blob: c587567b3bc3747f2b70afaa4a64dc7e18f030f1 [file] [log] [blame]
// Copyright 2019 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.
// JsonCpp fuzzing wrapper to help with automated fuzz testing.
#include <stdint.h>
#include <climits>
#include <cstdio>
#include <memory>
#include "third_party/jsoncpp/source/include/json/json.h"
// JsonCpp has a few different parsing options. The code below makes sure that
// the most intersting variants are tested.
enum {
kFeatureSetAll = 0,
kFeatureSetDefault = 1,
kFeatureSetStrict = 2,
const int kSizeOfFeatureSet = kFeatureSetLast;
namespace {
struct Common {
Json::Features features[kSizeOfFeatureSet];
} // namespace
static Common* Initialize() {
static Common common;
common.features[kFeatureSetAll].allowComments_ = true;
common.features[kFeatureSetAll].strictRoot_ = false;
common.features[kFeatureSetStrict] = Json::Features::strictMode();
return &common;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
static Common* common = Initialize();
for (int i = 0; i < kSizeOfFeatureSet; ++i) {
// Parse Json.
Json::Reader reader(common->features[i]);
Json::Value root;
bool res = reader.parse(reinterpret_cast<const char*>(data),
reinterpret_cast<const char*>(data + size), root,
if (!res) {
// Write and re-read json.
Json::FastWriter writer;
std::string output_json = writer.write(root);
Json::Value root_again;
res = reader.parse(output_json, root_again, /*collectComments=*/true);
if (!res) {
// 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;