binary-varint (empty) → 0.1.0.0

raw patch · 5 files changed

+111/−0 lines, 5 filesdep +basedep +binary

Dependencies added: base, binary

Files

• CHANGELOG.md +0/−0
• LICENSE +30/−0
• README.md +1/−0
• binary-varint.cabal +44/−0
• src/Data/Binary/VarInt.hs +36/−0

@@ -0,0 +1,30 @@+Copyright (c) 2018, Monadic GmbH++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * 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.++    * Neither the name of Monadic GmbH nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT+OWNER 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 +1,1 @@+Haskell base-128 variable-width integers ([VarInts](https://developers.google.com/protocol-buffers/docs/encoding#varints)) via [Data.Binary](https://hackage.haskell.org/package/binary).

@@ -0,0 +1,44 @@+cabal-version: 2.2+build-type:    Simple++name:          binary-varint+version:       0.1.0.0+synopsis:      VarInt encoding/decoding via Data.Binary+homepage:      https://github.com/oscoin/ipfs+bug-reports:   https://github.com/oscoin/ipfs/issues+license:       BSD-3-Clause+license-file:  LICENSE+author:        Kim Altintop+maintainer:    Kim Altintop <kim@monadic.xyz>, Monadic Team <team@monadic.xyz>+copyright:     2018 Monadic GmbH++category:      Data++extra-source-files:+      CHANGELOG.md+    , README.md++source-repository head+    type: git+    location: https://github.com/oscoin/ipfs++common common+    default-language: Haskell2010+    ghc-options:+        -Wall+        -Wcompat+        -Wincomplete-uni-patterns+        -Wincomplete-record-updates+        -Wredundant-constraints+        -fprint-expanded-synonyms+        -funbox-small-strict-fields++library+    import: common+    hs-source-dirs: src+    exposed-modules:+        Data.Binary.VarInt++    build-depends:+        base >= 4.9 && < 5+      , binary >= 0.8.3

@@ -0,0 +1,36 @@+-- |+-- Copyright   : 2018 Monadic GmbH+-- License     : BSD3+-- Maintainer  : kim@monadic.xyz, team@monadic.xyz+-- Stability   : stable+-- Portability : portable+--+module Data.Binary.VarInt+    ( getVarInt+    , putVarInt+    , buildVarInt+    )+where++import qualified Data.Binary as Binary+import           Data.Binary.Builder (Builder)+import qualified Data.Binary.Builder as Builder+import qualified Data.Binary.Put as Binary (putLazyByteString)+import           Data.Bits+import           Data.Word (Word8)++getVarInt :: (Num a, Bits a) => Word8 -> Binary.Get a+getVarInt n+    | testBit n 7 = do+        v <- Binary.getWord8 >>= getVarInt+        pure $ shiftL v 7 .|. clearBit (fromIntegral n) 7+    | otherwise = pure $ fromIntegral n++putVarInt :: (Integral a, Bits a) => a -> Binary.Put+putVarInt = Binary.putLazyByteString . Builder.toLazyByteString . buildVarInt++buildVarInt :: (Integral a, Bits a) => a -> Builder+buildVarInt n+    | n < 0x80  = Builder.singleton $ fromIntegral n+    | otherwise = Builder.singleton (setBit (fromIntegral n) 7)+               <> buildVarInt (shiftR n 7)