/* 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 <string.h>

#include <openssl/asn1t.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>


static int asn1_item_ex_combine_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
								int combine);
static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
	{
	ASN1_VALUE *ret = NULL;
	if (ASN1_item_ex_new(&ret, it) > 0)
		return ret;
	return NULL;
	}

/* Allocate an ASN1 structure */

int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
	{
	return asn1_item_ex_combine_new(pval, it, 0);
	}

static int asn1_item_ex_combine_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
								int combine)
	{
	const ASN1_TEMPLATE *tt = NULL;
	const ASN1_COMPAT_FUNCS *cf;
	const ASN1_EXTERN_FUNCS *ef;
	const ASN1_AUX *aux = it->funcs;
	ASN1_aux_cb *asn1_cb;
	ASN1_VALUE **pseqval;
	int i;
	if (aux && aux->asn1_cb)
		asn1_cb = aux->asn1_cb;
	else
		asn1_cb = 0;

#ifdef CRYPTO_MDEBUG
	if (it->sname)
		CRYPTO_push_info(it->sname);
#endif

	switch(it->itype)
		{

		case ASN1_ITYPE_EXTERN:
		ef = it->funcs;
		if (ef && ef->asn1_ex_new)
			{
			if (!ef->asn1_ex_new(pval, it))
				goto memerr;
			}
		break;

		case ASN1_ITYPE_COMPAT:
		cf = it->funcs;
		if (cf && cf->asn1_new) {
			*pval = cf->asn1_new();
			if (!*pval)
				goto memerr;
		}
		break;

		case ASN1_ITYPE_PRIMITIVE:
		if (it->templates)
			{
			if (!ASN1_template_new(pval, it->templates))
				goto memerr;
			}
		else if (!ASN1_primitive_new(pval, it))
				goto memerr;
		break;

		case ASN1_ITYPE_MSTRING:
		if (!ASN1_primitive_new(pval, it))
				goto memerr;
		break;

		case ASN1_ITYPE_CHOICE:
		if (asn1_cb)
			{
			i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
			if (!i)
				goto auxerr;
			if (i==2)
				{
#ifdef CRYPTO_MDEBUG
				if (it->sname)
					CRYPTO_pop_info();
#endif
				return 1;
				}
			}
		if (!combine)
			{
			*pval = OPENSSL_malloc(it->size);
			if (!*pval)
				goto memerr;
			memset(*pval, 0, it->size);
			}
		asn1_set_choice_selector(pval, -1, it);
		if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
				goto auxerr;
		break;

		case ASN1_ITYPE_NDEF_SEQUENCE:
		case ASN1_ITYPE_SEQUENCE:
		if (asn1_cb)
			{
			i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
			if (!i)
				goto auxerr;
			if (i==2)
				{
#ifdef CRYPTO_MDEBUG
				if (it->sname)
					CRYPTO_pop_info();
#endif
				return 1;
				}
			}
		if (!combine)
			{
			*pval = OPENSSL_malloc(it->size);
			if (!*pval)
				goto memerr;
			memset(*pval, 0, it->size);
			asn1_refcount_set_one(pval, it);
			asn1_enc_init(pval, it);
			}
		for (i = 0, tt = it->templates; i < it->tcount; tt++, i++)
			{
			pseqval = asn1_get_field_ptr(pval, tt);
			if (!ASN1_template_new(pseqval, tt))
				goto memerr;
			}
		if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
				goto auxerr;
		break;
	}
#ifdef CRYPTO_MDEBUG
	if (it->sname) CRYPTO_pop_info();
#endif
	return 1;

	memerr:
	OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
	ASN1_item_ex_free(pval, it);
#ifdef CRYPTO_MDEBUG
	if (it->sname) CRYPTO_pop_info();
#endif
	return 0;

	auxerr:
	OPENSSL_PUT_ERROR(ASN1, ASN1_R_AUX_ERROR);
	ASN1_item_ex_free(pval, it);
#ifdef CRYPTO_MDEBUG
	if (it->sname) CRYPTO_pop_info();
#endif
	return 0;

	}

static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
	{
	const ASN1_EXTERN_FUNCS *ef;

	switch(it->itype)
		{

		case ASN1_ITYPE_EXTERN:
		ef = it->funcs;
		if (ef && ef->asn1_ex_clear) 
			ef->asn1_ex_clear(pval, it);
		else *pval = NULL;
		break;


		case ASN1_ITYPE_PRIMITIVE:
		if (it->templates) 
			asn1_template_clear(pval, it->templates);
		else
			asn1_primitive_clear(pval, it);
		break;

		case ASN1_ITYPE_MSTRING:
		asn1_primitive_clear(pval, it);
		break;

		case ASN1_ITYPE_COMPAT:
		case ASN1_ITYPE_CHOICE:
		case ASN1_ITYPE_SEQUENCE:
		case ASN1_ITYPE_NDEF_SEQUENCE:
		*pval = NULL;
		break;
		}
	}


int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
	{
	const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
	int ret;
	if (tt->flags & ASN1_TFLG_OPTIONAL)
		{
		asn1_template_clear(pval, tt);
		return 1;
		}
	/* If ANY DEFINED BY nothing to do */

	if (tt->flags & ASN1_TFLG_ADB_MASK)
		{
		*pval = NULL;
		return 1;
		}
#ifdef CRYPTO_MDEBUG
	if (tt->field_name)
		CRYPTO_push_info(tt->field_name);
#endif
	/* If SET OF or SEQUENCE OF, its a STACK */
	if (tt->flags & ASN1_TFLG_SK_MASK)
		{
		STACK_OF(ASN1_VALUE) *skval;
		skval = sk_ASN1_VALUE_new_null();
		if (!skval)
			{
			OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
			ret = 0;
			goto done;
			}
		*pval = (ASN1_VALUE *)skval;
		ret = 1;
		goto done;
		}
	/* Otherwise pass it back to the item routine */
	ret = asn1_item_ex_combine_new(pval, it, tt->flags & ASN1_TFLG_COMBINE);
	done:
#ifdef CRYPTO_MDEBUG
	if (it->sname)
		CRYPTO_pop_info();
#endif
	return ret;
	}

static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
	{
	/* If ADB or STACK just NULL the field */
	if (tt->flags & (ASN1_TFLG_ADB_MASK|ASN1_TFLG_SK_MASK)) 
		*pval = NULL;
	else
		asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
	}


/* NB: could probably combine most of the real XXX_new() behaviour and junk
 * all the old functions.
 */

int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
	{
	ASN1_TYPE *typ;
	ASN1_STRING *str;
	int utype;

	if (!it)
		return 0;

	if (it->funcs)
		{
		const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
		if (pf->prim_new)
			return pf->prim_new(pval, it);
		}

	if (it->itype == ASN1_ITYPE_MSTRING)
		utype = -1;
	else
		utype = it->utype;
	switch(utype)
		{
		case V_ASN1_OBJECT:
		*pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
		return 1;

		case V_ASN1_BOOLEAN:
		*(ASN1_BOOLEAN *)pval = it->size;
		return 1;

		case V_ASN1_NULL:
		*pval = (ASN1_VALUE *)1;
		return 1;

		case V_ASN1_ANY:
		typ = OPENSSL_malloc(sizeof(ASN1_TYPE));
		if (!typ)
			return 0;
		typ->value.ptr = NULL;
		typ->type = -1;
		*pval = (ASN1_VALUE *)typ;
		break;

		default:
		str = ASN1_STRING_type_new(utype);
		if (it->itype == ASN1_ITYPE_MSTRING && str)
			str->flags |= ASN1_STRING_FLAG_MSTRING;
		*pval = (ASN1_VALUE *)str;
		break;
		}
	if (*pval)
		return 1;
	return 0;
	}

static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
	{
	int utype;
	if (it && it->funcs)
		{
		const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
		if (pf->prim_clear)
			pf->prim_clear(pval, it);
		else 
			*pval = NULL;
		return;
		}
	if (!it || (it->itype == ASN1_ITYPE_MSTRING))
		utype = -1;
	else
		utype = it->utype;
	if (utype == V_ASN1_BOOLEAN)
		*(ASN1_BOOLEAN *)pval = it->size;
	else *pval = NULL;
	}