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ENH: support pyliblzma bindings for Python2 which has no lzma built-in

This commit is contained in:
Yaroslav Halchenko 2018-09-11 11:28:37 -04:00
parent 087cd9ee33
commit 3a5d6cbfa9
1 changed files with 34 additions and 6 deletions
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40
patoolib/programs/py_lzma.py
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@ -14,16 +14,44 @@
# 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, format=format) as lzmafile:
with lzma.LZMAFile(archive, **_get_lzma_options(format)) as lzmafile:
with open(targetname, 'wb') as targetfile:
data = lzmafile.read(READ_SIZE_BYTES)
while data:
@ -36,11 +64,11 @@ def _extract(archive, compression, cmd, format, verbosity, outdir):
def extract_lzma(archive, compression, cmd, verbosity, interactive, outdir):
"""Extract an LZMA archive with the lzma Python module."""
return _extract(archive, compression, cmd, lzma.FORMAT_ALONE, verbosity, outdir)
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, lzma.FORMAT_XZ, verbosity, outdir)
return _extract(archive, compression, cmd, 'xz', verbosity, outdir)
def _create(archive, compression, cmd, format, verbosity, filenames):
@ -48,7 +76,7 @@ def _create(archive, compression, cmd, format, verbosity, filenames):
if len(filenames) > 1:
raise util.PatoolError('multi-file compression not supported in Python lzma')
try:
with lzma.LZMAFile(archive, mode='wb', format=format, preset=9) as lzmafile:
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)
@ -62,8 +90,8 @@ def _create(archive, compression, cmd, format, verbosity, filenames):
def create_lzma(archive, compression, cmd, verbosity, interactive, filenames):
"""Create an LZMA archive with the lzma Python module."""
return _create(archive, compression, cmd, lzma.FORMAT_ALONE, verbosity, filenames)
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, lzma.FORMAT_XZ, verbosity, filenames)
return _create(archive, compression, cmd, 'xz', verbosity, filenames)