TWRITE_INT
TWRITE_INT(ptr, data->md5.length, 0);
TWRITE_INT(ptr, data->ctx->gss_flags, 0);
TWRITE_INT(ptr, cb->initiator_addrtype, bigend);
TWRITE_INT(ptr, cb->acceptor_addrtype, bigend);
TWRITE_INT((ptr), (buf).length, (bigend)); \