huge_file.h

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#ifndef HUGE_FILE_CLASS
#define HUGE_FILE_CLASS

/*****************************************************************************\
*                                                                             *
*  Name   : huge_file                                                         *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 2007-$now By Author.  This program is free software; you can  *
* redistribute it and/or modify it under the terms of the GNU General Public  *
* License as published by the Free Software Foundation; either version 2 of   *
* the License or (at your option) any later version.  This is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/


#include "byte_filer.h"

#include <basis/object_base.h>
#include <basis/outcome.h>

class OPSYSTEM_CLASS_STYLE huge_file
{
public:
  huge_file(const istring &filename, const istring &permissions);

  virtual ~huge_file();

  IMPLEMENT_CLASS_NAME("huge_file");

  enum outcomes {
    OKAY = common::OKAY,
    FAILURE = common::FAILURE,
    ACCESS_DENIED = common::ACCESS_DENIED,
    BAD_INPUT = common::BAD_INPUT
  };

  bool good() const;

  bool eof() const;

  double length();

  double file_pointer() const { return _file_pointer; }

  outcome seek(double new_position,
          byte_filer::origins origin = byte_filer::FROM_CURRENT);

  outcome move_to(double absolute_posn);

  outcome read(byte_array &to_fill, int desired_size, int &size_read);

  outcome write(const byte_array &to_write, int &size_written);

  bool truncate();

  void flush();

private:
  byte_filer *_real_file;  
  double _file_pointer;  
};


#endif

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