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 #include "volume_id_internal.h"
23 struct hfs_finder_info{
31 } __attribute__((__packed__));
52 uint32_t xt_clump_size;
53 uint32_t ct_clump_size;
54 uint16_t num_root_dirs;
57 struct hfs_finder_info finder_info;
59 uint16_t embed_startblock;
60 uint16_t embed_blockcount;
61 } __attribute__((__packed__));
63 struct hfsplus_bnode_descriptor {
70 } __attribute__((__packed__));
72 struct hfsplus_bheader_record {
79 } __attribute__((__packed__));
81 struct hfsplus_catalog_key {
85 uint8_t unicode[255 * 2];
86 } __attribute__((__packed__));
88 struct hfsplus_extent {
91 } __attribute__((__packed__));
93 #define HFSPLUS_EXTENT_COUNT 8
97 uint32_t total_blocks;
98 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
99 } __attribute__((__packed__));
101 struct hfsplus_vol_header {
102 uint8_t signature[2];
105 uint32_t last_mount_vers;
107 uint32_t create_date;
108 uint32_t modify_date;
109 uint32_t backup_date;
110 uint32_t checked_date;
112 uint32_t folder_count;
114 uint32_t total_blocks;
115 uint32_t free_blocks;
117 uint32_t rsrc_clump_sz;
118 uint32_t data_clump_sz;
120 uint32_t write_count;
121 uint64_t encodings_bmp;
122 struct hfs_finder_info finder_info;
123 struct hfsplus_fork alloc_file;
124 struct hfsplus_fork ext_file;
125 struct hfsplus_fork cat_file;
126 struct hfsplus_fork attr_file;
127 struct hfsplus_fork start_file;
128 } __attribute__((__packed__));
130 #define HFS_SUPERBLOCK_OFFSET 0x400
131 #define HFS_NODE_LEAF 0xff
132 #define HFSPLUS_POR_CNID 1
134 int volume_id_probe_hfs_hfsplus(struct volume_id *id, uint64_t off)
138 unsigned ext_block_start;
139 unsigned ext_block_count;
141 unsigned leaf_node_head;
142 unsigned leaf_node_count;
143 unsigned leaf_node_size;
146 unsigned alloc_block_size;
147 unsigned alloc_first_block;
148 unsigned embed_first_block;
149 unsigned record_count;
150 struct hfsplus_vol_header *hfsplus;
151 struct hfsplus_bnode_descriptor *descr;
152 struct hfsplus_bheader_record *bnode;
153 struct hfsplus_catalog_key *key;
155 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
159 dbg("probing at offset 0x%llx", (unsigned long long) off);
161 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
165 hfs = (struct hfs_mdb *) buf;
166 if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
169 /* it may be just a hfs wrapper for hfs+ */
170 if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
171 alloc_block_size = be32_to_cpu(hfs->al_blk_size);
172 dbg("alloc_block_size 0x%x", alloc_block_size);
174 alloc_first_block = be16_to_cpu(hfs->al_bl_st);
175 dbg("alloc_first_block 0x%x", alloc_first_block);
177 embed_first_block = be16_to_cpu(hfs->embed_startblock);
178 dbg("embed_first_block 0x%x", embed_first_block);
180 off += (alloc_first_block * 512) +
181 (embed_first_block * alloc_block_size);
182 dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
184 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
190 if (hfs->label_len > 0 && hfs->label_len < 28) {
191 // volume_id_set_label_raw(id, hfs->label, hfs->label_len);
192 volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
195 volume_id_set_uuid(id, hfs->finder_info.id, UUID_HFS);
196 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
202 hfsplus = (struct hfsplus_vol_header *) buf;
203 if (hfs->signature[0] == 'H')
204 if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
209 volume_id_set_uuid(id, hfsplus->finder_info.id, UUID_HFS);
211 blocksize = be32_to_cpu(hfsplus->blocksize);
212 dbg("blocksize %u", blocksize);
214 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
215 cat_block = be32_to_cpu(extents[0].start_block);
216 dbg("catalog start block 0x%x", cat_block);
218 buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
222 bnode = (struct hfsplus_bheader_record *)
223 &buf[sizeof(struct hfsplus_bnode_descriptor)];
225 leaf_node_head = be32_to_cpu(bnode->leaf_head);
226 dbg("catalog leaf node 0x%x", leaf_node_head);
228 leaf_node_size = be16_to_cpu(bnode->node_size);
229 dbg("leaf node size 0x%x", leaf_node_size);
231 leaf_node_count = be32_to_cpu(bnode->leaf_count);
232 dbg("leaf node count 0x%x", leaf_node_count);
233 if (leaf_node_count == 0)
236 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
238 /* get physical location */
239 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
240 ext_block_start = be32_to_cpu(extents[ext].start_block);
241 ext_block_count = be32_to_cpu(extents[ext].block_count);
242 dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
244 if (ext_block_count == 0)
247 /* this is our extent */
248 if (leaf_block < ext_block_count)
251 leaf_block -= ext_block_count;
253 if (ext == HFSPLUS_EXTENT_COUNT)
255 dbg("found block in extent %i", ext);
257 leaf_off = (ext_block_start + leaf_block) * blocksize;
259 buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
263 descr = (struct hfsplus_bnode_descriptor *) buf;
264 dbg("descriptor type 0x%x", descr->type);
266 record_count = be16_to_cpu(descr->num_recs);
267 dbg("number of records %u", record_count);
268 if (record_count == 0)
271 if (descr->type != HFS_NODE_LEAF)
274 key = (struct hfsplus_catalog_key *)
275 &buf[sizeof(struct hfsplus_bnode_descriptor)];
277 dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
278 if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
281 label_len = be16_to_cpu(key->unicode_len) * 2;
282 dbg("label unicode16 len %i", label_len);
283 // volume_id_set_label_raw(id, key->unicode, label_len);
284 volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
287 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
288 // id->type = "hfsplus";