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This commit is contained in:
Cort Buffington 2016-08-21 18:13:12 -05:00
parent 66412ef7af
commit c349765cd5
1 changed files with 15 additions and 7 deletions
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22
RS129.py
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@ -13,7 +13,6 @@ from __future__ import print_function
MASK = [0x96, 0x96, 0x96]
NUM_BYTES = 9
PARITY_BYTES = 3;
#MAXDEG = PARITY_BYTES * 2;
POLY= [64, 56, 14, 1, 0, 0, 0, 0, 0, 0, 0, 0]
EXP_TABLE = [
@ -73,7 +72,14 @@ LOG_TABLE = [
# For testing the code
def print_hex(_list):
print('[{}]'.format(', '.join(hex(x) for x in _list)))
# XOR parity bytes
def xor_parity(_parity):
_return = [0,0,0]
for i in range(3):
_return[i] = _parity[i] ^ MASK[i]
return _return
# multiplication using logarithms
def log_mult(a, b):
if a == 0 or b == 0:
@ -107,13 +113,15 @@ def RS129_check(_msg):
def print_hex(_list):
print('[{}]'.format(', '.join(hex(x) for x in _list)))
# 00 00 00 00.00.01 00.00.02 82.65.6d
message = [0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x02]
# 00 10 20 00.0c.30 2f.9b.e5 da.d4.5a
expectp = [0xda,0x4d,0x5a]
message = [0x00,0x10,0x20,0x00,0x0c,0x30,0x2f,0x9b,0xe5]
parity = RS129_encode(message)
xorparity = xor_parity(parity)
print_hex(xorparity)
print_hex(message+parity)
print(RS129_check(message+parity))