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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <inttypes.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fec.h>
#define FEC_RSM 255
#define FEC_ROOTS 16
#define FEC_RSN (FEC_RSM - FEC_ROOTS)
#define FEC_PARAMS(roots) \
8, 0x11d, 0, 1, (roots), 0
int main()
{
uint8_t data[FEC_RSM];
uint8_t dupl[FEC_RSM];
uint8_t corr[FEC_RSM];
int i, rc, neras, errors;
int erasures[FEC_RSM];
void *rs;
memset(data, 0x00, sizeof(data));
memset(corr, 0x00, sizeof(corr));
rs = init_rs_char(FEC_PARAMS(FEC_ROOTS));
if (!rs) {
perror("init_rs_char");
exit(1);
}
encode_rs_char(rs, data, &corr[FEC_RSN]);
for (neras = 1; neras <= FEC_ROOTS; ++neras) {
printf("%d errors\n", neras);
for (i = 0; i < neras; ++i) {
corr[i] = 0xFD;
erasures[i] = i;
}
memcpy(dupl, corr, sizeof(corr));
rc = decode_rs_char(rs, corr, NULL, 0);
printf("\tno erasures: %d\n", rc);
errors = 0;
for (i = 0; i < FEC_RSN; ++i) {
if (corr[i] != 0x00) {
printf("\t\terror at %d (%02x)\n", i, corr[i]);
++errors;
}
}
printf("\t\t%d errors in output\n", errors);
rc = decode_rs_char(rs, dupl, erasures, neras);
printf("\terasures: %d\n", rc);
errors = 0;
for (i = 0; i < FEC_RSN; ++i) {
if (dupl[i] != 0x00) {
printf("\t\terror at %d (%02x)\n", i, dupl[i]);
++errors;
}
}
printf("\t\t%d errors in output\n", errors);
}
exit(0);
}
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