Copyright | (c) 2019-2020 Emily Pillmore |
---|---|
License | BSD-style |
Maintainer | Emily Pillmore <emilypi@cohomolo.gy> |
Stability | stable |
Portability | non-portable |
Safe Haskell | Trustworthy |
Language | Haskell2010 |
This module contains ByteString
-valued combinators for
implementing the RFC 4648 specification of the Base32
encoding format. This includes strictly padded/unpadded
decoding variants, as well as internal and external validation for canonicity.
Synopsis
- encodeBase32 :: ByteString -> Text
- encodeBase32' :: ByteString -> ByteString
- encodeBase32Unpadded :: ByteString -> Text
- encodeBase32Unpadded' :: ByteString -> ByteString
- decodeBase32 :: ByteString -> Either Text ByteString
- decodeBase32Unpadded :: ByteString -> Either Text ByteString
- decodeBase32Padded :: ByteString -> Either Text ByteString
- isBase32 :: ByteString -> Bool
- isValidBase32 :: ByteString -> Bool
Encoding
encodeBase32 :: ByteString -> Text Source #
Encode a ByteString
value as a Base32 Text
value with padding.
See: RFC-4648 section 6
Examples:
>>>
encodeBase32 "Sun"
"KN2W4==="
encodeBase32' :: ByteString -> ByteString Source #
Encode a ByteString
as a Base32 ByteString
value with padding.
See: RFC-4648 section 6
Examples:
>>>
encodeBase32 "Sun"
"KN2W4==="
encodeBase32Unpadded :: ByteString -> Text Source #
Encode a ByteString
value as Base32 Text
without padding. Note that for Base32,
padding is optional. If you call this function, you will simply be encoding
as Base32 and stripping padding chars from the output.
See: RFC-4648 section 6
Examples:
>>>
encodeBase32Unpadded "Sun"
"KN2W4"
encodeBase32Unpadded' :: ByteString -> ByteString Source #
Encode a ByteString
value as Base32 without padding. Note that for Base32,
padding is optional. If you call this function, you will simply be encoding
as Base32 and stripping padding chars from the output.
See: RFC-4648 section 6
Examples:
>>>
encodeBase32Unpadded' "Sun"
"KN2W4"
Decoding
decodeBase32 :: ByteString -> Either Text ByteString Source #
Decode an arbitrarily padded Base32 encoded ByteString
value. If its length is not a multiple
of 4, then padding chars will be added to fill out the input to a multiple of
4 for safe decoding as Base32-encoded values are optionally padded.
See: RFC-4648 section 6
Examples:
>>>
decodeBase32 "KN2W4==="
Right "Sun"
>>>
decodeBase32 "KN2W4"
Right "Sun"
>>>
decodeBase32 "KN2W==="
Left "Base32-encoded bytestring has invalid padding"
decodeBase32Unpadded :: ByteString -> Either Text ByteString Source #
Decode an unpadded Base32-encoded ByteString
value. Input strings are
required to be unpadded, and will undergo validation prior to decoding to
confirm.
In general, unless unpadded Base32 is explicitly required, it is
safer to call decodeBase32
.
See: RFC-4648 section 6
Examples:
>>>
decodeBase32Unpadded "KN2W4"
Right "Sun"
>>>
decodeBase32Unpadded "KN2W4==="
Left "Base32-encoded bytestring has invalid padding"
decodeBase32Padded :: ByteString -> Either Text ByteString Source #
Decode a padded Base32-encoded ByteString
value. Input strings are
required to be correctly padded, and will be validated prior to decoding
to confirm.
In general, unless padded Base32 is explicitly required, it is
safer to call decodeBase32
.
See: RFC-4648 section 6
Examples:
>>>
decodeBase32Padded "KN2W4==="
Right "Sun"
>>>
decodeBase32Padded "KN2W4"
Left "Base32-encoded bytestring requires padding"
Validation
isBase32 :: ByteString -> Bool Source #
Tell whether a ByteString
is Base32-encoded.
Examples:
>>>
isBase32 "KN2W4"
True
>>>
isBase32 "KN2W4==="
True
>>>
isBase32 "KN2W4=="
False
isValidBase32 :: ByteString -> Bool Source #
Tell whether a ByteString
is a valid Base32 format.
This will not tell you whether or not this is a correct Base32 representation,
only that it conforms to the correct shape. To check whether it is a true
Base32 encoded ByteString
value, use isBase32
.
Examples:
>>>
isValidBase32 "KN2W4"
True
>>>
isValidBase32 "KN2W4="
False
>>>
isValidBase32 "KN2W4%"
False