text: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef IPC_IPC_CHANNEL_WIN_H_
  #define IPC_IPC_CHANNEL_WIN_H_
  #pragma once
  
  #include "ipc/ipc_channel.h"
  
  #include <queue>
  #include <string>
  
  #include "base/memory/scoped_ptr.h"
  #include "base/message_loop.h"
  
  namespace base {
  class NonThreadSafe;
  }
  
  namespace IPC {
  
  class Channel::ChannelImpl : public MessageLoopForIO::IOHandler {
   public:
    // Mirror methods of Channel, see ipc_channel.h for description.
    ChannelImpl(const IPC::ChannelHandle &channel_handle, Mode mode,
                Listener* listener);
    ~ChannelImpl();
    bool Connect();
    void Close();
    void set_listener(Listener* listener) { listener_ = listener; }
    bool Send(Message* message);
   private:
    const std::wstring PipeName(const std::string& channel_id) const;
    bool CreatePipe(const IPC::ChannelHandle &channel_handle, Mode mode);
  
    bool ProcessConnection();
    bool ProcessIncomingMessages(MessageLoopForIO::IOContext* context,
                                 DWORD bytes_read);
    bool ProcessOutgoingMessages(MessageLoopForIO::IOContext* context,
                                 DWORD bytes_written);
  
    // MessageLoop::IOHandler implementation.
    virtual void OnIOCompleted(MessageLoopForIO::IOContext* context,
                               DWORD bytes_transfered, DWORD error);
   private:
    struct State {
      explicit State(ChannelImpl* channel);
      ~State();
      MessageLoopForIO::IOContext context;
      bool is_pending;
    };
  
    State input_state_;
    State output_state_;
  
    HANDLE pipe_;
  
    Listener* listener_;
  
    // Messages to be sent are queued here.
    std::queue<Message*> output_queue_;
  
    // We read from the pipe into this buffer
    char input_buf_[Channel::kReadBufferSize];
  
    // Large messages that span multiple pipe buffers, get built-up using
    // this buffer.
    std::string input_overflow_buf_;
  
    // In server-mode, we have to wait for the client to connect before we
    // can begin reading.  We make use of the input_state_ when performing
    // the connect operation in overlapped mode.
    bool waiting_connect_;
  
    // This flag is set when processing incoming messages.  It is used to
    // avoid recursing through ProcessIncomingMessages, which could cause
    // problems.  TODO(darin): make this unnecessary
    bool processing_incoming_;
  
    ScopedRunnableMethodFactory<ChannelImpl> factory_;
  
    scoped_ptr<base::NonThreadSafe> thread_check_;
  
    DISALLOW_COPY_AND_ASSIGN(ChannelImpl);
  };
  
  }  // namespace IPC
  
  #endif  // IPC_IPC_CHANNEL_WIN_H_
  