70 lines
3.0 KiB
Python
70 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2012-2013 Bastian Kleineidam
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""Archive commands for the lzma Python module."""
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from .. import util
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import lzma
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READ_SIZE_BYTES = 1024*1024
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def _extract(archive, compression, cmd, format, verbosity, outdir):
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"""Extract an LZMA or XZ archive with the lzma Python module."""
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targetname = util.get_single_outfile(outdir, archive)
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try:
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with lzma.LZMAFile(archive, format=format) as lzmafile:
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with open(targetname, 'wb') as targetfile:
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data = lzmafile.read(READ_SIZE_BYTES)
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while data:
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targetfile.write(data)
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data = lzmafile.read(READ_SIZE_BYTES)
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except Exception as err:
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msg = "error extracting %s to %s: %s" % (archive, targetname, err)
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raise util.PatoolError(msg)
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return None
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def extract_lzma(archive, compression, cmd, verbosity, outdir):
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"""Extract an LZMA archive with the lzma Python module."""
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return _extract(archive, compression, cmd, lzma.FORMAT_ALONE, verbosity, outdir)
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def extract_xz(archive, compression, cmd, verbosity, outdir):
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"""Extract an XZ archive with the lzma Python module."""
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return _extract(archive, compression, cmd, lzma.FORMAT_XZ, verbosity, outdir)
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def _create(archive, compression, cmd, format, verbosity, filenames):
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"""Create an LZMA or XZ archive with the lzma Python module."""
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if len(filenames) > 1:
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raise util.PatoolError('multi-file compression not supported in Python lzma')
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try:
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with lzma.LZMAFile(archive, 'wb', format) as lzmafile:
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filename = filenames[0]
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with open(filename, 'rb') as srcfile:
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data = srcfile.read(READ_SIZE_BYTES)
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while data:
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lzmafile.write(data)
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data = srcfile.read(READ_SIZE_BYTES)
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except Exception as err:
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msg = "error creating %s: %s" % (archive, err)
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raise util.PatoolError(msg)
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return None
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def create_lzma(archive, compression, cmd, verbosity, filenames):
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"""Create an LZMA archive with the lzma Python module."""
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return _create(archive, compression, cmd, lzma.FORMAT_ALONE, verbosity, filenames)
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def create_xz(archive, compression, cmd, verbosity, filenames):
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"""Create an XZ archive with the lzma Python module."""
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return _create(archive, compression, cmd, lzma.FORMAT_XZ, verbosity, filenames)
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