docs: public static int writeTo(final OutputStream out, LinkedBuffer node) throws IOException
      {
          int contentSize = 0, len;
          do
          {
              if ((len = node.offset - node.start) > 0)
              {
                  out.write(node.buffer, node.start, len);
                  contentSize += len;
              }
          } while ((node = node.next) != null);
  
          return contentSize;
      }