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ATS-Pを復調したバイナリファイルから、ビットアラインメントがずれていてもCRCの正しい電文を取り出す
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import bitstring | |
import collections | |
from crccheck.crc import Crc16Genibus | |
import re | |
f = open("../result_r_y_yg_nobori2-3.bin", "rb").read() | |
b = bitstring.BitArray(bytes=f) | |
r = re.compile('0x(7e.+7e)$') | |
def check(b): | |
l = [] | |
for i in b.findall("0x7E"): | |
try: | |
for x in b.cut(80, i, i+80): | |
result = r.match(str(x)) | |
if result is not None: | |
result = result.group()[2:] | |
l.append(result) | |
except ValueError: | |
pass | |
return l | |
s = check(b) | |
ranking = collections.Counter(s).most_common() | |
print("CRC合格した場合は表示されます") | |
print() | |
for bits, cnt in ranking: | |
crc_expect = bits[-6:-2] | |
data = bytearray.fromhex(bits[2:-6]) | |
h = Crc16Genibus().calc(data) | |
crc_actual = f'{h:x}'.zfill(4) | |
if crc_expect == crc_actual: | |
print("-----CRC合格-----") | |
print("出現回数: ", cnt) | |
print("内容: ", bits[2:-6]) | |
print("CRC部分: ", bits[-6:-2]) | |
print("----------") |
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