C++ bindings

mojo/public/bindings/lib/message_builder.cc

Index: mojo/public/bindings/lib/message_builder.cc
diff --git a/mojo/public/bindings/lib/message_builder.cc b/mojo/public/bindings/lib/message_builder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e02ffddf25e468eb7b6c20c50e86ca008f4736cd
--- /dev/null
+++ b/mojo/public/bindings/lib/message_builder.cc
@@ -0,0 +1,26 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/public/bindings/lib/message_builder.h"
+
+#include "mojo/public/bindings/lib/message.h"
+
+namespace mojo {
+
+MessageBuilder::MessageBuilder(uint32_t message_name, size_t payload_size)
+    : buf_(sizeof(MessageHeader) + payload_size) {
+  MessageHeader* header =
+      new (buf_.Allocate(sizeof(MessageHeader))) MessageHeader();
+  header->num_bytes = static_cast<uint32_t>(buf_.size());
+  header->name = message_name;
+}
+
+MessageBuilder::~MessageBuilder() {
+}
+
+MessageData* MessageBuilder::Finish() {
+  return static_cast<MessageData*>(buf_.Leak());
+}
+
+}  // namespace mojo