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Diffstat (limited to '')
-rw-r--r-- | ipc/mscom/oop/Handler.cpp | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/ipc/mscom/oop/Handler.cpp b/ipc/mscom/oop/Handler.cpp new file mode 100644 index 0000000000..1c40e5300f --- /dev/null +++ b/ipc/mscom/oop/Handler.cpp @@ -0,0 +1,281 @@ +/* -*- 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 "Handler.h" +#include "Module.h" + +#include "mozilla/ArrayUtils.h" +#include "mozilla/Assertions.h" +#include "mozilla/mscom/Objref.h" +#include "nsWindowsHelpers.h" + +#include <objbase.h> +#include <shlwapi.h> +#include <string.h> + +/* WARNING! The code in this file may be loaded into the address spaces of other + processes! It MUST NOT link against xul.dll or other Gecko binaries! Only + inline code may be included! */ + +namespace mozilla { +namespace mscom { + +Handler::Handler(IUnknown* aOuter, HRESULT* aResult) + : mRefCnt(0), mOuter(aOuter), mUnmarshal(nullptr), mHasPayload(false) { + MOZ_ASSERT(aResult); + + if (!aOuter) { + *aResult = E_INVALIDARG; + return; + } + + StabilizedRefCount<ULONG> stabilizer(mRefCnt); + + *aResult = + ::CoGetStdMarshalEx(aOuter, SMEXF_HANDLER, getter_AddRefs(mInnerUnk)); + if (FAILED(*aResult)) { + return; + } + + *aResult = mInnerUnk->QueryInterface(IID_IMarshal, (void**)&mUnmarshal); + if (FAILED(*aResult)) { + return; + } + + // mUnmarshal is a weak ref + mUnmarshal->Release(); +} + +HRESULT +Handler::InternalQueryInterface(REFIID riid, void** ppv) { + if (!ppv) { + return E_INVALIDARG; + } + + if (riid == IID_IUnknown) { + RefPtr<IUnknown> punk(static_cast<IUnknown*>(&mInternalUnknown)); + punk.forget(ppv); + return S_OK; + } + + if (riid == IID_IMarshal) { + RefPtr<IMarshal> ptr(this); + ptr.forget(ppv); + return S_OK; + } + + // Try the handler implementation + HRESULT hr = QueryHandlerInterface(mInnerUnk, riid, ppv); + if (hr == S_FALSE) { + // The handler knows this interface is not available, so don't bother + // asking the proxy. + return E_NOINTERFACE; + } + if (hr != E_NOINTERFACE) { + return hr; + } + + // Now forward to the marshaler's inner + return mInnerUnk->QueryInterface(riid, ppv); +} + +ULONG +Handler::InternalAddRef() { + if (!mRefCnt) { + Module::Lock(); + } + return ++mRefCnt; +} + +ULONG +Handler::InternalRelease() { + ULONG newRefCnt = --mRefCnt; + if (newRefCnt == 0) { + delete this; + Module::Unlock(); + } + return newRefCnt; +} + +HRESULT +Handler::GetUnmarshalClass(REFIID riid, void* pv, DWORD dwDestContext, + void* pvDestContext, DWORD mshlflags, CLSID* pCid) { + return mUnmarshal->GetUnmarshalClass(MarshalAs(riid), pv, dwDestContext, + pvDestContext, mshlflags, pCid); +} + +HRESULT +Handler::GetMarshalSizeMax(REFIID riid, void* pv, DWORD dwDestContext, + void* pvDestContext, DWORD mshlflags, DWORD* pSize) { + if (!pSize) { + return E_INVALIDARG; + } + + *pSize = 0; + + RefPtr<IUnknown> unkToMarshal; + HRESULT hr; + + REFIID marshalAs = MarshalAs(riid); + if (marshalAs == riid) { + unkToMarshal = static_cast<IUnknown*>(pv); + } else { + hr = mInnerUnk->QueryInterface(marshalAs, getter_AddRefs(unkToMarshal)); + if (FAILED(hr)) { + return hr; + } + } + + // We do not necessarily want to use the pv that COM is giving us; we may want + // to marshal a different proxy that is more appropriate to what we're + // wrapping... + hr = mUnmarshal->GetMarshalSizeMax(marshalAs, unkToMarshal.get(), + dwDestContext, pvDestContext, mshlflags, + pSize); + +#if defined(MOZ_MSCOM_REMARSHAL_NO_HANDLER) + return hr; +#else + if (FAILED(hr)) { + return hr; + } + + if (!HasPayload()) { + return S_OK; + } + + DWORD payloadSize = 0; + hr = GetHandlerPayloadSize(marshalAs, &payloadSize); + if (FAILED(hr)) { + return hr; + } + + *pSize += payloadSize; + return S_OK; +#endif // defined(MOZ_MSCOM_REMARSHAL_NO_HANDLER) +} + +HRESULT +Handler::GetMarshalInterface(REFIID aMarshalAsIid, NotNull<IUnknown*> aProxy, + NotNull<IID*> aOutIid, + NotNull<IUnknown**> aOutUnk) { + *aOutIid = aMarshalAsIid; + return aProxy->QueryInterface( + aMarshalAsIid, + reinterpret_cast<void**>(static_cast<IUnknown**>(aOutUnk))); +} + +HRESULT +Handler::MarshalInterface(IStream* pStm, REFIID riid, void* pv, + DWORD dwDestContext, void* pvDestContext, + DWORD mshlflags) { + // We do not necessarily want to use the pv that COM is giving us; we may want + // to marshal a different proxy that is more appropriate to what we're + // wrapping... + RefPtr<IUnknown> unkToMarshal; + HRESULT hr; + +#if defined(MOZ_MSCOM_REMARSHAL_NO_HANDLER) + LARGE_INTEGER seekTo; + seekTo.QuadPart = 0; + + ULARGE_INTEGER objrefPos; + + // Save the current position as it points to the location where the OBJREF + // will be written. + hr = pStm->Seek(seekTo, STREAM_SEEK_CUR, &objrefPos); + if (FAILED(hr)) { + return hr; + } +#endif // defined(MOZ_MSCOM_REMARSHAL_NO_HANDLER) + + REFIID marshalAs = MarshalAs(riid); + IID marshalOutAs; + + hr = GetMarshalInterface( + marshalAs, WrapNotNull<IUnknown*>(mInnerUnk), WrapNotNull(&marshalOutAs), + WrapNotNull<IUnknown**>(getter_AddRefs(unkToMarshal))); + if (FAILED(hr)) { + return hr; + } + + hr = mUnmarshal->MarshalInterface(pStm, marshalAs, unkToMarshal.get(), + dwDestContext, pvDestContext, mshlflags); + if (FAILED(hr)) { + return hr; + } + +#if defined(MOZ_MSCOM_REMARSHAL_NO_HANDLER) + // Obtain the current stream position which is the end of the OBJREF + ULARGE_INTEGER endPos; + hr = pStm->Seek(seekTo, STREAM_SEEK_CUR, &endPos); + if (FAILED(hr)) { + return hr; + } + + // Now strip out the handler. + if (!StripHandlerFromOBJREF(WrapNotNull(pStm), objrefPos.QuadPart, + endPos.QuadPart)) { + return E_FAIL; + } + + // Fix the IID + if (!SetIID(WrapNotNull(pStm), objrefPos.QuadPart, marshalOutAs)) { + return E_FAIL; + } + + return S_OK; +#else + if (!HasPayload()) { + return S_OK; + } + + // Unfortunately when COM re-marshals a proxy that prevouisly had a payload, + // we must re-serialize it. + return WriteHandlerPayload(pStm, marshalAs); +#endif // defined(MOZ_MSCOM_REMARSHAL_NO_HANDLER) +} + +HRESULT +Handler::UnmarshalInterface(IStream* pStm, REFIID riid, void** ppv) { + REFIID unmarshalAs = MarshalAs(riid); + HRESULT hr = mUnmarshal->UnmarshalInterface(pStm, unmarshalAs, ppv); + if (FAILED(hr)) { + return hr; + } + + // This method may be called on the same object multiple times (as new + // interfaces are queried off the proxy). Not all interfaces will necessarily + // refresh the payload, so we set mHasPayload using OR to reflect that fact. + // (Otherwise mHasPayload could be cleared and the handler would think that + // it doesn't have a payload even though it actually does). + mHasPayload |= (ReadHandlerPayload(pStm, unmarshalAs) == S_OK); + + return hr; +} + +HRESULT +Handler::ReleaseMarshalData(IStream* pStm) { + return mUnmarshal->ReleaseMarshalData(pStm); +} + +HRESULT +Handler::DisconnectObject(DWORD dwReserved) { + return mUnmarshal->DisconnectObject(dwReserved); +} + +HRESULT +Handler::Unregister(REFCLSID aClsid) { return Module::Deregister(aClsid); } + +HRESULT +Handler::Register(REFCLSID aClsid, const bool aMsixContainer) { + return Module::Register(aClsid, Module::ThreadingModel::DedicatedUiThreadOnly, + Module::ClassType::InprocHandler, nullptr, + aMsixContainer); +} + +} // namespace mscom +} // namespace mozilla |