to{upper,lower}_ascii in Samba 3

[Jelmer Vernooij]

Samba 3 has some nice utility functions for converting ascii characters
to uppercase or lowercase. However, there appear to be two versions:

to{upper,lower}_ascii and to{upper,lower}_ascii_fast

The first pair of functions seems to do conversion to uppercase by
converting to UCS2, changing case and then converting back. The second
pair uses a lookup table.

Is there a good reason for keeping both around rather than using the
second pair everywhere?

(I'd like to move these functions into the common lib/util so Samba 4
can use them)

Cheers,

Jelmer
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