patool/patoolib/programs/py_bz2.py

59 lines
2.2 KiB
Python

# -*- coding: utf-8 -*-
# Copyright (C) 2012-2015 Bastian Kleineidam
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
"""Archive commands for the bz2 Python module."""
from .. import util
try:
# try external bz2file module with multi-stream support
import bz2file as bz2
except ImportError:
import bz2
# read in 1MB chunks
READ_SIZE_BYTES = 1024*1024
def extract_bzip2 (archive, compression, cmd, verbosity, outdir):
"""Extract a BZIP2 archive with the bz2 Python module."""
targetname = util.get_single_outfile(outdir, archive)
try:
with bz2.BZ2File(archive) as bz2file:
with open(targetname, 'wb') as targetfile:
data = bz2file.read(READ_SIZE_BYTES)
while data:
targetfile.write(data)
data = bz2file.read(READ_SIZE_BYTES)
except Exception as err:
msg = "error extracting %s to %s: %s" % (archive, targetname, err)
raise util.PatoolError(msg)
return None
def create_bzip2 (archive, compression, cmd, verbosity, filenames):
"""Create a BZIP2 archive with the bz2 Python module."""
if len(filenames) > 1:
raise util.PatoolError('multi-file compression not supported in Python bz2')
try:
with bz2.BZ2File(archive, 'wb') as bz2file:
filename = filenames[0]
with open(filename, 'rb') as srcfile:
data = srcfile.read(READ_SIZE_BYTES)
while data:
bz2file.write(data)
data = srcfile.read(READ_SIZE_BYTES)
except Exception as err:
msg = "error creating %s: %s" % (archive, err)
raise util.PatoolError(msg)
return None