diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright 2009, Antoine Latter
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of the author nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
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+import Distribution.Simple
+main = defaultMain
diff --git a/System/ByteOrder.hs b/System/ByteOrder.hs
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--- /dev/null
+++ b/System/ByteOrder.hs
@@ -0,0 +1,56 @@
+{-
+
+Module : System.ByteOrder
+Copyright : (c) Antoine Latter 2009
+License : BSD3
+
+Maintainer : Antoine Latter <aslatter@gmail.com>
+Stability: unstable
+Portability: requires FFI
+
+-}
+module System.ByteOrder(byteOrder, ByteOrder(..)) where
+
+import Foreign.Marshal.Array
+import Foreign.Marshal.Alloc
+import Foreign.Storable
+import Foreign.Ptr
+import Foreign
+
+import Data.Word
+
+-- |Indicates the byte-ordering for a 4-byte value, where '1'
+-- indicates the most-significant byte and '4' indicates the
+-- least significant byte.
+--
+-- In this format, big endian byte order would be represented as:
+-- (1,2,3,4).
+--
+-- For convinience, the most common cases (BigEndian and LittleEndian)
+-- are provided their own constructors.
+data ByteOrder
+    = BigEndian
+    | LittleEndian
+    | Mixed (Word8, Word8, Word8, Word8)
+ deriving (Eq, Show, Read, Ord)
+
+input :: Word32
+input = 0x01020304
+
+-- |Returns the native byte ordering of the system.
+byteOrder :: ByteOrder
+byteOrder = unsafePerformIO $ byteOrderIO
+
+byteOrderIO :: IO ByteOrder
+byteOrderIO = byteListToByteOrder `fmap` wordToByteList input
+
+wordToByteList :: Word32 -> IO [Word8]
+wordToByteList word = alloca $ \wordPtr -> do
+         poke wordPtr input
+         peekArray 4 (castPtr wordPtr)
+
+byteListToByteOrder :: [Word8] -> ByteOrder
+byteListToByteOrder [1, 2, 3, 4] = BigEndian
+byteListToByteOrder [4, 3, 2, 1] = LittleEndian
+byteListToByteOrder xs@[x1, x2, x3, x4] = Mixed (x1,x2,x3,x4)
+
diff --git a/byteorder.cabal b/byteorder.cabal
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--- /dev/null
+++ b/byteorder.cabal
@@ -0,0 +1,20 @@
+Name:         byteorder
+Version:      1.0.0
+Cabal-Version:  >= 1.2
+Synopsis:      native byte-ordering of the system
+Description:   This package is for working with the native byte-ordering of
+  the system.
+
+License:      BSD3
+License-file: LICENSE
+Author:       Antoine Latter
+Maintainer:   Antoine Latter <aslatter@gmail.com>
+Homepage: http://community.haskell.org/~aslatter/code/byteorder
+Build-type: Simple
+
+Category: System
+
+Library
+
+ Build-depends: base
+ Exposed-modules: System.ByteOrder