// Copyright 2020 Google LLC

//

// 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 "common.h"

#include <fuzzer/FuzzedDataProvider.h>

#ifndef HASHTYPE

#error Macro HASHTYPE must be defined.

#endif

#ifndef FNAME

#error Macro FNAME must be defined.

#endif

#define CONCAT_TYPE(x) _PASTE2(HASHTYPE, x)

#define init CONCAT_TYPE(_init)

#define update CONCAT_TYPE(_update)

#define digest CONCAT_TYPE(_digest)

#define destroy CONCAT_TYPE(_destroy)

#define STR(x) #x

#define INCLUDE(x) STR(x)

#include INCLUDE(FNAME)

#ifndef DIGEST_SIZE

#error Macro DIGEST_SIZE must be defined.

#endif

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

  if (!size)

    return 0;

  FuzzedDataProvider stream(data, size);

  hash_state *hs;

  if (init(&hs))

    return 0;

  while (stream.remaining_bytes()) {

    size_t num_bytes = stream.ConsumeIntegral<size_t>();

    std::vector<uint8_t> buffer = stream.ConsumeBytes<uint8_t>(num_bytes);

    if (update(hs, buffer.data(), buffer.size()))

      goto error;

  }

  uint8_t result[DIGEST_SIZE];

#ifndef DIGEST_THIRD_PARAM

  digest(hs, result);

#else

  digest(hs, result, DIGEST_SIZE);

#endif

error:

  destroy(hs);

  return 0;

}