76 lines
2.2 KiB
Haskell
76 lines
2.2 KiB
Haskell
-- |
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-- Module : Crypto.Internal.ByteArray
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-- License : BSD-style
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-- Maintainer : Vincent Hanquez <vincent@snarc.org>
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-- Stability : stable
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-- Portability : Good
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--
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-- Simple and efficient byte array types
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--
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{-# LANGUAGE BangPatterns #-}
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{-# LANGUAGE MagicHash #-}
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{-# LANGUAGE UnboxedTuples #-}
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module Crypto.Internal.ByteArray
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( ByteArray(..)
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, byteArrayAllocAndFreeze
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, empty
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-- , split
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) where
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import Data.SecureMem
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import Crypto.Internal.Memory
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import Crypto.Internal.Compat
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import Crypto.Internal.Bytes
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import Foreign.Ptr
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import Foreign.ForeignPtr
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import Data.ByteString (ByteString)
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import qualified Data.ByteString as B (length)
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import qualified Data.ByteString.Internal as B
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class ByteArray ba where
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byteArrayAlloc :: Int -> (Ptr p -> IO ()) -> IO ba
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byteArrayLength :: ba -> Int
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withByteArray :: ba -> (Ptr p -> IO a) -> IO a
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instance ByteArray Bytes where
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byteArrayAlloc = bytesAlloc
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byteArrayLength = bytesLength
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withByteArray = withBytes
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instance ByteArray ByteString where
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byteArrayAlloc sz f = do
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fptr <- B.mallocByteString sz
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withForeignPtr fptr (f . castPtr)
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return $! B.PS fptr 0 sz
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byteArrayLength = B.length
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withByteArray b f = withForeignPtr fptr $ \ptr -> f (ptr `plusPtr` off)
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where (fptr, off, _) = B.toForeignPtr b
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instance ByteArray SecureMem where
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byteArrayAlloc sz f = do
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out <- allocateSecureMem sz
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withSecureMemPtr out (f . castPtr)
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return out
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byteArrayLength = secureMemGetSize
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withByteArray b f = withSecureMemPtr b (f . castPtr)
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byteArrayAllocAndFreeze :: ByteArray a => Int -> (Ptr p -> IO ()) -> a
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byteArrayAllocAndFreeze sz f = unsafeDoIO (byteArrayAlloc sz f)
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empty :: ByteArray a => a
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empty = unsafeDoIO (byteArrayAlloc 0 $ \_ -> return ())
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{-
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split :: ByteArray bs => Int -> bs -> (bs, bs)
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split n bs
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| n <= 0 = (empty, bs)
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| n >= len = (bs, empty)
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| otherwise = unsafeDoIO $ do
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withByteArray bs $ \p -> do
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b1 <- byteArrayAlloc n $ \r -> bufCopy r p n
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b2 <- byteArrayAlloc (len - n) $ \r -> bufCopy r (p `plusPtr` n) (len - n)
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return (b1, b2)
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where len = byteArrayLength bs
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-}
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