public int updateIntField(@NotNull VirtualFile vFile,
                            int fieldOffset,
                            @NotNull IntUnaryOperator updateOperator) throws IOException {
    int fileId = extractFileId(vFile);
    return updateIntField(fileId, fieldOffset, updateOperator);
  }
public int updateIntField(@NotNull VirtualFile vFile,
                            int fieldOffset,
                            @NotNull IntUnaryOperator updateOperator)