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pma/vendor/fgrosse/phpasn1/lib/Utility/BigIntegerBcmath.php

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+<?php
+/*
+ * This file is part of the PHPASN1 library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FG\Utility;
+
+/**
+ * Class BigIntegerBcmath
+ * Integer representation of big numbers using the bcmath library to perform large operations.
+ * @package FG\Utility
+ * @internal
+ */
+class BigIntegerBcmath extends BigInteger
+{
+    protected $_str;
+
+    public function __clone()
+    {
+        // nothing needed to copy
+    }
+
+    protected function _fromString($str)
+    {
+        $this->_str = (string)$str;
+    }
+
+    protected function _fromInteger($integer)
+    {
+        $this->_str = (string)$integer;
+    }
+
+    public function __toString()
+    {
+        return $this->_str;
+    }
+
+    public function toInteger()
+    {
+        if ($this->compare(PHP_INT_MAX) > 0 || $this->compare(PHP_INT_MIN) < 0) {
+            throw new \OverflowException(sprintf('Can not represent %s as integer.', $this->_str));
+        }
+        return (int)$this->_str;
+    }
+
+    public function isNegative()
+    {
+        return bccomp($this->_str, '0', 0) < 0;
+    }
+
+    protected function _unwrap($number)
+    {
+        if ($number instanceof self) {
+            return $number->_str;
+        }
+        return $number;
+    }
+
+    public function compare($number)
+    {
+        return bccomp($this->_str, $this->_unwrap($number), 0);
+    }
+
+    public function add($b)
+    {
+        $ret = new self();
+        $ret->_str = bcadd($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function subtract($b)
+    {
+        $ret = new self();
+        $ret->_str = bcsub($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function multiply($b)
+    {
+        $ret = new self();
+        $ret->_str = bcmul($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function modulus($b)
+    {
+        $ret = new self();
+        if ($this->isNegative()) {
+            // bcmod handles negative numbers differently
+            $b = $this->_unwrap($b);
+            $ret->_str = bcsub($b, bcmod(bcsub('0', $this->_str, 0), $b), 0);
+        }
+        else {
+            $ret->_str = bcmod($this->_str, $this->_unwrap($b));
+        }
+        return $ret;
+    }
+
+    public function toPower($b)
+    {
+        $ret = new self();
+        $ret->_str = bcpow($this->_str, $this->_unwrap($b), 0);
+        return $ret;
+    }
+
+    public function shiftRight($bits = 8)
+    {
+        $ret = new self();
+        $ret->_str = bcdiv($this->_str, bcpow('2', $bits));
+        return $ret;
+    }
+
+    public function shiftLeft($bits = 8) {
+        $ret = new self();
+        $ret->_str = bcmul($this->_str, bcpow('2', $bits));
+        return $ret;
+    }
+
+    public function absoluteValue()
+    {
+        $ret = new self();
+        if (-1 === bccomp($this->_str, '0', 0)) {
+            $ret->_str = bcsub('0', $this->_str, 0);
+        }
+        else {
+            $ret->_str = $this->_str;
+        }
+        return $ret;
+    }
+}