void rs_decode(uint8_t rs[2][RS_BLOCK_SIZE], uint8_t data[DATA_SIZE], int8_t error[2]) {
uint16_t i;
error[0] = decode_rs_8(rs[0], NULL, 0);
error[1] = decode_rs_8(rs[1], NULL, 0);
for (i = 0; i < DATA_SIZE; ++i) {
data[i] = rs[i & 1][i >> 1];
}
}
int decode_rs_ccsds(unsigned char *data,int *eras_pos,int no_eras){
int i,r;
unsigned char cdata[NN];
/* Convert data from dual basis to conventional */
for(i=0;i<NN;i++)
cdata[i] = Tal1tab[data[i]];
r = decode_rs_8(cdata,eras_pos,no_eras);
if(r > 0){
/* Convert from conventional to dual basis */
for(i=0;i<NN;i++)
data[i] = Taltab[cdata[i]];
}
return r;
}
int main(){
unsigned char block[255];
int i;
void *rs;
struct rusage start,finish;
double extime;
int trials = 10000;
for(i=0;i<223;i++)
block[i] = 0x01;
rs = init_rs_char(8,0x187,112,11,32,0);
encode_rs_char(rs,block,&block[223]);
getrusage(RUSAGE_SELF,&start);
for(i=0;i<trials;i++){
#if 0
block[0] ^= 0xff; /* Introduce an error */
block[2] ^= 0xff; /* Introduce an error */
#endif
decode_rs_char(rs,block,NULL,0);
}
getrusage(RUSAGE_SELF,&finish);
extime = finish.ru_utime.tv_sec - start.ru_utime.tv_sec + 1e-6*(finish.ru_utime.tv_usec - start.ru_utime.tv_usec);
printf("Execution time for %d Reed-Solomon blocks using general decoder: %.2f sec\n",trials,extime);
printf("decoder speed: %g bits/s\n",trials*223*8/extime);
encode_rs_8(block,&block[223],0);
getrusage(RUSAGE_SELF,&start);
for(i=0;i<trials;i++){
#if 0
block[0] ^= 0xff; /* Introduce an error */
block[2] ^= 0xff; /* Introduce an error */
#endif
decode_rs_8(block,NULL,0,0);
}
getrusage(RUSAGE_SELF,&finish);
extime = finish.ru_utime.tv_sec - start.ru_utime.tv_sec + 1e-6*(finish.ru_utime.tv_usec - start.ru_utime.tv_usec);
printf("Execution time for %d Reed-Solomon blocks using CCSDS decoder: %.2f sec\n",trials,extime);
printf("decoder speed: %g bits/s\n",trials*223*8/extime);
exit(0);
}