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Niels Lohmann
95412a36d0
The BSON reader compared a document's declared size with the number of bytes read only when it reached the terminator. The declared size never bounded the reads, so a SAX handler saw the keys and values of a document whose size was too small before parse error 112 was reported. The container frame now stores the position where the document ends according to its declared size. open_bson_document rejects a size below 5 (size prefix plus terminator) and an embedded document that does not end before the terminator of its enclosing document; the element loop rejects an element whose type byte leaves no room for the name terminator and the document terminator. The terminator check stays and still catches a declared size that is too large. No input that was accepted before is rejected now; documents with a wrong size are reported earlier, with fewer SAX events, a different byte position and, in three cases, a different message. The error id (parse_error.112) is unchanged and strict=false still does not skip the check. The tests that asserted the old messages and positions are updated, with the outer sizes of two inputs corrected so that they still exercise the embedded document. New tests cover the SAX events, a size below 5, and an embedded document that fits exactly. Signed-off-by: Niels Lohmann <mail@nlohmann.me>