rr_calculate_uncompressed_rdata_length
rdlen_uncompressed = rr_calculate_uncompressed_rdata_length(rr);
code = rr_calculate_uncompressed_rdata_length(rr);
size = rr_calculate_uncompressed_rdata_length(rr);
int32_t rr_calculate_uncompressed_rdata_length(const rr_type* rr);