Don't try to encrypt directories

Not overriding this works fine for ZipCrypto since it doesn't need to
write any extra data, but AES encrypted files need to store more
metadata even for zero-byte files.

Signed-off-by: Johannes Löthberg <johannes.loethberg@elokon.com>

fuzz/fuzz_targets/fuzz_write.rs

@@ -36,7 +36,7 @@ pub struct FuzzTestCase<'k> {
     flush_on_finish_file: bool,
 }
 
-fn do_operation<T>(
+fn do_operation<'k, T>(
     writer: &mut zip::ZipWriter<T>,
     operation: &FileOperation<'k>,
     abort: bool,

src/write.rs

@@ -1287,6 +1287,7 @@ impl<W: Write + Seek> ZipWriter<W> {
         }
         *options.permissions.as_mut().unwrap() |= 0o40000;
         options.compression_method = Stored;
+        options.encrypt_with = None;
 
         let name_as_string = name.into();
         // Append a slash to the filename if it does not end with it.