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#!/usr/bin/env python3 |
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"""This module is used to operate with 7Z archives.""" |
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import os # filesystem read |
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import subprocess # invocation of 7z |
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from bbarchivist import decorators # timer |
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from bbarchivist import utilities # platform determination |
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__author__ = "Thurask" |
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__license__ = "WTFPL v2" |
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__copyright__ = "2018 Thurask" |
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def szcodes(): |
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""" |
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Return dictionary of 7-Zip error codes. |
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""" |
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szc = { |
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0: "NO ERRORS", |
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1: "COMPLETED WITH WARNINGS", |
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2: "FATAL ERROR", |
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7: "COMMAND LINE ERROR", |
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8: "OUT OF MEMORY ERROR", |
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255: "USER STOPPED PROCESS" |
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} |
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return szc |
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@decorators.timer |
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def sz_compress(filepath, filename, szexe=None, strength=5, errors=False): |
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""" |
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Pack a file into a LZMA2 7z file. |
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:param filepath: Basename of file, no extension. |
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:type filepath: str |
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:param filename: Name of file to pack. |
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:type filename: str |
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:param szexe: Path to 7z executable. |
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:type szexe: str |
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:param strength: Compression strength. 5 is normal, 9 is ultra. |
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:type strength: int |
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:param errors: Print completion status message. Default is false. |
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:type errors: bool |
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""" |
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strength = str(strength) |
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szc = szcodes() |
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rawname = os.path.dirname(filepath) |
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thr = str(utilities.get_core_count()) |
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fold = os.path.join(rawname, filename) |
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cmd = '{0} a -mx{1} -m0=lzma2 -mmt{2} "{3}.7z" "{4}"'.format(szexe, strength, thr, filepath, fold) |
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excode = sz_subprocess(cmd) |
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if errors: |
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print(szc[excode]) |
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def sz_subprocess(cmd): |
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""" |
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Subprocess wrapper for 7-Zip commands. |
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:param cmd: Command to pass to subprocess. |
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:type cmd: str |
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""" |
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with open(os.devnull, 'wb') as dnull: |
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output = subprocess.call(cmd, stdout=dnull, stderr=subprocess.STDOUT, shell=True) |
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return output |
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def sz_verify(filepath, szexe=None): |
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""" |
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Verify that a .7z file is valid and working. |
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:param filepath: Filename. |
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:type filepath: str |
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:param szexe: Path to 7z executable. |
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:type szexe: str |
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""" |
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filepath = os.path.abspath(filepath) |
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cmd = '{0} t "{1}"'.format(szexe, filepath) |
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excode = sz_subprocess(cmd) |
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return excode == 0 |
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def pack_tclloader_sz(dirname, filename, strength=5): |
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""" |
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Compress Android autoloader folder into a 7z file. |
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:param dirname: Target folder. |
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:type dirname: str |
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:param filename: File title, without extension. |
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:type filename: str |
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:param strength: Compression strength. 5 is normal, 9 is ultra. |
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:type strength: int |
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""" |
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szexe = utilities.get_seven_zip() |
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thr = str(utilities.get_core_count()) |
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cmd = '{0} a -mx{1} -m0=lzma2 -mmt{2} "{3}.7z" "./{4}/*"'.format(szexe, strength, thr, filename, dirname) |
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sz_subprocess(cmd) |
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thurask /
bbarchivist
