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** IFT;

[Mark Mentovai, 2013/04/24 16:57:20]

What is IFT supposed to stand for?

CFT, IOT, and NST all made sense because they were just the prefixes of the type
families they were used with. What’s this one about?

[jeremya, 2013/04/26 03:47:40]

"Interface Type", but I guess I should pick a better name. "InterfaceT"?

+  typedef IFT element_type;
+
+  explicit ScopedIOPluginInterface(IFT object = NULL)
+      : object_(object) {
+  }
+
+  ~ScopedIOPluginInterface() {
+    if (object_)
+      (*object_)->Release(object_);
+  }
+
+  void reset(IFT object = NULL) {
+    if (object_)
+      (*object_)->Release(object_);
+    object_ = object;
+  }
+
+  bool operator==(IFT that) const {
+    return object_ == that;
+  }
+
+  bool operator!=(IFT that) const {
+    return object_ != that;
+  }
+
+  operator IFT() const {
+    return object_;
+  }
+
+  IFT get() const {
+    return object_;
+  }
+
+  void swap(ScopedIOPluginInterface& that) {
+    IFT temp = that.object_;
+    that.object_ = object_;
+    object_ = temp;
+  }
+
+  IFT release() WARN_UNUSED_RESULT {
+    IFT temp = object_;
+    object_ = NULL;
+    return temp;
+  }
+
+ private:
+  IFT object_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedIOPluginInterface);
+};
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_SCOPED_IOPLUGININTERFACE_H_