This file is indexed.

/usr/share/php/Cache/Lite.php is in php-cache-lite 1.7.15-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
<?php

/**
* Fast, light and safe Cache Class
*
* Cache_Lite is a fast, light and safe cache system. It's optimized
* for file containers. It is fast and safe (because it uses file
* locking and/or anti-corruption tests).
*
* There are some examples in the 'docs/examples' file
* Technical choices are described in the 'docs/technical' file
*
* Memory Caching is from an original idea of
* Mike BENOIT <ipso@snappymail.ca>
*
* Nota : A chinese documentation (thanks to RainX <china_1982@163.com>) is
* available at :
* http://rainx.phpmore.com/manual/cache_lite.html
*
* @package Cache_Lite
* @category Caching
* @author Fabien MARTY <fab@php.net>
* @author Markus Tacker <tacker@php.net>
*/

define('CACHE_LITE_ERROR_RETURN', 1);
define('CACHE_LITE_ERROR_DIE', 8);

class Cache_Lite
{

    // --- Private properties ---

    /**
    * Directory where to put the cache files
    * (make sure to add a trailing slash)
    *
    * @var string $_cacheDir
    */
    var $_cacheDir = '/tmp/';

    /**
    * Enable / disable caching
    *
    * (can be very usefull for the debug of cached scripts)
    *
    * @var boolean $_caching
    */
    var $_caching = true;

    /**
    * Cache lifetime (in seconds)
    *
    * If null, the cache is valid forever.
    *
    * @var int $_lifeTime
    */
    var $_lifeTime = 3600;

    /**
    * Enable / disable fileLocking
    *
    * (can avoid cache corruption under bad circumstances)
    *
    * @var boolean $_fileLocking
    */
    var $_fileLocking = true;

    /**
    * Timestamp of the last valid cache
    *
    * @var int $_refreshTime
    */
    var $_refreshTime;

    /**
    * File name (with path)
    *
    * @var string $_file
    */
    var $_file;
    
    /**
    * File name (without path)
    *
    * @var string $_fileName
    */
    var $_fileName;

    /**
    * Enable / disable write control (the cache is read just after writing to detect corrupt entries)
    *
    * Enable write control will lightly slow the cache writing but not the cache reading
    * Write control can detect some corrupt cache files but maybe it's not a perfect control
    *
    * @var boolean $_writeControl
    */
    var $_writeControl = true;

    /**
    * Enable / disable read control
    *
    * If enabled, a control key is embeded in cache file and this key is compared with the one
    * calculated after the reading.
    *
    * @var boolean $_writeControl
    */
    var $_readControl = true;

    /**
    * Type of read control (only if read control is enabled)
    *
    * Available values are :
    * 'md5' for a md5 hash control (best but slowest)
    * 'crc32' for a crc32 hash control (lightly less safe but faster, better choice)
    * 'strlen' for a length only test (fastest)
    *
    * @var boolean $_readControlType
    */
    var $_readControlType = 'crc32';

    /**
    * Pear error mode (when raiseError is called)
    *
    * (see PEAR doc)
    *
    * @see setToDebug()
    * @var int $_pearErrorMode
    */
    var $_pearErrorMode = CACHE_LITE_ERROR_RETURN;
    
    /**
    * Current cache id
    *
    * @var string $_id
    */
    var $_id;

    /**
    * Current cache group
    *
    * @var string $_group
    */
    var $_group;

    /**
    * Enable / Disable "Memory Caching"
    *
    * NB : There is no lifetime for memory caching ! 
    *
    * @var boolean $_memoryCaching
    */
    var $_memoryCaching = false;

    /**
    * Enable / Disable "Only Memory Caching"
    * (be carefull, memory caching is "beta quality")
    *
    * @var boolean $_onlyMemoryCaching
    */
    var $_onlyMemoryCaching = false;

    /**
    * Memory caching array
    *
    * @var array $_memoryCachingArray
    */
    var $_memoryCachingArray = array();

    /**
    * Memory caching counter
    *
    * @var int $memoryCachingCounter
    */
    var $_memoryCachingCounter = 0;

    /**
    * Memory caching limit
    *
    * @var int $memoryCachingLimit
    */
    var $_memoryCachingLimit = 1000;
    
    /**
    * File Name protection
    *
    * if set to true, you can use any cache id or group name
    * if set to false, it can be faster but cache ids and group names
    * will be used directly in cache file names so be carefull with
    * special characters...
    *
    * @var boolean $fileNameProtection
    */
    var $_fileNameProtection = true;
    
    /**
    * Enable / disable automatic serialization
    *
    * it can be used to save directly datas which aren't strings
    * (but it's slower)    
    *
    * @var boolean $_serialize
    */
    var $_automaticSerialization = false;
    
    /**
    * Disable / Tune the automatic cleaning process
    *
    * The automatic cleaning process destroy too old (for the given life time)
    * cache files when a new cache file is written.
    * 0               => no automatic cache cleaning
    * 1               => systematic cache cleaning
    * x (integer) > 1 => automatic cleaning randomly 1 times on x cache write
    *
    * @var int $_automaticCleaning
    */
    var $_automaticCleaningFactor = 0;
    
    /**
    * Nested directory level
    *
    * Set the hashed directory structure level. 0 means "no hashed directory 
    * structure", 1 means "one level of directory", 2 means "two levels"... 
    * This option can speed up Cache_Lite only when you have many thousands of 
    * cache file. Only specific benchs can help you to choose the perfect value 
    * for you. Maybe, 1 or 2 is a good start.
    *
    * @var int $_hashedDirectoryLevel
    */
    var $_hashedDirectoryLevel = 0;
    
    /**
    * Umask for hashed directory structure
    *
    * @var int $_hashedDirectoryUmask
    */
    var $_hashedDirectoryUmask = 0700;
    
    /**
     * API break for error handling in CACHE_LITE_ERROR_RETURN mode
     * 
     * In CACHE_LITE_ERROR_RETURN mode, error handling was not good because
     * for example save() method always returned a boolean (a PEAR_Error object
     * would be better in CACHE_LITE_ERROR_RETURN mode). To correct this without
     * breaking the API, this option (false by default) can change this handling.
     * 
     * @var boolean
     */
    var $_errorHandlingAPIBreak = false;
    
    // --- Public methods ---

    /**
    * Constructor
    *
    * $options is an assoc. Available options are :
    * $options = array(
    *     'cacheDir' => directory where to put the cache files (string),
    *     'caching' => enable / disable caching (boolean),
    *     'lifeTime' => cache lifetime in seconds (int),
    *     'fileLocking' => enable / disable fileLocking (boolean),
    *     'writeControl' => enable / disable write control (boolean),
    *     'readControl' => enable / disable read control (boolean),
    *     'readControlType' => type of read control 'crc32', 'md5', 'strlen' (string),
    *     'pearErrorMode' => pear error mode (when raiseError is called) (cf PEAR doc) (int),
    *     'memoryCaching' => enable / disable memory caching (boolean),
    *     'onlyMemoryCaching' => enable / disable only memory caching (boolean),
    *     'memoryCachingLimit' => max nbr of records to store into memory caching (int),
    *     'fileNameProtection' => enable / disable automatic file name protection (boolean),
    *     'automaticSerialization' => enable / disable automatic serialization (boolean),
    *     'automaticCleaningFactor' => distable / tune automatic cleaning process (int),
    *     'hashedDirectoryLevel' => level of the hashed directory system (int),
    *     'hashedDirectoryUmask' => umask for hashed directory structure (int),
    *     'errorHandlingAPIBreak' => API break for better error handling ? (boolean)
    * );
    * 
    * If sys_get_temp_dir() is available and the 
    * 'cacheDir' option is not provided in the 
    * constructor options array its output is used 
    * to determine the suitable temporary directory.
    * 
    * @see http://de.php.net/sys_get_temp_dir
    * @see http://pear.php.net/bugs/bug.php?id=18328
    *
    * @param array $options options
    * @access public
    */
    function Cache_Lite($options = array(NULL))
    {
        foreach($options as $key => $value) {
            $this->setOption($key, $value);
        }
        if (!isset($options['cacheDir']) && function_exists('sys_get_temp_dir')) {
        	$this->setOption('cacheDir', sys_get_temp_dir() . DIRECTORY_SEPARATOR);
        }
    }
    
    /**
    * Generic way to set a Cache_Lite option
    *
    * see Cache_Lite constructor for available options
    *
    * @var string $name name of the option
    * @var mixed $value value of the option
    * @access public
    */
    function setOption($name, $value) 
    {
        $availableOptions = array('errorHandlingAPIBreak', 'hashedDirectoryUmask', 'hashedDirectoryLevel', 'automaticCleaningFactor', 'automaticSerialization', 'fileNameProtection', 'memoryCaching', 'onlyMemoryCaching', 'memoryCachingLimit', 'cacheDir', 'caching', 'lifeTime', 'fileLocking', 'writeControl', 'readControl', 'readControlType', 'pearErrorMode');
        if (in_array($name, $availableOptions)) {
            $property = '_'.$name;
            $this->$property = $value;
        }
    }
    
    /**
    * Test if a cache is available and (if yes) return it
    *
    * @param string $id cache id
    * @param string $group name of the cache group
    * @param boolean $doNotTestCacheValidity if set to true, the cache validity won't be tested
    * @return string data of the cache (else : false)
    * @access public
    */
    function get($id, $group = 'default', $doNotTestCacheValidity = false)
    {
        $this->_id = $id;
        $this->_group = $group;
        $data = false;
        if ($this->_caching) {
            $this->_setRefreshTime();
            $this->_setFileName($id, $group);
            clearstatcache();
            if ($this->_memoryCaching) {
                if (isset($this->_memoryCachingArray[$this->_file])) {
                    if ($this->_automaticSerialization) {
                        return unserialize($this->_memoryCachingArray[$this->_file]);
                    }
                    return $this->_memoryCachingArray[$this->_file];
                }
                if ($this->_onlyMemoryCaching) {
                    return false;
                }                
            }
            if (($doNotTestCacheValidity) || (is_null($this->_refreshTime))) {
                if (file_exists($this->_file)) {
                    $data = $this->_read();
                }
            } else {
                if ((file_exists($this->_file)) && (@filemtime($this->_file) > $this->_refreshTime)) {
                    $data = $this->_read();
                }
            }
            if (($data) and ($this->_memoryCaching)) {
                $this->_memoryCacheAdd($data);
            }
            if (($this->_automaticSerialization) and (is_string($data))) {
                $data = unserialize($data);
            }
            return $data;
        }
        return false;
    }
    
    /**
    * Save some data in a cache file
    *
    * @param string $data data to put in cache (can be another type than strings if automaticSerialization is on)
    * @param string $id cache id
    * @param string $group name of the cache group
    * @return boolean true if no problem (else : false or a PEAR_Error object)
    * @access public
    */
    function save($data, $id = NULL, $group = 'default')
    {
        if ($this->_caching) {
            if ($this->_automaticSerialization) {
                $data = serialize($data);
            }
            if (isset($id)) {
                $this->_setFileName($id, $group);
            }
            if ($this->_memoryCaching) {
                $this->_memoryCacheAdd($data);
                if ($this->_onlyMemoryCaching) {
                    return true;
                }
            }
            if ($this->_automaticCleaningFactor>0 && ($this->_automaticCleaningFactor==1 || mt_rand(1, $this->_automaticCleaningFactor)==1)) {
				$this->clean(false, 'old');			
			}
            if ($this->_writeControl) {
                $res = $this->_writeAndControl($data);
                if (is_bool($res)) {
                    if ($res) {
                        return true;  
                    }
                    // if $res if false, we need to invalidate the cache
                    @touch($this->_file, time() - 2*abs($this->_lifeTime));
                    return false;
                }            
            } else {
                $res = $this->_write($data);
            }
            if (is_object($res)) {
                // $res is a PEAR_Error object 
                if (!($this->_errorHandlingAPIBreak)) {   
                    return false; // we return false (old API)
                }
            }
            return $res;
        }
        return false;
    }

    /**
    * Remove a cache file
    *
    * @param string $id cache id
    * @param string $group name of the cache group
    * @param boolean $checkbeforeunlink check if file exists before removing it
    * @return boolean true if no problem
    * @access public
    */
    function remove($id, $group = 'default', $checkbeforeunlink = false)
    {
        $this->_setFileName($id, $group);
        if ($this->_memoryCaching) {
            if (isset($this->_memoryCachingArray[$this->_file])) {
                unset($this->_memoryCachingArray[$this->_file]);
                $this->_memoryCachingCounter = $this->_memoryCachingCounter - 1;
            }
            if ($this->_onlyMemoryCaching) {
                return true;
            }
        }
        if ( $checkbeforeunlink ) {
            if (!file_exists($this->_file)) return true;
        }
        return $this->_unlink($this->_file);
    }

    /**
    * Clean the cache
    *
    * if no group is specified all cache files will be destroyed
    * else only cache files of the specified group will be destroyed
    *
    * @param string $group name of the cache group
    * @param string $mode flush cache mode : 'old', 'ingroup', 'notingroup', 
    *                                        'callback_myFunction'
    * @return boolean true if no problem
    * @access public
    */
    function clean($group = false, $mode = 'ingroup')
    {
        return $this->_cleanDir($this->_cacheDir, $group, $mode);
    }
       
    /**
    * Set to debug mode
    *
    * When an error is found, the script will stop and the message will be displayed
    * (in debug mode only). 
    *
    * @access public
    */
    function setToDebug()
    {
        $this->setOption('pearErrorMode', CACHE_LITE_ERROR_DIE);
    }

    /**
    * Set a new life time
    *
    * @param int $newLifeTime new life time (in seconds)
    * @access public
    */
    function setLifeTime($newLifeTime)
    {
        $this->_lifeTime = $newLifeTime;
        $this->_setRefreshTime();
    }

    /**
    * Save the state of the caching memory array into a cache file cache
    *
    * @param string $id cache id
    * @param string $group name of the cache group
    * @access public
    */
    function saveMemoryCachingState($id, $group = 'default')
    {
        if ($this->_caching) {
            $array = array(
                'counter' => $this->_memoryCachingCounter,
                'array' => $this->_memoryCachingArray
            );
            $data = serialize($array);
            $this->save($data, $id, $group);
        }
    }

    /**
    * Load the state of the caching memory array from a given cache file cache
    *
    * @param string $id cache id
    * @param string $group name of the cache group
    * @param boolean $doNotTestCacheValidity if set to true, the cache validity won't be tested
    * @access public
    */
    function getMemoryCachingState($id, $group = 'default', $doNotTestCacheValidity = false)
    {
        if ($this->_caching) {
            if ($data = $this->get($id, $group, $doNotTestCacheValidity)) {
                $array = unserialize($data);
                $this->_memoryCachingCounter = $array['counter'];
                $this->_memoryCachingArray = $array['array'];
            }
        }
    }
    
    /**
    * Return the cache last modification time
    *
    * BE CAREFUL : THIS METHOD IS FOR HACKING ONLY !
    *
    * @return int last modification time
    */
    function lastModified() 
    {
        return @filemtime($this->_file);
    }
    
    /**
    * Trigger a PEAR error
    *
    * To improve performances, the PEAR.php file is included dynamically.
    * The file is so included only when an error is triggered. So, in most
    * cases, the file isn't included and perfs are much better.
    *
    * @param string $msg error message
    * @param int $code error code
    * @access public
    */
    function raiseError($msg, $code)
    {
        include_once('PEAR.php');
        return PEAR::raiseError($msg, $code, $this->_pearErrorMode);
    }
    
    /**
     * Extend the life of a valid cache file
     * 
     * see http://pear.php.net/bugs/bug.php?id=6681
     * 
     * @access public
     */
    function extendLife()
    {
        @touch($this->_file);
    }
    
    // --- Private methods ---
    
    /**
    * Compute & set the refresh time
    *
    * @access private
    */
    function _setRefreshTime() 
    {
        if (is_null($this->_lifeTime)) {
            $this->_refreshTime = null;
        } else {
            $this->_refreshTime = time() - $this->_lifeTime;
        }
    }
    
    /**
    * Remove a file
    * 
    * @param string $file complete file path and name
    * @return boolean true if no problem
    * @access private
    */
    function _unlink($file)
    {
        if (!@unlink($file)) {
            return $this->raiseError('Cache_Lite : Unable to remove cache !', -3);
        }
        return true;        
    }

    /**
    * Recursive function for cleaning cache file in the given directory
    *
    * @param string $dir directory complete path (with a trailing slash)
    * @param string $group name of the cache group
    * @param string $mode flush cache mode : 'old', 'ingroup', 'notingroup',
                                             'callback_myFunction'
    * @return boolean true if no problem
    * @access private
    */
    function _cleanDir($dir, $group = false, $mode = 'ingroup')     
    {
        if ($this->_fileNameProtection) {
            $motif = ($group) ? 'cache_'.md5($group).'_' : 'cache_';
        } else {
            $motif = ($group) ? 'cache_'.$group.'_' : 'cache_';
        }
        if ($this->_memoryCaching) {
	    foreach($this->_memoryCachingArray as $key => $v) {
                if (strpos($key, $motif) !== false) {
                    unset($this->_memoryCachingArray[$key]);
                    $this->_memoryCachingCounter = $this->_memoryCachingCounter - 1;
                }
            }
            if ($this->_onlyMemoryCaching) {
                return true;
            }
        }
        if (!($dh = opendir($dir))) {
            return $this->raiseError('Cache_Lite : Unable to open cache directory !', -4);
        }
        $result = true;
        while (($file = readdir($dh)) !== false) {
            if (($file != '.') && ($file != '..')) {
                if (substr($file, 0, 6)=='cache_') {
                    $file2 = $dir . $file;
                    if (is_file($file2)) {
                        switch (substr($mode, 0, 9)) {
                            case 'old':
                                // files older than lifeTime get deleted from cache
                                if (!is_null($this->_lifeTime)) {
                                    if ((time() - @filemtime($file2)) > $this->_lifeTime) {
                                        $result = ($result and ($this->_unlink($file2)));
                                    }
                                }
                                break;
                            case 'notingrou':
                                if (strpos($file2, $motif) === false) {
                                    $result = ($result and ($this->_unlink($file2)));
                                }
                                break;
                            case 'callback_':
                                $func = substr($mode, 9, strlen($mode) - 9);
                                if ($func($file2, $group)) {
                                    $result = ($result and ($this->_unlink($file2)));
                                }
                                break;
                            case 'ingroup':
                            default:
                                if (strpos($file2, $motif) !== false) {
                                    $result = ($result and ($this->_unlink($file2)));
                                }
                                break;
                        }
                    }
                    if ((is_dir($file2)) and ($this->_hashedDirectoryLevel>0)) {
                        $result = ($result and ($this->_cleanDir($file2 . '/', $group, $mode)));
                    }
                }
            }
        }
        return $result;
    }
      
    /**
    * Add some date in the memory caching array
    *
    * @param string $data data to cache
    * @access private
    */
    function _memoryCacheAdd($data)
    {
        $this->_memoryCachingArray[$this->_file] = $data;
        if ($this->_memoryCachingCounter >= $this->_memoryCachingLimit) {
            list($key, ) = each($this->_memoryCachingArray);
            unset($this->_memoryCachingArray[$key]);
        } else {
            $this->_memoryCachingCounter = $this->_memoryCachingCounter + 1;
        }
    }

    /**
    * Make a file name (with path)
    *
    * @param string $id cache id
    * @param string $group name of the group
    * @access private
    */
    function _setFileName($id, $group)
    {
        
        if ($this->_fileNameProtection) {
            $suffix = 'cache_'.md5($group).'_'.md5($id);
        } else {
            $suffix = 'cache_'.$group.'_'.$id;
        }
        $root = $this->_cacheDir;
        if ($this->_hashedDirectoryLevel>0) {
            $hash = md5($suffix);
            for ($i=0 ; $i<$this->_hashedDirectoryLevel ; $i++) {
                $root = $root . 'cache_' . substr($hash, 0, $i + 1) . '/';
            }   
        }
        $this->_fileName = $suffix;
        $this->_file = $root.$suffix;
    }
    
    /**
    * Read the cache file and return the content
    *
    * @return string content of the cache file (else : false or a PEAR_Error object)
    * @access private
    */
    function _read()
    {
        $fp = @fopen($this->_file, "rb");
        if ($fp) {
	    if ($this->_fileLocking) @flock($fp, LOCK_SH);
            clearstatcache();
            $length = @filesize($this->_file);
            $mqr = get_magic_quotes_runtime();
            if ($mqr) {
                set_magic_quotes_runtime(0);
            }
            if ($this->_readControl) {
                $hashControl = @fread($fp, 32);
                $length = $length - 32;
            }

            if ($length) {
                $data = '';
                // See https://bugs.php.net/bug.php?id=30936
                // The 8192 magic number is the chunk size used internally by PHP.
                while(!feof($fp)) $data .= fread($fp, 8192);
            } else {
                $data = '';
            }
            if ($mqr) {
                set_magic_quotes_runtime($mqr);
            }
            if ($this->_fileLocking) @flock($fp, LOCK_UN);
            @fclose($fp);
            if ($this->_readControl) {
                $hashData = $this->_hash($data, $this->_readControlType);
                if ($hashData != $hashControl) {
                    if (!(is_null($this->_lifeTime))) {
                        @touch($this->_file, time() - 2*abs($this->_lifeTime)); 
                    } else {
                        @unlink($this->_file);
                    }
                    return false;
                }
            }
            return $data;
        }
        return $this->raiseError('Cache_Lite : Unable to read cache !', -2); 
    }
    
    /**
    * Write the given data in the cache file
    *
    * @param string $data data to put in cache
    * @return boolean true if ok (a PEAR_Error object else)
    * @access private
    */
    function _write($data)
    {
        if ($this->_hashedDirectoryLevel > 0) {
            $hash = md5($this->_fileName);
            $root = $this->_cacheDir;
            for ($i=0 ; $i<$this->_hashedDirectoryLevel ; $i++) {
                $root = $root . 'cache_' . substr($hash, 0, $i + 1) . '/';
                if (!(@is_dir($root))) {
                    @mkdir($root, $this->_hashedDirectoryUmask);
                }
            }
        }
        $fp = @fopen($this->_file, "wb");
        if ($fp) {
            if ($this->_fileLocking) @flock($fp, LOCK_EX);
            if ($this->_readControl) {
                @fwrite($fp, $this->_hash($data, $this->_readControlType), 32);
            }
            $mqr = get_magic_quotes_runtime();
            if ($mqr) {
                set_magic_quotes_runtime(0);
            }
            @fwrite($fp, $data);
            if ($mqr) {
                set_magic_quotes_runtime($mqr);
            }
            if ($this->_fileLocking) @flock($fp, LOCK_UN);
            @fclose($fp);
            return true;
        }      
        return $this->raiseError('Cache_Lite : Unable to write cache file : '.$this->_file, -1);
    }
       
    /**
    * Write the given data in the cache file and control it just after to avoir corrupted cache entries
    *
    * @param string $data data to put in cache
    * @return boolean true if the test is ok (else : false or a PEAR_Error object)
    * @access private
    */
    function _writeAndControl($data)
    {
        $result = $this->_write($data);
        if (is_object($result)) {
            return $result; # We return the PEAR_Error object
        }
        $dataRead = $this->_read();
        if (is_object($dataRead)) {
            return $dataRead; # We return the PEAR_Error object
        }
        if ((is_bool($dataRead)) && (!$dataRead)) {
            return false; 
        }
        return ($dataRead==$data);
    }
    
    /**
    * Make a control key with the string containing datas
    *
    * @param string $data data
    * @param string $controlType type of control 'md5', 'crc32' or 'strlen'
    * @return string control key
    * @access private
    */
    function _hash($data, $controlType)
    {
        switch ($controlType) {
        case 'md5':
            return md5($data);
        case 'crc32':
            return sprintf('% 32d', crc32($data));
        case 'strlen':
            return sprintf('% 32d', strlen($data));
        default:
            return $this->raiseError('Unknown controlType ! (available values are only \'md5\', \'crc32\', \'strlen\')', -5);
        }
    }
    
}