1 /* hexdump.c - command to dump the contents of a file or memory */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2007,2008 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/>.
21 #include <grub/file.h>
22 #include <grub/disk.h>
23 #include <grub/misc.h>
24 #include <grub/gzio.h>
25 #include <grub/lib/hexdump.h>
26 #include <grub/extcmd.h>
28 static const struct grub_arg_option options
[] = {
29 {"skip", 's', 0, "skip offset bytes from the beginning of file.", 0,
31 {"length", 'n', 0, "read only length bytes", 0, ARG_TYPE_INT
},
36 grub_cmd_hexdump (grub_extcmd_t cmd
, int argc
, char **args
)
38 struct grub_arg_list
*state
= cmd
->state
;
39 char buf
[GRUB_DISK_SECTOR_SIZE
* 4];
40 grub_ssize_t size
, length
;
45 return grub_error (GRUB_ERR_BAD_ARGUMENT
, "file name required");
47 namelen
= grub_strlen (args
[0]);
48 skip
= (state
[0].set
) ? grub_strtoul (state
[0].arg
, 0, 0) : 0;
49 length
= (state
[1].set
) ? grub_strtoul (state
[1].arg
, 0, 0) : 256;
51 if (!grub_strcmp (args
[0], "(mem)"))
52 hexdump (skip
, (char *) skip
, length
);
53 else if ((args
[0][0] == '(') && (args
[0][namelen
- 1] == ')'))
56 grub_disk_addr_t sector
;
59 args
[0][namelen
- 1] = 0;
60 disk
= grub_disk_open (&args
[0][1]);
64 sector
= (skip
>> (GRUB_DISK_SECTOR_BITS
+ 2)) * 4;
65 ofs
= skip
& (GRUB_DISK_SECTOR_SIZE
* 4 - 1);
71 if (len
> sizeof (buf
))
74 if (grub_disk_read (disk
, sector
, ofs
, len
, buf
))
77 hexdump (skip
, buf
, len
);
85 grub_disk_close (disk
);
91 file
= grub_gzfile_open (args
[0], 1);
97 while ((size
= grub_file_read (file
, buf
, sizeof (buf
))) > 0)
101 len
= ((length
) && (size
> length
)) ? length
: size
;
102 hexdump (skip
, buf
, len
);
112 grub_file_close (file
);
118 static grub_extcmd_t cmd
;
120 GRUB_MOD_INIT (hexdump
)
122 cmd
= grub_register_extcmd ("hexdump", grub_cmd_hexdump
,
123 GRUB_COMMAND_FLAG_BOTH
,
124 "hexdump [OPTIONS] FILE_OR_DEVICE",
125 "Dump the contents of a file or memory.",
129 GRUB_MOD_FINI (hexdump
)
131 grub_unregister_extcmd (cmd
);