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21#include "volume_id_internal.h"
22
23struct hfs_finder_info{
24 uint32_t boot_folder;
25 uint32_t start_app;
26 uint32_t open_folder;
27 uint32_t os9_folder;
28 uint32_t reserved;
29 uint32_t osx_folder;
30 uint8_t id[8];
31} PACKED;
32
33struct hfs_mdb {
34 uint8_t signature[2];
35 uint32_t cr_date;
36 uint32_t ls_Mod;
37 uint16_t atrb;
38 uint16_t nm_fls;
39 uint16_t vbm_st;
40 uint16_t alloc_ptr;
41 uint16_t nm_al_blks;
42 uint32_t al_blk_size;
43 uint32_t clp_size;
44 uint16_t al_bl_st;
45 uint32_t nxt_cnid;
46 uint16_t free_bks;
47 uint8_t label_len;
48 uint8_t label[27];
49 uint32_t vol_bkup;
50 uint16_t vol_seq_num;
51 uint32_t wr_cnt;
52 uint32_t xt_clump_size;
53 uint32_t ct_clump_size;
54 uint16_t num_root_dirs;
55 uint32_t file_count;
56 uint32_t dir_count;
57 struct hfs_finder_info finder_info;
58 uint8_t embed_sig[2];
59 uint16_t embed_startblock;
60 uint16_t embed_blockcount;
61} PACKED;
62
63struct hfsplus_bnode_descriptor {
64 uint32_t next;
65 uint32_t prev;
66 uint8_t type;
67 uint8_t height;
68 uint16_t num_recs;
69 uint16_t reserved;
70} PACKED;
71
72struct hfsplus_bheader_record {
73 uint16_t depth;
74 uint32_t root;
75 uint32_t leaf_count;
76 uint32_t leaf_head;
77 uint32_t leaf_tail;
78 uint16_t node_size;
79} PACKED;
80
81struct hfsplus_catalog_key {
82 uint16_t key_len;
83 uint32_t parent_id;
84 uint16_t unicode_len;
85 uint8_t unicode[255 * 2];
86} PACKED;
87
88struct hfsplus_extent {
89 uint32_t start_block;
90 uint32_t block_count;
91} PACKED;
92
93#define HFSPLUS_EXTENT_COUNT 8
94struct hfsplus_fork {
95 uint64_t total_size;
96 uint32_t clump_size;
97 uint32_t total_blocks;
98 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
99} PACKED;
100
101struct hfsplus_vol_header {
102 uint8_t signature[2];
103 uint16_t version;
104 uint32_t attributes;
105 uint32_t last_mount_vers;
106 uint32_t reserved;
107 uint32_t create_date;
108 uint32_t modify_date;
109 uint32_t backup_date;
110 uint32_t checked_date;
111 uint32_t file_count;
112 uint32_t folder_count;
113 uint32_t blocksize;
114 uint32_t total_blocks;
115 uint32_t free_blocks;
116 uint32_t next_alloc;
117 uint32_t rsrc_clump_sz;
118 uint32_t data_clump_sz;
119 uint32_t next_cnid;
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} PACKED;
129
130#define HFS_SUPERBLOCK_OFFSET 0x400
131#define HFS_NODE_LEAF 0xff
132#define HFSPLUS_POR_CNID 1
133
134static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
135{
136#define hfs_id_len 8
137 md5_ctx_t md5c;
138 uint8_t uuid[16];
139 unsigned i;
140
141 for (i = 0; i < hfs_id_len; i++)
142 if (hfs_id[i] != 0)
143 goto do_md5;
144 return;
145 do_md5:
146 md5_begin(&md5c);
147 md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
148 md5_hash(&md5c, hfs_id, hfs_id_len);
149 md5_end(&md5c, uuid);
150 uuid[6] = 0x30 | (uuid[6] & 0x0f);
151 uuid[8] = 0x80 | (uuid[8] & 0x3f);
152 volume_id_set_uuid(id, uuid, UUID_DCE);
153}
154
155int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id )
156{
157 uint64_t off = 0;
158 unsigned blocksize;
159 unsigned cat_block;
160 unsigned ext_block_start;
161 unsigned ext_block_count;
162 int ext;
163 unsigned leaf_node_head;
164 unsigned leaf_node_count;
165 unsigned leaf_node_size;
166 unsigned leaf_block;
167 uint64_t leaf_off;
168 unsigned alloc_block_size;
169 unsigned alloc_first_block;
170 unsigned embed_first_block;
171 unsigned record_count;
172 struct hfsplus_vol_header *hfsplus;
173 struct hfsplus_bnode_descriptor *descr;
174 struct hfsplus_bheader_record *bnode;
175 struct hfsplus_catalog_key *key;
176 unsigned label_len;
177 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
178 struct hfs_mdb *hfs;
179 const uint8_t *buf;
180
181 dbg("probing at offset 0x%llx", (unsigned long long) off);
182
183 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
184 if (buf == NULL)
185 return -1;
186
187 hfs = (struct hfs_mdb *) buf;
188 if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
189 goto checkplus;
190
191
192 if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
193 alloc_block_size = be32_to_cpu(hfs->al_blk_size);
194 dbg("alloc_block_size 0x%x", alloc_block_size);
195
196 alloc_first_block = be16_to_cpu(hfs->al_bl_st);
197 dbg("alloc_first_block 0x%x", alloc_first_block);
198
199 embed_first_block = be16_to_cpu(hfs->embed_startblock);
200 dbg("embed_first_block 0x%x", embed_first_block);
201
202 off += (alloc_first_block * 512) +
203 (embed_first_block * alloc_block_size);
204 dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
205
206 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
207 if (buf == NULL)
208 return -1;
209 goto checkplus;
210 }
211
212 if (hfs->label_len > 0 && hfs->label_len < 28) {
213
214 volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
215 }
216
217 hfs_set_uuid(id, hfs->finder_info.id);
218
219 IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
220
221 return 0;
222
223 checkplus:
224 hfsplus = (struct hfsplus_vol_header *) buf;
225 if (hfs->signature[0] == 'H')
226 if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
227 goto hfsplus;
228 return -1;
229
230 hfsplus:
231 hfs_set_uuid(id, hfsplus->finder_info.id);
232
233 blocksize = be32_to_cpu(hfsplus->blocksize);
234 dbg("blocksize %u", blocksize);
235
236 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
237 cat_block = be32_to_cpu(extents[0].start_block);
238 dbg("catalog start block 0x%x", cat_block);
239
240 buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
241 if (buf == NULL)
242 goto found;
243
244 bnode = (struct hfsplus_bheader_record *)
245 &buf[sizeof(struct hfsplus_bnode_descriptor)];
246
247 leaf_node_head = be32_to_cpu(bnode->leaf_head);
248 dbg("catalog leaf node 0x%x", leaf_node_head);
249
250 leaf_node_size = be16_to_cpu(bnode->node_size);
251 dbg("leaf node size 0x%x", leaf_node_size);
252
253 leaf_node_count = be32_to_cpu(bnode->leaf_count);
254 dbg("leaf node count 0x%x", leaf_node_count);
255 if (leaf_node_count == 0)
256 goto found;
257
258 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
259
260
261 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
262 ext_block_start = be32_to_cpu(extents[ext].start_block);
263 ext_block_count = be32_to_cpu(extents[ext].block_count);
264 dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
265
266 if (ext_block_count == 0)
267 goto found;
268
269
270 if (leaf_block < ext_block_count)
271 break;
272
273 leaf_block -= ext_block_count;
274 }
275 if (ext == HFSPLUS_EXTENT_COUNT)
276 goto found;
277 dbg("found block in extent %i", ext);
278
279 leaf_off = (ext_block_start + leaf_block) * blocksize;
280
281 buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
282 if (buf == NULL)
283 goto found;
284
285 descr = (struct hfsplus_bnode_descriptor *) buf;
286 dbg("descriptor type 0x%x", descr->type);
287
288 record_count = be16_to_cpu(descr->num_recs);
289 dbg("number of records %u", record_count);
290 if (record_count == 0)
291 goto found;
292
293 if (descr->type != HFS_NODE_LEAF)
294 goto found;
295
296 key = (struct hfsplus_catalog_key *)
297 &buf[sizeof(struct hfsplus_bnode_descriptor)];
298
299 dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
300 if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
301 goto found;
302
303 label_len = be16_to_cpu(key->unicode_len) * 2;
304 dbg("label unicode16 len %i", label_len);
305
306 volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
307
308 found:
309
310 IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
311
312 return 0;
313}
314
