Cache.php
8 KB
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
257
258
259
260
261
262
<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* This reader caches the files of another reader
* It allow fast access to files. This is usefull if the access to the reader
* is slow (HTTP, FTP...), but will need more IO if the file is only extracted
*
* PHP versions 4 and 5
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330,Boston,MA 02111-1307 USA
*
* @category File Formats
* @package File_Archive
* @author Vincent Lascaux <vincentlascaux@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.gnu.org/copyleft/lesser.html LGPL
* @version CVS: $Id: Cache.php,v 1.1 2005/07/07 12:24:58 vincentlascaux Exp $
* @link http://pear.php.net/package/File_Archive
*/
require_once "File/Archive/Reader.php";
/**
* This reader caches the files of another reader
* It allow fast access to files. This is usefull if the access to the reader
* is slow (HTTP, FTP...), but will need more IO if the file is only extracted
*/
class File_Archive_Reader_Cache extends File_Archive_Reader
{
var $tmpFile;
var $files = array();
var $pos = 0;
var $fromSource = true;
var $endOfSource = false;
var $source;
/**
* $source is the reader to filter
*/
function File_Archive_Reader_Cache(&$source)
{
$this->source =& $source;
$this->tmpFile = tmpfile();
}
function _writeEndOfFile()
{
$bufferSize = File_Archive::getOption('blockSize');
while (($data = $this->source->getData($bufferSize))!=null) {
fwrite($this->tmpFile, $data);
}
}
/**
* @see File_Archive_Reader::next()
*/
function next()
{
//Write the end of the current file to the temp file
if ($this->fromSource && !empty($this->files)) {
$this->_writeEndOfFile();
}
if ($this->pos+1 < count($this->files) && !$this->fromSource) {
$this->pos++;
fseek($this->tmpFile, $this->files[$this->pos]['pos'], SEEK_SET);
return true;
} else {
$this->fromSource = true;
if ($this->endOfSource) {
return false;
}
$ret = $this->source->next();
if ($ret !== true) {
$this->endOfSource = true;
$this->source->close();
return $ret;
}
$this->endOfSource = false;
fseek($this->tmpFile, 0, SEEK_END);
$this->files[] = array(
'name' => $this->source->getFilename(),
'stat' => $this->source->getStat(),
'mime' => $this->source->getMime(),
'pos' => ftell($this->tmpFile)
);
$this->pos = count($this->files)-1;
return true;
}
}
/**
* @see File_Archive_Reader::getFilename()
*/
function getFilename() { return $this->files[$this->pos]['name']; }
/**
* @see File_Archive_Reader::getStat()
*/
function getStat() { return $this->files[$this->pos]['stat']; }
/**
* @see File_Archive_Reader::getMime()
*/
function getMime() { return $this->files[$this->pos]['mime']; }
/**
* @see File_Archive_Reader::getDataFilename()
*/
function getDataFilename() { return null; }
/**
* @see File_Archive_Reader::getData()
*/
function getData($length = -1)
{
if ($this->fromSource) {
$data = $this->source->getData($length);
if (PEAR::isError($data)) {
return $data;
}
fwrite($this->tmpFile, $data);
return $data;
} else {
if ($length == 0) {
return '';
}
if ($length > 0 && $this->pos+1 < count($this->files)) {
$maxSize = $this->files[$this->pos+1]['pos'] - ftell($this->tmpFile);
if ($maxSize == 0) {
return null;
}
if ($length > $maxSize) {
$length = $maxSize;
}
return fread($this->tmpFile, $length);
} else {
$contents = '';
$blockSize = File_Archive::getOption('blockSize');
while (!feof($this->tmpFile)) {
$contents .= fread($this->tmpFile, $blockSize);
}
return $contents == '' ? null : $contents;
}
}
}
/**
* @see File_Archive_Reader::skip()
*/
function skip($length = -1)
{
if ($this->fromSource) {
return strlen($this->getData($length));
} else {
if ($length >= 0 && $this->pos+1 < count($this->files)) {
$maxSize = $this->files[$this->pos+1]['pos'] - ftell($this->tmpFile);
if ($maxSize == 0) {
return null;
}
if ($length > $maxSize) {
$length = $maxSize;
}
fseek($this->tmpFile, $length, SEEK_CUR);
return $length;
} else {
$before = ftell($this->tmpFile);
fseek($this->tmpFile, 0, SEEK_SET);
$after = fteel($this->tmpFile);
return $after - $before;
}
}
}
/**
* @see File_Archive_Reader::rewind()
*/
function rewind($length = -1)
{
if ($this->fromSource) {
$this->_writeEndOfFile();
$this->fromSource = false;
}
$before = ftell($this->tmpFile);
$pos = $this->files[$this->pos]['pos'];
fseek($this->tmpFile, $pos, SEEK_SET);
return $pos - $before;
}
/**
* @see File_Archive_Reader::tell()
*/
function tell()
{
return ftell($this->tmpFile) - $this->files[$this->pos]['pos'];
}
/**
* @see File_Archive_Reader::close()
*/
function close()
{
$this->fromSource = false;
$this->pos = 0;
fseek($this->tmpFile, 0, SEEK_SET);
}
function _closeAndReset()
{
$this->close();
fclose($this->tmpFile);
$this->tmpFile = tmpfile();
$this->endOfSource = false;
$this->files = array();
$this->source->close();
}
/**
* @see File_Archive_Reader::makeAppendWriter()
*/
function makeAppendWriter()
{
$writer = $this->source->makeAppendWriter();
if (!PEAR::isError($writer)) {
$this->_closeAndReset();
}
return $writer;
}
/**
* @see File_Archive_Reader::makeWriterRemoveFiles()
*/
function makeWriterRemoveFiles($pred)
{
$writer = $this->source->makeWriterRemoveFiles($pred);
if (!PEAR::isError($writer)) {
$this->_closeAndReset();
}
return $writer;
}
/**
* @see File_Archive_Reader::makeWriterRemoveBlocks()
*/
function makeWriterRemoveBlocks($blocks, $seek = 0)
{
$writer = $this->source->makeWriterRemoveBlocks($blocks, $seek);
if (!PEAR::isError($writer)) {
$this->_closeAndReset();
}
return $writer;
}
}
?>