json/test/src/fuzzer-parse_msgpack.cpp
2017-12-29 18:31:13 +01:00

65 lines
1.7 KiB
C++

/*
__ _____ _____ _____
__| | __| | | | JSON for Modern C++ (fuzz test support)
| | |__ | | | | | | version 3.0.1
|_____|_____|_____|_|___| 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_msgpack(data)
- vec = to_msgpack(j1)
- j2 = from_msgpack(vec)
- assert(j1 == j2)
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 <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_msgpack(vec1);
try
{
// step 2: round trip
std::vector<uint8_t> vec2 = json::to_msgpack(j1);
// parse serialization
json j2 = json::from_msgpack(vec2);
// serializations must match
assert(json::to_msgpack(j2) == vec2);
}
catch (const json::parse_error&)
{
// parsing a MessagePack 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
}
// return 0 - non-zero return values are reserved for future use
return 0;
}