-- GENERATED by C->Haskell Compiler, version 0.16.5 Crystal Seed, 24 Jan 2009 (Haskell)
-- Edit the ORIGNAL .chs file instead!


{-# LINE 1 "./Network/GnuTLS/GnuTLSMonad.chs" #-}
module Network.GnuTLS.GnuTLSMonad(
	GnuTLSError(..),
	GnuTLSMonad,
        checkError,
	getDescription,
	withGnuTLS,
	gnuTLSCheckBool
	) where

import System.IO.Unsafe(unsafePerformIO)
import Control.Exception(finally)
import Control.Monad.Error
import Foreign.C.Types
import Foreign.C.String
import Foreign.Ptr



{-# LINE 20 "./Network/GnuTLS/GnuTLSMonad.chs" #-}

withGnuTLS :: IO a -> IO a
withGnuTLS act = do
	res <- gnutls_global_init
{-# LINE 24 "./Network/GnuTLS/GnuTLSMonad.chs" #-}
	unless (res==0) (fail "couldn't initialize gnutls")
	act `finally` gnutls_global_deinit
{-# LINE 26 "./Network/GnuTLS/GnuTLSMonad.chs" #-}

data GnuTLSError = GnuTLSError CInt deriving (Eq)

instance Error GnuTLSError where
	noMsg = GnuTLSError 0

getDescription :: GnuTLSError -> String
getDescription (GnuTLSError err) = unsafePerformIO $ gnutls_strerror err >>= peekCString

instance Show GnuTLSError where
	show err = getDescription err

type GnuTLSMonad a = Either GnuTLSError a

checkError :: CInt -> GnuTLSMonad ()
checkError 0 = Right ()
checkError i = Left (GnuTLSError i)

gnuTLSCheckBool :: CInt -> GnuTLSMonad Bool
gnuTLSCheckBool 0 = return False
gnuTLSCheckBool 1 = return True
gnuTLSCheckBool i = Left (GnuTLSError i)

foreign import ccall unsafe "Network/GnuTLS/GnuTLSMonad.chs.h gnutls_global_init"
  gnutls_global_init :: (IO CInt)

foreign import ccall unsafe "Network/GnuTLS/GnuTLSMonad.chs.h gnutls_global_deinit"
  gnutls_global_deinit :: (IO ())

foreign import ccall safe "Network/GnuTLS/GnuTLSMonad.chs.h gnutls_strerror"
  gnutls_strerror :: (CInt -> (IO (Ptr CChar)))