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.] */
  
  #include <openssl/asn1.h>
  #include <openssl/asn1t.h>
  #include <openssl/x509.h>
  #include <openssl/obj.h>
  
  /*
   * X509_ATTRIBUTE: this has the following form: typedef struct
   * x509_attributes_st { ASN1_OBJECT *object; int single; union { char *ptr;
   * STACK_OF(ASN1_TYPE) *set; ASN1_TYPE *single; } value; } X509_ATTRIBUTE;
   * this needs some extra thought because the CHOICE type is merged with the
   * main structure and because the value can be anything at all we *must* try
   * the SET OF first because the ASN1_ANY type will swallow anything including
   * the whole SET OF structure.
   */
  
  ASN1_CHOICE(X509_ATTRIBUTE_SET) = {
          ASN1_SET_OF(X509_ATTRIBUTE, value.set, ASN1_ANY),
          ASN1_SIMPLE(X509_ATTRIBUTE, value.single, ASN1_ANY)
  } ASN1_CHOICE_END_selector(X509_ATTRIBUTE, X509_ATTRIBUTE_SET, single)
  
  ASN1_SEQUENCE(X509_ATTRIBUTE) = {
          ASN1_SIMPLE(X509_ATTRIBUTE, object, ASN1_OBJECT),
          /* CHOICE type merged with parent */
          ASN1_EX_COMBINE(0, 0, X509_ATTRIBUTE_SET)
  } ASN1_SEQUENCE_END(X509_ATTRIBUTE)
  
  IMPLEMENT_ASN1_FUNCTIONS(X509_ATTRIBUTE)
  IMPLEMENT_ASN1_DUP_FUNCTION(X509_ATTRIBUTE)
  
  X509_ATTRIBUTE *X509_ATTRIBUTE_create(int nid, int atrtype, void *value)
  {
      X509_ATTRIBUTE *ret = NULL;
      ASN1_TYPE *val = NULL;
  
      if ((ret = X509_ATTRIBUTE_new()) == NULL)
          return (NULL);
      /* TODO(fork): const correctness. */
      ret->object = (ASN1_OBJECT *)OBJ_nid2obj(nid);
      ret->single = 0;
      if ((ret->value.set = sk_ASN1_TYPE_new_null()) == NULL)
          goto err;
      if ((val = ASN1_TYPE_new()) == NULL)
          goto err;
      if (!sk_ASN1_TYPE_push(ret->value.set, val))
          goto err;
  
      ASN1_TYPE_set(val, atrtype, value);
      return (ret);
   err:
      if (ret != NULL)
          X509_ATTRIBUTE_free(ret);
      if (val != NULL)
          ASN1_TYPE_free(val);
      return (NULL);
  }
  