Update the mDNS native extension for Mac OS to handle PTR and SRV records

pkg/mdns/test/decode_test.dart

Index: pkg/mdns/test/decode_test.dart
diff --git a/pkg/mdns/test/decode_test.dart b/pkg/mdns/test/decode_test.dart
index 1f7a913d074260c565b0fb4561c2757bf571bd0e..7a04b6ad6fa3298a2cd5989cc49e4d813caccfd1 100644
--- a/pkg/mdns/test/decode_test.dart
+++ b/pkg/mdns/test/decode_test.dart
@@ -3,12 +3,15 @@
 // BSD-style license that can be found in the LICENSE.md file.
 
 import 'package:expect/expect.dart';
+import 'package:mdns/src/constants.dart';
 import 'package:mdns/src/packet.dart';
 
 main() {
   testValidPackages();
   testBadPackages();
   testHexDumpList();
+  testPTRRData();
+  testSRVRData();
 }
 
 testValidPackages() {
@@ -58,6 +61,18 @@ testBadPackages() {
   }
 }
 
+testPTRRData() {
+  Expect.equals(
+    'sgjesse-macbookpro2 [78:31:c1:b8:55:38]._workstation._tcp.local',
+    readFQDN(ptrRData));
+    print(readFQDN(ptrRData2));
+  Expect.equals('fletch-agent._fletch_agent._tcp.local', readFQDN(ptrRData2));
+}
+
+testSRVRData() {
+  Expect.equals('fletch.local', readFQDN(srvRData, srvHeaderSize));
+}
+
 testHexDumpList() {
   // Call hexDumpList to get rid of hint.
   formatHexStream("");
@@ -144,6 +159,32 @@ var packagePtrResponse = <int>[
   0x78, 0x00, 0x04, 0xa9, 0xfe, 0xa7, 0xac
 ];
 
+var ptrRData = <int>[
+  0x27, 0x73, 0x67, 0x6a, 0x65, 0x73, 0x73, 0x65,
+  0x2d, 0x6d, 0x61, 0x63, 0x62, 0x6f, 0x6f, 0x6b,
+  0x70, 0x72, 0x6f, 0x32, 0x20, 0x5b, 0x37, 0x38,
+  0x3a, 0x33, 0x31, 0x3a, 0x63, 0x31, 0x3a, 0x62,
+  0x38, 0x3a, 0x35, 0x35, 0x3a, 0x33, 0x38, 0x5d,
+  0x0c, 0x5f, 0x77, 0x6f, 0x72, 0x6b, 0x73, 0x74,
+  0x61, 0x74, 0x69, 0x6f, 0x6e, 0x04, 0x5f, 0x74,
+  0x63, 0x70, 0x05, 0x6c, 0x6f, 0x63, 0x61, 0x6c,
+  0x00
+];
+
+var ptrRData2 = <int>[
+  0x0c, 0x66, 0x6c, 0x65, 0x74, 0x63, 0x68, 0x2d,
+  0x61, 0x67, 0x65, 0x6e, 0x74, 0x0d, 0x5f, 0x66,
+  0x6c, 0x65, 0x74, 0x63, 0x68, 0x5f, 0x61, 0x67,
+  0x65, 0x6e, 0x74, 0x04, 0x5f, 0x74, 0x63, 0x70,
+  0x05, 0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x00
+];
+
+var srvRData = <int> [
+  0x00, 0x00, 0x00, 0x00, 0x2f, 0x59, 0x06, 0x66,
+  0x6c, 0x65, 0x74, 0x63, 0x68, 0x05, 0x6c, 0x6f,
+  0x63, 0x61, 0x6c, 0x00
+];
+
 // Support code to generate the hex-lists above from
 // a hex-stream.
 void formatHexStream(String hexStream) {