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/* -*- 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/. */
#include "mozilla/mscom/DispatchForwarder.h"
#include <oleauto.h>
#include <utility>
#include "mozilla/mscom/MainThreadInvoker.h"
namespace mozilla {
namespace mscom {
/* static */
HRESULT DispatchForwarder::Create(IInterceptor* aInterceptor,
STAUniquePtr<IDispatch>& aTarget,
IUnknown** aOutput) {
MOZ_ASSERT(aInterceptor && aOutput);
if (!aOutput) {
return E_INVALIDARG;
}
*aOutput = nullptr;
if (!aInterceptor) {
return E_INVALIDARG;
}
DispatchForwarder* forwarder = new DispatchForwarder(aInterceptor, aTarget);
HRESULT hr = forwarder->QueryInterface(IID_IDispatch, (void**)aOutput);
forwarder->Release();
return hr;
}
DispatchForwarder::DispatchForwarder(IInterceptor* aInterceptor,
STAUniquePtr<IDispatch>& aTarget)
: mRefCnt(1), mInterceptor(aInterceptor), mTarget(std::move(aTarget)) {}
DispatchForwarder::~DispatchForwarder() {}
HRESULT
DispatchForwarder::QueryInterface(REFIID riid, void** ppv) {
if (!ppv) {
return E_INVALIDARG;
}
// Since this class implements a tearoff, any interfaces that are not
// IDispatch must be routed to the original object's QueryInterface.
// This is especially important for IUnknown since COM uses that interface
// to determine object identity.
if (riid != IID_IDispatch) {
return mInterceptor->QueryInterface(riid, ppv);
}
IUnknown* punk = static_cast<IDispatch*>(this);
*ppv = punk;
if (!punk) {
return E_NOINTERFACE;
}
punk->AddRef();
return S_OK;
}
ULONG
DispatchForwarder::AddRef() {
return (ULONG)InterlockedIncrement((LONG*)&mRefCnt);
}
ULONG
DispatchForwarder::Release() {
ULONG newRefCnt = (ULONG)InterlockedDecrement((LONG*)&mRefCnt);
if (newRefCnt == 0) {
delete this;
}
return newRefCnt;
}
HRESULT
DispatchForwarder::GetTypeInfoCount(UINT* pctinfo) {
if (!pctinfo) {
return E_INVALIDARG;
}
*pctinfo = 1;
return S_OK;
}
HRESULT
DispatchForwarder::GetTypeInfo(UINT iTInfo, LCID lcid, ITypeInfo** ppTInfo) {
// ITypeInfo as implemented by COM is apartment-neutral, so we don't need
// to wrap it (yay!)
if (mTypeInfo) {
RefPtr<ITypeInfo> copy(mTypeInfo);
copy.forget(ppTInfo);
return S_OK;
}
HRESULT hr = E_UNEXPECTED;
auto fn = [&]() -> void { hr = mTarget->GetTypeInfo(iTInfo, lcid, ppTInfo); };
MainThreadInvoker invoker;
if (!invoker.Invoke(
NS_NewRunnableFunction("DispatchForwarder::GetTypeInfo", fn))) {
return E_UNEXPECTED;
}
if (FAILED(hr)) {
return hr;
}
mTypeInfo = *ppTInfo;
return hr;
}
HRESULT
DispatchForwarder::GetIDsOfNames(REFIID riid, LPOLESTR* rgszNames, UINT cNames,
LCID lcid, DISPID* rgDispId) {
HRESULT hr = E_UNEXPECTED;
auto fn = [&]() -> void {
hr = mTarget->GetIDsOfNames(riid, rgszNames, cNames, lcid, rgDispId);
};
MainThreadInvoker invoker;
if (!invoker.Invoke(
NS_NewRunnableFunction("DispatchForwarder::GetIDsOfNames", fn))) {
return E_UNEXPECTED;
}
return hr;
}
HRESULT
DispatchForwarder::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid,
WORD wFlags, DISPPARAMS* pDispParams,
VARIANT* pVarResult, EXCEPINFO* pExcepInfo,
UINT* puArgErr) {
HRESULT hr;
if (!mInterface) {
if (!mTypeInfo) {
return E_UNEXPECTED;
}
TYPEATTR* typeAttr = nullptr;
hr = mTypeInfo->GetTypeAttr(&typeAttr);
if (FAILED(hr)) {
return hr;
}
hr = mInterceptor->QueryInterface(typeAttr->guid,
(void**)getter_AddRefs(mInterface));
mTypeInfo->ReleaseTypeAttr(typeAttr);
if (FAILED(hr)) {
return hr;
}
}
// We don't invoke IDispatch on the target, but rather on the interceptor!
hr = ::DispInvoke(mInterface.get(), mTypeInfo, dispIdMember, wFlags,
pDispParams, pVarResult, pExcepInfo, puArgErr);
return hr;
}
} // namespace mscom
} // namespace mozilla
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