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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Markus Goetz <markus@woboq.com>
* @author Robin Appelman <robin@icewind.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\DAV\Upload;
use Sabre\DAV\IFile;
/**
* Class AssemblyStream
*
* The assembly stream is a virtual stream that wraps multiple chunks.
* Reading from the stream transparently accessed the underlying chunks and
* give a representation as if they were already merged together.
*
* @package OCA\DAV\Upload
*/
class AssemblyStream implements \Icewind\Streams\File {
/** @var resource */
private $context;
/** @var IFile[] */
private $nodes;
/** @var int */
private $pos = 0;
/** @var int */
private $size = 0;
/** @var resource */
private $currentStream = null;
/** @var int */
private $currentNode = 0;
/**
* @param string $path
* @param string $mode
* @param int $options
* @param string &$opened_path
* @return bool
*/
public function stream_open($path, $mode, $options, &$opened_path) {
$this->loadContext('assembly');
$nodes = $this->nodes;
// http://stackoverflow.com/a/10985500
@usort($nodes, function (IFile $a, IFile $b) {
return strnatcmp($a->getName(), $b->getName());
});
$this->nodes = array_values($nodes);
if (count($this->nodes) > 0) {
$this->currentStream = $this->getStream($this->nodes[0]);
}
$this->size = array_reduce($this->nodes, function ($size, IFile $file) {
return $size + $file->getSize();
}, 0);
return true;
}
/**
* @param string $offset
* @param int $whence
* @return bool
*/
public function stream_seek($offset, $whence = SEEK_SET) {
return false;
}
/**
* @return int
*/
public function stream_tell() {
return $this->pos;
}
/**
* @param int $count
* @return string
*/
public function stream_read($count) {
if (is_null($this->currentStream)) {
return '';
}
do {
$data = fread($this->currentStream, $count);
$read = strlen($data);
if (feof($this->currentStream)) {
fclose($this->currentStream);
$this->currentNode++;
if ($this->currentNode < count($this->nodes)) {
$this->currentStream = $this->getStream($this->nodes[$this->currentNode]);
} else {
$this->currentStream = null;
}
}
// if no data read, try again with the next node because
// returning empty data can make the caller think there is no more
// data left to read
} while ($read === 0 && !is_null($this->currentStream));
// update position
$this->pos += $read;
return $data;
}
/**
* @param string $data
* @return int
*/
public function stream_write($data) {
return false;
}
/**
* @param int $option
* @param int $arg1
* @param int $arg2
* @return bool
*/
public function stream_set_option($option, $arg1, $arg2) {
return false;
}
/**
* @param int $size
* @return bool
*/
public function stream_truncate($size) {
return false;
}
/**
* @return array
*/
public function stream_stat() {
return [];
}
/**
* @param int $operation
* @return bool
*/
public function stream_lock($operation) {
return false;
}
/**
* @return bool
*/
public function stream_flush() {
return false;
}
/**
* @return bool
*/
public function stream_eof() {
return $this->pos >= $this->size || $this->currentStream === null;
}
/**
* @return bool
*/
public function stream_close() {
return true;
}
/**
* Load the source from the stream context and return the context options
*
* @param string $name
* @return array
* @throws \Exception
*/
protected function loadContext($name) {
$context = stream_context_get_options($this->context);
if (isset($context[$name])) {
$context = $context[$name];
} else {
throw new \BadMethodCallException('Invalid context, "' . $name . '" options not set');
}
if (isset($context['nodes']) and is_array($context['nodes'])) {
$this->nodes = $context['nodes'];
} else {
throw new \BadMethodCallException('Invalid context, nodes not set');
}
return $context;
}
/**
* @param IFile[] $nodes
* @return resource
*
* @throws \BadMethodCallException
*/
public static function wrap(array $nodes) {
$context = stream_context_create([
'assembly' => [
'nodes' => $nodes
]
]);
stream_wrapper_register('assembly', self::class);
try {
$wrapped = fopen('assembly://', 'r', null, $context);
} catch (\BadMethodCallException $e) {
stream_wrapper_unregister('assembly');
throw $e;
}
stream_wrapper_unregister('assembly');
return $wrapped;
}
/**
* @param IFile $node
* @return resource
*/
private function getStream(IFile $node) {
$data = $node->get();
if (is_resource($data)) {
return $data;
} else {
$tmp = fopen('php://temp', 'w+');
fwrite($tmp, $data);
rewind($tmp);
return $tmp;
}
}
}
|
