|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace BitWasp\Buffertools\Types; |
|
6
|
|
|
|
|
7
|
|
|
use BitWasp\Buffertools\Buffer; |
|
8
|
|
|
use BitWasp\Buffertools\ByteOrder; |
|
9
|
|
|
use BitWasp\Buffertools\Parser; |
|
10
|
|
|
|
|
11
|
|
|
abstract class AbstractSignedInt extends AbstractType implements SignedIntInterface |
|
12
|
|
|
{ |
|
13
|
|
|
/** |
|
14
|
|
|
* @param int $byteOrder |
|
15
|
|
|
*/ |
|
16
|
72 |
|
public function __construct(int $byteOrder = ByteOrder::BE) |
|
17
|
|
|
{ |
|
18
|
72 |
|
parent::__construct($byteOrder); |
|
19
|
72 |
|
} |
|
20
|
|
|
|
|
21
|
|
|
/** |
|
22
|
|
|
* @param int|string $integer |
|
23
|
|
|
* @return string |
|
24
|
|
|
*/ |
|
25
|
|
|
public function writeBits($integer): string |
|
26
|
|
|
{ |
|
27
|
|
|
return str_pad( |
|
28
|
|
|
gmp_strval(gmp_init($integer, 10), 2), |
|
29
|
|
|
$this->getBitSize(), |
|
30
|
|
|
'0', |
|
31
|
|
|
STR_PAD_LEFT |
|
32
|
|
|
); |
|
33
|
|
|
} |
|
34
|
|
|
|
|
35
|
|
|
/** |
|
36
|
|
|
* @param Parser $parser |
|
37
|
|
|
* @return int|string |
|
38
|
|
|
* @throws \BitWasp\Buffertools\Exceptions\ParserOutOfRange |
|
39
|
|
|
* @throws \Exception |
|
40
|
|
|
*/ |
|
41
|
12 |
|
public function readBits(Parser $parser) |
|
42
|
|
|
{ |
|
43
|
12 |
|
$bitSize = $this->getBitSize(); |
|
44
|
12 |
|
$byteSize = $bitSize / 8; |
|
45
|
|
|
|
|
46
|
12 |
|
$bytes = $parser->readBytes($byteSize); |
|
47
|
12 |
|
$bytes = $this->isBigEndian() ? $bytes : $bytes->flip(); |
|
48
|
12 |
|
$chars = $bytes->getBinary(); |
|
49
|
|
|
|
|
50
|
12 |
|
$offsetIndex = 0; |
|
51
|
12 |
|
$isNegative = (ord($chars[$offsetIndex]) & 0x80) != 0x00; |
|
52
|
12 |
|
$number = gmp_init(ord($chars[$offsetIndex++]) & 0x7F, 10); |
|
53
|
|
|
|
|
54
|
12 |
|
for ($i = 0; $i < $byteSize-1; $i++) { |
|
55
|
12 |
|
$number = gmp_or(gmp_mul($number, 0x100), ord($chars[$offsetIndex++])); |
|
56
|
|
|
} |
|
57
|
|
|
|
|
58
|
12 |
|
if ($isNegative) { |
|
59
|
4 |
|
$number = gmp_sub($number, gmp_pow(2, $bitSize - 1)); |
|
60
|
|
|
} |
|
61
|
|
|
|
|
62
|
12 |
|
return gmp_strval($number, 10); |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
|
|
/** |
|
66
|
|
|
* {@inheritdoc} |
|
67
|
|
|
* @see \BitWasp\Buffertools\Types\TypeInterface::write() |
|
68
|
|
|
*/ |
|
69
|
12 |
|
public function write($integer): string |
|
70
|
|
|
{ |
|
71
|
12 |
|
$bitSize = $this->getBitSize(); |
|
72
|
12 |
|
if (gmp_sign($integer) < 0) { |
|
73
|
4 |
|
$integer = gmp_add($integer, (gmp_sub(gmp_pow(2, $bitSize), 1))); |
|
74
|
4 |
|
$integer = gmp_add($integer, 1); |
|
75
|
|
|
} |
|
76
|
|
|
|
|
77
|
12 |
|
$binary = Buffer::hex(str_pad(gmp_strval($integer, 16), $bitSize/4, '0', STR_PAD_LEFT), $bitSize/8); |
|
78
|
|
|
|
|
79
|
12 |
|
if (!$this->isBigEndian()) { |
|
80
|
6 |
|
$binary = $binary->flip(); |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
12 |
|
return $binary->getBinary(); |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
|
|
/** |
|
87
|
|
|
* {@inheritdoc} |
|
88
|
|
|
* @see \BitWasp\Buffertools\Types\TypeInterface::read() |
|
89
|
|
|
*/ |
|
90
|
12 |
|
public function read(Parser $binary) |
|
91
|
|
|
{ |
|
92
|
12 |
|
return $this->readBits($binary); |
|
93
|
|
|
} |
|
94
|
|
|
} |
|
95
|
|
|
|
Bit-Wasp /
buffertools-php
