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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/hstring_reference.h"
#include <windows.h>
#include <winstring.h>
#include "base/check_op.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/char_traits.h"
namespace base {
namespace {
bool g_winrt_string_loaded = false;
decltype(&::WindowsCreateStringReference) GetWindowsCreateStringReference() {
static auto const create_string_reference_func =
[]() -> decltype(&::WindowsCreateStringReference) {
const HMODULE handle =
::LoadLibraryEx(L"combase.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
if (handle) {
return reinterpret_cast<decltype(&::WindowsCreateStringReference)>(
::GetProcAddress(handle, "WindowsCreateStringReference"));
}
return nullptr;
}();
return create_string_reference_func;
}
} // namespace
namespace win {
// static
bool HStringReference::ResolveCoreWinRTStringDelayload() {
g_winrt_string_loaded = GetWindowsCreateStringReference() != nullptr;
return g_winrt_string_loaded;
}
HStringReference::HStringReference(const wchar_t* str, size_t length) {
DCHECK(g_winrt_string_loaded);
// String must be null terminated for WindowsCreateStringReference.
// nullptr str is OK so long as the length is 0.
DCHECK(str ? str[length] == L'\0' : length == 0);
// If you nullptr crash here, you've failed to call
// ResolveCoreWinRTStringDelayLoad and check its return value.
const HRESULT hr = GetWindowsCreateStringReference()(
str, checked_cast<UINT32>(length), &hstring_header_, &hstring_);
// All failure modes of WindowsCreateStringReference are handled gracefully
// but this class.
DCHECK_EQ(hr, S_OK);
}
HStringReference::HStringReference(const wchar_t* str)
: HStringReference(str, str ? CharTraits<wchar_t>::length(str) : 0) {}
} // namespace win
} // namespace base
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