components/cbor/reader_fuzzer.cc

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/cbor/reader.h"  // nogncheck

#include <stdint.h>

#include <algorithm>

#include "base/compiler_specific.h"
#include "components/cbor/writer.h"  // nogncheck

namespace cbor {

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  std::vector<uint8_t> input(data, UNSAFE_TODO(data + size));

  std::optional<Value> cbor = Reader::Read(input);
  if (cbor.has_value()) {
    std::optional<std::vector<uint8_t>> serialized_cbor =
        Writer::Write(cbor.value());
    CHECK(serialized_cbor.has_value());
    if (serialized_cbor.has_value()) {
      CHECK(serialized_cbor.value().size() == input.size());
      UNSAFE_TODO(CHECK(memcmp(serialized_cbor.value().data(), input.data(),
                               input.size()) == 0));
    }
  }

  Reader::Config config;
  config.allow_and_canonicalize_out_of_order_keys = true;
  std::optional<Value> cbor_1 = Reader::Read(input, config);

  if (cbor_1.has_value()) {
    std::optional<std::vector<uint8_t>> serialized_cbor =
        Writer::Write(cbor_1.value());
    CHECK(serialized_cbor.has_value());
    if (serialized_cbor.has_value()) {
      CHECK(serialized_cbor.value().size() == input.size());
    }
  }

  return 0;
}

}  // namespace cbor