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