1 /* Include file to configure the RS codec for integer symbols
3 * Copyright 2002, Phil Karn, KA9Q
4 * May be used under the terms of the GNU General Public License (GPL)
8 /* Reed-Solomon codec control block */
10 unsigned int mm; /* Bits per symbol */
11 unsigned int nn; /* Symbols per block (= (1<<mm)-1) */
12 int *alpha_to; /* log lookup table */
13 int *index_of; /* Antilog lookup table */
14 int *genpoly; /* Generator polynomial */
15 unsigned int nroots; /* Number of generator roots = number of parity symbols */
16 unsigned int fcr; /* First consecutive root, index form */
17 unsigned int prim; /* Primitive element, index form */
18 unsigned int iprim; /* prim-th root of 1, index form */
21 static inline int modnn(struct rs *rs,int x){
24 x = (x >> rs->mm) + (x & rs->nn);
28 #define MODNN(x) modnn(rs,x)
32 #define ALPHA_TO (rs->alpha_to)
33 #define INDEX_OF (rs->index_of)
34 #define GENPOLY (rs->genpoly)
35 #define NROOTS (rs->nroots)
37 #define PRIM (rs->prim)
38 #define IPRIM (rs->iprim)
41 #define ENCODE_RS encode_rs_int
42 #define DECODE_RS decode_rs_int
43 #define INIT_RS init_rs_int
44 #define FREE_RS free_rs_int
46 void ENCODE_RS(void *p,DTYPE *data,DTYPE *parity);
47 int DECODE_RS(void *p,DTYPE *data,int *eras_pos,int no_eras);
48 void *INIT_RS(unsigned int symsize,unsigned int gfpoly,unsigned int fcr,
49 unsigned int prim,unsigned int nroots);
50 void FREE_RS(void *p);