Why is File.exists() failing? The raw file object shows the split
UTF-16 values for the second character in the filename (\ud85b,
\udff6).
Seems like a bug to me. Exactly what kind of bug depends on which
native API File.exists() is actually using. Still, since the names
came from File itself, as a listing, the names should work as inputs
to File.
This makes me think I need to do some kind of conversion on the
filename so it gets turned into properly decomposed UTF-8, ...
I don't know why you think that. A String contains UTF-16 chars, not
UTF-8. Depending on the native API used in File.exists(), it may or
may not even use UTF8.
If File.exists() does use UTF8, it almost certainly uses one of the
String-related JNI functions that returns a String as a UTF8 C-
string. So your doing an encode/decode cycle in Java really isn't
accomplishing anything. All it proves is that a round-trip works,
and you don't need File.exists() for that.
Another possibility is the native API uses UTF-16, e.g. one of the
FSRef functions. If so, then UTF8 is never used at all, so encode/
decode cycles are even less relevant.
It's conceivable the JNI function to get UTF8 isn't working right
with the surrogate pair. E.g. it could be encoding to CESU-8, not
real UTF-8. To test any of this you'll have to dip into JNI,
though. Fiddling around at the Java level is at least one step
removed from what's really happening.
I'd write a JNI function that takes a String pathname and calls the
lstat(2) function, passing it the UTF8 pathname, and returning the
node-type (file, dir, symlink, etc.), or -1 on error, to the Java
level. I'd write another JNI function that takes a String and uses
the FSRef functions to return some integer-representable value to the
Java level. Many FSRef functions take names as UTF-16, not UTF-8.
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