timthumb.php

<?php
/*
 * --- TimThumb CONFIGURATION ---
 * To edit the configs it is best to create a file called timthumb-config.php
 * and define variables you want to customize in there. It will automatically be
 * loaded by timthumb. This will save you having to re-edit these variables
 * everytime you download a new version
 */
define('VERSION', '2.8.10'); // 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.

//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', true); // 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', 3000); // Maximum image width
if (!defined('MAX_HEIGHT'))
    define('MAX_HEIGHT', 3000); // 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 load failed, please contact Bigfa in fatesinger.com'); // Image to serve if an error occurs instead of showing error message
if (!defined('PNG_IS_TRANSPARENT'))
    define('PNG_IS_TRANSPARENT', FALSE); //42 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', 90); // 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


//Image compression is enabled if either of these point to valid paths

//These are now disabled by default because the file sizes of PNGs (and GIFs) are much smaller than we used to generate.
//They only work for PNGs. GIFs and JPEGs are not affected.
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! :)
            $imgData = base64_decode("R0lGODlhUAAMAIAAAP8AAP///yH5BAAHAP8ALAAAAABQAAwAAAJpjI+py+0Po5y0OgAMjjv01YUZ\nOGplhWXfNa6JCLnWkXplrcBmW+spbwvaVr/cDyg7IoFC2KbYVC2NQ5MQ4ZNao9Ynzjl9ScNYpneb\nDULB3RP6JuPuaGfuuV4fumf8PuvqFyhYtjdoeFgAADs=");
            header('Content-Type: image/gif');
            header('Content-Length: ' . sizeof($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 set ALLOW_EXTERNAL=true.");
                }
            }
        }

        $cachePrefix = ($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');
        $html = '<ul>';
        foreach ($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']);
    }
    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  = 100;
            $new_height = 100;
        }

        // 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 * 0.09));
        } 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.");
        } //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
        //Very important we don't allow injection of shell commands here. URL is between quotes and we are only allowing through chars allowed by a the RFC
        // which AFAIKT can't be used for shell injection.
        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);
            $this->error("The remote file is not a valid image.");
            return false;
        }
        if ($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);
                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) {
                $this->set404();
            }
            if ($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;
    }
}