[PHP] odd acrobat reaction to streaming files

[Scott Taylor]

I have been using a php file to stream pdf (and various other sorts of 
files)... Here's my code.

<?php
           if         ($extension == ".doc"){$type = "application/msword";}
           else if ($extension == ".pdf"){$type = "application/pdf";}
           else if ($extension == ".exe"){$type = 
"application/octet-stream";}
           else if ($extension == ".ppt"){$type = 
"application/vnd.ms-powerpoint";}
           else if ($extension == ".xls"){$type = 
"application/vnd.ms-excel";}
           else if ($extension == ".xml"){$type = "text/xml";}
           else if ($extension == ".zip"){$type = "application/zip";}
           else if ($extension == ".txt"){$type = "text/plain";}
           else {
               $type="application/octet-stream";
           }

           header("Content-type: " . $type);
           header("Accept-Ranges: bytes");
           header("Content-Length: ".filesize($file));
           readfile($file);           
?>

And so this worked perfectly well when I did something like this:  
loadfile.php?file=name.pdf (where name.pdf is the file I am loading and 
loadfile.php is the name of the script).  But 
loadfile.php?file=directory/name.pdf (when launching Adobe acrobat) 
would give me the error 'File Does not begin with '%PDF' ".

I was able to add this header line:

   header("Content-Disposition: attachment; 
filename=".basename($file).";");           

which forced the user to be prompted if he wanted acrobat to be loaded 
or to save the file.  Both options worked flawlessly. 

So why did it not work before I added this header line?  Is it a flaw in 
Adobe Acrobat?

Best Regards,

Scott Taylor

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