# 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 ?>