You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.3 KiB
94 lines
2.3 KiB
/*
|
|
* 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);
|
|
}
|