<?php	
	function resize_image($imagedata, $maxw, $maxh, $imgstyle = 'proportional') {
		$im = @imagecreatefromstring($imagedata);
		
		if ($im) { //if image is really an image
			$dw = $sw = imagesx($im);
			$dh = $sh = imagesy($im);
			switch ($imgstyle) {
				case 'proportional':
					if (($maxw < $sw) || ($maxh < $sh)) { //shrink only
						if ($sw * $maxh > $sh * $maxw) { //width must fit
							$dw = $maxw;
							$dh = $dw * $sh / $sw;
						} else { //height must fit
							$dh = $maxh;
							$dw = $dh * $sw / $sh;
						}
					}
				break;
				case 'distort':
					$dw = $maxw;
					$dh = $maxh;
				break;
				case 'square':
					if ($sw > $sh) { //landscape
						$dw = $dh = $maxh;
						$sx = ($sw - $sh) / 2;
						$sy = 0;
						$sw = $sh;
					} else { //portrait
						$dh = $dw = $maxw;
						$sx = 0;
						$sy = ($sh - $sw) /2;
						$sh = $sw;
					}
				break;
				default:
					trigger_error("UNKNOWN IMAGE RESIZE STYLE [$imgstyle]");
				break;
			}

			$im2 = imagecreatetruecolor($dw, $dh);
			if ($imgstyle == 'square') {
				imagecopyresampled($im2, $im, 0, 0, $sx, $sy, $dw, $dh, $sw, $sh);
			} else {
				imagecopyresampled($im2, $im, 0, 0, 0, 0, $dw, $dh, $sw, $sh);
			}
			ob_start();
			imagejpeg($im2, '', param('image resize quality'));
			imagedestroy($im2);
			$imagedata = ob_get_contents();
			ob_end_clean();
			imagedestroy($im);
		} else {
			trigger_error('RESIZE IMAGE RECEIVED A NON-IMAGE PARAMETER');
		}
		return $imagedata;
	}
	
	function rotate_image($imagedata, $times) {
		$times = $times % 4;
		$im = @imagecreatefromstring($imagedata);
		
		if ($im) { //if image is really an image
			$im2 = imagerotate($im, 90 * $times, 0);
			ob_start();
			imagejpeg($im2, '', param('image resize quality'));
			imagedestroy($im2);
			$imagedata = ob_get_contents();
			ob_end_clean();
			imagedestroy($im);
		} else {
			trigger_error('ROTATE IMAGE RECEIVED A NON-IMAGE PARAMETER');
		}
		return $imagedata;
	}
?>