defender-security / vendor / spomky-labs / cbor-php / src / OtherObject / SinglePrecisionFloatObject.php

SinglePrecisionFloatObject.php in Defender Security – Malware Scanner, Login Security & Firewall 3.0.1, at vendor/spomky-labs/cbor-php/src/OtherObject/SinglePrecisionFloatObject.php

88 lines 2.2 KB

Raw Download Zip

1	<?php
2
3	declare(strict_types=1);
4
5	/*
6	* The MIT License (MIT)
7	*
8	* Copyright (c) 2018-2020 Spomky-Labs
9	*
10	* This software may be modified and distributed under the terms
11	* of the MIT license. See the LICENSE file for details.
12	*/
13
14	namespace CBOR\OtherObject;
15
16	use Assert\Assertion;
17	use Brick\Math\BigInteger;
18	use CBOR\OtherObject as Base;
19	use CBOR\Utils;
20	use InvalidArgumentException;
21
22	final class SinglePrecisionFloatObject extends Base
23	{
24	public static function supportedAdditionalInformation(): array
25	{
26	return [26];
27	}
28
29	public static function createFromLoadedData(int $additionalInformation, ?string $data): Base
30	{
31	return new self($additionalInformation, $data);
32	}
33
34	/**
35	* @return SinglePrecisionFloatObject
36	*/
37	public static function create(string $value): self
38	{
39	if (4 !== mb_strlen($value, '8bit')) {
40	throw new InvalidArgumentException('The value is not a valid single precision floating point');
41	}
42
43	return new self(26, $value);
44	}
45
46	public function getNormalizedData(bool $ignoreTags = false)
47	{
48	$exp = $this->getExponent();
49	$mant = $this->getMantissa();
50	$sign = $this->getSign();
51
52	if (0 === $exp) {
53	$val = $mant * 2 ** (-(126 + 23));
54	} elseif (0b11111111 !== $exp) {
55	$val = ($mant + (1 << 23)) * 2 ** ($exp - (127 + 23));
56	} else {
57	$val = 0 === $mant ? INF : NAN;
58	}
59
60	return $sign * $val;
61	}
62
63	public function getExponent(): int
64	{
65	$data = $this->data;
66	Assertion::string($data, 'Invalid data');
67
68	return Utils::binToBigInteger($data)->shiftedRight(23)->and(Utils::hexToBigInteger('ff'))->toInt();
69	}
70
71	public function getMantissa(): int
72	{
73	$data = $this->data;
74	Assertion::string($data, 'Invalid data');
75
76	return Utils::binToBigInteger($data)->and(Utils::hexToBigInteger('7fffff'))->toInt();
77	}
78
79	public function getSign(): int
80	{
81	$data = $this->data;
82	Assertion::string($data, 'Invalid data');
83	$sign = Utils::binToBigInteger($data)->shiftedRight(32);
84
85	return $sign->isEqualTo(BigInteger::one()) ? -1 : 1;
86	}
87	}
88