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from __future__ import unicode_literals
#
# Copyright 2005,2007,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
from gnuradio import gru
from . import digital_python as digital
import struct
def gen_and_append_crc32(s):
crc = digital.crc32(s)
return s + struct.pack(">I", gru.hexint(crc) & 0xFFFFFFFF)
def check_crc32(s):
if len(s) < 4:
return (False, '')
msg = s[:-4]
#print "msg = '%s'" % (msg,)
actual = digital.crc32(msg)
(expected,) = struct.unpack(">I", s[-4:])
# print "actual =", hex(actual), "expected =", hex(expected)
return (actual == expected, msg)
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