code: public long readIntLenenc() {
          int firstByte = readInt1();
          if (firstByte < 0xfb) {
              return firstByte;
          }
          if (0xfb == firstByte) {
              return 0;
          }
          if (0xfc == firstByte) {
              return byteBuf.readShortLE();
          }
          if (0xfd == firstByte) {
              return byteBuf.readMediumLE();
          }
          return byteBuf.readLongLE();
      }
docs: Read lenenc integer from byte buffers.
  
  @see <a href="https://dev.mysql.com/doc/internals/en/integer.html#packet-Protocol::LengthEncodedInteger">LengthEncodedInteger</a>
  
  @return lenenc integer