def fgbcompute(f, r):
for n in range(r):
ident = randombinary(49)
while ident[:2] == '101':
ident = randombinary(49)
pdf1 = preamble + short_long + user_location + countrycode + ident
bch1 = Fcn.calcbch(('_' + pdf1 + '0' * 59), "1001101101100111100011",
25, 86, 107)
newbin = pdf1 + bch1
supdata = randombinary(26)
bch2 = ''
try:
bch2 = Fcn.calcbch('_' + newbin + supdata + '0' * 12,
'1010100111001', 107, 133, 145)
except IndexError:
print('error')
print(len('_' + newbin + supdata + '0' * 12))
finalbin = newbin + supdata + bch2
hexvalid = Fcn.bin2hex(finalbin[24:])
r1 = 0 # str(random.randint(0,4))
r2 = 3 # str(random.randint(0,3))
hexbad = random_error(hexvalid, r1, r2, 0)
f.writelines(['{},{},{},{}'.format(hexvalid, r1, r2, hexbad), '\n'])
def bch1_binarycalc(inputhex):
try:
bin = Fcn.hextobin(inputhex)
except TypeError as err:
return [inputhex + ' Is not a valid hex']
result = ''
if len(inputhex) == 36:
strhex = inputhex[6:]
bin = bin[24:]
result = Fcn.calcbch(bin, "1001101101100111100011", 0, 61, 82)
elif len(inputhex) == 30:
strhex = inputhex
result = Fcn.calcbch(bin, "1001101101100111100011", 0, 61, 82)
elif len(inputhex) == 63:
# SGB recalc bch1
strhex = inputhex
result = Fcn2.calcBCH(bin[2:], 0, 202, 250)
else:
result = 'Invalid Input Hex length of ' + str(
len(inputhex)) + '.' + ' Valid length of FGB 30/36 or 63 for SGB'
return result
def bch2_binarycalc(inputhex):
try:
bin = Fcn.hextobin(inputhex)
except TypeError as err:
return [inputhex + ' Is not a valid hex']
result = ''
if len(inputhex) == 36:
strhex = inputhex[6:]
bin = bin[24:]
result = Fcn.calcbch(bin, '1010100111001', 82, 108, 120)
elif len(inputhex) == 30:
strhex = inputhex
result = Fcn.calcbch(bin, '1010100111001', 82, 108, 120)
elif len(inputhex) == 63:
return ""
else:
result = 'Invalid Input Hex length of ' + str(
len(inputhex)) + '.' + ' Valid lengths of FGB message are 30 or 36'
return result
def encodelongFGB(hex_code, latitude, southnorth, longitude, eastwest,
suppdata):
latitude = round(float(latitude) * 1000, 0)
longitude = round(float(longitude) * 1000, 0)
c = decodehex2.BeaconFGB()
try:
c.processHex(str(hex_code.strip()))
if c.protocolflag() == 'User':
binstr = c.bin[0:25] + '1' + c.bin[26:86]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata
binstr = binstr + str(southnorth) + dec2bin(int(float(latitude/1000)),7) + \
dec2bin( round(( float(latitude/1000) - int(float(latitude/1000))) * 15,0) ,4) + str(eastwest) + \
dec2bin(int(float(longitude / 1000)), 8) + \
dec2bin(round((float(longitude / 1000) - int(float(longitude / 1000))) * 15, 0), 4)
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype() in [
'Standard Location', 'Standard Location Protocol - Test'
]:
bincoord = stdloc(latitude, longitude)
binstr = c.bin[0:25] + '1' + c.bin[26:65] + str(
southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata + bincoord[2] + bincoord[3]
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype() in [
'ELT-DT Location', 'RLS Location'
]:
bincoord = eltdt_rls(latitude, longitude)
binstr = c.bin[0:25] + '1' + c.bin[26:67] + str(
southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata + bincoord[2] + bincoord[3]
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype(
) == 'National Location':
bincoord = natloc(latitude, longitude)
binstr = c.bin[0:25] + '1' + c.bin[26:59] + str(
southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata + bincoord[2] + bincoord[
3] + '000000'
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
return bin2hex(binstr[1:])
except decodehex2.HexError as e:
print(e.value, e.message)
def __init__(self, testbin, mtype):
bch1 = bch2 = bch1error = bch2error = 'na'
self.complete = '0'
if mtype in [
'Short Msg', 'Long Msg no Framesynch',
'Long Msg with Framesynch'
]:
bch1 = Fcn.calcbch(testbin, "1001101101100111100011", 25, 86, 107)
bch1error = self.errors(testbin[86:107], bch1)
if mtype in ['Long Msg no Framesynch', 'Long Msg with Framesynch']:
bch2 = Fcn.calcbch(testbin, '1010100111001', 107, 133, 145)
bch2error = self.errors(testbin[133:145], bch2)
if bch2error == 0:
self.complete = '1'
self.bch = (bch1, bch2, testbin[86:107], testbin[133:145], bch1error,
bch2error)
def bch_recalc(inputhex):
results = [inputhex]
preamble = ''
if len(inputhex) == 36:
strhex = inputhex[6:]
preamble = inputhex[:6]
elif len(inputhex) == 30:
strhex = inputhex
preamble = ''
else:
type = 'Hex length of ' + str(
len(inputhex)
) + '.' + ' Length of First Generation Beacon Hex Code to test BCH must be 30 or 36'
return [type]
try:
bin = Fcn.hextobin(strhex)
_pdf1 = (bin)[:61]
_bch1 = (bin)[61:82]
_pdf2 = (bin)[82:108]
_bch2 = (bin)[108:]
bch1calc = Fcn.calcbch(bin, "1001101101100111100011", 0, 61, 82)
bch2calc = Fcn.calcbch(bin, '1010100111001', 82, 108, 120)
if _pdf1 + bch1calc + _pdf2 + bch2calc == bin:
results.append(
'bch1 and bch2 recomputed from provided pdf1 and pdf2 match')
else:
if bch1calc != _bch1:
results.append(
'bch1 recomputed from provided pdf1 in input message {}'.
format(bch1calc))
if bch2calc != _bch2:
results.append(
'bch2 recomputed from provided pdf2 in input message {}'.
format(bch2calc))
results.append(preamble +
Fcn.bin2hex(_pdf1 + bch1calc + _pdf2 + bch2calc))
return results
except TypeError as err:
return [inputhex + ' Is not a valid hex']
def samplepdf2(f, r):
for n in range(r):
pdf2 = randombinary(26).zfill(26)
bch2 = Fcn.calcbch('0' * 107 + pdf2, '1010100111001', 107, 133,
145) + '0000'
bch = bchlib.BCH(67, 2)
data = bytearray(bch1correct.bitstring_to_bytes(pdf2))
ecc = bch.encode(data)
bchstring = (Fcn.dec2bin(ecc[0]).zfill(8) +
Fcn.dec2bin(ecc[1]).zfill(8))[:12] + '0000'
e = random.sample(range(0, 38), 3)
scramble = list(pdf2 + bch2)
for i in e:
scramble[i] = str(int(not int(scramble[i])))
corrupt = ''.join(scramble)
ecc_provided = bytearray(bch1correct.bitstring_to_bytes(corrupt[26:]))
data_provided = bytearray(bch1correct.bitstring_to_bytes(corrupt[:26]))
ecc_c = bch.encode(data_provided)
print(ecc_c == ecc_provided, ecc, ecc_provided)
packet = bytearray(bch1correct.bitstring_to_bytes(
corrupt[:26])) + bytearray(
bch1correct.bitstring_to_bytes(corrupt[26:]))
data, ecc = packet[:-bch.ecc_bytes], packet[-bch.ecc_bytes:]
bitflips = bch.decode_inplace(data, ecc)
newdata = Fcn.dec2bin(data[0]).zfill(2)
for e in data[1:]:
binchar = Fcn.dec2bin(e).zfill(8)
newdata = newdata + binchar
correctedbch2 = '' # decodefunctions.dec2bin(ecc[0])
for e in ecc:
binchar = Fcn.dec2bin(e).zfill(8)
correctedbch2 = correctedbch2 + binchar
correctedbch2 = correctedbch2[:-4]
bch2 = bch2[:-4]
bchstring = bchstring[:-4]
f.writelines([
'{},{},{},{},{},{},{},{}'.format(
pdf2 + bch2, bch2 == bchstring, corrupt, len(pdf2 + bch2),
corrupt == pdf2 + bch2, newdata + correctedbch2,
newdata + correctedbch2 == pdf2 + bch2, bitflips), '\n'
])
bch1='001000100000000101001'
bitflips,newpdf,newbch = pdf1_to_bch1(pdf1,bch1)
print(pdf1)
print(newpdf,len(newpdf))
print
print(bch1)
print(newbch,len(newbch))
print(bitflips)
if bitflips==-1:
print('fail')
pdf1=(decodefunctions.hextobin('D3C4EB28140AA681100A444154C224'))[:61]
bch1=(decodefunctions.hextobin('D3C4EB28140AA681100A444154C224'))[61:82]
#print('93CB0242508F3BC928BCB407180EC6',pdf1,len(pdf1))
#print('bch1',bch1,len(bch1))
pdf1= (decodefunctions.hextobin('9D6940000045DF533687000452A622'))[:61]
bch1 = (decodefunctions.hextobin('9D6940000045DF533687000452A622'))[61:82]
bch1corrected = decodefunctions.calcbch(pdf1,"1001101101100111100011", 0, 61, 82)
pdf2bch2=(decodefunctions.hextobin('9D6940000045DF533687000452A622'))[82:]
print(pdf1+bch1,len(pdf1+bch1))
print(bch1corrected)
print(pdf1 + bch1 + pdf2bch2, len(pdf1 + bch1+pdf2bch2))
print(decodefunctions.bin2hex((pdf1 + bch1corrected+pdf2bch2)))
b = '0'
else:
b = '1'
binstr = binstr + b
return binstr
preamble = '000000000000000000101111'
short_long = '1'
user_location = '1'
countrycode = '0100111100' #316 - Canada
for n in range(10000):
ident = randombinary(49)
pdf1 = preamble + short_long + user_location + countrycode + ident
bch1 = Fcn.calcbch(('_' + pdf1 + '0' * 59), "1001101101100111100011", 25,
86, 107)
newbin = pdf1 + bch1
supdata = randombinary(26)
bch2 = Fcn.calcbch('_' + newbin + supdata + '0' * 12, '1010100111001', 107,
133, 145)
finalbin = newbin + supdata + bch2
# print(Fcn.bin2hex(finalbin))
hexcheck = Fcn.bin2hex(finalbin)
if decodehex2.BeaconFGB(hexcheck).errors == []:
decoded.write(hexcheck + '\n')
decoded.close()
def encodelongFGB(hex_code, formdata):
for e in formdata:
print('form control' , e, formdata[e])
c = decodehex2.BeaconFGB()
pad24='1'*16 +'000101111'
try:
c.processHex(str(hex_code.strip()))
if c.loctype()!='National User':
latitude = round(float(formdata['latitude']) * 1000, 0)
longitude = round(float(formdata['longitude']) * 1000, 0)
southnorth = formdata['northsouth']
eastwest = formdata['eastwest']
if c.protocolflag() == 'User' and c.loctype()!='National User':
suppdata= formdata['encodepos']
binstr = pad24 + '1' + c.bin[26:86]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata
binstr = binstr + str(southnorth) + dec2bin(int(float(latitude/1000)),7) + \
dec2bin( round(( float(latitude/1000) - int(float(latitude/1000))) * 15,0) ,4) + str(eastwest) + \
dec2bin(int(float(longitude / 1000)), 8) + \
dec2bin(round((float(longitude / 1000) - int(float(longitude / 1000))) * 15, 0), 4)
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.loctype() == 'National User':
binstr = '_'+ '1'*15 + '000101111' + '1' + c.bin[26:86]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 +'0' *26
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype() in \
['Location: Standard Location Protocol - ELT (Serial)','Standard Location','Standard Location Protocol - Test','Standard Location Protocol - PLB (Serial)','Standard Location Protocol - EPIRB (Serial)','Std Loc. Serial ELT - Aircraft Operator Designator Protocol']:
bincoord = stdloc(latitude, longitude)
suppdata = '1101' + formdata['encodepos'] + formdata['auxdevice']
binstr = pad24 + '1' + c.bin[26:65] + str(southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata + bincoord[2] + bincoord[3]
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype() == 'RLS Location Protocol':
# bit 115=132 are 18 bit location offset
suppdata = formdata['encodepos'] + \
formdata['auxdevice'] + \
formdata['rlmtypeone'] + \
formdata['rlmtypetwo'] + \
formdata['feedbacktype1'] + \
formdata['feedbacktype2'] + \
formdata['rlsprovider']
bincoord = eltdt_rls(latitude, longitude)
binstr = pad24 + '1' + c.bin[26:67] + str(southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata + bincoord[2] + bincoord[3]
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype() == definitions.ELT_DT_LOC:
suppdata = formdata['meansactivation'] + formdata['encodedaltitude'] + formdata['freshness']
aircraft3letter = formdata['aircraft_3ld']
if suppdata[-2:] != '00':
# bit 115=132 are 18 bit location offset
bincoord= eltdt_rls(latitude, longitude)
binstr ='_'+ '1'*15 + '000101111' + '1' + c.bin[26:67] + str(southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
binstr = binstr + bch1 + suppdata + bincoord[2] + bincoord[3]
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
else:
# bits 115-132 are aircraft 3 letter designators 000 and 3 segments of 5 bit modified baudot for each letter designator
bincoord = eltdt_rls(latitude, longitude)
binstr = '_' + '1'*15 + '000101111' + '1' + c.bin[26:67] + str(southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
aircraft3letterbin=''
for letter in aircraft3letter.strip():
try:
key = next(key for key, value in definitions.baudot.items() if value == letter.upper())
except StopIteration:
key = '111111'
key = key[1:]
aircraft3letterbin = aircraft3letterbin + key
aircraft3letterbin = aircraft3letterbin + '11111' * (3 - len(aircraft3letter.strip()))
binstr = binstr + bch1 + suppdata + '000' + aircraft3letterbin
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
elif c.protocolflag() == 'Location' and c.loctype() == 'National Location':
bincoord= natloc(latitude, longitude)
suppdata = '110' + formdata['nationalassign']+ formdata['encodepos'] + formdata['auxdevice']
binstr = pad24 + '1' + c.bin[26:59] + str(southnorth) + bincoord[0] + str(eastwest) + bincoord[1]
bch1 = calcbch(binstr, "1001101101100111100011", 25, 86, 107)
if formdata['nationalassign'] == '0':
refine = '0'*14
else:
refine = bincoord[2] + bincoord[3]
binstr = binstr + bch1 + suppdata + refine + '000000'
bch2 = calcbch(binstr, '1010100111001', 107, 133, 145)
binstr = binstr + bch2
return bin2hex(binstr[1:])
except decodehex2.HexError as e:
print(e.value, e.message)
