| /* |
| * 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); |
| } |