src/FileIO.h

/*  -*- C++ -*-

    textIR - A fast text document retrieval engine

    Copyright (C) 2005-2009 Laurence Park

    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 3 of the License, 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 more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    File information:
    $Header: /home/staff/lapark/cvsroot/web_search/textIR/src/FileIO.h,v 1.5 2009/10/08 06:41:30 lapark Exp $
*/

#ifndef FILEIO_H
#define FILEIO_H

#include "localdef.h"
#include <fstream>

class FileIO {
public:

  FileIO(const char *filename); 

  FileIO(const char *filename, std::ios::openmode mode); 

  ~FileIO(void);

  void open(std::ios::openmode mode); 

  void close(void); 

  FILE_POS_TYPE fileSize(void); 

  void readBlock(char *buffer, int blockSize); 

  void writeBlock(char *buffer, int blockSize); 

  FILE_POS_TYPE repositionRead(FILE_POS_TYPE filePos);

  FILE_POS_TYPE repositionWrite(FILE_POS_TYPE filePos); 

  void truncateFile(FILE_POS_TYPE fileSize); 
private:
  std::fstream *_file; 
  char *_fileName; 
};

#endif

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