FileRandomSource.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2007 by Anton E. Lebedevich                             *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00015     final class FileRandomSource implements RandomSource
00016     {
00017         private $handle = null;
00018         
00019         public function __construct($filename)
00020         {
00021             Assert::isTrue(file_exists($filename) && is_readable($filename));
00022             
00023             $this->handle = fopen($filename, 'rb');
00024         }
00025         
00026         public function __destruct()
00027         {
00028             fclose($this->handle);
00029         }
00030         
00031         public function getBytes($numberOfBytes)
00032         {
00033             Assert::isPositiveInteger($numberOfBytes);
00034             
00035             return fread($this->handle, $numberOfBytes);
00036         }
00037     }
00038 ?>