END OF DATA ITEM:

In my dissector, add_item for my protocol data starting @ offset += 17;. The next function code after starts 3 bytes from the end. Example below:

hf_funky_data STARTS @ offset += 17 :START DATA: 38 43 31 39 33 44 30 33 46 30 30 30 30 :STOP DATA:

hf_funky_id always STARTS 3 bytes from the END: :START ID: 39 31 34 :END:

How do I setup my dissector so it stops 3 Bytes short, it always starts at the correct byte but always runs to the last byte in the data packet.

Thoughts?