Embedded nulls dropped from JSON strings #559
Description
When parsing JSON strings with embedded null characters, reflect-cpp's JSON parser seems to drop the string from the null onwards. Here's an example extracted from a version of running into this in the wild:
#include <iostream>
#include <string>
#include <optional>
#include <rfl.hpp>
#include <rfl/json.hpp>
struct Response {
std::optional<std::string> result;
};
int main() {
// JSON with a string containing an escaped null byte: "00\u0000"
// This should parse to a 3-character string: '0', '0', '\0'
std::string json = R"({"result": "00\u0000"})";
std::cout << "Input JSON: " << json << "\n";
std::cout << "Expected result length: 3 (two '0' chars + null byte)\n\n";
auto parse_result = rfl::json::read<Response>(json);
if (!parse_result) {
std::cerr << "Parse error: " << parse_result.error().what() << "\n";
return 1;
}
const Response& response = parse_result.value();
if (!response.result) {
std::cerr << "Result is nullopt\n";
return 1;
}
const std::string& value = *response.result;
std::cout << "Parsed string length: " << value.size() << "\n";
std::cout << "Parsed string bytes: ";
for (unsigned char c : value) {
std::cout << static_cast<int>(c) << " ";
}
std::cout << "\n\n";
if (value.size() == 3) {
std::cout << "PASS: String length is correct\n";
return 0;
} else {
std::cout << "FAIL: String was truncated at null byte!\n";
std::cout << " Expected 3 bytes, got " << value.size() << "\n";
return 1;
}
}
When compiled with g++ against reflect-cpp 0.22.0, I get the following output:
Input JSON: {"result": "00\u0000"}
Expected result length: 3 (two '0' chars + null byte)
Parsed string length: 2
Parsed string bytes: 48 48
FAIL: String was truncated at null byte!
Expected 3 bytes, got 2