Added XXD module, useful for debuging bytestings.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/Text/XXD.hs b/src/Text/XXD.hs
new file mode 100644
index 00000000..d835b238
--- /dev/null
+++ b/src/Text/XXD.hs
@@ -0,0 +1,26 @@
+module Text.XXD where
+
+import qualified Data.ByteString.Base16 as Base16
+import Data.ByteString (ByteString)
+import qualified Data.ByteString as B
+import Data.Word
+import Data.Bits
+import Data.Char
+import Text.Printf
+
+nibble :: Word8 -> Char
+nibble b = intToDigit (fromIntegral (b .&. 0x0F))
+
+xxd :: Int -> ByteString -> [String]
+xxd offset bs | B.null bs = []
+xxd offset bs             = printf "%03x: %s" offset ds : xxd (offset + B.length xs) bs'
+ where
+    ds = unwords $ map (\byte -> [nibble (byte `shiftR` 4), nibble byte])
+                 $ B.unpack xs
+    (xs,bs') = B.splitAt 16 bs
+
+{-
+main = do
+    bs <- B.getContents
+    mapM_ putStrLn $ xxd 0 bs
+    -}