Implement support for USB Xbox360 controllers without a driver on Mac.

base/mac/scoped_ioplugininterface.h

+// Copyright (c) 2012 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.
+
+#ifndef BASE_MAC_SCOPED_IOPLUGININTERFACE_H_
+#define BASE_MAC_SCOPED_IOPLUGININTERFACE_H_
+
+#include <IOKit/IOKitLib.h>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+
+namespace base {
+namespace mac {
+
+// Just like ScopedCFTypeRef but for IOCFPlugInInterface and friends
+// (IOUSBInterfaceStruct and IOUSBDeviceStruct320 in particular).
+template<typename T>
+class ScopedIOPluginInterface {
+ public:
+  typedef T** InterfaceT;
+  typedef InterfaceT element_type;
+
+  explicit ScopedIOPluginInterface(InterfaceT object = NULL)
+      : object_(object) {
+  }
+
+  ~ScopedIOPluginInterface() {
+    if (object_)
+      (*object_)->Release(object_);
+  }
+
+  void reset(InterfaceT object = NULL) {
+    if (object_)
+      (*object_)->Release(object_);
+    object_ = object;
+  }
+
+  bool operator==(InterfaceT that) const {
+    return object_ == that;
+  }
+
+  bool operator!=(InterfaceT that) const {
+    return object_ != that;
+  }
+
+  operator InterfaceT() const {
+    return object_;
+  }
+
+  InterfaceT get() const {
+    return object_;
+  }
+
+  void swap(ScopedIOPluginInterface& that) {
+    InterfaceT temp = that.object_;
+    that.object_ = object_;
+    object_ = temp;
+  }
+
+  InterfaceT release() WARN_UNUSED_RESULT {
+    InterfaceT temp = object_;
+    object_ = NULL;
+    return temp;
+  }
+
+ private:
+  InterfaceT object_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedIOPluginInterface);
+};
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_SCOPED_IOPLUGININTERFACE_H_