GmpBigIntegerFactory.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: GmpBigIntegerFactory.class.php 4687 2007-12-09 18:57:18Z voxus $ */
00012 
00016     final class GmpBigIntegerFactory extends BigNumberFactory
00017     {
00021         public static function me()
00022         {
00023             return Singleton::getInstance(__CLASS__);
00024         }
00025         
00029         public function makeNumber($number, $base = 10)
00030         {
00031             return GmpBigInteger::make($number, $base);
00032         }
00033         
00037         public function makeFromBinary($binary)
00038         {
00039             return GmpBigInteger::makeFromBinary($binary);
00040         }
00041         
00045         public function makeRandom($stop, RandomSource $source)
00046         {
00047             if (is_string($stop)) {
00048                 $stop = $this->makeNumber($stop);
00049             } elseif (
00050                 $stop instanceof BigInteger
00051                 && !$stop instanceof GmpBigInteger
00052             ) {
00053                 $stop = $this->makeNumber($stop->toString());
00054             }
00055             
00056             Assert::isTrue($stop instanceof GmpBigInteger);
00057             
00058             $numBytes = ceil(log($stop->floatValue(), 2) / 8);
00059             
00060             return $this->
00061                 makeFromBinary("\x00".$source->getBytes($numBytes))->
00062                 mod($stop);
00063         }
00064     }
00065 ?>

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