Added nullrhi option

lib/test.dart

@@ -0,0 +1,73 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:hex/hex.dart';
+
+const String _original = "2d0069006e007600690074006500730065007300730069006f006e0020002d0069006e007600690074006500660072006f006d0020002d00700061007200740079005f006a006f0069006e0069006e0066006f005f0074006f006b0065006e0020002d007200650070006c0061007900";
+const String _patched = "2d006c006f00670020002d006e006f00730070006c0061007300680020002d006e006f0073006f0075006e00640020002d006e0075006c006c0072006800690020002d007500730065006f006c0064006900740065006d00630061007200640073002000200020002000200020002000";
+final Uint8List _originalBinary = 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 _patchedBinary = 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<String> patchExeHex(File file) async {
+  Future<String> replaceBinary(File file, String original, String replacement) async {
+    var read = await file.readAsBytes();
+    var hex = HEX.encode(read);
+    var fixed =  hex.replaceAll(original, replacement);
+    return fixed;
+  }
+
+  return await replaceBinary(file, _original, _patched);
+}
+
+Future<String> patchExeBinary(File file) async {
+  Future<String> replaceBinary(File file, Uint8List original, Uint8List replacement) async {
+    if(original.length != replacement.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 < replacement.length; index++){
+          read[offset - counter + index] = replacement[index];
+        }
+
+        return HEX.encode(read);
+      }
+    }
+
+    throw Exception("No match");
+  }
+
+  return await replaceBinary(file, _originalBinary, _patchedBinary);
+}
+
+void main() async {
+  var file = File("D:\\Fortnite73\\FortniteGame\\Binaries\\Win64\\FortniteClient-Win64-Shipping.exe");
+  var hexed = await patchExeHex(file);
+  var binary = await patchExeBinary(file);
+  var offset = 0;
+  while(offset < hexed.length){
+    if(hexed[offset] != binary[offset]){
+      print("Difference ${hexed[offset]} != ${binary[offset]} at $offset");
+    }
+
+    offset++;
+  }
+  print(hexed == binary);
+}