find image size before loading image into memory

post.php

@@ -431,6 +431,40 @@
 				}
 				
 				require_once 'inc/image.php';
+				
+				if($config['imagick']) {
+					// This is tricky, because Imagick won't let us find
+					// an image's dimensions without loading it all into
+					// memory first, unlike GD which provides the
+					// getimagesize() to do exactly that. This section
+					// is why GD is required, even when using Imagick
+					// instead. There doesn't seem to be an alternative.
+					// Necessary for security, as Imagick even ignores
+					// PHP's memory limit.
+					
+					// first try GD's getimagesize()
+					if($size = @getimagesize($post['file'])) {
+						if($size[0] > $config['max_width'] || $size[1] > $config['max_height']) {
+							file_unlink($post['file']);
+							error($config['error']['maxsize']);
+						}
+					} else {
+						// GD failed
+						// TODO?
+					}
+				} else {
+					// find dimensions of an image using GD
+					if(!$size = @getimagesize($post['file'])) {
+						file_unlink($post['file']);
+						error($config['error']['invalidimg']);
+					}
+					if($size[0] > $config['max_width'] || $size[1] > $config['max_height']) {
+						file_unlink($post['file']);
+						error($config['error']['maxsize']);
+					}
+				}
+				
+				
 				// create image object
 				$image = new Image($post['file'], $post['extension']);