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// $Id: Rw11VirtTapeTap.hpp 686 2015-06-04 21:08:08Z mueller $

//

// Copyright 2015- 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

// 2015-06-04   686   1.0    Initial version

// 2015-05-17   683   0.1    First draft

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

/*!

  \file

  \version $Id: Rw11VirtTapeTap.hpp 686 2015-06-04 21:08:08Z mueller $

  \brief   Declaration of class Rw11VirtTapeTap.

*/

#ifndef included_Retro_Rw11VirtTapeTap

#define included_Retro_Rw11VirtTapeTap 1

#include "Rw11VirtTape.hpp"

namespace Retro {

  class Rw11VirtTapeTap : public Rw11VirtTape {

    public:

      explicit      Rw11VirtTapeTap(Rw11Unit* punit);

                   ~Rw11VirtTapeTap();

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

      virtual bool  ReadRecord(size_t nbyt, uint8_t* data, size_t& ndone,

                               int& opcode, RerrMsg& emsg);

      virtual bool  WriteRecord(size_t nbyt, const uint8_t* data,

                                int& opcode, RerrMsg& emsg);

      virtual bool  WriteEof(RerrMsg& emsg);

      virtual bool  SpaceForw(size_t nrec, size_t& ndone,

                              int& opcode, RerrMsg& emsg);

      virtual bool  SpaceBack(size_t nrec, size_t& ndone,

                              int& opcode, RerrMsg& emsg);

      virtual bool  Rewind(int& opcode, RerrMsg& emsg);

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

    // some constants (also defined in cpp)

      static const uint32_t kMetaEof = 0x00000000; //!< EOF marker

      static const uint32_t kMetaEom = 0xffffffff; //!< EOM marker

      static const uint32_t kMeta_M_Perr = 0x80000000;

      static const uint32_t kMeta_M_Mbz  = 0x7fff0000;

      static const uint32_t kMeta_B_Rlen = 0x0000ffff;

    protected:

      bool          Seek(size_t seekpos, int dir, RerrMsg& emsg);

      bool          Read(size_t nbyt, uint8_t* data, RerrMsg& emsg);

      bool          Write(size_t nbyt, const uint8_t* data, bool back,

                          RerrMsg& emsg);

      bool          CheckSizeForw(size_t nbyt, const char* text, RerrMsg& emsg);

      bool          CheckSizeBack(size_t nbyt, const char* text, RerrMsg& emsg);

      void          UpdatePos(size_t nbyt, int dir);

      bool          ParseMeta(uint32_t meta, size_t& rlen, bool& perr,

                              RerrMsg& emsg);

      size_t        BytePadding(size_t rlen);

      bool          SetBad();

      bool          BadTapeMsg(const char* meth, RerrMsg& emsg);

      void          IncPosRecord(int delta);

    protected:

      int           fFd;                    //!< file number

      size_t        fSize;                  //!< file size

      size_t        fPos;                   //!< file position

      bool          fBad;                   //!< BAD file format flag

      bool          fPadOdd;                //!< do odd byte padding

      bool          fTruncPend;             //!< truncate on next write

  };

} // end namespace Retro

#include "Rw11VirtTapeTap.ipp"

#endif