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/* $Id: reader.hpp,v 1.6 2006/11/05 04:42:43 ganzhorn Exp $
* This file is part of lfhex.
* Copyright (C) 2006 Salem Ganzhorn <eyekode@yahoo.com>
*
* 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 version 2.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef _READER_H_
#define _READER_H_
//
// Interface for Reader object.
//
// Reader object supports:
// open(const QString& filename ); -> open a file for reading
// bool is_open(); -> see if file is open
// close(); -> free resources for open file.
// int read( vector<uchar>& v, int maxSize ) -> fill v with maxSize data from
// open file.
// off_t seek( off_t offset ); -> move file pointer to offset offset.
//
#include <sys/types.h>
#include <stdio.h>
#include <vector>
#include <string>
#include <iostream>
#include "local.h"
typedef vector<uchar> ReadBuffer;
#ifdef __GNUC__
ostream& operator<< (ostream&out,const ReadBuffer& buff);
#endif
class Reader {
public:
// default is only 50*4k = 200k memory image.
Reader(const string& filename = "",off_t npages = 50, off_t pageSize = 4096);
~Reader();
bool open(const string& filename);
bool close();
bool eof();
bool is_open() const;
size_t read( ReadBuffer& v, size_t numBytes );
off_t seek( off_t offset );
off_t tell() const; // returns the current offset or -1 if !open
off_t size() const;
const char* lastError() const;
const char* filename() const;
uchar operator[] (off_t offset); // cannot be const because it does change
// data by loading/swapping pages
off_t findIndex( off_t start, const vector<uchar>& data,
off_t stop );
off_t rFindIndex( off_t start, const vector<uchar>& data,
off_t stop );
protected:
bool dataIsAtOffset( const vector<uchar>& data, off_t pos );
bool loadPage(off_t pageIdx);
bool freePage(off_t pageIdx);
off_t nFreePages() const;
off_t& nFreePages();
protected:
string _error;
FILE* _fptr;
bool _is_open;
bool _eof;
string _filename;
off_t _offset; // current offset
off_t _size; // file size from fstat
off_t _pageSize; // number of bytes in a page
off_t _firstPage; // first currently loaded page
off_t _lastPage; // last currently loaded page
off_t _maxPages; // maximum number of pages which could be currently loaded
off_t _freePages; // number of free pages
vector< uchar *> _data;
};
#endif
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