[Presentation API] Mojo typemap for content::PresentationConnectionMessage

content/public/common/presentation_connection_message.cc

 // Copyright 2015 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 "content/public/common/presentation_connection_message.h"
 
+#include <utility>
+
 namespace content {
 
+// TODO(crbug.com/524128): This restriction comes from Cast.  Raise this limit
+// for non-Cast presentations.
+const size_t kMaxPresentationConnectionMessageSize = 64 * 1024;  // 64 KB.
+
+PresentationConnectionMessage::PresentationConnectionMessage() = default;
+
 PresentationConnectionMessage::PresentationConnectionMessage(
-    PresentationMessageType type)
-    : type(type) {}
+    const std::string& message)
+    : message(std::move(message)) {}

[imcheng, 2017/02/25 01:08:40]

I believe this is still making a copy of the input string - the input needs to
be non const for std::move to actually "move".

[mark a. foltz, 2017/02/27 23:25:15]

Done.

+
+PresentationConnectionMessage::PresentationConnectionMessage(
+    const std::vector<uint8_t>& data)
+    : data(std::move(data)) {}
+
+PresentationConnectionMessage::PresentationConnectionMessage(
+    PresentationConnectionMessage&& other) {
+  if (other.is_binary()) {
+    data = std::move(other.data);

[dcheng, 2017/02/25 07:17:27]

It's legal to just write:

data = std::move(other.data);
message = std::move(other.message);

which means this can just be written:

PCM::PCM(PCM&&) = default;

[mark a. foltz, 2017/02/27 23:25:14]

Done.

+  } else {
+    message = std::move(other.message);
+  }
+}
 
 PresentationConnectionMessage::~PresentationConnectionMessage() {}
 
+bool PresentationConnectionMessage::operator==(
+    const PresentationConnectionMessage& other) const {
+  if (this->is_binary()) {
+    return other.is_binary() && this->data == other.data;
+  } else {
+    return !this->is_binary() && this->message == other.message;

[dcheng, 2017/02/25 07:17:27]

Or just write return this->data == other.data && this->message ==
other->message;

[mark a. foltz, 2017/02/27 23:25:15]

Done.

+  }
+}
+
+PresentationConnectionMessage& PresentationConnectionMessage::operator=(
+    PresentationConnectionMessage&& other) {
+  if (other.is_binary()) {
+    this->message.reset();
+    this->data = std::move(other.data);

[dcheng, 2017/02/25 07:17:27]

Ditto to the move ctor comments: it's legal to just unconditionally move both
fields (at which point this can be defaulted)

[mark a. foltz, 2017/02/27 23:25:15]

Done.

+  } else {
+    this->data.reset();
+    this->message = std::move(other.message);
+  }
+  return *this;
+}
+
 bool PresentationConnectionMessage::is_binary() const {
-  return data != nullptr;
+  return data.has_value();
 }
 
 }  // namespace content