Add to tvbuffs a "fragment length" field; if the tvbuff represents the

first fragment of a non-reassembled packet, and we know the length the
packet would have if it were reassembled, this field holds the length of
the fragment, and the "reported length" field shows the length the
packet would have if it were reassembled, so going past the end of the
fragment but staying within the length of the reassembled packet can be
reported as "dissection would have worked if the packet had been
reassembled" rather than "the packet is too short, so it was probably
malformed".

Add a FragmentBoundsError exception, thrown in the "dissection would
have worked if the packet had been reassembled" case.

Add a new tvb_new_subset_length_fragment() routine to create a new
subset tvb with specified fragment and reported lengths.  Use it in the
CLNP dissector.

Add some more sanity checks in the CLNP dissector.

svn path=/trunk/; revision=48917

1 files changed, 6 insertions, 0 deletions

diff --git a/epan/tvbuff-int.h b/epan/tvbuff-int.h
index 1dd1be90c6..33057bdd87 100644
--- a/epan/tvbuff-int.h
+++ b/epan/tvbuff-int.h
@@ -79,6 +79,12 @@ struct tvbuff {
 	/** Reported length. */
 	guint			reported_length;
 
+	/* If this tvbuff represents the first fragment of a larger packet
+	 * that was not reassembled, this is the length of the fragment
+	 * ("reported_length" will be the length of the full packet).
+	 */
+	guint			fragment_length;
+
 	/* Offset from beginning of first TVBUFF_REAL. */
 	gint			raw_offset;