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// $Id: Rw11VirtTapeTap.hpp 686 2015-06-04 21:08:08Z mueller $
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//
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// Copyright 2015- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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//
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// This program is free software; you may redistribute and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 2, or at your option any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for complete details.
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//
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// Revision History:
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// Date Rev Version Comment
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// 2015-06-04 686 1.0 Initial version
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// 2015-05-17 683 0.1 First draft
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// ---------------------------------------------------------------------------
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/*!
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\file
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\version $Id: Rw11VirtTapeTap.hpp 686 2015-06-04 21:08:08Z mueller $
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\brief Declaration of class Rw11VirtTapeTap.
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*/
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#ifndef included_Retro_Rw11VirtTapeTap
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#define included_Retro_Rw11VirtTapeTap 1
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#include "Rw11VirtTape.hpp"
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namespace Retro {
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class Rw11VirtTapeTap : public Rw11VirtTape {
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public:
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explicit Rw11VirtTapeTap(Rw11Unit* punit);
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~Rw11VirtTapeTap();
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bool Open(const std::string& url, RerrMsg& emsg);
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virtual bool ReadRecord(size_t nbyt, uint8_t* data, size_t& ndone,
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int& opcode, RerrMsg& emsg);
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virtual bool WriteRecord(size_t nbyt, const uint8_t* data,
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int& opcode, RerrMsg& emsg);
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virtual bool WriteEof(RerrMsg& emsg);
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virtual bool SpaceForw(size_t nrec, size_t& ndone,
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int& opcode, RerrMsg& emsg);
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virtual bool SpaceBack(size_t nrec, size_t& ndone,
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int& opcode, RerrMsg& emsg);
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virtual bool Rewind(int& opcode, RerrMsg& emsg);
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virtual void Dump(std::ostream& os, int ind=0, const char* text=0) const;
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// some constants (also defined in cpp)
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static const uint32_t kMetaEof = 0x00000000; //!< EOF marker
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static const uint32_t kMetaEom = 0xffffffff; //!< EOM marker
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static const uint32_t kMeta_M_Perr = 0x80000000;
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static const uint32_t kMeta_M_Mbz = 0x7fff0000;
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static const uint32_t kMeta_B_Rlen = 0x0000ffff;
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protected:
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bool Seek(size_t seekpos, int dir, RerrMsg& emsg);
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bool Read(size_t nbyt, uint8_t* data, RerrMsg& emsg);
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bool Write(size_t nbyt, const uint8_t* data, bool back,
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RerrMsg& emsg);
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bool CheckSizeForw(size_t nbyt, const char* text, RerrMsg& emsg);
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bool CheckSizeBack(size_t nbyt, const char* text, RerrMsg& emsg);
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void UpdatePos(size_t nbyt, int dir);
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bool ParseMeta(uint32_t meta, size_t& rlen, bool& perr,
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RerrMsg& emsg);
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size_t BytePadding(size_t rlen);
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bool SetBad();
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bool BadTapeMsg(const char* meth, RerrMsg& emsg);
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void IncPosRecord(int delta);
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protected:
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int fFd; //!< file number
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size_t fSize; //!< file size
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size_t fPos; //!< file position
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bool fBad; //!< BAD file format flag
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bool fPadOdd; //!< do odd byte padding
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bool fTruncPend; //!< truncate on next write
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};
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} // end namespace Retro
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#include "Rw11VirtTapeTap.ipp"
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#endif
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