c405c39191
* conf/common.rmk (pkgdata_MODULES): Add hexdump.mod. (hexdump_mod_SOURCES): New variable. (hexdump_mod_CFLAGS): Likewise. (hexdump_mod_LDFLAGS): Likewise. * conf/i386-pc.rmk (grub_emu_SOURCES): Add command/hexdump.c. * conf/i386-efi.rmk (grub_emu_SOURCES): Add command/hexdump.c. * conf/i386-linuxbios.rmk (grub_emu_SOURCES): Add command/hexdump.c. * conf/powerpc-ieee1275.rmk (grub_emu_SOURCES): Add command/hexdump.c. * include/grub/hexdump.h: New file. * commands/hexdump.c: New file.
144 lines
3.3 KiB
C
144 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 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/normal.h>
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#include <grub/dl.h>
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#include <grub/arg.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/hexdump.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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void
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hexdump (unsigned long bse, char *buf, int len)
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{
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int pos;
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char line[80];
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while (len > 0)
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{
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int cnt, i;
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pos = grub_sprintf (line, "%08lx ", bse);
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cnt = 16;
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if (cnt > len)
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cnt = len;
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for (i = 0; i < cnt; i++)
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{
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pos += grub_sprintf (&line[pos], "%02x ", (unsigned char) buf[i]);
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if ((i & 7) == 7)
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line[pos++] = ' ';
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}
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for (; i < 16; i++)
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{
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pos += grub_sprintf (&line[pos], " ");
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if ((i & 7) == 7)
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line[pos++] = ' ';
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}
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line[pos++] = '|';
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for (i = 0; i < cnt; i++)
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line[pos++] = ((buf[i] >= 32) && (buf[i] < 127)) ? buf[i] : '.';
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line[pos++] = '|';
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line[pos] = 0;
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grub_printf ("%s\n", line);
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bse += 16;
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buf += 16;
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len -= cnt;
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}
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}
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static grub_err_t
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grub_cmd_hexdump (struct grub_arg_list *state, 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, length;
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unsigned long skip;
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int is_file;
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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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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) : 0;
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is_file = (grub_strcmp (args[0], "(mem)"));
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if ((!is_file) && (!length))
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length = 256;
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if (is_file)
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{
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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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else
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hexdump (skip, (char *) skip, length);
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return 0;
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}
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GRUB_MOD_INIT (hexdump)
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{
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(void) mod; /* To stop warning. */
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grub_register_command ("hexdump", grub_cmd_hexdump, GRUB_COMMAND_FLAG_BOTH,
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"hexdump [ -s offset ] [-n length] { FILE | (mem) }",
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"Dump the contents of a file or memory.", options);
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}
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GRUB_MOD_FINI (hexdump)
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{
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grub_unregister_command ("hexdump");
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}
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