/usr/lib/python3/dist-packages/diffoscope/comparators/utils/specialize.py is in diffoscope 93ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | # -*- coding: utf-8 -*-
#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2016 Chris Lamb <lamby@debian.org>
#
# diffoscope 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.
#
# diffoscope 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 diffoscope. If not, see <https://www.gnu.org/licenses/>.
import logging
from diffoscope.profiling import profile
from .. import ComparatorManager
logger = logging.getLogger(__name__)
def try_recognize(file, cls, recognizes):
if isinstance(file, cls):
return True
# Does this file class match?
with profile('recognizes', file):
# logger.debug("trying %s on %s", cls, file)
if not recognizes(file):
return False
# Found a match; perform type magic
logger.debug("Using %s for %s", cls.__name__, file.name)
new_cls = type(cls.__name__, (cls, type(file)), {})
file.__class__ = new_cls
return True
def specialize(file):
for cls in ComparatorManager().classes:
if try_recognize(file, cls, cls.recognizes):
return file
for cls in ComparatorManager().classes:
if try_recognize(file, cls, cls.fallback_recognizes):
logger.debug("File recognized by fallback. Magic says: %s", file.magic_file_type)
return file
logger.debug(
"File not identified by any comparator. Magic says: %s",
file.magic_file_type,
)
return file
def is_direct_instance(file, cls):
# is_direct_instance(<GzipFile>, GzipFile) == True, but
# is_direct_instance(<IpkFile>, GzipFile) == False
if not isinstance(file, cls):
return False
for c in ComparatorManager().classes:
if c is not cls and isinstance(file, c):
return False
return True
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