StreamFilter.h

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/*
 * Deskflow -- mouse and keyboard sharing utility
 * SPDX-FileCopyrightText: (C) 2025 Deskflow Developers
 * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
 * SPDX-FileCopyrightText: (C) 2004 Chris Schoeneman
 * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
 */
 
#pragma once
 
#include "base/IEventQueue.h"
#include "io/IStream.h"


class StreamFilter : public deskflow::IStream
{
public:
  StreamFilter(IEventQueue *events, deskflow::IStream *stream, bool adoptStream = true);
  StreamFilter(StreamFilter const &) = delete;
  StreamFilter(StreamFilter &&) = delete;
  ~StreamFilter() override;
 
  StreamFilter &operator=(StreamFilter const &) = delete;
  StreamFilter &operator=(StreamFilter &&) = delete;
 
  // IStream overrides
  // These all just forward to the underlying stream except getEventTarget.
  // Override as necessary.  getEventTarget returns a pointer to this.
  void close() override;
  uint32_t read(void *buffer, uint32_t n) override;
  void write(const void *buffer, uint32_t n) override;
  void flush() override;
  void shutdownInput() override;
  void shutdownOutput() override;
  void *getEventTarget() const override;
  bool isReady() const override;
  uint32_t getSize() const override;


  deskflow::IStream *getStream() const;
 
protected:

  virtual void filterEvent(const Event &);
 
private:
  deskflow::IStream *m_stream;
  bool m_adopted;
  IEventQueue *m_events;
};