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{-# OPTIONS -fallow-overlapping-instances #-}
{- arch-tag: BZip2 files
Copyright (C) 2005 John Goerzen <jgoerzen@complete.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : MissingPy.FileArchive.BZip2
Copyright : Copyright (C) 2005 John Goerzen
License : GNU GPL, version 2 or above
Maintainer : John Goerzen,
Maintainer : jgoerzen\@complete.org
Stability : provisional
Portability: portable
Support for BZip2 files
Written by John Goerzen, jgoerzen\@complete.org
-}
module MissingPy.FileArchive.BZip2 (openBz2)
where
import Python.Types
import Python.Utils
import Python.Objects
import Python.Interpreter
import System.IO
import System.IO.Error
import Python.Exceptions
import System.IO.HVIO
import Foreign.C.Types
import Python.Objects.File
{- |Open a BZip2 file. The compression level should be from 1
(least compression) to 9 (most compression). This is ignored when the file
is opened read-only.
Once opened, the functions defined in "System.IO.HVIO" can be used
to work with it.
BZip2 supports only ReadMode and WriteMode for the IOMode. -}
openBz2 :: FilePath -- ^ File to open
-> IOMode -- ^ Mode to open with
-> Int -- ^ Compression Level
-> IO PyFile -- ^ Resulting handle
openBz2 _ ReadWriteMode _ = fail "BZip2 doesn't support ReadWriteMode"
openBz2 _ AppendMode _ = fail "BZip2 doesn't support AppendMode"
openBz2 fp mode level =
do ofp <- toPyObject fp
omode <- toPyObject (openModeConv mode)
obuffering <- toPyObject (0::CLong)
ocl <- toPyObject ((fromIntegral level)::CLong)
pyImport "bz2"
obj <- callByName "bz2.BZ2File" [ofp, omode, obuffering, ocl] []
return $ mkPyFile obj
|
