Base64

This package can convert bytes to Base64 strings and vice versa.

Conversion

fromBytes : Bytes -> Maybe String

Convert bytes to a Base64 string. If you want more control over the process, you should use decoder.

This function should never return Nothing, but it uses Bytes.Decode.decode, which returns a Maybe String.

fromString : String -> Maybe String

Encode a string into a Base64 string. This function is a wrapper around fromBytes.

Similarly, it should never return Nothing, but alas, Bytes.Decode.decode, which fromBytes uses, returns a Maybe String.

toBytes : String -> Maybe Bytes

Convert a Base64 string to bytes. If you want more control over the process, you should use encoder.

This function fails (returns Nothing) if you give it an invalid Base64 sequence.

toString : String -> Maybe String

Decode a Base64 string into a string. This function is a wrapper around toBytes.

It will fail (return Nothing) if you give it an invalid Base64 sequence.

Slightly lower level functions.

fromBytes and toBytes functions are pretty much wrappers around these functions.

encoder : String -> Maybe Encoder

encoder returns a bytes encoder. It fails if the string that is passed to it is not a valid Base64 sequence.

It's used in toBytes:

toBytes : String -> Maybe Bytes
toBytes string =
    Maybe.map Bytes.Encode.encode (encoder string)

decoder : Int -> Decoder String

decoder width is a bytes decoder that will convert width bytes into a Base64 string.

It's used in fromBytes:

fromBytes : Bytes -> Maybe String
fromBytes bytes =
    Bytes.Decode.decode (decoder (Bytes.width bytes)) bytes