Wireshark-bugs: [Wireshark-bugs] [Bug 3694] New: FF Protocol "FMS Initiate - Version OD Calling"
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 10 Jul 2009 02:01:21 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3694

           Summary: FF Protocol "FMS Initiate - Version OD Calling" field
                    packet data not unpacked properly
           Product: Wireshark
           Version: 1.2.0
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: kingsley.turner@xxxxxxxxxxxxxxxxxxxxx


Build Information:
Version 1.2.0 (SVN Rev 28753)
--
When parsing Foundation Fieldbus protocol packets, the data body on an "FMS
Initiate" packet is not properly parsed.  The field "Version OD Calling" seems
to be interpreted as a single octet, whereas in the FF Protocol Documentation
(FF-588 and others) it is defined as a signed-16 bit (stored in network byte
order).

The result is that this value is displayed (and highlighted) as the
most-significant byte (the first byte) of the int16 rather than using both
bytes.


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