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Wireshark-bugs: [Wireshark-bugs] [Bug 8903] New dissector for Air/Ground Datalink ICAO doc 9705

Date: Sun, 07 Jul 2013 20:38:17 +0000

Comment # 1 on bug 8903 from
Hi,
Regarding this comment:
+ developper comments:
+why not using existing ses, pres and acse dissectors ?
+        ATN upper layers are derived from OSI standards for session,
+        presentation and application but the encoding differs
+        (it's PER instead of BER encoding to save bandwith).
+        Session and presentation use the "null" encoding option,
+        meaning that they are only present at connection establishment
+        and ommitted otherwise.
+        Instead of adapting existing dissectors it seemed simpler and cleaner
+        to implement everything the new atn-ulcs dissector.

Would it make sense to have PER versions of those dissectors as separate files
in case PER encoding is used for other protocols runing on top of those as
well?
(packet-ses-per.c ... or something like that) rather than building it into the
dissector(s).


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