some data types

[wavpack.git] / Codec / Audio / WavPack / Unpack.hs

diff --git a/Codec/Audio/WavPack/Unpack.hs b/Codec/Audio/WavPack/Unpack.hs
index f816657e9924e8b105b7bf99c232fdf5fb40332f..264072c71f7e3ce6f25dbbf32db5eccd48b49ed2 100644 (file)
--- a/Codec/Audio/WavPack/Unpack.hs
+++ b/Codec/Audio/WavPack/Unpack.hs
@@ -1,40 +1,4 @@
-{-# LANGUAGE
-    BangPatterns
-  , UnboxedTuples
-  , UnicodeSyntax
-  #-}

 module Codec.Audio.WavPack.Unpack
     (
     )
     where
 module Codec.Audio.WavPack.Unpack
     (
     )
     where

-import Codec.Audio.WavPack.Internal
-import Data.Bits
-import Data.Bitstream.Generic (Bitstream)
-import qualified Data.Bitstream.Generic as B
-import Data.Word
-import Prelude.Unicode
-
--- Read a single unsigned value from the specified bitstream with a
--- value from 0 to maxCode. If there are exactly a power of two number
--- of possible codes then this will read a fixed number of bits;
--- otherwise it reads the minimum number of bits and then determines
--- whether another bit is needed to define the code.
-readCode ∷ Bitstream bs ⇒ bs → Word32 → (# Word32, bs #)
-{-# INLINEABLE readCode #-}
-readCode bs 0       = (# 0, bs #)
-readCode bs 1       = (# b2n (B.head bs), B.tail bs #)
-readCode bs maxCode
-    = let !bitCount = countBits maxCode
-          !extras   = bit bitCount - maxCode - 1
-          !code     = B.toBits (B.take (bitCount - 1) bs)
-          (# code', bitCount' #)
-                    = if code ≥ extras then
-                          (# (code `shiftL` 1)
-                             - extras
-                             + b2n (bs B.!! bitCount)
-                           , bitCount #)
-                      else
-                          (# code, bitCount - 1 #)
-          !bs'      = B.drop bitCount' bs
-      in
-        (# code', bs' #)