/* 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);
}
