Put the preview-generation loop into a common routine.

Don't have all the file open dialogs have their own copies.

Change-Id: Icd6f2fd44b081575e6481a134027c90046938c64
Reviewed-on: https://code.wireshark.org/review/25717
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 95 insertions, 0 deletions

diff --git a/ui/file_dialog.c b/ui/file_dialog.c
new file mode 100644
index 0000000000..754d4b6f5c
--- /dev/null
+++ b/ui/file_dialog.c
@@ -0,0 +1,95 @@
+/* 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_times_status
+get_times_for_preview(wtap *wth, ws_file_preview_times *times,
+                      guint32 *num_packets, int *err, gchar **err_info)
+{
+    gint64       data_offset;
+    const wtap_rec *rec;
+    guint32      packets;
+    gboolean     have_times;
+    gboolean     timed_out;
+    time_t       time_preview, time_current;
+    double       cur_time;
+
+    times->start_time = 0;
+    times->stop_time = 0;
+    packets = 0;
+    have_times = FALSE;
+    timed_out = FALSE;
+    time(&time_preview);
+    while ((wtap_read(wth, err, err_info, &data_offset))) {
+        rec = wtap_get_rec(wth);
+        if (rec->presence_flags & WTAP_HAS_TS) {
+            cur_time = nstime_to_sec(&rec->ts);
+            if (!have_times) {
+                times->start_time = cur_time;
+                times->stop_time = cur_time;
+                have_times = TRUE;
+            }
+            if (cur_time < times->start_time) {
+                times->start_time = cur_time;
+            }
+            if (cur_time > times->stop_time){
+                times->stop_time = cur_time;
+            }
+        }
+
+        packets++;
+        if (packets%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;
+            }
+        }
+    }
+    *num_packets = packets;
+    if (*err != 0) {
+        /* Read error. */
+        return PREVIEW_READ_ERROR;
+    }
+
+    if (have_times) {
+        if (timed_out)
+            return PREVIEW_TIMED_OUT;
+        else
+            return PREVIEW_HAVE_TIMES;
+    } else
+        return PREVIEW_HAVE_NO_TIMES;
+}
+
+/*
+ * Editor modelines
+ *
+ * Local Variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */