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
23 //config:config FEATURE_VOLUMEID_HFS
24 //config: bool "hfs filesystem"
26 //config: depends on VOLUMEID
28 #include "volume_id_internal.h"
30 struct hfs_finder_info{
59 uint32_t xt_clump_size;
60 uint32_t ct_clump_size;
61 uint16_t num_root_dirs;
64 struct hfs_finder_info finder_info;
66 uint16_t embed_startblock;
67 uint16_t embed_blockcount;
70 struct hfsplus_bnode_descriptor {
79 struct hfsplus_bheader_record {
88 struct hfsplus_catalog_key {
92 uint8_t unicode[255 * 2];
95 struct hfsplus_extent {
100 #define HFSPLUS_EXTENT_COUNT 8
101 struct hfsplus_fork {
104 uint32_t total_blocks;
105 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
108 struct hfsplus_vol_header {
109 uint8_t signature[2];
112 uint32_t last_mount_vers;
114 uint32_t create_date;
115 uint32_t modify_date;
116 uint32_t backup_date;
117 uint32_t checked_date;
119 uint32_t folder_count;
121 uint32_t total_blocks;
122 uint32_t free_blocks;
124 uint32_t rsrc_clump_sz;
125 uint32_t data_clump_sz;
127 uint32_t write_count;
128 uint64_t encodings_bmp;
129 struct hfs_finder_info finder_info;
130 struct hfsplus_fork alloc_file;
131 struct hfsplus_fork ext_file;
132 struct hfsplus_fork cat_file;
133 struct hfsplus_fork attr_file;
134 struct hfsplus_fork start_file;
137 #define HFS_SUPERBLOCK_OFFSET 0x400
138 #define HFS_NODE_LEAF 0xff
139 #define HFSPLUS_POR_CNID 1
141 static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
148 for (i = 0; i < hfs_id_len; i++)
154 md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
155 md5_hash(&md5c, hfs_id, hfs_id_len);
156 md5_end(&md5c, uuid);
157 uuid[6] = 0x30 | (uuid[6] & 0x0f);
158 uuid[8] = 0x80 | (uuid[8] & 0x3f);
159 volume_id_set_uuid(id, uuid, UUID_DCE);
162 int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
167 unsigned ext_block_start;
168 unsigned ext_block_count;
170 unsigned leaf_node_head;
171 unsigned leaf_node_count;
172 unsigned leaf_node_size;
175 unsigned alloc_block_size;
176 unsigned alloc_first_block;
177 unsigned embed_first_block;
178 unsigned record_count;
179 struct hfsplus_vol_header *hfsplus;
180 struct hfsplus_bnode_descriptor *descr;
181 struct hfsplus_bheader_record *bnode;
182 struct hfsplus_catalog_key *key;
184 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
188 dbg("probing at offset 0x%llx", (unsigned long long) off);
190 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
194 hfs = (struct hfs_mdb *) buf;
195 if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
198 /* it may be just a hfs wrapper for hfs+ */
199 if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
200 alloc_block_size = be32_to_cpu(hfs->al_blk_size);
201 dbg("alloc_block_size 0x%x", alloc_block_size);
203 alloc_first_block = be16_to_cpu(hfs->al_bl_st);
204 dbg("alloc_first_block 0x%x", alloc_first_block);
206 embed_first_block = be16_to_cpu(hfs->embed_startblock);
207 dbg("embed_first_block 0x%x", embed_first_block);
209 off += (alloc_first_block * 512) +
210 (embed_first_block * alloc_block_size);
211 dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
213 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
219 if (hfs->label_len > 0 && hfs->label_len < 28) {
220 // volume_id_set_label_raw(id, hfs->label, hfs->label_len);
221 volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
224 hfs_set_uuid(id, hfs->finder_info.id);
225 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
226 IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
231 hfsplus = (struct hfsplus_vol_header *) buf;
232 if (hfs->signature[0] == 'H')
233 if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
238 hfs_set_uuid(id, hfsplus->finder_info.id);
240 blocksize = be32_to_cpu(hfsplus->blocksize);
241 dbg("blocksize %u", blocksize);
243 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
244 cat_block = be32_to_cpu(extents[0].start_block);
245 dbg("catalog start block 0x%x", cat_block);
247 buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
251 bnode = (struct hfsplus_bheader_record *)
252 &buf[sizeof(struct hfsplus_bnode_descriptor)];
254 leaf_node_head = be32_to_cpu(bnode->leaf_head);
255 dbg("catalog leaf node 0x%x", leaf_node_head);
257 leaf_node_size = be16_to_cpu(bnode->node_size);
258 dbg("leaf node size 0x%x", leaf_node_size);
260 leaf_node_count = be32_to_cpu(bnode->leaf_count);
261 dbg("leaf node count 0x%x", leaf_node_count);
262 if (leaf_node_count == 0)
265 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
267 /* get physical location */
268 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
269 ext_block_start = be32_to_cpu(extents[ext].start_block);
270 ext_block_count = be32_to_cpu(extents[ext].block_count);
271 dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
273 if (ext_block_count == 0)
276 /* this is our extent */
277 if (leaf_block < ext_block_count)
280 leaf_block -= ext_block_count;
282 if (ext == HFSPLUS_EXTENT_COUNT)
284 dbg("found block in extent %i", ext);
286 leaf_off = (ext_block_start + leaf_block) * blocksize;
288 buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
292 descr = (struct hfsplus_bnode_descriptor *) buf;
293 dbg("descriptor type 0x%x", descr->type);
295 record_count = be16_to_cpu(descr->num_recs);
296 dbg("number of records %u", record_count);
297 if (record_count == 0)
300 if (descr->type != HFS_NODE_LEAF)
303 key = (struct hfsplus_catalog_key *)
304 &buf[sizeof(struct hfsplus_bnode_descriptor)];
306 dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
307 if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
310 label_len = be16_to_cpu(key->unicode_len) * 2;
311 dbg("label unicode16 len %i", label_len);
312 // volume_id_set_label_raw(id, key->unicode, label_len);
313 volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
316 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
317 IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)