base16-0.2.0.1: RFC 4648-compliant Base16 encodings/decodings
Copyright(c) 2019 Emily Pillmore
LicenseBSD-style
MaintainerEmily Pillmore <emilypi@cohomolo.gy>
StabilityExperimental
Portabilityportable
Safe HaskellNone
LanguageHaskell2010

Data.Text.Encoding.Base16

Description

This module contains the combinators implementing the RFC 4648 specification for the Base16 encoding including unpadded and lenient variants for text values

Synopsis

Documentation

encodeBase16 :: Text -> Text Source #

Encode a Text value in Base16 with padding.

See: RFC-4648 section 8

decodeBase16 :: Text -> Either Text Text Source #

Decode a Base16-encoded lazy Text value.

See: RFC-4648 section 8

decodeBase16With Source #

Arguments

:: (ByteString -> Either err Text)

convert a bytestring to text (e.g. decodeUtf8')

-> Text

Input text to decode

-> Either (Base16Error err) Text 

Attempt to decode a lazy Text value as Base16, converting from ByteString to Text according to some encoding function. In practice, This is something like decodeUtf8', which may produce an error.

See: RFC-4648 section 8

Example:

decodeBase16With decodeUtf8'
  :: Text -> Either (Base16Error UnicodeException) Text

decodeBase16Lenient :: Text -> Text Source #

Decode a Base16-encoded lazy Text value leniently, using a strategy that never fails, catching unicode exceptions raised in the process of converting to text values.

N.B.: this is not RFC 4648-compliant.

isBase16 :: Text -> Bool Source #

Tell whether a Text value is Base16-encoded.

Examples:

This example will fail. It conforms to the alphabet, but is not valid because it has an incorrect (odd) length.

>>> isBase16 "666f6"
False

This example will succeed because it satisfies the alphabet and is considered "valid" (i.e. of the correct size and shape).

>>> isBase16 "666f"
True

isValidBase16 :: Text -> Bool Source #

Tell whether a Text value is a valid Base16 format.

This will not tell you whether or not this is a correct Base16 representation, only that it conforms to the correct shape. To check whether it is a true Base16 encoded Text value, use isBase16.

Examples:

This example will fail because it does not conform to the Hex alphabet.

>>> isValidBase16 "666f+/6"
False

This example will succeed because it satisfies the alphabet and is considered "valid" (i.e. of the correct size and shape), but is not correct base16 because it is the wrong shape.

>>> isValidBase16 "666f6"
True