Support suffix byte range specifiers.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

diff --git a/StaticCat.hs b/StaticCat.hs
index b5d03fc6db23fc0170284f2b085b91c68d874e73..396403bcd6035adb4c73df6f7c661d3a09c03e66 100644 (file)
--- a/StaticCat.hs
+++ b/StaticCat.hs
@@ -123,6 +123,8 @@ checkIfRange mTime = do
       return $ if parseHTTPDate ir == Just mTime then Just () else Nothing
 
 parseRange :: String -> FileOffset -> Maybe (FileOffset, FileOffset)
+parseRange (splitAt 6 -> ("bytes=", '-':(readDec -> [(len, "")]))) size =
+    Just (max 0 (size - len), size - 1)
 parseRange (splitAt 6 -> ("bytes=", readDec -> [(a, "-")])) size =
     Just (a, size - 1)
 parseRange (splitAt 6 -> ("bytes=", readDec -> [(a, '-':(readDec -> [(b, "")]))])) size =