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|
{-# LANGUAGE CPP #-}
#if __GLASGOW_HASKELL__ >= 702
{-# LANGUAGE Trustworthy #-}
#endif
-- |
-- Module : Data.ByteString.Base64
-- Copyright : (c) 2010 Bryan O'Sullivan
--
-- License : BSD-style
-- Maintainer : Emily Pillmore <emilypi@cohomolo.gy>,
-- Herbert Valerio Riedel <hvr@gnu.org>,
-- Mikhail Glushenkov <mikhail.glushenkov@gmail.com>
-- Stability : experimental
-- Portability : GHC
--
-- Fast and efficient encoding and decoding of base64-encoded strings.
--
-- @since 0.1.0.0
module Data.ByteString.Base64
( encode
, decode
, decodeLenient
) where
import Data.ByteString.Base64.Internal
import qualified Data.ByteString as B
import Data.ByteString.Internal (ByteString(..))
import Data.Word (Word8)
import Foreign.ForeignPtr (ForeignPtr)
-- | Encode a string into base64 form. The result will always be a
-- multiple of 4 bytes in length.
encode :: ByteString -> ByteString
encode s = encodeWith Padded (mkEncodeTable alphabet) s
-- | Decode a base64-encoded string. This function strictly follows
-- the specification in
-- <http://tools.ietf.org/rfc/rfc4648 RFC 4648>.
--
-- (Note: this means that even @"\\n"@ and @"\\r\\n"@ as line breaks are rejected
-- rather than ignored. If you are using this in the context of a
-- standard that overrules RFC 4648 such as HTTP multipart mime bodies,
-- consider using 'decodeLenient'.)
decode :: ByteString -> Either String ByteString
decode s = decodeWithTable Padded decodeFP s
-- | Decode a base64-encoded string. This function is lenient in
-- following the specification from
-- <http://tools.ietf.org/rfc/rfc4648 RFC 4648>, and will not
-- generate parse errors no matter how poor its input.
decodeLenient :: ByteString -> ByteString
decodeLenient s = decodeLenientWithTable decodeFP s
alphabet :: ByteString
alphabet = B.pack $ [65..90] ++ [97..122] ++ [48..57] ++ [43,47]
{-# NOINLINE alphabet #-}
decodeFP :: ForeignPtr Word8
#if MIN_VERSION_bytestring(0,11,0)
BS decodeFP _ =
#else
PS decodeFP _ _ =
#endif
B.pack $ replicate 43 x
++ [62,x,x,x,63]
++ [52..61]
++ [x,x,x,done,x,x,x]
++ [0..25]
++ [x,x,x,x,x,x]
++ [26..51]
++ replicate 133 x
{-# NOINLINE decodeFP #-}
x :: Integral a => a
x = 255
{-# INLINE x #-}
|
