unicode support

[yogish]

Unicode support works on window as it provide api for unicode like createfilew.I want to do provide same support in mac.

Need help following issue in mac:

1. API to open a drive ( "/dev/disk...") with unicode path (unsigned short ) and get the handle of it.
2. Using the handle for read/write operation.
3. To get a FSRef of file with unicode (unsigned short) filepath.
4. To display the unmounted drive , the api is CheckForRemovableMedia .
This api is not supported, looking for the replacement call.
5.UTF16 To UTF8 conversion without dataloss
6.UTF16 To Ascii conversion without dataloss.

Thanks.