+
+isSafeChar ∷ Char → Bool
+{-# INLINEABLE isSafeChar #-}
+isSafeChar c
+ | c ≡ '/' = True
+ | isReserved c = False
+ | c > ' ' ∧ c ≤ '~' = True
+ | otherwise = False
+
+mkQueryString ∷ [(Text, Text)] → ByteString
+{-# INLINEABLE mkQueryString #-}
+mkQueryString = BS.intercalate (C8.singleton ';') ∘ map encodePair
+ where
+ encodePair ∷ (Text, Text) → ByteString
+ {-# INLINE encodePair #-}
+ encodePair (k, v)
+ = BS.intercalate (C8.singleton '=') [encodeText k, encodeText v]
+
+ encodeText ∷ Text → ByteString
+ {-# INLINE encodeText #-}
+ encodeText = toURLEncoded ∘ encodeUtf8
+
+toURLEncoded ∷ ByteString → ByteString
+{-# INLINEABLE toURLEncoded #-}
+toURLEncoded = C8.concatMap go
+ where
+ go ∷ Char → ByteString
+ {-# INLINE go #-}
+ go c | c ≡ ' ' = C8.singleton '+'
+ | isReserved c = urlEncode c
+ | isUnreserved c = C8.singleton c
+ | otherwise = urlEncode c
+
+ urlEncode ∷ Char → ByteString
+ {-# INLINE urlEncode #-}
+ urlEncode c = C8.pack ('%':toHex (ord c))
+
+ toHex ∷ Int → String
+ {-# INLINE toHex #-}
+ toHex n
+ = case showIntAtBase 16 toChrHex n "" of
+ [] → "00"
+ [c] → ['0', c]
+ cs → cs
+
+ toChrHex ∷ Int → Char
+ {-# INLINE toChrHex #-}
+ toChrHex d
+ | d < 10 = chr (ord '0' + fromIntegral d )
+ | otherwise = chr (ord 'A' + fromIntegral (d-10))