Add a mDNS package

pkg/mdns/test/decode_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:expect/expect.dart';
+import 'package:mdns/src/packet.dart';
+
+main() {
+  testValidPackages();
+  testBadPackages();
+}
+
+testValidPackages() {
+  var result;
+  result = decodeMDNSResponse(package1);
+  Expect.equals(1, result.length);
+  Expect.equals('raspberrypi.local', result[0].name);
+  Expect.equals('192.168.1.191', result[0].address.address);
+
+  result = decodeMDNSResponse(package2);
+  Expect.equals(2, result.length);
+  Expect.equals('raspberrypi.local', result[0].name);
+  Expect.equals('192.168.1.191', result[0].address.address);
+  Expect.equals('raspberrypi.local', result[1].name);
+  Expect.equals('169.254.95.83', result[1].address.address);
+
+  // This packet has no IPv4 address.
+  result = decodeMDNSResponse(package3);
+  Expect.equals(0, result.length);
+}
+
+testBadPackages() {
+  for (var p in [package1, package2, package3]) {
+    for (int i = 0; i < p.length; i++) {
+      decodeMDNSResponse(p.sublist(0, i));
+    }
+  }
+}
+
+// One address.
+var package1 = [
+    0x00, 0x00, 0x84, 0x00, 0x00, 0x00, 0x00, 0x01,
+    0x00, 0x00, 0x00, 0x00, 0x0b, 0x72, 0x61, 0x73,
+    0x70, 0x62, 0x65, 0x72, 0x72, 0x79, 0x70, 0x69,
+    0x05, 0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x00, 0x00,
+    0x01, 0x80, 0x01, 0x00, 0x00, 0x00, 0x78, 0x00,
+    0x04, 0xc0, 0xa8, 0x01, 0xbf];
+
+// Two addresses.
+var package2 = [
+    0x00, 0x00, 0x84, 0x00, 0x00, 0x00, 0x00, 0x02,
+    0x00, 0x00, 0x00, 0x00, 0x0b, 0x72, 0x61, 0x73,
+    0x70, 0x62, 0x65, 0x72, 0x72, 0x79, 0x70, 0x69,
+    0x05, 0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x00, 0x00,
+    0x01, 0x80, 0x01, 0x00, 0x00, 0x00, 0x78, 0x00,
+    0x04, 0xc0, 0xa8, 0x01, 0xbf, 0xc0, 0x0c, 0x00,
+    0x01, 0x80, 0x01, 0x00, 0x00, 0x00, 0x78, 0x00,
+    0x04, 0xa9, 0xfe, 0x5f, 0x53];
+
+// Seven mixed answers.
+var package3 = [
+    0x00, 0x00, 0x84, 0x00, 0x00, 0x00, 0x00, 0x08,
+    0x00, 0x00, 0x00, 0x00, 0x1f, 0x72, 0x61, 0x73,
+    0x70, 0x62, 0x65, 0x72, 0x72, 0x79, 0x70, 0x69,
+    0x20, 0x5b, 0x62, 0x38, 0x3a, 0x32, 0x37, 0x3a,
+    0x65, 0x62, 0x3a, 0x30, 0x33, 0x3a, 0x39, 0x32,
+    0x3a, 0x34, 0x62, 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, 0x00, 0x10, 0x80,
+    0x01, 0x00, 0x00, 0x11, 0x94, 0x00, 0x01, 0x00,
+    0x0b, 0x5f, 0x75, 0x64, 0x69, 0x73, 0x6b, 0x73,
+    0x2d, 0x73, 0x73, 0x68, 0xc0, 0x39, 0x00, 0x0c,
+    0x00, 0x01, 0x00, 0x00, 0x11, 0x94, 0x00, 0x0e,
+    0x0b, 0x72, 0x61, 0x73, 0x70, 0x62, 0x65, 0x72,
+    0x72, 0x79, 0x70, 0x69, 0xc0, 0x50, 0xc0, 0x68,
+    0x00, 0x21, 0x80, 0x01, 0x00, 0x00, 0x00, 0x78,
+    0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16,
+    0x0b, 0x72, 0x61, 0x73, 0x70, 0x62, 0x65, 0x72,
+    0x72, 0x79, 0x70, 0x69, 0xc0, 0x3e, 0xc0, 0x68,
+    0x00, 0x10, 0x80, 0x01, 0x00, 0x00, 0x11, 0x94,
+    0x00, 0x01, 0x00, 0x09, 0x5f, 0x73, 0x65, 0x72,
+    0x76, 0x69, 0x63, 0x65, 0x73, 0x07, 0x5f, 0x64,
+    0x6e, 0x73, 0x2d, 0x73, 0x64, 0x04, 0x5f, 0x75,
+    0x64, 0x70, 0xc0, 0x3e, 0x00, 0x0c, 0x00, 0x01,
+    0x00, 0x00, 0x11, 0x94, 0x00, 0x02, 0xc0, 0x50,
+    0xc0, 0x2c, 0x00, 0x0c, 0x00, 0x01, 0x00, 0x00,
+    0x11, 0x94, 0x00, 0x02, 0xc0, 0x0c, 0xc0, 0x0c,
+    0x00, 0x21, 0x80, 0x01, 0x00, 0x00, 0x00, 0x78,
+    0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09,
+    0xc0, 0x88, 0xc0, 0xa3, 0x00, 0x0c, 0x00, 0x01,
+    0x00, 0x00, 0x11, 0x94, 0x00, 0x02, 0xc0, 0x2c];
+
+// Support code for generating the hex-lists above.
+void hexDumpList(List package) {
+  var s = '';
+  for (int i = 0; i < package.length; i++) {
+    if (s.length != 0) s += ', ';
+    s += '0x';
+    var x = package[i].toRadixString(16);
+    if (x.length == 1) s += '0';
+    s += x;
+    if (((i + 1) % 8) == 0) {
+      s += ',';
+      print(s);
+      s = '';
+    }
+  }
+  if (s.length != 0) print(s);
+}
+