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

1 files changed, 22 insertions, 0 deletions

diff --git a/file.c b/file.c
index cc61a67a2a..a3de5552d0 100644
--- a/file.c
+++ b/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)
 {