/*

 * Copyright(c) 2017 Tim Ruehsen

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <config.h>

#include <assert.h>   /* assert */

#include <stdint.h>   /* uint8_t, uint32_t */

#include <stdlib.h>   /* malloc, free */

#include <string.h>   /* memcpy */

#include "idn2.h"

#include "fuzzer.h"

#pragma GCC optimize ("O0")

int

LLVMFuzzerTestOneInput (const uint8_t *data, size_t size)

{

  char *domain;

  char *out;

  const char *x = "";

  if (size > 1024)

    return 0;

  domain = (char *) malloc (size + 1);

  assert (domain != NULL);

  // 0 terminate

  memcpy (domain, data, size);

  domain[size] = 0;

  if (size == 0)

    {

      x = idn2_check_version (NULL);

      for (int err = -500; err <= 0; err++)

  {

    if (idn2_strerror_name (err))

      x = NULL;

    if (idn2_strerror (err))

      x = NULL;

  }

    /*** test NULL input/output combinations ***/

      if (idn2_to_unicode_lzlz (NULL, &out, 0) == IDN2_OK)

  idn2_free (out);

      idn2_to_unicode_lzlz (NULL, NULL, 0);

      idn2_to_unicode_lzlz (domain, NULL, 0);

      {

  uint32_t *in32 = (uint32_t *) malloc (4);

  uint32_t *out32;

  in32[0] = 0;

  if (idn2_to_unicode_4z4z (NULL, &out32, 0) == IDN2_OK)

    idn2_free (out32);

  idn2_to_unicode_4z4z (NULL, NULL, 0);

  idn2_to_unicode_4z4z (in32, NULL, 0);

  free (in32);

      }

      {

  uint32_t *out32;

  if (idn2_to_unicode_8z4z (NULL, &out32, 0) == IDN2_OK)

    idn2_free (out32);

  idn2_to_unicode_8z4z (NULL, NULL, 0);

  idn2_to_unicode_8z4z (domain, NULL, 0);

      }

      {

  uint32_t *u32 = (uint32_t *) malloc (0);

  size_t u32len = 0;

  idn2_to_unicode_44i (NULL, 1, u32, &u32len, 0);

  u32len = 0;

  idn2_to_unicode_44i (NULL, 0, NULL, &u32len, 0);

  free (u32);

      }

    }

  // let's fuzz gnulib's strverscmp()

  if (idn2_check_version (domain))

    x = NULL;

  if (x)

    free (malloc (1));   // prevent compiler from optimizing out idn2_check_version()

  // internally calls idn2_to_unicode_8zlz(), idn2_to_unicode_8z8z(), idn2_to_unicode_8z4z()

  if (idn2_to_unicode_lzlz (domain, &out, 0) == IDN2_OK)

    idn2_free (out);

  if ((size & 3) == 0)

    {

      uint32_t *u32 = (uint32_t *) malloc (size);

      size_t u32len;

      assert (u32 != NULL);

      // internally calls idn2_to_unicode_4z4z(), idn2_to_unicode_8z4z()

      u32len = size / 4;

      idn2_to_unicode_44i ((uint32_t *) data, size / 4, u32, &u32len, 0);

      free (u32);

    }

  free (domain);

  return 0;

}