defender-security / vendor / spomky-labs / cbor-php / src / Decoder.php

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

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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;
15
16	use CBOR\OtherObject\BreakObject;
17	use CBOR\OtherObject\OtherObjectManager;
18	use CBOR\Tag\TagObjectManager;
19	use InvalidArgumentException;
20	use function ord;
21	use RuntimeException;
22
23	final class Decoder
24	{
25	/**
26	* @var TagObjectManager
27	*/
28	private $tagObjectManager;
29
30	/**
31	* @var OtherObjectManager
32	*/
33	private $otherTypeManager;
34
35	public function __construct(TagObjectManager $tagObjectManager, OtherObjectManager $otherTypeManager)
36	{
37	$this->tagObjectManager = $tagObjectManager;
38	$this->otherTypeManager = $otherTypeManager;
39	}
40
41	public function decode(Stream $stream): CBORObject
42	{
43	return $this->process($stream);
44	}
45
46	private function process(Stream $stream, bool $breakable = false): CBORObject
47	{
48	$ib = ord($stream->read(1));
49	$mt = $ib >> 5;
50	$ai = $ib & 0b00011111;
51	$val = null;
52	switch ($ai) {
53	case 0b00011000: //24
54	case 0b00011001: //25
55	case 0b00011010: //26
56	case 0b00011011: //27
57	$val = $stream->read(2 ** ($ai & 0b00000111));
58	break;
59	case 0b00011100: //28
60	case 0b00011101: //29
61	case 0b00011110: //30
62	throw new InvalidArgumentException(sprintf('Cannot parse the data. Found invalid Additional Information "%s" (%d).', str_pad(decbin($ai), 5, '0', STR_PAD_LEFT), $ai));
63	case 0b00011111: //31
64	return $this->processInfinite($stream, $mt, $breakable);
65	}
66
67	return $this->processFinite($stream, $mt, $ai, $val);
68	}
69
70	private function processFinite(Stream $stream, int $mt, int $ai, ?string $val): CBORObject
71	{
72	switch ($mt) {
73	case 0b000: //0
74	return UnsignedIntegerObject::createObjectForValue($ai, $val);
75	case 0b001: //1
76	return SignedIntegerObject::createObjectForValue($ai, $val);
77	case 0b010: //2
78	$length = null === $val ? $ai : Utils::binToInt($val);
79
80	return new ByteStringObject($stream->read($length));
81	case 0b011: //3
82	$length = null === $val ? $ai : Utils::binToInt($val);
83
84	return new TextStringObject($stream->read($length));
85	case 0b100: //4
86	$object = new ListObject();
87	$nbItems = null === $val ? $ai : Utils::binToInt($val);
88	for ($i = 0; $i < $nbItems; ++$i) {
89	$object->add($this->process($stream));
90	}
91
92	return $object;
93	case 0b101: //5
94	$object = new MapObject();
95	$nbItems = null === $val ? $ai : Utils::binToInt($val);
96	for ($i = 0; $i < $nbItems; ++$i) {
97	$object->add($this->process($stream), $this->process($stream));
98	}
99
100	return $object;
101	case 0b110: //6
102	return $this->tagObjectManager->createObjectForValue($ai, $val, $this->process($stream));
103	case 0b111: //7
104	return $this->otherTypeManager->createObjectForValue($ai, $val);
105	default:
106	throw new RuntimeException(sprintf('Unsupported major type "%s" (%d).', str_pad(decbin($mt), 5, '0', STR_PAD_LEFT), $mt)); // Should never append
107	}
108	}
109
110	private function processInfinite(Stream $stream, int $mt, bool $breakable): CBORObject
111	{
112	switch ($mt) {
113	case 0b010: //2
114	$object = new ByteStringWithChunkObject();
115	while (!($it = $this->process($stream, true)) instanceof BreakObject) {
116	if (!$it instanceof ByteStringObject) {
117	throw new RuntimeException('Unable to parse the data. Infinite Byte String object can only get Byte String objects.');
118	}
119	$object->add($it);
120	}
121
122	return $object;
123	case 0b011: //3
124	$object = new TextStringWithChunkObject();
125	while (!($it = $this->process($stream, true)) instanceof BreakObject) {
126	if (!$it instanceof TextStringObject) {
127	throw new RuntimeException('Unable to parse the data. Infinite Text String object can only get Text String objects.');
128	}
129	$object->add($it);
130	}
131
132	return $object;
133	case 0b100: //4
134	$object = new InfiniteListObject();
135	while (!($it = $this->process($stream, true)) instanceof BreakObject) {
136	$object->add($it);
137	}
138
139	return $object;
140	case 0b101: //5
141	$object = new InfiniteMapObject();
142	while (!($it = $this->process($stream, true)) instanceof BreakObject) {
143	$object->append($it, $this->process($stream));
144	}
145
146	return $object;
147	case 0b111: //7
148	if (!$breakable) {
149	throw new InvalidArgumentException('Cannot parse the data. No enclosing indefinite.');
150	}
151
152	return new BreakObject();
153	case 0b000: //0
154	case 0b001: //1
155	case 0b110: //6
156	default:
157	throw new InvalidArgumentException(sprintf('Cannot parse the data. Found infinite length for Major Type "%s" (%d).', str_pad(decbin($mt), 5, '0', STR_PAD_LEFT), $mt));
158	}
159	}
160	}
161