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Since MultiByteToWideChar()/WideCharToMultiByte() is not reversible if the data contains invalid UTF-8 sequences, use binary search to calculate the number of written bytes from the number of written characters. Also fix writing incomplete UTF-8 sequences. Also fix handling of memory allocation failures. (cherry picked from commit 3cf83d91a5baf3600dd60f7aaaf4fb6d73c4b8a9) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>