61    FILE *fin, *fout;  in main()  local
99    fin = fopen(argv[argc-2], "r");  in main()
100    if(fin==NULL)  in main()
109      fclose(fin);  in main()
122          err = fread(ch, 1, 4, fin);  in main()
127              if (feof(fin))  in main()
132                 fclose(fin);  in main()
138          err = fread(ch, 1, 4, fin);  in main()
140          err = fread(packets[i], 1, len[i], fin);  in main()
141          if (feof(fin))  in main()
214    fclose(fin);  in main()