<?php error_reporting(0);

define ('VERSION', '2.8.14');                                                                                                                                           // Version of this script 
//Load a config file if it exists. Otherwise, use the values below
if( file_exists(dirname(__FILE__) . '/timthumb-config.php'))    require_once('timthumb-config.php');
if(! defined('DEBUG_ON') )                                      define ('DEBUG_ON', false);                                                             // Enable debug logging to web server error log (STDERR)
if(! defined('DEBUG_LEVEL') )                           define ('DEBUG_LEVEL', 1);                                                              // Debug level 1 is less noisy and 3 is the most noisy
if(! defined('MEMORY_LIMIT') )                          define ('MEMORY_LIMIT', '30M');                                                 // Set PHP memory limit
if(! defined('BLOCK_EXTERNAL_LEECHERS') )       define ('BLOCK_EXTERNAL_LEECHERS', false);                              // If the image or webshot is being loaded on an external site, display a red "No Hotlinking" gif.
if(! defined('DISPLAY_ERROR_MESSAGES') )        define ('DISPLAY_ERROR_MESSAGES', true);                                // Display error messages. Set to false to turn off errors (good for production websites)
//Image fetching and caching
if(! defined('ALLOW_EXTERNAL') )                        define ('ALLOW_EXTERNAL', TRUE);                                                // Allow image fetching from external websites. Will check against ALLOWED_SITES if ALLOW_ALL_EXTERNAL_SITES is false
if(! defined('ALLOW_ALL_EXTERNAL_SITES') )      define ('ALLOW_ALL_EXTERNAL_SITES', false);                             // Less secure. 
if(! defined('FILE_CACHE_ENABLED') )            define ('FILE_CACHE_ENABLED', TRUE);                                    // Should we store resized/modified images on disk to speed things up?
if(! defined('FILE_CACHE_TIME_BETWEEN_CLEANS')) define ('FILE_CACHE_TIME_BETWEEN_CLEANS', 86400);       // How often the cache is cleaned 

if(! defined('FILE_CACHE_MAX_FILE_AGE') )       define ('FILE_CACHE_MAX_FILE_AGE', 86400);                              // How old does a file have to be to be deleted from the cache
if(! defined('FILE_CACHE_SUFFIX') )             define ('FILE_CACHE_SUFFIX', '.timthumb.txt');                  // What to put at the end of all files in the cache directory so we can identify them
if(! defined('FILE_CACHE_PREFIX') )             define ('FILE_CACHE_PREFIX', 'timthumb');                               // What to put at the beg of all files in the cache directory so we can identify them
if(! defined('FILE_CACHE_DIRECTORY') )          define ('FILE_CACHE_DIRECTORY', './cache');                             // Directory where images are cached. Left blank it will use the system temporary directory (which is better for security)
if(! defined('MAX_FILE_SIZE') )                         define ('MAX_FILE_SIZE', 10485760);                                             // 10 Megs is 10485760. This is the max internal or external file size that we'll process.  
if(! defined('CURL_TIMEOUT') )                          define ('CURL_TIMEOUT', 20);                                                    // Timeout duration for Curl. This only applies if you have Curl installed and aren't using PHP's default URL fetching mechanism.
if(! defined('WAIT_BETWEEN_FETCH_ERRORS') )     define ('WAIT_BETWEEN_FETCH_ERRORS', 3600);                             // Time to wait between errors fetching remote file

//Browser caching
if(! defined('BROWSER_CACHE_MAX_AGE') )         define ('BROWSER_CACHE_MAX_AGE', 864000);                               // Time to cache in the browser
if(! defined('BROWSER_CACHE_DISABLE') )         define ('BROWSER_CACHE_DISABLE', false);                                // Use for testing if you want to disable all browser caching

//Image size and defaults
if(! defined('MAX_WIDTH') )                                     define ('MAX_WIDTH', 1500);                                                             // Maximum image width
if(! defined('MAX_HEIGHT') )                            define ('MAX_HEIGHT', 1500);                                                    // Maximum image height
if(! defined('NOT_FOUND_IMAGE') )                       define ('NOT_FOUND_IMAGE', '');                                                 // Image to serve if any 404 occurs 
if(! defined('ERROR_IMAGE') )                           define ('ERROR_IMAGE', '');                                                             // Image to serve if an error occurs instead of showing error message 
if(! defined('PNG_IS_TRANSPARENT') )            define ('PNG_IS_TRANSPARENT', FALSE);                                   // Define if a png image should have a transparent background color. Use False value if you want to display a custom coloured canvas_colour 
if(! defined('DEFAULT_Q') )                                     define ('DEFAULT_Q', 100);                                                               // Default image quality. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_ZC') )                            define ('DEFAULT_ZC', 1);                                                               // Default zoom/crop setting. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_F') )                                     define ('DEFAULT_F', '');                                                               // Default image filters. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_S') )                                     define ('DEFAULT_S', 0);                                                                // Default sharpen value. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_CC') )                            define ('DEFAULT_CC', 'ffffff');                                                // Default canvas colour. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_WIDTH') )                         define ('DEFAULT_WIDTH', 100);                                                  // Default thumbnail width. Allows overrid in timthumb-config.php
if(! defined('DEFAULT_HEIGHT') )                        define ('DEFAULT_HEIGHT', 100);                                                 // Default thumbnail height. Allows overrid in timthumb-config.php


if(! defined('OPTIPNG_ENABLED') )               define ('OPTIPNG_ENABLED', false);  
if(! defined('OPTIPNG_PATH') )                  define ('OPTIPNG_PATH', '/usr/bin/optipng'); //This will run first because it gives better compression than pngcrush. 
if(! defined('PNGCRUSH_ENABLED') )              define ('PNGCRUSH_ENABLED', false); 
if(! defined('PNGCRUSH_PATH') )                 define ('PNGCRUSH_PATH', '/usr/bin/pngcrush'); //This will only run if OPTIPNG_PATH is not set or is not valid

/*
        -------====Website Screenshots configuration - BETA====-------
        
        

*/
if(! defined('WEBSHOT_ENABLED') )       define ('WEBSHOT_ENABLED', false);                      //Beta feature. Adding webshot=1 to your query string will cause the script to return a browser screenshot rather than try to fetch an image.
if(! defined('WEBSHOT_CUTYCAPT') )      define ('WEBSHOT_CUTYCAPT', '/usr/local/bin/CutyCapt'); //The path to CutyCapt. 
if(! defined('WEBSHOT_XVFB') )          define ('WEBSHOT_XVFB', '/usr/bin/xvfb-run');           //The path to the Xvfb server
if(! defined('WEBSHOT_SCREEN_X') )      define ('WEBSHOT_SCREEN_X', '1024');                    //1024 works ok
if(! defined('WEBSHOT_SCREEN_Y') )      define ('WEBSHOT_SCREEN_Y', '768');                     //768 works ok
if(! defined('WEBSHOT_COLOR_DEPTH') )   define ('WEBSHOT_COLOR_DEPTH', '24');                   //I haven't tested anything besides 24
if(! defined('WEBSHOT_IMAGE_FORMAT') )  define ('WEBSHOT_IMAGE_FORMAT', 'png');                 //png is about 2.5 times the size of jpg but is a LOT better quality
if(! defined('WEBSHOT_TIMEOUT') )       define ('WEBSHOT_TIMEOUT', '20');                       //Seconds to wait for a webshot
if(! defined('WEBSHOT_USER_AGENT') )    define ('WEBSHOT_USER_AGENT', "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.18) Gecko/20110614 Firefox/3.6.18"); //I hate to do this, but a non-browser robot user agent might not show what humans see. So we pretend to be Firefox
if(! defined('WEBSHOT_JAVASCRIPT_ON') ) define ('WEBSHOT_JAVASCRIPT_ON', true);                 //Setting to false might give you a slight speedup and block ads. But it could cause other issues.
if(! defined('WEBSHOT_JAVA_ON') )       define ('WEBSHOT_JAVA_ON', false);                      //Have only tested this as fase
if(! defined('WEBSHOT_PLUGINS_ON') )    define ('WEBSHOT_PLUGINS_ON', true);                    //Enable flash and other plugins
if(! defined('WEBSHOT_PROXY') )         define ('WEBSHOT_PROXY', '');                           //In case you're behind a proxy server. 
if(! defined('WEBSHOT_XVFB_RUNNING') )  define ('WEBSHOT_XVFB_RUNNING', false);                 //ADVANCED: Enable this if you've got Xvfb running in the background.


// If ALLOW_EXTERNAL is true and ALLOW_ALL_EXTERNAL_SITES is false, then external images will only be fetched from these domains and their subdomains. 
if(! isset($ALLOWED_SITES)){
        $ALLOWED_SITES = array (
                'flickr.com',
                'staticflickr.com',
                'picasa.com',
                'img.youtube.com',
                'upload.wikimedia.org',
                'photobucket.com',
                'imgur.com',
                'imageshack.us',
                'tinypic.com',
        );
}
// -------------------------------------------------------------
// -------------- STOP EDITING CONFIGURATION HERE --------------
// -------------------------------------------------------------

timthumb::start();

class timthumb {
        protected $src = "";
        protected $is404 = false;
        protected $docRoot = "";
        protected $lastURLError = false;
        protected $localImage = "";
        protected $localImageMTime = 0;
        protected $url = false;
        protected $myHost = "";
        protected $isURL = false;
        protected $cachefile = '';
        protected $errors = array();
        protected $toDeletes = array();
        protected $cacheDirectory = '';
        protected $startTime = 0;
        protected $lastBenchTime = 0;
        protected $cropTop = false;
        protected $salt = "";
        protected $fileCacheVersion = 1; //Generally if timthumb.php is modifed (upgraded) then the salt changes and all cache files are recreated. This is a backup mechanism to force regen.
        protected $filePrependSecurityBlock = "<?php die('Execution denied!'); //"; //Designed to have three letter mime type, space, question mark and greater than symbol appended. 6 bytes total.
        protected static $curlDataWritten = 0;
        protected static $curlFH = false;
        public static function start(){
                $tim = new timthumb();
                $tim->handleErrors();
                $tim->securityChecks();
                if($tim->tryBrowserCache()){
                        exit(0);
                }
                $tim->handleErrors();
                if(FILE_CACHE_ENABLED && $tim->tryServerCache()){
                        exit(0);
                }
                $tim->handleErrors();
                $tim->run();
                $tim->handleErrors();
                exit(0);
        }
        public function __construct(){
                global $ALLOWED_SITES;
                $this->startTime = microtime(true);
                date_default_timezone_set('UTC');
                $this->debug(1, "Starting new request from " . $this->getIP() . " to " . $_SERVER['REQUEST_URI']);
                $this->calcDocRoot();
                //On windows systems I'm assuming fileinode returns an empty string or a number that doesn't change. Check this.
                $this->salt = @filemtime(__FILE__) . '-' . @fileinode(__FILE__);
                $this->debug(3, "Salt is: " . $this->salt);
                if(FILE_CACHE_DIRECTORY){
                        if(! is_dir(FILE_CACHE_DIRECTORY)){
                                @mkdir(FILE_CACHE_DIRECTORY);
                                if(! is_dir(FILE_CACHE_DIRECTORY)){
                                        $this->error("Could not create the file cache directory.");
                                        return false;
                                }
                        }
                        $this->cacheDirectory = FILE_CACHE_DIRECTORY;
                        if (!touch($this->cacheDirectory . '/index.html')) {
                                $this->error("Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.");
                        }
                } else {
                        $this->cacheDirectory = sys_get_temp_dir();
                }
                //Clean the cache before we do anything because we don't want the first visitor after FILE_CACHE_TIME_BETWEEN_CLEANS expires to get a stale image. 
                $this->cleanCache();
                
                $this->myHost = preg_replace('/^www\./i', '', $_SERVER['HTTP_HOST']);
                $this->src = $this->param('src');
                $this->url = parse_url($this->src);
                $this->src = preg_replace('/https?:\/\/(?:www\.)?' . $this->myHost . '/i', '', $this->src);
                
                if(strlen($this->src) <= 3){
                        $this->error("No image specified");
                        return false;
                }
                if(BLOCK_EXTERNAL_LEECHERS && array_key_exists('HTTP_REFERER', $_SERVER) && (! preg_match('/^https?:\/\/(?:www\.)?' . $this->myHost . '(?:$|\/)/i', $_SERVER['HTTP_REFERER']))){
                        // base64 encoded red image that says 'no hotlinkers'
                        // nothing to worry about! :)
                        $imgData = base64_decode("R0lGODlhUAAMAIAAAP8AAP///yH5BAAHAP8ALAAAAABQAAwAAAJpjI+py+0Po5y0OgAMjjv01YUZ\nOGplhWXfNa6JCLnWkXplrcBmW+spbwvaVr/cDyg7IoFC2KbYVC2NQ5MQ4ZNao9Ynzjl9ScNYpneb\nDULB3RP6JuPuaGfuuV4fumf8PuvqFyhYtjdoeFgAADs=");
                        header('Content-Type: image/gif');
                        header('Content-Length: ' . strlen($imgData));
                        header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
                        header("Pragma: no-cache");
                        header('Expires: ' . gmdate ('D, d M Y H:i:s', time()));
                        echo $imgData;
                        return false;
                        exit(0);
                }
                if(preg_match('/^https?:\/\/[^\/]+/i', $this->src)){
                        $this->debug(2, "Is a request for an external URL: " . $this->src);
                        $this->isURL = true;
                } else {
                        $this->debug(2, "Is a request for an internal file: " . $this->src);
                }
                if($this->isURL && (! ALLOW_EXTERNAL)){
                        $this->error("You are not allowed to fetch images from an external website.");
                        return false;
                }
                if($this->isURL){
                        if(ALLOW_ALL_EXTERNAL_SITES){
                                $this->debug(2, "Fetching from all external sites is enabled.");
                        } else {
                                $this->debug(2, "Fetching only from selected external sites is enabled.");
                                $allowed = false;
                                foreach($ALLOWED_SITES as $site){
                                        if ((strtolower(substr($this->url['host'],-strlen($site)-1)) === strtolower(".$site")) || (strtolower($this->url['host'])===strtolower($site))) {
                                                $this->debug(3, "URL hostname {$this->url['host']} matches $site so allowing.");
                                                $allowed = true;
                                        }
                                }
                                if(! $allowed){
                                        return $this->error("You may not fetch images from that site. To enable this site in timthumb, you can either add it to \$ALLOWED_SITES and set ALLOW_EXTERNAL=true. Or you can set ALLOW_ALL_EXTERNAL_SITES=true, depending on your security needs.");
                                }
                        }
                }

                $cachePrefix = ($this->isURL ? '_ext_' : '_int_');
                if($this->isURL){
                        $arr = explode('&', $_SERVER ['QUERY_STRING']);
                        asort($arr);
                        $this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . implode('', $arr) . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
                } else {
                        $this->localImage = $this->getLocalImagePath($this->src);
                        if(! $this->localImage){
                                $this->debug(1, "Could not find the local image: {$this->localImage}");
                                $this->error("Could not find the internal image you specified.");
                                $this->set404();
                                return false;
                        }
                        $this->debug(1, "Local image path is {$this->localImage}");
                        $this->localImageMTime = @filemtime($this->localImage);
                        //We include the mtime of the local file in case in changes on disk.
                        $this->cachefile = $this->cacheDirectory . '/' . FILE_CACHE_PREFIX . $cachePrefix . md5($this->salt . $this->localImageMTime . $_SERVER ['QUERY_STRING'] . $this->fileCacheVersion) . FILE_CACHE_SUFFIX;
                }
                $this->debug(2, "Cache file is: " . $this->cachefile);

                return true;
        }
        public function __destruct(){
                foreach($this->toDeletes as $del){
                        $this->debug(2, "Deleting temp file $del");
                        @unlink($del);
                }
        }
        public function run(){
                if($this->isURL){
                        if(! ALLOW_EXTERNAL){
                                $this->debug(1, "Got a request for an external image but ALLOW_EXTERNAL is disabled so returning error msg.");
                                $this->error("You are not allowed to fetch images from an external website.");
                                return false;
                        }
                        $this->debug(3, "Got request for external image. Starting serveExternalImage.");
                        if($this->param('webshot')){
                                if(WEBSHOT_ENABLED){
                                        $this->debug(3, "webshot param is set, so we're going to take a webshot.");
                                        $this->serveWebshot();
                                } else {
                                        $this->error("You added the webshot parameter but webshots are disabled on this server. You need to set WEBSHOT_ENABLED == true to enable webshots.");
                                }
                        } else {
                                $this->debug(3, "webshot is NOT set so we're going to try to fetch a regular image.");
                                $this->serveExternalImage();

                        }
                } else {
                        $this->debug(3, "Got request for internal image. Starting serveInternalImage()");
                        $this->serveInternalImage();
                }
                return true;
        }
        protected function handleErrors(){
                if($this->haveErrors()){ 
                        if(NOT_FOUND_IMAGE && $this->is404()){
                                if($this->serveImg(NOT_FOUND_IMAGE)){
                                        exit(0);
                                } else {
                                        $this->error("Additionally, the 404 image that is configured could not be found or there was an error serving it.");
                                }
                        }
                        if(ERROR_IMAGE){
                                if($this->serveImg(ERROR_IMAGE)){
                                        exit(0);
                                } else {
                                        $this->error("Additionally, the error image that is configured could not be found or there was an error serving it.");
                                }
                        }
                        $this->serveErrors(); 
                        exit(0); 
                }
                return false;
        }
        protected function tryBrowserCache(){
                if(BROWSER_CACHE_DISABLE){ $this->debug(3, "Browser caching is disabled"); return false; }
                if(!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ){
                        $this->debug(3, "Got a conditional get");
                        $mtime = false;
                        //We've already checked if the real file exists in the constructor
                        if(! is_file($this->cachefile)){
                                //If we don't have something cached, regenerate the cached image.
                                return false;
                        }
                        if($this->localImageMTime){
                                $mtime = $this->localImageMTime;
                                $this->debug(3, "Local real file's modification time is $mtime");
                        } else if(is_file($this->cachefile)){ //If it's not a local request then use the mtime of the cached file to determine the 304
                                $mtime = @filemtime($this->cachefile);
                                $this->debug(3, "Cached file's modification time is $mtime");
                        }
                        if(! $mtime){ return false; }

                        $iftime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
                        $this->debug(3, "The conditional get's if-modified-since unixtime is $iftime");
                        if($iftime < 1){
                                $this->debug(3, "Got an invalid conditional get modified since time. Returning false.");
                                return false;
                        }
                        if($iftime < $mtime){ //Real file or cache file has been modified since last request, so force refetch.
                                $this->debug(3, "File has been modified since last fetch.");
                                return false;
                        } else { //Otherwise serve a 304
                                $this->debug(3, "File has not been modified since last get, so serving a 304.");
                                header ($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
                                $this->debug(1, "Returning 304 not modified");
                                return true;
                        }
                }
                return false;
        }
        protected function tryServerCache(){
                $this->debug(3, "Trying server cache");
                if(file_exists($this->cachefile)){
                        $this->debug(3, "Cachefile {$this->cachefile} exists");
                        if($this->isURL){
                                $this->debug(3, "This is an external request, so checking if the cachefile is empty which means the request failed previously.");
                                if(filesize($this->cachefile) < 1){
                                        $this->debug(3, "Found an empty cachefile indicating a failed earlier request. Checking how old it is.");
                                        //Fetching error occured previously
                                        if(time() - @filemtime($this->cachefile) > WAIT_BETWEEN_FETCH_ERRORS){
                                                $this->debug(3, "File is older than " . WAIT_BETWEEN_FETCH_ERRORS . " seconds. Deleting and returning false so app can try and load file.");
                                                @unlink($this->cachefile);
                                                return false; //to indicate we didn't serve from cache and app should try and load
                                        } else {
                                                $this->debug(3, "Empty cachefile is still fresh so returning message saying we had an error fetching this image from remote host.");
                                                $this->set404();
                                                $this->error("An error occured fetching image.");
                                                return false; 
                                        }
                                }
                        } else {
                                $this->debug(3, "Trying to serve cachefile {$this->cachefile}");
                        }
                        if($this->serveCacheFile()){
                                $this->debug(3, "Succesfully served cachefile {$this->cachefile}");
                                return true;
                        } else {
                                $this->debug(3, "Failed to serve cachefile {$this->cachefile} - Deleting it from cache.");
                                //Image serving failed. We can't retry at this point, but lets remove it from cache so the next request recreates it
                                @unlink($this->cachefile);
                                return true;
                        }
                }
        }
        protected function error($err){
                $this->debug(3, "Adding error message: $err");
                $this->errors[] = $err;
                return false;

        }
        protected function haveErrors(){
                if(sizeof($this->errors) > 0){
                        return true;
                }
                return false;
        }
        protected function serveErrors(){
                header ($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request');
                if ( ! DISPLAY_ERROR_MESSAGES ) {
                        return;
                }
                $html = '<ul>';
                foreach($this->errors as $err){
                        $html .= '<li>' . htmlentities($err) . '</li>';
                }
                $html .= '</ul>';
                echo '<h1>A TimThumb error has occured</h1>The following error(s) occured:<br />' . $html . '<br />';
                echo '<br />Query String : ' . htmlentities( $_SERVER['QUERY_STRING'], ENT_QUOTES );
                echo '<br />TimThumb version : ' . VERSION . '</pre>';
        }
        protected function serveInternalImage(){
                $this->debug(3, "Local image path is $this->localImage");
                if(! $this->localImage){
                        $this->sanityFail("localImage not set after verifying it earlier in the code.");
                        return false;
                }
                $fileSize = filesize($this->localImage);
                if($fileSize > MAX_FILE_SIZE){
                        $this->error("The file you specified is greater than the maximum allowed file size.");
                        return false;
                }
                if($fileSize <= 0){
                        $this->error("The file you specified is <= 0 bytes.");
                        return false;
                }
                $this->debug(3, "Calling processImageAndWriteToCache() for local image.");
                if($this->processImageAndWriteToCache($this->localImage)){
                        $this->serveCacheFile();
                        return true;
                } else { 
                        return false;
                }
        }
        protected function cleanCache(){
                if (FILE_CACHE_TIME_BETWEEN_CLEANS < 0) {
                        return;
                }
                $this->debug(3, "cleanCache() called");
                $lastCleanFile = $this->cacheDirectory . '/timthumb_cacheLastCleanTime.touch';
                
                //If this is a new timthumb installation we need to create the file
                if(! is_file($lastCleanFile)){
                        $this->debug(1, "File tracking last clean doesn't exist. Creating $lastCleanFile");
                        if (!touch($lastCleanFile)) {
                                $this->error("Could not create cache clean timestamp file.");
                        }
                        return;
                }
                if(@filemtime($lastCleanFile) < (time() - FILE_CACHE_TIME_BETWEEN_CLEANS) ){ //Cache was last cleaned more than 1 day ago
                        $this->debug(1, "Cache was last cleaned more than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago. Cleaning now.");
                        // Very slight race condition here, but worst case we'll have 2 or 3 servers cleaning the cache simultaneously once a day.
                        if (!touch($lastCleanFile)) {
                                $this->error("Could not create cache clean timestamp file.");
                        }
                        $files = glob($this->cacheDirectory . '/*' . FILE_CACHE_SUFFIX);
                        if ($files) {
                                $timeAgo = time() - FILE_CACHE_MAX_FILE_AGE;
                                foreach($files as $file){
                                        if(@filemtime($file) < $timeAgo){
                                                $this->debug(3, "Deleting cache file $file older than max age: " . FILE_CACHE_MAX_FILE_AGE . " seconds");
                                                @unlink($file);
                                        }
                                }
                        }
                        return true;
                } else {
                        $this->debug(3, "Cache was cleaned less than " . FILE_CACHE_TIME_BETWEEN_CLEANS . " seconds ago so no cleaning needed.");
                }
                return false;
        }
        protected function processImageAndWriteToCache($localImage){
                $sData = getimagesize($localImage);
                $origType = $sData[2];
                $mimeType = $sData['mime'];

                $this->debug(3, "Mime type of image is $mimeType");
                if(! preg_match('/^image\/(?:gif|jpg|jpeg|png)$/i', $mimeType)){
                        return $this->error("The image being resized is not a valid gif, jpg or png.");
                }

                if (!function_exists ('imagecreatetruecolor')) {
                    return $this->error('GD Library Error: imagecreatetruecolor does not exist - please contact your webhost and ask them to install the GD library');
                }

                if (function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
                        $imageFilters = array (
                                1 => array (IMG_FILTER_NEGATE, 0),
                                2 => array (IMG_FILTER_GRAYSCALE, 0),
                                3 => array (IMG_FILTER_BRIGHTNESS, 1),
                                4 => array (IMG_FILTER_CONTRAST, 1),
                                5 => array (IMG_FILTER_COLORIZE, 4),
                                6 => array (IMG_FILTER_EDGEDETECT, 0),
                                7 => array (IMG_FILTER_EMBOSS, 0),
                                8 => array (IMG_FILTER_GAUSSIAN_BLUR, 0),
                                9 => array (IMG_FILTER_SELECTIVE_BLUR, 0),
                                10 => array (IMG_FILTER_MEAN_REMOVAL, 0),
                                11 => array (IMG_FILTER_SMOOTH, 0),
                        );
                }

                // get standard input properties                
                $new_width =  (int) abs ($this->param('w', 0));
                $new_height = (int) abs ($this->param('h', 0));
                $zoom_crop = (int) $this->param('zc', DEFAULT_ZC);
                $quality = (int) abs ($this->param('q', DEFAULT_Q));
                $align = $this->cropTop ? 't' : $this->param('a', 'c');
                $filters = $this->param('f', DEFAULT_F);
                $sharpen = (bool) $this->param('s', DEFAULT_S);
                $canvas_color = $this->param('cc', DEFAULT_CC);
                $canvas_trans = (bool) $this->param('ct', '1');

                // set default width and height if neither are set already
                if ($new_width == 0 && $new_height == 0) {
                    $new_width = (int) DEFAULT_WIDTH;
                    $new_height = (int) DEFAULT_HEIGHT;
                }

                // ensure size limits can not be abused
                $new_width = min ($new_width, MAX_WIDTH);
                $new_height = min ($new_height, MAX_HEIGHT);

                // set memory limit to be able to have enough space to resize larger images
                $this->setMemoryLimit();

                // open the existing image
                $image = $this->openImage ($mimeType, $localImage);
                if ($image === false) {
                        return $this->error('Unable to open image.');
                }

                // Get original width and height
                $width = imagesx ($image);
                $height = imagesy ($image);
                $origin_x = 0;
                $origin_y = 0;

                // generate new w/h if not provided
                if ($new_width && !$new_height) {
                        $new_height = floor ($height * ($new_width / $width));
                } else if ($new_height && !$new_width) {
                        $new_width = floor ($width * ($new_height / $height));
                }

                // scale down and add borders
                if ($zoom_crop == 3) {

                        $final_height = $height * ($new_width / $width);

                        if ($final_height > $new_height) {
                                $new_width = $width * ($new_height / $height);
                        } else {
                                $new_height = $final_height;
                        }

                }

                // create a new true color image
                $canvas = imagecreatetruecolor ($new_width, $new_height);
                imagealphablending ($canvas, false);

                if (strlen($canvas_color) == 3) { //if is 3-char notation, edit string into 6-char notation
                        $canvas_color =  str_repeat(substr($canvas_color, 0, 1), 2) . str_repeat(substr($canvas_color, 1, 1), 2) . str_repeat(substr($canvas_color, 2, 1), 2); 
                } else if (strlen($canvas_color) != 6) {
                        $canvas_color = DEFAULT_CC; // on error return default canvas color
                }

                $canvas_color_R = hexdec (substr ($canvas_color, 0, 2));
                $canvas_color_G = hexdec (substr ($canvas_color, 2, 2));
                $canvas_color_B = hexdec (substr ($canvas_color, 4, 2));

                // Create a new transparent color for image
            // If is a png and PNG_IS_TRANSPARENT is false then remove the alpha transparency 
                // (and if is set a canvas color show it in the background)
                if(preg_match('/^image\/png$/i', $mimeType) && !PNG_IS_TRANSPARENT && $canvas_trans){ 
                        $color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 127);             
                }else{
                        $color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 0);
                }


                // Completely fill the background of the new image with allocated color.
                imagefill ($canvas, 0, 0, $color);

                // scale down and add borders
                if ($zoom_crop == 2) {

                        $final_height = $height * ($new_width / $width);

                        if ($final_height > $new_height) {

                                $origin_x = $new_width / 2;
                                $new_width = $width * ($new_height / $height);
                                $origin_x = round ($origin_x - ($new_width / 2));

                        } else {

                                $origin_y = $new_height / 2;
                                $new_height = $final_height;
                                $origin_y = round ($origin_y - ($new_height / 2));

                        }

                }

                // Restore transparency blending
                imagesavealpha ($canvas, true);

                if ($zoom_crop > 0) {

                        $src_x = $src_y = 0;
                        $src_w = $width;
                        $src_h = $height;

                        $cmp_x = $width / $new_width;
                        $cmp_y = $height / $new_height;

                        // calculate x or y coordinate and width or height of source
                        if ($cmp_x > $cmp_y) {

                                $src_w = round ($width / $cmp_x * $cmp_y);
                                $src_x = round (($width - ($width / $cmp_x * $cmp_y)) / 2);

                        } else if ($cmp_y > $cmp_x) {

                                $src_h = round ($height / $cmp_y * $cmp_x);
                                $src_y = round (($height - ($height / $cmp_y * $cmp_x)) / 2);

                        }

                        // positional cropping!
                        if ($align) {
                                if (strpos ($align, 't') !== false) {
                                        $src_y = 0;
                                }
                                if (strpos ($align, 'b') !== false) {
                                        $src_y = $height - $src_h;
                                }
                                if (strpos ($align, 'l') !== false) {
                                        $src_x = 0;
                                }
                                if (strpos ($align, 'r') !== false) {
                                        $src_x = $width - $src_w;
                                }
                        }

                        imagecopyresampled ($canvas, $image, $origin_x, $origin_y, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h);

                } else {

                        // copy and resize part of an image with resampling
                        imagecopyresampled ($canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

                }

                if ($filters != '' && function_exists ('imagefilter') && defined ('IMG_FILTER_NEGATE')) {
                        // apply filters to image
                        $filterList = explode ('|', $filters);
                        foreach ($filterList as $fl) {

                                $filterSettings = explode (',', $fl);
                                if (isset ($imageFilters[$filterSettings[0]])) {

                                        for ($i = 0; $i < 4; $i ++) {
                                                if (!isset ($filterSettings[$i])) {
                                                        $filterSettings[$i] = null;
                                                } else {
                                                        $filterSettings[$i] = (int) $filterSettings[$i];
                                                }
                                        }

                                        switch ($imageFilters[$filterSettings[0]][1]) {

                                                case 1:

                                                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1]);
                                                        break;

                                                case 2:

                                                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2]);
                                                        break;

                                                case 3:

                                                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3]);
                                                        break;

                                                case 4:

                                                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0], $filterSettings[1], $filterSettings[2], $filterSettings[3], $filterSettings[4]);
                                                        break;

                                                default:

                                                        imagefilter ($canvas, $imageFilters[$filterSettings[0]][0]);
                                                        break;

                                        }
                                }
                        }
                }

                // sharpen image
                if ($sharpen && function_exists ('imageconvolution')) {

                        $sharpenMatrix = array (
                                        array (-1,-1,-1),
                                        array (-1,16,-1),
                                        array (-1,-1,-1),
                                        );

                        $divisor = 8;
                        $offset = 0;

                        imageconvolution ($canvas, $sharpenMatrix, $divisor, $offset);

                }
                //Straight from Wordpress core code. Reduces filesize by up to 70% for PNG's
                if ( (IMAGETYPE_PNG == $origType || IMAGETYPE_GIF == $origType) && function_exists('imageistruecolor') && !imageistruecolor( $image ) && imagecolortransparent( $image ) > 0 ){
                        imagetruecolortopalette( $canvas, false, imagecolorstotal( $image ) );
                }

                $imgType = "";
                $tempfile = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
                if(preg_match('/^image\/(?:jpg|jpeg)$/i', $mimeType)){ 
                        $imgType = 'jpg';
                        imagejpeg($canvas, $tempfile, $quality); 
                } else if(preg_match('/^image\/png$/i', $mimeType)){ 
                        $imgType = 'png';
                        imagepng($canvas, $tempfile, floor($quality * 100));
                } else if(preg_match('/^image\/gif$/i', $mimeType)){
                        $imgType = 'gif';
                        imagegif($canvas, $tempfile);
                } else {
                        return $this->sanityFail("Could not match mime type after verifying it previously.");
                }

                if($imgType == 'png' && OPTIPNG_ENABLED && OPTIPNG_PATH && @is_file(OPTIPNG_PATH)){
                        $exec = OPTIPNG_PATH;
                        $this->debug(3, "optipng'ing $tempfile");
                        $presize = filesize($tempfile);
                        $out = `$exec -o1 $tempfile`; //you can use up to -o7 but it really slows things down
                        clearstatcache();
                        $aftersize = filesize($tempfile);
                        $sizeDrop = $presize - $aftersize;
                        if($sizeDrop > 0){
                                $this->debug(1, "optipng reduced size by $sizeDrop");
                        } else if($sizeDrop < 0){
                                $this->debug(1, "optipng increased size! Difference was: $sizeDrop");
                        } else {
                                $this->debug(1, "optipng did not change image size.");
                        }
                } else if($imgType == 'png' && PNGCRUSH_ENABLED && PNGCRUSH_PATH && @is_file(PNGCRUSH_PATH)){
                        $exec = PNGCRUSH_PATH;
                        $tempfile2 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
                        $this->debug(3, "pngcrush'ing $tempfile to $tempfile2");
                        $out = `$exec $tempfile $tempfile2`;
                        $todel = "";
                        if(is_file($tempfile2)){
                                $sizeDrop = filesize($tempfile) - filesize($tempfile2);
                                if($sizeDrop > 0){
                                        $this->debug(1, "pngcrush was succesful and gave a $sizeDrop byte size reduction");
                                        $todel = $tempfile;
                                        $tempfile = $tempfile2;
                                } else {
                                        $this->debug(1, "pngcrush did not reduce file size. Difference was $sizeDrop bytes.");
                                        $todel = $tempfile2;
                                }
                        } else {
                                $this->debug(3, "pngcrush failed with output: $out");
                                $todel = $tempfile2;
                        }
                        @unlink($todel);
                }

                $this->debug(3, "Rewriting image with security header.");
                $tempfile4 = tempnam($this->cacheDirectory, 'timthumb_tmpimg_');
                $context = stream_context_create ();
                $fp = fopen($tempfile,'r',0,$context);
                file_put_contents($tempfile4, $this->filePrependSecurityBlock . $imgType . ' ?' . '>'); //6 extra bytes, first 3 being image type 
                file_put_contents($tempfile4, $fp, FILE_APPEND);
                fclose($fp);
                @unlink($tempfile);
                $this->debug(3, "Locking and replacing cache file.");
                $lockFile = $this->cachefile . '.lock';
                $fh = fopen($lockFile, 'w');
                if(! $fh){
                        return $this->error("Could not open the lockfile for writing an image.");
                }
                if(flock($fh, LOCK_EX)){
                        @unlink($this->cachefile); //rename generally overwrites, but doing this in case of platform specific quirks. File might not exist yet.
                        rename($tempfile4, $this->cachefile);
                        flock($fh, LOCK_UN);
                        fclose($fh);
                        @unlink($lockFile);
                } else {
                        fclose($fh);
                        @unlink($lockFile);
                        @unlink($tempfile4);
                        return $this->error("Could not get a lock for writing.");
                }
                $this->debug(3, "Done image replace with security header. Cleaning up and running cleanCache()");
                imagedestroy($canvas);
                imagedestroy($image);
                return true;
        }
        protected function calcDocRoot(){
                $docRoot = @$_SERVER['DOCUMENT_ROOT'];
                if (defined('LOCAL_FILE_BASE_DIRECTORY')) {
                        $docRoot = LOCAL_FILE_BASE_DIRECTORY;   
                }
                if(!isset($docRoot)){ 
                        $this->debug(3, "DOCUMENT_ROOT is not set. This is probably windows. Starting search 1.");
                        if(isset($_SERVER['SCRIPT_FILENAME'])){
                                $docRoot = str_replace( '\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0-strlen($_SERVER['PHP_SELF'])));
                                $this->debug(3, "Generated docRoot using SCRIPT_FILENAME and PHP_SELF as: $docRoot");
                        } 
                }
                if(!isset($docRoot)){ 
                        $this->debug(3, "DOCUMENT_ROOT still is not set. Starting search 2.");
                        if(isset($_SERVER['PATH_TRANSLATED'])){
                                $docRoot = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0-strlen($_SERVER['PHP_SELF'])));
                                $this->debug(3, "Generated docRoot using PATH_TRANSLATED and PHP_SELF as: $docRoot");
                        } 
                }
                if($docRoot && $_SERVER['DOCUMENT_ROOT'] != '/'){ $docRoot = preg_replace('/\/$/', '', $docRoot); }
                $this->debug(3, "Doc root is: " . $docRoot);
                $this->docRoot = $docRoot;

        }
        protected function getLocalImagePath($src){
                $src = ltrim($src, '/'); //strip off the leading '/'
                if(! $this->docRoot){
                        $this->debug(3, "We have no document root set, so as a last resort, lets check if the image is in the current dir and serve that.");
                        //We don't support serving images outside the current dir if we don't have a doc root for security reasons.
                        $file = preg_replace('/^.*?([^\/\\\\]+)$/', '$1', $src); //strip off any path info and just leave the filename.
                        if(is_file($file)){
                                return $this->realpath($file);
                        }
                        return $this->error("Could not find your website document root and the file specified doesn't exist in timthumbs directory. We don't support serving files outside timthumb's directory without a document root for security reasons.");
                } else if ( ! is_dir( $this->docRoot ) ) {
                        $this->error("Server path does not exist. Ensure variable \$_SERVER['DOCUMENT_ROOT'] is set correctly");
                }
                
                //Do not go past this point without docRoot set

                //Try src under docRoot
                if(file_exists ($this->docRoot . '/' . $src)) {
                        $this->debug(3, "Found file as " . $this->docRoot . '/' . $src);
                        $real = $this->realpath($this->docRoot . '/' . $src);
                        if(stripos($real, $this->docRoot) === 0){
                                return $real;
                        } else {
                                $this->debug(1, "Security block: The file specified occurs outside the document root.");
                                //allow search to continue
                        }
                }
                //Check absolute paths and then verify the real path is under doc root
                $absolute = $this->realpath('/' . $src);
                if($absolute && file_exists($absolute)){ //realpath does file_exists check, so can probably skip the exists check here
                        $this->debug(3, "Found absolute path: $absolute");
                        if(! $this->docRoot){ $this->sanityFail("docRoot not set when checking absolute path."); }
                        if(stripos($absolute, $this->docRoot) === 0){
                                return $absolute;
                        } else {
                                $this->debug(1, "Security block: The file specified occurs outside the document root.");
                                //and continue search
                        }
                }
                
                $base = $this->docRoot;
                
                // account for Windows directory structure
                if (strstr($_SERVER['SCRIPT_FILENAME'],':')) {
                        $sub_directories = explode('\\', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
                } else {
                        $sub_directories = explode('/', str_replace($this->docRoot, '', $_SERVER['SCRIPT_FILENAME']));
                }

                foreach ($sub_directories as $sub){
                        $base .= $sub . '/';
                        $this->debug(3, "Trying file as: " . $base . $src);
                        if(file_exists($base . $src)){
                                $this->debug(3, "Found file as: " . $base . $src);
                                $real = $this->realpath($base . $src);
                                if(stripos($real, $this->realpath($this->docRoot)) === 0){
                                        return $real;
                                } else {
                                        $this->debug(1, "Security block: The file specified occurs outside the document root.");
                                        //And continue search
                                }
                        }
                }
                return false;
        }
        protected function realpath($path){
                //try to remove any relative paths
                $remove_relatives = '/\w+\/\.\.\//';
                while(preg_match($remove_relatives,$path)){
                    $path = preg_replace($remove_relatives, '', $path);
                }
                //if any remain use PHP realpath to strip them out, otherwise return $path
                //if using realpath, any symlinks will also be resolved
                return preg_match('#^\.\./|/\.\./#', $path) ? realpath($path) : $path;
        }
        protected function toDelete($name){
                $this->debug(3, "Scheduling file $name to delete on destruct.");
                $this->toDeletes[] = $name;
        }
        protected function serveWebshot(){
                $this->debug(3, "Starting serveWebshot");
                $instr = "Please follow the instructions at http://code.google.com/p/timthumb/ to set your server up for taking website screenshots.";
                if(! is_file(WEBSHOT_CUTYCAPT)){
                        return $this->error("CutyCapt is not installed. $instr");
                }
                if(! is_file(WEBSHOT_XVFB)){
                        return $this->Error("Xvfb is not installed. $instr");
                }
                $cuty = WEBSHOT_CUTYCAPT;
                $xv = WEBSHOT_XVFB;
                $screenX = WEBSHOT_SCREEN_X;
                $screenY = WEBSHOT_SCREEN_Y;
                $colDepth = WEBSHOT_COLOR_DEPTH;
                $format = WEBSHOT_IMAGE_FORMAT;
                $timeout = WEBSHOT_TIMEOUT * 1000;
                $ua = WEBSHOT_USER_AGENT;
                $jsOn = WEBSHOT_JAVASCRIPT_ON ? 'on' : 'off';
                $javaOn = WEBSHOT_JAVA_ON ? 'on' : 'off';
                $pluginsOn = WEBSHOT_PLUGINS_ON ? 'on' : 'off';
                $proxy = WEBSHOT_PROXY ? ' --http-proxy=' . WEBSHOT_PROXY : '';
                $tempfile = tempnam($this->cacheDirectory, 'timthumb_webshot');
                $url = $this->src;
                if(! preg_match('/^https?:\/\/[a-zA-Z0-9\.\-]+/i', $url)){
                        return $this->error("Invalid URL supplied.");
                }
                $url = preg_replace('/[^A-Za-z0-9\-\.\_:\/\?\&\+\;\=]+/', '', $url); //RFC 3986 plus ()$ chars to prevent exploit below. Plus the following are also removed: @*!~#[]',
                // 2014 update by Mark Maunder: This exploit: http://cxsecurity.com/issue/WLB-2014060134
                // uses the $(command) shell execution syntax to execute arbitrary shell commands as the web server user. 
                // So we're now filtering out the characters: '$', '(' and ')' in the above regex to avoid this. 
                // We are also filtering out chars rarely used in URLs but legal accoring to the URL RFC which might be exploitable. These include: @*!~#[]',
                // We're doing this because we're passing this URL to the shell and need to make very sure it's not going to execute arbitrary commands. 
                if(WEBSHOT_XVFB_RUNNING){
                        putenv('DISPLAY=:100.0');
                        $command = "$cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
                } else {
                        $command = "$xv --server-args=\"-screen 0, {$screenX}x{$screenY}x{$colDepth}\" $cuty $proxy --max-wait=$timeout --user-agent=\"$ua\" --javascript=$jsOn --java=$javaOn --plugins=$pluginsOn --js-can-open-windows=off --url=\"$url\" --out-format=$format --out=$tempfile";
                }
                $this->debug(3, "Executing command: $command");
                $out = `$command`;
                $this->debug(3, "Received output: $out");
                if(! is_file($tempfile)){
                        $this->set404();
                        return $this->error("The command to create a thumbnail failed.");
                }
                $this->cropTop = true;
                if($this->processImageAndWriteToCache($tempfile)){
                        $this->debug(3, "Image processed succesfully. Serving from cache");
                        return $this->serveCacheFile();
                } else {
                        return false;
                }
        }
        protected function serveExternalImage(){
                if(! preg_match('/^https?:\/\/[a-zA-Z0-9\-\.]+/i', $this->src)){
                        $this->error("Invalid URL supplied.");
                        return false;
                }
                $tempfile = tempnam($this->cacheDirectory, 'timthumb');
                $this->debug(3, "Fetching external image into temporary file $tempfile");
                $this->toDelete($tempfile);
                #fetch file here
                if(! $this->getURL($this->src, $tempfile)){
                        @unlink($this->cachefile);
                        touch($this->cachefile);
                        $this->debug(3, "Error fetching URL: " . $this->lastURLError);
                        $this->error("Error reading the URL you specified from remote host." . $this->lastURLError);
                        return false;
                }

                $mimeType = $this->getMimeType($tempfile);
                if(! preg_match("/^image\/(?:jpg|jpeg|gif|png)$/i", $mimeType)){
                        $this->debug(3, "Remote file has invalid mime type: $mimeType");
                        @unlink($this->cachefile);
                        touch($this->cachefile);
                        $this->error("The remote file is not a valid image. Mimetype = '" . $mimeType . "'" . $tempfile);
                        return false;
                }
                if($this->processImageAndWriteToCache($tempfile)){
                        $this->debug(3, "Image processed succesfully. Serving from cache");
                        return $this->serveCacheFile();
                } else {
                        return false;
                }
        }
        public static function curlWrite($h, $d){
                fwrite(self::$curlFH, $d);
                self::$curlDataWritten += strlen($d);
                if(self::$curlDataWritten > MAX_FILE_SIZE){
                        return 0;
                } else {
                        return strlen($d);
                }
        }
        protected function serveCacheFile(){
                $this->debug(3, "Serving {$this->cachefile}");
                if(! is_file($this->cachefile)){
                        $this->error("serveCacheFile called in timthumb but we couldn't find the cached file.");
                        return false;
                }
                $fp = fopen($this->cachefile, 'rb');
                if(! $fp){ return $this->error("Could not open cachefile."); }
                fseek($fp, strlen($this->filePrependSecurityBlock), SEEK_SET);
                $imgType = fread($fp, 3);
                fseek($fp, 3, SEEK_CUR);
                if(ftell($fp) != strlen($this->filePrependSecurityBlock) + 6){
                        @unlink($this->cachefile);
                        return $this->error("The cached image file seems to be corrupt.");
                }
                $imageDataSize = filesize($this->cachefile) - (strlen($this->filePrependSecurityBlock) + 6);
                $this->sendImageHeaders($imgType, $imageDataSize);
                $bytesSent = @fpassthru($fp);
                fclose($fp);
                if($bytesSent > 0){
                        return true;
                }
                $content = file_get_contents ($this->cachefile);
                if ($content != FALSE) {
                        $content = substr($content, strlen($this->filePrependSecurityBlock) + 6);
                        echo $content;
                        $this->debug(3, "Served using file_get_contents and echo");
                        return true;
                } else {
                        $this->error("Cache file could not be loaded.");
                        return false;
                }
        }
        protected function sendImageHeaders($mimeType, $dataSize){
                if(! preg_match('/^image\//i', $mimeType)){
                        $mimeType = 'image/' . $mimeType;
                }
                if(strtolower($mimeType) == 'image/jpg'){
                        $mimeType = 'image/jpeg';
                }
                $gmdate_expires = gmdate ('D, d M Y H:i:s', strtotime ('now +10 days')) . ' GMT';
                $gmdate_modified = gmdate ('D, d M Y H:i:s') . ' GMT';
                // send content headers then display image
                header ('Content-Type: ' . $mimeType);
                header ('Accept-Ranges: none'); //Changed this because we don't accept range requests
                header ('Last-Modified: ' . $gmdate_modified);
                header ('Content-Length: ' . $dataSize);
                if(BROWSER_CACHE_DISABLE){
                        $this->debug(3, "Browser cache is disabled so setting non-caching headers.");
                        header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
                        header("Pragma: no-cache");
                        header('Expires: ' . gmdate ('D, d M Y H:i:s', time()));
                } else {
                        $this->debug(3, "Browser caching is enabled");
                        header('Cache-Control: max-age=' . BROWSER_CACHE_MAX_AGE . ', must-revalidate');
                        header('Expires: ' . $gmdate_expires);
                }
                return true;
        }
        protected function securityChecks(){
        }
        protected function param($property, $default = ''){
                if (isset ($_GET[$property])) {
                        return $_GET[$property];
                } else {
                        return $default;
                }
        }
        protected function openImage($mimeType, $src){
                switch ($mimeType) {
                        case 'image/jpeg':
                                $image = imagecreatefromjpeg ($src);
                                break;

                        case 'image/png':
                                $image = imagecreatefrompng ($src);
                                imagealphablending( $image, true );
                                imagesavealpha( $image, true );
                                break;

                        case 'image/gif':
                                $image = imagecreatefromgif ($src);
                                break;
                        
                        default:
                                $this->error("Unrecognised mimeType");
                }

                return $image;
        }
        protected function getIP(){
                $rem = @$_SERVER["REMOTE_ADDR"];
                $ff = @$_SERVER["HTTP_X_FORWARDED_FOR"];
                $ci = @$_SERVER["HTTP_CLIENT_IP"];
                if(preg_match('/^(?:192\.168|172\.16|10\.|127\.)/', $rem)){ 
                        if($ff){ return $ff; }
                        if($ci){ return $ci; }
                        return $rem;
                } else {
                        if($rem){ return $rem; }
                        if($ff){ return $ff; }
                        if($ci){ return $ci; }
                        return "UNKNOWN";
                }
        }
        protected function debug($level, $msg){
                if(DEBUG_ON && $level <= DEBUG_LEVEL){
                        $execTime = sprintf('%.6f', microtime(true) - $this->startTime);
                        $tick = sprintf('%.6f', 0);
                        if($this->lastBenchTime > 0){
                                $tick = sprintf('%.6f', microtime(true) - $this->lastBenchTime);
                        }
                        $this->lastBenchTime = microtime(true);
                        error_log("TimThumb Debug line " . __LINE__ . " [$execTime : $tick]: $msg");
                }
        }
        protected function sanityFail($msg){
                return $this->error("There is a problem in the timthumb code. Message: Please report this error at <a href='http://code.google.com/p/timthumb/issues/list'>timthumb's bug tracking page</a>: $msg");
        }
        protected function getMimeType($file){
                $info = getimagesize($file);
                if(is_array($info) && $info['mime']){
                        return $info['mime'];
                }
                return '';
        }
        protected function setMemoryLimit(){
                $inimem = ini_get('memory_limit');
                $inibytes = timthumb::returnBytes($inimem);
                $ourbytes = timthumb::returnBytes(MEMORY_LIMIT);
                if($inibytes < $ourbytes){
                        ini_set ('memory_limit', MEMORY_LIMIT);
                        $this->debug(3, "Increased memory from $inimem to " . MEMORY_LIMIT);
                } else {
                        $this->debug(3, "Not adjusting memory size because the current setting is " . $inimem . " and our size of " . MEMORY_LIMIT . " is smaller.");
                }
        }
        protected static function returnBytes($size_str){
                switch (substr ($size_str, -1))
                {
                        case 'M': case 'm': return (int)$size_str * 1048576;
                        case 'K': case 'k': return (int)$size_str * 1024;
                        case 'G': case 'g': return (int)$size_str * 1073741824;
                        default: return $size_str;
                }
        }
        
        protected function getURL($url, $tempfile){
                $this->lastURLError = false;
                $url = preg_replace('/ /', '%20', $url);
                if(function_exists('curl_init')){
                        $this->debug(3, "Curl is installed so using it to fetch URL.");
                        self::$curlFH = fopen($tempfile, 'w');
                        if(! self::$curlFH){
                                $this->error("Could not open $tempfile for writing.");
                                return false;
                        }
                        self::$curlDataWritten = 0;
                        $this->debug(3, "Fetching url with curl: $url");
                        $curl = curl_init($url);
                        curl_setopt ($curl, CURLOPT_TIMEOUT, CURL_TIMEOUT);
                        curl_setopt ($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.122 Safari/534.30");
                        curl_setopt ($curl, CURLOPT_RETURNTRANSFER, TRUE);
                        curl_setopt ($curl, CURLOPT_HEADER, 0);
                        curl_setopt ($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
                        curl_setopt ($curl, CURLOPT_WRITEFUNCTION, 'timthumb::curlWrite');
                        @curl_setopt ($curl, CURLOPT_FOLLOWLOCATION, true);
                        @curl_setopt ($curl, CURLOPT_MAXREDIRS, 10);
                        
                        $curlResult = curl_exec($curl);
                        fclose(self::$curlFH);
                        $httpStatus = curl_getinfo($curl, CURLINFO_HTTP_CODE);
                        if($httpStatus == 404){
                                $this->set404();
                        }
                        if($httpStatus == 302){
                                $this->error("External Image is Redirecting. Try alternate image url");
                                return false;
                        }
                        if($curlResult){
                                curl_close($curl);
                                return true;
                        } else {
                                $this->lastURLError = curl_error($curl);
                                curl_close($curl);
                                return false;
                        }
                } else {
                        $img = @file_get_contents ($url);
                        if($img === false){
                                $err = error_get_last();
                                if(is_array($err) && $err['message']){
                                        $this->lastURLError = $err['message'];
                                } else {
                                        $this->lastURLError = $err;
                                }
                                if(preg_match('/404/', $this->lastURLError)){
                                        $this->set404();
                                }

                                return false;
                        }
                        if(! file_put_contents($tempfile, $img)){
                                $this->error("Could not write to $tempfile.");
                                return false;
                        }
                        return true;
                }

        }
        protected function serveImg($file){
                $s = getimagesize($file);
                if(! ($s && $s['mime'])){
                        return false;
                }
                header ('Content-Type: ' . $s['mime']);
                header ('Content-Length: ' . filesize($file) );
                header ('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
                header ("Pragma: no-cache");
                $bytes = @readfile($file);
                if($bytes > 0){
                        return true;
                }
                $content = @file_get_contents ($file);
                if ($content != FALSE){
                        echo $content;
                        return true;
                }
                return false;

        }
        protected function set404(){
                $this->is404 = true;
        }
        protected function is404(){
                return $this->is404;
        }
}
