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I updated the patch. (I copy and pasted "int final = 0" from
above code (ex: utf_16_ex_decode), maybe they also should be
changed for consistency?)

And one more thing, I noticed "errors" is ignored now. We
can detect invalid character if we set MB_ERR_INVALID_CHARS
flag when calling MultiByteToWideChar, but we cannot tell
where is the position of invalid character, and MSDN saids
this flag is available Win2000SP4 or later (I don't know
why)
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/intl/unicode_17si.asp
So I didn't make the patch for it.