json/test/src/fuzzer-parse_json.cpp

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/*
__ _____ _____ _____
__| | __| | | | JSON for Modern C++ (fuzz test support)
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| | |__ | | | | | | 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 <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
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);
}
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catch (const json::parse_error&)
{
// parsing a JSON serialization must not fail
assert(false);
}
}
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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;
}