Ability to strip excess data (commonly ZIP archives) from images.

inc/config.php

@@ -53,6 +53,15 @@
 	define('MAX_WIDTH',		10000);
 	define('MAX_HEIGHT',	MAX_WIDTH);
 	
+	/**
+		Redraw the image using GD functions to strip any excess data (commonly ZIP archives)
+		WARNING: Very beta. Currently strips animated GIFs too :(
+	**/
+	define('REDRAW_IMAGE', true);
+	// Redrawing configuration
+	define('JPEG_QUALITY',	100);
+	
+	
 	define('DIR_IMG',		'src/');
 	define('DIR_THUMB',		'thumb/');
 	define('DIR_RES',		'res/');

inc/functions.php

@@ -309,28 +309,28 @@
 	 return $res;
 	}
 
-	function resize($type, $source_pic, $destination_pic, $max_width, $max_height) {
+	function createimage($type, $source_pic) {
-		$return = Array();
-		
 		switch($type) {
 			case 'jpg':
 			case 'jpeg':
-				$src = imagecreatefromjpeg($source_pic);
+				return imagecreatefromjpeg($source_pic);
 				break;
 			case 'png':
-				$src = imagecreatefrompng($source_pic);
+				return imagecreatefrompng($source_pic);
 				break;
 			case 'gif':
-				$src = imagecreatefromgif($source_pic);
+				return imagecreatefromgif($source_pic);
 				break;
 			case 'bmp':
-				$src = imagecreatefrombmp($source_pic);
+				return imagecreatefrombmp($source_pic);
 				break;
 			default:
 				error('Unknwon file extension.');
 		}
-		
+	}
-		list($width,$height)=getimagesize($source_pic);
+	
+	function resize($src, $width, $height, $destination_pic, $max_width, $max_height) {
+		$return = Array();
 
 		$x_ratio = $max_width / $width;
 		$y_ratio = $max_height / $height;
@@ -362,4 +362,85 @@
 		
 		return $return;
 	}
+	
+	function imagebmp(&$img, $filename=""){ 
+      $widthOrig = imagesx($img); 
+      // width = 16*x 
+      $widthFloor = ((floor($widthOrig/16))*16); 
+      $widthCeil = ((ceil($widthOrig/16))*16); 
+      $height = imagesy($img); 
+   
+      $size = ($widthCeil*$height*3)+54; 
+   
+      // Bitmap File Header 
+      $result = 'BM';     // header (2b) 
+      $result .= int_to_dword($size); // size of file (4b) 
+      $result .= int_to_dword(0); // reserved (4b) 
+      $result .= int_to_dword(54);  // byte location in the file which is first byte of IMAGE (4b) 
+      // Bitmap Info Header 
+      $result .= int_to_dword(40);  // Size of BITMAPINFOHEADER (4b) 
+      $result .= int_to_dword($widthCeil);  // width of bitmap (4b) 
+      $result .= int_to_dword($height); // height of bitmap (4b) 
+      $result .= int_to_word(1);  // biPlanes = 1 (2b) 
+      $result .= int_to_word(24); // biBitCount = {1 (mono) or 4 (16 clr ) or 8 (256 clr) or 24 (16 Mil)} (2b)
+      $result .= int_to_dword(0); // RLE COMPRESSION (4b) 
+      $result .= int_to_dword(0); // width x height (4b) 
+      $result .= int_to_dword(0); // biXPelsPerMeter (4b) 
+      $result .= int_to_dword(0); // biYPelsPerMeter (4b) 
+      $result .= int_to_dword(0); // Number of palettes used (4b) 
+      $result .= int_to_dword(0); // Number of important colour (4b) 
+       
+      // is faster than chr() 
+      $arrChr = array(); 
+      for($i=0; $i<256; $i++){ 
+        $arrChr[$i] = chr($i); 
+      } 
+   
+      // creates image data 
+      $bgfillcolor = array("red"=>0, "green"=>0, "blue"=>0); 
+   
+      // bottom to top - left to right - attention blue green red !!! 
+      $y=$height-1; 
+      for ($y2=0; $y2<$height; $y2++) { 
+        for ($x=0; $x<$widthFloor;  ) { 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+          $rgb = imagecolorsforindex($img, imagecolorat($img, $x++, $y)); 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+        } 
+        for ($x=$widthFloor; $x<$widthCeil; $x++) { 
+          $rgb = ($x<$widthOrig) ? imagecolorsforindex($img, imagecolorat($img, $x, $y)) : $bgfillcolor; 
+          $result .= $arrChr[$rgb["blue"]].$arrChr[$rgb["green"]].$arrChr[$rgb["red"]]; 
+        } 
+        $y--; 
+      } 
+       
+      // see imagegif 
+      if($filename==""){ 
+        echo $result; 
+      } else { 
+        $file = fopen($filename, "wb"); 
+        fwrite($file, $result); 
+        fclose($file); 
+      } 
+    } 
+    // imagebmp helpers 
+    function int_to_dword($n){ 
+      return chr($n & 255).chr(($n >> 8) & 255).chr(($n >> 16) & 255).chr(($n >> 24) & 255); 
+    } 
+    function int_to_word($n){ 
+      return chr($n & 255).chr(($n >> 8) & 255); 
+    } 
 ?>

post.php

@@ -130,8 +130,32 @@
 			$post['filehash'] = md5_file($post['file']);
 			$post['filesize'] = filesize($post['file']);
 			
+			$image = createimage($post['extension'], $post['file']);
+			
+			if(REDRAW_IMAGE) {
+				switch($post['extension']) {
+					case 'jpg':
+					case 'jpeg':
+						imagejpeg($image, $post['file'], JPEG_QUALITY);
+						break;
+					case 'png':
+						imagepng($image, $post['file'], 7);
+						break;
+					case 'gif':
+						imagegif($image, $post['file']);
+						break;
+					case 'bmp':
+						imagebmp($image, $post['file']);
+						break;
+					default:
+						error('Unknwon file extension.');
+				}
+			}
+			
 			// Create a thumbnail
-			$thumb = resize($post['extension'], $post['file'], $post['thumb'], THUMB_WIDTH, THUMB_HEIGHT);		
+			$thumb = resize($image, $post['width'], $post['height'], $post['thumb'], THUMB_WIDTH, THUMB_HEIGHT);
+			
+			
 			$post['thumbwidth'] = $thumb['width'];
 			$post['thumbheight'] = $thumb['height'];
 		}