TapeReader.hpp

/* TapeReader.hpp */
/* $Id: TapeReader.hpp,v 1.2 2008/11/27 13:07:51 vlad Exp $ */
#ifndef __TapeReader_hpp
#define __TapeReader_hpp


#define TapeReaderBlockSize 65536


class TapeReader
{
public:

  enum ReadStatus {
    Normal, 
    EndOfBlock, 
    EndOfFile,  
    EndOfTape,  
    ReadError   
  };


  TapeReader (const char* szPath, int nSize = TapeReaderBlockSize);

  virtual ~TapeReader ();

  int       read (ReadStatus& status, void* buffer, int req_size = 0);

  void      undo_read (void* buffer, int undo_size);
  

  void      set_block_mode (bool bFlag);
  
  bool      get_block_mode () const;


  int       get_max_block_size () const;


  void      set_max_errors (int nErrors);

  int       get_max_errors () const;


  bool      is_tape () const;

protected:

  static int    open (const char* szPath, bool& bTape);

  int       read (void* buf, int req_size);

  int       fdTape;

  bool      bBlockMode;

  bool      bTapeDevice;

  ReadStatus    ePrevStatus;

  int       nMaxBlockSize;

  int       nMaxErrors;

  char      *pBlockBuffer;

  int       nDataOffset;

  int       nDataSize;

};


#endif /* TapeReader.hpp */