Protocol Buffer runtime library and 'protoc' plugin

lib/protobuf/runtime/WireFormat.dart

Index: lib/protobuf/runtime/WireFormat.dart
diff --git a/lib/protobuf/runtime/WireFormat.dart b/lib/protobuf/runtime/WireFormat.dart
new file mode 100644
index 0000000000000000000000000000000000000000..941d88a1065ff6f4f6bfc29e95a3bb26f9e8a9c5
--- /dev/null
+++ b/lib/protobuf/runtime/WireFormat.dart
@@ -0,0 +1,28 @@
+// Copyright (c) 2011, 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.
+
+class WireFormat {
+
+  static final int TAG_TYPE_BITS = 3;
+  static final int TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1;
+
+  static final int WIRETYPE_VARINT = 0;
+  static final int WIRETYPE_FIXED64 = 1;
+  static final int WIRETYPE_LENGTH_DELIMITED = 2;
+  static final int WIRETYPE_START_GROUP = 3;
+  static final int WIRETYPE_END_GROUP = 4;
+  static final int WIRETYPE_FIXED32 = 5;
+
+  static int getTagFieldNumber(int tag) {
+    return (tag & 0x7fffffff) >> TAG_TYPE_BITS; // >>>
+  }
+
+  static int getTagWireType(final int tag) {
+    return tag & TAG_TYPE_MASK;
+  }
+
+  static int makeTag(int fieldNumber, final int wireType) {
+    return (fieldNumber << TAG_TYPE_BITS) | wireType;
+  }
+}