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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