grub/commands/hexdump.c
proski 4c402e7301 2009-05-03 Pavel Roskin <proski@gnu.org>
* disk/ata.c: Don't cast mod to void in GRUB_MOD_INIT to
	suppress warnings.  It's no longer needed.
	* disk/host.c: Likewise.
	* disk/ata_pthru.c: Likewise.
	* disk/loopback.c: Likewise.
	* hook/datehook.c: Likewise.
	* parttool/pcpart.c: Likewise.
	* fs/i386/pc/pxe.c: Likewise.
	* fs/ntfscomp.c: Likewise.
	* efiemu/main.c: Likewise.
	* mmap/mmap.c: Likewise.
	* commands/crc.c: Likewise.
	* commands/hexdump.c: Likewise.
	* commands/hdparm.c: Likewise.
	* commands/acpi.c: Likewise.
	* commands/echo.c: Likewise.
	* commands/minicmd.c: Likewise.
	* commands/blocklist.c: Likewise.
	* commands/memrw.c: Likewise.
	* commands/loadenv.c: Likewise.
	* commands/usbtest.c: Likewise.
	* commands/lsmmap.c: Likewise.
	* commands/boot.c: Likewise.
	* commands/parttool.c: Likewise.
	* commands/configfile.c: Likewise.
	* commands/search.c: Likewise.
	* commands/ieee1275/suspend.c: Likewise.
	* commands/cat.c: Likewise.
	* commands/i386/pc/pxecmd.c: Likewise.
	* commands/i386/pc/play.c: Likewise.
	* commands/i386/pc/halt.c: Likewise.
	* commands/i386/pc/vbeinfo.c: Likewise.
	* commands/i386/pc/vbetest.c: Likewise.
	* commands/lspci.c: Likewise.
	* commands/date.c: Likewise.
	* commands/handler.c: Likewise.
	* commands/ls.c: Likewise.
	* commands/test.c: Likewise.
	* commands/cmp.c: Likewise.
	* commands/efi/loadbios.c: Likewise.
	* commands/efi/fixvideo.c: Likewise.
	* commands/halt.c: Likewise.
	* commands/help.c: Likewise.
	* commands/reboot.c: Likewise.
	* hello/hello.c: Likewise.
	* script/sh/main.c: Likewise.
	* loader/xnu.c: Likewise.
	* term/terminfo.c: Likewise.
	* term/i386/pc/serial.c: Likewise.
	* term/usb_keyboard.c: Likewise.
2009-05-04 03:49:08 +00:00

138 lines
3.5 KiB
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/* hexdump.c - command to dump the contents of a file or memory */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007,2008 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/gzio.h>
#include <grub/partition.h>
#include <grub/lib/hexdump.h>
#include <grub/extcmd.h>
static const struct grub_arg_option options[] = {
{"skip", 's', 0, "skip offset bytes from the beginning of file.", 0,
ARG_TYPE_INT},
{"length", 'n', 0, "read only length bytes", 0, ARG_TYPE_INT},
{0, 0, 0, 0, 0, 0}
};
static grub_err_t
grub_cmd_hexdump (grub_extcmd_t cmd, int argc, char **args)
{
struct grub_arg_list *state = cmd->state;
char buf[GRUB_DISK_SECTOR_SIZE * 4];
grub_ssize_t size, length;
grub_addr_t skip;
int namelen;
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
namelen = grub_strlen (args[0]);
skip = (state[0].set) ? grub_strtoul (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 *) 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;
if (disk->partition)
skip += grub_partition_get_start (disk->partition) << GRUB_DISK_SECTOR_BITS;
sector = (skip >> (GRUB_DISK_SECTOR_BITS + 2)) * 4;
ofs = skip & (GRUB_DISK_SECTOR_SIZE * 4 - 1);
while (length)
{
grub_size_t len, n;
len = length;
if (ofs + len > sizeof (buf))
len = sizeof (buf) - ofs;
n = ((ofs + len + GRUB_DISK_SECTOR_SIZE - 1)
>> GRUB_DISK_SECTOR_BITS);
if (disk->dev->read (disk, sector, n, buf))
break;
hexdump (skip, &buf[ofs], len);
ofs = 0;
skip += len;
length -= len;
sector += 4;
}
grub_disk_close (disk);
}
else
{
grub_file_t file;
file = grub_gzfile_open (args[0], 1);
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,
GRUB_COMMAND_FLAG_BOTH,
"hexdump [OPTIONS] FILE_OR_DEVICE",
"Dump the contents of a file or memory.",
options);
}
GRUB_MOD_FINI (hexdump)
{
grub_unregister_extcmd (cmd);
}