File download Resume Capability in PHP

[micromaster]

Hi I have a download php script and its working really good.

but i have one problem . that my downloads are not resumable.. and download speed is kind of week.

Here Is my PHP Code

 

.........................

 

<?php

include("./config.php");

include("./lang/$language.php");

$bans=file("./secure/bans.mfh");

foreach($bans as $line)

{

  if ($line==$_SERVER['REMOTE_ADDR']){

?> <center><table style="margin-top:0px;width:790px;height:400px;"><tr><td style="border:1px #AAAAAA solid;height:100%;background-color:#FFFFFF;padding:20px;text-align:left;" valign=top> <?

    echo "$lang[younallow]";

?></center></td></tr></table><p style="margin:3px;text-align:center"><?

    include("./footer.php");

    die();

  }

}

 

if(!isset($_GET['a']) || !isset($_GET['b']))

{

  echo "<script>window.location = '".$scripturl."';</script>";

}

 

$validdownload = 0;

$fileLocation = './storage/';

 

 

 

 

$filecrc = $_GET['a'];

$filecrctxt = $filecrc.".mfh";

if (file_exists("./files/".$filecrctxt)) {

$fh = fopen ("./files/".$filecrctxt,r);

$thisline= explode('|', fgets($fh));

if ($thisline[0]==$_GET['a'] && md5($thisline[2].$_SERVER['REMOTE_ADDR'])==$_GET['b'])

$validdownload=$thisline;

fclose($fh);

}

if($validdownload==0) {

?> <center><table style="margin-top:0px;width:790px;height:400px;"><tr><td style="border:1px #AAAAAA solid;height:100%;background-color:#FFFFFF;padding:20px;text-align:left;" valign=top>

<?

    echo "<center>$lang[inlink]</center>";

?></center></td></tr></table><p style="margin:3px;text-align:center"><?

    include("./footer.php");

    die();

}

 

$userip = $_SERVER['REMOTE_ADDR'];

$time = time();

 

$filesize = filesize("./storage/".$validdownload[0]);

$filesize = $filesize / 1048576;

 

if($filesize > $nolimitsize)

{

$newfile = "./downloader/".$userip.".mfh";

$f=fopen($newfile, "w");

fwrite ($f,$userip."|".$time."|");

fclose($f);

chmod($newfile,0777);

}

 

 

$validdownload[4] = time();

 

session_start();

if(isset($_SESSION['logged_in']) && $_SESSION['logged_in']==md5(md5($adminpass))) {

}

else {

 

// begin separate file mod

$newfile = "./files/$filecrc" . ".mfh";

$f=fopen($newfile, "w");

fwrite ($f,$validdownload[0]."|". $validdownload[1]."|". $validdownload[2]."|". $validdownload[3]."|". $validdownload[4]."|".($validdownload[5]+1)."|".$validdownload[6]."|".$validdownload[7]."|".$validdownload[8]."|\n");

fclose($f);

// end separate file mod

}

 

$speed = $dlspeed; // in Kb

header("Cache-control: private");

header('Content-type: application/force-download');

header('Content-Length: ' . filesize("./storage/".$validdownload[0]));

header('Content-Disposition: attachment; filename="'.$validdownload[1].'"');

 

if (!$minfile = fopen($fileLocation. $validdownload[0], 'r')) {

    exit;

}

while (!feof($minfile)) {

    echo fread($minfile, $speed * 1024);

    flush();

    sleep(1);

}

fclose($f);

 

?>

 

..............................

 

I need Help in making downloads from this script to be resumable...

Thanks in advance