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117 lines
4.5 KiB
PHP
117 lines
4.5 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Crypt
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* @subpackage Math
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: BigInteger.php 16971 2009-07-22 18:05:45Z mikaelkael $
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*/
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/**
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* Support for arbitrary precision mathematics in PHP.
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*
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* Zend_Crypt_Math_BigInteger is a wrapper across three PHP extensions: bcmath, gmp
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* and big_int. Since each offer similar functionality, but availability of
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* each differs across installations of PHP, this wrapper attempts to select
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* the fastest option available and encapsulate a subset of its functionality
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* which all extensions share in common.
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*
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* This class requires one of the three extensions to be available. BCMATH
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* while the slowest, is available by default under Windows, and under Unix
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* if PHP is compiled with the flag "--enable-bcmath". GMP requires the gmp
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* library from http://www.swox.com/gmp/ and PHP compiled with the "--with-gmp"
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* flag. BIG_INT support is available from a big_int PHP library available from
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* only from PECL (a Windows port is not available).
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*
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* @category Zend
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* @package Zend_Crypt
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Crypt_Math_BigInteger
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{
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/**
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* Holds an instance of one of the three arbitrary precision wrappers.
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*
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* @var Zend_Crypt_Math_BigInteger_Interface
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*/
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protected $_math = null;
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/**
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* Constructor; a Factory which detects a suitable PHP extension for
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* arbitrary precision math and instantiates the suitable wrapper
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* object.
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*
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* @param string $extension
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* @throws Zend_Crypt_Math_BigInteger_Exception
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*/
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public function __construct($extension = null)
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{
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if (!is_null($extension) && !in_array($extension, array('bcmath', 'gmp', 'bigint'))) {
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require_once('Zend/Crypt/Math/BigInteger/Exception.php');
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throw new Zend_Crypt_Math_BigInteger_Exception('Invalid extension type; please use one of bcmath, gmp or bigint');
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}
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$this->_loadAdapter($extension);
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}
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/**
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* Redirect all public method calls to the wrapped extension object.
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*
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* @param string $methodName
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* @param array $args
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* @throws Zend_Crypt_Math_BigInteger_Exception
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*/
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public function __call($methodName, $args)
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{
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if(!method_exists($this->_math, $methodName)) {
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require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
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throw new Zend_Crypt_Math_BigInteger_Exception('invalid method call: ' . get_class($this->_math) . '::' . $methodName . '() does not exist');
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}
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return call_user_func_array(array($this->_math, $methodName), $args);
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}
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/**
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* @param string $extension
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* @throws Zend_Crypt_Math_BigInteger_Exception
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*/
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protected function _loadAdapter($extension = null)
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{
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if (is_null($extension)) {
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if (extension_loaded('gmp')) {
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$extension = 'gmp';
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//} elseif (extension_loaded('big_int')) {
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// $extension = 'big_int';
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} else {
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$extension = 'bcmath';
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}
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}
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if($extension == 'gmp' && extension_loaded('gmp')) {
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require_once 'Zend/Crypt/Math/BigInteger/Gmp.php';
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$this->_math = new Zend_Crypt_Math_BigInteger_Gmp();
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//} elseif($extension == 'bigint' && extension_loaded('big_int')) {
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// require_once 'Zend/Crypt_Math/BigInteger/Bigint.php';
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// $this->_math = new Zend_Crypt_Math_BigInteger_Bigint();
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} elseif ($extension == 'bcmath') {
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require_once 'Zend/Crypt/Math/BigInteger/Bcmath.php';
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$this->_math = new Zend_Crypt_Math_BigInteger_Bcmath();
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} else {
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require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
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throw new Zend_Crypt_Math_BigInteger_Exception($extension . ' big integer precision math support not detected');
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}
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}
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} |