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97b7fc893c
Some text encodings supported by mbstring (such as UCS-4) accept 4-byte characters. When mbstring encounters an illegal byte sequence for the encoding it is using, it should emit an 'illegal character' marker, which can either be a single character like '?', an HTML hexadecimal entity, or a marker string like 'BAD+XXXX'. Because of the use of signed integers to hold 4-byte characters, illegal 4-byte sequences with a 'negative' value (one with the high bit set) were not handled correctly when emitting the illegal char marker. The result is that such illegal sequences were just skipped over (and the marker was not emitted to the output). Fix that.