code: function amf3decInteger(buf) { // Invert the integer
      var resp = amf3decUI29(buf);
      if (resp.value > 0x0FFFFFFF) resp.value = (resp.value & 0x0FFFFFFF) - 0x10000000;
      return resp;
  }
docs: AMF3 Decode an integer
  @param buf
  @returns {{len: number, value: number}}