PHP File Routing with Partial Download Support

Partial download requests are sent to the server as a header item. done: See comment entry by gaosipov at gmail dot com here: 09-Oct-2008 09:08

In case it gets removed from the site, i will be publishing it here:

< ?php
//this is a php file
function smartReadFile($location, $filename, $mimeType='application/octet-stream')
{ if(!file_exists($location))
  { header ("HTTP/1.0 404 Not Found");
    return;
  }
 
  $size=filesize($location);
  $time=date('r',filemtime($location));
 
  $fm=@fopen($location,'rb');
  if(!$fm)
  { header ("HTTP/1.0 505 Internal server error");
    return;
  }
 
  $begin=0;
  $end=$size;
 
  if(isset($_SERVER['HTTP_RANGE']))
  { if(preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches))
    { $begin=intval($matches[0]);
      if(!empty($matches[1]))
        $end=intval($matches[1]);
    }
  }
 
  if($begin>0||$end<$size)
    header('HTTP/1.0 206 Partial Content');
  else
    header('HTTP/1.0 200 OK'); 
 
  header("Content-Type: $mimeType");
  header('Cache-Control: public, must-revalidate, max-age=0');
  header('Pragma: no-cache'); 
  header('Accept-Ranges: bytes');
  header('Content-Length:'.($end-$begin));
  header("Content-Range: bytes $begin-$end/$size");
  header("Content-Disposition: inline; filename=$filename");
  header("Content-Transfer-Encoding: binary\n");
  header("Last-Modified: $time");
  header('Connection: close'); 
 
  $cur=$begin;
  fseek($fm,$begin,0);

  while(!feof($fm)&&$cur<$end&&(connection_status()==0))
  { print fread($fm,min(1024*16,$end-$cur));
    $cur+=1024*16;
  }
}
?>

Usage:

< ?php
smartReadFile("/tmp/filename","myfile.mp3","audio/mpeg")
?>