1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
<?php
/**
* Output buffering wrapper
*/
declare(strict_types=1);
namespace PhpMyAdmin;
use function defined;
use function flush;
use function function_exists;
use function header;
use function ini_get;
use function ob_end_clean;
use function ob_flush;
use function ob_get_contents;
use function ob_get_length;
use function ob_get_level;
use function ob_get_status;
use function ob_start;
use function register_shutdown_function;
use function sprintf;
/**
* Output buffering wrapper class
*/
class OutputBuffering
{
/** @var self */
private static $instance;
/** @var int */
private $mode;
/** @var string */
private $content;
/** @var bool */
private $on;
/**
* Initializes class
*/
private function __construct()
{
$this->mode = $this->getMode();
$this->on = false;
}
/**
* This function could be used eventually to support more modes.
*
* @return int the output buffer mode
*/
private function getMode()
{
$mode = 0;
if ($GLOBALS['cfg']['OBGzip'] && function_exists('ob_start')) {
if (ini_get('output_handler') === 'ob_gzhandler') {
// If a user sets the output_handler in php.ini to ob_gzhandler, then
// any right frame file in phpMyAdmin will not be handled properly by
// the browser. My fix was to check the ini file within the
// PMA_outBufferModeGet() function.
$mode = 0;
} elseif (function_exists('ob_get_level') && ob_get_level() > 0) {
// happens when php.ini's output_buffering is not Off
ob_end_clean();
$mode = 1;
} else {
$mode = 1;
}
}
// Zero (0) is no mode or in other words output buffering is OFF.
// Follow 2^0, 2^1, 2^2, 2^3 type values for the modes.
// Useful if we ever decide to combine modes. Then a bitmask field of
// the sum of all modes will be the natural choice.
return $mode;
}
/**
* Returns the singleton OutputBuffering object
*
* @return OutputBuffering object
*/
public static function getInstance()
{
if (empty(self::$instance)) {
self::$instance = new OutputBuffering();
}
return self::$instance;
}
/**
* This function will need to run at the top of all pages if output
* output buffering is turned on. It also needs to be passed $mode from
* the PMA_outBufferModeGet() function or it will be useless.
*/
public function start(): void
{
if ($this->on) {
return;
}
if ($this->mode && function_exists('ob_gzhandler')) {
ob_start('ob_gzhandler');
}
ob_start();
$this->sendHeader('X-ob_mode', (string) $this->mode);
register_shutdown_function(
[
self::class,
'stop',
]
);
$this->on = true;
}
private function sendHeader(string $name, string $value): void
{
if (defined('TESTSUITE')) {
return;
}
header(sprintf('%s: %s', $name, $value));
}
/**
* This function will need to run at the bottom of all pages if output
* buffering is turned on. It also needs to be passed $mode from the
* PMA_outBufferModeGet() function or it will be useless.
*/
public static function stop(): void
{
$buffer = self::getInstance();
if (! $buffer->on) {
return;
}
$buffer->on = false;
$buffer->content = ob_get_contents();
if (ob_get_length() <= 0) {
return;
}
ob_end_clean();
}
/**
* Gets buffer content
*
* @return string buffer content
*/
public function getContents()
{
return $this->content;
}
/**
* Flushes output buffer
*/
public function flush(): void
{
if (ob_get_status() && $this->mode) {
ob_flush();
} else {
flush();
}
}
}
|
