98 lines
3.8 KiB
Python
98 lines
3.8 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 lzma Python module."""
|
|
|
|
from __future__ import absolute_import
|
|
|
|
from .. import util
|
|
import lzma
|
|
|
|
READ_SIZE_BYTES = 1024*1024
|
|
|
|
# Adapters for different lzma bindings.
|
|
if hasattr(lzma, 'FORMAT_ALONE'):
|
|
def _get_lzma_options(format, preset=None):
|
|
kwargs = {'format':
|
|
{'alone': lzma.FORMAT_ALONE,
|
|
'xz': lzma.FORMAT_XZ,
|
|
}[format]
|
|
}
|
|
if preset:
|
|
kwargs['preset'] = preset
|
|
return kwargs
|
|
else:
|
|
# might not be available e.g. in Debian's python-lzma 0.5.3
|
|
# which is pyliblzma.
|
|
def _get_lzma_options(format, preset=None):
|
|
kwargs = {
|
|
'options': {
|
|
'format': format
|
|
}
|
|
}
|
|
if preset:
|
|
kwargs['options']['level'] = preset
|
|
return kwargs
|
|
|
|
|
|
def _extract(archive, compression, cmd, format, verbosity, outdir):
|
|
"""Extract an LZMA or XZ archive with the lzma Python module."""
|
|
targetname = util.get_single_outfile(outdir, archive)
|
|
try:
|
|
with lzma.LZMAFile(archive, **_get_lzma_options(format)) as lzmafile:
|
|
with open(targetname, 'wb') as targetfile:
|
|
data = lzmafile.read(READ_SIZE_BYTES)
|
|
while data:
|
|
targetfile.write(data)
|
|
data = lzmafile.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 extract_lzma(archive, compression, cmd, verbosity, interactive, outdir):
|
|
"""Extract an LZMA archive with the lzma Python module."""
|
|
return _extract(archive, compression, cmd, 'alone', verbosity, outdir)
|
|
|
|
def extract_xz(archive, compression, cmd, verbosity, interactive, outdir):
|
|
"""Extract an XZ archive with the lzma Python module."""
|
|
return _extract(archive, compression, cmd, 'xz', verbosity, outdir)
|
|
|
|
|
|
def _create(archive, compression, cmd, format, verbosity, filenames):
|
|
"""Create an LZMA or XZ archive with the lzma Python module."""
|
|
if len(filenames) > 1:
|
|
raise util.PatoolError('multi-file compression not supported in Python lzma')
|
|
try:
|
|
with lzma.LZMAFile(archive, mode='wb', **_get_lzma_options(format, preset=9)) as lzmafile:
|
|
filename = filenames[0]
|
|
with open(filename, 'rb') as srcfile:
|
|
data = srcfile.read(READ_SIZE_BYTES)
|
|
while data:
|
|
lzmafile.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
|
|
|
|
def create_lzma(archive, compression, cmd, verbosity, interactive, filenames):
|
|
"""Create an LZMA archive with the lzma Python module."""
|
|
return _create(archive, compression, cmd, 'alone', verbosity, filenames)
|
|
|
|
def create_xz(archive, compression, cmd, verbosity, interactive, filenames):
|
|
"""Create an XZ archive with the lzma Python module."""
|
|
return _create(archive, compression, cmd, 'xz', verbosity, filenames)
|