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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/json/json_reader.h"
#include <optional>
#include <string_view>
#include "base/containers/heap_array.h"
#include "base/json/json_writer.h"
#include "base/strings/string_view_util.h"
#include "base/values.h"
namespace base {
// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size < 2) {
return 0;
}
// SAFETY: LibFuzzer provides a valid data/size pair.
auto data_span = UNSAFE_BUFFERS(base::span(data, size));
// Create a copy of input buffer, as otherwise we don't catch
// overflow that touches the last byte (which is used in options).
auto input = base::HeapArray<unsigned char>::Uninit(size - 1);
input.copy_from(data_span.first(size - 1u));
std::string_view input_string = base::as_string_view(input);
const int options = data_span.back();
auto json_val =
JSONReader::ReadAndReturnValueWithError(input_string, options);
if (json_val.has_value()) {
// Check that the value can be serialized and deserialized back to an
// equivalent |Value|.
const Value& value = *json_val;
std::string serialized;
CHECK(JSONWriter::Write(value, &serialized));
std::optional<Value> deserialized = JSONReader::Read(
std::string_view(serialized), JSON_PARSE_CHROMIUM_EXTENSIONS);
CHECK(deserialized);
CHECK_EQ(value, deserialized.value());
}
return 0;
}
} // namespace base
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