Crisis.Ionic.Zip.ZipEntry.MaybeApplyEncryption C# (CSharp) Method

        private Stream MaybeApplyEncryption(Stream s)
        {
            if (Encryption == EncryptionAlgorithm.PkzipWeak)
            {
                TraceWriteLine("MaybeApplyEncryption: e({0}) PKZIP", FileName);

                return new ZipCipherStream(s, _zipCrypto_forWrite, CryptoMode.Encrypt);
            }
#if AESCRYPTO
            if (Encryption == EncryptionAlgorithm.WinZipAes128 ||
                     Encryption == EncryptionAlgorithm.WinZipAes256)
            {
                TraceWriteLine("MaybeApplyEncryption: e({0}) AES", FileName);

                return new WinZipAesCipherStream(s, _aesCrypto_forWrite, CryptoMode.Encrypt);
            }
#endif
            TraceWriteLine("MaybeApplyEncryption: e({0}) None", FileName);

            return s;
        }