Stephen Harris e1647a5a08 crypt: Fix obfuscate filename encryption method
Fix issue #1315 where filenames calculated with a base distance of zero
(ie the characters add up to 0(mod 256) aren't de-obfuscated on reading.
This was due to overloading of "0" to also mean "invalid UTF8; no rotation",
so we remove that double meaning
2017-04-22 09:16:00 +01:00
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