/* 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/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>

#include "internal.h"


int ASN1_TYPE_get(const ASN1_TYPE *a) {
  switch (a->type) {
    case V_ASN1_NULL:
    case V_ASN1_BOOLEAN:
      return a->type;
    case V_ASN1_OBJECT:
      return a->value.object != NULL ? a->type : 0;
    default:
      return a->value.asn1_string != NULL ? a->type : 0;
  }
}

const void *asn1_type_value_as_pointer(const ASN1_TYPE *a) {
  switch (a->type) {
    case V_ASN1_NULL:
      return NULL;
    case V_ASN1_BOOLEAN:
      return a->value.boolean ? (void *)0xff : NULL;
    case V_ASN1_OBJECT:
      return a->value.object;
    default:
      return a->value.asn1_string;
  }
}

void asn1_type_set0_string(ASN1_TYPE *a, ASN1_STRING *str) {
  // |ASN1_STRING| types are almost the same as |ASN1_TYPE| types, except that
  // the negative flag is not reflected into |ASN1_TYPE|.
  int type = str->type;
  if (type == V_ASN1_NEG_INTEGER) {
    type = V_ASN1_INTEGER;
  } else if (type == V_ASN1_NEG_ENUMERATED) {
    type = V_ASN1_ENUMERATED;
  }

  // These types are not |ASN1_STRING| types and use a different
  // representation when stored in |ASN1_TYPE|.
  assert(type != V_ASN1_NULL && type != V_ASN1_OBJECT &&
         type != V_ASN1_BOOLEAN);
  ASN1_TYPE_set(a, type, str);
}

void asn1_type_cleanup(ASN1_TYPE *a) {
  switch (a->type) {
    case V_ASN1_NULL:
      a->value.ptr = NULL;
      break;
    case V_ASN1_BOOLEAN:
      a->value.boolean = ASN1_BOOLEAN_NONE;
      break;
    case V_ASN1_OBJECT:
      ASN1_OBJECT_free(a->value.object);
      a->value.object = NULL;
      break;
    default:
      ASN1_STRING_free(a->value.asn1_string);
      a->value.asn1_string = NULL;
      break;
  }
}

void ASN1_TYPE_set(ASN1_TYPE *a, int type, void *value) {
  asn1_type_cleanup(a);
  a->type = type;
  switch (type) {
    case V_ASN1_NULL:
      a->value.ptr = NULL;
      break;
    case V_ASN1_BOOLEAN:
      a->value.boolean = value ? ASN1_BOOLEAN_TRUE : ASN1_BOOLEAN_FALSE;
      break;
    case V_ASN1_OBJECT:
      a->value.object = value;
      break;
    default:
      a->value.asn1_string = value;
      break;
  }
}

int ASN1_TYPE_set1(ASN1_TYPE *a, int type, const void *value) {
  if (!value || (type == V_ASN1_BOOLEAN)) {
    void *p = (void *)value;
    ASN1_TYPE_set(a, type, p);
  } else if (type == V_ASN1_OBJECT) {
    ASN1_OBJECT *odup;
    odup = OBJ_dup(value);
    if (!odup) {
      return 0;
    }
    ASN1_TYPE_set(a, type, odup);
  } else {
    ASN1_STRING *sdup;
    sdup = ASN1_STRING_dup(value);
    if (!sdup) {
      return 0;
    }
    ASN1_TYPE_set(a, type, sdup);
  }
  return 1;
}

// Returns 0 if they are equal, != 0 otherwise.
int ASN1_TYPE_cmp(const ASN1_TYPE *a, const ASN1_TYPE *b) {
  int result = -1;

  if (!a || !b || a->type != b->type) {
    return -1;
  }

  switch (a->type) {
    case V_ASN1_OBJECT:
      result = OBJ_cmp(a->value.object, b->value.object);
      break;
    case V_ASN1_NULL:
      result = 0;  // They do not have content.
      break;
    case V_ASN1_BOOLEAN:
      result = a->value.boolean - b->value.boolean;
      break;
    case V_ASN1_INTEGER:
    case V_ASN1_ENUMERATED:
    case V_ASN1_BIT_STRING:
    case V_ASN1_OCTET_STRING:
    case V_ASN1_SEQUENCE:
    case V_ASN1_SET:
    case V_ASN1_NUMERICSTRING:
    case V_ASN1_PRINTABLESTRING:
    case V_ASN1_T61STRING:
    case V_ASN1_VIDEOTEXSTRING:
    case V_ASN1_IA5STRING:
    case V_ASN1_UTCTIME:
    case V_ASN1_GENERALIZEDTIME:
    case V_ASN1_GRAPHICSTRING:
    case V_ASN1_VISIBLESTRING:
    case V_ASN1_GENERALSTRING:
    case V_ASN1_UNIVERSALSTRING:
    case V_ASN1_BMPSTRING:
    case V_ASN1_UTF8STRING:
    case V_ASN1_OTHER:
    default:
      result = ASN1_STRING_cmp(a->value.asn1_string, b->value.asn1_string);
      break;
  }

  return result;
}