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First solution in Uncategorized category for Bit Message by _Chico_
from io import StringIO
mnames = dict(list(zip(list(range(1,13)),
('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))))
def checkio(data):
msg = StringIO(data)
msgtype = int(msg.read(2))
is8bit = bool(msgtype & 4)
is16bit = bool(msgtype & 8)
is7bit = not is8bit and not is16bit
tstamp = msg.read(12)[::-1]
S, M, H, d, m, y = (tstamp[i:i+2] for i in range(0, 12, 2))
y = '19%s' % y if int(y) > 69 else '20%s' % y
tz1 = int(msg.read(1), 16)
tz2 = int(msg.read(1), 16)
if tz2 & 8:
tz2 &= 7
sign = -1
else:
sign = 1
tz = sign * (tz1 + tz2 * 10) * 15 / 60
tstamp = '%02s %s %02s %02s:%02s:%02s GMT %+d' % (d, mnames[int(m)], y,
H, M, S, tz)
length = int(msg.read(2), 16)
buf = StringIO()
save = octs_read = 0
while buf.tell() < length:
if is16bit:
cp = int(msg.read(4), 16)
else:
cp = int(msg.read(2), 16)
if is7bit:
k = octs_read % 7
save_ = cp >> 7 - k
cp = ((cp & (2 ** (7 - k) - 1)) << k) + save
octs_read += 1
save = save_
buf.write(chr(cp))
if is7bit and k == 6 and buf.tell() < length:
buf.write(chr(save))
save = 0
decoded_msg = buf.getvalue()
buf.close()
return [tstamp, length, decoded_msg]
June 6, 2021
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