Download resume and zip file issue - PHP [duplicate] - php

Question

This question already has answers here:
PHP Remote file streaming with Resume Support
(3 answers)
Closed 9 years ago.
I'm really stuck with it. I made a function as below (a wp plugin). That handles download requests.
The download url format is like this:
http://mysite.com/?download=2f547re8w9qasd547g8tr52e15469879w
Files are going to be saved as usual (with that pop up "save as..." box) in browser.
The problem is that:
1 - a download manager like Orbit tries to download a page! and IDM just downloads a low percentage of whole file size (e.g. 7%) then stops & by resuming, it begins downloading from first. (browser downloads files completely and resumes without problem)
2 - when a .zip file is downloaded (by browser), has an "Unexpected end of archive" error. (CRC32 in zip file details shows 0 chars)
function save_file()
{
global $wpdb;
global $uid;
global $each_download;
$hash = #$_GET["download"];
if(preg_match('/^[a-z0-9]{32}$/i',$hash))
{
if($row = $wpdb->get_row("SELECT * FROM wp_dlurl WHERE hash = '{$hash}'",ARRAY_A))
{
if(is_user_logged_in())
{
if($row['price'] != 0)
$each_download = $row['price'];
if(get_user_meta($uid, 'revo_credits', true) >= $each_download)
{
$parts = pathinfo($row['url']);
$url = $parts['dirname'] . '/' . urlencode($parts['basename']);
$file = pathinfo($row['filename']);
$ext = $file['extension'];
/* List of File Types */
$fileTypes['swf'] = 'application/x-shockwave-flash';
$fileTypes['pdf'] = 'application/pdf';
$fileTypes['exe'] = 'application/octet-stream';
$fileTypes['zip'] = 'application/zip';
$fileTypes['doc'] = 'application/msword';
$fileTypes['xls'] = 'application/vnd.ms-excel';
$fileTypes['ppt'] = 'application/vnd.ms-powerpoint';
$fileTypes['gif'] = 'image/gif';
$fileTypes['png'] = 'image/png';
$fileTypes['jpeg'] = 'image/jpg';
$fileTypes['jpg'] = 'image/jpg';
$fileTypes['rar'] = 'application/rar';
$fileTypes['ra'] = 'audio/x-pn-realaudio';
$fileTypes['ram'] = 'audio/x-pn-realaudio';
$fileTypes['ogg'] = 'audio/x-pn-realaudio';
$fileTypes['wav'] = 'video/x-msvideo';
$fileTypes['wmv'] = 'video/x-msvideo';
$fileTypes['avi'] = 'video/x-msvideo';
$fileTypes['asf'] = 'video/x-msvideo';
$fileTypes['divx'] = 'video/x-msvideo';
$fileTypes['mp3'] = 'audio/mpeg';
$fileTypes['mp4'] = 'audio/mpeg';
$fileTypes['mpeg'] = 'video/mpeg';
$fileTypes['mpg'] = 'video/mpeg';
$fileTypes['mpe'] = 'video/mpeg';
$fileTypes['mov'] = 'video/quicktime';
$fileTypes['swf'] = 'video/quicktime';
$fileTypes['3gp'] = 'video/quicktime';
$fileTypes['m4a'] = 'video/quicktime';
$fileTypes['aac'] = 'video/quicktime';
$fileTypes['m3u'] = 'video/quicktime';
$contentType = $fileTypes[$ext];
//ob_end_clean();
header("Cache-Control: public");
header('Content-Type: $contentType');
header("Content-Transfer-Encoding: binary");
$new_name = $row['filename'];//rand(1000,999999).".".$ext;
$contentDisposition = 'attachment';
if(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
{
$new_name = preg_replace('/\./', '%2e', $new_name, substr_count($new_name,'.') - 1);
}
$new_name = urlencode($new_name);
header("Content-Disposition: $contentDisposition; filename=\"$new_name\"");
header("Accept-Ranges: bytes");
$range = 0;
$size = $row['size'];
if(isset($_SERVER['HTTP_RANGE']))
{
list($a, $range) = explode("=",$_SERVER['HTTP_RANGE']);
str_replace($range, "-", $range);
$size2 = $size-1;
$new_length = $size-$range;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range$size2/$size");
}
else
{
update_user_meta($uid, 'revo_credits', get_user_meta($uid, 'revo_credits', true)-$each_download);
$size2 = $size-1;
header("Content-Range: bytes 0-$size2/$size");
header("Content-Length: ".$size);
}
if ($size == 0)
{
showMessage('aborted. zero file size');
}
set_magic_quotes_runtime(0);
$maxSpeed = 200;
$fp = fopen($url,"rb");
fseek($fp,$range);
while(!feof($fp) and (connection_status()==0))
{
set_time_limit(0);
print(fread($fp,1024*$maxSpeed));
flush();
ob_flush();
sleep(1);
}
fclose($fp);
return((connection_status()==0) and !connection_aborted());
}
else
showMessage("not enough credit.");
}
else
showMessage("login to download.");
}
else
{
wp_redirect(get_bloginfo('url'));
exit;
}
}
else
{
wp_redirect(get_bloginfo('url'));
exit;
}
}
I think headers are the culprits!
Resuming method with Accept-ranges and Content-length headers are already done and works when file is downloading by browser.

Answer 1

Am not sure how other download works but your range implementation is wrong why ?
You are getting range like this
$_SERVER['HTTP_RANGE'] = "bytes=1-200"; //sample range
$size = 1000; //sample size
list($a, $range) = explode("=", $_SERVER['HTTP_RANGE']);
str_replace($range, "-", $range);
$size2 = $size - 1;
$new_length = $size - $range;
// Used Print Insted of headers
print("HTTP/1.1 206 Partial Content\n");
print("Content-Length: $new_length\n");
print("Content-Range: bytes $range$size2/$size\n");
Output
HTTP/1.1 206 Partial Content
Content-Length: 999
Content-Range: bytes 1-200999/1000 <------ This is an issue
I expect something like this
list($a, $range) = explode("=", $_SERVER['HTTP_RANGE']);
list($offset, $length) = explode("-", $range);
$length = $length - $offset;
// Used Print Insted of headers
print("HTTP/1.1 206 Partial Content\n");
print("Content-Length: $length\n");
printf('Content-Range: bytes %d-%d/%d', $offset, ($offset + $length), $size)
Output
HTTP/1.1 206 Partial Content
Content-Length: 199
Content-Range: bytes 1-200/1000 <---- Properly Displayed