docs: public FilterByteBuffer get(byte[] dst, int offset, int length) throws IOException
      {
          checkIn();
          int len = length;
          int count = 100;
          while (len > 0 && count > 0)
          {
              int rc = in.read(dst, offset+length-len, len);
              if (rc == -1)
              {
                  throw new EOFException();
              }
              len -= rc;
              count--;
          }
          if (count == 0)
          {
              throw new IOException("couldn't fill buffer after 100 tries");
          }
          position += length;
          return this;
      }