[Roland Knall <rknall@xxxxxxxxx>]

The best way to learn such a thing is, to take a look at existing dissectors and their implementation. ip.frag_offset for example. Just search for the hf definition and its use in the source code

kind regards, Roland

Am Do., 28. Apr. 2022 um 08:33 Uhr schrieb Manojkiran Eda <manojkiran.eda@xxxxxxxxx>:

Hi All,

I am a wireshark newbie & I am trying to write a new dissector from scratch and I am looking for the best way to dissect the presence bits in a bit field based on position.

My problem is :

I have 64 bit data represented in the form of a bitfield, where the presence of b1 at a particular position tells if a particular command is supported. This 64 bit data is used for conveying how many commands(max supported is 64) are implemented.

I am trying to look at https://github.com/wireshark/wireshark/blob/master/doc/README.developer to understand what API's that i can use to acheive this - and also the best way to show this information in wireshark GUI, but haven't got any success so far.

Can anyone help point me to any leads/examples of how I can do this.

Thanks,

Manoj

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