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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