/* 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_zalloc(it->size);
      if (!*pval) {
        goto memerr;
      }
      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_zalloc(it->size);
      if (!*pval) {
        goto memerr;
      }
      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) {
  switch (it->itype) {
    case ASN1_ITYPE_EXTERN:
      *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_get_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;
  }
}