Source code for daklib.compress

# Copyright (C) 2015, Ansgar Burchardt <>
# 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 2 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
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Helper methods to deal with (de)compressing files

import os
import shutil
import subprocess
from typing import IO, Optional

[docs]def decompress_zstd(input: IO, output: IO) -> None: subprocess.check_call(["zstd", "--decompress"], stdin=input, stdout=output)
[docs]def decompress_xz(input: IO, output: IO) -> None: subprocess.check_call(["xz", "--decompress", "-T0"], stdin=input, stdout=output)
[docs]def decompress_bz2(input: IO, output: IO) -> None: subprocess.check_call(["bzip2", "--decompress"], stdin=input, stdout=output)
[docs]def decompress_gz(input: IO, output: IO) -> None: subprocess.check_call(["gzip", "--decompress"], stdin=input, stdout=output)
decompressors = { '.zst': decompress_zstd, '.xz': decompress_xz, '.bz2': decompress_bz2, '.gz': decompress_gz, }
[docs]def decompress(input: IO, output: IO, filename: Optional[str] = None) -> None: if filename is None: filename = base, ext = os.path.splitext(filename) decompressor = decompressors.get(ext, None) if decompressor is not None: decompressor(input, output) else: shutil.copyfileobj(input, output)