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c405c391 | 1 | /* hexdump.c - command to dump the contents of a file or memory */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
58bc8bd5 | 4 | * Copyright (C) 2007,2008,2009 Free Software Foundation, Inc. |
c405c391 | 5 | * |
6 | * GRUB is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * GRUB is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
c405c391 | 20 | #include <grub/dl.h> |
c405c391 | 21 | #include <grub/file.h> |
22 | #include <grub/disk.h> | |
23 | #include <grub/misc.h> | |
a85cd5a0 | 24 | #include <grub/lib/hexdump.h> |
b1b797cb | 25 | #include <grub/extcmd.h> |
77a79592 | 26 | #include <grub/i18n.h> |
c405c391 | 27 | |
e745cf0c VS |
28 | GRUB_MOD_LICENSE ("GPLv3+"); |
29 | ||
c405c391 | 30 | static const struct grub_arg_option options[] = { |
77a79592 | 31 | {"skip", 's', 0, N_("Skip offset bytes from the beginning of file."), 0, |
c405c391 | 32 | ARG_TYPE_INT}, |
77a79592 | 33 | {"length", 'n', 0, N_("Read only LENGTH bytes."), 0, ARG_TYPE_INT}, |
c405c391 | 34 | {0, 0, 0, 0, 0, 0} |
35 | }; | |
36 | ||
c405c391 | 37 | static grub_err_t |
28be0e94 | 38 | grub_cmd_hexdump (grub_extcmd_context_t ctxt, int argc, char **args) |
c405c391 | 39 | { |
28be0e94 | 40 | struct grub_arg_list *state = ctxt->state; |
25f16ec1 | 41 | char buf[GRUB_DISK_SECTOR_SIZE * 4]; |
c405c391 | 42 | grub_ssize_t size, length; |
2520d4b8 | 43 | grub_disk_addr_t skip; |
25f16ec1 | 44 | int namelen; |
c405c391 | 45 | |
46 | if (argc != 1) | |
9c4b5c13 | 47 | return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); |
c405c391 | 48 | |
25f16ec1 | 49 | namelen = grub_strlen (args[0]); |
2520d4b8 | 50 | skip = (state[0].set) ? grub_strtoull (state[0].arg, 0, 0) : 0; |
25f16ec1 | 51 | length = (state[1].set) ? grub_strtoul (state[1].arg, 0, 0) : 256; |
c405c391 | 52 | |
25f16ec1 | 53 | if (!grub_strcmp (args[0], "(mem)")) |
2520d4b8 | 54 | hexdump (skip, (char *) (grub_addr_t) skip, length); |
25f16ec1 | 55 | else if ((args[0][0] == '(') && (args[0][namelen - 1] == ')')) |
56 | { | |
57 | grub_disk_t disk; | |
58 | grub_disk_addr_t sector; | |
59 | grub_size_t ofs; | |
60 | ||
61 | args[0][namelen - 1] = 0; | |
62 | disk = grub_disk_open (&args[0][1]); | |
63 | if (! disk) | |
64 | return 0; | |
65 | ||
66 | sector = (skip >> (GRUB_DISK_SECTOR_BITS + 2)) * 4; | |
67 | ofs = skip & (GRUB_DISK_SECTOR_SIZE * 4 - 1); | |
68 | while (length) | |
69 | { | |
f84114f5 | 70 | grub_size_t len; |
25f16ec1 | 71 | |
72 | len = length; | |
f84114f5 | 73 | if (len > sizeof (buf)) |
74 | len = sizeof (buf); | |
25f16ec1 | 75 | |
f84114f5 | 76 | if (grub_disk_read (disk, sector, ofs, len, buf)) |
25f16ec1 | 77 | break; |
78 | ||
f84114f5 | 79 | hexdump (skip, buf, len); |
25f16ec1 | 80 | |
81 | ofs = 0; | |
82 | skip += len; | |
83 | length -= len; | |
84 | sector += 4; | |
85 | } | |
86 | ||
87 | grub_disk_close (disk); | |
88 | } | |
89 | else | |
c405c391 | 90 | { |
25f16ec1 | 91 | grub_file_t file; |
92 | ||
ca0a4f68 | 93 | file = grub_file_open (args[0], GRUB_FILE_TYPE_HEXCAT); |
25f16ec1 | 94 | if (! file) |
c405c391 | 95 | return 0; |
96 | ||
97 | file->offset = skip; | |
98 | ||
99 | while ((size = grub_file_read (file, buf, sizeof (buf))) > 0) | |
100 | { | |
101 | unsigned long len; | |
102 | ||
103 | len = ((length) && (size > length)) ? length : size; | |
104 | hexdump (skip, buf, len); | |
105 | skip += len; | |
106 | if (length) | |
107 | { | |
108 | length -= len; | |
109 | if (!length) | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | grub_file_close (file); | |
115 | } | |
c405c391 | 116 | |
117 | return 0; | |
118 | } | |
119 | \f | |
b1b797cb | 120 | static grub_extcmd_t cmd; |
c405c391 | 121 | |
122 | GRUB_MOD_INIT (hexdump) | |
123 | { | |
ed80f7d5 | 124 | cmd = grub_register_extcmd ("hexdump", grub_cmd_hexdump, 0, |
77a79592 | 125 | N_("[OPTIONS] FILE_OR_DEVICE"), |
9c4b5c13 | 126 | N_("Show raw contents of a file or memory."), |
b1b797cb | 127 | options); |
c405c391 | 128 | } |
129 | ||
130 | GRUB_MOD_FINI (hexdump) | |
131 | { | |
b1b797cb | 132 | grub_unregister_extcmd (cmd); |
c405c391 | 133 | } |