/* Configure the RS codec with fixed parameters for CCSDS standard * (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 2002 Phil Karn, KA9Q * May be used under the terms of the GNU General Public License (GPL) */#define DTYPE unsigned charstatic inline int mod255(int x){  while (x >= 255) {    x -= 255;    x = (x >> 8) + (x & 255);  }  return x;}#define MODNN(x) mod255(x)extern DTYPE CCSDS_alpha_to[];extern DTYPE CCSDS_index_of[];extern DTYPE 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#define A0 ((DTYPE)(NN))#define ENCODE_RS encode_rs_8#define DECODE_RS decode_rs_8void ENCODE_RS(DTYPE *data,DTYPE *parity,int pad);int DECODE_RS(DTYPE *data, int *eras_pos, int no_eras,int pad);