base64-string (empty) → 0.1

raw patch · 7 files changed

+539/−0 lines, 7 filesdep +basebuild-type:Customsetup-changed

Dependencies added: base

Files

• BSD3 +26/−0
• COPYING +6/−0
• Codec/Binary/Base64/String.hs +97/−0
• GPL-2 +340/−0
• Setup.hs +8/−0
• Test.hs +37/−0
• base64-string.cabal +25/−0

@@ -0,0 +1,26 @@+Copyright (c) Ian Lynagh.+All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions+are met:+1. Redistributions of source code must retain the above copyright+   notice, this list of conditions and the following disclaimer.+2. 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.+3. The names of the author may not be used to endorse or promote+   products derived from this software without specific prior written+   permission.++THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.

@@ -0,0 +1,6 @@++Copyright (c) Ian Lynagh, 2005, 2007.++This package can be used under either the GPL v2, as in ./GPL-2, or the+3-clause BSD, as in ./BSD3, license.+

@@ -0,0 +1,97 @@++-- Copyright (c) Ian Lynagh, 2005, 2007.++module Codec.Binary.Base64.String (encode, decode) where++import Data.Bits (shiftL, shiftR, (.&.), (.|.))+import Data.Char (ord, chr, isAscii, isAlphaNum, isUpper, isLower, isDigit)+import Data.List (intersperse)++chars_per_line :: Int+chars_per_line = 64+-- PEM mandates 64. MIME allows anything up to 76.++encode :: String -> String+encode = concat . intersperse "\n" . splits chars_per_line . enc++-- It is up to the caller to make sure the right sort of line breaks are+-- in the input+enc :: String -> String+enc (c1:c2:c3:cs) = toChar   (o1 `shiftR` 2)           -- First 6 bits of c1+                  : toChar (((o1 `shiftL` 4) .&. 0x30) -- Last 2 bits of c1+                         .|. (o2 `shiftR` 4))          -- First 4 bits of c2+                  : toChar (((o2 `shiftL` 2) .&. 0x3C) -- Last 4 bits of c2+                         .|. (o3 `shiftR` 6))          -- First 2 bits of c3+                  : toChar   (o3 .&. 0x3F)             -- Last 6 bits of c3+                  : enc cs+    where o1 = ord c1+          o2 = ord c2+          o3 = ord c3+enc [c1, c2] = toChar   (o1 `shiftR` 2)           -- First 6 bits of c1+             : toChar (((o1 `shiftL` 4) .&. 0x30) -- Last 2 bits of c1+                    .|. (o2 `shiftR` 4))          -- First 4 bits of c2+             : toChar  ((o2 `shiftL` 2) .&. 0x3C) -- Last 4 bits of c2+             : "="+    where o1 = ord c1+          o2 = ord c2+enc [c1] = toChar  (o1 `shiftR` 2)           -- First 6 bits of c1+         : toChar ((o1 `shiftL` 4) .&. 0x30) -- Last 2 bits of c1+         : "=="+    where o1 = ord c1+enc "" = ""++toChar :: Int -> Char+toChar n | n <= 25 = chr (ord 'A' + n)+         | n <= 51 = chr (ord 'a' + n - 26)+         | n <= 61 = chr (ord '0' + n - 52)+         | n == 62 = '+'+         | n == 63 = '/'+         | otherwise+             = error ("toChar: Can't happen: Bad input: " ++ show n)++decode :: String -> String+decode = dec . filter valid+    where valid c = isAscii c+                 && (isAlphaNum c || c == '+' || c == '/' || c == '=')++dec :: String -> String+dec "" = ""+dec ('=':_) = "" -- This can't be valid, so give up+dec (_:'=':_) = "" -- This can't be valid, so give up+dec (c1:c2:'=':_) -- Should have [c1,c2,'=','='], but if not we'd decode+                  -- this bit and stop anyway+ = take 1 $ dec [c1, c2, 'A', 'A']+dec (c1:c2:c3:'=':_) -- Should have [c1,c2,c3,'='], but if not we'd decode+                     -- this bit and stop anyway+ = take 2 $ dec [c1, c2, c3, 'A']+dec (c1:c2:c3:c4:cs)+ = let x1 = fromChar c1+       x2 = fromChar c2+       x3 = fromChar c3+       x4 = fromChar c4+   in -- 6 bits from x1, 2 bits from x2+      chr ((x1 `shiftL` 2) .|. (x2 `shiftR` 4))+      -- 4 bits from x2, 4 bits from x3+    : chr (((x2 `shiftL` 4) .&. 0xF0) .|. (x3 `shiftR` 2))+      -- 2 bits from x3, 6 bits from x4+    : chr (((x3 `shiftL` 6) .&. 0xC0) .|. x4)+    : dec cs+-- Drop more invalid things+dec [_] = ""+dec [_, _] = ""+dec [_, _, _] = ""++fromChar :: Char -> Int+fromChar c+ | isUpper c = ord c - ord 'A'+ | isLower c = ord c - ord 'a' + 26+ | isDigit c = ord c - ord '0' + 52+ | c == '+'  = 62+ | c == '/'  = 63+ | otherwise = error ("fromChar: Can't happen: Bad input: " ++ show c)++splits :: Int -> [a] -> [[a]]+splits _ [] = []+splits n xs = case splitAt n xs of+                  (ys, zs) -> ys:splits n zs+

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@@ -0,0 +1,8 @@++module Main (main) where++import Distribution.Simple++main :: IO ()+main = defaultMain+

@@ -0,0 +1,37 @@++module Main (main) where++import Codec.Binary.Base64.String++import Control.Monad+import System.Exit+import Test.HUnit++main :: IO ()+main = do counts <- runTestTT tests+          when ((errors counts, failures counts) /= (0, 0)) $+              exitWith (ExitFailure 1)++testData :: [(String, String)]+testData = [("",                "")+           ,("\0",              "AA==")+           ,("\255",            "/w==")+           ,("E",               "RQ==")+           ,("Ex",              "RXg=")+           ,("Exa",             "RXhh")+           ,("Exam",            "RXhhbQ==")+           ,("Examp",           "RXhhbXA=")+           ,("Exampl",          "RXhhbXBs")+           ,("Example",         "RXhhbXBsZQ==")+           ,("Ex\0am\255ple",   "RXgAYW3/cGxl")+           ]++tests :: Test+tests = TestList $ concat+      [ [ TestLabel ("encode " ++ show plain) (encoded_plain ~?= encoded),+          TestLabel ("decode " ++ show plain) (decoded_encoded ~?= plain) ]+      | (plain, encoded) <- testData,+        let encoded_plain = encode plain+            decoded_encoded = decode encoded+      ]+

@@ -0,0 +1,25 @@+Name:               base64-string+Version:            0.1+License:            OtherLicense+License-File:       COPYING+Copyright:          Ian Lynagh, 2005, 2007+Author:             Ian Lynagh+Maintainer:         igloo@earth.li+Stability:          experimental+Homepage:           http://urchin.earth.li/~ian/cabal/base64-string/+Synopsis:           Base64 implementation for String's.+Description:+    This Base64 implementation uses the characters+        A-Z a-z 0-9 + /+    along with+        =+    to signal the number of characters mod 3.+    It is compliant with both PEM (RFC 989 / RFC 1421) and MIME (RFC 2045).+Category:           Codec+Tested-With:        GHC==6.6+Build-Depends:      base+Extra-source-files: "BSD3", "GPL-2", "Test.hs"+Exposed-modules:+    Codec.Binary.Base64.String+GHC-Options: -O -Wall -Werror+