/* tasn_fre.c */

/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

 * project 2000.

 */

/* ====================================================================

 * Copyright (c) 2000 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

 *    licensing@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 <stddef.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/objects.h>

static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine);

/* Free up an ASN1 structure */

EXPORT_C void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)

	{

	asn1_item_combine_free(&val, it, 0);

	}

EXPORT_C void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

	{

	asn1_item_combine_free(pval, it, 0);

	}

static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)

	{

	const ASN1_TEMPLATE *tt = NULL, *seqtt;

	const ASN1_EXTERN_FUNCS *ef;

	const ASN1_COMPAT_FUNCS *cf;

	const ASN1_AUX *aux = it->funcs;

	ASN1_aux_cb *asn1_cb;

	int i;

	if (!pval)

		return;

	if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)

		return;

	if (aux && aux->asn1_cb)

		asn1_cb = aux->asn1_cb;

	else

		asn1_cb = 0;

	switch(it->itype)

		{

		case ASN1_ITYPE_PRIMITIVE:

		if (it->templates)

			ASN1_template_free(pval, it->templates);

		else

			ASN1_primitive_free(pval, it);

		break;

		case ASN1_ITYPE_MSTRING:

		ASN1_primitive_free(pval, it);

		break;

		case ASN1_ITYPE_CHOICE:

		if (asn1_cb)

			{

			i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);

			if (i == 2)

				return;

			}

		i = asn1_get_choice_selector(pval, it);

		if (asn1_cb)

			asn1_cb(ASN1_OP_FREE_PRE, pval, it);

		if ((i >= 0) && (i < it->tcount))

			{

			ASN1_VALUE **pchval;

			tt = it->templates + i;

			pchval = asn1_get_field_ptr(pval, tt);

			ASN1_template_free(pchval, tt);

			}

		if (asn1_cb)

			asn1_cb(ASN1_OP_FREE_POST, pval, it);

		if (!combine)

			{

			OPENSSL_free(*pval);

			*pval = NULL;

			}

		break;

		case ASN1_ITYPE_COMPAT:

		cf = it->funcs;

		if (cf && cf->asn1_free)

			cf->asn1_free(*pval);

		break;

		case ASN1_ITYPE_EXTERN:

		ef = it->funcs;

		if (ef && ef->asn1_ex_free)

			ef->asn1_ex_free(pval, it);

		break;

		case ASN1_ITYPE_NDEF_SEQUENCE:

		case ASN1_ITYPE_SEQUENCE:

		if (asn1_do_lock(pval, -1, it) > 0)

			return;

		if (asn1_cb)

			{

			i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);

			if (i == 2)

				return;

			}		

		asn1_enc_free(pval, it);

		/* If we free up as normal we will invalidate any

		 * ANY DEFINED BY field and we wont be able to 

		 * determine the type of the field it defines. So

		 * free up in reverse order.

		 */

		tt = it->templates + it->tcount - 1;

		for (i = 0; i < it->tcount; tt--, i++)

			{

			ASN1_VALUE **pseqval;

			seqtt = asn1_do_adb(pval, tt, 0);

			if (!seqtt)

				continue;

			pseqval = asn1_get_field_ptr(pval, seqtt);

			ASN1_template_free(pseqval, seqtt);

			}

		if (asn1_cb)

			asn1_cb(ASN1_OP_FREE_POST, pval, it);

		if (!combine)

			{

			OPENSSL_free(*pval);

			*pval = NULL;

			}

		break;

		}

	}

EXPORT_C void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)

	{

	int i;

	if (tt->flags & ASN1_TFLG_SK_MASK)

		{

		STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;

		for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)

			{

			ASN1_VALUE *vtmp;

			vtmp = sk_ASN1_VALUE_value(sk, i);

			asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item),

									0);

			}

		sk_ASN1_VALUE_free(sk);

		*pval = NULL;

		}

	else

		asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),

						tt->flags & ASN1_TFLG_COMBINE);

	}

EXPORT_C void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

	{

	int utype;

	if (it)

		{

		const ASN1_PRIMITIVE_FUNCS *pf;

		pf = it->funcs;

		if (pf && pf->prim_free)

			{

			pf->prim_free(pval, it);

			return;

			}

		}

	/* Special case: if 'it' is NULL free contents of ASN1_TYPE */

	if (!it)

		{

		ASN1_TYPE *typ = (ASN1_TYPE *)*pval;

		utype = typ->type;

		pval = (ASN1_VALUE **)&typ->value.ptr;

		if (!*pval)

			return;

		}

	else if (it->itype == ASN1_ITYPE_MSTRING)

		{

		utype = -1;

		if (!*pval)

			return;

		}

	else

		{

		utype = it->utype;

		if ((utype != V_ASN1_BOOLEAN) && !*pval)

			return;

		}

	switch(utype)

		{

		case V_ASN1_OBJECT:

		ASN1_OBJECT_free((ASN1_OBJECT *)*pval);

		break;

		case V_ASN1_BOOLEAN:

		if (it)

			*(ASN1_BOOLEAN *)pval = it->size;

		else

			*(ASN1_BOOLEAN *)pval = -1;

		return;

		case V_ASN1_NULL:

		break;

		case V_ASN1_ANY:

		ASN1_primitive_free(pval, NULL);

		OPENSSL_free(*pval);

		break;

		default:

		ASN1_STRING_free((ASN1_STRING *)*pval);

		*pval = NULL;

		break;

		}

	*pval = NULL;

	}