HID backend

device/hid/hid_utils_mac.cc

Index: device/hid/hid_utils_mac.cc
diff --git a/device/hid/hid_utils_mac.cc b/device/hid/hid_utils_mac.cc
new file mode 100644
index 0000000000000000000000000000000000000000..588041a3ccb2b3c614b29c413236302d2af731fb
--- /dev/null
+++ b/device/hid/hid_utils_mac.cc
@@ -0,0 +1,39 @@
+// 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 "device/hid/hid_utils_mac.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/mac/foundation_util.h"
+#include "base/strings/sys_string_conversions.h"
+
+#if defined(OS_MACOSX)
+#include <CoreFoundation/CoreFoundation.h>
+#include <IOKit/hid/IOHIDManager.h>
+#endif
+
+namespace device {
+
+bool GetHidIntProperty(IOHIDDeviceRef device,
+                       CFStringRef key,
+                       int32_t* result) {
+  CFNumberRef ref = base::mac::CFCast<CFNumberRef>(
+      IOHIDDeviceGetProperty(device, key));
+  return ref && CFNumberGetValue(ref, kCFNumberSInt32Type, result);
+}
+
+bool GetHidStringProperty(IOHIDDeviceRef device,
+                          CFStringRef key,
+                          std::string* result) {
+  CFStringRef ref = base::mac::CFCast<CFStringRef>(
+      IOHIDDeviceGetProperty(device, key));
+  if (!ref) {
+    return false;
+  }
+  *result = base::SysCFStringRefToUTF8(ref);
+  return true;
+}
+
+}  // namespace device