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 /* $Id: FileRandomSource.class.php 4687 2007-12-09 18:57:18Z voxus $ */
00012 
00016     final class FileRandomSource implements RandomSource
00017     {
00018         private $handle = null;
00019         
00020         public function __construct($filename)
00021         {
00022             Assert::isTrue(file_exists($filename) && is_readable($filename));
00023             
00024             $this->handle = fopen($filename, 'rb');
00025         }
00026         
00027         public function __destruct()
00028         {
00029             fclose($this->handle);
00030         }
00031         
00032         public function getBytes($numberOfBytes)
00033         {
00034             Assert::isPositiveInteger($numberOfBytes);
00035             
00036             return fread($this->handle, $numberOfBytes);
00037         }
00038     }
00039 ?>

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