Wireshark-dev: Re: [Wireshark-dev] proto_add_tree_item versus proto_add_tree_string
Thanks for the response.
Yes I am using a separate field name for each field. Right now they are all of type FT_STRING.
The problem I run into is the bitmask will need to be shifted depending on where in the byte the interesting bits are. Is there a way to shift the bitmasks in the hf_ struct?
The fields are always the same length its just their position in the bytes that varies.
I would really like the values to be integer values so when the user enters a filter, he doesn't have to know whether the field is a string or integer type.
Hope that helps clear it up some.
-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Stephen Fisher
Sent: Monday, March 12, 2007 6:54 PM
To: Developer support list for Wireshark
Subject: Re: [Wireshark-dev] proto_add_tree_item versus proto_add_tree_string
On Mon, Mar 12, 2007 at 02:07:59PM -0400, Neely Grady-W30566 wrote:
> Hi I am new to the list and this is my first post.
Welcome!
> I am writing a dissector plugin for Wireshark and have a question.
> If I have a set of data that I am iterating through. Sometimes the
> one message inside the data ends on a byte boundary, and others end on
> the third bit or the fifth bit or some other non-nibble boundary bit.
>
> What I want to do is print this different fields inside each message.
> But I cannot assume a bitmask will always be the same since each
> message can end essentially anywhere in the bytestream and not just on
> a boundary.
>
> Can I use the proto_tree_add_item? How would I define a bitmask in the
> hf_ structure?
Are you using the same field name for each message, no matter which bit
it ends on? In this case, you wouldn't be able to use
proto_tree_add_item() unless you defined three different field names,
each with a different bitmask. You would still need logic in the
program to determine which field to use in the proto_tree_add_item()
call. How does the protocol specify how long the bit stream will be?
Steve
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