Corrupt file download

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February 27th, 2013, 12:52 PM

bazianm

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Corrupt file download

Hi,

I have a situation and I can't figure it out. Any assistance appreciated.

I have files on my site where the names have been overwritten with a hash string. For example, when uploaded the file may have been "mydoc.pdf" but it is stored as '19a71ff8-810e-11e2-89b8-73e31de31bdf' (a uuid).

Now, I need to retrieve the file when the user requests it:

PHP Code:


		
			
 header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // some day in the past to avoid cached files

header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");

//header("Content-Type: application/octet-stream");

header("Content-Type: " . $mimetype);

header("Content-Disposition: attachment; filename={$filename}");

header("Content-Transfer-Encoding: binary");

readfile($fileurl);

$filename is "afilename.pdf"
$mimetype is "application/pdf"
$fileurl is "/path/to/file/19a71ff8-810e-11e2-89b8-73e31de31bdf"

The file downloads but the PDF is corrupted; I cannot open it in Adobe. It definitely downloaded a file (it is larger than an error message and I checked the contents with a text editor).

Any ideas?

February 27th, 2013, 01:15 PM

ManiacDan

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Did it UPLOAD properly? Open it from the server directly.

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February 27th, 2013, 01:24 PM

bazianm

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Yes. I took a pdf and renamed it on the server with a UUID name and tried to download it. It came down corrupted. If I add the .PDF extension and open it (the web server is on my development machine), it opens just fine.

February 27th, 2013, 01:25 PM

ManiacDan

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Make the filename the UUID.pdf then, if that works.

February 27th, 2013, 01:42 PM

bazianm

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No difference. FIle works when I double click on it through windows, now when I download it.

Let me be clear. I have the file I will download in a file. It is referenced in a link on the site and I click on it and "download it". The original copy is fine, the downloaded copy is corrupted.

February 27th, 2013, 01:46 PM

ManiacDan

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Ok, so:

On your desktop: Valid.

Uploaded through your upload form: Valid (downloaded or accessed through a method other than your download form)

Through your download form: Invalid

Is that accurate?

Have you compared the good file to the bad one? Are they the same size? Do they appear the same when you open them in a text editor? Have you tried to change the file extension on the "corrupt" file to .pdf by hand?

February 27th, 2013, 06:00 PM

bazianm

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I figured it out.

I had two different problems masking as one.

In the first case, I was trying to download files that were corrupted. When I took one of THOSE, added a .PDF to it the file was corrupted.

The problem with the other files (the ones I tested and worked), there was an errant " (double quote) in the file name.

Thanks for your assistance

Corrupt file download

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