phpThumb.php

Go to the documentation of this file.

<?php
//        available at http://phpthumb.sourceforge.net     ///
// See: phpthumb.changelog.txt for recent changes           //
// See: phpthumb.readme.txt for usage instructions          //
//                                                         ///

error_reporting(E_ALL);
ini_set('display_errors', '1');
ini_set('magic_quotes_runtime', '0');
if (ini_get('magic_quotes_runtime')) {
        die('"magic_quotes_runtime" is set in php.ini, cannot run phpThumb with this enabled');
}
$starttime = array_sum(explode(' ', microtime()));

// this script relies on the superglobal arrays, fake it here for old PHP versions
if (phpversion() < '4.1.0') {
        $_SERVER = $HTTP_SERVER_VARS;
        $_GET    = $HTTP_GET_VARS;
}

function SendSaveAsFileHeaderIfNeeded() {
        if (headers_sent()) {
                return false;
        }
        global $phpThumb;
        $downloadfilename = phpthumb_functions::SanitizeFilename(@$_GET['sia'] ? $_GET['sia'] : (@$_GET['down'] ? $_GET['down'] : 'phpThumb_generated_thumbnail'.(@$_GET['f'] ? $_GET['f'] : 'jpg')));
        if (@$downloadfilename) {
                $phpThumb->DebugMessage('SendSaveAsFileHeaderIfNeeded() sending header: Content-Disposition: '.(@$_GET['down'] ? 'attachment' : 'inline').'; filename="'.$downloadfilename.'"', __FILE__, __LINE__);
                header('Content-Disposition: '.(@$_GET['down'] ? 'attachment' : 'inline').'; filename="'.$downloadfilename.'"');
        }
        return true;
}

function PasswordStrength($password) {
        $strength = 0;
        $strength += strlen(preg_replace('#[^a-z]#',       '', $password)) * 0.5; // lowercase characters are weak
        $strength += strlen(preg_replace('#[^A-Z]#',       '', $password)) * 0.8; // uppercase characters are somewhat better
        $strength += strlen(preg_replace('#[^0-9]#',       '', $password)) * 1.0; // numbers are somewhat better
        $strength += strlen(preg_replace('#[a-zA-Z0-9]#',  '', $password)) * 2.0; // other non-alphanumeric characters are best
        return $strength;
}

function RedirectToCachedFile() {
        global $phpThumb, $PHPTHUMB_CONFIG;

        $nice_cachefile = str_replace(DIRECTORY_SEPARATOR, '/', $phpThumb->cache_filename);
        $nice_docroot   = str_replace(DIRECTORY_SEPARATOR, '/', rtrim($PHPTHUMB_CONFIG['document_root'], '/\\'));

        $parsed_url = phpthumb_functions::ParseURLbetter(@$_SERVER['HTTP_REFERER']);

        $nModified  = filemtime($phpThumb->cache_filename);

        if ($phpThumb->config_nooffsitelink_enabled && @$_SERVER['HTTP_REFERER'] && !in_array(@$parsed_url['host'], $phpThumb->config_nooffsitelink_valid_domains)) {

                $phpThumb->DebugMessage('Would have used cached (image/'.$phpThumb->thumbnailFormat.') file "'.$phpThumb->cache_filename.'" (Last-Modified: '.gmdate('D, d M Y H:i:s', $nModified).' GMT), but skipping because $_SERVER[HTTP_REFERER] ('.@$_SERVER['HTTP_REFERER'].') is not in $phpThumb->config_nooffsitelink_valid_domains ('.implode(';', $phpThumb->config_nooffsitelink_valid_domains).')', __FILE__, __LINE__);

        } elseif ($phpThumb->phpThumbDebug) {

                $phpThumb->DebugTimingMessage('skipped using cached image', __FILE__, __LINE__);
                $phpThumb->DebugMessage('Would have used cached file, but skipping due to phpThumbDebug', __FILE__, __LINE__);
                $phpThumb->DebugMessage('* Would have sent headers (1): Last-Modified: '.gmdate('D, d M Y H:i:s', $nModified).' GMT', __FILE__, __LINE__);
                if ($getimagesize = @GetImageSize($phpThumb->cache_filename)) {
                        $phpThumb->DebugMessage('* Would have sent headers (2): Content-Type: '.phpthumb_functions::ImageTypeToMIMEtype($getimagesize[2]), __FILE__, __LINE__);
                }
                if (preg_match('#^'.preg_quote($nice_docroot).'(.*)$#', $nice_cachefile, $matches)) {
                        $phpThumb->DebugMessage('* Would have sent headers (3): Location: '.dirname($matches[1]).'/'.urlencode(basename($matches[1])), __FILE__, __LINE__);
                } else {
                        $phpThumb->DebugMessage('* Would have sent data: readfile('.$phpThumb->cache_filename.')', __FILE__, __LINE__);
                }

        } else {

                if (headers_sent()) {
                        $phpThumb->ErrorImage('Headers already sent ('.basename(__FILE__).' line '.__LINE__.')');
                        exit;
                }
                SendSaveAsFileHeaderIfNeeded();

                header('Last-Modified: '.gmdate('D, d M Y H:i:s', $nModified).' GMT');
                if (@$_SERVER['HTTP_IF_MODIFIED_SINCE'] && ($nModified == strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])) && @$_SERVER['SERVER_PROTOCOL']) {
                        header($_SERVER['SERVER_PROTOCOL'].' 304 Not Modified');
                        exit;
                }

                if ($getimagesize = @GetImageSize($phpThumb->cache_filename)) {
                        header('Content-Type: '.phpthumb_functions::ImageTypeToMIMEtype($getimagesize[2]));
                } elseif (preg_match('#\\.ico$#i', $phpThumb->cache_filename)) {
                        header('Content-Type: image/x-icon');
                }
                if (!@$PHPTHUMB_CONFIG['cache_force_passthru'] && preg_match('#^'.preg_quote($nice_docroot).'(.*)$#', $nice_cachefile, $matches)) {
                        header('Location: '.dirname($matches[1]).'/'.urlencode(basename($matches[1])));
                } else {
                        @readfile($phpThumb->cache_filename);
                }
                exit;

        }
        return true;
}



// instantiate a new phpThumb() object
ob_start();
if (!include_once(dirname(__FILE__).'/phpthumb.class.php')) {
        ob_end_flush();
        die('failed to include_once("'.realpath(dirname(__FILE__).'/phpthumb.class.php').'")');
}
ob_end_clean();

$phpThumb = new phpThumb();
$phpThumb->DebugTimingMessage('phpThumb.php start', __FILE__, __LINE__, $starttime);
$phpThumb->SetParameter('config_error_die_on_error', true);

if (!phpthumb_functions::FunctionIsDisabled('set_time_limit')) {
        set_time_limit(60);  // shouldn't take nearly this long in most cases, but with many filters and/or a slow server...
}

// phpThumbDebug[0] used to be here, but may reveal too much
// info when high_security_mode should be enabled (not set yet)

if (file_exists(dirname(__FILE__).'/phpThumb.config.php')) {
        ob_start();
        if (include_once(dirname(__FILE__).'/phpThumb.config.php')) {
                // great
        } else {
                ob_end_flush();
                $phpThumb->config_disable_debug = false; // otherwise error message won't print
                $phpThumb->ErrorImage('failed to include_once('.dirname(__FILE__).'/phpThumb.config.php) - realpath="'.realpath(dirname(__FILE__).'/phpThumb.config.php').'"');
        }
        ob_end_clean();
} elseif (file_exists(dirname(__FILE__).'/phpThumb.config.php.default')) {
        $phpThumb->config_disable_debug = false; // otherwise error message won't print
        $phpThumb->ErrorImage('Please rename "phpThumb.config.php.default" to "phpThumb.config.php"');
} else {
        $phpThumb->config_disable_debug = false; // otherwise error message won't print
        $phpThumb->ErrorImage('failed to include_once('.dirname(__FILE__).'/phpThumb.config.php) - realpath="'.realpath(dirname(__FILE__).'/phpThumb.config.php').'"');
}

if (empty($PHPTHUMB_CONFIG['disable_pathinfo_parsing']) && (empty($_GET) || isset($_GET['phpThumbDebug'])) && !empty($_SERVER['PATH_INFO'])) {
        $_SERVER['PHP_SELF'] = str_replace($_SERVER['PATH_INFO'], '', @$_SERVER['PHP_SELF']);

        $args = explode(';', substr($_SERVER['PATH_INFO'], 1));
        $phpThumb->DebugMessage('PATH_INFO.$args set to ('.implode(')(', $args).')', __FILE__, __LINE__);
        if (!empty($args)) {
                $_GET['src'] = @$args[count($args) - 1];
                $phpThumb->DebugMessage('PATH_INFO."src" = "'.$_GET['src'].'"', __FILE__, __LINE__);
                if (preg_match('#^new\=([a-z0-9]+)#i', $_GET['src'], $matches)) {
                        unset($_GET['src']);
                        $_GET['new'] = $matches[1];
                }
        }
        if (preg_match('#^([0-9]*)x?([0-9]*)$#i', @$args[count($args) - 2], $matches)) {
                $_GET['w'] = $matches[1];
                $_GET['h'] = $matches[2];
                $phpThumb->DebugMessage('PATH_INFO."w"x"h" set to "'.$_GET['w'].'"x"'.$_GET['h'].'"', __FILE__, __LINE__);
        }
        for ($i = 0; $i < count($args) - 2; $i++) {
                @list($key, $value) = explode('=', @$args[$i]);
                if (substr($key, -2) == '[]') {
                        $array_key_name = substr($key, 0, -2);
                        $_GET[$array_key_name][] = $value;
                        $phpThumb->DebugMessage('PATH_INFO."'.$array_key_name.'[]" = "'.$value.'"', __FILE__, __LINE__);
                } else {
                        $_GET[$key] = $value;
                        $phpThumb->DebugMessage('PATH_INFO."'.$key.'" = "'.$value.'"', __FILE__, __LINE__);
                }
        }
}

if (!empty($PHPTHUMB_CONFIG['high_security_enabled'])) {
        if (empty($_GET['hash'])) {
                $phpThumb->config_disable_debug = false; // otherwise error message won't print
                $phpThumb->ErrorImage('ERROR: missing hash');
        } elseif (PasswordStrength($PHPTHUMB_CONFIG['high_security_password']) < 20) {
                $phpThumb->config_disable_debug = false; // otherwise error message won't print
                $phpThumb->ErrorImage('ERROR: $PHPTHUMB_CONFIG[high_security_password] is not complex enough');
        } elseif ($_GET['hash'] != md5(str_replace('&hash='.$_GET['hash'], '', $_SERVER['QUERY_STRING']).$PHPTHUMB_CONFIG['high_security_password'])) {
                sleep(10); // deliberate delay to discourage password-guessing
                $phpThumb->config_disable_debug = false; // otherwise error message won't print
                $phpThumb->ErrorImage('ERROR: invalid hash');
        }
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[0]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '0')) {
        $phpThumb->phpThumbDebug();
}

// returned the fixed string if the evil "magic_quotes_gpc" setting is on
if (get_magic_quotes_gpc()) {
        // deprecated: 'err', 'file', 'goto',
        $RequestVarsToStripSlashes = array('src', 'wmf', 'down');
        foreach ($RequestVarsToStripSlashes as $key) {
                if (isset($_GET[$key])) {
                        if (is_string($_GET[$key])) {
                                $_GET[$key] = stripslashes($_GET[$key]);
                        } else {
                                unset($_GET[$key]);
                        }
                }
        }
}

if (empty($_SERVER['PATH_INFO']) && empty($_SERVER['QUERY_STRING'])) {
        $phpThumb->config_disable_debug = false; // otherwise error message won't print
        $phpThumb->ErrorImage('ERROR: no parameters specified');
}

if (@$_GET['src'] && isset($_GET['md5s']) && empty($_GET['md5s'])) {
        if (preg_match('#^(f|ht)tps?://#i', $_GET['src'])) {
                if ($rawImageData = phpthumb_functions::SafeURLread($_GET['src'], $error, $phpThumb->config_http_fopen_timeout, $phpThumb->config_http_follow_redirect)) {
                        $md5s = md5($rawImageData);
                }
        } else {
                $SourceFilename = $phpThumb->ResolveFilenameToAbsolute($_GET['src']);
                if (is_readable($SourceFilename)) {
                        $md5s = phpthumb_functions::md5_file_safe($SourceFilename);
                } else {
                        $phpThumb->ErrorImage('ERROR: "'.$SourceFilename.'" cannot be read');
                }
        }
        if (@$_SERVER['HTTP_REFERER']) {
                $phpThumb->ErrorImage('&md5s='.$md5s);
        } else {
                die('&md5s='.$md5s);
        }
}

if (!empty($PHPTHUMB_CONFIG)) {
        foreach ($PHPTHUMB_CONFIG as $key => $value) {
                $keyname = 'config_'.$key;
                $phpThumb->setParameter($keyname, $value);
                if (!preg_match('#(password|mysql)#i', $key)) {
                        $phpThumb->DebugMessage('setParameter('.$keyname.', '.$phpThumb->phpThumbDebugVarDump($value).')', __FILE__, __LINE__);
                }
        }
} else {
        $phpThumb->DebugMessage('$PHPTHUMB_CONFIG is empty', __FILE__, __LINE__);
}

if (@$_GET['src'] && !@$PHPTHUMB_CONFIG['allow_local_http_src'] && preg_match('#^http://'.@$_SERVER['HTTP_HOST'].'(.+)#i', @$_GET['src'], $matches)) {
        $phpThumb->ErrorImage('It is MUCH better to specify the "src" parameter as "'.$matches[1].'" instead of "'.$matches[0].'".'."\n\n".'If you really must do it this way, enable "allow_local_http_src" in phpThumb.config.php');
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[1]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '1')) {
        $phpThumb->phpThumbDebug();
}

$parsed_url_referer = phpthumb_functions::ParseURLbetter(@$_SERVER['HTTP_REFERER']);
if ($phpThumb->config_nooffsitelink_require_refer && !in_array(@$parsed_url_referer['host'], $phpThumb->config_nohotlink_valid_domains)) {
        $phpThumb->ErrorImage('config_nooffsitelink_require_refer enabled and '.(@$parsed_url_referer['host'] ? '"'.$parsed_url_referer['host'].'" is not an allowed referer' : 'no HTTP_REFERER exists'));
}
$parsed_url_src = phpthumb_functions::ParseURLbetter(@$_GET['src']);
if ($phpThumb->config_nohotlink_enabled && $phpThumb->config_nohotlink_erase_image && preg_match('#^(f|ht)tps?://#i', @$_GET['src']) && !in_array(@$parsed_url_src['host'], $phpThumb->config_nohotlink_valid_domains)) {
        $phpThumb->ErrorImage($phpThumb->config_nohotlink_text_message);
}

if ($phpThumb->config_mysql_query) {
        if ($cid = @mysql_connect($phpThumb->config_mysql_hostname, $phpThumb->config_mysql_username, $phpThumb->config_mysql_password)) {
                if (@mysql_select_db($phpThumb->config_mysql_database, $cid)) {
                        if ($result = @mysql_query($phpThumb->config_mysql_query, $cid)) {
                                if ($row = @mysql_fetch_array($result)) {

                                        mysql_free_result($result);
                                        mysql_close($cid);
                                        $phpThumb->setSourceData($row[0]);
                                        unset($row);

                                } else {
                                        mysql_free_result($result);
                                        mysql_close($cid);
                                        $phpThumb->ErrorImage('no matching data in database.');
                                }
                        } else {
                                mysql_close($cid);
                                $phpThumb->ErrorImage('Error in MySQL query: "'.mysql_error($cid).'"');
                        }
                } else {
                        mysql_close($cid);
                        $phpThumb->ErrorImage('cannot select MySQL database: "'.mysql_error($cid).'"');
                }
        } else {
                $phpThumb->ErrorImage('cannot connect to MySQL server');
        }
        unset($_GET['id']);
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[2]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '2')) {
        $phpThumb->phpThumbDebug();
}

$PHPTHUMB_DEFAULTS_DISABLEGETPARAMS = (bool) (@$PHPTHUMB_CONFIG['cache_default_only_suffix'] && (strpos($PHPTHUMB_CONFIG['cache_default_only_suffix'], '*') !== false));

if (!empty($PHPTHUMB_DEFAULTS) && is_array($PHPTHUMB_DEFAULTS)) {
        $phpThumb->DebugMessage('setting $PHPTHUMB_DEFAULTS['.implode(';', array_keys($PHPTHUMB_DEFAULTS)).']', __FILE__, __LINE__);
        foreach ($PHPTHUMB_DEFAULTS as $key => $value) {
                if ($PHPTHUMB_DEFAULTS_GETSTRINGOVERRIDE || !isset($_GET[$key])) {
                        $_GET[$key] = $value;
                        $phpThumb->DebugMessage('PHPTHUMB_DEFAULTS assigning ('.$value.') to $_GET['.$key.']', __FILE__, __LINE__);
                }
        }
}

// deprecated: 'err', 'file', 'goto',
$allowedGETparameters = array('src', 'new', 'w', 'h', 'wp', 'hp', 'wl', 'hl', 'ws', 'hs', 'f', 'q', 'sx', 'sy', 'sw', 'sh', 'zc', 'bc', 'bg', 'bgt', 'fltr', 'xto', 'ra', 'ar', 'aoe', 'far', 'iar', 'maxb', 'down', 'phpThumbDebug', 'hash', 'md5s', 'sfn', 'dpi', 'sia', 'nocache');
foreach ($_GET as $key => $value) {
        if (!empty($PHPTHUMB_DEFAULTS_DISABLEGETPARAMS) && ($key != 'src')) {
                // disabled, do not set parameter
                $phpThumb->DebugMessage('ignoring $_GET['.$key.'] because of $PHPTHUMB_DEFAULTS_DISABLEGETPARAMS', __FILE__, __LINE__);
        } elseif (in_array($key, $allowedGETparameters)) {
                $phpThumb->DebugMessage('setParameter('.$key.', '.$phpThumb->phpThumbDebugVarDump($value).')', __FILE__, __LINE__);
                $phpThumb->setParameter($key, $value);
        } else {
                $phpThumb->ErrorImage('Forbidden parameter: '.$key);
        }
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[3]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '3')) {
        $phpThumb->phpThumbDebug();
}

//if (!@$_GET['phpThumbDebug'] && !is_file($phpThumb->sourceFilename) && !phpthumb_functions::gd_version()) {
//      if (!headers_sent()) {
//              // base64-encoded error image in GIF format
//              $ERROR_NOGD = 'R0lGODlhIAAgALMAAAAAABQUFCQkJDY2NkZGRldXV2ZmZnJycoaGhpSUlKWlpbe3t8XFxdXV1eTk5P7+/iwAAAAAIAAgAAAE/vDJSau9WILtTAACUinDNijZtAHfCojS4W5H+qxD8xibIDE9h0OwWaRWDIljJSkUJYsN4bihMB8th3IToAKs1VtYM75cyV8sZ8vygtOE5yMKmGbO4jRdICQCjHdlZzwzNW4qZSQmKDaNjhUMBX4BBAlmMywFSRWEmAI6b5gAlhNxokGhooAIK5o/pi9vEw4Lfj4OLTAUpj6IabMtCwlSFw0DCKBoFqwAB04AjI54PyZ+yY3TD0ss2YcVmN/gvpcu4TOyFivWqYJlbAHPpOntvxNAACcmGHjZzAZqzSzcq5fNjxFmAFw9iFRunD1epU6tsIPmFCAJnWYE0FURk7wJDA0MTKpEzoWAAskiAAA7';
//              header('Content-Type: image/gif');
//              echo base64_decode($ERROR_NOGD);
//      } else {
//              echo '*** ERROR: No PHP-GD support available ***';
//      }
//      exit;
//}

// check to see if file can be output from source with no processing or caching
$CanPassThroughDirectly = true;
if ($phpThumb->rawImageData) {
        // data from SQL, should be fine
} elseif (preg_match('#^http\://[^\\?&]+\\.(jpe?g|gif|png)$#i', $phpThumb->src)) {
        // assume is ok to passthru if no other parameters specified
} elseif (preg_match('#^(f|ht)tp\://#i', $phpThumb->src)) {
        $phpThumb->DebugMessage('$CanPassThroughDirectly=false because preg_match("#^(f|ht)tp\://#i", '.$phpThumb->src.')', __FILE__, __LINE__);
        $CanPassThroughDirectly = false;
} elseif (!@is_readable($phpThumb->sourceFilename)) {
        $phpThumb->DebugMessage('$CanPassThroughDirectly=false because !@is_readable('.$phpThumb->sourceFilename.')', __FILE__, __LINE__);
        $CanPassThroughDirectly = false;
} elseif (!@is_file($phpThumb->sourceFilename)) {
        $phpThumb->DebugMessage('$CanPassThroughDirectly=false because !@is_file('.$phpThumb->sourceFilename.')', __FILE__, __LINE__);
        $CanPassThroughDirectly = false;
}
foreach ($_GET as $key => $value) {
        switch ($key) {
                case 'src':
                        // allowed
                        break;

                case 'w':
                case 'h':
                        // might be OK if exactly matches original
                        if (preg_match('#^http\://[^\\?&]+\\.(jpe?g|gif|png)$#i', $phpThumb->src)) {
                                // assume it is not ok for direct-passthru of remote image
                                $CanPassThroughDirectly = false;
                        }
                        break;

                case 'phpThumbDebug':
                        // handled in direct-passthru code
                        break;

                default:
                        // all other parameters will cause some processing,
                        // therefore cannot pass through original image unmodified
                        $CanPassThroughDirectly = false;
                        $UnAllowedGET[] = $key;
                        break;
        }
}
if (!empty($UnAllowedGET)) {
        $phpThumb->DebugMessage('$CanPassThroughDirectly=false because $_GET['.implode(';', array_unique($UnAllowedGET)).'] are set', __FILE__, __LINE__);
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[4]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '4')) {
        $phpThumb->phpThumbDebug();
}

$phpThumb->DebugMessage('$CanPassThroughDirectly="'.intval($CanPassThroughDirectly).'" && $phpThumb->src="'.$phpThumb->src.'"', __FILE__, __LINE__);
while ($CanPassThroughDirectly && $phpThumb->src) {
        // no parameters set, passthru

        if (preg_match('#^http\://[^\\?&]+\.(jpe?g|gif|png)$#i', $phpThumb->src)) {
                $phpThumb->DebugMessage('Passing HTTP source through directly as Location: redirect ('.$phpThumb->src.')', __FILE__, __LINE__);
                header('Location: '.$phpThumb->src);
                exit;
        }

        $SourceFilename = $phpThumb->ResolveFilenameToAbsolute($phpThumb->src);

        // security and size checks
        if ($phpThumb->getimagesizeinfo = @GetImageSize($SourceFilename)) {
                $phpThumb->DebugMessage('Direct passthru GetImageSize() returned [w='.$phpThumb->getimagesizeinfo[0].';h='.$phpThumb->getimagesizeinfo[1].';t='.$phpThumb->getimagesizeinfo[2].']', __FILE__, __LINE__);

                if (!@$_GET['w'] && !@$_GET['wp'] && !@$_GET['wl'] && !@$_GET['ws'] && !@$_GET['h'] && !@$_GET['hp'] && !@$_GET['hl'] && !@$_GET['hs']) {
                        // no resizing needed
                        $phpThumb->DebugMessage('Passing "'.$SourceFilename.'" through directly, no resizing required ("'.$phpThumb->getimagesizeinfo[0].'"x"'.$phpThumb->getimagesizeinfo[1].'")', __FILE__, __LINE__);
                } elseif (($phpThumb->getimagesizeinfo[0] <= @$_GET['w']) && ($phpThumb->getimagesizeinfo[1] <= @$_GET['h']) && ((@$_GET['w'] == $phpThumb->getimagesizeinfo[0]) || (@$_GET['h'] == $phpThumb->getimagesizeinfo[1]))) {
                        // image fits into 'w'x'h' box, and at least one dimension matches exactly, therefore no resizing needed
                        $phpThumb->DebugMessage('Passing "'.$SourceFilename.'" through directly, no resizing required ("'.$phpThumb->getimagesizeinfo[0].'"x"'.$phpThumb->getimagesizeinfo[1].'" fits inside "'.@$_GET['w'].'"x"'.@$_GET['h'].'")', __FILE__, __LINE__);
                } else {
                        $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because resizing required (from "'.$phpThumb->getimagesizeinfo[0].'"x"'.$phpThumb->getimagesizeinfo[1].'" to "'.@$_GET['w'].'"x"'.@$_GET['h'].'")', __FILE__, __LINE__);
                        break;
                }
                switch ($phpThumb->getimagesizeinfo[2]) {
                        case 1: // GIF
                        case 2: // JPG
                        case 3: // PNG
                                // great, let it through
                                break;
                        default:
                                // browser probably can't handle format, remangle it to JPEG/PNG/GIF
                                $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because $phpThumb->getimagesizeinfo[2] = "'.$phpThumb->getimagesizeinfo[2].'"', __FILE__, __LINE__);
                                break 2;
                }

                $ImageCreateFunctions = array(1=>'ImageCreateFromGIF', 2=>'ImageCreateFromJPEG', 3=>'ImageCreateFromPNG');
                $theImageCreateFunction = @$ImageCreateFunctions[$phpThumb->getimagesizeinfo[2]];
                if ($phpThumb->config_disable_onlycreateable_passthru || (function_exists($theImageCreateFunction) && ($dummyImage = @$theImageCreateFunction($SourceFilename)))) {

                        // great
                        if (@is_resource($dummyImage)) {
                                unset($dummyImage);
                        }

                        if (headers_sent()) {
                                $phpThumb->ErrorImage('Headers already sent ('.basename(__FILE__).' line '.__LINE__.')');
                                exit;
                        }
                        if (@$_GET['phpThumbDebug']) {
                                $phpThumb->DebugTimingMessage('skipped direct $SourceFilename passthru', __FILE__, __LINE__);
                                $phpThumb->DebugMessage('Would have passed "'.$SourceFilename.'" through directly, but skipping due to phpThumbDebug', __FILE__, __LINE__);
                                break;
                        }

                        SendSaveAsFileHeaderIfNeeded();
                        header('Last-Modified: '.gmdate('D, d M Y H:i:s', @filemtime($SourceFilename)).' GMT');
                        if ($contentType = phpthumb_functions::ImageTypeToMIMEtype(@$phpThumb->getimagesizeinfo[2])) {
                                header('Content-Type: '.$contentType);
                        }
                        @readfile($SourceFilename);
                        exit;

                } else {
                        $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because ($phpThumb->config_disable_onlycreateable_passthru = "'.$phpThumb->config_disable_onlycreateable_passthru.'") and '.$theImageCreateFunction.'() failed', __FILE__, __LINE__);
                        break;
                }

        } else {
                $phpThumb->DebugMessage('Not passing "'.$SourceFilename.'" through directly because GetImageSize() failed', __FILE__, __LINE__);
                break;
        }
        break;
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[5]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '5')) {
        $phpThumb->phpThumbDebug();
}

// check to see if file already exists in cache, and output it with no processing if it does
$phpThumb->SetCacheFilename();
if (@is_readable($phpThumb->cache_filename)) {
        RedirectToCachedFile();
} else {
        $phpThumb->DebugMessage('Cached file "'.$phpThumb->cache_filename.'" does not exist, processing as normal', __FILE__, __LINE__);
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[6]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '6')) {
        $phpThumb->phpThumbDebug();
}

if ($phpThumb->rawImageData) {

        // great

} elseif (!empty($_GET['new'])) {

        // generate a blank image resource of the specified size/background color/opacity
        if (($phpThumb->w <= 0) || ($phpThumb->h <= 0)) {
                $phpThumb->ErrorImage('"w" and "h" parameters required for "new"');
        }
        @list($bghexcolor, $opacity) = explode('|', $_GET['new']);
        if (!phpthumb_functions::IsHexColor($bghexcolor)) {
                $phpThumb->ErrorImage('BGcolor parameter for "new" is not valid');
        }
        $opacity = (strlen($opacity) ? $opacity : 100);
        if ($phpThumb->gdimg_source = phpthumb_functions::ImageCreateFunction($phpThumb->w, $phpThumb->h)) {
                $alpha = (100 - min(100, max(0, $opacity))) * 1.27;
                if ($alpha) {
                        $phpThumb->setParameter('is_alpha', true);
                        ImageAlphaBlending($phpThumb->gdimg_source, false);
                        ImageSaveAlpha($phpThumb->gdimg_source, true);
                }
                $new_background_color = phpthumb_functions::ImageHexColorAllocate($phpThumb->gdimg_source, $bghexcolor, false, $alpha);
                ImageFilledRectangle($phpThumb->gdimg_source, 0, 0, $phpThumb->w, $phpThumb->h, $new_background_color);
        } else {
                $phpThumb->ErrorImage('failed to create "new" image ('.$phpThumb->w.'x'.$phpThumb->h.')');
        }

} elseif (!$phpThumb->src) {

        $phpThumb->ErrorImage('Usage: '.$_SERVER['PHP_SELF'].'?src=/path/and/filename.jpg'."\n".'read Usage comments for details');

} elseif (preg_match('#^(f|ht)tp\://#i', $phpThumb->src)) {

        $phpThumb->DebugMessage('$phpThumb->src ('.$phpThumb->src.') is remote image, attempting to download', __FILE__, __LINE__);
        if ($phpThumb->config_http_user_agent) {
                $phpThumb->DebugMessage('Setting "user_agent" to "'.$phpThumb->config_http_user_agent.'"', __FILE__, __LINE__);
                ini_set('user_agent', $phpThumb->config_http_user_agent);
        }
        $cleanedupurl = phpthumb_functions::CleanUpURLencoding($phpThumb->src);
        $phpThumb->DebugMessage('CleanUpURLencoding('.$phpThumb->src.') returned "'.$cleanedupurl.'"', __FILE__, __LINE__);
        $phpThumb->src = $cleanedupurl;
        unset($cleanedupurl);
        if ($rawImageData = phpthumb_functions::SafeURLread($phpThumb->src, $error, $phpThumb->config_http_fopen_timeout, $phpThumb->config_http_follow_redirect)) {
                $phpThumb->DebugMessage('SafeURLread('.$phpThumb->src.') succeeded'.($error ? ' with messsages: "'.$error.'"' : ''), __FILE__, __LINE__);
                $phpThumb->DebugMessage('Setting source data from URL "'.$phpThumb->src.'"', __FILE__, __LINE__);
                $phpThumb->setSourceData($rawImageData, urlencode($phpThumb->src));
        } else {
                $phpThumb->ErrorImage($error);
        }
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[7]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '7')) {
        $phpThumb->phpThumbDebug();
}

$phpThumb->GenerateThumbnail();

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[8]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '8')) {
        $phpThumb->phpThumbDebug();
}

if (!empty($PHPTHUMB_CONFIG['high_security_enabled']) && !empty($_GET['nocache'])) {

        // cache disabled, don't write cachefile

} else {

        phpthumb_functions::EnsureDirectoryExists(dirname($phpThumb->cache_filename));
        if (is_writable(dirname($phpThumb->cache_filename)) || (file_exists($phpThumb->cache_filename) && is_writable($phpThumb->cache_filename))) {

                $phpThumb->CleanUpCacheDirectory();
                if ($phpThumb->RenderToFile($phpThumb->cache_filename) && is_readable($phpThumb->cache_filename)) {
                        chmod($phpThumb->cache_filename, 0644);
                        RedirectToCachedFile();
                } else {
                        $phpThumb->DebugMessage('Failed: RenderToFile('.$phpThumb->cache_filename.')', __FILE__, __LINE__);
                }

        } else {

                $phpThumb->DebugMessage('Cannot write to $phpThumb->cache_filename ('.$phpThumb->cache_filename.') because that directory ('.dirname($phpThumb->cache_filename).') is not writable', __FILE__, __LINE__);

        }

}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[9]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '9')) {
        $phpThumb->phpThumbDebug();
}

if (!$phpThumb->OutputThumbnail()) {
        $phpThumb->ErrorImage('Error in OutputThumbnail():'."\n".$phpThumb->debugmessages[(count($phpThumb->debugmessages) - 1)]);
}

// Debug output, to try and help me diagnose problems
$phpThumb->DebugTimingMessage('phpThumbDebug[10]', __FILE__, __LINE__);
if (isset($_GET['phpThumbDebug']) && ($_GET['phpThumbDebug'] == '10')) {
        $phpThumb->phpThumbDebug();
}

?>