<?php 

if (empty($HTTP_REFERER)) {
	if (!empty($_SERVER) && isset($_SERVER['HTTP_REFERER'])) {
		$HTTP_REFERER = $_SERVER['HTTP_REFERER'];
	}
	else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_REFERER'])) {
		$HTTP_REFERER = $HTTP_SERVER_VARS['HTTP_REFERER'];
	}
}

if (empty($HTTP_REFERER)) exit;

$alpha = "ABCDEFGHIJKLMNOPQRSTUVWXZY";

for ($i = 0; $i < strlen($image); $i++) {

	if (strstr($alpha, strtoupper($image[$i]))) {
		$image[$i]=chr(ord($image[$i]) + ((strtoupper($image[$i]) > 'M') ? -13 : 13));
		}
}

if (substr($image, 0, 1) == '\\' || substr($image, 0, 1) == '/') {

	if (empty($DOCUMENT_ROOT)) {
		if (!empty($_SERVER) && isset($_SERVER['DOCUMENT_ROOT'])) {
			$DOCUMENT_ROOT = $_SERVER['DOCUMENT_ROOT'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['DOCUMENT_ROOT'])) {
			$DOCUMENT_ROOT = $HTTP_SERVER_VARS['DOCUMENT_ROOT'];
		}
	}

	if (substr($DOCUMENT_ROOT, -1) == '\\' || substr($DOCUMENT_ROOT, -1) == '/') {
		$DOCUMENT_ROOT = substr($DOCUMENT_ROOT, 0, strlen($DOCUMENT_ROOT) - 1); 
	}
	
	$image = $DOCUMENT_ROOT.$image;
}

$info = getimagesize($image);
if ($info == FALSE) exit;

switch($info[2]) {
	
	case 1: $mime = "image/gif"; break;
	case 2: $mime = "image/jpeg"; break;
	case 3: $mime = "image/png"; break;
	case 4: $mime = "application/x-shockwave-flash"; break;
	case 5: $mime = "image/psd"; break;
	case 6: $mime = "image/bmp"; break;
	case 7: $mime = "image/tiff"; break;
	case 8: $mime = "image/tiff"; break;
	case 9: $mime = "image/jpeg"; break;
	case 10: $mime = "image/jp2"; break;
	case 11: $mime = "image/jpx"; break;
	case 12: $mime = "image/jb2"; break;
	case 13: $mime = "application/x-shockwave-flash"; break;
	case 14: $mime = "image/iff"; break;
	default: $mime = "application/octet-stream"; break;
}

header("Content-type: ".$mime);
header("Content-disposition: filename=noname");
header("Pragma: no-cache");
header("Expires: 0");
header("Cache-control: no-cache,must-revalidate,no-store");

readfile($image); 

?>