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/*
* 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