Packet and Fields API

[gabhijit]

Right now our dissector - just dumps the json of the packet and does nothing else. But for a better programmability - A dissector should support at-least following APIs (which actually mimic wireshark's API, but are more Pythonic)

Packet - is a tree of Field s and a Buffer and some metadata (Think of things from pcap_header)

A Field maps roughly to wireshark's proto_node and fileld_info structure combined - among other things it should have -

1. Name
2. Abbrev
3. summary (something that we are dumping in json)
4. details (something we are dumping in Packet Details)
5. Level (just easier for displaying)
6. start / length -> 'offset' into Packet's byte array.
7. first_child, last_child, parent, next