text: /* 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 <CJWTKitBoringSSL_ex_data.h>
  
  #include <assert.h>
  #include <string.h>
  
  #include <CJWTKitBoringSSL_crypto.h>
  #include <CJWTKitBoringSSL_err.h>
  #include <CJWTKitBoringSSL_mem.h>
  #include <CJWTKitBoringSSL_stack.h>
  #include <CJWTKitBoringSSL_thread.h>
  
  #include "internal.h"
  
  
  DEFINE_STACK_OF(CRYPTO_EX_DATA_FUNCS)
  
  struct crypto_ex_data_func_st {
    long argl;   // Arbitary long
    void *argp;  // Arbitary void pointer
    CRYPTO_EX_free *free_func;
  };
  
  int CRYPTO_get_ex_new_index(CRYPTO_EX_DATA_CLASS *ex_data_class, int *out_index,
                              long argl, void *argp, CRYPTO_EX_free *free_func) {
    CRYPTO_EX_DATA_FUNCS *funcs;
    int ret = 0;
  
    funcs = OPENSSL_malloc(sizeof(CRYPTO_EX_DATA_FUNCS));
    if (funcs == NULL) {
      OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE);
      return 0;
    }
  
    funcs->argl = argl;
    funcs->argp = argp;
    funcs->free_func = free_func;
  
    CRYPTO_STATIC_MUTEX_lock_write(&ex_data_class->lock);
  
    if (ex_data_class->meth == NULL) {
      ex_data_class->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null();
    }
  
    if (ex_data_class->meth == NULL ||
        !sk_CRYPTO_EX_DATA_FUNCS_push(ex_data_class->meth, funcs)) {
      OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE);
      OPENSSL_free(funcs);
      goto err;
    }
  
    *out_index = sk_CRYPTO_EX_DATA_FUNCS_num(ex_data_class->meth) - 1 +
                 ex_data_class->num_reserved;
    ret = 1;
  
  err:
    CRYPTO_STATIC_MUTEX_unlock_write(&ex_data_class->lock);
    return ret;
  }
  
  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, 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, 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 < 0 || (size_t)idx >= sk_void_num(ad->sk)) {
      return NULL;
    }
    return sk_void_value(ad->sk, idx);
  }
  
  // get_func_pointers takes a copy of the CRYPTO_EX_DATA_FUNCS pointers, if any,
  // for the given class. If there are some pointers, it sets |*out| to point to
  // a fresh stack of them. Otherwise it sets |*out| to NULL. It returns one on
  // success or zero on error.
  static int get_func_pointers(STACK_OF(CRYPTO_EX_DATA_FUNCS) **out,
                               CRYPTO_EX_DATA_CLASS *ex_data_class) {
    size_t n;
  
    *out = NULL;
  
    // CRYPTO_EX_DATA_FUNCS structures are static once set, so we can take a
    // shallow copy of the list under lock and then use the structures without
    // the lock held.
    CRYPTO_STATIC_MUTEX_lock_read(&ex_data_class->lock);
    n = sk_CRYPTO_EX_DATA_FUNCS_num(ex_data_class->meth);
    if (n > 0) {
      *out = sk_CRYPTO_EX_DATA_FUNCS_dup(ex_data_class->meth);
    }
    CRYPTO_STATIC_MUTEX_unlock_read(&ex_data_class->lock);
  
    if (n > 0 && *out == NULL) {
      OPENSSL_PUT_ERROR(CRYPTO, ERR_R_MALLOC_FAILURE);
      return 0;
    }
  
    return 1;
  }
  
  void CRYPTO_new_ex_data(CRYPTO_EX_DATA *ad) {
    ad->sk = NULL;
  }
  
  void CRYPTO_free_ex_data(CRYPTO_EX_DATA_CLASS *ex_data_class, void *obj,
                           CRYPTO_EX_DATA *ad) {
    if (ad->sk == NULL) {
      // Nothing to do.
      return;
    }
  
    STACK_OF(CRYPTO_EX_DATA_FUNCS) *func_pointers;
    if (!get_func_pointers(&func_pointers, ex_data_class)) {
      // TODO(davidben): This leaks memory on malloc error.
      return;
    }
  
    for (size_t i = 0; i < sk_CRYPTO_EX_DATA_FUNCS_num(func_pointers); i++) {
      CRYPTO_EX_DATA_FUNCS *func_pointer =
          sk_CRYPTO_EX_DATA_FUNCS_value(func_pointers, i);
      if (func_pointer->free_func) {
        void *ptr = CRYPTO_get_ex_data(ad, i + ex_data_class->num_reserved);
        func_pointer->free_func(obj, ptr, ad, i + ex_data_class->num_reserved,
                                func_pointer->argl, func_pointer->argp);
      }
    }
  
    sk_CRYPTO_EX_DATA_FUNCS_free(func_pointers);
  
    sk_void_free(ad->sk);
    ad->sk = NULL;
  }
  
  void CRYPTO_cleanup_all_ex_data(void) {}
  