Afbeelding downloaden lukt niet

Laat eens wat code zien.

<?php
downloads when referrer contains this text
define('ALLOWED_REFERRER', '');

define('BASE_DIR','upload');

define('LOG_DOWNLOADS',true);

define('LOG_FILE','downloads.log');

$allowed_ext = array (

// archives
'zip' => 'application/zip',

// documents
'pdf' => 'application/pdf',
'doc' => 'application/msword',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',

// executables
'exe' => 'application/octet-stream',

// images
'gif' => 'image/gif',
'png' => 'image/png',
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',

// audio
'mp3' => 'audio/mpeg',
'wav' => 'audio/x-wav',

// video
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'mpe' => 'video/mpeg',
'mov' => 'video/quicktime',
'avi' => 'video/x-msvideo'
);




if (ALLOWED_REFERRER !== ''
&& (!isset($_SERVER['HTTP_REFERER']) || strpos(strtoupper($_SERVER['HTTP_REFERER']),strtoupper(ALLOWED_REFERRER)) === false)
) {
die("Internal server error. Please contact system administrator.");
}

set_time_limit(0);

if (!isset($_GET['f']) || empty($_GET['f'])) {
die("Please specify file name for download.");
}

$fname = basename($_GET['f']);

function find_file ($dirname, $fname, &$file_path) {

$dir = opendir($dirname);

while ($file = readdir($dir)) {
if (empty($file_path) && $file != '.' && $file != '..') {
if (is_dir($dirname.'/'.$file)) {
find_file($dirname.'/'.$file, $fname, $file_path);
}
else {
if (file_exists($dirname.'/'.$fname)) {
$file_path = $dirname.'/'.$fname;
return;
}
}
}
}

}


$file_path = '';
find_file(BASE_DIR, $fname, $file_path);

if (!is_file($file_path)) {
die("File does not exist. Make sure you specified correct file name.");
}


$fsize = filesize($file_path);


$fext = strtolower(substr(strrchr($fname,"."),1));

if (!array_key_exists($fext, $allowed_ext)) {
die("Not allowed file type.");
}


if ($allowed_ext[$fext] == '') {
$mtype = '';
if (function_exists('mime_content_type')) {
$mtype = mime_content_type($file_path);
}
else if (function_exists('finfo_file')) {
$finfo = finfo_open(FILEINFO_MIME); // return mime type
$mtype = finfo_file($finfo, $file_path);
finfo_close($finfo);
}
if ($mtype == '') {
$mtype = "application/force-download";
}
}
else {
$mtype = $allowed_ext[$fext];
}

if (!isset($_GET['fc']) || empty($_GET['fc'])) {
$asfname = $fname;
}
else {
$asfname = str_replace(array('"',"'",'\\','/'), '', $_GET['fc']);
if ($asfname === '') $asfname = 'NoName';
}

header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Type: $mtype");
header("Content-Disposition: attachment; filename=\"$asfname\"");
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . $fsize);

$file = @fopen($file_path,"rb");
if ($file) {
while(!feof($file)) {
print(fread($file, 1024*8));
flush();
if (connection_status()!=0) {
@fclose($file);
die();
}
}
@fclose($file);
}

if (!LOG_DOWNLOADS) die();

$f = @fopen(LOG_FILE, 'a+');
if ($f) {
@fputs($f, date("m.d.Y g:ia")." ".$_SERVER['REMOTE_ADDR']." ".$fname."\n");
@fclose($f);
}

?>