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ReadBuffer.hpp

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/*==========================================================================
 * Copyright (c) 2003 University of Massachusetts.  All Rights Reserved.
 *
 * Use of the Lemur Toolkit for Language Modeling and Information Retrieval
 * is subject to the terms of the software license set forth in the LICENSE
 * file included with this software, and also available at
 * http://www.cs.cmu.edu/~lemur/license.html
 *
 *==========================================================================
*/


//
// ReadBuffer
//
// tds - 13 November 2003
//

#ifndef LEMUR_READBUFFER_HPP
#define LEMUR_READBUFFER_HPP

#include "File.hpp"

class ReadBuffer {
private:
  File::offset_type _filePosition;
  char* _buffer;
  File& _file;
  int _bufferSize;
  int _bufferPosition;
  int _bufferDataLength;
  bool _gValid;

public:
  ReadBuffer( File& file, int bufferSize );
  ~ReadBuffer();

  void read( char* data, int length );

  const char* peek( int length );

  const char* read( int length );

  void seekg( File::offset_type position, std::fstream::seekdir direction );

  File::offset_type tellg();

  int rdstate();

  void invalidateg();
};

#endif // LEMUR_READBUFFER_HPP

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