{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE PackageImports #-}
{-# OPTIONS_HADDOCK hide #-}
module Codec.Archive.Tar.Read
( read
, FormatError(..)
) where
import Codec.Archive.Tar.PackAscii
import Codec.Archive.Tar.Types
import Data.Char (ord)
import Data.Int (Int64)
import Data.Bits (Bits(shiftL, (.&.), complement))
import Control.Exception (Exception(..))
import Data.Typeable (Typeable)
import Control.Applicative
import Control.Monad
import Control.DeepSeq
import Control.Monad.Trans.State.Lazy
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as BS.Char8
import qualified Data.ByteString.Unsafe as BS
import qualified Data.ByteString.Lazy as LBS
import System.IO.Unsafe (unsafePerformIO)
import "os-string" System.OsString.Posix (PosixString, PosixChar)
import qualified "os-string" System.OsString.Posix as PS
import Prelude hiding (read)
data FormatError
= TruncatedArchive
| ShortTrailer
| BadTrailer
| TrailingJunk
| ChecksumIncorrect
| NotTarFormat
| UnrecognisedTarFormat
|
deriving (FormatError -> FormatError -> Bool
(FormatError -> FormatError -> Bool)
-> (FormatError -> FormatError -> Bool) -> Eq FormatError
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: FormatError -> FormatError -> Bool
== :: FormatError -> FormatError -> Bool
$c/= :: FormatError -> FormatError -> Bool
/= :: FormatError -> FormatError -> Bool
Eq, Int -> FormatError -> ShowS
[FormatError] -> ShowS
FormatError -> String
(Int -> FormatError -> ShowS)
-> (FormatError -> String)
-> ([FormatError] -> ShowS)
-> Show FormatError
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> FormatError -> ShowS
showsPrec :: Int -> FormatError -> ShowS
$cshow :: FormatError -> String
show :: FormatError -> String
$cshowList :: [FormatError] -> ShowS
showList :: [FormatError] -> ShowS
Show, Typeable)
instance Exception FormatError where
displayException :: FormatError -> String
displayException FormatError
TruncatedArchive = String
"truncated tar archive"
displayException FormatError
ShortTrailer = String
"short tar trailer"
displayException FormatError
BadTrailer = String
"bad tar trailer"
displayException FormatError
TrailingJunk = String
"tar file has trailing junk"
displayException FormatError
ChecksumIncorrect = String
"tar checksum error"
displayException FormatError
NotTarFormat = String
"data is not in tar format"
displayException FormatError
UnrecognisedTarFormat = String
"tar entry not in a recognised format"
displayException FormatError
HeaderBadNumericEncoding = String
"tar header is malformed (bad numeric encoding)"
instance NFData FormatError where
rnf :: FormatError -> ()
rnf !FormatError
_ = ()
read :: LBS.ByteString -> Entries FormatError
read :: ByteString -> Entries FormatError
read = State ByteString (Entries FormatError)
-> ByteString -> Entries FormatError
forall s a. State s a -> s -> a
evalState ((Int64 -> StateT ByteString Identity ByteString)
-> StateT ByteString Identity ByteString
-> State ByteString (Entries FormatError)
forall (m :: * -> *).
Monad m =>
(Int64 -> m ByteString) -> m ByteString -> m (Entries FormatError)
readStreaming Int64 -> StateT ByteString Identity ByteString
getN StateT ByteString Identity ByteString
forall (m :: * -> *) s. Monad m => StateT s m s
get)
where
getN :: Int64 -> State LBS.ByteString LBS.ByteString
getN :: Int64 -> StateT ByteString Identity ByteString
getN Int64
n = do
(ByteString
pref, ByteString
st) <- Int64 -> ByteString -> (ByteString, ByteString)
LBS.splitAt Int64
n (ByteString -> (ByteString, ByteString))
-> StateT ByteString Identity ByteString
-> StateT ByteString Identity (ByteString, ByteString)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> StateT ByteString Identity ByteString
forall (m :: * -> *) s. Monad m => StateT s m s
get
ByteString -> StateT ByteString Identity ()
forall (m :: * -> *) s. Monad m => s -> StateT s m ()
put ByteString
st
ByteString -> StateT ByteString Identity ByteString
forall a. a -> StateT ByteString Identity a
forall (f :: * -> *) a. Applicative f => a -> f a
pure ByteString
pref
readStreaming
:: Monad m
=> (Int64 -> m LBS.ByteString)
-> m LBS.ByteString
-> m (Entries FormatError)
readStreaming :: forall (m :: * -> *).
Monad m =>
(Int64 -> m ByteString) -> m ByteString -> m (Entries FormatError)
readStreaming = ((forall a. m a -> m a)
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
-> m (Entries FormatError)
forall (m :: * -> *) e tarPath linkTarget.
Monad m =>
(forall a. m a -> m a)
-> m (Either e (Maybe (GenEntry tarPath linkTarget)))
-> m (GenEntries tarPath linkTarget e)
unfoldEntriesM m a -> m a
forall a. a -> a
forall a. m a -> m a
id (m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
-> m (Entries FormatError))
-> (m ByteString
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget))))
-> m ByteString
-> m (Entries FormatError)
forall b c a. (b -> c) -> (a -> b) -> a -> c
.) ((m ByteString
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget))))
-> m ByteString -> m (Entries FormatError))
-> ((Int64 -> m ByteString)
-> m ByteString
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget))))
-> (Int64 -> m ByteString)
-> m ByteString
-> m (Entries FormatError)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Int64 -> m ByteString)
-> m ByteString
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall (m :: * -> *).
Monad m =>
(Int64 -> m ByteString)
-> m ByteString
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
getEntryStreaming
getEntryStreaming
:: Monad m
=> (Int64 -> m LBS.ByteString)
-> m LBS.ByteString
-> m (Either FormatError (Maybe Entry))
getEntryStreaming :: forall (m :: * -> *).
Monad m =>
(Int64 -> m ByteString)
-> m ByteString
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
getEntryStreaming Int64 -> m ByteString
getN m ByteString
getAll = do
ByteString
header <- Int64 -> m ByteString
getN Int64
512
if ByteString -> Int64
LBS.length ByteString
header Int64 -> Int64 -> Bool
forall a. Ord a => a -> a -> Bool
< Int64
512 then Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a. a -> m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (FormatError
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. a -> Either a b
Left FormatError
TruncatedArchive) else do
if (Word8 -> Bool) -> ByteString -> Bool
LBS.all (Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
0) ByteString
header then do
ByteString
nextBlock <- Int64 -> m ByteString
getN Int64
512
if ByteString -> Int64
LBS.length ByteString
nextBlock Int64 -> Int64 -> Bool
forall a. Ord a => a -> a -> Bool
< Int64
512 then Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a. a -> m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (FormatError
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. a -> Either a b
Left FormatError
ShortTrailer)
else if (Word8 -> Bool) -> ByteString -> Bool
LBS.all (Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
0) ByteString
nextBlock then do
ByteString
remainder <- m ByteString
getAll
Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a. a -> m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget))))
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a b. (a -> b) -> a -> b
$ if (Word8 -> Bool) -> ByteString -> Bool
LBS.all (Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
0) ByteString
remainder then Maybe (GenEntry TarPath LinkTarget)
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. b -> Either a b
Right Maybe (GenEntry TarPath LinkTarget)
forall a. Maybe a
Nothing else FormatError
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. a -> Either a b
Left FormatError
TrailingJunk
else Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a. a -> m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (FormatError
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. a -> Either a b
Left FormatError
BadTrailer)
else case ByteString
-> Either
FormatError
(ByteString, Permissions, Int, Int, Int64, Int64, Char, ByteString,
Format, ByteString, ByteString, Int, Int, ByteString)
parseHeader ByteString
header of
Left FormatError
err -> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a. a -> m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget))))
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a b. (a -> b) -> a -> b
$ FormatError
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. a -> Either a b
Left FormatError
err
Right (ByteString
name, Permissions
mode, Int
uid, Int
gid, Int64
size, Int64
mtime, Char
typecode, ByteString
linkname, Format
format, ByteString
uname, ByteString
gname, Int
devmajor, Int
devminor, ByteString
prefix) -> do
let paddedSize :: Int64
paddedSize = (Int64
size Int64 -> Int64 -> Int64
forall a. Num a => a -> a -> a
+ Int64
511) Int64 -> Int64 -> Int64
forall a. Bits a => a -> a -> a
.&. Int64 -> Int64
forall a. Bits a => a -> a
complement Int64
511
ByteString
paddedContent <- Int64 -> m ByteString
getN Int64
paddedSize
let content :: ByteString
content = Int64 -> ByteString -> ByteString
LBS.take Int64
size ByteString
paddedContent
Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a. a -> m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget))))
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
-> m (Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
forall a b. (a -> b) -> a -> b
$ Maybe (GenEntry TarPath LinkTarget)
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. b -> Either a b
Right (Maybe (GenEntry TarPath LinkTarget)
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget)))
-> Maybe (GenEntry TarPath LinkTarget)
-> Either FormatError (Maybe (GenEntry TarPath LinkTarget))
forall a b. (a -> b) -> a -> b
$ GenEntry TarPath LinkTarget -> Maybe (GenEntry TarPath LinkTarget)
forall a. a -> Maybe a
Just (GenEntry TarPath LinkTarget
-> Maybe (GenEntry TarPath LinkTarget))
-> GenEntry TarPath LinkTarget
-> Maybe (GenEntry TarPath LinkTarget)
forall a b. (a -> b) -> a -> b
$ Entry {
entryTarPath :: TarPath
entryTarPath = PosixString -> PosixString -> TarPath
TarPath (ByteString -> PosixString
byteToPosixString ByteString
name) (ByteString -> PosixString
byteToPosixString ByteString
prefix),
entryContent :: GenEntryContent LinkTarget
entryContent = case Char
typecode of
Char
'\0' -> ByteString -> Int64 -> GenEntryContent LinkTarget
forall linkTarget.
ByteString -> Int64 -> GenEntryContent linkTarget
NormalFile ByteString
content Int64
size
Char
'0' -> ByteString -> Int64 -> GenEntryContent LinkTarget
forall linkTarget.
ByteString -> Int64 -> GenEntryContent linkTarget
NormalFile ByteString
content Int64
size
Char
'1' -> LinkTarget -> GenEntryContent LinkTarget
forall linkTarget. linkTarget -> GenEntryContent linkTarget
HardLink (PosixString -> LinkTarget
LinkTarget (PosixString -> LinkTarget) -> PosixString -> LinkTarget
forall a b. (a -> b) -> a -> b
$ ByteString -> PosixString
byteToPosixString ByteString
linkname)
Char
'2' -> LinkTarget -> GenEntryContent LinkTarget
forall linkTarget. linkTarget -> GenEntryContent linkTarget
SymbolicLink (PosixString -> LinkTarget
LinkTarget (PosixString -> LinkTarget) -> PosixString -> LinkTarget
forall a b. (a -> b) -> a -> b
$ ByteString -> PosixString
byteToPosixString ByteString
linkname)
Char
_ | Format
format Format -> Format -> Bool
forall a. Eq a => a -> a -> Bool
== Format
V7Format
-> Char -> ByteString -> Int64 -> GenEntryContent LinkTarget
forall linkTarget.
Char -> ByteString -> Int64 -> GenEntryContent linkTarget
OtherEntryType Char
typecode ByteString
content Int64
size
Char
'3' -> Int -> Int -> GenEntryContent LinkTarget
forall linkTarget. Int -> Int -> GenEntryContent linkTarget
CharacterDevice Int
devmajor Int
devminor
Char
'4' -> Int -> Int -> GenEntryContent LinkTarget
forall linkTarget. Int -> Int -> GenEntryContent linkTarget
BlockDevice Int
devmajor Int
devminor
Char
'5' -> GenEntryContent LinkTarget
forall linkTarget. GenEntryContent linkTarget
Directory
Char
'6' -> GenEntryContent LinkTarget
forall linkTarget. GenEntryContent linkTarget
NamedPipe
Char
'7' -> ByteString -> Int64 -> GenEntryContent LinkTarget
forall linkTarget.
ByteString -> Int64 -> GenEntryContent linkTarget
NormalFile ByteString
content Int64
size
Char
_ -> Char -> ByteString -> Int64 -> GenEntryContent LinkTarget
forall linkTarget.
Char -> ByteString -> Int64 -> GenEntryContent linkTarget
OtherEntryType Char
typecode ByteString
content Int64
size,
entryPermissions :: Permissions
entryPermissions = Permissions
mode,
entryOwnership :: Ownership
entryOwnership = String -> String -> Int -> Int -> Ownership
Ownership (ByteString -> String
BS.Char8.unpack ByteString
uname)
(ByteString -> String
BS.Char8.unpack ByteString
gname) Int
uid Int
gid,
entryTime :: Int64
entryTime = Int64
mtime,
entryFormat :: Format
entryFormat = Format
format
}
parseHeader
:: LBS.ByteString
-> Either FormatError (BS.ByteString, Permissions, Int, Int, Int64, EpochTime, Char, BS.ByteString, Format, BS.ByteString, BS.ByteString, DevMajor, DevMinor, BS.ByteString)
ByteString
header' = do
case (Either FormatError Int
chksum_, ByteString -> Either FormatError Format
format_ ByteString
magic) of
(Right Int
chksum, Either FormatError Format
_ ) | ByteString -> Int -> Bool
correctChecksum ByteString
header Int
chksum -> () -> Either FormatError ()
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
(Right Int
_, Right Format
_) -> FormatError -> Either FormatError ()
forall a b. a -> Either a b
Left FormatError
ChecksumIncorrect
(Either FormatError Int, Either FormatError Format)
_ -> FormatError -> Either FormatError ()
forall a b. a -> Either a b
Left FormatError
NotTarFormat
Permissions
mode <- Either FormatError Permissions
mode_
Int
uid <- Either FormatError Int
uid_
Int
gid <- Either FormatError Int
gid_
Int64
size <- Either FormatError Int64
size_
Int64
mtime <- Either FormatError Int64
mtime_
Format
format <- ByteString -> Either FormatError Format
format_ ByteString
magic
Int
devmajor <- Either FormatError Int
devmajor_
Int
devminor <- Either FormatError Int
devminor_
(ByteString, Permissions, Int, Int, Int64, Int64, Char, ByteString,
Format, ByteString, ByteString, Int, Int, ByteString)
-> Either
FormatError
(ByteString, Permissions, Int, Int, Int64, Int64, Char, ByteString,
Format, ByteString, ByteString, Int, Int, ByteString)
forall a. a -> Either FormatError a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (ByteString
name, Permissions
mode, Int
uid, Int
gid, Int64
size, Int64
mtime, Char
typecode, ByteString
linkname, Format
format, ByteString
uname, ByteString
gname, Int
devmajor, Int
devminor, ByteString
prefix)
where
header :: ByteString
header = ByteString -> ByteString
LBS.toStrict ByteString
header'
name :: ByteString
name = Int -> Int -> ByteString -> ByteString
getString Int
0 Int
100 ByteString
header
mode_ :: Either FormatError Permissions
mode_ = Int -> Int -> ByteString -> Either FormatError Permissions
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
100 Int
8 ByteString
header
uid_ :: Either FormatError Int
uid_ = Int -> Int -> ByteString -> Either FormatError Int
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
108 Int
8 ByteString
header
gid_ :: Either FormatError Int
gid_ = Int -> Int -> ByteString -> Either FormatError Int
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
116 Int
8 ByteString
header
size_ :: Either FormatError Int64
size_ = Int -> Int -> ByteString -> Either FormatError Int64
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
124 Int
12 ByteString
header
mtime_ :: Either FormatError Int64
mtime_ = Int -> Int -> ByteString -> Either FormatError Int64
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
136 Int
12 ByteString
header
chksum_ :: Either FormatError Int
chksum_ = Int -> Int -> ByteString -> Either FormatError Int
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
148 Int
8 ByteString
header
typecode :: Char
typecode = Int -> ByteString -> Char
getByte Int
156 ByteString
header
linkname :: ByteString
linkname = Int -> Int -> ByteString -> ByteString
getString Int
157 Int
100 ByteString
header
magic :: ByteString
magic = Int -> Int -> ByteString -> ByteString
getChars Int
257 Int
8 ByteString
header
uname :: ByteString
uname = Int -> Int -> ByteString -> ByteString
getString Int
265 Int
32 ByteString
header
gname :: ByteString
gname = Int -> Int -> ByteString -> ByteString
getString Int
297 Int
32 ByteString
header
devmajor_ :: Either FormatError Int
devmajor_ = Int -> Int -> ByteString -> Either FormatError Int
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
329 Int
8 ByteString
header
devminor_ :: Either FormatError Int
devminor_ = Int -> Int -> ByteString -> Either FormatError Int
forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
337 Int
8 ByteString
header
prefix :: ByteString
prefix = Int -> Int -> ByteString -> ByteString
getString Int
345 Int
155 ByteString
header
format_ :: BS.ByteString -> Either FormatError Format
format_ :: ByteString -> Either FormatError Format
format_ ByteString
magic
| ByteString
magic ByteString -> ByteString -> Bool
forall a. Eq a => a -> a -> Bool
== ByteString
ustarMagic = Format -> Either FormatError Format
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return Format
UstarFormat
| ByteString
magic ByteString -> ByteString -> Bool
forall a. Eq a => a -> a -> Bool
== ByteString
gnuMagic = Format -> Either FormatError Format
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return Format
GnuFormat
| ByteString
magic ByteString -> ByteString -> Bool
forall a. Eq a => a -> a -> Bool
== ByteString
v7Magic = Format -> Either FormatError Format
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return Format
V7Format
| Bool
otherwise = FormatError -> Either FormatError Format
forall a b. a -> Either a b
Left FormatError
UnrecognisedTarFormat
v7Magic, ustarMagic, gnuMagic :: BS.ByteString
v7Magic :: ByteString
v7Magic = String -> ByteString
BS.Char8.pack String
"\0\0\0\0\0\0\0\0"
ustarMagic :: ByteString
ustarMagic = String -> ByteString
BS.Char8.pack String
"ustar\NUL00"
gnuMagic :: ByteString
gnuMagic = String -> ByteString
BS.Char8.pack String
"ustar \NUL"
correctChecksum :: BS.ByteString -> Int -> Bool
correctChecksum :: ByteString -> Int -> Bool
correctChecksum ByteString
header Int
checksum = Int
checksum Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
checksum'
where
sumchars :: ByteString -> Int
sumchars = (Int -> Word8 -> Int) -> Int -> ByteString -> Int
forall a. (a -> Word8 -> a) -> a -> ByteString -> a
BS.foldl' (\Int
x Word8
y -> Int
x Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Word8 -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral Word8
y) Int
0
checksum' :: Int
checksum' = ByteString -> Int
sumchars (Int -> ByteString -> ByteString
BS.take Int
148 ByteString
header)
Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
256
Int -> Int -> Int
forall a. Num a => a -> a -> a
+ ByteString -> Int
sumchars (Int -> ByteString -> ByteString
BS.drop Int
156 ByteString
header)
{-# SPECIALISE getOct :: Int -> Int -> BS.ByteString -> Either FormatError Int #-}
{-# SPECIALISE getOct :: Int -> Int -> BS.ByteString -> Either FormatError Int64 #-}
getOct :: (Integral a, Bits a) => Int -> Int -> BS.ByteString -> Either FormatError a
getOct :: forall a.
(Integral a, Bits a) =>
Int -> Int -> ByteString -> Either FormatError a
getOct Int
off Int
len = ByteString -> Either FormatError a
forall {a}.
(Integral a, Bits a) =>
ByteString -> Either FormatError a
parseOct (ByteString -> Either FormatError a)
-> (ByteString -> ByteString) -> ByteString -> Either FormatError a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> ByteString -> ByteString
getBytes Int
off Int
len
where
parseOct :: ByteString -> Either FormatError a
parseOct ByteString
s | HasCallStack => ByteString -> Word8
ByteString -> Word8
BS.head ByteString
s Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
128 = a -> Either FormatError a
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return (ByteString -> a
forall a. (Integral a, Bits a) => ByteString -> a
readBytes (HasCallStack => ByteString -> ByteString
ByteString -> ByteString
BS.tail ByteString
s))
| HasCallStack => ByteString -> Word8
ByteString -> Word8
BS.head ByteString
s Word8 -> Word8 -> Bool
forall a. Eq a => a -> a -> Bool
== Word8
255 = a -> Either FormatError a
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return (a -> a
forall a. Num a => a -> a
negate (ByteString -> a
forall a. (Integral a, Bits a) => ByteString -> a
readBytes (HasCallStack => ByteString -> ByteString
ByteString -> ByteString
BS.tail ByteString
s)))
parseOct ByteString
s
| ByteString -> Bool
BS.null ByteString
stripped = a -> Either FormatError a
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return a
0
| Bool
otherwise = case ByteString -> Maybe a
forall n. Integral n => ByteString -> Maybe n
readOct ByteString
stripped of
Just a
x -> a -> Either FormatError a
forall a. a -> Either FormatError a
forall (m :: * -> *) a. Monad m => a -> m a
return a
x
Maybe a
Nothing -> FormatError -> Either FormatError a
forall a b. a -> Either a b
Left FormatError
HeaderBadNumericEncoding
where
stripped :: ByteString
stripped = (Char -> Bool) -> ByteString -> ByteString
BS.Char8.takeWhile (\Char
c -> Char
c Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= Char
'\NUL' Bool -> Bool -> Bool
&& Char
c Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= Char
' ')
(ByteString -> ByteString) -> ByteString -> ByteString
forall a b. (a -> b) -> a -> b
$ (Char -> Bool) -> ByteString -> ByteString
BS.Char8.dropWhile (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
' ') ByteString
s
readBytes :: (Integral a, Bits a) => BS.ByteString -> a
readBytes :: forall a. (Integral a, Bits a) => ByteString -> a
readBytes = (a -> Word8 -> a) -> a -> ByteString -> a
forall a. (a -> Word8 -> a) -> a -> ByteString -> a
BS.foldl' (\a
acc Word8
x -> a
acc a -> Int -> a
forall a. Bits a => a -> Int -> a
`shiftL` Int
8 a -> a -> a
forall a. Num a => a -> a -> a
+ Word8 -> a
forall a b. (Integral a, Num b) => a -> b
fromIntegral Word8
x) a
0
getBytes :: Int -> Int -> BS.ByteString -> BS.ByteString
getBytes :: Int -> Int -> ByteString -> ByteString
getBytes Int
off Int
len = Int -> ByteString -> ByteString
BS.take Int
len (ByteString -> ByteString)
-> (ByteString -> ByteString) -> ByteString -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> ByteString -> ByteString
BS.drop Int
off
getByte :: Int -> BS.ByteString -> Char
getByte :: Int -> ByteString -> Char
getByte Int
off ByteString
bs = ByteString -> Int -> Char
BS.Char8.index ByteString
bs Int
off
getChars :: Int -> Int -> BS.ByteString -> BS.ByteString
getChars :: Int -> Int -> ByteString -> ByteString
getChars = Int -> Int -> ByteString -> ByteString
getBytes
getString :: Int -> Int -> BS.ByteString -> BS.ByteString
getString :: Int -> Int -> ByteString -> ByteString
getString Int
off Int
len = ByteString -> ByteString
BS.copy (ByteString -> ByteString)
-> (ByteString -> ByteString) -> ByteString -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (Char -> Bool) -> ByteString -> ByteString
BS.Char8.takeWhile (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/=Char
'\0') (ByteString -> ByteString)
-> (ByteString -> ByteString) -> ByteString -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Int -> Int -> ByteString -> ByteString
getBytes Int
off Int
len
{-# SPECIALISE readOct :: BS.ByteString -> Maybe Int #-}
{-# SPECIALISE readOct :: BS.ByteString -> Maybe Int64 #-}
readOct :: Integral n => BS.ByteString -> Maybe n
readOct :: forall n. Integral n => ByteString -> Maybe n
readOct = Int -> n -> ByteString -> Maybe n
forall n. Integral n => Int -> n -> ByteString -> Maybe n
go Int
0 n
0
where
go :: Integral n => Int -> n -> BS.ByteString -> Maybe n
go :: forall n. Integral n => Int -> n -> ByteString -> Maybe n
go !Int
i !n
n !ByteString
bs = case ByteString -> Maybe (Word8, ByteString)
BS.uncons ByteString
bs of
Maybe (Word8, ByteString)
Nothing -> if Int
i Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
0 then Maybe n
forall a. Maybe a
Nothing else n -> Maybe n
forall a. a -> Maybe a
Just n
n
Just (Word8
w, ByteString
tl)
| Word8
w Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
>= Word8
0x30 Bool -> Bool -> Bool
&& Word8
w Word8 -> Word8 -> Bool
forall a. Ord a => a -> a -> Bool
<= Word8
0x39 ->
Int -> n -> ByteString -> Maybe n
forall n. Integral n => Int -> n -> ByteString -> Maybe n
go (Int
iInt -> Int -> Int
forall a. Num a => a -> a -> a
+Int
1) (n
n n -> n -> n
forall a. Num a => a -> a -> a
* n
8 n -> n -> n
forall a. Num a => a -> a -> a
+ (Word8 -> n
forall a b. (Integral a, Num b) => a -> b
fromIntegral Word8
w n -> n -> n
forall a. Num a => a -> a -> a
- n
0x30)) ByteString
tl
| Bool
otherwise -> Maybe n
forall a. Maybe a
Nothing