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