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tasn_utl.c
/* tasn_utl.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */


#include <stddef.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include <openssl/err.h>

/* Utility functions for manipulating fields and offsets */

/* Add 'offset' to 'addr' */
#define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)

/* Given an ASN1_ITEM CHOICE type return
 * the selector value
 */

int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      int *sel = offset2ptr(*pval, it->utype);
      return *sel;
      }

/* Given an ASN1_ITEM CHOICE type set
 * the selector value, return old value.
 */

int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it)
      {     
      int *sel, ret;
      sel = offset2ptr(*pval, it->utype);
      ret = *sel;
      *sel = value;
      return ret;
      }

/* Do reference counting. The value 'op' decides what to do. 
 * if it is +1 then the count is incremented. If op is 0 count is
 * set to 1. If op is -1 count is decremented and the return value
 * is the current refrence count or 0 if no reference count exists.
 */

int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)
      {
      const ASN1_AUX *aux;
      int *lck, ret;
      if ((it->itype != ASN1_ITYPE_SEQUENCE)
         && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))
            return 0;
      aux = it->funcs;
      if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))
            return 0;
      lck = offset2ptr(*pval, aux->ref_offset);
      if (op == 0)
            {
            *lck = 1;
            return 1;
            }
      ret = CRYPTO_add(lck, op, aux->ref_lock);
#ifdef REF_PRINT
      fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);
#endif
#ifdef REF_CHECK
      if (ret < 0) 
            fprintf(stderr, "%s, bad reference count\n", it->sname);
#endif
      return ret;
      }

static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      const ASN1_AUX *aux;
      if (!pval || !*pval)
            return NULL;
      aux = it->funcs;
      if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))
            return NULL;
      return offset2ptr(*pval, aux->enc_offset);
      }

void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      ASN1_ENCODING *enc;
      enc = asn1_get_enc_ptr(pval, it);
      if (enc)
            {
            enc->enc = NULL;
            enc->len = 0;
            enc->modified = 1;
            }
      }

void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
      {
      ASN1_ENCODING *enc;
      enc = asn1_get_enc_ptr(pval, it);
      if (enc)
            {
            if (enc->enc)
                  OPENSSL_free(enc->enc);
            enc->enc = NULL;
            enc->len = 0;
            enc->modified = 1;
            }
      }

int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
                                           const ASN1_ITEM *it)
      {
      ASN1_ENCODING *enc;
      enc = asn1_get_enc_ptr(pval, it);
      if (!enc)
            return 1;

      if (enc->enc)
            OPENSSL_free(enc->enc);
      enc->enc = OPENSSL_malloc(inlen);
      if (!enc->enc)
            return 0;
      memcpy(enc->enc, in, inlen);
      enc->len = inlen;
      enc->modified = 0;

      return 1;
      }
            
int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
                                          const ASN1_ITEM *it)
      {
      ASN1_ENCODING *enc;
      enc = asn1_get_enc_ptr(pval, it);
      if (!enc || enc->modified)
            return 0;
      if (out)
            {
            memcpy(*out, enc->enc, enc->len);
            *out += enc->len;
            }
      if (len)
            *len = enc->len;
      return 1;
      }

/* Given an ASN1_TEMPLATE get a pointer to a field */
ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
      {
      ASN1_VALUE **pvaltmp;
      if (tt->flags & ASN1_TFLG_COMBINE)
            return pval;
      pvaltmp = offset2ptr(*pval, tt->offset);
      /* NOTE for BOOLEAN types the field is just a plain
       * int so we can't return int **, so settle for
       * (int *).
       */
      return pvaltmp;
      }

/* Handle ANY DEFINED BY template, find the selector, look up
 * the relevant ASN1_TEMPLATE in the table and return it.
 */

const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
                                                int nullerr)
      {
      const ASN1_ADB *adb;
      const ASN1_ADB_TABLE *atbl;
      long selector;
      ASN1_VALUE **sfld;
      int i;
      if (!(tt->flags & ASN1_TFLG_ADB_MASK))
            return tt;

      /* Else ANY DEFINED BY ... get the table */
      adb = ASN1_ADB_ptr(tt->item);

      /* Get the selector field */
      sfld = offset2ptr(*pval, adb->offset);

      /* Check if NULL */
      if (!sfld)
            {
            if (!adb->null_tt)
                  goto err;
            return adb->null_tt;
            }

      /* Convert type to a long:
       * NB: don't check for NID_undef here because it
       * might be a legitimate value in the table
       */
      if (tt->flags & ASN1_TFLG_ADB_OID) 
            selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
      else 
            selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);

      /* Try to find matching entry in table
       * Maybe should check application types first to
       * allow application override? Might also be useful
       * to have a flag which indicates table is sorted and
       * we can do a binary search. For now stick to a
       * linear search.
       */

      for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)
            if (atbl->value == selector)
                  return &atbl->tt;

      /* FIXME: need to search application table too */

      /* No match, return default type */
      if (!adb->default_tt)
            goto err;         
      return adb->default_tt;
      
      err:
      /* FIXME: should log the value or OID of unsupported type */
      if (nullerr)
            ASN1err(ASN1_F_ASN1_DO_ADB,
                  ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
      return NULL;
      }

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