Gamepad API: add support for connection events

content/common/gamepad_param_traits.cc

+// Copyright (c) 2014 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/common/gamepad_param_traits.h"
+
+#include "base/pickle.h"
+#include "base/strings/string16.h"
+#include "base/strings/utf_string_conversions.h"
+#include "ipc/ipc_message_utils.h"
+#include "third_party/WebKit/public/platform/WebGamepad.h"
+
+using blink::WebGamepad;
+
+namespace {
+
+void LogWebUCharString(
+    const blink::WebUChar web_string[],
+    const size_t array_size,
+    std::string* log) {
+  base::string16 utf16;
+  utf16.reserve(array_size);
+  for (size_t i = 0; i < array_size && web_string[i]; ++i) {
+    utf16[i] = web_string[i];
+  }
+  log->append(base::UTF16ToUTF8(utf16));
+}
+
+}
+
+namespace IPC {
+
+void ParamTraits<WebGamepad>::Write(
+    Message* m,
+    const WebGamepad& p) {
+  m->WriteBool(p.connected);
+  m->WriteData(reinterpret_cast<const char*>(p.id), sizeof(p.id));
+  m->WriteUInt64(p.timestamp);
+  m->WriteUInt32(p.axesLength);
+  m->WriteData(reinterpret_cast<const char*>(p.axes), sizeof(p.axes));
+  m->WriteUInt32(p.buttonsLength);
+  m->WriteData(reinterpret_cast<const char*>(p.buttons), sizeof(p.buttons));
+  m->WriteData(reinterpret_cast<const char*>(p.mapping), sizeof(p.mapping));
+}
+
+bool ParamTraits<WebGamepad>::Read(
+    const Message* m,
+    PickleIterator* iter,
+    WebGamepad* p) {
+  if (!m->ReadBool(iter, &p->connected)) return false;
+
+  int length;
+  const char* data;
+  if (!m->ReadData(iter, &data, &length) || length != sizeof(p->id))
+    return false;
+  memcpy(p->id, data, length);
+
+  COMPILE_ASSERT(sizeof(p->timestamp) == sizeof(uint64),
+                 timestamp_cannot_encoded_as_uint64);
+  if (!m->ReadUInt64(iter, reinterpret_cast<uint64*>(&p->timestamp)))
+    return false;
+  if (!m->ReadUInt32(iter, &p->axesLength)) return false;
+  if (!m->ReadData(iter, &data, &length) || length != sizeof(p->axes))
+    return false;
+  memcpy(p->axes, data, length);
+  if (!m->ReadUInt32(iter, &p->buttonsLength)) return false;
+  if (!m->ReadData(iter, &data, &length) || length != sizeof(p->buttons))
+    return false;
+  memcpy(p->buttons, data, length);
+  if (!m->ReadData(iter, &data, &length) || length != sizeof(p->mapping))
+    return false;
+  memcpy(p->mapping, data, length);
+
+  return true;
+}
+
+void ParamTraits<WebGamepad>::Log(
+    const WebGamepad& p,
+    std::string* l) {
+  l->append("WebGamepad(");
+  LogParam(p.connected, l);
+  LogWebUCharString(p.id, WebGamepad::idLengthCap, l);
+  l->append(",");
+  LogWebUCharString(p.mapping, WebGamepad::mappingLengthCap, l);
+  l->append(",");
+  LogParam(p.timestamp, l);
+  l->append(",");
+  LogParam(p.axesLength, l);
+  l->append(", [");
+  for (size_t i = 0; i < arraysize(p.axes); ++i) {
+    l->append(base::StringPrintf("%f%s", p.axes[i],
+        i < (arraysize(p.axes) - 1) ? ", " : "], "));
+  }
+  LogParam(p.buttonsLength, l);
+  l->append(", [");
+  for (size_t i = 0; i < arraysize(p.buttons); ++i) {
+    l->append(base::StringPrintf("(%u, %f)%s",
+        p.buttons[i].pressed, p.buttons[i].value,
+        i < (arraysize(p.buttons) - 1) ? ", " : "], "));
+  }
+  l->append(")");
+}
+
+} // namespace IPC