def main(d): result = "" bit_str = "" h = Hamming() if len(d['bits']) % 7: # Invalid message length return "Error!" for i in xrange(len(d['bits']) / 7): chunk = d['bits'][i*7:(i+1)*7] h.code(chunk) error_bit = h.check() if error_bit: bit_list = map(int, list(chunk)) bit_list[error_bit - 1] = int(not bit_list[error_bit - 1]) chunk = ''.join(map(str, bit_list)) h.code(chunk) if h.check(): # Still error after error correcting return "Error!" bit_str += ''.join(map(str, h.data())) #print bit_str for i in xrange(len(bit_str) / 8): chunk = bit_str[i*8:(i+1)*8] ch = 0 for b in chunk: ch <<= 1 ch |= int(b) if ch < 32 or ch > 127: return "Error!" # Contains non-printable characters result += chr(ch) return result
def main():
#define query doc here
cosine = Cosine(original_path, query_path)
jacardian = Jacardian(original_path, query_path)
hamming = Hamming(original_path, query_path)
print("Cosine similarity is:")
print(cosine.similarity())
print("Jacardian similarity is:")
print(jacardian.similarity())
print("Hamming similarity is:")
print(hamming.similarity())
def is_message_valid(message: str) -> bool:
if CommunicationSettings.check_sum is CheckSum.Parit_bit:
return ParityBit.check_parity(message)
elif CommunicationSettings.check_sum is CheckSum.CRC:
return CRC.check_CRC(message)
elif CommunicationSettings.check_sum is CheckSum.Hamming_code:
return Hamming.detectError(message)
def encode_message(message: str) -> str:
encodedMessage = ""
if CommunicationSettings.check_sum is CheckSum.Parit_bit:
encodedMessage = ParityBit.add_parity_bit(message)
elif CommunicationSettings.check_sum is CheckSum.CRC:
encodedMessage = CRC.encode_data(message)
elif CommunicationSettings.check_sum is CheckSum.Hamming_code:
encodedMessage = Hamming.encode_data(message)
return encodedMessage
def to_packet(self, message: str) -> None:
original_message = message
if CommunicationSettings.check_sum == CheckSum.Hamming_code:
message = Hamming.extractKey(message)
self.key = int(message[0:CommunicationSettings.key_bits], 2)
self.data = message[CommunicationSettings.
key_bits:CommunicationSettings.key_bits + 1]
self.is_valid = CommunicationSettings.is_message_valid(message)
if self.data == "1":
self.retransmit = True
elif self.data == "0":
self.retransmit = False
else:
self.is_valid = False
class HammingParameterizedPackage(unittest.TestCase):
def setUp(self):
self.tmp = Hamming()
@parameterized.expand([
("", "", 0),
("A", "A", 0),
("G", "T", 1),
("GGACTGAAATCTG", "GGACTGAAATCTG", 0),
("GGACGGATTCTG", "AGGACGGATTCT", 9),
])
def test_one_parameterized(self, a, b, dist):
self.assertEqual(self.tmp.distance(a, b), dist)
def tearDown(self):
self.temp = None
def to_packet(self, message: str) -> None:
#TODO: Change this convertion to include the ability to decode hamming code
original_message = message
if CommunicationSettings.check_sum == CheckSum.Hamming_code:
message = Hamming.extractKey(message)
key_str = message[0:CommunicationSettings.key_bits]
self.data = message[CommunicationSettings.key_bits: CommunicationSettings.data_bytes * 8 + CommunicationSettings.key_bits]
self.key = int(key_str, 2)
self.valid = CommunicationSettings.is_message_valid(original_message)
if key_str == "".rjust(CommunicationSettings.key_bits, "1"):
self.eot = True
else:
self.eot = False
def setErrors(data):
length = len(data)
i, j = 0, 7
while j <= length:
randIndex = randint(i, j - 1)
temp = data[randIndex]
temp = '1' if int(temp) == 0 else '0'
data = data[:randIndex] + temp + data[randIndex + 1:]
i = j
j += 7
return data
file = ReadFile('txt_files/Text.txt', analize=True)
source = Huffman(file.data)
encripted = source.encript(file.file_text)
channel = Hamming()
encripted = channel.encode(encripted)
#set errors
errorData = setErrors(encripted)
writeToFile('Encripted Text', errorData)
#fix errors
channel = Hamming()
trueData = channel.decode(errorData)
decripted = source.decript(trueData)
writeToFile('Decripted Text', decripted)
def setUp(self):
self.tmp = Hamming()
from FileUtil import FileUtil
from Hamming import Hamming
from NoiseGenerator import NoiseGenerator
source = FileUtil.read("source.txt")
ham = Hamming()
emis = ""
while len(source) >= 4:
mot = source[0:4]
emis += ham.hamming(mot)
source = source[4:]
FileUtil.write("emis.txt", emis)
recu = NoiseGenerator.convert(emis)
FileUtil.write("recu.txt", recu)
correct = ""
while len(recu) >= 7:
mot = recu[0:7]
correct += ham.correction(mot)
recu = recu[7:]
FileUtil.write("correct.txt", correct)
message = ""
while len(correct) >= 7:
mot = correct[0:7]
