1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
<?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;
}
}
|
