|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/* |
|
4
|
|
|
* The MIT License (MIT) |
|
5
|
|
|
* |
|
6
|
|
|
* Copyright (c) 2014-2016 Spomky-Labs |
|
7
|
|
|
* |
|
8
|
|
|
* This software may be modified and distributed under the terms |
|
9
|
|
|
* of the MIT license. See the LICENSE file for details. |
|
10
|
|
|
*/ |
|
11
|
|
|
|
|
12
|
|
|
namespace Jose\Compression; |
|
13
|
|
|
|
|
14
|
|
|
use Assert\Assertion; |
|
15
|
|
|
|
|
16
|
|
|
/** |
|
17
|
|
|
* This class implements the compression algorithm DEF (defalte) |
|
18
|
|
|
* This compression algorithm is part of the specification. |
|
19
|
|
|
*/ |
|
20
|
|
|
final class Deflate implements CompressionInterface |
|
21
|
|
|
{ |
|
22
|
|
|
/** |
|
23
|
|
|
* @var int |
|
24
|
|
|
*/ |
|
25
|
|
|
protected $compression_level = -1; |
|
26
|
|
|
|
|
27
|
|
|
/** |
|
28
|
|
|
* Deflate constructor. |
|
29
|
|
|
* |
|
30
|
|
|
* @param int $compression_level |
|
31
|
|
|
*/ |
|
32
|
|
|
public function __construct($compression_level = -1) |
|
33
|
|
|
{ |
|
34
|
|
|
Assertion::integer($compression_level, 'The compression level can be given as 0 for no compression up to 9 for maximum compression. If -1 given, the default compression level will be the default compression level of the zlib library.'); |
|
35
|
|
|
Assertion::range($compression_level, -1, 9, 'The compression level can be given as 0 for no compression up to 9 for maximum compression. If -1 given, the default compression level will be the default compression level of the zlib library.'); |
|
36
|
|
|
|
|
37
|
|
|
$this->compression_level = $compression_level; |
|
38
|
|
|
} |
|
39
|
|
|
|
|
40
|
|
|
/** |
|
41
|
|
|
* @return int |
|
42
|
|
|
*/ |
|
43
|
|
|
private function getCompressionLevel() |
|
44
|
|
|
{ |
|
45
|
|
|
return $this->compression_level; |
|
46
|
|
|
} |
|
47
|
|
|
|
|
48
|
|
|
/** |
|
49
|
|
|
* {@inheritdoc} |
|
50
|
|
|
*/ |
|
51
|
|
|
public function getMethodName() |
|
52
|
|
|
{ |
|
53
|
|
|
return 'DEF'; |
|
54
|
|
|
} |
|
55
|
|
|
|
|
56
|
|
|
/** |
|
57
|
|
|
* {@inheritdoc} |
|
58
|
|
|
*/ |
|
59
|
|
|
public function compress($data) |
|
60
|
|
|
{ |
|
61
|
|
|
$data = gzdeflate($data, $this->getCompressionLevel()); |
|
62
|
|
|
Assertion::false(false === $data, 'Unable to compress data'); |
|
63
|
|
|
|
|
64
|
|
|
return $data; |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
/** |
|
68
|
|
|
* {@inheritdoc} |
|
69
|
|
|
*/ |
|
70
|
|
|
public function uncompress($data) |
|
71
|
|
|
{ |
|
72
|
|
|
$data = gzinflate($data); |
|
73
|
|
|
Assertion::false(false === $data, 'Unable to uncompress data'); |
|
74
|
|
|
|
|
75
|
|
|
return $data; |
|
76
|
|
|
} |
|
77
|
|
|
} |
|
78
|
|
|
|
Spomky-Labs /
jose
