double       start_time;
+    double       stop_time;
+    gboolean     have_times;
+    gboolean     timed_out;
+    time_t       time_preview, time_current;
+    double       cur_time;
+
+    have_times = FALSE;
+    start_time = 0;
+    stop_time = 0;
+    records = 0;
+    data_records = 0;
+    timed_out = FALSE;
+    time(&time_preview);
+    wtap_rec_init(&rec);
+    ws_buffer_init(&buf, 1514);
+    while ((wtap_read(wth, &rec, &buf, err, err_info, &data_offset))) {
+        if (rec.presence_flags & WTAP_HAS_TS) {
+            cur_time = nstime_to_sec(&rec.ts);
+            if (!have_times) {
+                start_time = cur_time;
+                stop_time = cur_time;
+                have_times = TRUE;
+            }
+            if (cur_time < start_time) {
+                start_time = cur_time;
+            }
+            if (cur_time > stop_time){
+                stop_time = cur_time;
+            }
+        }
+
+        switch (rec.rec_type) {
+
+        case REC_TYPE_PACKET:
+        case REC_TYPE_FT_SPECIFIC_EVENT:
+        case REC_TYPE_FT_SPECIFIC_REPORT:
+        case REC_TYPE_SYSCALL:
+        case REC_TYPE_SYSTEMD_JOURNAL_EXPORT:
+            data_records++;
+            break;
+        }
+
+        records++;
+        if ((records % 1000) == 0) {
+            /* do we have a timeout? */
+            time(&time_current);
+            if (time_current-time_preview >= (time_t) prefs.gui_fileopen_preview) {
+                timed_out = TRUE;
+                break;
+            }
+        }
+        wtap_rec_reset(&rec);
+    }
+
+    stats->have_times = have_times;
+    stats->start_time = start_time;
+    stats->stop_time = stop_time;
+    stats->records = records;
+    stats->data_records = data_records;
+
+    wtap_rec_cleanup(&rec);
+    ws_buffer_free(&buf);
+
+    if (*err != 0) {
+        /* Read error. */
+        return PREVIEW_READ_ERROR;
+    }
+    return timed_out ? PREVIEW_TIMED_OUT : PREVIEW_SUCCEEDED;
+}