// Copyright 2020 Google Inc.

//

// 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

//

//     http://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 <stddef.h>

#include <stdint.h>

#include <stdlib.h>

#include <string.h>

#include "inchi_api.h"

// Define the maximum value for size_t. We return if the fuzzing input is equal

// to kSizeMax because appending the null-terminator to the InChI buffer would

// cause wraparound, thereby initializing the buffer to size 0.

static const size_t kSizeMax = (size_t)-1;

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

  if (size == kSizeMax)

    return 0;

  char *szINCHISource = malloc(sizeof(char) * (size + 1));

  memcpy(szINCHISource, data, size);

  szINCHISource[size] = '\0'; // InChI string must be null-terminated

  // Buffer lengths taken from InChI API reference, located at

  // https://www.inchi-trust.org/download/104/InChI_API_Reference.pdf, page 24

  char szINCHIKey[28], szXtra1[65], szXtra2[65];

  GetINCHIKeyFromINCHI(szINCHISource, 0, 0, szINCHIKey, szXtra1, szXtra2);

  inchi_InputINCHI inpInChI;

  inpInChI.szInChI = szINCHISource;

  inpInChI.szOptions = NULL;

  inchi_Output out;

  GetINCHIfromINCHI(&inpInChI, &out);

  inchi_OutputStruct outStruct;

  GetStructFromINCHI(&inpInChI, &outStruct);

  free(szINCHISource);

  FreeINCHI(&out);

  FreeStructFromINCHI(&outStruct);

  return 0;

}