Fix out-of-bounds read in UTF-8/UTF-16 decoders - #218
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The decoders read continuation bytes past the buffer end for a truncated multi-byte sequence at the tail, and the conversion loops over-read by one on non-NUL-terminated input. Replace both with ports of HarfBuzz's hb_utf8_t::next() and hb_utf16_xe_t::next(), which are bounds-safe and substitute U+FFFD for ill-formed input.
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The decoders read continuation bytes past the buffer end for a truncated multi-byte sequence at the tail, and the conversion loops over-read by one on non-NUL-terminated input.
Replace both with ports of HarfBuzz's
hb_utf8_t::next()andhb_utf16_xe_t::next(), which are bounds-safe and substitute U+FFFD for ill-formed input.