PACKET_FIELD_DATA_LENGTH
{ "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH },
{ "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH | PACKET_FIELD_TRANSACTION },
{ "data_length", 0, 16, PACKET_FIELD_DATA_LENGTH },
if (f->flags & PACKET_FIELD_DATA_LENGTH)