<?php

/*

	TimThumb script created by Tim McDaniels and Darren Hoyt with tweaks by Ben Gillbanks

	http://code.google.com/p/timthumb/

	MIT License: http://www.opensource.org/licenses/mit-license.php

	Paramters

	---------

	w: width

	h: height

	zc: zoom crop (0 or 1)

	q: quality (default is 75 and max is 100)

	HTML example: <img src="/scripts/timthumb.php?src=/images/whatever.jpg&w=150&h=200&zc=1" alt="" />

*/

/*

$sizeLimits = array(

	"100x100",

	"150x150",

);

*/

define ('CACHE_SIZE', 250);		// number of files to store before clearing cache

define ('CACHE_CLEAR', 5);		// maximum number of files to delete on each cache clear

define ('VERSION', '1.09');		// version number (to force a cache refresh

$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),

);

// sort out image source

$src = get_request("src", "");

if($src == "" || strlen($src) <= 3) {

	displayError("no image specified");

}

// clean params before use

$src = cleanSource($src);

// last modified time (for caching)

$lastModified = filemtime($src);

// get properties

$new_width 		= preg_replace("/[^0-9]+/", "", get_request("w", 0));

$new_height 	= preg_replace("/[^0-9]+/", "", get_request("h", 0));

$zoom_crop 		= preg_replace("/[^0-9]+/", "", get_request("zc", 1));

$quality 		= preg_replace("/[^0-9]+/", "", get_request("q", 80));

$filters		= get_request("f", "");

if ($new_width == 0 && $new_height == 0) {

	$new_width = 100;

	$new_height = 100;

}

// set path to cache directory (default is ./cache)

// this can be changed to a different location

$cache_dir = './cache';

// get mime type of src

$mime_type = mime_type($src);

// check to see if this image is in the cache already

check_cache( $cache_dir, $mime_type );

// if not in cache then clear some space and generate a new file

cleanCache();

ini_set('memory_limit', "30M");

// make sure that the src is gif/jpg/png

if(!valid_src_mime_type($mime_type)) {

	displayError("Invalid src mime type: " .$mime_type);

}

// check to see if GD function exist

if(!function_exists('imagecreatetruecolor')) {

	displayError("GD Library Error: imagecreatetruecolor does not exist");

}

if(strlen($src) && file_exists($src)) {

	// open the existing image

	$image = open_image($mime_type, $src);

	if($image === false) {

		displayError('Unable to open image : ' . $src);

	}

	// Get original width and height

	$width = imagesx($image);

	$height = imagesy($image);

	// don't allow new width or height to be greater than the original

	if( $new_width > $width ) {

		$new_width = $width;

	}

	if( $new_height > $height ) {

		$new_height = $height;

	}

	// generate new w/h if not provided

	if( $new_width && !$new_height ) {

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

	} elseif($new_height && !$new_width) {

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

	} elseif(!$new_width && !$new_height) {

		$new_width = $width;

		$new_height = $height;

	}

	// create a new true color image

	$canvas = imagecreatetruecolor( $new_width, $new_height );

	imagealphablending($canvas, false);

	// Create a new transparent color for image

	$color = imagecolorallocatealpha($canvas, 0, 0, 0, 127);

	// Completely fill the background of the new image with allocated color.

	imagefill($canvas, 0, 0, $color);

	// Restore transparency blending

	imagesavealpha($canvas, true);

	if( $zoom_crop ) {

		$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 );

		} elseif ( $cmp_y > $cmp_x ) {

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

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

		}

		imagecopyresampled( $canvas, $image, 0, 0, $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 != "") {

		// 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;

					}

				}

				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;

					default:

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

						break;

				}

			}

		}

	}

	// output image to browser based on mime type

	show_image($mime_type, $canvas, $cache_dir);

	// remove image from memory

	imagedestroy($canvas);

} else {

	if(strlen($src)) {

		displayError("image " . $src . " not found");

	} else {

		displayError("no source specified");

	}

}

/**

 * 

 */

function show_image($mime_type, $image_resized, $cache_dir) {

	global $quality;

	// check to see if we can write to the cache directory

	$is_writable = 0;

	$cache_file_name = $cache_dir . '/' . get_cache_file();

	if(touch($cache_file_name)) {

		// give 666 permissions so that the developer 

		// can overwrite web server user

		chmod($cache_file_name, 0666);

		$is_writable = 1;

	} else {

		$cache_file_name = NULL;

		header('Content-type: ' . $mime_type);

	}

	$quality = floor($quality * 0.09);

	imagepng($image_resized, $cache_file_name, $quality);

	if($is_writable) {

		show_cache_file($cache_dir, $mime_type);

	}

	imagedestroy($image_resized);

	displayError("error showing image");

}

/**

 * 

 */

function get_request( $property, $default = 0 ) {

	if( isset($_REQUEST[$property]) ) {

		return $_REQUEST[$property];

	} else {

		return $default;

	}

}

/**

 * 

 */

function open_image($mime_type, $src) {

	if(stristr($mime_type, 'gif')) {

		$image = imagecreatefromgif($src);

	} elseif(stristr($mime_type, 'jpeg')) {

		@ini_set('gd.jpeg_ignore_warning', 1);

		$image = imagecreatefromjpeg($src);

	} elseif( stristr($mime_type, 'png')) {

		$image = imagecreatefrompng($src);

	}

	return $image;

}

/**

 * clean out old files from the cache

 * you can change the number of files to store and to delete per loop in the defines at the top of the code

 */

function cleanCache() {

	$files = glob("cache/*", GLOB_BRACE);

	$yesterday = time() - (24 * 60 * 60);

	if (count($files) > 0) {

		usort($files, "filemtime_compare");

		$i = 0;

		if (count($files) > CACHE_SIZE) {

			foreach ($files as $file) {

				$i ++;

				if ($i >= CACHE_CLEAR) {

					return;

				}

				if (filemtime($file) > $yesterday) {

					return;

				}

				unlink($file);

			}

		}

	}

}

/**

 * compare the file time of two files

 */

function filemtime_compare($a, $b) {

	return filemtime($a) - filemtime($b);

}

/**

 * determine the file mime type

 */

function mime_type($file) {

	if (stristr(PHP_OS, 'WIN')) { 

		$os = 'WIN';

	} else { 

		$os = PHP_OS;

	}

	$mime_type = '';

	if (function_exists('mime_content_type')) {

		$mime_type = mime_content_type($file);

	}

	// use PECL fileinfo to determine mime type

	if (!valid_src_mime_type($mime_type)) {

		if (function_exists('finfo_open')) {

			$finfo = finfo_open(FILEINFO_MIME);

			$mime_type = finfo_file($finfo, $file);

			finfo_close($finfo);

		}

	}

	// try to determine mime type by using unix file command

	// this should not be executed on windows

    if (!valid_src_mime_type($mime_type) && $os != "WIN") {

		if (preg_match("/FREEBSD|LINUX/", $os)) {

			$mime_type = trim(@shell_exec('file -bi "' . $file . '"'));

		}

	}

	// use file's extension to determine mime type

	if (!valid_src_mime_type($mime_type)) {

		// set defaults

		$mime_type = 'image/png';

		// file details

		$fileDetails = pathinfo($file);

		$ext = strtolower($fileDetails["extension"]);

		// mime types

		$types = array(

 			'jpg'  => 'image/jpeg',

 			'jpeg' => 'image/jpeg',

 			'png'  => 'image/png',

 			'gif'  => 'image/gif'

 		);

		if (strlen($ext) && strlen($types[$ext])) {

			$mime_type = $types[$ext];

		}

	}

	return $mime_type;

}

/**

 * 

 */

function valid_src_mime_type($mime_type) {

	if (preg_match("/jpg|jpeg|gif|png/i", $mime_type)) {

		return true;

	}

	return false;

}

/**

 * 

 */

function check_cache($cache_dir, $mime_type) {

	// make sure cache dir exists

	if (!file_exists($cache_dir)) {

		// give 777 permissions so that developer can overwrite