1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "device/bluetooth/bluetooth_init_win.h"
6
7#include "base/threading/thread_restrictions.h"
8
9namespace {
10
11// A frame-based exception handler filter function for a handler for exceptions
12// generated by the Visual C++ delay loader helper function.
13int FilterVisualCPPExceptions(DWORD exception_code) {
14  return HRESULT_FACILITY(exception_code) == FACILITY_VISUALCPP ?
15      EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
16}
17
18}  // namespace
19
20namespace device {
21namespace bluetooth_init_win {
22
23bool HasBluetoothStack() {
24  static enum {
25    HBS_UNKNOWN,
26    HBS_YES,
27    HBS_NO,
28  } has_bluetooth_stack = HBS_UNKNOWN;
29
30  if (has_bluetooth_stack == HBS_UNKNOWN) {
31    base::ThreadRestrictions::AssertIOAllowed();
32    HRESULT hr = E_FAIL;
33    __try {
34      hr = __HrLoadAllImportsForDll("bthprops.cpl");
35    } __except(FilterVisualCPPExceptions(::GetExceptionCode())) {
36      hr = E_FAIL;
37    }
38    has_bluetooth_stack = SUCCEEDED(hr) ? HBS_YES : HBS_NO;
39  }
40
41  return has_bluetooth_stack == HBS_YES;
42}
43
44}  // namespace bluetooth_init_win
45}  // namespace device