// Copyright 2015 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#include <stddef.h>

#include <stdint.h>

#include <clocale>

#include <string>

#include "flatbuffers/idl.h"

#include "test_init.h"

static constexpr size_t kMinInputLength = 1;

static constexpr size_t kMaxInputLength = 16384;

static constexpr uint8_t flags_strict_json = 0x80;

static constexpr uint8_t flags_skip_unexpected_fields_in_json = 0x40;

static constexpr uint8_t flags_allow_non_utf8 = 0x20;

// Utility for test run.

OneTimeTestInit OneTimeTestInit::one_time_init_;

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

  // Reserve one byte for Parser flags and one byte for repetition counter.

  if (size < 3) return 0;

  const uint8_t flags = data[0];

  (void)data[1];  //  reserved

  data += 2;

  size -= 2;  // bypass

  const std::string original(reinterpret_cast<const char*>(data), size);

  auto input = std::string(original.c_str());  // until '\0'

  if (input.size() < kMinInputLength || input.size() > kMaxInputLength)

    return 0;

  flatbuffers::IDLOptions opts;

  opts.strict_json = (flags & flags_strict_json);

  opts.skip_unexpected_fields_in_json =

      (flags & flags_skip_unexpected_fields_in_json);

  opts.allow_non_utf8 = (flags & flags_allow_non_utf8);

  flatbuffers::Parser parser(opts);

  // Guarantee 0-termination in the input.

  auto parse_input = input.c_str();

  // Check Parser.

  parser.Parse(parse_input);

  // TODO:

  // Need to add additional checks for inputs passed Parse(parse_input)

  // successfully:

  // 1. Serialization to bfbs.

  // 2. Generation of a default object.

  // 3. Verification of the object using reflection.

  // 3. Printing to json.

  return 0;

}