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
|
<?php
/**
* Native CDB file reader and writer
*
* @file
*/
/**
* Read from a CDB file.
* Native and pure PHP implementations are provided.
* http://cr.yp.to/cdb.html
*/
abstract class CdbReader {
/**
* Open a file and return a subclass instance
*
* @param $fileName string
*
* @return CdbReader
*/
public static function open( $fileName ) {
if ( self::haveExtension() ) {
return new CdbReader_DBA( $fileName );
} else {
wfDebug( "Warning: no dba extension found, using emulation.\n" );
return new CdbReader_PHP( $fileName );
}
}
/**
* Returns true if the native extension is available
*
* @return bool
*/
public static function haveExtension() {
if ( !function_exists( 'dba_handlers' ) ) {
return false;
}
$handlers = dba_handlers();
if ( !in_array( 'cdb', $handlers ) || !in_array( 'cdb_make', $handlers ) ) {
return false;
}
return true;
}
/**
* Construct the object and open the file
*/
abstract function __construct( $fileName );
/**
* Close the file. Optional, you can just let the variable go out of scope.
*/
abstract function close();
/**
* Get a value with a given key. Only string values are supported.
*
* @param $key string
*/
abstract public function get( $key );
}
/**
* Write to a CDB file.
* Native and pure PHP implementations are provided.
*/
abstract class CdbWriter {
/**
* Open a writer and return a subclass instance.
* The user must have write access to the directory, for temporary file creation.
*
* @param $fileName string
*
* @return bool
*/
public static function open( $fileName ) {
if ( CdbReader::haveExtension() ) {
return new CdbWriter_DBA( $fileName );
} else {
wfDebug( "Warning: no dba extension found, using emulation.\n" );
return new CdbWriter_PHP( $fileName );
}
}
/**
* Create the object and open the file
*/
abstract function __construct( $fileName );
/**
* Set a key to a given value. The value will be converted to string.
*/
abstract public function set( $key, $value );
/**
* Close the writer object. You should call this function before the object
* goes out of scope, to write out the final hashtables.
*/
abstract public function close();
}
/**
* Reader class which uses the DBA extension
*/
class CdbReader_DBA {
var $handle;
function __construct( $fileName ) {
$this->handle = dba_open( $fileName, 'r-', 'cdb' );
if ( !$this->handle ) {
throw new MWException( 'Unable to open CDB file "' . $fileName . '"' );
}
}
function close() {
if( isset($this->handle) )
dba_close( $this->handle );
unset( $this->handle );
}
function get( $key ) {
return dba_fetch( $key, $this->handle );
}
}
/**
* Writer class which uses the DBA extension
*/
class CdbWriter_DBA {
var $handle, $realFileName, $tmpFileName;
function __construct( $fileName ) {
$this->realFileName = $fileName;
$this->tmpFileName = $fileName . '.tmp.' . mt_rand( 0, 0x7fffffff );
$this->handle = dba_open( $this->tmpFileName, 'n', 'cdb_make' );
if ( !$this->handle ) {
throw new MWException( 'Unable to open CDB file for write "' . $fileName . '"' );
}
}
function set( $key, $value ) {
return dba_insert( $key, $value, $this->handle );
}
function close() {
if( isset($this->handle) )
dba_close( $this->handle );
if ( wfIsWindows() ) {
unlink( $this->realFileName );
}
if ( !rename( $this->tmpFileName, $this->realFileName ) ) {
throw new MWException( 'Unable to move the new CDB file into place.' );
}
unset( $this->handle );
}
function __destruct() {
if ( isset( $this->handle ) ) {
$this->close();
}
}
}
|
