From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx]
On Behalf Of Vishnu Bhatt
Sent: den 16 februari 2015 14:55
To: Developer support list for Wireshark
Subject: [Wireshark-dev] function of dissector_try_uint()
>Hi,
>
>I have a dissector code (atmii) and I am having problem in understanding the following two lines of code:
>
>In proto_register_atmii()
>
>aal_dissector_table = register_dissector_table("atmii.aal2_payload", "AAL payload type", FT_UINT8, BASE_DEC);
Registers a dissector table with the name atmii.aal2_payload
in which it will be possible to register a callback for an UINT8 value. Compare with the UDP table where a dissector can
Register to be called for a message with UDP port number. SIP registers for port 5060 for instance.
and then in dissect_atmii()
if (!dissector_try_port(aal_dissector_table, payload_type, next_tvb, pinfo, tree)) {
proto_tree_add_item(atmii_tree,hf_atmii_aal2_payload, tvb, ATM_HEADER_LENGTH, -1, FALSE);
}
The atmii.aal2_payload
table will be searched for a match on payload type if a match is found the callback will be executed handing next_tvb to the called function.
If no match is found(no dissector registered for the payload type FALSE will be returned.
>What does these two lines of code do in general as I’ve seen them in other protocols as well?
Thanks
Vishnu
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