more error handling for decoding functions

Main.hs

@@ -13,6 +13,7 @@ import TextShow.Data.Integral (showbBin, showbOct)
 import Text.Ascii (fromBinDigit, fromOctDigit)
 import Codec.CBOR.Magic (intToWord64)
 import qualified Data.Either.Unwrap as U
+import Data.Bytes.Text.Latin1 as Latin1
 import qualified Codec.Binary.Base91 as B91
 import qualified Codec.Binary.Base85 as B85
 import qualified Codec.Binary.Base64 as B64
@@ -31,6 +32,7 @@ import qualified Data.Bytes as Bytes
 import qualified Data.Bytes.Text.Ascii as ASCII
 import Data.Bytes.Get (getWord64host)
 import Data.ByteString.UTF8 as BSU      -- from utf8-string
+-- import Data.ByteString (singleton)
 import qualified Data.ByteString.Char8 as C
 
 data Based = Decode { 
@@ -89,13 +91,13 @@ data Based = Decode {
 encodeToBase64 :: C.ByteString -> Either String C.ByteString
 encodeToBase64 bs =
    case B64.encode bs of
-     encoded | C.null encoded -> Left "Failed to encode base64."
+     encoded | C.null encoded -> Left "Failed to encode Base64.\n"
              | otherwise -> Right encoded
 
 decodeFromBase64 :: C.ByteString -> Either String C.ByteString
 decodeFromBase64 bs =
    case B64L.decodeLenient bs of 
-     decoded | C.null decoded -> Left "Failed to decode from base64."
+     decoded | C.null decoded -> Left "Failed to decode from Base64.\n"
              | otherwise -> Right decoded
              -- | otherwise -> Right (BSU.toString decoded)
      -- Left err -> Left $ "Failed to decode from base64: " ++ err
@@ -114,6 +116,10 @@ octToInt (x : xs) = x + 8 * octToInt xs
 
 dec91 :: String -> String
 dec91 = C.unpack . B91.decode
+-- dec91 input =
+--    case singleton . B91.decode input of
+--      Right decoded -> C.unpack decoded
+--      Left _ -> "Error decoding Base91.\n"
 
 enc91 :: String -> String
 enc91 = B91.encode . BSU.fromString
@@ -121,10 +127,9 @@ enc91 = B91.encode . BSU.fromString
 -- dec85 = C.unpack . U.fromRight . B85.decode . BSU.fromString
 dec85 :: String -> String
 dec85 input =
-   let decoded = B85.decode (BSU.fromString input)
-    in case decoded of
+    case B85.decode (BSU.fromString input) of
      Right decodedStr -> C.unpack decodedStr
-     Left (decodedStr, _) -> C.unpack decodedStr
+     Left _ -> "Error decoding Base85.\n"
 
 enc85 :: String -> String
 enc85 = C.unpack . B85.encode . BSU.fromString
@@ -144,27 +149,33 @@ enc64 input =
      Left errMsg -> "Error: " ++ errMsg
 
 dec64url :: String -> String
-dec64url = C.unpack . U.fromRight . B64U.decode . BSU.fromString
+-- dec64url = C.unpack . U.fromRight . B64U.decode . BSU.fromString
+dec64url input =
+   case B64.decode (BSU.fromString input)  of
+     Right decoded -> C.unpack decoded
+     Left _ -> "Error decoding Base64 for URLs.\n"
 
 enc64url :: String -> String
 enc64url = C.unpack . B64U.encode . BSU.fromString
 
-
 decurl :: String -> String
 decurl = HB.urlDecode 
 
 encurl :: String -> String
 encurl = HB.urlEncode
 
-dec62 = show . fromJust . B62.decode128 . (Bytes.fromByteString . BSU.fromString)
-enc62 = C.unpack . BSU.fromString. Bytes.toLatinString . (Bytes.fromByteArray . ( B62.encode64 . (intToWord64 . decimalStringToInt)))
+dec62 :: String -> String
+-- dec62 = show . fromJust . B62.decode128 . (Bytes.fromByteString . BSU.fromString)
+dec62 input =
+   maybe "Error decoding Base62.\n" show (B62.decode128 (Bytes.fromByteString (BSU.fromString input)))
+
+enc62 :: String -> String
+enc62 = C.unpack . BSU.fromString. Latin1.toString . (Bytes.fromByteArray . ( B62.encode64 . (intToWord64 . decimalStringToInt)))
 
 dec58 :: String -> String
 -- dec58 = C.unpack . fromJust . B58.decodeBase58 . pack 
 dec58 input = 
-   case B58.decodeBase58 (pack input) of
-     Just decoded -> (C.unpack decoded)
-     Nothing -> "Error decoding Base58"
+   maybe "Error decoding Base58.\n" C.unpack (B58.decodeBase58 (pack input))
 
 enc58 :: String -> String
 enc58 = unpack . B58.encodeBase58 . BSU.fromString
@@ -174,7 +185,7 @@ dec32 :: String -> String
 dec32 input =
    case B32.decode (BSU.fromString input) of
      Right decoded -> C.unpack decoded
-     Left _ -> "Error decoding Base32"
+     Left _ -> "Error decoding Base32.\n"
 
 enc32 :: String -> String
 enc32 = C.unpack . B32.encode . BSU.fromString
@@ -184,11 +195,17 @@ dec16 :: String -> String
 dec16 input =
    case B16.decode (BSU.fromString input) of
      Right decoded -> C.unpack decoded
-     Left _ -> "Error decoding Base16"
+     Left _ -> "Error decoding Base16.\n"
 
+enc16 :: String -> String
 enc16 = C.unpack . B16.encode . BSU.fromString
+
+dec10:: String -> String
 dec10 = show . hexStringToInt 
+
+enc10 :: String -> String
 enc10 = C.unpack . BSU.fromString . intToHexString . decimalStringToInt -- Depending on what you want,  do enc10 = show . map ord
+
 dec8  = C.unpack . encodeUtf8 . toText . showbOct . hexStringToInt
 enc8  = C.unpack . BSU.fromString . intToHexString . octToInt . (reverse . (map fromJust . (map fromOctDigit)))
 dec2  = C.unpack . encodeUtf8 . toText . showbBin . hexStringToInt
@@ -199,7 +216,7 @@ decqp :: String -> String
 decqp input =
    case QP.decode (BSU.fromString input) of
      Right decoded -> C.unpack decoded
-     Left _ -> "Error decoding QP"
+     Left _ -> "Error decoding QP.\n"
 
 encqp :: String -> String
 encqp = C.unpack . QP.encode . BSU.fromString
@@ -209,7 +226,7 @@ decuu :: String -> String
 decuu input =
    case UU.decode (BSU.fromString input) of
      Right decoded -> C.unpack decoded
-     Left _ -> "Error decoding UU."
+     Left _ -> "Error decoding UU.\n"
 
 encuu :: String -> String
 encuu = C.unpack . UU.encode . BSU.fromString
@@ -219,7 +236,7 @@ decxx :: String -> String
 decxx input =
    case XX.decode (BSU.fromString input) of
      Right decoded -> C.unpack decoded
-     Left _ -> "Error decoding XX."
+     Left _ -> "Error decoding XX.\n"
 
 encxx :: String -> String
 encxx = C.unpack . XX.encode . BSU.fromString