If you look at the documentation for ProtoField.new and friends[1], you can see
that there’s a “mask” argument. That specifies how many bits applies to this
field.
So for example, below there are 2 fields, field1 is the upper nibble of a byte,
field2 is the lower nibble of a byte:
local foo_field1 = ProtoField.uint8("foo.field1", "Field1", base.DEC, nil, 0xf0)
local foo_field2 = ProtoField.uint8("foo.field2", "Field2", base.DEC, nil, 0x0f)
- Chris
[1]:
https://www.wireshark.org/docs/wsdg_html_chunked/lua_module_Proto.html#lua_class_ProtoField
From: Wireshark-dev [mailto:[email protected]] On Behalf Of
David Aldrich
Sent: Thursday, August 30, 2018 11:51 AM
To: [email protected]
Subject: [Wireshark-dev] Can a Lua dissector access Wireshark preferences?
Hi
For my lua dissector, I want to be able to specify the bit width of a data
field using a Wireshark Preference.
Is that possible? If so, where would I find some help on how to do it?
Best regards
David
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