Function trust_dns::rr::rdata::sig::emit_pre_sig

pub fn emit_pre_sig(encoder: &mut BinEncoder, type_covered: RecordType, algorithm: Algorithm, num_labels: u8, original_ttl: u32, sig_expiration: u32, sig_inception: u32, key_tag: u16, signer_name: &Name) -> EncodeResult

specifically for outputing the RData for an RRSIG, with signer_name in canonical form