/* __ _____ _____ _____ __| | __| | | | JSON for Modern C++ (fuzz test support) | | |__ | | | | | | version 3.7.0 |_____|_____|_____|_|___| https://github.com/nlohmann/json This file implements a parser test suitable for fuzz testing. Given a byte array data, it performs the following steps: - j1 = parse(data) - s1 = serialize(j1) - j2 = parse(s1) - s2 = serialize(j2) - assert(s1 == s2) The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer drivers. Licensed under the MIT License . */ #include #include #include using json = nlohmann::json; // see http://llvm.org/docs/LibFuzzer.html extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { try { // step 1: parse input json j1 = json::parse(data, data + size); try { // step 2: round trip // first serialization std::string s1 = j1.dump(); // parse serialization json j2 = json::parse(s1); // second serialization std::string s2 = j2.dump(); // serializations must match assert(s1 == s2); } catch (const json::parse_error&) { // parsing a JSON serialization must not fail assert(false); } } catch (const json::parse_error&) { // parse errors are ok, because input may be random bytes } catch (const json::out_of_range&) { // out of range errors may happen if provided sizes are excessive } // return 0 - non-zero return values are reserved for future use return 0; }