// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#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 encountered in practice.

#define NAME_ONELINE_MAX (1024 * 1024)

using namespace bssl;

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 = nullptr;

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

  int gs_doit[4];

  char tmp_buf[80];

  const auto *name = a ? FromOpaque(a) : nullptr;

  if (buf == nullptr) {

    if ((b = BUF_MEM_new()) == nullptr) {

      goto err;

    }

    if (!BUF_MEM_grow(b, 200)) {

      goto err;

    }

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

    len = 200;

  } else if (len <= 0) {

    return nullptr;

  }

  if (a == nullptr) {

    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(name->entries); i++) {

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

    n = OBJ_obj2nid(ne->object);

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

      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 != nullptr) {

      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 != nullptr) {

    p = b->data;

    OPENSSL_free(b);

  } else {

    p = buf;

  }

  if (i == 0) {

    *p = '\0';

  }

  return p;

err:

  BUF_MEM_free(b);

  return nullptr;

}