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Niels Lohmann
5bd766aa50
to_bson() rejected a binary value's subtype above 255 (out_of_range.415) in write_bson_binary(), which only has the binary_t, not the basic_json value that holds it, so the exception was created with no JSON_DIAGNOSTICS context even though the equivalent to_msgpack() check names the value's path. The check also ran after the document size, all preceding elements, and this element's header and length had already reached the output adapter, so a caller-provided std::vector or std::string ended up holding a truncated document. calc_bson_sizes() already walks every value before anything is written, to size embedded documents and arrays and to reject invalid keys (out_of_range.409) up front. The subtype check now runs there instead, in calc_bson_binary_size(), which is given the basic_json value so the exception can use it as context. The now-redundant check in write_bson_binary() is removed, since calc_bson_sizes() always throws first if any binary value in the document has an oversized subtype. Fixes #5675. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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