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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    $Id$
  */
 
 /**
  * @see Zend_Crypt_Math_BigInteger_Interface
  */
 // require_once 'Zend/Crypt/Math/BigInteger/Interface.php';
 
 /**
  * Support for arbitrary precision mathematics in PHP.
  *
  * Zend_Crypt_Math_BigInteger_Bcmath is a wrapper across the PHP BCMath
  * extension.
  *
  * @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_Bcmath implements Zend_Crypt_Math_BigInteger_Interface
 {
 
     /**
      * Initialise a big integer into an extension specific type. This is not
      * applicable to BCMath.
      *
      * @param string $operand
      * @param int $base
      * @return string
      */
     public function init($operand, $base = 10)
     {
         return $operand;
     }
 
     /**
      * Adds two arbitrary precision numbers
      *
      * @param string $left_operand
      * @param string $right_operand
      * @return string
      */
     public function add($left_operand, $right_operand)
     {
         return bcadd($left_operand, $right_operand);
     }
 
     /**
      * Subtract one arbitrary precision number from another
      *
      * @param string $left_operand
      * @param string $right_operand
      * @return string
      */
     public function subtract($left_operand, $right_operand)
     {
         return bcsub($left_operand, $right_operand);
     }
 
     /**
      * Compare two big integers and returns result as an integer where 0 means
      * both are identical, 1 that left_operand is larger, or -1 that
      * right_operand is larger.
      *
      * @param string $left_operand
      * @param string $right_operand
      * @return int
      */
     public function compare($left_operand, $right_operand)
     {
         return bccomp($left_operand, $right_operand);
     }
 
     /**
      * Divide two big integers and return result or NULL if the denominator
      * is zero.
      *
      * @param string $left_operand
      * @param string $right_operand
      * @return string|null
      */
     public function divide($left_operand, $right_operand)
     {
         return bcdiv($left_operand, $right_operand);
     }
 
     /**
      * Get modulus of an arbitrary precision number
      *
      * @param string $left_operand
      * @param string $modulus
      * @return string
      */
     public function modulus($left_operand, $modulus)
     {
         return bcmod($left_operand, $modulus);
     }
 
     /**
      * Multiply two arbitrary precision numbers
      *
      * @param string $left_operand
      * @param string $right_operand
      * @return string
      */
     public function multiply($left_operand, $right_operand)
     {
         return bcmul($left_operand, $right_operand);
     }
 
     /**
      * Raise an arbitrary precision number to another
      *
      * @param string $left_operand
      * @param string $right_operand
      * @return string
      */
     public function pow($left_operand, $right_operand)
     {
         return bcpow($left_operand, $right_operand);
     }
 
     /**
      * Raise an arbitrary precision number to another, reduced by a specified
      * modulus
      *
      * @param string $left_operand
      * @param string $right_operand
      * @param string $modulus
      * @return string
      */
     public function powmod($left_operand, $right_operand, $modulus)
     {
         return bcpowmod($left_operand, $right_operand, $modulus);
     }
 
     /**
      * Get the square root of an arbitrary precision number
      *
      * @param string $operand
      * @return string
      */
     public function sqrt($operand)
     {
         return bcsqrt($operand);
     }
 
     /**
      * @param string $operand
      * @return string
      */
     public function binaryToInteger($operand)
     {
         $result = '0';
         while (strlen($operand)) {
             $ord = ord(substr($operand, 0, 1));
             $result = bcadd(bcmul($result, 256), $ord);
             $operand = substr($operand, 1);
         }
         return $result;
     }
 
     /**
      * @param string $operand
      * @return string
      */
     public function integerToBinary($operand)
     {
         $cmp = bccomp($operand, 0);
         $return = '';
         if ($cmp == 0) {
             return "\0";
         }
         while (bccomp($operand, 0) > 0) {
             $return = chr(bcmod($operand, 256)) . $return;
             $operand = bcdiv($operand, 256);
         }
         if (ord($return[0]) > 127) {
             $return = "\0" . $return;
         }
         return $return;
     }
 
     /**public function integerToBinary($operand)
     {
         $return = '';
         while(bccomp($operand, '0')) {
             $return .= chr(bcmod($operand, '256'));
             $operand = bcdiv($operand, '256');
         }
         return $return;
     }**/ // Prior version for referenced offset
 
     /**
      * @param string $operand
      * @return string
      */
     public function hexToDecimal($operand)
     {
         $return = '0';
         while(strlen($hex)) {
             $hex = hexdec(substr($operand, 0, 4));
             $dec = bcadd(bcmul($return, 65536), $hex);
             $operand = substr($operand, 4);
         }
         return $return;
     }
 }