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[tangerine.git] / arch / common / boot / grub2 / commands / crc.c
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1 /* crc.c - command to calculate the crc32 checksum of a file */
2 /*
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2008 Free Software Foundation, Inc.
6 * GRUB is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * GRUB is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
20 #include <grub/normal.h>
21 #include <grub/dl.h>
22 #include <grub/arg.h>
23 #include <grub/disk.h>
24 #include <grub/file.h>
25 #include <grub/misc.h>
26 #include <grub/lib/crc.h>
28 static grub_err_t
29 grub_cmd_crc (struct grub_arg_list *state __attribute__ ((unused)),
30 int argc, char **args)
33 grub_file_t file;
34 char buf[GRUB_DISK_SECTOR_SIZE];
35 grub_ssize_t size;
36 grub_uint32_t crc;
38 if (argc != 1)
39 return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
41 file = grub_file_open (args[0]);
42 if (! file)
43 return 0;
45 crc = 0;
46 while ((size = grub_file_read (file, buf, sizeof (buf))) > 0)
47 crc = grub_getcrc32 (crc, buf, size);
49 grub_file_close (file);
51 grub_printf ("%08x\n", crc);
53 return 0;
56 GRUB_MOD_INIT(crc)
58 (void) mod; /* To stop warning. */
59 grub_register_command ("crc", grub_cmd_crc, GRUB_COMMAND_FLAG_BOTH,
60 "crc FILE", "Calculate the crc32 checksum of a file.", 0);
63 GRUB_MOD_FINI(crc)
65 grub_unregister_command ("crc");