diff options
Diffstat (limited to 'grub-core/commands/hexdump.c')
| -rw-r--r-- | grub-core/commands/hexdump.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/grub-core/commands/hexdump.c b/grub-core/commands/hexdump.c new file mode 100644 index 0000000..eaa1246 --- /dev/null +++ b/grub-core/commands/hexdump.c @@ -0,0 +1,133 @@ +/* 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); +} |