| /* crc.c - command to calculate the crc32 checksum of a file */ |
| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2008 Free Software Foundation, Inc. |
| * |
| * GRUB 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 3 of the License, or |
| * (at your option) any later version. |
| * |
| * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <grub/dl.h> |
| #include <grub/disk.h> |
| #include <grub/file.h> |
| #include <grub/misc.h> |
| #include <grub/lib/crc.h> |
| #include <grub/command.h> |
| |
| static grub_err_t |
| grub_cmd_crc (grub_command_t cmd __attribute__ ((unused)), |
| int argc, char **args) |
| |
| { |
| grub_file_t file; |
| char buf[GRUB_DISK_SECTOR_SIZE]; |
| grub_ssize_t size; |
| grub_uint32_t crc; |
| |
| if (argc != 1) |
| return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required"); |
| |
| file = grub_file_open (args[0]); |
| if (! file) |
| return 0; |
| |
| crc = 0; |
| while ((size = grub_file_read (file, buf, sizeof (buf))) > 0) |
| crc = grub_getcrc32 (crc, buf, size); |
| |
| grub_file_close (file); |
| |
| grub_printf ("%08x\n", crc); |
| |
| return 0; |
| } |
| |
| static grub_command_t cmd; |
| |
| GRUB_MOD_INIT(crc) |
| { |
| cmd = grub_register_command ("crc", grub_cmd_crc, |
| "crc FILE", |
| "Calculate the crc32 checksum of a file."); |
| } |
| |
| GRUB_MOD_FINI(crc) |
| { |
| grub_unregister_command (cmd); |
| } |