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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/. */
#ifndef mozilla_mscom_ProxyStream_h
#define mozilla_mscom_ProxyStream_h
#include "ipc/IPCMessageUtils.h"
#include "mozilla/mscom/Ptr.h"
#include "mozilla/RefPtr.h"
#include "mozilla/TypedEnumBits.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
namespace mscom {
enum class ProxyStreamFlags : uint32_t {
eDefault = 0,
// When ePreservable is set on a ProxyStream, its caller *must* call
// GetPreservableStream() before the ProxyStream is destroyed.
ePreservable = 1
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ProxyStreamFlags);
class ProxyStream final {
public:
class MOZ_RAII Environment {
public:
virtual ~Environment() = default;
virtual bool Push() = 0;
virtual bool Pop() = 0;
};
class MOZ_RAII DefaultEnvironment : public Environment {
public:
bool Push() override { return true; }
bool Pop() override { return true; }
};
ProxyStream();
ProxyStream(REFIID aIID, IUnknown* aObject, Environment* aEnv,
ProxyStreamFlags aFlags = ProxyStreamFlags::eDefault);
ProxyStream(REFIID aIID, const BYTE* aInitBuf, const int aInitBufSize,
Environment* aEnv);
~ProxyStream();
// Not copyable because this would mess up the COM marshaling.
ProxyStream(const ProxyStream& aOther) = delete;
ProxyStream& operator=(const ProxyStream& aOther) = delete;
ProxyStream(ProxyStream&& aOther);
ProxyStream& operator=(ProxyStream&& aOther);
inline bool IsValid() const { return !(mUnmarshaledProxy && mStream); }
bool GetInterface(void** aOutInterface);
const BYTE* GetBuffer(int& aReturnedBufSize) const;
PreservedStreamPtr GetPreservedStream();
bool operator==(const ProxyStream& aOther) const { return this == &aOther; }
private:
RefPtr<IStream> mStream;
BYTE* mGlobalLockedBuf;
HGLOBAL mHGlobal;
int mBufSize;
ProxyUniquePtr<IUnknown> mUnmarshaledProxy;
bool mPreserveStream;
};
namespace detail {
template <typename Interface>
struct EnvironmentSelector {
typedef ProxyStream::DefaultEnvironment Type;
};
} // namespace detail
} // namespace mscom
} // namespace mozilla
#endif // mozilla_mscom_ProxyStream_h
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