Wireshark · Wireshark-dev: Re: [Wireshark-dev] Field with flags dissected

["Crawford, Anthony R" <Anthony.R.Crawford@xxxxxxxxxxx>]

Thanks this was the elegant solution:

 

proto_tree_add_bitmask_with_flags(sub_tree, tvb, offset, msg_id, ett_dsmcc_message_id, bf_message_id, ENC_NA, BMT_NO_APPEND);

 

AC

From: Wireshark-dev <wireshark-dev-bounces@xxxxxxxxxxxxx> On Behalf Of Alexis La Goutte
Sent: Wednesday, August 14, 2019 2:32 AM
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Field with flags dissected

 

Hi

 

Look proto_tree_add_bitmask_with_flags and there is a flag for don't append the top

 

Cheers

 

On Sat, Aug 10, 2019 at 12:48 AM Crawford, Anthony R <Anthony.R.Crawford@xxxxxxxxxxx> wrote:

Hi all,

I need some help dissecting a field with its flags. I am trying to present the dissection of a single field with its value, then the dissected flags under it, presented like this:

 

Message ID: 0x8013

    10.. .... .... .... = Message Discriminator: Server and Network (2)

    ..00 0000 0001 .... = Message Scenario: Session Setup (1)

    .... .... .... 0011 = Message Type: Response Message (3)

 

However it is being presented like this instead:

 

Message ID: 0x8013, Message Discriminator: Server and Network, Message Scenario: Session Setup, Message Type: Response Message

    10.. .... .... .... = Message Discriminator: Server and Network (2)

    ..00 0000 0001 .... = Message Scenario: Session Setup (1)

    .... .... .... 0011 = Message Type: Response Message (3)

 

Anything after the 0x8013 in the same line I do not need.

 

Here is my code:

 

static const int *message_id_bits[] = {

        &hf_dsmcc_un_sess_flag_message_discriminator,

        &hf_dsmcc_un_sess_flag_message_scenario,

        &hf_dsmcc_un_sess_flag_message_type

    };

 

proto_tree_add_bitmask(sub_tree, tvb, offset, hf_dsmcc_message_id, ett_dsmcc_message_id, message_id_bits, ENC_NA);

 

 

I’ve spent the whole day trying to figure out how to present bitwise dissections. I haven’t been able to find the right solution despite reading dissection docs and other source codes.

 

 

Thanks,

Anthony

 

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