busybox/util-linux/volume_id/iso9660.c
Denis Vlasenko c5b737231d volude_id: remove unused fields and functions which were setting them
function                                             old     new   delta
uuidcache_init                                       567     704    +137
findfs_main                                            -     125    +125
packed_usage                                       23662   23694     +32
static.drive_name_string                               -      14     +14
applet_names                                        1815    1822      +7
applet_main                                         1104    1108      +4
volume_id_open_node                                   35      38      +3
applet_nameofs                                       552     554      +2
get_devname_from_label                                78      79      +1
applet_install_loc                                   138     139      +1
volume_id_set_label_unicode16                         31      27      -4
volume_id_set_label_string                            74      70      -4
get_devname_from_uuid                                 63      59      -4
fs1                                                   12       8      -4
volume_id_set_unicode16                              209     202      -7
volume_id_free_buffer                                 71      56     -15
free_volume_id                                        52      37     -15
volume_id_probe_luks                                  97      79     -18
volume_id_set_usage_part                              21       -     -21
volume_id_probe_ufs                                  148     126     -22
volume_id_probe_lsi_mega_raid                        131     108     -23
volume_id_probe_highpoint_45x_raid                   127     104     -23
volume_id_probe_highpoint_37x_raid                    87      63     -24
volume_id_set_usage                                   28       -     -28
volume_id_probe_romfs                                121      93     -28
volume_id_set_label_raw                               30       -     -30
volume_id_probe_promise_fasttrack_raid               174     144     -30
volume_id_set_uuid                                   373     342     -31
volume_id_probe_xfs                                  122      91     -31
volume_id_probe_jfs                                  138     107     -31
volume_id_probe_ocfs2                                139     107     -32
volume_id_probe_lvm1                                  90      58     -32
volume_id_probe_cramfs                               106      63     -43
volume_id_probe_via_raid                             145     101     -44
volume_id_probe_intel_software_raid                  153     108     -45
volume_id_probe_minix                                121      74     -47
volume_id_probe_udf                                  682     632     -50
volume_id_probe_nvidia_raid                          158     108     -50
volume_id_probe_lvm2                                 128      78     -50
volume_id_probe_hpfs                                 117      67     -50
volume_id_probe_ext                                  143      93     -50
volume_id_probe_linux_raid                           191     139     -52
volume_id_probe_sysv                                 244     187     -57
volume_id_probe_silicon_medley_raid                  158      97     -61
usage_to_string                                       64       -     -64
volume_id_probe_linux_swap                           263     198     -65
volume_id_get_buffer                                 372     307     -65
volume_id_probe_iso9660                              412     332     -80
volume_id_probe_hfs_hfsplus                          888     806     -82
volume_id_probe_ntfs                                 396     294    -102
volume_id_probe_vfat                                 980     872    -108
volume_id_probe_reiserfs                             417     268    -149
dev_get_major_minor                                  175       -    -175
uuidcache_check_device                               692     499    -193
volume_id_probe_mac_partition_map                    697       -    -697
------------------------------------------------------------------------------
(add/remove: 2/6 grow/shrink: 8/39 up/down: 326/-2836)      Total: -2510 bytes
   text    data     bss     dec     hex filename
 797220     662    7420  805302   c49b6 busybox_old
 794244     662    7420  802326   c3e16 busybox_unstripped
2008-03-17 09:21:26 +00:00

120 lines
3.3 KiB
C

/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "volume_id_internal.h"
#define ISO_SUPERBLOCK_OFFSET 0x8000
#define ISO_SECTOR_SIZE 0x800
#define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
#define ISO_VD_PRIMARY 0x1
#define ISO_VD_SUPPLEMENTARY 0x2
#define ISO_VD_END 0xff
#define ISO_VD_MAX 16
struct iso_volume_descriptor {
uint8_t vd_type;
uint8_t vd_id[5];
uint8_t vd_version;
uint8_t flags;
uint8_t system_id[32];
uint8_t volume_id[32];
uint8_t unused[8];
uint8_t space_size[8];
uint8_t escape_sequences[8];
} __attribute__((__packed__));
struct high_sierra_volume_descriptor {
uint8_t foo[8];
uint8_t type;
uint8_t id[4];
uint8_t version;
} __attribute__((__packed__));
int volume_id_probe_iso9660(struct volume_id *id, uint64_t off)
{
uint8_t *buf;
struct iso_volume_descriptor *is;
struct high_sierra_volume_descriptor *hs;
dbg("probing at offset 0x%llx", (unsigned long long) off);
buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
if (buf == NULL)
return -1;
is = (struct iso_volume_descriptor *) buf;
if (memcmp(is->vd_id, "CD001", 5) == 0) {
int vd_offset;
int i;
dbg("read label from PVD");
// volume_id_set_label_raw(id, is->volume_id, 32);
volume_id_set_label_string(id, is->volume_id, 32);
dbg("looking for SVDs");
vd_offset = ISO_VD_OFFSET;
for (i = 0; i < ISO_VD_MAX; i++) {
uint8_t svd_label[64];
is = volume_id_get_buffer(id, off + vd_offset, 0x200);
if (is == NULL || is->vd_type == ISO_VD_END)
break;
if (is->vd_type != ISO_VD_SUPPLEMENTARY)
continue;
dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
if (memcmp(is->escape_sequences, "%/@", 3) == 0
|| memcmp(is->escape_sequences, "%/C", 3) == 0
|| memcmp(is->escape_sequences, "%/E", 3) == 0
) {
dbg("Joliet extension found");
volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
if (memcmp(id->label, svd_label, 16) == 0) {
dbg("SVD label is identical, use the possibly longer PVD one");
break;
}
// volume_id_set_label_raw(id, is->volume_id, 32);
volume_id_set_label_string(id, svd_label, 32);
// strcpy(id->type_version, "Joliet Extension");
goto found;
}
vd_offset += ISO_SECTOR_SIZE;
}
goto found;
}
hs = (struct high_sierra_volume_descriptor *) buf;
if (memcmp(hs->id, "CDROM", 5) == 0) {
// strcpy(id->type_version, "High Sierra");
goto found;
}
return -1;
found:
// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
// id->type = "iso9660";
return 0;
}