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
|
#!/usr/bin/env python3
import logging
from pycrc.models import CrcModels
from pycrc.algorithms import Crc
LOGGER = logging.getLogger(__name__)
def check_crc(algo, check_str, expected_crc=None):
res_bbb = algo.bit_by_bit(check_str)
res_bbf = algo.bit_by_bit_fast(check_str)
res_tbl = algo.table_driven(check_str)
LOGGER.info(f"Crc(width={algo.width:#x}, poly={algo.poly:#x}, "
f"reflect_in={algo.reflect_in:#x}, xor_in={algo.xor_in:#x}, "
f"reflect_out={algo.reflect_out:#x}, xor_out={algo.xor_out:#x}), "
f"expected_crc={expected_crc}, "
f"bbb={res_bbb:#x}, bbf={res_bbf:#x}, tbl={res_tbl:#x}")
if expected_crc is not None:
assert res_bbb == res_bbf == res_tbl == expected_crc
assert res_bbb == res_bbf == res_tbl
def test_all_models_with_check_input():
"""
Test all models using the basic check sequence.
"""
check_str = '123456789'
for m in CrcModels().models:
algo = Crc(width=m['width'], poly=m['poly'],
reflect_in=m['reflect_in'], xor_in=m['xor_in'],
reflect_out=m['reflect_out'], xor_out=m['xor_out'])
check_crc(algo, check_str, m['check'])
def test_all_models_with_cornercase_input():
"""
Use corner case input strings
"""
for m in CrcModels().models:
algo = Crc(width=m['width'], poly=m['poly'],
reflect_in=m['reflect_in'], xor_in=m['xor_in'],
reflect_out=m['reflect_out'], xor_out=m['xor_out'])
for check_str in "", b"", b"\0", b"\1", b"\0\0\0\0", b"\xff":
check_crc(algo, check_str)
def test_other_models():
"""
Test random parameters.
"""
check_str = '123456789'
for width in [5, 8, 16, 32, 65, 513]:
mask = ((1 << width) - 1)
for poly in [0x8005, 0x4c11db7, 0xa5a5a5a5]:
poly &= mask
for reflect_in in [0, 1]:
for reflect_out in [0, 1]:
for xor_in in [0x0, 0x1, 0x5a5a5a5a]:
xor_in &= mask
for xor_out in [0x0, 0x1, 0x5a5a5a5a]:
xor_out &= mask
algo = Crc(width=width, poly=poly,
reflect_in=reflect_in, xor_in=xor_in,
reflect_out=reflect_out, xor_out=xor_out)
check_crc(algo, check_str)
|
