/*

 * Copyright 1995-2024 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/asn1t.h>

#ifndef NO_OLD_ASN1

void *ASN1_dup(i2d_of_void *i2d, d2i_of_void *d2i, const void *x)

{

    unsigned char *b, *p;

    const unsigned char *p2;

    int i;

    char *ret;

    if (x == NULL)

        return NULL;

    i = i2d(x, NULL);

    if (i <= 0)

        return NULL;

    b = OPENSSL_malloc(i + 10);

    if (b == NULL)

        return NULL;

    p = b;

    i = i2d(x, &p);

    p2 = b;

    ret = d2i(NULL, &p2, i);

    OPENSSL_free(b);

    return ret;

}

#endif

/*

 * ASN1_ITEM version of dup: this follows the model above except we don't

 * need to allocate the buffer. At some point this could be rewritten to

 * directly dup the underlying structure instead of doing and encode and

 * decode.

 */

void *ASN1_item_dup(const ASN1_ITEM *it, const void *x)

{

    ASN1_aux_cb *asn1_cb = NULL;

    unsigned char *b = NULL;

    const unsigned char *p;

    long i;

    ASN1_VALUE *ret;

    OSSL_LIB_CTX *libctx = NULL;

    const char *propq = NULL;

    if (x == NULL)

        return NULL;

    if (it->itype == ASN1_ITYPE_SEQUENCE || it->itype == ASN1_ITYPE_CHOICE

        || it->itype == ASN1_ITYPE_NDEF_SEQUENCE) {

        const ASN1_AUX *aux = it->funcs;

        asn1_cb = aux != NULL ? aux->asn1_cb : NULL;

    }

    if (asn1_cb != NULL) {

        if (!asn1_cb(ASN1_OP_DUP_PRE, (ASN1_VALUE **)&x, it, NULL)

                || !asn1_cb(ASN1_OP_GET0_LIBCTX, (ASN1_VALUE **)&x, it, &libctx)

                || !asn1_cb(ASN1_OP_GET0_PROPQ, (ASN1_VALUE **)&x, it, &propq))

            goto auxerr;

    }

    i = ASN1_item_i2d(x, &b, it);

    if (i < 0 || b == NULL) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

        return NULL;

    }

    p = b;

    ret = ASN1_item_d2i_ex(NULL, &p, i, it, libctx, propq);

    OPENSSL_free(b);

    if (asn1_cb != NULL

        && !asn1_cb(ASN1_OP_DUP_POST, &ret, it, (void *)x))

        goto auxerr;

    return ret;

 auxerr:

    ERR_raise_data(ERR_LIB_ASN1, ASN1_R_AUX_ERROR, "Type=%s", it->sname);

    return NULL;

}