/*
 * 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;
}