// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <openssl/asn1.h>

#include <openssl/err.h>

#include <openssl/mem.h>

// 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, void *x) {

  unsigned char *b = nullptr;

  const unsigned char *p;

  long i;

  void *ret;

  if (x == nullptr) {

    return nullptr;

  }

  i = ASN1_item_i2d(reinterpret_cast<ASN1_VALUE *>(x), &b, it);

  if (b == nullptr) {

    return nullptr;

  }

  p = b;

  ret = ASN1_item_d2i(nullptr, &p, i, it);

  OPENSSL_free(b);

  return ret;

}