72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/* 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) 2008,2010 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/dl.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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#include <grub/command.h>
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#include <grub/i18n.h>
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static grub_err_t
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grub_cmd_crc (grub_command_t cmd __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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if (grub_errno)
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goto fail;
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grub_printf ("%08x\n", crc);
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fail:
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grub_file_close (file);
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return 0;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(crc)
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{
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cmd = grub_register_command ("crc", grub_cmd_crc,
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N_("FILE"),
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N_("Calculate the crc32 checksum of a file."));
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}
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GRUB_MOD_FINI(crc)
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{
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grub_unregister_command (cmd);
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}
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