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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_Gmp 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_Gmp implements Zend_Crypt_Math_BigInteger_Interface
 {
 
     /**
      * Initialise a big integer into an extension specific type.
      * @param string $operand
      * @param int $base
      * @return string
      */
     public function init($operand, $base = 10)
     {
         return $operand;
     }
 
     /**
      * Adds two arbitrary precision numbers
      *
      * @param resource $left_operand
      * @param resource $right_operand
      * @return string
      */
     public function add($left_operand, $right_operand)
     {
         $result = gmp_add($left_operand, $right_operand);
         return gmp_strval($result);
     }
 
     /**
      * Subtract numbers
      *
      * @param resource $left_operand
      * @param resource $right_operand
      * @return string
      */
     public function subtract($left_operand, $right_operand)
     {
         $result = gmp_sub($left_operand, $right_operand);
         return gmp_strval($result);
     }
 
     /**
      * 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 resource $left_operand
      * @param resource $right_operand
      * @return int
      */
     public function compare($left_operand, $right_operand)
     {
         $result = gmp_cmp($left_operand, $right_operand);
         return gmp_strval($result);
     }
 
     /**
      * Divide two big integers and return result or NULL if the denominator
      * is zero.
      *
      * @param resource $left_operand
      * @param resource $right_operand
      * @return string|null
      */
     public function divide($left_operand, $right_operand)
     {
         $result = gmp_div($left_operand, $right_operand);
         return gmp_strval($result);
     }
 
     /**
      * Modulo operation
      *
      * @param resource $left_operand
      * @param resource $modulus
      * @internal param string $right_operand
      * @return string
      */
     public function modulus($left_operand, $modulus)
     {
         $result = gmp_mod($left_operand, $modulus);
         return gmp_strval($result);
     }
 
     /**
      * Multiply numbers
      *
      * @param resource $left_operand
      * @param resource $right_operand
      * @return string
      */
     public function multiply($left_operand, $right_operand)
     {
         $result = gmp_mul($left_operand, $right_operand);
         return gmp_strval($result);
     }
 
     /**
      * Raise number into power
      *
      * @param resource $left_operand
      * @param int      $right_operand
      * @return string
      */
     public function pow($left_operand, $right_operand)
     {
         $result = gmp_pow($left_operand, $right_operand);
         return gmp_strval($result);
     }
 
     /**
      * Raise number into power with modulo
      *
      * @param resource $left_operand
      * @param resource $right_operand
      * @param resource $modulus
      * @return string
      */
     public function powmod($left_operand, $right_operand, $modulus)
     {
         $result = gmp_powm($left_operand, $right_operand, $modulus);
         return gmp_strval($result);
     }
 
     /**
      * Calculate square root
      *
      * @param $operand
      * @return string
      */
     public function sqrt($operand)
     {
         $result = gmp_sqrt($operand);
         return gmp_strval($result);
     }
 
     /**
      * @param string $operand
      * @return string
      */
     public function binaryToInteger($operand)
     {
         $result = '0';
         while (strlen($operand)) {
             $ord = ord(substr($operand, 0, 1));
             $result = gmp_add(gmp_mul($result, 256), $ord);
             $operand = substr($operand, 1);
         }
         return gmp_strval($result);
     }
 
     /**
      * @param resource $operand GMP number resource
      * @return string
      */
     public function integerToBinary($operand)
     {
         $bigInt = gmp_strval($operand, 16);
         if (strlen($bigInt) % 2 != 0) {
             $bigInt = '0' . $bigInt;
         } else if ($bigInt[0] > '7') {
             $bigInt = '00' . $bigInt;
         }
         $return = pack("H*", $bigInt);
         return $return;
     }
 
     /**
      * @param string $operand
      * @return string
      */
     public function hexToDecimal($operand)
     {
         $return = '0';
         while(strlen($hex)) {
             $hex = hexdec(substr($operand, 0, 4));
             $dec = gmp_add(gmp_mul($return, 65536), $hex);
             $operand = substr($operand, 4);
         }
         return $return;
     }
 
 }