Make rr_mk public and call it TypeToRR

dns_test.go

@@ -437,7 +437,7 @@ func TestToRFC3597(t *testing.T) {
 
 func TestNoRdataPack(t *testing.T) {
 	data := make([]byte, 1024)
-	for typ, fn := range rr_mk {
+	for typ, fn := range TypeToRR {
 		if typ == TypeCAA {
 			continue // TODO(miek): known omission
 		}
@@ -454,7 +454,7 @@ func TestNoRdataPack(t *testing.T) {
 // TODO(miek): fix dns buffer too small errors this throws
 func TestNoRdataUnpack(t *testing.T) {
 	data := make([]byte, 1024)
-	for typ, fn := range rr_mk {
+	for typ, fn := range TypeToRR {
 		if typ == TypeSOA || typ == TypeTSIG || typ == TypeWKS {
 			// SOA, TSIG will not be seen (like this) in dyn. updates?
 			// WKS is an bug, but...deprecated record.

msg.go

@@ -1329,7 +1329,7 @@ func UnpackRR(msg []byte, off int) (rr RR, off1 int, err error) {
 	}
 	end := off + int(h.Rdlength)
 	// make an rr of that type and re-unpack.
-	mk, known := rr_mk[h.Rrtype]
+	mk, known := TypeToRR[h.Rrtype]
 	if !known {
 		rr = new(RFC3597)
 	} else {

types.go

@@ -1575,8 +1575,8 @@ func copyIP(ip net.IP) net.IP {
 	return p
 }
 
-// Map of constructors for each RR wire type.
-var rr_mk = map[uint16]func() RR{
+// Map of constructors for each RR type.
+var TypeToRR = map[uint16]func() RR{
 	TypeA:     func() RR { return new(A) },
 	TypeAAAA:  func() RR { return new(AAAA) },
 	TypeAFSDB: func() RR { return new(AFSDB) },