1 files changed, 62 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/win/hstring.cc b/third_party/libwebrtc/rtc_base/win/hstring.cc
new file mode 100644
index 0000000000..5a362a97c9
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/win/hstring.cc
@@ -0,0 +1,62 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/win/hstring.h"
+
+#include <libloaderapi.h>
+#include <winstring.h>
+
+namespace {
+
+FARPROC LoadComBaseFunction(const char* function_name) {
+  static HMODULE const handle =
+      ::LoadLibraryExW(L"combase.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
+  return handle ? ::GetProcAddress(handle, function_name) : nullptr;
+}
+
+decltype(&::WindowsCreateString) GetWindowsCreateString() {
+  static decltype(&::WindowsCreateString) const function =
+      reinterpret_cast<decltype(&::WindowsCreateString)>(
+          LoadComBaseFunction("WindowsCreateString"));
+  return function;
+}
+
+decltype(&::WindowsDeleteString) GetWindowsDeleteString() {
+  static decltype(&::WindowsDeleteString) const function =
+      reinterpret_cast<decltype(&::WindowsDeleteString)>(
+          LoadComBaseFunction("WindowsDeleteString"));
+  return function;
+}
+
+}  // namespace
+
+namespace webrtc {
+
+bool ResolveCoreWinRTStringDelayload() {
+  return GetWindowsDeleteString() && GetWindowsCreateString();
+}
+
+HRESULT CreateHstring(const wchar_t* src, uint32_t len, HSTRING* out_hstr) {
+  decltype(&::WindowsCreateString) create_string_func =
+      GetWindowsCreateString();
+  if (!create_string_func)
+    return E_FAIL;
+  return create_string_func(src, len, out_hstr);
+}
+
+HRESULT DeleteHstring(HSTRING hstr) {
+  decltype(&::WindowsDeleteString) delete_string_func =
+      GetWindowsDeleteString();
+  if (!delete_string_func)
+    return E_FAIL;
+  return delete_string_func(hstr);
+}
+
+}  // namespace webrtc