simplify $_GET usage (move to beginning for easy escape if need be).

simplify orientation reading from big case to two small arrays.

createthumb.php

@@ -20,15 +20,18 @@ Version 0.3.5 modified by Sebastien SAUVAGE (sebsauvage.net):
 
 USAGE EXAMPLE:
 File: createthumb.php
-Example: <img src="createthumb.php?filename=photo.jpg&amp;width=100&amp;height=100">
+Example: <img src="createthumb.php?filename=photo.jpg&amp;size=100">
 */
-//	error_reporting(E_ALL);
+
 error_reporting(0);
-/*
+
-if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename'])) header('Content-type: image/jpeg');
+$get_filename = $_GET['filename'];
-if (preg_match("/.gif$/i", $_GET['filename'])) header('Content-type: image/gif');
+$get_size = @$_GET['size'];
-if (preg_match("/.png$/i", $_GET['filename'])) header('Content-type: image/png');
+if (empty($get_size)) $get_size = 120;
-*/
+
+if (preg_match("/.jpe?g$/i", $get_filename)) $get_filename_type = "JPG";
+if (preg_match("/.gif$/i", $get_filename)) $get_filename_type = "GIF";
+if (preg_match("/.png$/i", $get_filename)) $get_filename_type = "PNG";
 
 // flip functions from http://stackoverflow.com/questions/8232722/how-to-flip-part-of-an-image-horizontal-with-php-gd
 function flipVertical(&$img) {
@@ -90,7 +93,7 @@ if (!is_dir('thumbs') && is_writable('.'))
 
 // Thumbnail file name and path.
 // (We always put thumbnails in jpg for simplification)
-$thumbname = 'thumbs/'.sanitize($_GET['filename']).'.jpg';
+$thumbname = 'thumbs/'.sanitize($get_filename).'.jpg';
 
 if (file_exists($thumbname)) // If thumbnail exists, serve it.
 {
@@ -99,34 +102,34 @@ if (file_exists($thumbname))// If thumbnail exists, serve it.
 	fclose($fd);
 	header('Content-type: image/jpeg');
 	echo($cacheContent);
+	exit;
 }
-else // otherwise, generate thumbnail, send it and save it to file.
-{
 
 // Display error image if file isn't found
-	if (!is_file($_GET['filename'])) {
+if (!is_file($get_filename)) {
 	header('Content-type: image/jpeg');
-		$errorimage = ImageCreateFromJPEG('images/questionmark.jpg');
+	$errorimage = imagecreatefromjpeg('images/questionmark.jpg');
-		ImageJPEG($errorimage,null,90);
+	imagejpeg($errorimage, null, 90);
+	imagedestroy($errorimage);
+	exit;
 }
 
 // Display error image if file exists, but can't be opened
-	if (substr(decoct(fileperms($_GET['filename'])), -1, strlen(fileperms($_GET['filename']))) < 4 OR substr(decoct(fileperms($_GET['filename'])), -3,1) < 4) {
+if (!is_readable($get_filename)) {
 	header('Content-type: image/jpeg');
-		$errorimage = ImageCreateFromJPEG('images/cannotopen.jpg');
+	$errorimage = imagecreatefromjpeg('images/cannotopen.jpg');
-		ImageJPEG($errorimage,null,90);
+	imagejpeg($errorimage, null, 90);
+	imagedestroy($errorimage);
+	exit;
 }
 
-	// Define variables
+// otherwise, generate thumbnail, send it and save it to file.
+
 $target = "";
 $xoord = 0;
 $yoord = 0;
 
-	if ($_GET['size'] == "")
+$imgsize = getimagesize($get_filename);
-	{
-		$_GET['size'] = 120;
-	}
-	$imgsize = GetImageSize($_GET['filename']);
 $width = $imgsize[0];
 $height = $imgsize[1];
 if ($width > $height) // If the width is greater than the height it’s a horizontal picture
@@ -140,78 +143,49 @@ else // otherwise, generate thumbnail, send it and save it to file.
 	$height = $width;
 }
 
+// Rotate JPG pictures
 $degrees = 0;
 $flip = '';
-	// Rotate JPG pictures
+if ($get_filename_type == "JPG")
-	if (preg_match("/.jpg$|.jpeg$/i", $_GET['filename']))
 {
 	if (function_exists('exif_read_data') && function_exists('imagerotate'))
 	{
-			$exif = exif_read_data($_GET['filename'], 0, true);
+		$exif = exif_read_data($get_filename, 0, true);
 		if (isset($exif['IFD0']) && isset($exif['IFD0']['Orientation']))
 			$ort = $exif['IFD0']['Orientation'];
 		else
 			$ort = 0;
-			switch($ort)
+		// for more info on orientation see
-			{
+		// http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/
-				case 3: // 180 rotate right
+		$ort2deg = array(3=>180, 4=>180, 5=>270, 6=>270, 7=>90, 8=>90);
-					$degrees = 180;
+		$degrees = in_array($ort, $ort2deg) ? $ort2deg[$ort] : 0;
-				break;
+		$ort2flip = array(2, 4, 5, 7);
-				case 6: // 90 rotate right
+		$flip = in_array($ort, $flip2deg) ? 'vertical' : '';
-					$degrees = 270;
-				break;
-				case 8:	// 90 rotate left
-					$degrees = 90;
-				break;
-				case 2: // flip vertical
-					$flip = 'vertical';
-				break;
-				// see http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/ for more info on orientation
-				case 7: // flipped
-					$degrees = 90;
-					$flip = 'vertical';
-				break;
-				case 5: // flipped
-					$degrees = 270;
-					$flip = 'vertical';
-				break;
-				case 4: // flipped
-					$degrees = 180;
-					$flip = 'vertical';
-				break;
-			}
 	}
 }
 
-	$target = ImageCreatetruecolor($_GET['size'],$_GET['size']);
+$target = imagecreatetruecolor($get_size, $get_size);
 
 // if the picture can be transparent, add a white background instead a black
-	if (preg_match("/.gif$/i", $_GET['filename']) || preg_match("/.png$/i", $_GET['filename'])) 
+if (in_array($get_filename_type, array("GIF", "PNG")))
 {
 	$backgroundColor = imagecolorallocate($target, 255, 255, 255);
 	imagefill($target, 0, 0, $backgroundColor);
 }
 
 
-	if (preg_match("/.jpg$/i", $_GET['filename'])) $source = ImageCreateFromJPEG($_GET['filename']);
+if ($get_filename_type == "JPG") $source = imagecreatefromjpeg($get_filename);
-	if (preg_match("/.gif$/i", $_GET['filename'])) $source = ImageCreateFromGIF($_GET['filename']);
+if ($get_filename_type == "GIF") $source = imagecreatefromgif($get_filename);
-	if (preg_match("/.png$/i", $_GET['filename'])) $source = ImageCreateFromPNG($_GET['filename']);
+if ($get_filename_type == "PNG") $source = imagecreatefrompng($get_filename);
-	imagecopyresampled($target,$source,0,0,$xoord,$yoord,$_GET['size'],$_GET['size'],$width,$height);
+imagecopyresampled($target, $source, 0, 0, $xoord, $yoord, $get_size, $get_size, $width, $height);
 imagedestroy($source);
 
-	//if (preg_match("/.jpg$/i", $_GET['filename'])) ImageJPEG($target,null,90);
-	//if (preg_match("/.gif$/i", $_GET['filename'])) ImageGIF($target,null,90);
-	//if (preg_match("/.png$/i", $_GET['filename'])) ImageJPEG($target,null,90); // Using ImageJPEG on purpose
-
 //proper rotation by jan niggemann
 if ($degrees != 0)
 {
 	$target = imagerotate($target, $degrees, 0);
 }
 
-	ob_start(); // Start output buffering.
-	header('Content-type: image/jpeg'); // We always render the thumbnail in JPEG even if the source is GIF or PNG.
-
 //proper mirror (aka flip) by jan niggemann
 if ($flip == 'vertical')
 {
@@ -220,13 +194,16 @@ else // otherwise, generate thumbnail, send it and save it to file.
 	flipHorizontal($target);
 	flipVertical($target);
 }
-	ImageJPEG($target,null,80);
 
+ob_start(); // Start output buffering.
+header('Content-type: image/jpeg'); // We always render the thumbnail in JPEG even if the source is GIF or PNG.
+imagejpeg($target, null, 80);
 imagedestroy($target);
-
 $cachedImage = ob_get_contents(); // Get the buffer content.
 ob_end_flush(); // End buffering
-	if (is_writable(dirname($thumbname))) {
+
+if (is_writable(dirname($thumbname)))
+{
 	$fd = fopen($thumbname, "w"); // Save buffer to disk
 	if ($fd)
 	{
@@ -234,6 +211,6 @@ else // otherwise, generate thumbnail, send it and save it to file.
 		fclose($fd);
 	}
 }
-}
+
 
 ?>