--- /dev/null
+/*
+ __ _____ _____ _____
+ __| | __| | | | JSON for Modern C++ (fuzz test support)
+| | |__ | | | | | | version 3.10.5
+|_____|_____|_____|_|___| 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 = from_ubjson(data)
+- vec = to_ubjson(j1)
+- j2 = from_ubjson(vec)
+- assert(j1 == j2)
+- vec2 = to_ubjson(j1, use_size = true, use_type = false)
+- j3 = from_ubjson(vec2)
+- assert(j1 == j3)
+- vec3 = to_ubjson(j1, use_size = true, use_type = true)
+- j4 = from_ubjson(vec3)
+- assert(j1 == j4)
+
+The provided function `LLVMFuzzerTestOneInput` can be used in different fuzzer
+drivers.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <iostream>
+#include <sstream>
+#include <nlohmann/json.hpp>
+
+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
+ std::vector<uint8_t> vec1(data, data + size);
+ json j1 = json::from_ubjson(vec1);
+
+ try
+ {
+ // step 2.1: round trip without adding size annotations to container types
+ std::vector<uint8_t> vec2 = json::to_ubjson(j1, false, false);
+
+ // step 2.2: round trip with adding size annotations but without adding type annonations to container types
+ std::vector<uint8_t> vec3 = json::to_ubjson(j1, true, false);
+
+ // step 2.3: round trip with adding size as well as type annotations to container types
+ std::vector<uint8_t> vec4 = json::to_ubjson(j1, true, true);
+
+ // parse serialization
+ json j2 = json::from_ubjson(vec2);
+ json j3 = json::from_ubjson(vec3);
+ json j4 = json::from_ubjson(vec4);
+
+ // serializations must match
+ assert(json::to_ubjson(j2, false, false) == vec2);
+ assert(json::to_ubjson(j3, true, false) == vec3);
+ assert(json::to_ubjson(j4, true, true) == vec4);
+ }
+ catch (const json::parse_error&)
+ {
+ // parsing a UBJSON serialization must not fail
+ assert(false);
+ }
+ }
+ catch (const json::parse_error&)
+ {
+ // parse errors are ok, because input may be random bytes
+ }
+ catch (const json::type_error&)
+ {
+ // type errors can occur during parsing, too
+ }
+ 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;
+}