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      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 
      9 namespace {
     10 
     11 // A frame-based exception handler filter function for a handler for exceptions
     12 // generated by the Visual C++ delay loader helper function.
     13 int FilterVisualCPPExceptions(DWORD exception_code) {
     14   return HRESULT_FACILITY(exception_code) == FACILITY_VISUALCPP ?
     15       EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
     16 }
     17 
     18 }  // namespace
     19 
     20 namespace device {
     21 namespace bluetooth_init_win {
     22 
     23 bool 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