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Niels Lohmann
fff221c58b
Adds error_handler_t::keep (invalid UTF-8 sequences are left unchanged) as a fourth error_handler_t value, and threads an error_handler parameter through the binary writers and readers: - to_cbor/to_ubjson/to_bjdata/to_bson gain a trailing error_handler parameter (default strict, matching their existing type_error.316 behavior); keep writes a string value or object key's bytes as is instead of throwing, and replace/ignore sanitize it exactly like dump() would, including for the BSON length prefix. to_msgpack and to_bon8 are unchanged. - from_cbor/from_msgpack/from_ubjson/from_bjdata/from_bson gain a trailing error_handler parameter (default keep, i.e. the lenient behavior every binary reader had in 3.12.0 and still has after #5741); strict checks every string value and object key and raises parse_error.113 for ill-formed UTF-8, honoring allow_exceptions; replace/ignore sanitize it like dump() would. from_bon8 is unchanged, since UTF-8 lead bytes are structural there. dump()'s own keep support writes ill-formed bytes as is, even with ensure_ascii, while still \u-escaping well-formed characters around them as usual. The UTF-8 validity check (is_valid_utf8) and the replace/ignore sanitizing logic (sanitize_utf8) now live in string_utils.hpp, shared by the serializer and the binary reader/writer; error_handler_t itself moved to its own header (detail/output/error_handler.hpp) so that string_utils.hpp does not need to depend on serializer.hpp. See #5529 and #5741. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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