67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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/* crc.c - command to calculate the crc32 checksum of a file */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/arg.h>
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#include <grub/disk.h>
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/lib/crc.h>
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static grub_err_t
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grub_cmd_crc (struct grub_arg_list *state __attribute__ ((unused)),
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int argc, char **args)
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{
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grub_file_t file;
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char buf[GRUB_DISK_SECTOR_SIZE];
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grub_ssize_t size;
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grub_uint32_t crc;
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
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file = grub_file_open (args[0]);
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if (! file)
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return 0;
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crc = 0;
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while ((size = grub_file_read (file, buf, sizeof (buf))) > 0)
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crc = grub_getcrc32 (crc, buf, size);
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grub_file_close (file);
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grub_printf ("%08x\n", crc);
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return 0;
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}
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GRUB_MOD_INIT(crc)
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{
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(void) mod; /* To stop warning. */
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grub_register_command ("crc", grub_cmd_crc, GRUB_COMMAND_FLAG_BOTH,
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"crc FILE", "Calculate the crc32 checksum of a file.", 0);
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}
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GRUB_MOD_FINI(crc)
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{
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grub_unregister_command ("crc");
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}
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