Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 2766] New: New function for better control for bitfield dissection

[bugzilla-daemon@xxxxxxxxxxxxx]

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2766

           Summary: New function for better control for bitfield dissection
           Product: Wireshark
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Medium
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: avn@xxxxxxxxxxxxxxx


Build Information:
TShark 1.0.99 (SVN Rev 25906)

Copyright 1998-2008 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled with GLib 2.16.3, with libpcap 0.9.8, with libz 1.2.3.3, without POSIX
capabilities, without libpcre, without SMI, without ADNS, without Lua, without
GnuTLS, without Gcrypt, without Kerberos.
NOTE: this build doesn't support the "matches" operator for Wireshark filter
syntax.

Running on Linux 2.6.24-19-generic, with libpcap version 0.9.8.

Built using gcc 4.2.3 (Ubuntu 4.2.3-2ubuntu7).
--
This patch implements a function for dissecting bitfields with better control
over the resulting representation than the existing proto_tree_add_bitmask()
routine. This function will be used by reworked IPMI/ATCA dissector (bug 2048).

The function is described in README.developer. In short, the differences are as
follows:

- The new function does not require a hf_XXX field for the whole bitmask. When
the bitmask includes several unrelated fields, such hf_XXX field does not make
sense.

- The new function allows better control over the way the sub-item descriptions
are added to the top-level item. For example, proto_tree_add_bitmask() function
does not add non-enumerated integers, does not use true_false_string to display
boolean.

- The new function allows to specify "fallback" text for the top-level item
which is used if no items were added to the top-level item.


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