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- 27.10.2014
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functions_compress.php
001 <?php
002 /**
003 *
004 * This file is part of the phpBB Forum Software package.
005 *
006 * @copyright (c) phpBB Limited <https://www.phpbb.com>
007 * @license GNU General Public License, version 2 (GPL-2.0)
008 *
009 * For full copyright and license information, please see
010 * the docs/CREDITS.txt file.
011 *
012 */
013
014 /**
015 * @ignore
016 */
017 if (!defined('IN_PHPBB'))
018 {
019 exit;
020 }
021
022 /**
023 * Class for handling archives (compression/decompression)
024 */
025 class compress
026 {
027 var $fp = 0;
028
029 /**
030 * @var array
031 */
032 protected $filelist = array();
033
034 /**
035 * Add file to archive
036 */
037 function add_file($src, $src_rm_prefix = '', $src_add_prefix = '', $skip_files = '')
038 {
039 global $phpbb_root_path;
040
041 $skip_files = explode(',', $skip_files);
042
043 // Remove rm prefix from src path
044 $src_path = ($src_rm_prefix) ? preg_replace('#^(' . preg_quote($src_rm_prefix, '#') . ')#', '', $src) : $src;
045 // Add src prefix
046 $src_path = ($src_add_prefix) ? ($src_add_prefix . ((substr($src_add_prefix, -1) != '/') ? '/' : '') . $src_path) : $src_path;
047 // Remove initial "/" if present
048 $src_path = (substr($src_path, 0, 1) == '/') ? substr($src_path, 1) : $src_path;
049
050 if (is_file($phpbb_root_path . $src))
051 {
052 $this->data($src_path, file_get_contents("$phpbb_root_path$src"), stat("$phpbb_root_path$src"), false);
053 }
054 else if (is_dir($phpbb_root_path . $src))
055 {
056 // Clean up path, add closing / if not present
057 $src_path = ($src_path && substr($src_path, -1) != '/') ? $src_path . '/' : $src_path;
058
059 $filelist = array();
060 $filelist = filelist("$phpbb_root_path$src", '', '*');
061 krsort($filelist);
062
063 /**
064 * Commented out, as adding the folders produces corrupted archives
065 if ($src_path)
066 {
067 $this->data($src_path, '', true, stat("$phpbb_root_path$src"));
068 }
069 */
070
071 foreach ($filelist as $path => $file_ary)
072 {
073 /**
074 * Commented out, as adding the folders produces corrupted archives
075 if ($path)
076 {
077 // Same as for src_path
078 $path = (substr($path, 0, 1) == '/') ? substr($path, 1) : $path;
079 $path = ($path && substr($path, -1) != '/') ? $path . '/' : $path;
080
081 $this->data("$src_path$path", '', true, stat("$phpbb_root_path$src$path"));
082 }
083 */
084
085 foreach ($file_ary as $file)
086 {
087 if (in_array($path . $file, $skip_files))
088 {
089 continue;
090 }
091
092 $this->data("$src_path$path$file", file_get_contents("$phpbb_root_path$src$path$file"), stat("$phpbb_root_path$src$path$file"), false);
093 }
094 }
095 }
096 else
097 {
098 // $src does not exist
099 return false;
100 }
101
102 return true;
103 }
104
105 /**
106 * Add custom file (the filepath will not be adjusted)
107 */
108 function add_custom_file($src, $filename)
109 {
110 if (!file_exists($src))
111 {
112 return false;
113 }
114
115 $this->data($filename, file_get_contents($src), stat($src), false);
116 return true;
117 }
118
119 /**
120 * Add file data
121 */
122 function add_data($src, $name)
123 {
124 $stat = array();
125 $stat[2] = 436; //384
126 $stat[4] = $stat[5] = 0;
127 $stat[7] = strlen($src);
128 $stat[9] = time();
129 $this->data($name, $src, $stat, false);
130 return true;
131 }
132
133 /**
134 * Checks if a file by that name as already been added and, if it has,
135 * returns a new, unique name.
136 *
137 * @param string $name The filename
138 * @return string A unique filename
139 */
140 protected function unique_filename($name)
141 {
142 if (isset($this->filelist[$name]))
143 {
144 $start = $name;
145 $ext = '';
146 $this->filelist[$name]++;
147
148 // Separate the extension off the end of the filename to preserve it
149 $pos = strrpos($name, '.');
150 if ($pos !== false)
151 {
152 $start = substr($name, 0, $pos);
153 $ext = substr($name, $pos);
154 }
155
156 return $start . '_' . $this->filelist[$name] . $ext;
157 }
158
159 $this->filelist[$name] = 0;
160 return $name;
161 }
162
163 /**
164 * Return available methods
165 *
166 * @return array Array of strings of available compression methods (.tar, .tar.gz, .zip, etc.)
167 */
168 static public function methods()
169 {
170 $methods = array('.tar');
171 $available_methods = array('.tar.gz' => 'zlib', '.tar.bz2' => 'bz2', '.zip' => 'zlib');
172
173 foreach ($available_methods as $type => $module)
174 {
175 if (!@extension_loaded($module))
176 {
177 continue;
178 }
179 $methods[] = $type;
180 }
181
182 return $methods;
183 }
184 }
185
186 /**
187 * Zip creation class from phpMyAdmin 2.3.0 (c) Tobias Ratschiller, Olivier M�ller, Lo�c Chapeaux,
188 * Marc Delisle, http://www.phpmyadmin.net/
189 *
190 * Zip extraction function by Alexandre Tedeschi, alexandrebr at gmail dot com
191 *
192 * Modified extensively by psoTFX and DavidMJ, (c) phpBB Limited, 2003
193 *
194 * Based on work by Eric Mueller and Denis125
195 * Official ZIP file format: http://www.pkware.com/appnote.txt
196 */
197 class compress_zip extends compress
198 {
199 var $datasec = array();
200 var $ctrl_dir = array();
201 var $eof_cdh = "\x50\x4b\x05\x06\x00\x00\x00\x00";
202
203 var $old_offset = 0;
204 var $datasec_len = 0;
205
206 /**
207 * Constructor
208 */
209 function compress_zip($mode, $file)
210 {
211 $this->fp = @fopen($file, $mode . 'b');
212
213 if (!$this->fp)
214 {
215 trigger_error('Unable to open file ' . $file . ' [' . $mode . 'b]');
216 }
217 }
218
219 /**
220 * Convert unix to dos time
221 */
222 function unix_to_dos_time($time)
223 {
224 $timearray = (!$time) ? getdate() : getdate($time);
225
226 if ($timearray['year'] < 1980)
227 {
228 $timearray['year'] = 1980;
229 $timearray['mon'] = $timearray['mday'] = 1;
230 $timearray['hours'] = $timearray['minutes'] = $timearray['seconds'] = 0;
231 }
232
233 return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
234 }
235
236 /**
237 * Extract archive
238 */
239 function extract($dst)
240 {
241 // Loop the file, looking for files and folders
242 $dd_try = false;
243 rewind($this->fp);
244
245 while (!feof($this->fp))
246 {
247 // Check if the signature is valid...
248 $signature = fread($this->fp, 4);
249
250 switch ($signature)
251 {
252 // 'Local File Header'
253 case "\x50\x4b\x03\x04":
254 // Lets get everything we need.
255 // We don't store the version needed to extract, the general purpose bit flag or the date and time fields
256 $data = unpack("@4/vc_method/@10/Vcrc/Vc_size/Vuc_size/vname_len/vextra_field", fread($this->fp, 26));
257 $file_name = fread($this->fp, $data['name_len']); // filename
258
259 if ($data['extra_field'])
260 {
261 fread($this->fp, $data['extra_field']); // extra field
262 }
263
264 $target_filename = "$dst$file_name";
265
266 if (!$data['uc_size'] && !$data['crc'] && substr($file_name, -1, 1) == '/')
267 {
268 if (!is_dir($target_filename))
269 {
270 $str = '';
271 $folders = explode('/', $target_filename);
272
273 // Create and folders and subfolders if they do not exist
274 foreach ($folders as $folder)
275 {
276 $folder = trim($folder);
277 if (!$folder)
278 {
279 continue;
280 }
281
282 $str = (!empty($str)) ? $str . '/' . $folder : $folder;
283 if (!is_dir($str))
284 {
285 if (!@mkdir($str, 0777))
286 {
287 trigger_error("Could not create directory $folder");
288 }
289 phpbb_chmod($str, CHMOD_READ | CHMOD_WRITE);
290 }
291 }
292 }
293 // This is a directory, we are not writting files
294 continue;
295 }
296 else
297 {
298 // Some archivers are punks, they don't include folders in their archives!
299 $str = '';
300 $folders = explode('/', pathinfo($target_filename, PATHINFO_DIRNAME));
301
302 // Create and folders and subfolders if they do not exist
303 foreach ($folders as $folder)
304 {
305 $folder = trim($folder);
306 if (!$folder)
307 {
308 continue;
309 }
310
311 $str = (!empty($str)) ? $str . '/' . $folder : $folder;
312 if (!is_dir($str))
313 {
314 if (!@mkdir($str, 0777))
315 {
316 trigger_error("Could not create directory $folder");
317 }
318 phpbb_chmod($str, CHMOD_READ | CHMOD_WRITE);
319 }
320 }
321 }
322
323 if (!$data['uc_size'])
324 {
325 $content = '';
326 }
327 else
328 {
329 $content = fread($this->fp, $data['c_size']);
330 }
331
332 $fp = fopen($target_filename, "w");
333
334 switch ($data['c_method'])
335 {
336 case 0:
337 // Not compressed
338 fwrite($fp, $content);
339 break;
340
341 case 8:
342 // Deflate
343 fwrite($fp, gzinflate($content, $data['uc_size']));
344 break;
345
346 case 12:
347 // Bzip2
348 fwrite($fp, bzdecompress($content));
349 break;
350 }
351
352 fclose($fp);
353 break;
354
355 // We hit the 'Central Directory Header', we can stop because nothing else in here requires our attention
356 // or we hit the end of the central directory record, we can safely end the loop as we are totally finished with looking for files and folders
357 case "\x50\x4b\x01\x02":
358 // This case should simply never happen.. but it does exist..
359 case "\x50\x4b\x05\x06":
360 break 2;
361
362 // 'Packed to Removable Disk', ignore it and look for the next signature...
363 case 'PK00':
364 continue 2;
365
366 // We have encountered a header that is weird. Lets look for better data...
367 default:
368 if (!$dd_try)
369 {
370 // Unexpected header. Trying to detect wrong placed 'Data Descriptor';
371 $dd_try = true;
372 fseek($this->fp, 8, SEEK_CUR); // Jump over 'crc-32'(4) 'compressed-size'(4), 'uncompressed-size'(4)
373 continue 2;
374 }
375 trigger_error("Unexpected header, ending loop");
376 break 2;
377 }
378
379 $dd_try = false;
380 }
381 }
382
383 /**
384 * Close archive
385 */
386 function close()
387 {
388 // Write out central file directory and footer ... if it exists
389 if (sizeof($this->ctrl_dir))
390 {
391 fwrite($this->fp, $this->file());
392 }
393 fclose($this->fp);
394 }
395
396 /**
397 * Create the structures ... note we assume version made by is MSDOS
398 */
399 function data($name, $data, $stat, $is_dir = false)
400 {
401 $name = str_replace('\\', '/', $name);
402 $name = $this->unique_filename($name);
403
404 $hexdtime = pack('V', $this->unix_to_dos_time($stat[9]));
405
406 if ($is_dir)
407 {
408 $unc_len = $c_len = $crc = 0;
409 $zdata = '';
410 $var_ext = 10;
411 }
412 else
413 {
414 $unc_len = strlen($data);
415 $crc = crc32($data);
416 $zdata = gzdeflate($data);
417 $c_len = strlen($zdata);
418 $var_ext = 20;
419
420 // Did we compress? No, then use data as is
421 if ($c_len >= $unc_len)
422 {
423 $zdata = $data;
424 $c_len = $unc_len;
425 $var_ext = 10;
426 }
427 }
428 unset($data);
429
430 // If we didn't compress set method to store, else deflate
431 $c_method = ($c_len == $unc_len) ? "\x00\x00" : "\x08\x00";
432
433 // Are we a file or a directory? Set archive for file
434 $attrib = ($is_dir) ? 16 : 32;
435
436 // File Record Header
437 $fr = "\x50\x4b\x03\x04"; // Local file header 4bytes
438 $fr .= pack('v', $var_ext); // ver needed to extract 2bytes
439 $fr .= "\x00\x00"; // gen purpose bit flag 2bytes
440 $fr .= $c_method; // compression method 2bytes
441 $fr .= $hexdtime; // last mod time and date 2+2bytes
442 $fr .= pack('V', $crc); // crc32 4bytes
443 $fr .= pack('V', $c_len); // compressed filesize 4bytes
444 $fr .= pack('V', $unc_len); // uncompressed filesize 4bytes
445 $fr .= pack('v', strlen($name));// length of filename 2bytes
446
447 $fr .= pack('v', 0); // extra field length 2bytes
448 $fr .= $name;
449 $fr .= $zdata;
450 unset($zdata);
451
452 $this->datasec_len += strlen($fr);
453
454 // Add data to file ... by writing data out incrementally we save some memory
455 fwrite($this->fp, $fr);
456 unset($fr);
457
458 // Central Directory Header
459 $cdrec = "\x50\x4b\x01\x02"; // header 4bytes
460 $cdrec .= "\x00\x00"; // version made by
461 $cdrec .= pack('v', $var_ext); // version needed to extract
462 $cdrec .= "\x00\x00"; // gen purpose bit flag
463 $cdrec .= $c_method; // compression method
464 $cdrec .= $hexdtime; // last mod time & date
465 $cdrec .= pack('V', $crc); // crc32
466 $cdrec .= pack('V', $c_len); // compressed filesize
467 $cdrec .= pack('V', $unc_len); // uncompressed filesize
468 $cdrec .= pack('v', strlen($name)); // length of filename
469 $cdrec .= pack('v', 0); // extra field length
470 $cdrec .= pack('v', 0); // file comment length
471 $cdrec .= pack('v', 0); // disk number start
472 $cdrec .= pack('v', 0); // internal file attributes
473 $cdrec .= pack('V', $attrib); // external file attributes
474 $cdrec .= pack('V', $this->old_offset); // relative offset of local header
475 $cdrec .= $name;
476
477 // Save to central directory
478 $this->ctrl_dir[] = $cdrec;
479
480 $this->old_offset = $this->datasec_len;
481 }
482
483 /**
484 * file
485 */
486 function file()
487 {
488 $ctrldir = implode('', $this->ctrl_dir);
489
490 return $ctrldir . $this->eof_cdh .
491 pack('v', sizeof($this->ctrl_dir)) . // total # of entries "on this disk"
492 pack('v', sizeof($this->ctrl_dir)) . // total # of entries overall
493 pack('V', strlen($ctrldir)) . // size of central dir
494 pack('V', $this->datasec_len) . // offset to start of central dir
495 "\x00\x00"; // .zip file comment length
496 }
497
498 /**
499 * Download archive
500 */
501 function download($filename, $download_name = false)
502 {
503 global $phpbb_root_path;
504
505 if ($download_name === false)
506 {
507 $download_name = $filename;
508 }
509
510 $mimetype = 'application/zip';
511
512 header('Cache-Control: private, no-cache');
513 header("Content-Type: $mimetype; name=\"$download_name.zip\"");
514 header("Content-disposition: attachment; filename=$download_name.zip");
515
516 $fp = @fopen("{$phpbb_root_path}store/$filename.zip", 'rb');
517 if ($fp)
518 {
519 while ($buffer = fread($fp, 1024))
520 {
521 echo $buffer;
522 }
523 fclose($fp);
524 }
525 }
526 }
527
528 /**
529 * Tar/tar.gz compression routine
530 * Header/checksum creation derived from tarfile.pl, (c) Tom Horsley, 1994
531 */
532 class compress_tar extends compress
533 {
534 var $isgz = false;
535 var $isbz = false;
536 var $filename = '';
537 var $mode = '';
538 var $type = '';
539 var $wrote = false;
540
541 /**
542 * Constructor
543 */
544 function compress_tar($mode, $file, $type = '')
545 {
546 $type = (!$type) ? $file : $type;
547 $this->isgz = preg_match('#(\.tar\.gz|\.tgz)$#', $type);
548 $this->isbz = preg_match('#\.tar\.bz2$#', $type);
549
550 $this->mode = &$mode;
551 $this->file = &$file;
552 $this->type = &$type;
553 $this->open();
554 }
555
556 /**
557 * Extract archive
558 */
559 function extract($dst)
560 {
561 $fzread = ($this->isbz && function_exists('bzread')) ? 'bzread' : (($this->isgz && @extension_loaded('zlib')) ? 'gzread' : 'fread');
562
563 // Run through the file and grab directory entries
564 while ($buffer = $fzread($this->fp, 512))
565 {
566 $tmp = unpack('A6magic', substr($buffer, 257, 6));
567
568 if (trim($tmp['magic']) == 'ustar')
569 {
570 $tmp = unpack('A100name', $buffer);
571 $filename = trim($tmp['name']);
572
573 $tmp = unpack('Atype', substr($buffer, 156, 1));
574 $filetype = (int) trim($tmp['type']);
575
576 $tmp = unpack('A12size', substr($buffer, 124, 12));
577 $filesize = octdec((int) trim($tmp['size']));
578
579 $target_filename = "$dst$filename";
580
581 if ($filetype == 5)
582 {
583 if (!is_dir($target_filename))
584 {
585 $str = '';
586 $folders = explode('/', $target_filename);
587
588 // Create and folders and subfolders if they do not exist
589 foreach ($folders as $folder)
590 {
591 $folder = trim($folder);
592 if (!$folder)
593 {
594 continue;
595 }
596
597 $str = (!empty($str)) ? $str . '/' . $folder : $folder;
598 if (!is_dir($str))
599 {
600 if (!@mkdir($str, 0777))
601 {
602 trigger_error("Could not create directory $folder");
603 }
604 phpbb_chmod($str, CHMOD_READ | CHMOD_WRITE);
605 }
606 }
607 }
608 }
609 else if ($filesize >= 0 && ($filetype == 0 || $filetype == "\0"))
610 {
611 // Some archivers are punks, they don't properly order the folders in their archives!
612 $str = '';
613 $folders = explode('/', pathinfo($target_filename, PATHINFO_DIRNAME));
614
615 // Create and folders and subfolders if they do not exist
616 foreach ($folders as $folder)
617 {
618 $folder = trim($folder);
619 if (!$folder)
620 {
621 continue;
622 }
623
624 $str = (!empty($str)) ? $str . '/' . $folder : $folder;
625 if (!is_dir($str))
626 {
627 if (!@mkdir($str, 0777))
628 {
629 trigger_error("Could not create directory $folder");
630 }
631 phpbb_chmod($str, CHMOD_READ | CHMOD_WRITE);
632 }
633 }
634
635 // Write out the files
636 if (!($fp = fopen($target_filename, 'wb')))
637 {
638 trigger_error("Couldn't create file $filename");
639 }
640 phpbb_chmod($target_filename, CHMOD_READ);
641
642 // Grab the file contents
643 fwrite($fp, ($filesize) ? $fzread($this->fp, ($filesize + 511) &~ 511) : '', $filesize);
644 fclose($fp);
645 }
646 }
647 }
648 }
649
650 /**
651 * Close archive
652 */
653 function close()
654 {
655 $fzclose = ($this->isbz && function_exists('bzclose')) ? 'bzclose' : (($this->isgz && @extension_loaded('zlib')) ? 'gzclose' : 'fclose');
656
657 if ($this->wrote)
658 {
659 $fzwrite = ($this->isbz && function_exists('bzwrite')) ? 'bzwrite' : (($this->isgz && @extension_loaded('zlib')) ? 'gzwrite' : 'fwrite');
660
661 // The end of a tar archive ends in two records of all NULLs (1024 bytes of \0)
662 $fzwrite($this->fp, str_repeat("\0", 1024));
663 }
664
665 $fzclose($this->fp);
666 }
667
668 /**
669 * Create the structures
670 */
671 function data($name, $data, $stat, $is_dir = false)
672 {
673 $name = $this->unique_filename($name);
674 $this->wrote = true;
675 $fzwrite = ($this->isbz && function_exists('bzwrite')) ? 'bzwrite' : (($this->isgz && @extension_loaded('zlib')) ? 'gzwrite' : 'fwrite');
676
677 $typeflag = ($is_dir) ? '5' : '';
678
679 // This is the header data, it contains all the info we know about the file or folder that we are about to archive
680 $header = '';
681 $header .= pack('a100', $name); // file name
682 $header .= pack('a8', sprintf("%07o", $stat[2])); // file mode
683 $header .= pack('a8', sprintf("%07o", $stat[4])); // owner id
684 $header .= pack('a8', sprintf("%07o", $stat[5])); // group id
685 $header .= pack('a12', sprintf("%011o", $stat[7])); // file size
686 $header .= pack('a12', sprintf("%011o", $stat[9])); // last mod time
687
688 // Checksum
689 $checksum = 0;
690 for ($i = 0; $i < 148; $i++)
691 {
692 $checksum += ord($header[$i]);
693 }
694
695 // We precompute the rest of the hash, this saves us time in the loop and allows us to insert our hash without resorting to string functions
696 $checksum += 2415 + (($is_dir) ? 53 : 0);
697
698 $header .= pack('a8', sprintf("%07o", $checksum)); // checksum
699 $header .= pack('a1', $typeflag); // link indicator
700 $header .= pack('a100', ''); // name of linked file
701 $header .= pack('a6', 'ustar'); // ustar indicator
702 $header .= pack('a2', '00'); // ustar version
703 $header .= pack('a32', 'Unknown'); // owner name
704 $header .= pack('a32', 'Unknown'); // group name
705 $header .= pack('a8', ''); // device major number
706 $header .= pack('a8', ''); // device minor number
707 $header .= pack('a155', ''); // filename prefix
708 $header .= pack('a12', ''); // end
709
710 // This writes the entire file in one shot. Header, followed by data and then null padded to a multiple of 512
711 $fzwrite($this->fp, $header . (($stat[7] !== 0 && !$is_dir) ? $data . str_repeat("\0", (($stat[7] + 511) &~ 511) - $stat[7]) : ''));
712 unset($data);
713 }
714
715 /**
716 * Open archive
717 */
718 function open()
719 {
720 $fzopen = ($this->isbz && function_exists('bzopen')) ? 'bzopen' : (($this->isgz && @extension_loaded('zlib')) ? 'gzopen' : 'fopen');
721 $this->fp = @$fzopen($this->file, $this->mode . (($fzopen == 'bzopen') ? '' : 'b') . (($fzopen == 'gzopen') ? '9' : ''));
722
723 if (!$this->fp)
724 {
725 trigger_error('Unable to open file ' . $this->file . ' [' . $fzopen . ' - ' . $this->mode . 'b]');
726 }
727 }
728
729 /**
730 * Download archive
731 */
732 function download($filename, $download_name = false)
733 {
734 global $phpbb_root_path;
735
736 if ($download_name === false)
737 {
738 $download_name = $filename;
739 }
740
741 switch ($this->type)
742 {
743 case '.tar':
744 $mimetype = 'application/x-tar';
745 break;
746
747 case '.tar.gz':
748 $mimetype = 'application/x-gzip';
749 break;
750
751 case '.tar.bz2':
752 $mimetype = 'application/x-bzip2';
753 break;
754
755 default:
756 $mimetype = 'application/octet-stream';
757 break;
758 }
759
760 header('Cache-Control: private, no-cache');
761 header("Content-Type: $mimetype; name=\"$download_name$this->type\"");
762 header("Content-disposition: attachment; filename=$download_name$this->type");
763
764 $fp = @fopen("{$phpbb_root_path}store/$filename$this->type", 'rb');
765 if ($fp)
766 {
767 while ($buffer = fread($fp, 1024))
768 {
769 echo $buffer;
770 }
771 fclose($fp);
772 }
773 }
774 }
775