diff -r 87256cd957b9 -r 70ca07ab2dcf gameServer/Codec/Binary/Base64.hs --- a/gameServer/Codec/Binary/Base64.hs Sat Apr 11 10:58:18 2009 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,113 +0,0 @@ --- | --- Module : Codec.Binary.Base64 --- Copyright : (c) 2007 Magnus Therning --- License : BSD3 --- --- Implemented as specified in RFC 4648 --- (). --- --- Further documentation and information can be found at --- . -module Codec.Binary.Base64 - ( encode - , decode - , decode' - , chop - , unchop - ) where - -import Control.Monad -import Data.Array -import Data.Bits -import Data.Maybe -import Data.Word -import qualified Data.Map as M - --- {{{1 enc/dec map -_encMap = - [ (0, 'A'), (1, 'B'), (2, 'C'), (3, 'D'), (4, 'E') - , (5, 'F') , (6, 'G'), (7, 'H'), (8, 'I'), (9, 'J') - , (10, 'K'), (11, 'L'), (12, 'M'), (13, 'N'), (14, 'O') - , (15, 'P'), (16, 'Q'), (17, 'R'), (18, 'S'), (19, 'T') - , (20, 'U'), (21, 'V'), (22, 'W'), (23, 'X'), (24, 'Y') - , (25, 'Z'), (26, 'a'), (27, 'b'), (28, 'c'), (29, 'd') - , (30, 'e'), (31, 'f'), (32, 'g'), (33, 'h'), (34, 'i') - , (35, 'j'), (36, 'k'), (37, 'l'), (38, 'm'), (39, 'n') - , (40, 'o'), (41, 'p'), (42, 'q'), (43, 'r'), (44, 's') - , (45, 't'), (46, 'u'), (47, 'v'), (48, 'w'), (49, 'x') - , (50, 'y'), (51, 'z'), (52, '0'), (53, '1'), (54, '2') - , (55, '3'), (56, '4'), (57, '5'), (58, '6'), (59, '7') - , (60, '8'), (61, '9'), (62, '+'), (63, '/') ] - --- {{{1 encodeArray -encodeArray :: Array Word8 Char -encodeArray = array (0, 64) _encMap - --- {{{1 decodeMap -decodeMap :: M.Map Char Word8 -decodeMap = M.fromList [(snd i, fst i) | i <- _encMap] - --- {{{1 encode --- | Encode data. -encode :: [Word8] - -> String -encode = let - pad n = take n $ repeat 0 - enc [] = "" - enc l@[o] = (++ "==") . take 2 .enc $ l ++ pad 2 - enc l@[o1, o2] = (++ "=") . take 3 . enc $ l ++ pad 1 - enc (o1:o2:o3:os) = let - i1 = o1 `shiftR` 2 - i2 = (o1 `shiftL` 4 .|. o2 `shiftR` 4) .&. 0x3f - i3 = (o2 `shiftL` 2 .|. o3 `shiftR` 6) .&. 0x3f - i4 = o3 .&. 0x3f - in (foldr (\ i s -> (encodeArray ! i) : s) "" [i1, i2, i3, i4]) ++ enc os - in enc - --- {{{1 decode --- | Decode data (lazy). -decode' :: String - -> [Maybe Word8] -decode' = let - pad n = take n $ repeat $ Just 0 - dec [] = [] - dec l@[Just eo1, Just eo2] = take 1 . dec $ l ++ pad 2 - dec l@[Just eo1, Just eo2, Just eo3] = take 2 . dec $ l ++ pad 1 - dec (Just eo1:Just eo2:Just eo3:Just eo4:eos) = let - o1 = eo1 `shiftL` 2 .|. eo2 `shiftR` 4 - o2 = eo2 `shiftL` 4 .|. eo3 `shiftR` 2 - o3 = eo3 `shiftL` 6 .|. eo4 - in Just o1:Just o2:Just o3:(dec eos) - dec _ = [Nothing] - in - dec . map (flip M.lookup decodeMap) . takeWhile (/= '=') - --- | Decode data (strict). -decode :: String - -> Maybe [Word8] -decode = sequence . decode' - --- {{{1 chop --- | Chop up a string in parts. --- --- The length given is rounded down to the nearest multiple of 4. --- --- /Notes:/ --- --- * PEM requires lines that are 64 characters long. --- --- * MIME requires lines that are at most 76 characters long. -chop :: Int -- ^ length of individual lines - -> String - -> [String] -chop n "" = [] -chop n s = let - enc_len | n < 4 = 4 - | otherwise = n `div` 4 * 4 - in (take enc_len s) : chop n (drop enc_len s) - --- {{{1 unchop --- | Concatenate the strings into one long string. -unchop :: [String] - -> String -unchop = foldr (++) ""