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Win32: add Unicode conversion functions
Add Unicode conversion functions to convert between Windows native UTF-16LE encoding to UTF-8 and back. To support repositories with legacy-encoded file names, the UTF-8 to UTF-16 conversion function tries to create valid, unique file names even for invalid UTF-8 byte sequences, so that these repositories can be checked out without error. The current implementation leaves invalid UTF-8 bytes in range 0xa0 - 0xff as is (producing printable Unicode chars \u00a0 - \u00ff, equivalent to ISO-8859-1), and converts 0x80 - 0x9f to hex-code (\u0080 - \u009f are control chars). The Windows MultiByteToWideChar API was not used as it either drops invalid UTF-8 sequences (on Win2k/XP; producing non-unique or even empty file names) or converts them to the replacement char \ufffd (Vista/7; causing ERROR_INVALID_NAME in subsequent calls to file system APIs). Signed-off-by: Karsten Blees <blees@dcon.de>
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