import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

ipc/mscom/Utils.cpp

@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// We need Windows 7 headers
+#ifdef NTDDI_VERSION
+#undef NTDDI_VERSION
+#endif
+#define NTDDI_VERSION 0x06010000
+#ifdef _WIN32_WINNT
+#undef _WIN32_WINNT
+#endif
+#define _WIN32_WINNT 0x0601
+
+#include "DynamicallyLinkedFunctionPtr.h"
+#include "mozilla/mscom/Utils.h"
+#include "mozilla/RefPtr.h"
+
+#include <objidl.h>
+
+static bool
+IsCurrentThreadMTALegacy()
+{
+  // We don't use RefPtr for token because CoGetContextToken does *not*
+  // increment its refcount!
+  IUnknown* token = nullptr;
+  HRESULT hr =
+    CoGetContextToken(reinterpret_cast<ULONG_PTR*>(&token));
+  if (FAILED(hr)) {
+    return false;
+  }
+
+  RefPtr<IComThreadingInfo> threadingInfo;
+  hr = token->QueryInterface(IID_IComThreadingInfo,
+                             getter_AddRefs(threadingInfo));
+  if (FAILED(hr)) {
+    return false;
+  }
+
+  APTTYPE aptType;
+  hr = threadingInfo->GetCurrentApartmentType(&aptType);
+  if (FAILED(hr)) {
+    return false;
+  }
+
+  return aptType == APTTYPE_MTA;
+}
+
+namespace mozilla {
+namespace mscom {
+
+bool
+IsCurrentThreadMTA()
+{
+  static DynamicallyLinkedFunctionPtr<decltype(&::CoGetApartmentType)>
+    pCoGetApartmentType(L"ole32.dll", "CoGetApartmentType");
+
+  if (!pCoGetApartmentType) {
+    // XP and Vista do not expose the newer API.
+    return IsCurrentThreadMTALegacy();
+  }
+
+  APTTYPE aptType;
+  APTTYPEQUALIFIER aptTypeQualifier;
+  HRESULT hr = pCoGetApartmentType(&aptType, &aptTypeQualifier);
+  if (FAILED(hr)) {
+    return false;
+  }
+
+  return aptType == APTTYPE_MTA;
+}
+
+bool
+IsProxy(IUnknown* aUnknown)
+{
+  if (!aUnknown) {
+    return false;
+  }
+
+  // Only proxies implement this interface, so if it is present then we must
+  // be dealing with a proxied object.
+  RefPtr<IClientSecurity> clientSecurity;
+  HRESULT hr = aUnknown->QueryInterface(IID_IClientSecurity,
+                                        (void**)getter_AddRefs(clientSecurity));
+  if (SUCCEEDED(hr) || hr == RPC_E_WRONG_THREAD) {
+    return true;
+  }
+  return false;
+}
+
+} // namespace mscom
+} // namespace mozilla