/* Include file to configure the RS codec for integer symbols * * Copyright 2002, Phil Karn, KA9Q * May be used under the terms of the GNU General Public License (GPL) */#define DTYPE int/* Reed-Solomon codec control block */struct rs {  int mm;              /* Bits per symbol */  int nn;              /* Symbols per block (= (1<<mm)-1) */  DTYPE *alpha_to;     /* log lookup table */  DTYPE *index_of;     /* Antilog lookup table */  DTYPE *genpoly;      /* Generator polynomial */  int nroots;     /* Number of generator roots = number of parity symbols */  int fcr;        /* First consecutive root, index form */  int prim;       /* Primitive element, index form */  int iprim;      /* prim-th root of 1, index form */  int pad;        /* Padding bytes in shortened block */};static inline int modnn(struct rs *rs,int x){  while (x >= rs->nn) {    x -= rs->nn;    x = (x >> rs->mm) + (x & rs->nn);  }  return x;}#define MODNN(x) modnn(rs,x)#define MM (rs->mm)#define NN (rs->nn)#define ALPHA_TO (rs->alpha_to) #define INDEX_OF (rs->index_of)#define GENPOLY (rs->genpoly)#define NROOTS (rs->nroots)#define FCR (rs->fcr)#define PRIM (rs->prim)#define IPRIM (rs->iprim)#define PAD (rs->pad)#define A0 (NN)#define ENCODE_RS encode_rs_int#define DECODE_RS decode_rs_int#define INIT_RS init_rs_int#define FREE_RS free_rs_intvoid ENCODE_RS(void *p,DTYPE *data,DTYPE *parity);int DECODE_RS(void *p,DTYPE *data,int *eras_pos,int no_eras);void *INIT_RS(int symsize,int gfpoly,int fcr,		   int prim,int nroots,int pad);void FREE_RS(void *p);