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{-# OPTIONS_GHC -fno-warn-orphans #-}
{- Copyright 2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module ByteStrings where
import qualified Data.ByteString as B
import qualified Raaz
import Control.Monad
import Data.Word
allByteStringsOfLength :: Int -> [B.ByteString]
allByteStringsOfLength = go []
where
go ws n
| n == 0 = return (B.pack ws)
| otherwise = do
w <- [0..255]
go (w:ws) (n-1)
-- | Contains every possible byte strings, with shorter ones first.
allByteStrings :: [B.ByteString]
allByteStrings = concatMap allByteStringsOfLength [1..]
chunkByteString :: Int -> B.ByteString -> [B.ByteString]
chunkByteString n = go []
where
go cs b
| B.length b <= n = reverse (b:cs)
| otherwise =
let (h, t) = B.splitAt n b
in go (h:cs) t
instance Raaz.Random Word8
randomByteStringOfLength :: Int -> Raaz.SystemPRG -> IO B.ByteString
randomByteStringOfLength n prg = B.pack <$> replicateM n randbyte
where
randbyte = Raaz.random prg :: IO Word8
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