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Download header cause zip file to be corrupt

Posted on 2008-10-23
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Last Modified: 2012-05-05
We are making a download manager application ...

Download header cause zip file to be corrupt

Please see the code below
header("Content-type: $mimeType");
		    header("Content-Transfer-Encoding: Binary");
		    header("Content-length: ".$size);
		    header("Content-disposition: attachment; filename=\"".$a['name']."\"");
		    readfile("$pathside");

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Question by:CalmSoul
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4 Comments
 
LVL 13

Expert Comment

by:Xyptilon2
ID: 22794001
Try this, it works for me:

<?PHP
$file = '/home/test/somefile.dat';

header('Content-Description: File Transfer');
header('Content-Type: application/force-download');
header('Content-Length: ' . filesize($file));
header('Content-Disposition: attachment; filename=' . basename($file));
?>
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LVL 25

Accepted Solution

by:
Marcus Bointon earned 2000 total points
ID: 22794338
Don't use application/force-download - it's a non-existent mime type and doesn't work for the reasons you think, and removes the ability of the user to handle the file type correctly (the user is always right). The correct MIME type for a zip file is application/zip. If you are going to include a filename in your content-disposition header, make sure it's correctly quoted and escaped. You don't need a transfer encoding header if it's just binary. Overall, this should work:
<?php
header("Content-Type: application/zip");
header("Content-Length: ".$size);
header("Content-Disposition: attachment; filename=\"".addslashes(basename($pathside))."\"");
readfile("$pathside");
?>

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LVL 13

Expert Comment

by:Xyptilon2
ID: 22794493
Here's a function for large files:

<?PHP

readfile_chunked($file);

function readfile_chunked($filename) {
 $chunksize = 1*(1024*1024); // how many bytes per chunk
 $buffer = '';
 $handle = fopen($filename, 'rb');
 if ($handle === false) {
   return false;
 }
 while (!feof($handle)) {

   // ***** Write output to client
   $buffer = fread($handle, $chunksize);
   print $buffer;
 }
 return fclose($handle);
}
?>
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LVL 25

Expert Comment

by:Marcus Bointon
ID: 22794614
So log as you don't have output buffering turned on (or you can turn it off on the fly), you shouldn't need to do that. PHP is built with mmap support by default which means it doesn't read the file into memory in order to send it - it just streams from disk to network. mmap and sendfile are also supported by apache, and are normally used for delivering all static files.
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