Multiple file upload from archive supporting RANGE requests

Sometimes it is useful not to save a bunch of files on any hosting, but to use only one archive file. But there is a problem of access to a specific file in the archive. I bring to your attention a PHP script that allows you to download part of the archive file as a whole file. Supports reloading through RANGE requests. An archive, in this case, is simply a gluing of many files. The script is currently tested with the Flashget download manager.

In order to download a specific file, it is enough to indicate its offset in the archive file, the size and name of this file as follows:

htp: //address/script_name.php? Name = filename & offset = 3000 & size = 100

As a result, the user of such a link will receive a file of 100 bytes in size named filename, which is located at an offset of 3000 archive file.

Copy Source | Copy HTML

2. $offset = isset($_REQUEST['offset']) ? (int) $_REQUEST['offset'] : 0;
3. $size = isset($_REQUEST['size']) ? (int) $_REQUEST['size'] : false;
4. $name = isset($_REQUEST['name']) ? urlencode($_REQUEST['name']) : 'download.bin';
5.  
6. if (empty($size)) die;
7.  
8. // link to archive file
9. $url = 'http://archive_file_url';
10.  
11. @set_time_limit(0);
12.  
13. $range_size = $size;
14. $range_offset = $offset;
15.  
16. if (isset($_SERVER['HTTP_RANGE'])) {
17.     if (preg_match('/^bytes=(\d+)\-$/', $_SERVER['HTTP_RANGE'], $m)) {
18.         $range_offset+=$m[1];
19.         $range_size-=$m[1];
20.     } elseif (preg_match('/^bytes=(\d+)\-(\d+)$/',$_SERVER['HTTP_RANGE'], $m)) {
21.         $range_offset+=$m[1];
22.         $range_size=$m[2]-$m[1]+1;
23.     } else {
24.       // TODO (aig): support other ranges if needed
25.         die();
26.     }
27.     header('HTTP/1.1 206 Partial Content');
28. } else {
29.     header('HTTP/1.1 200 Ok');
30. }
31.  
32. $range = ($range_offset)."-".($range_offset+$range_size-1);
33. header("Content-Type: application/octet-stream");
34. header("Accept-Ranges: bytes");
35. header("Content-Length: $range_size");
36. header('Content-Disposition: attachment; filename="' . $name . '";');
37.  
38. $ch = curl_init();
39. curl_setopt($ch,CURLOPT_URL,$url);
40. curl_setopt($ch,CURLOPT_RANGE,$range);
41. curl_setopt($ch,CURLOPT_RETURNTRANSFER,0);
42. curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
43. curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3');
44. curl_exec($ch);
45. curl_close($ch);
46. ?>
47.