/* 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 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 NROOTS (51) #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_int void 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);