| /* Stuff specific to the CCSDS (255,223) RS codec |
| * (255,223) code over GF(256). Note: the conventional basis is still |
| * used; the dual-basis mappings are performed in [en|de]code_rs_ccsds.c |
| * |
| * Copyright 2003 Phil Karn, KA9Q |
| * May be used under the terms of the GNU Lesser General Public License (LGPL) |
| */ |
| typedef unsigned char data_t; |
| |
| static inline int mod255(int x){ |
| while (x >= 255) { |
| x -= 255; |
| x = (x >> 8) + (x & 255); |
| } |
| return x; |
| } |
| #define MODNN(x) mod255(x) |
| |
| extern data_t CCSDS_alpha_to[]; |
| extern data_t CCSDS_index_of[]; |
| extern data_t CCSDS_poly[]; |
| |
| #define MM 8 |
| #define NN 255 |
| #define ALPHA_TO CCSDS_alpha_to |
| #define INDEX_OF CCSDS_index_of |
| #define GENPOLY CCSDS_poly |
| #define NROOTS 32 |
| #define FCR 112 |
| #define PRIM 11 |
| #define IPRIM 116 |
| #define PAD pad |
| |
