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lib/helpers/extensions/gomuks_buffer.dart

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+import "dart:convert";
+import "dart:ffi";
+import "dart:typed_data";
+
+import "package:ffi/ffi.dart";
+import "package:nexus/src/third_party/gomuks.g.dart";
+
+extension GomuksBufferX on GomuksBuffer {
+  /// Safely converts the Go buffer into a Dart `Uint8List`
+  Uint8List toBytes() {
+    if (base == nullptr || length <= 0) return Uint8List(0);
+    return base.asTypedList(length);
+  }
+
+  /// Decodes the bytes as JSON
+  Map<String, dynamic> toJson() {
+    final bytes = toBytes();
+    if (bytes.isEmpty) return {};
+    return jsonDecode(utf8.decode(bytes));
+  }
+}
+
+extension JsonToGomuksBuffer on Map<String, dynamic> {
+  GomuksBuffer toGomuksBuffer() {
+    final jsonString = json.encode(this);
+    final bytes = utf8.encode(jsonString);
+
+    final dataPtr = calloc<Uint8>(bytes.length);
+    dataPtr.asTypedList(bytes.length).setAll(0, bytes);
+
+    final bufPtr = calloc<GomuksBuffer>();
+    bufPtr.ref.base = dataPtr;
+    bufPtr.ref.length = bytes.length;
+
+    final bufByValue = bufPtr.ref;
+
+    calloc.free(bufPtr);
+
+    return bufByValue;
+  }
+}