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sylnsfar
2016-08-28 16:50:37 +08:00
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ecc.py
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@ -1,28 +1,20 @@
# -*- coding: utf-8 -*-
#GP: Generator Polynomial, MP: Message Polynomial
GP_list = {
7: [0, 87, 229, 146, 149, 238, 102, 21],
10: [0, 251, 67, 46, 61, 118, 70, 64, 94, 32, 45],
13: [0, 74, 152, 176, 100, 86, 100, 106, 104, 130, 218, 206, 140, 78],
15: [0, 8, 183, 61, 91, 202, 37, 51, 58, 58, 237, 140, 124, 5, 99, 105],
16: [0, 120, 104, 107, 109, 102, 161, 76, 3, 91, 191, 147, 169, 182, 194, 225, 120],
17: [0, 43, 139, 206, 78, 43, 239, 123, 206, 214, 147, 24, 99, 150, 39, 243, 163, 136],
18: [0, 215, 234, 158, 94, 184, 97, 118, 170, 79, 187, 152, 148, 252, 179, 5, 98, 96, 153],
20: [0, 17, 60, 79, 50, 61, 163, 26, 187, 202, 180, 221, 225, 83, 239, 156, 164, 212, 212, 188, 190],
22: [0, 210, 171, 247, 242, 93, 230, 14, 109, 221, 53, 200, 74, 8, 172, 98, 80, 219, 134, 160, 105, 165, 231],
23: [0, 229, 121, 135, 48, 211, 117, 251, 126, 159, 180, 169, 152, 192, 226, 228, 218, 111, 117, 232, 87, 96, 227, 21],
26: [0, 173, 125, 158, 2, 103, 182, 118, 17, 145, 201, 111, 28, 165, 53, 161, 21, 245, 142, 13, 102, 48, 227, 153, 145, 218, 70],
28: [0, 168, 223, 200, 104, 224, 234, 108, 180, 110, 190, 195, 147, 205, 27, 232, 201, 21, 43, 245, 87, 42, 195, 212, 119, 242, 37, 9, 123],
30: [0, 41, 173, 145, 152, 216, 31, 179, 182, 50, 48, 110, 86, 239, 96, 222, 125, 42, 173, 226, 193, 224, 130, 156, 37, 251, 216, 238, 40, 192, 180]
}
from mylibs.constant import *
#ecc: Error Correction Codewords
def encode(ver, ecl, data_codewords):
en = ecc_num_per_block[ver-1][lindex[ecl]]
ecc = []
for dc in data_codewords:
ecc.append(get_ecc(dc, en))
return ecc
#DC: Data Codewords, ECC: Error Correction Codewords
def get_ECC(DC, ECC_num):
GP = GP_list[ECC_num]
remainder = DC
for i in range(len(DC)):
remainder = divide(remainder, *GP)
def get_ecc(dc, ecc_num):
gp = GP_list[ecc_num]
remainder = dc
for i in range(len(dc)):
remainder = divide(remainder, *gp)
return remainder
def divide(MP, *GP):