crypto/asn1/a_dup.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1.h>
  13
  14 #ifndef NO_OLD_ASN1
  15
  16 void *ASN1_dup(i2d_of_void *i2d, d2i_of_void *d2i, void *x)
  17 {
  18     unsigned char *b, *p;
  19     const unsigned char *p2;
  20     int i;
  21     char *ret;
  22
  23     if (x == NULL)
  24         return NULL;
  25
  26     i = i2d(x, NULL);
  27     b = OPENSSL_malloc(i + 10);
  28     if (b == NULL) {
  29         ASN1err(ASN1_F_ASN1_DUP, ERR_R_MALLOC_FAILURE);
  30         return NULL;
  31     }
  32     p = b;
  33     i = i2d(x, &p);
  34     p2 = b;
  35     ret = d2i(NULL, &p2, i);
  36     OPENSSL_free(b);
  37     return ret;
  38 }
  39
  40 #endif
  41
  42 /*
  43  * ASN1_ITEM version of dup: this follows the model above except we don't
  44  * need to allocate the buffer. At some point this could be rewritten to
  45  * directly dup the underlying structure instead of doing and encode and
  46  * decode.
  47  */
  48
  49 void *ASN1_item_dup(const ASN1_ITEM *it, void *x)
  50 {
  51     unsigned char *b = NULL;
  52     const unsigned char *p;
  53     long i;
  54     void *ret;
  55
  56     if (x == NULL)
  57         return NULL;
  58
  59     i = ASN1_item_i2d(x, &b, it);
  60     if (b == NULL) {
  61         ASN1err(ASN1_F_ASN1_ITEM_DUP, ERR_R_MALLOC_FAILURE);
  62         return NULL;
  63     }
  64     p = b;
  65     ret = ASN1_item_d2i(NULL, &p, i, it);
  66     OPENSSL_free(b);
  67     return ret;
  68 }