//

// liblouis Braille Translation and Back-Translation Library

//

// Copyright (C) 2023 Anna Stan, Nicolas Morel, Kalilou Mamadou Dramé

//

// This file is part of liblouis.

//

// liblouis is free software: you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published

// by the Free Software Foundation, either version 2.1 of the License, or

// (at your option) any later version.

//

// liblouis 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

// Lesser General Public License for more details.

//

// You should have received a copy of the GNU Lesser General Public

// License along with liblouis. If not, see <http://www.gnu.org/licenses/>.

//

#include <config.h>

#include <assert.h>

#include <fcntl.h>

#include <internal.h>

#include <liblouis.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#define LANGUAGE "en"

static int initialized = 0;

#define BOLDRED(x) "\x1b[31m\x1b[1m" x "\x1b[0m"

static const char *table_default;

static void __attribute__((destructor)) free_ressources(void) { lou_free(); }

void avoid_log(logLevels level, const char *msg) {

  (void)level;

  (void)msg;

}

extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  int inputLen = 0;

  int outputLen = 0;

  static int counter = 0;

  if (!initialized) {

    lou_registerLogCallback(avoid_log);

    initialized = 1;

  }

  if (size < 512) {

    return 0;

  }

  // Write first half of fuzz data to a table file.

  char new_file[256];

  sprintf(new_file, "/tmp/libfuzzer-%d.ctb", counter);

  counter++;

  FILE *fp = fopen(new_file, "wb");

  if (!fp) {

    return 0;

  }

  fwrite(data, 512, 1, fp);

  fclose(fp);

  // Adjust data pointer to after the table file data.

  data += 512;

  size -= 512;

  /* check if this works, otherwise bail */

  if (lou_checkTable(new_file) == 0) {

    lou_free();

    unlink(new_file);

    return 0;

  }

  char *mutable_data = NULL;

  table_default = new_file;

  mutable_data = strndup((char *)data, size);

  if (!mutable_data) {

    perror("malloc");

    exit(1);

  }

  widechar *inputText = malloc((size * 16 + 1) * sizeof(widechar));

  int len = (int)_lou_extParseChars(mutable_data, inputText);

  free(mutable_data);

  if (len <= 0) {

    free(inputText);

    unlink(new_file);

    lou_free();

    return -1;

  }

  assert(len <= (size * 16));

  inputLen = len;

  outputLen = len * 16;

  widechar *outputText = malloc((outputLen + 1) * sizeof(widechar));

  lou_backTranslateString(table_default, inputText, &inputLen, outputText,

                      &outputLen, NULL, NULL, ucBrl);

  free(inputText);

  free(outputText);

  lou_free();

  unlink(new_file);

  return 0;

}