Download fails on files greater than 10M

[cesarcesar]

Using the following code, files greater than 10Megs do not download. Less than 10 is working. Can anyone explain why? Files that will be downloaded are 5G plus in size.

 

    function download() {

        global $_GET;

        //Gather relevent info about file
        $file = "/user/dac420/tts/incoming/".$_GET['name'];
        $len = filesize($file);
        $filename = basename($file);
        $file_extension = strtolower(substr(strrchr($filename,"."),1));

        // Determine correct MIME type
        switch($file_extension){

            case "asf":     $ctype = "video/x-ms-asf";                break;
            case "avi":     $ctype = "video/x-msvideo";               break;
            case "exe":     $ctype = "application/octet-stream";      break;
            case "mov":     $ctype = "video/quicktime";               break;
            case "mp3":     $ctype = "audio/mpeg";                    break;
            case "mpg":     $ctype = "video/mpeg";                    break;
            case "mpeg":    $ctype = "video/mpeg";                    break;
            case "rar":     $ctype = "encoding/x-compress";           break;
            case "txt":     $ctype = "text/plain";                    break;
            case "wav":     $ctype = "audio/wav";                     break;
            case "wma":     $ctype = "audio/x-ms-wma";                break;
            case "wmv":     $ctype = "video/x-ms-wmv";                break;
            case "zip":     $ctype = "application/x-zip-compressed";  break;
            default:        $ctype = "application/force-download";    break;

        }

        //Begin writing headers
        header("Cache-Control:");
        header("Cache-Control: public");

        //Use the switch-generated Content-Type
        header("Content-Type: $ctype");

        if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) {
            # workaround for IE filename bug with multiple periods / multiple dots in filename
            # that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe
            $iefilename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);
            header("Content-Disposition: attachment; filename=\"$iefilename\"");
        } else {
            header("Content-Disposition: attachment; filename=\"$filename\"");
        }

        header("Accept-Ranges: bytes");

        $size=filesize($file);

        //check if http_range is sent by browser (or download manager)
        if(isset($_SERVER['HTTP_RANGE'])) {

            list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);

            //if yes, download missing part
            str_replace($range, "-", $range);
            $size2=$size-1;
            $new_length=$size2-$range;

            header("HTTP/1.1 206 Partial Content");
            header("Content-Length: $new_length");
            header("Content-Range: bytes $range$size2/$size");

        } else {

            $size2=$size-1;
            header("Content-Range: bytes 0-$size2/$size");
            header("Content-Length: ".$size);

        }

        //open the file
        $fp=fopen("$file","rb");

        //seek to start of missing part
        fseek($fp,$range);

        //start buffered download
        while(!feof($fp)){

            //reset time limit for big files
            set_time_limit(0);

            print(fread($fp,filesize($file)));
            flush();
            ob_flush();

        }

        fclose($fp);
        exit;

    }

[cesarcesar]

The solution is to split the file into chunks when sending. Thanks to everyone for your suggestions.

 

replace the while() in my above code.

 

	//start buffered download
while(!feof($fp)){

	$total     = filesize($file);
	$sent      = 0;
	$blocksize = (2 << 20); //2M chunks
	$handle    = fopen($file, "r");

	// Now we need to loop through the file and echo out chunks of file data
	// Dumping the whole file fails at > 30M!
	while($sent < $total){
		echo fread($handle, $blocksize);
		$sent += $blocksize;
	}

	exit(0);
	@flush();
	@ob_flush();
}

[cesarcesar]

So now that I have the download working I need to know why the page is not refreshing at the end of the script. The download happen, then nothing. How do i get the page to continue after download?