def unpack(self, packet):
"""
Checks the CRC and unpacks the header and payload.
Header and payload fields are unpacked into the class variables.
Returns True if unpacking is successful, False if there are any
errors or the CRC check fails
"""
(crc_ok, checked_pkt) = gru.check_crc32(packet)
if not crc_ok:
if self.verbose:
print "CRC check failed."
return False
hdr_len = self.unpack_header(checked_pkt)
self.payload = checked_pkt[hdr_len:]
return True
def unmake_packet(whitened_payload_with_footer, whitener_offset=0, dewhitening=1):
"""
Return (ok, payload)
@param whitened_payload_with_footer: string
@param whitener_offset offset into whitener string to use [0-16)
@param dewhitening: Turn whitener on or off
@type dewhitening: bool
"""
if dewhitening:
payload_with_footer = dewhiten(whitened_payload_with_footer[:-flex.CODED_OFDM_FOOTERLEN_BYTES], whitener_offset) + whitened_payload_with_footer[-flex.CODED_OFDM_FOOTERLEN_BYTES:]
else:
payload_with_footer = whitened_payload_with_footer
# TODO: check if CRC works, why -1?
ok, payload = gru.check_crc32(payload_with_footer[:-1]) # strip off tail + pad
return ok, payload_with_footer
def unmake_packet(whitened_payload_with_crc, whitener_offset=0, dewhitening=True):
"""
Return (ok, payload)
@param whitened_payload_with_crc: string
"""
if dewhitening:
payload_with_crc = dewhiten(whitened_payload_with_crc, whitener_offset)
else:
payload_with_crc = (whitened_payload_with_crc)
ok, payload = gru.check_crc32(payload_with_crc)
if 0:
print "payload_with_crc =", string_to_hex_list(payload_with_crc)
print "ok = %r, len(payload) = %d" % (ok, len(payload))
print "payload =", string_to_hex_list(payload)
return ok, payload
def unmake_packet(whitened_payload_with_crc, whitener_offset=0, dewhitening=True):
"""
Return (ok, payload)
@param whitened_payload_with_crc: string
"""
if dewhitening:
payload_with_crc = dewhiten(whitened_payload_with_crc, whitener_offset)
else:
payload_with_crc = (whitened_payload_with_crc)
ok, payload = gru.check_crc32(payload_with_crc)
if 0:
print "payload_with_crc =", string_to_hex_list(payload_with_crc)
print "ok = %r, len(payload) = %d" % (ok, len(payload))
print "payload =", string_to_hex_list(payload)
return ok, payload
def unmake_packet(whitened_payload_with_crc, whitener_offset=0, dewhitening=1):
"""
Return (ok, payload)
@param whitened_payload_with_crc: string
@param whitener_offset offset into whitener string to use [0-16)
@param dewhitening: Turn whitener on or off
@type dewhitening: bool
"""
if dewhitening:
payload_with_crc = dewhiten(whitened_payload_with_crc, whitener_offset)
else:
payload_with_crc = whitened_payload_with_crc
ok, payload = gru.check_crc32(payload_with_crc)
#if 0:
# print "payload_with_crc =", string_to_hex_list(payload_with_crc)
# print "ok = %r, len(payload) = %d" % (ok, len(payload))
# print "payload =", string_to_hex_list(payload)
return ok, payload
def unmake_packet(whitened_payload_with_crc, whitener_offset=0, dewhitening=1):
"""
Return (ok, payload)
@param whitened_payload_with_crc: string
@param whitener_offset offset into whitener string to use [0-16)
@param dewhitening: Turn whitener on or off
@type dewhitening: bool
"""
if dewhitening:
payload_with_crc = dewhiten(whitened_payload_with_crc, whitener_offset)
else:
payload_with_crc = whitened_payload_with_crc
ok, payload = gru.check_crc32(payload_with_crc)
if 0:
print "payload_with_crc =", string_to_hex_list(payload_with_crc)
print "ok = %r, len(payload) = %d" % (ok, len(payload))
print "payload =", string_to_hex_list(payload)
return ok, payload