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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-04-07 04:02
__init__.py	14.17 KB	-rw-r--r--	2026-03-29 11:46
archive.py	11.77 KB	-rw-r--r--	2026-03-29 11:46
archiver.py	247.53 KB	-rw-r--r--	2026-03-29 11:46
attic.tar.gz	2.76 KB	-rw-r--r--	2026-03-29 11:46
benchmark.py	2.87 KB	-rw-r--r--	2026-03-29 11:46
cache.py	9.04 KB	-rw-r--r--	2026-03-29 11:46
checksums.py	1.68 KB	-rw-r--r--	2026-03-29 11:46
chunker.py	6.08 KB	-rw-r--r--	2026-03-29 11:46
chunker_pytest.py	5.29 KB	-rw-r--r--	2026-03-29 11:46
chunker_slow.py	1.5 KB	-rw-r--r--	2026-03-29 11:46
compress.py	8.72 KB	-rw-r--r--	2026-03-29 11:46
crypto.py	6.65 KB	-rw-r--r--	2026-03-29 11:46
efficient_collection_queue.py	1.57 KB	-rw-r--r--	2026-03-29 11:46
file_integrity.py	6.15 KB	-rw-r--r--	2026-03-29 11:46
hashindex.py	20.17 KB	-rw-r--r--	2026-03-29 11:46
hashindex_stress.py	1.14 KB	-rw-r--r--	2026-03-29 11:46
helpers.py	49.67 KB	-rw-r--r--	2026-03-29 11:46
item.py	4.48 KB	-rw-r--r--	2026-03-29 11:46
key.py	19.72 KB	-rw-r--r--	2026-03-29 11:46
locking.py	13.4 KB	-rw-r--r--	2026-03-29 11:46
logger.py	1.54 KB	-rw-r--r--	2026-03-29 11:46
lrucache.py	1.4 KB	-rw-r--r--	2026-03-29 11:46
nanorst.py	1008 B	-rw-r--r--	2026-03-29 11:46
nonces.py	7.02 KB	-rw-r--r--	2026-03-29 11:46
patterns.py	16.96 KB	-rw-r--r--	2026-03-29 11:46
platform.py	8.52 KB	-rw-r--r--	2026-03-29 11:46
remote.py	6.28 KB	-rw-r--r--	2026-03-29 11:46
repository.py	47.31 KB	-rw-r--r--	2026-03-29 11:46
shellpattern.py	3.09 KB	-rw-r--r--	2026-03-29 11:46
upgrader.py	6.74 KB	-rw-r--r--	2026-03-29 11:46
version.py	1.76 KB	-rw-r--r--	2026-03-29 11:46
xattr.py	3.28 KB	-rw-r--r--	2026-03-29 11:46

Rename

from hashlib import sha256
from io import BytesIO
from binascii import unhexlify

from .chunker import cf
from ..chunker import Chunker
from ..constants import *  # NOQA
from . import BaseTestCase

def H(data):
    return sha256(data).digest()

class ChunkerRegressionTestCase(BaseTestCase):

def test_chunkpoints_unchanged(self):
        def twist(size):
            x = 1
            a = bytearray(size)
            for i in range(size):
                x = (x * 1103515245 + 12345) & 0x7FFFFFFF
                a[i] = x & 0xFF
            return a

data = twist(100000)

runs = []
        for winsize in (65, 129, HASH_WINDOW_SIZE, 7351):
            for minexp in (4, 6, 7, 11, 12):
                for maxexp in (15, 17):
                    if minexp >= maxexp:
                        continue
                    for maskbits in (4, 7, 10, 12):
                        for seed in (1849058162, 1234567653):
                            fh = BytesIO(data)
                            chunker = Chunker(seed, minexp, maxexp, maskbits, winsize)
                            chunks = [H(c) for c in cf(chunker.chunkify(fh, -1))]
                            runs.append(H(b''.join(chunks)))

# The "correct" hash below matches the existing chunker behavior.
        # Future chunker optimisations must not change this, or existing repos will bloat.
        overall_hash = H(b''.join(runs))
        self.assert_equal(overall_hash, unhexlify("a43d0ecb3ae24f38852fcc433a83dacd28fe0748d09cc73fc11b69cf3f1a7299"))