/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com). */

#include <openssl/ex_data.h>

#include <openssl/err.h>
#include <openssl/thread.h>

#include "crypto_error.h"
#include "internal.h"


/* global_impl is the implementation that we use at runtime. */
static const CRYPTO_EX_DATA_IMPL *global_impl = NULL;

/* ex_data_default_impl is a the default implementation, defined in
 * ex_data_impl.c. */
extern const CRYPTO_EX_DATA_IMPL ex_data_default_impl;

/* get_impl returns the current ex_data implementatation. */
static const CRYPTO_EX_DATA_IMPL *get_impl() {
  const CRYPTO_EX_DATA_IMPL *impl;

  CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
  impl = global_impl;
  CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);

  if (impl != NULL) {
    return impl;
  }

  CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
  if (global_impl == NULL) {
    global_impl = &ex_data_default_impl;
  }
  impl = global_impl;
  CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
  return impl;
}

int CRYPTO_get_ex_new_index(int class_value, long argl, void *argp,
                            CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
                            CRYPTO_EX_free *free_func) {
  const CRYPTO_EX_DATA_IMPL *const impl = get_impl();
  return impl->get_new_index(class_value, argl, argp, new_func, dup_func,
                             free_func);
}

int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int index, void *val) {
  int n, i;

  if (ad->sk == NULL) {
    ad->sk = sk_void_new_null();
    if (ad->sk == NULL) {
      OPENSSL_PUT_ERROR(CRYPTO, CRYPTO_set_ex_data, ERR_R_MALLOC_FAILURE);
      return 0;
    }
  }

  n = sk_void_num(ad->sk);

  /* Add NULL values until the stack is long enough. */
  for (i = n; i <= index; i++) {
    if (!sk_void_push(ad->sk, NULL)) {
      OPENSSL_PUT_ERROR(CRYPTO, CRYPTO_set_ex_data, ERR_R_MALLOC_FAILURE);
      return 0;
    }
  }

  sk_void_set(ad->sk, index, val);
  return 1;
}

void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx) {
  if (ad->sk == NULL || idx >= sk_void_num(ad->sk)) {
    return NULL;
  }
  return sk_void_value(ad->sk, idx);
}

int CRYPTO_ex_data_new_class(void) {
  const CRYPTO_EX_DATA_IMPL *const impl = get_impl();
  return impl->new_class();
}

int CRYPTO_new_ex_data(int class_value, void *obj, CRYPTO_EX_DATA *ad) {
  const CRYPTO_EX_DATA_IMPL *const impl = get_impl();
  return impl->new_ex_data(class_value, obj, ad);
}

int CRYPTO_dup_ex_data(int class_value, CRYPTO_EX_DATA *to,
                       const CRYPTO_EX_DATA *from) {
  const CRYPTO_EX_DATA_IMPL *const impl = get_impl();
  return impl->dup_ex_data(class_value, to, from);
}

void CRYPTO_free_ex_data(int class_value, void *obj, CRYPTO_EX_DATA *ad) {
  const CRYPTO_EX_DATA_IMPL *const impl = get_impl();
  impl->free_ex_data(class_value, obj, ad);
}

const CRYPTO_EX_DATA_IMPL *CRYPTO_get_ex_data_implementation(void) {
  return get_impl();
}

int CRYPTO_set_ex_data_implementation(const CRYPTO_EX_DATA_IMPL *impl) {
  int ret = 0;

  CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
  if (global_impl == NULL) {
    ret = 1;
    global_impl = impl;
  }
  CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);

  return ret;
}

void CRYPTO_cleanup_all_ex_data(void) {
  const CRYPTO_EX_DATA_IMPL *const impl = get_impl();
  impl->cleanup();
}