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27#include "volume_id_internal.h"
28
29struct hfs_finder_info{
30 uint32_t boot_folder;
31 uint32_t start_app;
32 uint32_t open_folder;
33 uint32_t os9_folder;
34 uint32_t reserved;
35 uint32_t osx_folder;
36 uint8_t id[8];
37} PACKED;
38
39struct hfs_mdb {
40 uint8_t signature[2];
41 uint32_t cr_date;
42 uint32_t ls_Mod;
43 uint16_t atrb;
44 uint16_t nm_fls;
45 uint16_t vbm_st;
46 uint16_t alloc_ptr;
47 uint16_t nm_al_blks;
48 uint32_t al_blk_size;
49 uint32_t clp_size;
50 uint16_t al_bl_st;
51 uint32_t nxt_cnid;
52 uint16_t free_bks;
53 uint8_t label_len;
54 uint8_t label[27];
55 uint32_t vol_bkup;
56 uint16_t vol_seq_num;
57 uint32_t wr_cnt;
58 uint32_t xt_clump_size;
59 uint32_t ct_clump_size;
60 uint16_t num_root_dirs;
61 uint32_t file_count;
62 uint32_t dir_count;
63 struct hfs_finder_info finder_info;
64 uint8_t embed_sig[2];
65 uint16_t embed_startblock;
66 uint16_t embed_blockcount;
67} PACKED;
68
69struct hfsplus_bnode_descriptor {
70 uint32_t next;
71 uint32_t prev;
72 uint8_t type;
73 uint8_t height;
74 uint16_t num_recs;
75 uint16_t reserved;
76} PACKED;
77
78struct hfsplus_bheader_record {
79 uint16_t depth;
80 uint32_t root;
81 uint32_t leaf_count;
82 uint32_t leaf_head;
83 uint32_t leaf_tail;
84 uint16_t node_size;
85} PACKED;
86
87struct hfsplus_catalog_key {
88 uint16_t key_len;
89 uint32_t parent_id;
90 uint16_t unicode_len;
91 uint8_t unicode[255 * 2];
92} PACKED;
93
94struct hfsplus_extent {
95 uint32_t start_block;
96 uint32_t block_count;
97} PACKED;
98
99#define HFSPLUS_EXTENT_COUNT 8
100struct hfsplus_fork {
101 uint64_t total_size;
102 uint32_t clump_size;
103 uint32_t total_blocks;
104 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
105} PACKED;
106
107struct hfsplus_vol_header {
108 uint8_t signature[2];
109 uint16_t version;
110 uint32_t attributes;
111 uint32_t last_mount_vers;
112 uint32_t reserved;
113 uint32_t create_date;
114 uint32_t modify_date;
115 uint32_t backup_date;
116 uint32_t checked_date;
117 uint32_t file_count;
118 uint32_t folder_count;
119 uint32_t blocksize;
120 uint32_t total_blocks;
121 uint32_t free_blocks;
122 uint32_t next_alloc;
123 uint32_t rsrc_clump_sz;
124 uint32_t data_clump_sz;
125 uint32_t next_cnid;
126 uint32_t write_count;
127 uint64_t encodings_bmp;
128 struct hfs_finder_info finder_info;
129 struct hfsplus_fork alloc_file;
130 struct hfsplus_fork ext_file;
131 struct hfsplus_fork cat_file;
132 struct hfsplus_fork attr_file;
133 struct hfsplus_fork start_file;
134} PACKED;
135
136#define HFS_SUPERBLOCK_OFFSET 0x400
137#define HFS_NODE_LEAF 0xff
138#define HFSPLUS_POR_CNID 1
139
140static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
141{
142#define hfs_id_len 8
143 md5_ctx_t md5c;
144 uint8_t uuid[16];
145 unsigned i;
146
147 for (i = 0; i < hfs_id_len; i++)
148 if (hfs_id[i] != 0)
149 goto do_md5;
150 return;
151 do_md5:
152 md5_begin(&md5c);
153 md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
154 md5_hash(&md5c, hfs_id, hfs_id_len);
155 md5_end(&md5c, uuid);
156 uuid[6] = 0x30 | (uuid[6] & 0x0f);
157 uuid[8] = 0x80 | (uuid[8] & 0x3f);
158 volume_id_set_uuid(id, uuid, UUID_DCE);
159}
160
161int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id )
162{
163 uint64_t off = 0;
164 unsigned blocksize;
165 unsigned cat_block;
166 unsigned ext_block_start;
167 unsigned ext_block_count;
168 int ext;
169 unsigned leaf_node_head;
170 unsigned leaf_node_count;
171 unsigned leaf_node_size;
172 unsigned leaf_block;
173 uint64_t leaf_off;
174 unsigned alloc_block_size;
175 unsigned alloc_first_block;
176 unsigned embed_first_block;
177 unsigned record_count;
178 struct hfsplus_vol_header *hfsplus;
179 struct hfsplus_bnode_descriptor *descr;
180 struct hfsplus_bheader_record *bnode;
181 struct hfsplus_catalog_key *key;
182 unsigned label_len;
183 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
184 struct hfs_mdb *hfs;
185 const uint8_t *buf;
186
187 dbg("probing at offset 0x%llx", (unsigned long long) off);
188
189 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
190 if (buf == NULL)
191 return -1;
192
193 hfs = (struct hfs_mdb *) buf;
194 if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
195 goto checkplus;
196
197
198 if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
199 alloc_block_size = be32_to_cpu(hfs->al_blk_size);
200 dbg("alloc_block_size 0x%x", alloc_block_size);
201
202 alloc_first_block = be16_to_cpu(hfs->al_bl_st);
203 dbg("alloc_first_block 0x%x", alloc_first_block);
204
205 embed_first_block = be16_to_cpu(hfs->embed_startblock);
206 dbg("embed_first_block 0x%x", embed_first_block);
207
208 off += (alloc_first_block * 512) +
209 (embed_first_block * alloc_block_size);
210 dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
211
212 buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
213 if (buf == NULL)
214 return -1;
215 goto checkplus;
216 }
217
218 if (hfs->label_len > 0 && hfs->label_len < 28) {
219
220 volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
221 }
222
223 hfs_set_uuid(id, hfs->finder_info.id);
224
225 IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
226
227 return 0;
228
229 checkplus:
230 hfsplus = (struct hfsplus_vol_header *) buf;
231 if (hfs->signature[0] == 'H')
232 if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
233 goto hfsplus;
234 return -1;
235
236 hfsplus:
237 hfs_set_uuid(id, hfsplus->finder_info.id);
238
239 blocksize = be32_to_cpu(hfsplus->blocksize);
240 dbg("blocksize %u", blocksize);
241
242 memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
243 cat_block = be32_to_cpu(extents[0].start_block);
244 dbg("catalog start block 0x%x", cat_block);
245
246 buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
247 if (buf == NULL)
248 goto found;
249
250 bnode = (struct hfsplus_bheader_record *)
251 &buf[sizeof(struct hfsplus_bnode_descriptor)];
252
253 leaf_node_head = be32_to_cpu(bnode->leaf_head);
254 dbg("catalog leaf node 0x%x", leaf_node_head);
255
256 leaf_node_size = be16_to_cpu(bnode->node_size);
257 dbg("leaf node size 0x%x", leaf_node_size);
258
259 leaf_node_count = be32_to_cpu(bnode->leaf_count);
260 dbg("leaf node count 0x%x", leaf_node_count);
261 if (leaf_node_count == 0)
262 goto found;
263
264 leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
265
266
267 for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
268 ext_block_start = be32_to_cpu(extents[ext].start_block);
269 ext_block_count = be32_to_cpu(extents[ext].block_count);
270 dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
271
272 if (ext_block_count == 0)
273 goto found;
274
275
276 if (leaf_block < ext_block_count)
277 break;
278
279 leaf_block -= ext_block_count;
280 }
281 if (ext == HFSPLUS_EXTENT_COUNT)
282 goto found;
283 dbg("found block in extent %i", ext);
284
285 leaf_off = (ext_block_start + leaf_block) * blocksize;
286
287 buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
288 if (buf == NULL)
289 goto found;
290
291 descr = (struct hfsplus_bnode_descriptor *) buf;
292 dbg("descriptor type 0x%x", descr->type);
293
294 record_count = be16_to_cpu(descr->num_recs);
295 dbg("number of records %u", record_count);
296 if (record_count == 0)
297 goto found;
298
299 if (descr->type != HFS_NODE_LEAF)
300 goto found;
301
302 key = (struct hfsplus_catalog_key *)
303 &buf[sizeof(struct hfsplus_bnode_descriptor)];
304
305 dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
306 if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
307 goto found;
308
309 label_len = be16_to_cpu(key->unicode_len) * 2;
310 dbg("label unicode16 len %i", label_len);
311
312 volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
313
314 found:
315
316 IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
317
318 return 0;
319}
320
