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May 1, 2022 13:56
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module Binrep.Example.Tiff where | |
import Binrep | |
import Binrep qualified as BR | |
import Binrep.Type.Common ( Endianness(..) ) | |
import Binrep.Type.Int | |
import GHC.Generics ( Generic ) | |
import Data.Data ( Typeable, Data ) | |
import Data.ByteString qualified as B | |
type W8 = I 'U 'I1 'LE | |
brCfgNoSum :: BR.Cfg W8 | |
brCfgNoSum = BR.Cfg { BR.cSumTag = undefined } | |
data Tiff where | |
Tiff :: TiffBody e -> Tiff | |
deriving stock (Typeable) | |
instance Show Tiff where | |
show (Tiff body) = "Tiff " <> show body | |
data TiffBody (end :: Endianness) = TiffBody | |
{ tiffBodyExInt :: I 'U 'I4 end | |
} deriving stock (Generic, Typeable, Data, Show, Eq) | |
instance BLen (TiffBody end) where | |
blen = blenGeneric brCfgNoSum | |
instance (irep ~ I 'U 'I4 end, Put irep) => Put (TiffBody end) where | |
put = putGeneric brCfgNoSum | |
instance (irep ~ I 'U 'I4 end, Get irep) => Get (TiffBody end) where | |
get = getGeneric brCfgNoSum | |
instance Get Tiff where | |
get = do | |
c1 <- get @W8 | |
c2 <- get @W8 | |
case (c1, c2) of | |
(0x49, 0x49) -> do | |
body <- get @(TiffBody 'LE) | |
return $ Tiff body | |
(0x4d, 0x4d) -> do | |
body <- get @(TiffBody 'BE) | |
return $ Tiff body | |
_ -> fail "bad TIFF header" | |
tiffLEbs :: B.ByteString | |
tiffLEbs = B.pack [0x49, 0x49, 0xFF, 0x00, 0x00, 0x00] | |
tiffBEbs :: B.ByteString | |
tiffBEbs = B.pack [0x4d, 0x4d, 0x00, 0x00, 0x00, 0xFF] |
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