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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.
Raises ImportError when neither compression.zstd nor pyzst module is found.
"""
from .. import fileutil, util, log
# try importing a python zstd module
try:
from compression import zstd
except ImportError:
import pyzstd as zstd # ty: ignore[unresolved-import]
READ_SIZE_BYTES = 1024 * 1024
def extract_zstd(archive, compression, cmd, verbosity, interactive, outdir):
"""Extract a ZSTD archive with the zstd Python module."""
targetname = fileutil.get_single_outfile(outdir, archive)
try:
with zstd.ZstdFile(archive) as zstdfile:
with open(targetname, 'wb') as targetfile:
if verbosity >= 1:
log.log_info(f"extracting ZstdFile({archive}) to {targetname}")
data = zstdfile.read(READ_SIZE_BYTES)
while data:
targetfile.write(data)
data = zstdfile.read(READ_SIZE_BYTES)
except Exception as err:
msg = f"error extracting {archive} to {targetname}"
raise util.PatoolError(msg) from err
return
def create_zstd(archive, compression, cmd, verbosity, interactive, filenames):
"""Create a ZSTD archive with the zstd Python module."""
if len(filenames) > 1:
raise util.PatoolError('multi-file compression not supported in Python zstd')
try:
with zstd.ZstdFile(archive, mode='wb') as zstdfile:
filename = filenames[0]
with open(filename, 'rb') as srcfile:
if verbosity >= 1:
log.log_info("compressing {filename} to ZstdFile({archive})")
data = srcfile.read(READ_SIZE_BYTES)
while data:
zstdfile.write(data)
data = srcfile.read(READ_SIZE_BYTES)
except Exception as err:
raise util.PatoolError(f"error creating {archive}") from err
return
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