1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <inttypes.h> 18 #include <errno.h> 19 #include <sys/types.h> 20 #include <sys/stat.h> 21 #include <fcntl.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <unistd.h> 25 #include <string.h> 26 #include <fec.h> 27 28 #define FEC_RSM 255 29 #define FEC_ROOTS 16 30 #define FEC_RSN (FEC_RSM - FEC_ROOTS) 31 #define FEC_PARAMS(roots) \ 32 8, 0x11d, 0, 1, (roots), 0 33 34 int main() 35 { 36 uint8_t data[FEC_RSM]; 37 uint8_t dupl[FEC_RSM]; 38 uint8_t corr[FEC_RSM]; 39 int i, rc, neras, errors; 40 int erasures[FEC_RSM]; 41 void *rs; 42 43 memset(data, 0x00, sizeof(data)); 44 memset(corr, 0x00, sizeof(corr)); 45 46 rs = init_rs_char(FEC_PARAMS(FEC_ROOTS)); 47 48 if (!rs) { 49 perror("init_rs_char"); 50 exit(1); 51 } 52 53 encode_rs_char(rs, data, &corr[FEC_RSN]); 54 55 for (neras = 1; neras <= FEC_ROOTS; ++neras) { 56 printf("%d errors\n", neras); 57 58 for (i = 0; i < neras; ++i) { 59 corr[i] = 0xFD; 60 erasures[i] = i; 61 } 62 63 memcpy(dupl, corr, sizeof(corr)); 64 65 rc = decode_rs_char(rs, corr, NULL, 0); 66 67 printf("\tno erasures: %d\n", rc); 68 69 errors = 0; 70 for (i = 0; i < FEC_RSN; ++i) { 71 if (corr[i] != 0x00) { 72 printf("\t\terror at %d (%02x)\n", i, corr[i]); 73 ++errors; 74 } 75 } 76 printf("\t\t%d errors in output\n", errors); 77 78 rc = decode_rs_char(rs, dupl, erasures, neras); 79 80 printf("\terasures: %d\n", rc); 81 82 errors = 0; 83 for (i = 0; i < FEC_RSN; ++i) { 84 if (dupl[i] != 0x00) { 85 printf("\t\terror at %d (%02x)\n", i, dupl[i]); 86 ++errors; 87 } 88 } 89 printf("\t\t%d errors in output\n", errors); 90 } 91 92 exit(0); 93 } 94
