/* 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 <string.h>

#include <openssl/asn1t.h>

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/obj.h>

#include "../internal.h"

#include "internal.h"

static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

static int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);

static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);

static int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it);

static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);

ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it) {

  ASN1_VALUE *ret = NULL;

  if (ASN1_item_ex_new(&ret, it) > 0) {

    return ret;

  }

  return NULL;

}

// Allocate an ASN1 structure

int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it) {

  const ASN1_TEMPLATE *tt = NULL;

  const ASN1_EXTERN_FUNCS *ef;

  ASN1_VALUE **pseqval;

  int i;

  switch (it->itype) {

    case ASN1_ITYPE_EXTERN:

      ef = it->funcs;

      if (ef && ef->asn1_ex_new) {

        if (!ef->asn1_ex_new(pval, it)) {

          goto memerr;

        }

      }

      break;

    case ASN1_ITYPE_PRIMITIVE:

      if (it->templates) {

        if (!ASN1_template_new(pval, it->templates)) {

          goto memerr;

        }

      } else if (!ASN1_primitive_new(pval, it)) {

        goto memerr;

      }

      break;

    case ASN1_ITYPE_MSTRING:

      if (!ASN1_primitive_new(pval, it)) {

        goto memerr;

      }

      break;

    case ASN1_ITYPE_CHOICE: {

      const ASN1_AUX *aux = it->funcs;

      ASN1_aux_cb *asn1_cb = aux != NULL ? aux->asn1_cb : NULL;

      if (asn1_cb) {

        i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);

        if (!i) {

          goto auxerr;

        }

        if (i == 2) {

          return 1;

        }

      }

      *pval = OPENSSL_malloc(it->size);

      if (!*pval) {

        goto memerr;

      }

      OPENSSL_memset(*pval, 0, it->size);

      asn1_set_choice_selector(pval, -1, it);

      if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL)) {

        goto auxerr2;

      }

      break;

    }

    case ASN1_ITYPE_SEQUENCE: {

      const ASN1_AUX *aux = it->funcs;

      ASN1_aux_cb *asn1_cb = aux != NULL ? aux->asn1_cb : NULL;

      if (asn1_cb) {

        i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);

        if (!i) {

          goto auxerr;

        }

        if (i == 2) {

          return 1;

        }

      }

      *pval = OPENSSL_malloc(it->size);

      if (!*pval) {

        goto memerr;

      }

      OPENSSL_memset(*pval, 0, it->size);

      asn1_refcount_set_one(pval, it);

      asn1_enc_init(pval, it);

      for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {

        pseqval = asn1_get_field_ptr(pval, tt);

        if (!ASN1_template_new(pseqval, tt)) {

          goto memerr2;

        }

      }

      if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL)) {

        goto auxerr2;

      }

      break;

    }

  }

  return 1;

memerr2:

  ASN1_item_ex_free(pval, it);

memerr:

  return 0;

auxerr2:

  ASN1_item_ex_free(pval, it);

auxerr:

  OPENSSL_PUT_ERROR(ASN1, ASN1_R_AUX_ERROR);

  return 0;

}

static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it) {

  const ASN1_EXTERN_FUNCS *ef;

  switch (it->itype) {

    case ASN1_ITYPE_EXTERN:

      ef = it->funcs;

      if (ef && ef->asn1_ex_clear) {

        ef->asn1_ex_clear(pval, it);

      } else {

        *pval = NULL;

      }

      break;

    case ASN1_ITYPE_PRIMITIVE:

      if (it->templates) {

        asn1_template_clear(pval, it->templates);

      } else {

        asn1_primitive_clear(pval, it);

      }

      break;

    case ASN1_ITYPE_MSTRING:

      asn1_primitive_clear(pval, it);

      break;

    case ASN1_ITYPE_CHOICE:

    case ASN1_ITYPE_SEQUENCE:

      *pval = NULL;

      break;

  }

}

static int ASN1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) {

  const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);

  int ret;

  if (tt->flags & ASN1_TFLG_OPTIONAL) {

    asn1_template_clear(pval, tt);

    return 1;

  }

  // If ANY DEFINED BY nothing to do

  if (tt->flags & ASN1_TFLG_ADB_MASK) {

    *pval = NULL;

    return 1;

  }

  // If SET OF or SEQUENCE OF, its a STACK

  if (tt->flags & ASN1_TFLG_SK_MASK) {

    STACK_OF(ASN1_VALUE) *skval;

    skval = sk_ASN1_VALUE_new_null();

    if (!skval) {

      ret = 0;

      goto done;

    }

    *pval = (ASN1_VALUE *)skval;

    ret = 1;

    goto done;

  }

  // Otherwise pass it back to the item routine

  ret = ASN1_item_ex_new(pval, it);

done:

  return ret;

}

static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) {

  // If ADB or STACK just NULL the field

  if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK)) {

    *pval = NULL;

  } else {

    asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));

  }

}

// NB: could probably combine most of the real XXX_new() behaviour and junk

// all the old functions.

static int ASN1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it) {

  if (!it) {

    return 0;

  }

  // Historically, |it->funcs| for primitive types contained an

  // |ASN1_PRIMITIVE_FUNCS| table of calbacks.

  assert(it->funcs == NULL);

  int utype;

  if (it->itype == ASN1_ITYPE_MSTRING) {

    utype = -1;

  } else {

    utype = it->utype;

  }

  switch (utype) {

    case V_ASN1_OBJECT:

      *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);

      return 1;

    case V_ASN1_BOOLEAN:

      *(ASN1_BOOLEAN *)pval = (ASN1_BOOLEAN)it->size;

      return 1;

    case V_ASN1_NULL:

      *pval = (ASN1_VALUE *)1;

      return 1;

    case V_ASN1_ANY: {

      ASN1_TYPE *typ = OPENSSL_malloc(sizeof(ASN1_TYPE));

      if (!typ) {

        return 0;

      }

      typ->value.ptr = NULL;

      typ->type = -1;

      *pval = (ASN1_VALUE *)typ;

      break;

    }

    default:

      *pval = (ASN1_VALUE *)ASN1_STRING_type_new(utype);

      break;

  }

  if (*pval) {

    return 1;

  }

  return 0;

}

static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it) {

  int utype;

  // Historically, |it->funcs| for primitive types contained an

  // |ASN1_PRIMITIVE_FUNCS| table of calbacks.

  assert(it == NULL || it->funcs == NULL);

  if (!it || (it->itype == ASN1_ITYPE_MSTRING)) {

    utype = -1;

  } else {

    utype = it->utype;

  }

  if (utype == V_ASN1_BOOLEAN) {

    *(ASN1_BOOLEAN *)pval = (ASN1_BOOLEAN)it->size;

  } else {

    *pval = NULL;

  }

}