2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_HFS) += hfs.o
24 //config:config FEATURE_VOLUMEID_HFS
25 //config: bool "hfs filesystem"
27 //config: depends on VOLUMEID
32 #include "volume_id_internal.h"
34 struct hfs_finder_info
{
63 uint32_t xt_clump_size
;
64 uint32_t ct_clump_size
;
65 uint16_t num_root_dirs
;
68 struct hfs_finder_info finder_info
;
70 uint16_t embed_startblock
;
71 uint16_t embed_blockcount
;
74 struct hfsplus_bnode_descriptor
{
83 struct hfsplus_bheader_record
{
92 struct hfsplus_catalog_key
{
96 uint8_t unicode
[255 * 2];
99 struct hfsplus_extent
{
100 uint32_t start_block
;
101 uint32_t block_count
;
104 #define HFSPLUS_EXTENT_COUNT 8
105 struct hfsplus_fork
{
108 uint32_t total_blocks
;
109 struct hfsplus_extent extents
[HFSPLUS_EXTENT_COUNT
];
112 struct hfsplus_vol_header
{
113 uint8_t signature
[2];
116 uint32_t last_mount_vers
;
118 uint32_t create_date
;
119 uint32_t modify_date
;
120 uint32_t backup_date
;
121 uint32_t checked_date
;
123 uint32_t folder_count
;
125 uint32_t total_blocks
;
126 uint32_t free_blocks
;
128 uint32_t rsrc_clump_sz
;
129 uint32_t data_clump_sz
;
131 uint32_t write_count
;
132 uint64_t encodings_bmp
;
133 struct hfs_finder_info finder_info
;
134 struct hfsplus_fork alloc_file
;
135 struct hfsplus_fork ext_file
;
136 struct hfsplus_fork cat_file
;
137 struct hfsplus_fork attr_file
;
138 struct hfsplus_fork start_file
;
141 #define HFS_SUPERBLOCK_OFFSET 0x400
142 #define HFS_NODE_LEAF 0xff
143 #define HFSPLUS_POR_CNID 1
145 static void FAST_FUNC
hfs_set_uuid(struct volume_id
*id
, const uint8_t *hfs_id
)
152 for (i
= 0; i
< hfs_id_len
; i
++)
158 md5_hash(&md5c
, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
159 md5_hash(&md5c
, hfs_id
, hfs_id_len
);
160 md5_end(&md5c
, uuid
);
161 uuid
[6] = 0x30 | (uuid
[6] & 0x0f);
162 uuid
[8] = 0x80 | (uuid
[8] & 0x3f);
163 volume_id_set_uuid(id
, uuid
, UUID_DCE
);
166 int FAST_FUNC
volume_id_probe_hfs_hfsplus(struct volume_id
*id
/*,uint64_t off*/)
171 unsigned ext_block_start
;
172 unsigned ext_block_count
;
174 unsigned leaf_node_head
;
175 unsigned leaf_node_count
;
176 unsigned leaf_node_size
;
179 unsigned alloc_block_size
;
180 unsigned alloc_first_block
;
181 unsigned embed_first_block
;
182 unsigned record_count
;
183 struct hfsplus_vol_header
*hfsplus
;
184 struct hfsplus_bnode_descriptor
*descr
;
185 struct hfsplus_bheader_record
*bnode
;
186 struct hfsplus_catalog_key
*key
;
188 struct hfsplus_extent extents
[HFSPLUS_EXTENT_COUNT
];
192 dbg("probing at offset 0x%llx", (unsigned long long) off
);
194 buf
= volume_id_get_buffer(id
, off
+ HFS_SUPERBLOCK_OFFSET
, 0x200);
198 hfs
= (struct hfs_mdb
*) buf
;
199 if (hfs
->signature
[0] != 'B' || hfs
->signature
[1] != 'D')
202 /* it may be just a hfs wrapper for hfs+ */
203 if (hfs
->embed_sig
[0] == 'H' && hfs
->embed_sig
[1] == '+') {
204 alloc_block_size
= be32_to_cpu(hfs
->al_blk_size
);
205 dbg("alloc_block_size 0x%x", alloc_block_size
);
207 alloc_first_block
= be16_to_cpu(hfs
->al_bl_st
);
208 dbg("alloc_first_block 0x%x", alloc_first_block
);
210 embed_first_block
= be16_to_cpu(hfs
->embed_startblock
);
211 dbg("embed_first_block 0x%x", embed_first_block
);
213 off
+= (alloc_first_block
* 512) +
214 (embed_first_block
* alloc_block_size
);
215 dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off
);
217 buf
= volume_id_get_buffer(id
, off
+ HFS_SUPERBLOCK_OFFSET
, 0x200);
223 if (hfs
->label_len
> 0 && hfs
->label_len
< 28) {
224 // volume_id_set_label_raw(id, hfs->label, hfs->label_len);
225 volume_id_set_label_string(id
, hfs
->label
, hfs
->label_len
) ;
228 hfs_set_uuid(id
, hfs
->finder_info
.id
);
229 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
230 IF_FEATURE_BLKID_TYPE(id
->type
= "hfs";)
235 hfsplus
= (struct hfsplus_vol_header
*) buf
;
236 if (hfs
->signature
[0] == 'H')
237 if (hfs
->signature
[1] == '+' || hfs
->signature
[1] == 'X')
242 hfs_set_uuid(id
, hfsplus
->finder_info
.id
);
244 blocksize
= be32_to_cpu(hfsplus
->blocksize
);
245 dbg("blocksize %u", blocksize
);
247 memcpy(extents
, hfsplus
->cat_file
.extents
, sizeof(extents
));
248 cat_block
= be32_to_cpu(extents
[0].start_block
);
249 dbg("catalog start block 0x%x", cat_block
);
251 buf
= volume_id_get_buffer(id
, off
+ (cat_block
* blocksize
), 0x2000);
255 bnode
= (struct hfsplus_bheader_record
*)
256 &buf
[sizeof(struct hfsplus_bnode_descriptor
)];
258 leaf_node_head
= be32_to_cpu(bnode
->leaf_head
);
259 dbg("catalog leaf node 0x%x", leaf_node_head
);
261 leaf_node_size
= be16_to_cpu(bnode
->node_size
);
262 dbg("leaf node size 0x%x", leaf_node_size
);
264 leaf_node_count
= be32_to_cpu(bnode
->leaf_count
);
265 dbg("leaf node count 0x%x", leaf_node_count
);
266 if (leaf_node_count
== 0)
269 leaf_block
= (leaf_node_head
* leaf_node_size
) / blocksize
;
271 /* get physical location */
272 for (ext
= 0; ext
< HFSPLUS_EXTENT_COUNT
; ext
++) {
273 ext_block_start
= be32_to_cpu(extents
[ext
].start_block
);
274 ext_block_count
= be32_to_cpu(extents
[ext
].block_count
);
275 dbg("extent start block 0x%x, count 0x%x", ext_block_start
, ext_block_count
);
277 if (ext_block_count
== 0)
280 /* this is our extent */
281 if (leaf_block
< ext_block_count
)
284 leaf_block
-= ext_block_count
;
286 if (ext
== HFSPLUS_EXTENT_COUNT
)
288 dbg("found block in extent %i", ext
);
290 leaf_off
= (ext_block_start
+ leaf_block
) * blocksize
;
292 buf
= volume_id_get_buffer(id
, off
+ leaf_off
, leaf_node_size
);
296 descr
= (struct hfsplus_bnode_descriptor
*) buf
;
297 dbg("descriptor type 0x%x", descr
->type
);
299 record_count
= be16_to_cpu(descr
->num_recs
);
300 dbg("number of records %u", record_count
);
301 if (record_count
== 0)
304 if (descr
->type
!= HFS_NODE_LEAF
)
307 key
= (struct hfsplus_catalog_key
*)
308 &buf
[sizeof(struct hfsplus_bnode_descriptor
)];
310 dbg("parent id 0x%x", be32_to_cpu(key
->parent_id
));
311 if (key
->parent_id
!= cpu_to_be32(HFSPLUS_POR_CNID
))
314 label_len
= be16_to_cpu(key
->unicode_len
) * 2;
315 dbg("label unicode16 len %i", label_len
);
316 // volume_id_set_label_raw(id, key->unicode, label_len);
317 volume_id_set_label_unicode16(id
, key
->unicode
, BE
, label_len
);
320 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
321 IF_FEATURE_BLKID_TYPE(id
->type
= "hfsplus";)