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"Argument 6" is the pointer to the "get PDU length" routine.

The "get PDU length" routine MUST be a routine that is passed:

• a packet_info * passed to the dissector that's calling tcp_dissect_pdu();
• a tvbuff_t * pointing to the tvbuff containing the TCP data;
• an int whose value is the offset in that tvbuff at which that PDU begins;beings;
• a void * that's the dissector data pointer passed to the dissector that's calling tcp_dissect_pdu();

and that returns the total length of the PDU, in bytes.

If that's not what your "get PDU length" routine does, you MUST change it to do so.