Don't enable "Save As" if you don't have an unsaved live capture file

and there are no formats in which the file can be saved by some means
other than copying the raw data; "Save As" isn't a very useful function
in that case, and that prevents us from having an empty list of formats
in which the file can be saved.

svn path=/trunk/; revision=21032

file.c

@@ -3332,6 +3332,28 @@ save_packet(capture_file *cf _U_, frame_data *fdata,
   return TRUE;
 }
 
+/*
+ * Can this capture file be saved in any format except by copying the raw data?
+ */
+gboolean
+cf_can_save_as(capture_file *cf)
+{
+  int ft;
+
+  for (ft = 0; ft < WTAP_NUM_FILE_TYPES; ft++) {
+    /* To save a file with Wiretap, Wiretap has to handle that format,
+       and its code to handle that format must be able to write a file
+       with this file's encapsulation type. */
+    if (wtap_dump_can_open(ft) && wtap_dump_can_write_encap(ft, cf->lnk_t)) {
+      /* OK, we can write it out in this type. */
+      return TRUE;
+    }
+  }
+
+  /* No, we couldn't save it in any format. */
+  return FALSE;
+}
+
 cf_status_t
 cf_save(capture_file *cf, const char *fname, packet_range_t *range, guint save_format, gboolean compressed)
 {

file.h

@@ -153,6 +153,15 @@ cf_read_status_t cf_continue_tail(capture_file *cf, int to_read, int *err);
  */
 cf_read_status_t cf_finish_tail(capture_file *cf, int *err);
 
+/**
+ * Determine whether this capture file (or a range of it) can be saved
+ * (except by copying the raw file data).
+ * 
+ * @param cf the capture file to check
+ * @return TRUE if it can be saved, FALSE if it can't
+ */
+gboolean cf_can_save_as(capture_file *cf);
+
 /**
  * Save a capture file (or a range of it).
  * 

gtk/main.c

@@ -1494,8 +1494,7 @@ main_cf_cb_file_closing(capture_file *cf)
     set_main_window_name("The Wireshark Network Analyzer");
 
     /* Disable all menu items that make sense only if you have a capture. */
-    set_menus_for_capture_file(FALSE);
-    set_menus_for_unsaved_capture_file(FALSE);
+    set_menus_for_capture_file(NULL);
     set_menus_for_captured_packets(FALSE);
     set_menus_for_selected_packet(cf);
     set_menus_for_capture_in_progress(FALSE);
@@ -1542,9 +1541,8 @@ main_cf_cb_file_read_finished(capture_file *cf)
     set_display_filename(cf);
 
     /* Enable menu items that make sense if you have a capture file you've
-     finished reading. */
-    set_menus_for_capture_file(TRUE);
-    set_menus_for_unsaved_capture_file(!cf->user_saved);
+       finished reading. */
+    set_menus_for_capture_file(cf);
 
     /* Enable menu items that make sense if you have some captured packets. */
     set_menus_for_captured_packets(TRUE);
@@ -1745,9 +1743,8 @@ main_cf_cb_live_capture_update_finished(capture_file *cf)
     set_menus_for_capture_in_progress(FALSE);
 
     /* Enable menu items that make sense if you have a capture file
-     you've finished reading. */
-    set_menus_for_capture_file(TRUE);
-    set_menus_for_unsaved_capture_file(!cf->user_saved);
+       you've finished reading. */
+    set_menus_for_capture_file(cf);
 
     /* Set up main window for a capture file. */
     main_set_for_capture_file(TRUE);
@@ -1952,7 +1949,7 @@ main_cf_cb_file_safe_failed(gpointer data _U_)
 static void
 main_cf_cb_file_safe_reload_finished(gpointer data _U_)
 {
-    set_menus_for_unsaved_capture_file(FALSE);
+    set_menus_for_capture_file(&cfile);
 }
 
 static void main_cf_callback(gint event, gpointer data, gpointer user_data _U_)

gtk/menu.c

@@ -886,8 +886,7 @@ menus_init(void) {
     merge_all_tap_menus(tap_menu_tree_root);
 
     /* Initialize enabled/disabled state of menu items */
-    set_menus_for_unsaved_capture_file(FALSE);
-    set_menus_for_capture_file(FALSE);
+    set_menus_for_capture_file(NULL);
 #if 0
     /* Un-#if this when we actually implement Cut/Copy/Paste.
        Then make sure you enable them when they can be done. */
@@ -2088,32 +2087,41 @@ popup_menu_handler(GtkWidget *widget, GdkEvent *event, gpointer data)
 }
 
 /* Enable or disable menu items based on whether you have a capture file
-   you've finished reading. */
+   you've finished reading and, if you have one, whether it's been saved
+   and whether it could be saved except by copying the raw packet data. */
 void
-set_menus_for_capture_file(gboolean have_capture_file)
+set_menus_for_capture_file(capture_file *cf)
 {
-  set_menu_sensitivity(main_menu_factory, "/File/Open...", have_capture_file);
-  set_menu_sensitivity(main_menu_factory, "/File/Open Recent", have_capture_file);
-  set_menu_sensitivity(main_menu_factory, "/File/Merge...", have_capture_file);
-  set_menu_sensitivity(main_menu_factory, "/File/Close", have_capture_file);
-  set_menu_sensitivity(main_menu_factory, "/File/Save As...",
-      have_capture_file);
-  set_menu_sensitivity(main_menu_factory, "/File/Export", have_capture_file);
-  set_menu_sensitivity(main_menu_factory, "/View/Reload", have_capture_file);
-  set_toolbar_for_capture_file(have_capture_file);
+  if (cf == NULL) {
+    /* We have no capture file */
+    set_menu_sensitivity(main_menu_factory, "/File/Merge...", FALSE);
+    set_menu_sensitivity(main_menu_factory, "/File/Close", FALSE);
+    set_menu_sensitivity(main_menu_factory, "/File/Save", FALSE);
+    set_menu_sensitivity(main_menu_factory, "/File/Save As...", FALSE);
+    set_menu_sensitivity(main_menu_factory, "/File/Export", FALSE);
+    set_menu_sensitivity(main_menu_factory, "/View/Reload", FALSE);
+    set_toolbar_for_capture_file(FALSE);
+    set_toolbar_for_unsaved_capture_file(FALSE);
+  } else {
+    set_menu_sensitivity(main_menu_factory, "/File/Merge...", TRUE);
+    set_menu_sensitivity(main_menu_factory, "/File/Close", TRUE);
+    set_menu_sensitivity(main_menu_factory, "/File/Save", !cf->user_saved);
+    /*
+     * "Save As..." works only if we can write the file out in at least
+     * one format (so we can save the whole file or just a subset) or
+     * if we have an unsaved capture (so writing the whole file out
+     * with a raw data copy makes sense).
+     */
+    set_menu_sensitivity(main_menu_factory, "/File/Save As...",
+        cf_can_save_as(cf) || !cf->user_saved);
+    set_menu_sensitivity(main_menu_factory, "/File/Export", TRUE);
+    set_menu_sensitivity(main_menu_factory, "/View/Reload", TRUE);
+    set_toolbar_for_unsaved_capture_file(!cf->user_saved);
+    set_toolbar_for_capture_file(TRUE);
+  }
   packets_bar_update();
 }
 
-/* Enable or disable menu items based on whether you have an unsaved
-   capture file you've finished reading. */
-void
-set_menus_for_unsaved_capture_file(gboolean have_unsaved_capture_file)
-{
-  set_menu_sensitivity(main_menu_factory, "/File/Save",
-      have_unsaved_capture_file);
-  set_toolbar_for_unsaved_capture_file(have_unsaved_capture_file);
-}
-
 /* Enable or disable menu items based on whether there's a capture in
    progress. */
 void

menu.h

@@ -38,12 +38,9 @@ void add_menu_recent_capture_file(gchar *file);
 /* Routines to enable or disable sets of menu items. */
 
 /* Enable or disable menu items based on whether you have a capture file
-   you've finished reading. */
-void set_menus_for_capture_file(gboolean);
-
-/* Enable or disable menu items based on whether you have an unsaved
-   capture file you've finished reading. */
-void set_menus_for_unsaved_capture_file(gboolean);
+   you've finished reading and, if you have one, whether it's been saved
+   and whether it could be saved except by copying the raw packet data. */
+void set_menus_for_capture_file(capture_file *);
 
 /* Enable or disable menu items based on whether there's a capture in
    progress. */