text: /* Ricochet - https://ricochet.im/
   * Copyright (C) 2014, John Brooks <john.brooks@dereferenced.net>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *    * Redistributions of source code must retain the above copyright
   *      notice, this list of conditions and the following disclaimer.
   *
   *    * Redistributions in binary form must reproduce the above
   *      copyright notice, this list of conditions and the following disclaimer
   *      in the documentation and/or other materials provided with the
   *      distribution.
   *
   *    * Neither the names of the copyright owners nor the names of its
   *      contributors may be used to endorse or promote products derived from
   *      this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef PROTOCOL_CONNECTION_P_H
  #define PROTOCOL_CONNECTION_P_H
  
  #include "Connection.h"
  #include <QMap>
  #include <QElapsedTimer>
  #include <cstdint>
  
  namespace Protocol
  {
  
  class ConnectionPrivate : public QObject
  {
      Q_OBJECT
      Q_DISABLE_COPY(ConnectionPrivate)
  
  public:
      static const quint8 ProtocolVersion = 1;
      static const quint8 ProtocolVersionFailed = 0xff;
      static const int PacketHeaderSize = 4;
      static const int PacketMaxDataSize = UINT16_MAX - PacketHeaderSize;
      // Time in seconds before a connection with a purpose of Unknown is killed
      static const int UnknownPurposeTimeout = 15;
  
      explicit ConnectionPrivate(Connection *q);
      virtual ~ConnectionPrivate();
  
      Connection *q;
      QTcpSocket *socket;
      QHash<int,Channel*> channels;
      QMap<Connection::AuthenticationType,QString> authentication;
      QElapsedTimer ageTimer;
      Connection::Direction direction;
      Connection::Purpose purpose;
      bool wasClosed;
      bool handshakeDone;
  
      void setSocket(QTcpSocket *socket, Connection::Direction direction);
  
      int availableOutboundChannelId();
      bool isValidAvailableChannelId(int channelId, Connection::Direction idDirection);
  
      bool insertChannel(Channel *channel);
      void removeChannel(Channel *channel);
  
      void closeAllChannels();
  
      bool writePacket(Channel *channel, const QByteArray &data);
      bool writePacket(int channelId, const QByteArray &data);
  
  public slots:
      void closeImmediately();
  
  private slots:
      void socketReadable();
      void socketDisconnected();
  
  private:
      int nextOutboundChannelId;
  };
  
  }
  
  #endif
  