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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// JsonCpp fuzzing wrapper to help with automated fuzz testing.
#include <stdint.h>
#include <array>
#include <climits>
#include <cstdio>
#include <iostream>
#include <memory>
#include "third_party/jsoncpp/source/include/json/json.h"
namespace {
// JsonCpp has a few different parsing options. The code below makes sure that
// the most intersting variants are tested.
enum { kBuilderConfigDefault = 0, kBuilderConfigStrict, kNumBuilderConfig };
} // namespace
static const std::array<Json::CharReaderBuilder, kNumBuilderConfig>&
Initialize() {
static std::array<Json::CharReaderBuilder, kNumBuilderConfig> builders{};
Json::CharReaderBuilder::strictMode(
&builders[kBuilderConfigStrict].settings_);
return builders;
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
const auto& reader_builders = Initialize();
for (const auto& reader_builder : reader_builders) {
// Parse Json.
auto reader =
std::unique_ptr<Json::CharReader>(reader_builder.newCharReader());
Json::Value root;
bool res = reader->parse(reinterpret_cast<const char*>(data),
reinterpret_cast<const char*>(data + size), &root,
nullptr /* errs */);
if (!res) {
continue;
}
// Write and re-read json.
const Json::StreamWriterBuilder writer_builder;
auto writer =
std::unique_ptr<Json::StreamWriter>(writer_builder.newStreamWriter());
std::stringstream out_stream;
writer->write(root, &out_stream);
std::string output_json = out_stream.str();
Json::Value root_again;
res = reader->parse(output_json.data(),
output_json.data() + output_json.length(), &root_again,
nullptr /* errs */);
if (!res) {
continue;
}
// Run equality test.
// Note: This actually causes the Json::Value tree to be traversed and all
// the values to be dereferenced (until two of them are found not equal),
// which is great for detecting memory corruption bugs when compiled with
// AddressSanitizer. The result of the comparison is ignored, as it is
// expected that both the original and the re-read version will differ from
// time to time (e.g. due to floating point accuracy loss).
(void)(root == root_again);
}
return 0;
}
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