fix: check buffer length before type conversion

Author: matmen

ImageScript.js

@@ -1624,31 +1624,31 @@ class ImageType {
      * @returns {boolean}
      */
     static isPNG(view) {
-        return view.getUint32(0, false) === MAGIC_NUMBERS.PNG;
+        return view.byteLength >= 4 && view.getUint32(0, false) === MAGIC_NUMBERS.PNG;
     }
 
     /**
      * @param {DataView} view
      * @returns {boolean}
      */
     static isJPEG(view) {
-        return (view.getUint32(0, false) >>> 8) === MAGIC_NUMBERS.JPEG;
+        return view.byteLength >= 4 && (view.getUint32(0, false) >>> 8) === MAGIC_NUMBERS.JPEG;
     }
 
     /**
      * @param {DataView} view
      * @returns {boolean}
      */
     static isTIFF(view) {
-        return view.getUint32(0, false) === MAGIC_NUMBERS.TIFF;
+        return view.byteLength >= 4 && view.getUint32(0, false) === MAGIC_NUMBERS.TIFF;
     }
 
     /**
      * @param {DataView} view
      * @returns {boolean}
      */
     static isGIF(view) {
-        return (view.getUint32(0, false) >>> 8) === MAGIC_NUMBERS.GIF;
+        return view.byteLength >= 4 && (view.getUint32(0, false) >>> 8) === MAGIC_NUMBERS.GIF;
     }
 }