Wireshark-dev: Re: [Wireshark-dev] How to dissect bit information
From: "Anders Broman \(AL/EAB\)" <[email protected]>
Date: Mon, 18 Dec 2006 17:32:59 +0100
In addittion look at the funktion dissect_gsm_map_ISDN_AddressString() ip packet-gsm_map.c
 item = get_ber_last_created_item();
 subtree = proto_item_add_subtree(item, ett_gsm_map_isdn_address_string);
 proto_tree_add_item(subtree, hf_gsm_map_extension, parameter_tvb, 0,1,FALSE);
 proto_tree_add_item(subtree, hf_gsm_map_nature_of_number, parameter_tvb, 0,1,FALSE);
 proto_tree_add_item(subtree, hf_gsm_map_number_plan, parameter_tvb, 0,1,FALSE);
 digit_str = unpack_digits(parameter_tvb, 1);
 proto_tree_add_string(subtree, hf_gsm_map_isdn_address_digits, parameter_tvb, 1, -1, digit_str);

From: [email protected] [mailto:[email protected]] On Behalf Of Anders Broman (AL/EAB)
Sent: den 18 december 2006 16:54
To: Developer support list for Wireshark
Subject: SV: [Wireshark-dev] How to dissect bit information

The value used to mach the value string value is the "masked out" value.
So if the value is 0xc0f0 and the mask is 0xc00 the value used to match the string would be 3.

Från: [email protected] genom [email protected]
Skickat: må 2006-12-18 08:09
Till: [email protected]; [email protected]; [email protected]
Ämne: [Wireshark-dev] How to dissect bit information

Hi Anders/ Steve ,


This is with regards to the mail posted by vikash “How to dissect bit information”.

As you have suggested we can get the desired bit/bits by masking the remaining bits.But the problem we are facing

is there is a set of values assosiated with each bit / bits.In Wireshark, the “value_string” can take values pertaining to the whole octet

and therefore we are not able to understand how to capture the values assosiated with bit/bits.

I would really appreciate your help in this matter



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