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/* hexdump.c - command to dump the contents of a file or memory */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007,2008,2009 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/file.h>
#include <grub/disk.h>
#include <grub/misc.h>
#include <grub/lib/hexdump.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
static const struct grub_arg_option options[] = {
{"skip", 's', 0, N_("Skip offset bytes from the beginning of file."), 0,
ARG_TYPE_INT},
{"length", 'n', 0, N_("Read only LENGTH bytes."), 0, ARG_TYPE_INT},
{0, 0, 0, 0, 0, 0}
};
static grub_err_t
grub_cmd_hexdump (grub_extcmd_context_t ctxt, int argc, char **args)
{
struct grub_arg_list *state = ctxt->state;
char buf[GRUB_DISK_SECTOR_SIZE * 4];
grub_ssize_t size, length;
grub_disk_addr_t skip;
int namelen;
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
namelen = grub_strlen (args[0]);
skip = (state[0].set) ? grub_strtoull (state[0].arg, 0, 0) : 0;
length = (state[1].set) ? grub_strtoul (state[1].arg, 0, 0) : 256;
if (!grub_strcmp (args[0], "(mem)"))
hexdump (skip, (char *) (grub_addr_t) skip, length);
else if ((args[0][0] == '(') && (args[0][namelen - 1] == ')'))
{
grub_disk_t disk;
grub_disk_addr_t sector;
grub_size_t ofs;
args[0][namelen - 1] = 0;
disk = grub_disk_open (&args[0][1]);
if (! disk)
return 0;
sector = (skip >> (GRUB_DISK_SECTOR_BITS + 2)) * 4;
ofs = skip & (GRUB_DISK_SECTOR_SIZE * 4 - 1);
while (length)
{
grub_size_t len;
len = length;
if (len > sizeof (buf))
len = sizeof (buf);
if (grub_disk_read (disk, sector, ofs, len, buf))
break;
hexdump (skip, buf, len);
ofs = 0;
skip += len;
length -= len;
sector += 4;
}
grub_disk_close (disk);
}
else
{
grub_file_t file;
file = grub_file_open (args[0], GRUB_FILE_TYPE_HEXCAT);
if (! file)
return 0;
file->offset = skip;
while ((size = grub_file_read (file, buf, sizeof (buf))) > 0)
{
unsigned long len;
len = ((length) && (size > length)) ? length : size;
hexdump (skip, buf, len);
skip += len;
if (length)
{
length -= len;
if (!length)
break;
}
}
grub_file_close (file);
}
return 0;
}
static grub_extcmd_t cmd;
GRUB_MOD_INIT (hexdump)
{
cmd = grub_register_extcmd ("hexdump", grub_cmd_hexdump, 0,
N_("[OPTIONS] FILE_OR_DEVICE"),
N_("Show raw contents of a file or memory."),
options);
}
GRUB_MOD_FINI (hexdump)
{
grub_unregister_extcmd (cmd);
}
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