/* 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 <string.h>

#include <openssl/buf.h>

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/obj.h>

#include <openssl/x509.h>

#include "../internal.h"

#include "internal.h"

// Limit to ensure we don't overflow: much greater than

// anything enountered in practice.

#define NAME_ONELINE_MAX (1024 * 1024)

char *X509_NAME_oneline(const X509_NAME *a, char *buf, int len) {

  X509_NAME_ENTRY *ne;

  size_t i;

  int n, lold, l, l1, l2, num, j, type;

  const char *s;

  char *p;

  unsigned char *q;

  BUF_MEM *b = NULL;

  static const char hex[17] = "0123456789ABCDEF";

  int gs_doit[4];

  char tmp_buf[80];

  if (buf == NULL) {

    if ((b = BUF_MEM_new()) == NULL) {

      goto err;

    }

    if (!BUF_MEM_grow(b, 200)) {

      goto err;

    }

    b->data[0] = '\0';

    len = 200;

  } else if (len <= 0) {

    return NULL;

  }

  if (a == NULL) {

    if (b) {

      buf = b->data;

      OPENSSL_free(b);

    }

    OPENSSL_strlcpy(buf, "NO X509_NAME", len);

    return buf;

  }

  len--;  // space for '\0'

  l = 0;

  for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {

    ne = sk_X509_NAME_ENTRY_value(a->entries, i);

    n = OBJ_obj2nid(ne->object);

    if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {

      i2t_ASN1_OBJECT(tmp_buf, sizeof(tmp_buf), ne->object);

      s = tmp_buf;

    }

    l1 = strlen(s);

    type = ne->value->type;

    num = ne->value->length;

    if (num > NAME_ONELINE_MAX) {

      OPENSSL_PUT_ERROR(X509, X509_R_NAME_TOO_LONG);

      goto err;

    }

    q = ne->value->data;

    if ((type == V_ASN1_GENERALSTRING) && ((num % 4) == 0)) {

      gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 0;

      for (j = 0; j < num; j++) {

        if (q[j] != 0) {

          gs_doit[j & 3] = 1;

        }

      }

      if (gs_doit[0] | gs_doit[1] | gs_doit[2]) {

        gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;

      } else {

        gs_doit[0] = gs_doit[1] = gs_doit[2] = 0;

        gs_doit[3] = 1;

      }

    } else {

      gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;

    }

    for (l2 = j = 0; j < num; j++) {

      if (!gs_doit[j & 3]) {

        continue;

      }

      l2++;

      if ((q[j] < ' ') || (q[j] > '~')) {

        l2 += 3;

      }

    }

    lold = l;

    l += 1 + l1 + 1 + l2;

    if (l > NAME_ONELINE_MAX) {

      OPENSSL_PUT_ERROR(X509, X509_R_NAME_TOO_LONG);

      goto err;

    }

    if (b != NULL) {

      if (!BUF_MEM_grow(b, l + 1)) {

        goto err;

      }

      p = &(b->data[lold]);

    } else if (l > len) {

      break;

    } else {

      p = &(buf[lold]);

    }

    *(p++) = '/';

    OPENSSL_memcpy(p, s, (unsigned int)l1);

    p += l1;

    *(p++) = '=';

    q = ne->value->data;

    for (j = 0; j < num; j++) {

      if (!gs_doit[j & 3]) {

        continue;

      }

      n = q[j];

      if ((n < ' ') || (n > '~')) {

        *(p++) = '\\';

        *(p++) = 'x';

        *(p++) = hex[(n >> 4) & 0x0f];

        *(p++) = hex[n & 0x0f];

      } else {

        *(p++) = n;

      }

    }

    *p = '\0';

  }

  if (b != NULL) {

    p = b->data;

    OPENSSL_free(b);

  } else {

    p = buf;

  }

  if (i == 0) {

    *p = '\0';

  }

  return p;

err:

  BUF_MEM_free(b);

  return NULL;

}