Wireshark · Wireshark-dev: Re: [Wireshark-dev] Dissecting a field that has non-octet bit boundaries

[yannick omnes <yomnes@xxxxxxxxxxx>]

Hi Richard,

I had the same problem recently, that I solved using a bitmask in one of 
the register_info fields. It looked like that :

{
&hf_protocol_id,
            {
                "ID", "protocol.id",
                FT_UINT8, BASE_DEC_HEX,
                NULL, 0x1,
                NULL, HFILL
            },
        }

This should display only the first bit of a byte.

Hope that helps,

Regards

Yannick


Le 23/01/2015 05:46, Richard Sharpe a écrit :
> Hi Folks,
>
> I am trying to dissect MS-RSVD further since I have a capture of some
> of that funky SCSI tunneled over SMB2/3.
>
> Anyway, they have a 4-byte header that consists of:
>
> 1 byte:  Protocol ID
> 12 bits: Protocol Version
> 12 bits: Operation Code
>
> How do I deal with this. It does not seem like proto_tree_add_bitmask
> is the correct thing.