def __init__(self, fisica):
""" Initializes the TX class
"""
self.fisica = fisica
self.buffer = bytes(bytearray())
self.threadStop = False
self.threadMutex = True
self.READLEN = 1024
self.crc = CRC()
def __init__(self, fisica):
""" Initializes the TX class
"""
self.fisica = fisica
self.buffer = bytes(bytearray())
self.transLen = 0
self.empty = True
self.threadMutex = False
self.threadStop = False
self.crc = CRC()
def write_danish_model_patron_card(self, uid, data):
block_number = 0
blocks = []
data_bytes = ['00' for x in range(32)]
version = '1'
usage_type = '8'
data_bytes[0] = version + usage_type
data_bytes[1] = '01' # partno
data_bytes[2] = '01' # nparts
userid = ['%02X' % ord(c) for c in data['user_id']]
print('userid:', userid)
data_bytes[3:3 + len(userid)] = userid
data_bytes[21:23] = ['%02X' % ord(c) for c in data['country']]
libnr = ['%02X' % ord(c) for c in data['library']]
data_bytes[23:23 + len(libnr)] = libnr
# CRC calculation:
p1 = data_bytes[0:19] # 19 bytes
p2 = data_bytes[21:32] # 11 bytes
p3 = ['00', '00'] # need to add 2 empty bytes to get 19 + 13 bytes
p = [int(x, 16) for x in p1 + p2 + p3]
crc = CRC().calculate(p)[::-1]
data_bytes[19:21] = crc
print(data_bytes)
return self.write_blocks_to_card(uid, data_bytes)
def __init__(self, name):
""" Initializes the enlace class
"""
self.fisica = fisica(name)
self.rx = RX(self.fisica)
self.tx = TX(self.fisica)
self.connected = False
self.crc = CRC()
def read_flash(self, start, len):
crc = CRC()
print "Reading " + str(len) + " bytes from address " + hex(start)
data = self.spi_read(start, len)
crc.process(data)
local_crc = crc.get_crc()
dev_crc = self.spi_compute_crc(start, start + len - 1)
if (local_crc != dev_crc):
print "CRC validation failed! Expected " + hex(
local_crc) + ", received " + hex(dev_crc)
return None
return data
def write_segment(self, address, data):
crc = CRC()
length = len(data)
# unprotect the status register
self.spi_common_command(self.SPI_CMD_WRITE_AFTER_EWSR, 0x01, 0, 1, 0)
# unprotect the flash
self.spi_common_command(self.SPI_CMD_WRITE_AFTER_WREN, 0x01, 0, 1, 0)
if (self._should_program_page(data)):
# set program size - 1, 255 maximum
self._i2c_write_reg(0x71, (length - 1) & 0xFF)
# set the programming address
self._i2c_write_reg(0x64, (address >> 16) & 0xFF)
self._i2c_write_reg(0x65, (address >> 8) & 0xFF)
self._i2c_write_reg(0x66, (address >> 0) & 0xFF)
# write the content to register 0x70
# we can only write 16 bytes at a time
for i in range(0, length, 16):
if (length - i >= 16):
self._i2c_write_bytes(0x70, data[i:i + 16])
else:
self._i2c_write_bytes(0x70, data[i:i + length - i])
# start programming
self._i2c_write_reg(0x6F, 0xA0)
crc.process(data)
if (not self._wait_write_done()):
return False
local_crc = crc.get_crc()
dev_crc = self.spi_compute_crc(address, address + length - 1)
if (local_crc != dev_crc):
print "CRC validation failed! Expected " + hex(
local_crc) + ", received " + hex(dev_crc)
return False
return True
def __init__(self, crc=None,
host=socket.gethostname(), port=8000,
window_size=8, drop_prob=0.1):
if crc == None:
crc = CRC()
self.crc = crc # This will act as a decoder and encoder for the protocol
self._init_socket(host, port)
self.host = host
self.port = port
self.window_size = window_size
def __init__(self,
user='******',
crc=None,
host=socket.gethostname(),
port=8000):
if crc == None:
crc = CRC()
self.crc = crc # This will act as a decoder and encoder for the protocol
self.user = user
self._init_socket(host, port)
self.host = host
self.port = port
def write_danish_model_tag(self, uid, data, max_attempts=20):
block_number = 0
blocks = []
data_bytes = ['00' for x in range(32)]
data_bytes[0] = '11'
data_bytes[1] = '%02X' % data['partno']
data_bytes[2] = '%02X' % data['nparts']
dokid = ['%02X' % ord(c) for c in data['id']]
data_bytes[3:3 + len(dokid)] = dokid
data_bytes[21:23] = ['%02X' % ord(c) for c in data['country']]
libnr = ['%02X' % ord(c) for c in data['library']]
data_bytes[23:23 + len(libnr)] = libnr
# CRC calculation:
p1 = data_bytes[0:19] # 19 bytes
p2 = data_bytes[21:32] # 11 bytes
p3 = ['00', '00'] # need to add 2 empty bytes to get 19 + 13 bytes
p = [int(x, 16) for x in p1 + p2 + p3]
crc = CRC().calculate(p)[::-1]
data_bytes[19:21] = crc
print(data_bytes)
for x in range(8):
print(data_bytes[x * 4:x * 4 + 4])
attempt = 1
while not self.write_block(uid, x, data_bytes[x * 4:x * 4 + 4]):
logger.warn('Attempt %d of %d: Write failed, retrying...' %
(attempt, max_attempts))
if attempt >= max_attempts:
return False
else:
attempt += 1
time.sleep(1.0)
return True
# first of all import the socket library
import socket, sys
from sys import getsizeof
from crc import CRC
from random import randrange
encoder = CRC()
s = socket.socket()
print("Socket successfully created")
if len(sys.argv) >= 2:
port = int(sys.argv[1])
else:
port = 8000
host = socket.gethostname()
s.bind((host, port))
print("socket binded to {}".format(port))
# put the socket into listening mode
s.listen(5)
print("socket is listening")
# Read input text
with open('input.txt', 'r') as f:
text = f.read()
frames = encoder.encode(text, verbose=True)
msglen = str(len(frames)).zfill(8)
print(getsizeof(frames))
c, addr = s.accept()
c.sendall(msglen.encode('utf-8'))
for f in frames:
def getCrc(self, data):
from crc import CRC
crc16 = CRC()
return crc16.update(data)
def geraQuadro(texto, ipOrigem, ipDestino, bitNumeroSequencia):
# flag delimitador ("~")
DELIMITADOR = "0b01111110"
# tamanho do texto de entrada
tamanho = bin(len(texto))
tamanho = tamanho[2:]
# deixa o tamanho com 8 bits
while (len(tamanho) < 8):
tamanho = "0" + tamanho
tamanho = "0b" + tamanho
# deixa cada caractere do texto com 8 bits e junta os bits do texto
bitsTexto = completaASCII(texto)
# byte da sequencia-ack codificado em binário
sequenciaACK = "0b" + bitNumeroSequencia + "0000000"
destino = converteIpParaBinario(ipDestino)
origem = converteIpParaBinario(ipOrigem)
# junta os bytes do endereco de origem
bitsEnderecoOrigem = "0b" + uneBytes(origem)
# junta os bytes do endereco de destino
bitsEnderecoDestino = "0b" + uneBytes(destino)
# junta todos os bits a serem enviados, exceto o delimitador
mensagem = tamanho + sequenciaACK[2:] + bitsEnderecoDestino[2:]
mensagem += bitsEnderecoOrigem[2:] + bitsTexto[2:]
# calcula o crc com a sequencia de bytes ("0's a esquerda sao incluídos")
crc = CRC()
mensagem = DELIMITADOR + mensagem[2:] + crc.geraCRC(mensagem)[2:]
mensagem = mensagem[2:]
# converte o resultado retornado pelo CRC em bytes (codificados em bits) separados
mensagemSeparada = []
i = 0
while (i < len(mensagem)):
novaMensagem = "0b"
novaMensagem += mensagem[i:(i + 8)]
mensagemSeparada.append(novaMensagem)
i += 8
# converte os bytes (codificados em bits), gerados anteriormente, em hexadecimal
# (se necessario acrescenta 0's para que cada byte tenha dois hexas)
for i in range(len(mensagemSeparada)):
mensagemSeparada[i] = str(hex(int(mensagemSeparada[i], 2)))[2:]
while (len(mensagemSeparada[i]) < 2):
mensagemSeparada[i] = "0" + mensagemSeparada[i]
# une todos os hexas (e consegue um Brasil hexa-campeão)
mensagem = ""
for item in mensagemSeparada:
mensagem += item
# converte os hexadecimais em um conjunto de bytes
mensagem = bytes.fromhex(mensagem)
return mensagem
class TX(object):
""" This class implements methods to handle the transmission
data over the p2p fox protocol
"""
def __init__(self, fisica):
""" Initializes the TX class
"""
self.fisica = fisica
self.buffer = bytes(bytearray())
self.transLen = 0
self.empty = True
self.threadMutex = False
self.threadStop = False
self.crc = CRC()
def thread(self):
""" TX thread, to send data in parallel with the code
"""
while not self.threadStop:
if (self.threadMutex):
self.transLen = self.fisica.write(self.buffer)
#print("O tamanho transmitido. IMpressao dentro do thread {}" .format(self.transLen))
self.threadMutex = False
def threadStart(self):
""" Starts TX thread (generate and run)
"""
self.thread = threading.Thread(target=self.thread, args=())
self.thread.start()
def threadKill(self):
""" Kill TX thread
"""
self.threadStop = True
def threadPause(self):
""" Stops the TX thread to run
This must be used when manipulating the tx buffer
"""
self.threadMutex = False
def threadResume(self):
""" Resume the TX thread (after suspended)
"""
self.threadMutex = True
def sendBuffer(self, data):
""" Write a new data to the transmission buffer.
This function is non blocked.
This function must be called only after the end
of transmission, this erase all content of the buffer
in order to save the new value.
"""
self.transLen = 0
self.buffer = data
self.threadMutex = True
def getBufferLen(self):
""" Return the total size of bytes in the TX buffer
"""
return (len(self.buffer))
def getStatus(self):
""" Return the last transmission size
"""
#print("O tamanho transmitido. Impressao fora do thread {}" .format(self.transLen))
return (self.transLen)
def getIsBussy(self):
""" Return true if a transmission is ongoing
"""
return (self.threadMutex)
def cria_package(self, payload, tipo, n_pacote, total_pacotes,
pacote_esperado):
#pega os dados e empacota com HEAD, EOP e byte Stuffing
byte_stuff = bytes.fromhex("AA")
eop = bytes.fromhex("FF FE FD FC")
payload_size = len(payload)
crc_payload = self.crc.encodeData(payload)
crc_payload = int(crc_payload, 2)
for i in range(len(payload)):
if payload[i:i + 4] == eop:
p1 = payload[0:i]
p2 = byte_stuff + payload[i:]
payload = p1 + p2
msg_type = (tipo).to_bytes(1, byteorder="big")
msg_size = (payload_size).to_bytes(3, byteorder="big")
msg_n = (n_pacote).to_bytes(1, byteorder="big")
total_n = (total_pacotes).to_bytes(1, byteorder="big")
pacote_e = (pacote_esperado).to_bytes(1, byteorder="big")
msg_crc = (crc_payload).to_bytes(3, byteorder="big")
head = msg_type + msg_size + msg_n + total_n + pacote_e + msg_crc
package = head + payload + eop
overhead = len(package) / len(payload)
print("OverHead:{0}".format(overhead))
print(len(payload))
return package
imd = ImageDisk()
if args.bit_rate is None:
args.bit_rate = args.modulation.default_bit_rate_kbps
crc_param = CRC.CRCParam(name = 'CRC-16-CCITT',
order = 16,
poly = 0x1021,
init = args.modulation.crc_init,
xorot = 0x0000,
refin = args.modulation.lsb_first,
refot = False)
crc = CRC(crc_param)
crc.make_table(8)
hbr = args.bit_rate * 2000 # half-bit rate in Hz
hbc = 1/hbr # half-bit cycle in s
first_sector = args.modulation.default_first_sector
sectors_per_track = args.modulation.default_sectors_per_track
bad_sectors = 0
data_sectors = 0
deleted_sectors = 0
total_sectors = 0
print("index mark option ignored, as HP M2FM doesn't use index marks")
args.index = False
if args.imagedisk_image is not None:
if args.comment is not None:
imd = ImageDisk(comment=args.comment)
else:
imd = ImageDisk()
if args.bit_rate is None:
args.bit_rate = args.modulation.default_bit_rate_kbps
crc_param = CRC.CRCParam(name='CRC-16-CCITT',
order=16,
poly=0x1021,
init=args.modulation.crc_init,
xorot=0x0000,
refin=args.modulation.lsb_first,
refot=False)
crc = CRC(crc_param)
crc.make_table(8)
hbr = args.bit_rate * 2000 # half-bit rate in Hz
hbc = 1 / hbr # half-bit cycle in s
first_sector = args.modulation.default_first_sector
sectors_per_track = args.modulation.default_sectors_per_track
bad_sectors = 0
data_sectors = 0
# Write to File
def f_write(decoded, f_name):
with open(f_name, 'a') as f:
f.write(decoded)
if __name__ == '__main__':
# Collect CLI arguments
port = int(sys.argv[1])
output_file = sys.argv[2]
probability = float(sys.argv[3])
hostname = ""
# Setup CRC
crc = CRC()
# data_pkt = namedtuple('data_pkt', 'seq_num frame')
# ack_pkt = namedtuple('ack_pkt', 'seq_num ack')
# Communication
s = socket(AF_INET, SOCK_DGRAM)
s.bind((hostname, port))
print("Listening for client requests ... ")
exp_seq_no = 0
while 1:
msg, client_address = s.recvfrom(65535)
data = pickle.loads(msg)
got_seq_no, frame = data['seq_num'], data['frame']
print('Packet Recv seq_no {} '.format(got_seq_no))
if random() < probability: # Random packet drop simulation
decoded = crc.decode([frame], verbose=True)
from crc import CRC
data = input("Enter Binary Data: ")
crc_polynomial = input("Enter CRC Polynomial: ")
crc = CRC(data, crc_polynomial)
print(crc)
if __name__ == '__main__':
# Set the start time
start_time = time.time()
# Get command line arguments
server_host = 'localhost'
port = int(sys.argv[1])
send_file = sys.argv[2]
window_size = 8
tempfile = 'tempfile.txt'
# Set the maximum buffer size
max_buff = 65535
# Setup CRC
crc = CRC()
data_pkt = namedtuple('data_pkt', 'seq_num frame')
ack_pkt = namedtuple('ack_pkt', 'seq_num ack')
# Encode the frames
frames = crc.encode(open(send_file, 'r').read())
# Setup global vars
total_frames = len(frames)
ack_recv_till = 0
seq_no_to_send = 0
status = {
'transfer_complete': False,
'window_low': 0,
'window_high': window_size - 1,
}
class RX(object):
""" This class implements methods to handle the reception
data over the p2p fox protocol
"""
def __init__(self, fisica):
""" Initializes the TX class
"""
self.fisica = fisica
self.buffer = bytes(bytearray())
self.threadStop = False
self.threadMutex = True
self.READLEN = 1024
self.crc = CRC()
def thread(self):
""" RX thread, to send data in parallel with the code
essa é a funcao executada quando o thread é chamado.
"""
while not self.threadStop:
if (self.threadMutex == True):
rxTemp, nRx = self.fisica.read(self.READLEN)
if (nRx > 0):
self.buffer += rxTemp
time.sleep(0.01)
def threadStart(self):
""" Starts RX thread (generate and run)
"""
self.thread = threading.Thread(target=self.thread, args=())
self.thread.start()
def threadKill(self):
""" Kill RX thread
"""
self.threadStop = True
def threadPause(self):
""" Stops the RX thread to run
This must be used when manipulating the Rx buffer
"""
self.threadMutex = False
def threadResume(self):
""" Resume the RX thread (after suspended)
"""
self.threadMutex = True
def getIsEmpty(self):
""" Return if the reception buffer is empty
"""
if (self.getBufferLen() == 0):
return (True)
else:
return (False)
def getBufferLen(self):
""" Return the total number of bytes in the reception buffer
"""
return (len(self.buffer))
def getAllBuffer(self, len):
""" Read ALL reception buffer and clears it
"""
self.threadPause()
b = self.buffer[:]
self.clearBuffer()
self.threadResume()
return (b)
def getBuffer(self, nData):
""" Remove n data from buffer
"""
self.threadPause()
b = self.buffer[0:nData]
self.buffer = self.buffer[nData:]
self.threadResume()
return (b)
def getNData(self):
""" Read N bytes of data from the reception buffer
This function blocks until the number of bytes is received
"""
# temPraLer = self.getBufferLen()
# print('leu %s ' + str(temPraLer) )
#if self.getBufferLen() < size:
#print("ERROS!!! TERIA DE LER %s E LEU APENAS %s", (size,temPraLer))
size = 0
time_out = time.time()
package_arbitrario = bytes.fromhex("F5 A3 AA C3 C3 B5 B4")
while (self.getBufferLen() > size or self.getBufferLen() == 0):
time.sleep(0.5)
size = self.getBufferLen()
run_time = time.time() - time_out
if run_time > 4:
return (package_arbitrario, len(package_arbitrario))
return (self.getBuffer(size), size)
def clearBuffer(self):
""" Clear the reception buffer
"""
self.buffer = b""
def desfaz_package(self, package):
#Faz o desempacotamento dos dados baseado-se no protocolo GG7.
#Separa o payload do restante e verifica se o tamanho do payload esta correto
ok = True
found_eop = False
byte_stuff = bytes.fromhex("AA")
eop = bytes.fromhex("FF FE FD FC")
head = package[0:10]
tipo = int(head[0])
n_pacote = int(head[4])
total_pacotes = int(head[5])
pacote_esperado = int(head[6])
crc_chegou = int.from_bytes(head[7:], byteorder="big")
package = package[10:]
payload_size = int.from_bytes(head[1:4], byteorder="big")
for i in range(len(package)):
if package[i:i + 4] == eop:
if package[i - 1] == byte_stuff:
#retira os bytes stuff
p1 = package[0:i - 1]
p2 = package[i:]
package = p1 + p2
else:
found_eop = True
print("EOP encontrado na posição:{0}".format(i))
package = package[0:-4]
if len(package) != payload_size:
ok = False
print(
"ERRO! Número de Bytes do Payload diferentes do informado no HEAD. Bytes Payload recebido:{0}"
.format(len(package)))
print("Bytes que foram enviados:{0}".format(
payload_size))
break
if not found_eop:
ok = False
print("ERRO! EOP não encontrado")
payload = package
crc_calculado = self.crc.encodeData(payload)
crc_calculado = int(crc_calculado, 2)
if crc_calculado == crc_chegou:
encoding = True
else:
encoding = False
print(len(payload))
return payload, tipo, ok, n_pacote, total_pacotes, pacote_esperado, encoding
data_pkt = namedtuple('data_pkt', 'seq_num frame')
ack_pkt = namedtuple('ack_pkt', 'seq_num ack')
class GoBackNSender():
'''
Paramters
- crc : crc scheme. Defaults to default CRC
- host : host
- port : port
'''
def __init__(self, crc=None,
host=socket.gethostname(), port=8000
window_size=8):
self.crc = crc if crc not None else CRC()
self._init_socket(host, port)
self.host = host
self.port = port
def _init_socket(self, host, port):
self.socket = socket.socket()
self.socket.bind((host, port))
self.socket.listen(1)
def _send_one_frame(self, frame, conn, corrupt_simulation=False):
# Put in corruptions
if randrange(0,10) <=2 and corrupt_simulation:
frame = self.crc._corrupt_frame(frame)
conn.sendall(str(frame).zfill(8).encode('utf-8'))
# conn.flush()
# from crc import CRC, CRC16, CRC32
from crc import CRC
print('Start Crc Test')
# crc16 = CRC(16, 0x8005, 0xffff, 0, False)
# crc16 = CRC(16, 0x8005, 0, 0)
crc16 = CRC()
a = list()
for i in range(0, 128):
a.append(i)
# print(a)
b = bytearray(a)
# print(b)
result = crc16.update(a)
print(result)
#
if __name__ == '__main__':
print('End of CRC Test')
def read_danish_model_tag(self, uid):
# Command code 0x23: Read multiple blocks
block_offset = 0
number_of_blocks = 8
response = self.issue_iso15693_command(
cmd='18',
flags=flagsbyte(address=True), # 32 (dec) <-> 20 (hex)
command_code='23',
data=uid + '%02X%02X' % (block_offset, number_of_blocks))
response = response[0]
if response == 'z':
return {'error': 'tag-conflict'}
elif response == '':
return {'error': 'read-failed'}
response = [response[i:i + 2] for i in range(2, len(response), 2)]
if response[0] == '00':
is_blank = True
else:
is_blank = False
# Reference:
# RFID Data model for libraries : Doc 067 (July 2005), p. 30
# <http://www.biblev.no/RFID/dansk_rfid_datamodel.pdf>
# RFID Data model for libraries (February 2009), p. 30
# http://biblstandard.dk/rfid/dk/RFID_Data_Model_for_Libraries_February_2009.pdf
version = response[0][0] # not sure if this is really the way to do it
if version != '0' and version != '1':
print(response)
return {'error': 'unknown-version: %s' % version}
usage_type = {
'0': 'acquisition',
'1': 'for-circulation',
'2': 'not-for-circulation',
'7': 'discarded',
'8': 'patron-card'
}[response[0][1]] # not sure if this is really the way to do it
nparts = int(response[1], 16)
partno = int(response[2], 16)
itemid = ''.join([chr(int(x, 16)) for x in response[3:19]])
crc = response[19:21]
country = ''.join([chr(int(x, 16)) for x in response[21:23]])
library = ''.join([chr(int(x, 16)) for x in response[23:32]])
# CRC calculation:
p1 = response[0:19] # 19 bytes
p2 = response[21:32] # 11 bytes
p3 = ['00', '00'] # need to add 2 empty bytes to get 19 + 13 bytes
p = [int(x, 16) for x in p1 + p2 + p3]
calc_crc = ''.join(CRC().calculate(p)[::-1])
crc = ''.join(crc)
return {
'error': '',
'is_blank': is_blank,
'usage_type': usage_type,
'uid': uid,
'id': itemid.strip('\0'),
'partno': partno,
'nparts': nparts,
'country': country,
'library': library.strip('\0'),
'crc': crc,
'crc_ok': calc_crc == crc
}
import os
import sys
import time
from crc import CRC
r_chan, w_chan = os.pipe()
r_ack, w_ack = os.pipe()
processid = os.fork()
if processid:
# This is the parent process (receiver)
decoder = CRC()
os.close(w_chan)
os.close(r_ack)
r_chan = os.fdopen(r_chan, 'r')
w_ack = os.fdopen(w_ack, 'w')
print("Parent reading")
length = r_chan.readline()[:-1]
length = int(length)
while length:
c = r_chan.read()
print(c)
w_ack.write('1')
length -= 1
sys.exit(0)
else:
# This is the child process (sender)
encoder = CRC()
os.close(r_chan)
os.close(w_ack)
w_chan = os.fdopen(w_chan, 'w')
import socket, sys
from crc import CRC
# Set up params
if len(sys.argv)>=2:
port = int(sys.argv[1])
else:
port = 8000
host = socket.gethostname()
frames = []
decoder = CRC()
# Set up socket
s = socket.socket()
s.connect((host, port))
l = int(s.recv(8).decode('utf_8'))
print(l)
print(type(l))
print('Got length {}'.format(l))
text = []
while l:
received = s.recv(8).decode('utf_8')
if received == '':
break
received = int(received)
print('Received {}'.format(received))
decoded_frame = decoder.decode([received], verbose=True)
if decoded_frame != None: