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# Copyright (C) 2012-2023 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 .. import fileutil, util
import lzma
READ_SIZE_BYTES = 1024 * 1024
# Adapters for different lzma bindings.
if hasattr(lzma, 'FORMAT_ALONE'):
def _get_lzma_options(format):
return {
'format': {
'alone': lzma.FORMAT_ALONE,
'xz': lzma.FORMAT_XZ,
}[format]
}
else:
# might not be available e.g. in Debian's python-lzma 0.5.3
# which is pyliblzma.
def _get_lzma_options(format):
return {'options': {'format': format}}
def _extract(archive, compression, cmd, format, verbosity, outdir):
"""Extract an LZMA or XZ archive with the lzma Python module."""
targetname = fileutil.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 = f"error extracting {archive} to {targetname}"
raise util.PatoolError(msg) from err
return
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)) 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:
raise util.PatoolError(f"error creating {archive}") from err
return
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)
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