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force_download() delivering incomplete ZIP files

#1
[eluser]AMC3[/eluser]
I'm trying to use force_download force the download of ZIP files around 100MB large. Every time it's downloaded, I only get some part of the file but never the whole thing. And, each time it's downloaded, I get different-sized parts of the ZIP (anywhere from about 50MB to 80MB). The ZIP cannot be uncompressed because it's incomplete.
The PHP is getting the correct file size and passing that to the browsers because when it's downloading, the download window shows some percentage of the correct file size.

Code:
function force_download($filename = '', $data = false, $enable_partial = false, $speedlimit = 0)
    {
        if ($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];
        }
        

        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;
        }
    }


force_download('downloadpackages/' . $album . '.zip');

Per others' suggestions on this site, I tried replacing this line
Code:
$size = $data === false ? filesize($filename) : strlen($data);
with
Code:
$size = strlen($data);
but that only resulted in the browser not knowing the file size (showing some percentage of an unknown file size in the download window). The downloaded ZIP is still incomplete.

Could this be related to a php.ini setting? I'm working with PHP 4 and I've have already set the following settings:
max_execution_time = "9000"
memory_limit = "1500M"

What about the following settings? Should I try something with them?
output_buffering
session.cache_limiter = "nocache"
session.cache_expire = "180"

Thanks in advance for any help.
Or something else completely?

#2
[eluser]AMC3[/eluser]
Or would these settings be relevant?
session.cache_limiter
session.cache_expire

#3
[eluser]AMC3[/eluser]
Anybody? I'm banging my head against the wall here...

#4
[eluser]vinodraut[/eluser]
I am also facing this problem. Any one here to help me. Please


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