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// $Id: Rw11VirtTermTcp.hpp 508 2013-04-20 18:43:28Z mueller $

//

// Copyright 2013- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>

//

// This program is free software; you may redistribute and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation, either version 2, or at your option any later version.

//

// This program is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY

// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for complete details.

// 

// Revision History: 

// Date         Rev Version  Comment

// 2013-04-20   508   1.0.1  add fSndPreConQue handling

// 2013-03-06   495   1.0    Initial version

// 2013-02-13   488   0.1    First draft

// ---------------------------------------------------------------------------

/*!

  \file

  \version $Id: Rw11VirtTermTcp.hpp 508 2013-04-20 18:43:28Z mueller $

  \brief   Declaration of class Rw11VirtTermTcp.

*/

#ifndef included_Retro_Rw11VirtTermTcp

#define included_Retro_Rw11VirtTermTcp 1

#include <deque>

#include "Rw11VirtTerm.hpp"

namespace Retro {

  class Rw11VirtTermTcp : public Rw11VirtTerm {

    public:

      explicit      Rw11VirtTermTcp(Rw11Unit* punit);

                   ~Rw11VirtTermTcp();

      bool          Open(const std::string& url, RerrMsg& emsg);

      virtual bool  Snd(const uint8_t* data, size_t count, RerrMsg& emsg);

      virtual void  Dump(std::ostream& os, int ind=0, const char* text=0) const;

    // statistics counter indices

      enum stats {

        kStatNVTPreConSave = Rw11VirtTerm::kDimStat,

        kStatNVTPreConDrop,

        kStatNVTListenPoll,

        kStatNVTAccept,

        kStatNVTRcvRaw,

        kStatNVTSndRaw,

        kDimStat

      };

    protected:

      bool          Connected() const;

      int           ListenPollHandler(const pollfd& pfd);

      int           RcvPollHandler(const pollfd& pfd);

    // some constants (also defined in cpp)

      static const uint8_t  kCode_NULL =   0;

      static const uint8_t  kCode_LF   =  10;

      static const uint8_t  kCode_CR   =  13;

      static const uint8_t  kCode_ESC  =  27;

      static const uint8_t  kCode_SE   = 240;

      static const uint8_t  kCode_NOP  = 241;

      static const uint8_t  kCode_IP   = 244;

      static const uint8_t  kCode_GA   = 249;

      static const uint8_t  kCode_SB   = 250;

      static const uint8_t  kCode_WILL = 251;

      static const uint8_t  kCode_WONT = 252;

      static const uint8_t  kCode_DO   = 253;

      static const uint8_t  kCode_DONT = 254;

      static const uint8_t  kCode_IAC  = 255;

      static const uint8_t  kOpt_BIN   =   0;

      static const uint8_t  kOpt_ECHO  =   1;

      static const uint8_t  kOpt_SGA   =   3;

      static const uint8_t  kOpt_TTYP  =  24;

      static const uint8_t  kOpt_LINE  =  34;

      static const size_t   kPreConQue_limit = 65536;

      enum telnet_state {

        ts_Closed = 0,

        ts_Listen,

        ts_Stream,

        ts_Iac,

        ts_Cmd,

        ts_Subneg,

        ts_Subiac

      };

    protected:

      int           fFdListen;

      int           fFd;

      telnet_state  fState;

      bool          fTcpTrace;

      std::deque<uint8_t> fSndPreConQue;

  };

} // end namespace Retro

#include "Rw11VirtTermTcp.ipp"

#endif