/*

 * Copyright (C) 2000-2012 Free Software Foundation, Inc.

 *

 * Author: Nikos Mavrogiannopoulos

 *

 * This file is part of GnuTLS.

 *

 * The GnuTLS is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public License

 * as published by the Free Software Foundation; either version 2.1 of

 * the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>

 *

 */

#ifndef GNUTLS_CONSTATE_H

#define GNUTLS_CONSTATE_H

int _gnutls_set_cipher_suite2(gnutls_session_t session,

			     const gnutls_cipher_suite_entry_st *cs);

void _gnutls_epoch_set_null_algos(gnutls_session_t session,

				  record_parameters_st * params);

int _gnutls_epoch_set_keys(gnutls_session_t session, uint16_t epoch);

int _gnutls_connection_state_init(gnutls_session_t session);

int _gnutls_read_connection_state_init(gnutls_session_t session);

int _gnutls_write_connection_state_init(gnutls_session_t session);

#define _gnutls_epoch_bump(session) \

	(session)->security_parameters.epoch_next++

int _gnutls_epoch_get(gnutls_session_t session, unsigned int epoch_rel,

		      record_parameters_st ** params_out);

int _gnutls_epoch_new(gnutls_session_t session, unsigned null_epoch, record_parameters_st **newp);

void _gnutls_epoch_gc(gnutls_session_t session);

void _gnutls_epoch_free(gnutls_session_t session,

			record_parameters_st * state);

static inline int _gnutls_epoch_is_valid(gnutls_session_t session,

					 int epoch)

{

	record_parameters_st *params;

	int ret;

	ret = _gnutls_epoch_get(session, epoch, &params);

	if (ret < 0)

		return 0;

	return 1;

}

static inline int _gnutls_epoch_refcount_inc(gnutls_session_t session,

					     int epoch)

{

	record_parameters_st *params;

	int ret;

	ret = _gnutls_epoch_get(session, epoch, &params);

	if (ret < 0)

		return ret;

	params->usage_cnt++;

	return params->epoch;

}

static inline int _gnutls_epoch_refcount_dec(gnutls_session_t session,

					     uint16_t epoch)

{

	record_parameters_st *params;

	int ret;

	ret = _gnutls_epoch_get(session, epoch, &params);

	if (ret < 0)

		return ret;

	params->usage_cnt--;

	if (params->usage_cnt < 0)

		return GNUTLS_E_INTERNAL_ERROR;

	return 0;

}

#endif