Quite a few modules were missing copyright notices. This commit adds copyright notices everywhere via haddock module headers. The old license boilerplate comment is redundant with this and has been removed. Update copyright years to 2019. Closes #4592.
80 lines
2.4 KiB
Haskell
80 lines
2.4 KiB
Haskell
{-# LANGUAGE NoImplicitPrelude #-}
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{-
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Copyright (C) 2010-2019 John MacFarlane <jgm@berkeley.edu>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-}
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{- |
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Module : Text.Pandoc.UUID
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Copyright : Copyright (C) 2010-2019 John MacFarlane
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License : GNU GPL, version 2 or above
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Maintainer : John MacFarlane <jgm@berkeley.edu>
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Stability : alpha
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Portability : portable
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UUID generation using Version 4 (random method) described
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in RFC4122. See http://tools.ietf.org/html/rfc4122
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-}
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module Text.Pandoc.UUID ( UUID(..), getRandomUUID, getUUID ) where
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import Prelude
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import Data.Bits (clearBit, setBit)
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import Data.Word
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import System.Random (RandomGen, getStdGen, randoms)
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import Text.Printf (printf)
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data UUID = UUID Word8 Word8 Word8 Word8 Word8 Word8 Word8 Word8
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Word8 Word8 Word8 Word8 Word8 Word8 Word8 Word8
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instance Show UUID where
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show (UUID a b c d e f g h i j k l m n o p) =
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"urn:uuid:" ++
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printf "%02x" a ++
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printf "%02x" b ++
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printf "%02x" c ++
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printf "%02x" d ++
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"-" ++
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printf "%02x" e ++
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printf "%02x" f ++
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"-" ++
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printf "%02x" g ++
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printf "%02x" h ++
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"-" ++
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printf "%02x" i ++
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printf "%02x" j ++
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"-" ++
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printf "%02x" k ++
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printf "%02x" l ++
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printf "%02x" m ++
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printf "%02x" n ++
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printf "%02x" o ++
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printf "%02x" p
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getUUID :: RandomGen g => g -> UUID
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getUUID gen =
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case take 16 (randoms gen :: [Word8]) of
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[a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p] ->
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-- set variant
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let i' = i `setBit` 7 `clearBit` 6
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-- set version (0100 for random)
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g' = g `clearBit` 7 `setBit` 6 `clearBit` 5 `clearBit` 4
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in UUID a b c d e f g' h i' j k l m n o p
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_ -> error "not enough random numbers for UUID" -- should not happen
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getRandomUUID :: IO UUID
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getRandomUUID = getUUID <$> getStdGen
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