134 lines
2.9 KiB
PHP
134 lines
2.9 KiB
PHP
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<?php
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/*
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* This file is part of the PHPASN1 library.
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace FG\Utility;
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/**
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* Class BigIntegerGmp
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* Integer representation of big numbers using the GMP extension to perform operations.
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* @package FG\Utility
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* @internal
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*/
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class BigIntegerGmp extends BigInteger
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{
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/**
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* Resource handle.
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* @var \GMP
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*/
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protected $_rh;
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public function __clone()
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{
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$this->_rh = gmp_add($this->_rh, 0);
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}
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protected function _fromString($str)
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{
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$this->_rh = gmp_init($str, 10);
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}
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protected function _fromInteger($integer)
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{
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$this->_rh = gmp_init($integer, 10);
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}
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public function __toString()
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{
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return gmp_strval($this->_rh, 10);
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}
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public function toInteger()
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{
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if ($this->compare(PHP_INT_MAX) > 0 || $this->compare(PHP_INT_MIN) < 0) {
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throw new \OverflowException(sprintf('Can not represent %s as integer.', $this));
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}
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return gmp_intval($this->_rh);
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}
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public function isNegative()
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{
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return gmp_sign($this->_rh) === -1;
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}
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protected function _unwrap($number)
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{
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if ($number instanceof self) {
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return $number->_rh;
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}
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return $number;
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}
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public function compare($number)
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{
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return gmp_cmp($this->_rh, $this->_unwrap($number));
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}
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public function add($b)
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{
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$ret = new self();
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$ret->_rh = gmp_add($this->_rh, $this->_unwrap($b));
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return $ret;
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}
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public function subtract($b)
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{
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$ret = new self();
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$ret->_rh = gmp_sub($this->_rh, $this->_unwrap($b));
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return $ret;
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}
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public function multiply($b)
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{
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$ret = new self();
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$ret->_rh = gmp_mul($this->_rh, $this->_unwrap($b));
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return $ret;
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}
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public function modulus($b)
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{
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$ret = new self();
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$ret->_rh = gmp_mod($this->_rh, $this->_unwrap($b));
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return $ret;
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}
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public function toPower($b)
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{
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if ($b instanceof self) {
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// gmp_pow accepts just an integer
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if ($b->compare(PHP_INT_MAX) > 0) {
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throw new \UnexpectedValueException('Unable to raise to power greater than PHP_INT_MAX.');
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}
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$b = gmp_intval($b->_rh);
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}
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$ret = new self();
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$ret->_rh = gmp_pow($this->_rh, $b);
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return $ret;
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}
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public function shiftRight($bits=8)
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{
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$ret = new self();
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$ret->_rh = gmp_div($this->_rh, gmp_pow(2, $bits));
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return $ret;
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}
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public function shiftLeft($bits=8)
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{
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$ret = new self();
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$ret->_rh = gmp_mul($this->_rh, gmp_pow(2, $bits));
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return $ret;
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}
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public function absoluteValue()
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{
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$ret = new self();
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$ret->_rh = gmp_abs($this->_rh);
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return $ret;
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}
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}
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