ref: 009439541d2c6e8af2596f8fb1b4df85861fd212
dir: /third_party/boringssl/src/crypto/asn1/tasn_fre.c/
/* 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 <assert.h>
#include <openssl/asn1t.h>
#include <openssl/mem.h>
#include "internal.h"
// Free up an ASN1 structure
void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) {
ASN1_item_ex_free(&val, it);
}
void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
const ASN1_TEMPLATE *tt = NULL, *seqtt;
const ASN1_EXTERN_FUNCS *ef;
int i;
if (!pval) {
return;
}
if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) {
return;
}
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: {
const ASN1_AUX *aux = it->funcs;
ASN1_aux_cb *asn1_cb = aux != NULL ? aux->asn1_cb : NULL;
if (asn1_cb) {
i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
if (i == 2) {
return;
}
}
i = asn1_get_choice_selector(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, NULL);
}
OPENSSL_free(*pval);
*pval = NULL;
break;
}
case ASN1_ITYPE_EXTERN:
ef = it->funcs;
if (ef && ef->asn1_ex_free) {
ef->asn1_ex_free(pval, it);
}
break;
case ASN1_ITYPE_SEQUENCE: {
if (!asn1_refcount_dec_and_test_zero(pval, it)) {
return;
}
const ASN1_AUX *aux = it->funcs;
ASN1_aux_cb *asn1_cb = aux != NULL ? aux->asn1_cb : NULL;
if (asn1_cb) {
i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
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, NULL);
}
OPENSSL_free(*pval);
*pval = NULL;
break;
}
}
}
void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) {
if (tt->flags & ASN1_TFLG_SK_MASK) {
STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
for (size_t i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
ASN1_VALUE *vtmp = sk_ASN1_VALUE_value(sk, i);
ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
}
sk_ASN1_VALUE_free(sk);
*pval = NULL;
} else {
ASN1_item_ex_free(pval, ASN1_ITEM_ptr(tt->item));
}
}
void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
// Historically, |it->funcs| for primitive types contained an
// |ASN1_PRIMITIVE_FUNCS| table of calbacks.
assert(it->funcs == NULL);
int utype = it->itype == ASN1_ITYPE_MSTRING ? -1 : it->utype;
switch (utype) {
case V_ASN1_OBJECT:
ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
break;
case V_ASN1_BOOLEAN:
if (it) {
*(ASN1_BOOLEAN *)pval = (ASN1_BOOLEAN)it->size;
} else {
*(ASN1_BOOLEAN *)pval = ASN1_BOOLEAN_NONE;
}
return;
case V_ASN1_NULL:
break;
case V_ASN1_ANY:
if (*pval != NULL) {
asn1_type_cleanup((ASN1_TYPE *)*pval);
OPENSSL_free(*pval);
}
break;
default:
ASN1_STRING_free((ASN1_STRING *)*pval);
*pval = NULL;
break;
}
*pval = NULL;
}