/* * (C) Copyright 2005 * 2N Telekomunikace, Ladislav Michl <michl@2n.cz> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <fcntl.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include "crcek.h" extern unsigned long crc32(unsigned long, const unsigned char *, unsigned int); uint32_t data[LOADER_SIZE/4 + 3]; int doit(char *path, unsigned version) { uint32_t *p; ssize_t size; int fd; fd = open(path, O_RDONLY); if (fd == -1) { perror("Error opening file"); return EXIT_FAILURE; } p = data + 2; size = read(fd, p, LOADER_SIZE + 4); if (size == -1) { perror("Error reading file"); return EXIT_FAILURE; } if (size > LOADER_SIZE) { fprintf(stderr, "File too large\n"); return EXIT_FAILURE; } size = (((size - 1) >> 2) + 1) << 2; data[0] = size + 4; /* add size of version field */ data[1] = version; data[(size >> 2) + 2] = crc32(0, (unsigned char *)(data + 1), data[0]); close(fd); if (write(STDOUT_FILENO, data, size + 3*4) == -1) { perror("Error writing file"); return EXIT_FAILURE; } return EXIT_SUCCESS; } int main(int argc, char **argv) { if (argc == 2) { return doit(argv[1], 0); } else if ((argc == 4) && (strcmp(argv[1], "-v") == 0)) { char *endptr, *nptr = argv[2]; unsigned ver = strtoul(nptr, &endptr, 0); if (*nptr != '\0' && *endptr == '\0') return doit(argv[3], ver); } fprintf(stderr, "Usage: crcit [-v version] <image>\n"); return EXIT_FAILURE; }