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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Crypt
  * @subpackage Math
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * Support for arbitrary precision mathematics in PHP.
  *
  * Zend_Crypt_Math_BigInteger is a wrapper across three PHP extensions: bcmath, gmp
  * and big_int. Since each offer similar functionality, but availability of
  * each differs across installations of PHP, this wrapper attempts to select
  * the fastest option available and encapsulate a subset of its functionality
  * which all extensions share in common.
  *
  * This class requires one of the three extensions to be available. BCMATH
  * while the slowest, is available by default under Windows, and under Unix
  * if PHP is compiled with the flag "--enable-bcmath". GMP requires the gmp
  * library from http://www.swox.com/gmp/ and PHP compiled with the "--with-gmp"
  * flag. BIG_INT support is available from a big_int PHP library available from
  * only from PECL (a Windows port is not available).
  *
  * @category   Zend
  * @package    Zend_Crypt
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Crypt_Math_BigInteger
 {
 
     /**
      * Holds an instance of one of the three arbitrary precision wrappers.
      *
      * @var Zend_Crypt_Math_BigInteger_Interface
      */
     protected $_math = null;
 
     /**
      * Constructor; a Factory which detects a suitable PHP extension for
      * arbitrary precision math and instantiates the suitable wrapper
      * object.
      *
      * @param string $extension
      * @throws  Zend_Crypt_Math_BigInteger_Exception
      */
     public function __construct($extension = null)
     {
         if ($extension !== null && !in_array($extension, array('bcmath', 'gmp', 'bigint'))) {
             // require_once('Zend/Crypt/Math/BigInteger/Exception.php');
             throw new Zend_Crypt_Math_BigInteger_Exception('Invalid extension type; please use one of bcmath, gmp or bigint');
         }
         $this->_loadAdapter($extension);
     }
 
     /**
      * Redirect all public method calls to the wrapped extension object.
      *
      * @param  string $methodName
      * @param  array  $args
      * @return mixed
      * @throws Zend_Crypt_Math_BigInteger_Exception
      */
     public function __call($methodName, $args)
     {
         if(!method_exists($this->_math, $methodName)) {
             // require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
             throw new Zend_Crypt_Math_BigInteger_Exception('invalid method call: ' . get_class($this->_math) . '::' . $methodName . '() does not exist');
         }
         return call_user_func_array(array($this->_math, $methodName), $args);
     }
 
     /**
      * @param string $extension
      * @throws  Zend_Crypt_Math_BigInteger_Exception
      */
     protected function _loadAdapter($extension = null)
     {
         if ($extension === null) {
             if (extension_loaded('gmp')) {
                 $extension = 'gmp';
             //} elseif (extension_loaded('big_int')) {
             //    $extension = 'big_int';
             } else {
                 $extension = 'bcmath';
             }
         }
         if($extension == 'gmp' && extension_loaded('gmp')) {
             // require_once 'Zend/Crypt/Math/BigInteger/Gmp.php';
             $this->_math = new Zend_Crypt_Math_BigInteger_Gmp();
         //} elseif($extension == 'bigint' && extension_loaded('big_int')) {
         //    // require_once 'Zend/Crypt_Math/BigInteger/Bigint.php';
         //    $this->_math = new Zend_Crypt_Math_BigInteger_Bigint();
         } elseif ($extension == 'bcmath' && extension_loaded('bcmath')) {
             // require_once 'Zend/Crypt/Math/BigInteger/Bcmath.php';
             $this->_math = new Zend_Crypt_Math_BigInteger_Bcmath();
         } else {
             // require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
             throw new Zend_Crypt_Math_BigInteger_Exception($extension . ' big integer precision math support not detected');
         }
     }
 
 }