WSJT-X/lib/int.h
Joe Taylor 7369062c4a Rename library directory
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2635 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2012-10-03 14:31:43 +00:00

58 lines
1.6 KiB
C

/* 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);