chiark / gitweb /
remove no longer needed includes
[elogind.git] / extras / volume_id / volume_id / mac.c
1 /*
2  * volume_id - reads filesystem label and uuid
3  *
4  * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5  *
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.
10  *
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.
15  *
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
19  */
20
21 #ifndef _GNU_SOURCE
22 #define _GNU_SOURCE 1
23 #endif
24
25 #ifdef HAVE_CONFIG_H
26 #  include <config.h>
27 #endif
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <errno.h>
34 #include <ctype.h>
35
36 #include "volume_id.h"
37 #include "logging.h"
38 #include "util.h"
39 #include "mac.h"
40
41 struct mac_driver_desc {
42         uint8_t         signature[2];
43         uint16_t        block_size;
44         uint32_t        block_count;
45 } __attribute__((__packed__));
46
47 struct mac_partition {
48         uint8_t         signature[2];
49         uint16_t        res1;
50         uint32_t        map_count;
51         uint32_t        start_block;
52         uint32_t        block_count;
53         uint8_t         name[32];
54         uint8_t         type[32];
55 } __attribute__((__packed__));
56
57 int volume_id_probe_mac_partition_map(struct volume_id *id, uint64_t off)
58 {
59         const uint8_t *buf;
60         struct mac_driver_desc *driver;
61         struct mac_partition *part;
62
63         dbg("probing at offset 0x%llx", (unsigned long long) off);
64
65         buf = volume_id_get_buffer(id, off, 0x200);
66         if (buf == NULL)
67                 return -1;
68
69         part = (struct mac_partition *) buf;
70         if ((memcmp(part->signature, "PM", 2) == 0) &&
71             (memcmp(part->type, "Apple_partition_map", 19) == 0)) {
72                 /* linux creates an own subdevice for the map
73                  * just return the type if the drive header is missing */
74                 volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
75                 id->type = "mac_partition_map";
76                 return 0;
77         }
78
79         driver = (struct mac_driver_desc *) buf;
80         if (memcmp(driver->signature, "ER", 2) == 0) {
81                 /* we are on a main device, like a CD
82                  * just try to probe the first partition from the map */
83                 unsigned int bsize = be16_to_cpu(driver->block_size);
84                 int part_count;
85                 int i;
86
87                 /* get first entry of partition table */
88                 buf = volume_id_get_buffer(id, off +  bsize, 0x200);
89                 if (buf == NULL)
90                         return -1;
91
92                 part = (struct mac_partition *) buf;
93                 if (memcmp(part->signature, "PM", 2) != 0)
94                         return -1;
95
96                 part_count = be32_to_cpu(part->map_count);
97                 dbg("expecting %d partition entries", part_count);
98
99                 if (id->partitions != NULL)
100                         free(id->partitions);
101                 id->partitions =
102                         malloc(part_count * sizeof(struct volume_id_partition));
103                 if (id->partitions == NULL)
104                         return -1;
105                 memset(id->partitions, 0x00, sizeof(struct volume_id_partition));
106
107                 id->partition_count = part_count;
108
109                 for (i = 0; i < part_count; i++) {
110                         uint64_t poff;
111                         uint64_t plen;
112
113                         buf = volume_id_get_buffer(id, off + ((i+1) * bsize), 0x200);
114                         if (buf == NULL)
115                                 return -1;
116
117                         part = (struct mac_partition *) buf;
118                         if (memcmp(part->signature, "PM", 2) != 0)
119                                 return -1;
120
121                         poff = be32_to_cpu(part->start_block) * bsize;
122                         plen = be32_to_cpu(part->block_count) * bsize;
123                         dbg("found '%s' partition entry at 0x%llx, len 0x%llx",
124                             part->type, (unsigned long long) poff, (unsigned long long) plen);
125
126                         id->partitions[i].off = poff;
127                         id->partitions[i].len = plen;
128
129                         if (memcmp(part->type, "Apple_Free", 10) == 0) {
130                                 volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNUSED);
131                         } else if (memcmp(part->type, "Apple_partition_map", 19) == 0) {
132                                 volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_PARTITIONTABLE);
133                         } else {
134                                 volume_id_set_usage_part(&id->partitions[i], VOLUME_ID_UNPROBED);
135                         }
136                 }
137                 volume_id_set_usage(id, VOLUME_ID_PARTITIONTABLE);
138                 id->type = "mac_partition_map";
139                 return 0;
140         }
141
142         return -1;
143 }