Update ParseFile.js

Fixed bug when base64 string is too long

RangeError: Maximum call stack size exceeded
    at RegExp.exec (native)
    at new e (http://localhost:2052/scripts/parse-1.6.14.min.js:13:25178)

Author: Ben

src/ParseFile.js

@@ -99,12 +99,20 @@ export default class ParseFile {
         type: specifiedType
       };
     } else if (data && data.hasOwnProperty('base64')) {
-      var matches = dataUriRegexp.exec(data.base64);
-      if (matches && matches.length > 0) {
+  		var commaIndex = data.base64.indexOf(',');
+  		try {
+  		    window.atob(commaIndex === -1?data.base64:data.base64.slice(commaIndex + 1));
+  		    return true;
+  		} catch(e) {
+  		    throw new TypeError('Cannot create a Parse.File with that data.');
+  		}
+  
+      if (commaIndex !== -1) {
+        var matches = dataUriRegexp.slice(100).exec(data.base64);
         // if data URI with type and charset, there will be 4 matches.
         this._source = {
           format: 'base64',
-          base64: matches.length === 4 ? matches[3] : matches[2],
+          base64: data.base64.slice(commaIndex + 1),
           type: matches[1]
         };
       } else {