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/*
 * 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_EXTENSIONS_H
#define GNUTLS_EXTENSIONS_H

#include <gnutls_str.h>

typedef int (*gnutls_ext_recv_func) (gnutls_session_t session,
                                       const unsigned char *data, size_t len);
typedef int (*gnutls_ext_send_func) (gnutls_session_t session,
                                       gnutls_buffer_st *extdata);

int _gnutls_parse_extensions (gnutls_session_t session,
                              gnutls_ext_parse_type_t parse_type,
                              const uint8_t * data, int data_size);
int _gnutls_gen_extensions (gnutls_session_t session, gnutls_buffer_st * extdata,
                            gnutls_ext_parse_type_t);
int _gnutls_ext_init (void);
void _gnutls_ext_deinit (void);

void _gnutls_extension_list_add (gnutls_session_t session, uint16_t type);

typedef void (*gnutls_ext_deinit_data_func) (extension_priv_data_t data);
typedef int (*gnutls_ext_pack_func) (extension_priv_data_t data,
                                     gnutls_buffer_st * packed_data);
typedef int (*gnutls_ext_unpack_func) (gnutls_buffer_st * packed_data,
                                       extension_priv_data_t * data);
typedef int (*gnutls_ext_handshake_func) (gnutls_session_t session);

void _gnutls_ext_free_session_data (gnutls_session_t session);

/* functions to be used by extensions internally
 */
void _gnutls_ext_unset_session_data (gnutls_session_t session, uint16_t type);
void _gnutls_ext_set_session_data (gnutls_session_t session, uint16_t type,
                                   extension_priv_data_t);
int _gnutls_ext_get_session_data (gnutls_session_t session,
                                  uint16_t type, extension_priv_data_t *);
int _gnutls_ext_get_resumed_session_data (gnutls_session_t session,
                                          uint16_t type,
                                          extension_priv_data_t * data);

void _gnutls_ext_restore_resumed_session (gnutls_session_t session);
int _gnutls_ext_after_handshake (gnutls_session_t session);

/* for session packing */
int _gnutls_ext_pack (gnutls_session_t session, gnutls_buffer_st * packed);
int _gnutls_ext_unpack (gnutls_session_t session, gnutls_buffer_st * packed);

typedef struct
{
  const char *name;
  uint16_t type;
  gnutls_ext_parse_type_t parse_type;

  /* this function must return 0 when Not Applicable
   * size of extension data if ok
   * < 0 on other error.
   */
  gnutls_ext_recv_func recv_func;

  /* this function must return 0 when Not Applicable
   * size of extension data if ok
   * GNUTLS_E_INT_RET_0 if extension data size is zero
   * < 0 on other error.
   */
  gnutls_ext_send_func send_func;

  gnutls_ext_deinit_data_func deinit_func;      /* this will be called to deinitialize
                                                 * internal data 
                                                 */
  gnutls_ext_pack_func pack_func;       /* packs internal data to machine independent format */
  gnutls_ext_unpack_func unpack_func;   /* unpacks internal data */
  gnutls_ext_handshake_func handshake_func; /* called after the handshake is finished */
} extension_entry_st;

int _gnutls_ext_register (extension_entry_st *);

#endif