Added nullrhi option

lib/src/util/patcher.dart

@@ -0,0 +1,40 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+final Uint8List _original = Uint8List.fromList([
+  45, 0, 105, 0, 110, 0, 118, 0, 105, 0, 116, 0, 101, 0, 115, 0, 101, 0, 115, 0, 115, 0, 105, 0, 111, 0, 110, 0, 32, 0, 45, 0, 105, 0, 110, 0, 118, 0, 105, 0, 116, 0, 101, 0, 102, 0, 114, 0, 111, 0, 109, 0, 32, 0, 45, 0, 112, 0, 97, 0, 114, 0, 116, 0, 121, 0, 95, 0, 106, 0, 111, 0, 105, 0, 110, 0, 105, 0, 110, 0, 102, 0, 111, 0, 95, 0, 116, 0, 111, 0, 107, 0, 101, 0, 110, 0, 32, 0, 45, 0, 114, 0, 101, 0, 112, 0, 108, 0, 97, 0, 121, 0
+]);
+
+final Uint8List _patched = Uint8List.fromList([
+  45, 0, 108, 0, 111, 0, 103, 0, 32, 0, 45, 0, 110, 0, 111, 0, 115, 0, 112, 0, 108, 0, 97, 0, 115, 0, 104, 0, 32, 0, 45, 0, 110, 0, 111, 0, 115, 0, 111, 0, 117, 0, 110, 0, 100, 0, 32, 0, 45, 0, 110, 0, 117, 0, 108, 0, 108, 0, 114, 0, 104, 0, 105, 0, 32, 0, 45, 0, 117, 0, 115, 0, 101, 0, 111, 0, 108, 0, 100, 0, 105, 0, 116, 0, 101, 0, 109, 0, 99, 0, 97, 0, 114, 0, 100, 0, 115, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0, 32, 0
+]);
+
+Future<bool> patchExe(File file) async {
+  if(_original.length != _patched.length){
+    throw Exception("Cannot mutate length of binary file");
+  }
+
+  var read = await file.readAsBytes();
+  var length = await file.length();
+  var offset = 0;
+  var counter = 0;
+  while(offset < length){
+    if(read[offset] == _original[counter]){
+      counter++;
+    }else {
+      counter = 0;
+    }
+
+    offset++;
+    if(counter == _original.length){
+      for(var index = 0; index < _patched.length; index++){
+        read[offset - counter + index] = _patched[index];
+      }
+
+      await file.writeAsBytes(read, mode: FileMode.write);
+      return true;
+    }
+  }
+
+  return false;
+}