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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/com_init_balancer.h"
#include <objbase.h>
#include "base/check_op.h"
namespace base {
namespace win {
namespace internal {
ComInitBalancer::ComInitBalancer(DWORD co_init) : co_init_(co_init) {
ULARGE_INTEGER spy_cookie = {};
HRESULT hr = ::CoRegisterInitializeSpy(this, &spy_cookie);
if (SUCCEEDED(hr)) {
spy_cookie_ = spy_cookie;
}
}
ComInitBalancer::~ComInitBalancer() {
DCHECK(!spy_cookie_.has_value());
}
void ComInitBalancer::Disable() {
if (spy_cookie_.has_value()) {
::CoRevokeInitializeSpy(spy_cookie_.value());
reference_count_ = 0;
spy_cookie_.reset();
}
}
DWORD ComInitBalancer::GetReferenceCountForTesting() const {
return reference_count_;
}
IFACEMETHODIMP
ComInitBalancer::PreInitialize(DWORD apartment_type, DWORD reference_count) {
return S_OK;
}
IFACEMETHODIMP
ComInitBalancer::PostInitialize(HRESULT result,
DWORD apartment_type,
DWORD new_reference_count) {
reference_count_ = new_reference_count;
return result;
}
IFACEMETHODIMP
ComInitBalancer::PreUninitialize(DWORD reference_count) {
if (reference_count == 1 && spy_cookie_.has_value()) {
// Increase the reference count to prevent premature and unbalanced
// uninitalization of the COM library.
::CoInitializeEx(nullptr, co_init_);
}
return S_OK;
}
IFACEMETHODIMP
ComInitBalancer::PostUninitialize(DWORD new_reference_count) {
reference_count_ = new_reference_count;
return S_OK;
}
} // namespace internal
} // namespace win
} // namespace base
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