/usr/lib/python3/dist-packages/diffoscope/comparators/utils/fuzzy.py is in diffoscope 93ubuntu1.
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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 | # -*- coding: utf-8 -*-
#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2014-2015 Jérémy Bobbio <lunar@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
import operator
from diffoscope.config import Config
try:
import tlsh
except ImportError: # noqa
tlsh = None
logger = logging.getLogger(__name__)
def perform_fuzzy_matching(members1, members2):
if tlsh is None or Config().fuzzy_threshold == 0:
return
already_compared = set()
# Perform local copies because they will be modified by consumer
members1 = dict(members1)
members2 = dict(members2)
for name1, (file1, _) in members1.items():
if file1.is_directory() or not file1.fuzzy_hash:
continue
comparisons = []
for name2, (file2, _) in members2.items():
if name2 in already_compared or file2.is_directory() or not file2.fuzzy_hash:
continue
comparisons.append((tlsh.diff(file1.fuzzy_hash, file2.fuzzy_hash), name2))
if comparisons:
comparisons.sort(key=operator.itemgetter(0))
score, name2 = comparisons[0]
logger.debug('fuzzy top match %s %s: %d difference score', name1, name2, score)
if score < Config().fuzzy_threshold:
yield name1, name2, score
already_compared.add(name2)
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