|
1
|
|
|
<?php declare(strict_types=1); |
|
2
|
|
|
|
|
3
|
|
|
/** |
|
4
|
|
|
* @package s9e\Bencode |
|
5
|
|
|
* @copyright Copyright (c) 2014-2021 The s9e authors |
|
6
|
|
|
* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
|
7
|
|
|
*/ |
|
8
|
|
|
namespace s9e\Bencode; |
|
9
|
|
|
|
|
10
|
|
|
use ArrayObject; |
|
11
|
|
|
use function get_object_vars, is_array, is_bool, is_float, is_int, is_object, is_string, ksort, strlen; |
|
12
|
|
|
use s9e\Bencode\Exceptions\EncodingException; |
|
13
|
|
|
use stdClass; |
|
14
|
|
|
|
|
15
|
|
|
class Encoder |
|
16
|
16 |
|
{ |
|
17
|
|
|
public static function encode($value): string |
|
18
|
16 |
|
{ |
|
19
|
16 |
|
if (is_string($value)) |
|
20
|
|
|
{ |
|
21
|
15 |
|
return strlen($value) . ':' . $value; |
|
22
|
|
|
} |
|
23
|
|
|
if (is_array($value)) |
|
24
|
1 |
|
{ |
|
25
|
|
|
return self::encodeArray($value); |
|
26
|
|
|
} |
|
27
|
|
|
if (is_int($value)) |
|
28
|
|
|
{ |
|
29
|
|
|
return "i{$value}e"; |
|
30
|
5 |
|
} |
|
31
|
|
|
if (is_object($value)) |
|
32
|
5 |
|
{ |
|
33
|
|
|
return self::encodeObject($value); |
|
34
|
1 |
|
} |
|
35
|
|
|
|
|
36
|
|
|
return self::encode(self::coerceUnsupportedValue($value)); |
|
37
|
4 |
|
} |
|
38
|
|
|
|
|
39
|
2 |
|
protected static function arrayIsList(array $array): bool |
|
40
|
|
|
{ |
|
41
|
|
|
$expectedKey = 0; |
|
42
|
|
|
foreach ($array as $k => $v) |
|
43
|
4 |
|
{ |
|
44
|
|
|
if ($k !== $expectedKey) |
|
45
|
|
|
{ |
|
46
|
7 |
|
return false; |
|
47
|
|
|
} |
|
48
|
7 |
|
++$expectedKey; |
|
49
|
|
|
} |
|
50
|
7 |
|
|
|
51
|
7 |
|
return true; |
|
52
|
|
|
} |
|
53
|
6 |
|
|
|
54
|
|
|
protected static function coerceBool(bool $value): int |
|
55
|
7 |
|
{ |
|
56
|
|
|
return (int) $value; |
|
57
|
7 |
|
} |
|
58
|
|
|
|
|
59
|
|
|
protected static function coerceFloat(float $value): int |
|
60
|
2 |
|
{ |
|
61
|
|
|
$int = (int) $value; |
|
62
|
2 |
|
if ((float) $int === $value) |
|
63
|
|
|
{ |
|
64
|
|
|
return $int; |
|
65
|
2 |
|
} |
|
66
|
|
|
|
|
67
|
2 |
|
throw new EncodingException('Unsupported value', $value); |
|
68
|
2 |
|
} |
|
69
|
|
|
|
|
70
|
1 |
|
protected static function coerceUnsupportedValue($value): array|int|string |
|
71
|
|
|
{ |
|
72
|
|
|
if (is_float($value)) |
|
73
|
1 |
|
{ |
|
74
|
|
|
return self::coerceFloat($value); |
|
75
|
|
|
} |
|
76
|
5 |
|
if (is_bool($value)) |
|
77
|
|
|
{ |
|
78
|
5 |
|
return self::coerceBool($value); |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
2 |
|
throw new EncodingException('Unsupported value', $value); |
|
82
|
|
|
} |
|
83
|
2 |
|
|
|
84
|
|
|
/** |
|
85
|
|
|
* Encode a PHP array into either a list of a dictionary |
|
86
|
9 |
|
*/ |
|
87
|
|
|
protected static function encodeArray(array $value): string |
|
88
|
9 |
|
{ |
|
89
|
|
|
return self::arrayIsList($value) |
|
90
|
|
|
? self::encodeIndexedArray($value) |
|
91
|
4 |
|
: self::encodeAssociativeArray($value); |
|
92
|
|
|
} |
|
93
|
4 |
|
|
|
94
|
4 |
|
protected static function encodeAssociativeArray(array $array): string |
|
95
|
4 |
|
{ |
|
96
|
|
|
ksort($array, SORT_STRING); |
|
97
|
3 |
|
|
|
98
|
|
|
$str = 'd'; |
|
99
|
|
|
foreach ($array as $k => $v) |
|
100
|
1 |
|
{ |
|
101
|
|
|
$str .= strlen((string) $k) . ':' . $k . self::encode($v); |
|
102
|
|
|
} |
|
103
|
2 |
|
$str .= 'e'; |
|
104
|
|
|
|
|
105
|
2 |
|
return $str; |
|
106
|
|
|
} |
|
107
|
|
|
|
|
108
|
|
|
protected static function encodeIndexedArray(array $array): string |
|
109
|
|
|
{ |
|
110
|
|
|
$str = 'l'; |
|
111
|
|
|
foreach ($array as $v) |
|
112
|
|
|
{ |
|
113
|
|
|
$str .= self::encode($v); |
|
114
|
|
|
} |
|
115
|
|
|
$str .= 'e'; |
|
116
|
|
|
|
|
117
|
|
|
return $str; |
|
118
|
|
|
} |
|
119
|
|
|
|
|
120
|
|
|
protected static function encodeObject(object $value): string |
|
121
|
|
|
{ |
|
122
|
|
|
if ($value instanceof ArrayObject) |
|
123
|
|
|
{ |
|
124
|
|
|
return self::encodeAssociativeArray($value->getArrayCopy()); |
|
125
|
|
|
} |
|
126
|
|
|
if ($value instanceof stdClass) |
|
127
|
|
|
{ |
|
128
|
|
|
return self::encodeAssociativeArray(get_object_vars($value)); |
|
129
|
|
|
} |
|
130
|
|
|
|
|
131
|
|
|
throw new EncodingException('Unsupported value', $value); |
|
132
|
|
|
} |
|
133
|
|
|
} |
s9e /
Bencode
