mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-22 04:11:16 -05:00
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
#include <math.h>
|
|
#include <stdio.h>
|
|
#include <float.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include "rs.h"
|
|
|
|
static void *rs;
|
|
static int first=1;
|
|
|
|
void rs_encode_(int *dgen, int *sent)
|
|
// Encode JT65 data dgen[12], producing sent[63].
|
|
{
|
|
int dat1[12];
|
|
int b[51];
|
|
int i;
|
|
|
|
if(first) {
|
|
// Initialize the JT65 codec
|
|
rs=init_rs_int(6,0x43,3,1,51,0);
|
|
first=0;
|
|
}
|
|
|
|
// Reverse data order for the Karn codec.
|
|
for(i=0; i<12; i++) {
|
|
dat1[i]=dgen[11-i];
|
|
}
|
|
// Compute the parity symbols
|
|
encode_rs_int(rs,dat1,b);
|
|
|
|
// Move parity symbols and data into sent[] array, in reverse order.
|
|
for (i = 0; i < 51; i++) sent[50-i] = b[i];
|
|
for (i = 0; i < 12; i++) sent[i+51] = dat1[11-i];
|
|
}
|
|
|
|
void rs_decode_(int *recd0, int *era0, int *numera0, int *decoded, int *nerr)
|
|
// Decode JT65 received data recd0[63], producing decoded[12].
|
|
// Erasures are indicated in era0[numera]. The number of corrected
|
|
// errors is *nerr. If the data are uncorrectable, *nerr=-1 is returned.
|
|
{
|
|
int numera;
|
|
int i;
|
|
int era_pos[50];
|
|
int recd[63];
|
|
|
|
if(first) {
|
|
rs=init_rs_int(6,0x43,3,1,51,0);
|
|
first=0;
|
|
}
|
|
|
|
numera=*numera0;
|
|
for(i=0; i<12; i++) recd[i]=recd0[62-i];
|
|
for(i=0; i<51; i++) recd[12+i]=recd0[50-i];
|
|
if(numera)
|
|
for(i=0; i<numera; i++) era_pos[i]=era0[i];
|
|
*nerr=decode_rs_int(rs,recd,era_pos,numera);
|
|
for(i=0; i<12; i++) decoded[i]=recd[11-i];
|
|
}
|
|
|
|
|
|
void rs_encode__(int *dgen, int *sent)
|
|
{
|
|
rs_encode_(dgen, sent);
|
|
}
|
|
|
|
void rs_decode__(int *recd0, int *era0, int *numera0, int *decoded, int *nerr)
|
|
{
|
|
rs_decode_(recd0, era0, numera0, decoded, nerr);
|
|
}
|
|
|