[eluser]Wilker[/eluser]
Hi all!
It's my first time in forum, and I come to collaborate with one improved version of force_download (in download helper)
this version have some great features:
- support to pause/resume downloads
- support segmented downloads
- support download speed limit
- improved performance for file downloads (preventing memory leaks with big files)
the signature is compatible with the current version, but you can use some different ways like:
force_download('server_file_path.zip')
this way the improved version is for files is called, and I add more 2 arguments:
force_download($filename = '', $data = false, $enable_partial = true, $speedlimit = 0)
if data is false, the scripts tries to open the filename in server
if enable_partial is true, the scripts accepts http_range protocol
if speed_limit is greater than zero, the script will limit the user download speed
here is the code:
Code:
function force_download($filename = '', $data = false, $enable_partial = true, $speedlimit = 0)
{
if ($filename == '')
{
return FALSE;
}
if($data === false && !file_exists($filename))
return FALSE;
// Try to determine if the filename includes a file extension.
// We need it in order to set the MIME type
if (FALSE === strpos($filename, '.'))
{
return FALSE;
}
// Grab the file extension
$x = explode('.', $filename);
$extension = end($x);
// Load the mime types
@include(APPPATH.'config/mimes'.EXT);
// Set a default mime if we can't find it
if ( ! isset($mimes[$extension]))
{
if (ereg('Opera(/| )([0-9].[0-9]{1,2})', $_SERVER['HTTP_USER_AGENT']))
$UserBrowser = "Opera";
elseif (ereg('MSIE ([0-9].[0-9]{1,2})', $_SERVER['HTTP_USER_AGENT']))
$UserBrowser = "IE";
else
$UserBrowser = '';
$mime = ($UserBrowser == 'IE' || $UserBrowser == 'Opera') ? 'application/octetstream' : 'application/octet-stream';
}
else
{
$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
}
$size = $data === false ? filesize($filename) : strlen($data);
if($data === false)
{
$info = pathinfo($filename);
$name = $info['basename'];
}
else
{
$name = $filename;
}
// Clean data in cache if exists
@ob_end_clean();
// Check for partial download
if(isset($_SERVER['HTTP_RANGE']) && $enable_partial)
{
list($a, $range) = explode("=", $_SERVER['HTTP_RANGE']);
list($fbyte, $lbyte) = explode("-", $range);
if(!$lbyte)
$lbyte = $size - 1;
$new_length = $lbyte - $fbyte;
header("HTTP/1.1 206 Partial Content", true);
header("Content-Length: $new_length", true);
header("Content-Range: bytes $fbyte-$lbyte/$size", true);
}
else
{
header("Content-Length: " . $size);
}
// Common headers
header('Content-Type: ' . $mime, true);
header('Content-Disposition: attachment; filename="' . $name . '"', true);
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT", true);
header('Accept-Ranges: bytes', true);
header("Cache-control: private", true);
header('Pragma: private', true);
// Open file
if($data === false) {
$file = fopen($filename, 'r');
if(!$file)
return FALSE;
}
// Cut data for partial download
if(isset($_SERVER['HTTP_RANGE']) && $enable_partial)
if($data === false)
fseek($file, $range);
else
$data = substr($data, $range);
// Disable script time limit
@set_time_limit(0);
// Check for speed limit or file optimize
if($speedlimit > 0 || $data === false)
{
if($data === false)
{
$chunksize = $speedlimit > 0 ? $speedlimit * 1024 : 512 * 1024;
while(!feof($file) and (connection_status() == 0))
{
$buffer = fread($file, $chunksize);
echo $buffer;
flush();
if($speedlimit > 0)
sleep(1);
}
fclose($file);
}
else
{
$index = 0;
$speedlimit *= 1024; //convert to kb
while($index < $size and (connection_status() == 0))
{
$left = $size - $index;
$buffersize = min($left, $speedlimit);
$buffer = substr($data, $index, $buffersize);
$index += $buffersize;
echo $buffer;
flush();
sleep(1);
}
}
}
else
{
echo $data;
}
}
I hope you like this version of force_download
I'm loving this framework and want to help ever I can
If it's possible, I really want this version of force_download is official in some future version of CodeIgniter
Thank you all
