<?php
/**
* @copyright 2005 Alessandro Pasotti
* @license GPL
* @author Alessandro Pasotti (some source grabbed somewhere)
*
* Read an image file and send a scaled thumbnail to the browser
* default to 150 px width.
*
* This file can also be included, in this case, define vars in the calling script
*
* @param string $img_path image file path, relative to this script, if not
* set, the next is checked on GET
* @param string $img urlencoded image file path, relative to this script
* (in vncms should be 2 level depth)
* @param integer $width max width
* @param integer $height max height
* @param string $jpgfilename optional filename to store image in, if
* not given, image is outputted to the browser
*
*
* Example calls:
*
* getthumb.php?img=../../images/logo.jpg --> default to max 150 (w or h)
* getthumb.php?img=../../images/logo.jpg&height=200 --> resize to 200px height
*
*
*/
// Constants
define('DEF_WIDTH', 150); // default
define('DEF_HEIGHT', 150); // default
define('ALLOWED_WIDTH', 1024); // no tampering: set up a max
define('ALLOWED_HEIGHT',768); // no tampering: set up a max
define('DEF_QUALITY', 90); // default quality
define('DEBUG', false);
// I put this here to avoid any external dependency
if(!function_exists('__clean')) {
function __clean($s, $len){
if(!isset($s)) return null;
$s = substr($s, 0, $len);
if(ini_get('gpc_magic_quotes') != 1) $s = addslashes($s);
$s = escapeshellcmd($s);
return $s;
}
}
// Get image location if not defined elsewhere
if(!isset($image_path)) $image_path = urldecode(stripslashes(__clean($_GET['img'], 256)));
if(!isset($width)) $width = __clean($_GET['width'], 4);
if(!isset($height)) $height = __clean($_GET['height'], 4);
// if both are not defined:
if(!$width && !$height) {
$width = DEF_WIDTH;
$height= DEF_HEIGHT;
}
if($width) $width = min(ALLOWED_WIDTH, $width);
else $width = ALLOWED_WIDTH;
if($height) $height = min(ALLOWED_HEIGHT, $height);
else $height = ALLOWED_HEIGHT;
define('MAX_HEIGHT', $height);
define('MAX_WIDTH' , $width);
// Load image
$img = null;
$imginfo = getimagesize($image_path);
$imgtype = $imginfo[2];
$ext = strtolower(end(explode('.', $image_path)));
if ($imgtype == IMAGETYPE_JPEG) {
$img = @imagecreatefromjpeg($image_path);
} else if ($imgtype == IMAGETYPE_PNG) {
$img = @imagecreatefrompng($image_path);
//echo "IMGEBASE " . IMAGE_BASE . ' path: ' . $image_path; exit;
// Only if your version of GD includes GIF support
} else if ($imgtype == IMAGETYPE_GIF) {
$img = @imagecreatefromgif($image_path);
}
// If an image was successfully loaded, test the image for size
if ($img) {
// Get image size and scale ratio
$width = imagesx($img);
$height = imagesy($img);
$scale = min(MAX_WIDTH/$width, MAX_HEIGHT/$height);
if(defined('DEBUG') && DEBUG) {
user_error("thumbnails.php - IMAGE: $image_path WIDTH: $width HEIGHT: $height SCALE: $scale<hr />");
exit;
}
// If the image is larger than max shrink it
if ($scale < 1) {
$new_width = floor($scale*$width);
$new_height = floor($scale*$height);
// Create a new temporary image
$tmp_img = imagecreatetruecolor($new_width, $new_height);
// Copy and resize old image into new image
imagecopyresized($tmp_img, $img, 0, 0, 0, 0,
$new_width, $new_height, $width, $height);
imagedestroy($img);
$img = $tmp_img;
}
}
// Create error image if necessary
if (!$img) {
$img = imagecreate(DEF_WIDTH, DEF_HEIGHT);
imagecolorallocate($img,255,255,255);
$c2 = imagecolorallocate($img,255,0,0);
imageline($img,0,0,DEF_WIDTH,DEF_HEIGHT,$c2);
imageline($img,DEF_WIDTH,0,0,DEF_HEIGHT,$c2);
}
if(!$jpgfilename) {
// Display the image
header("Content-type: image/jpg");
imagejpeg($img, null, DEF_QUALITY);
exit;
} else {
if(defined('DEBUG') && DEBUG) {
echo "thumbnails.php - saving to $jpgfilename<hr>";
}
imagejpeg($img, $jpgfilename, DEF_QUALITY);
}
?>
