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Add an error_handler parameter to to_msgpack

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The MessagePack spec allows ill-formed UTF-8 in a str, so the default stays
keep (also if JSON_STRICT_BINARY_UTF8 is enabled), but decoders such as
msgpack-python reject it by default. With the parameter, strict catches
such strings and replace/ignore sanitize them, the same way as for the
other binary writers and dump().

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-02 09:02:34 +02:00
parent cf55a6cb3a
commit bbf9b69d38
10 changed files with 115 additions and 62 deletions
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include/nlohmann/json.hpp
+9 -6
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@@ -5473,26 +5473,29 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
/// @brief create a MessagePack serialization of a given JSON value
/// @sa https://json.nlohmann.me/api/basic_json/to_msgpack/
static std::vector<std::uint8_t> to_msgpack(const basic_json& j)
static std::vector<std::uint8_t> to_msgpack(const basic_json& j,
const error_handler_t error_handler = error_handler_t::keep)
{
std::vector<std::uint8_t> result;
result.reserve(detail::binary_reserve_hint(j));
vector_writer(result).write_msgpack(j);
vector_writer(result, error_handler).write_msgpack(j);
return result;
}
/// @brief create a MessagePack serialization of a given JSON value
/// @sa https://json.nlohmann.me/api/basic_json/to_msgpack/
static void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o)
static void to_msgpack(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const error_handler_t error_handler = error_handler_t::keep)
{
binary_writer<std::uint8_t>(o).write_msgpack(j);
binary_writer<std::uint8_t>(o, error_handler).write_msgpack(j);
}
/// @brief create a MessagePack serialization of a given JSON value
/// @sa https://json.nlohmann.me/api/basic_json/to_msgpack/
static void to_msgpack(const basic_json& j, detail::output_adapter<char> o)
static void to_msgpack(const basic_json& j, detail::output_adapter<char> o,
const error_handler_t error_handler = error_handler_t::keep)
{
binary_writer<char>(o).write_msgpack(j);
binary_writer<char>(o, error_handler).write_msgpack(j);
}
/// @brief create a UBJSON serialization of a given JSON value