293 lines
7.7 KiB
C
293 lines
7.7 KiB
C
|
/*
|
||
|
|
* volume_id - reads filesystem label and uuid
|
||
|
|
*
|
||
|
|
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
|
||
|
|
*
|
||
|
|
* This library is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This library is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with this library; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "volume_id_internal.h"
|
||
|
|
|
||
|
|
struct hfs_finder_info{
|
||
|
|
uint32_t boot_folder;
|
||
|
|
uint32_t start_app;
|
||
|
|
uint32_t open_folder;
|
||
|
|
uint32_t os9_folder;
|
||
|
|
uint32_t reserved;
|
||
|
|
uint32_t osx_folder;
|
||
|
|
uint8_t id[8];
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
struct hfs_mdb {
|
||
|
|
uint8_t signature[2];
|
||
|
|
uint32_t cr_date;
|
||
|
|
uint32_t ls_Mod;
|
||
|
|
uint16_t atrb;
|
||
|
|
uint16_t nm_fls;
|
||
|
|
uint16_t vbm_st;
|
||
|
|
uint16_t alloc_ptr;
|
||
|
|
uint16_t nm_al_blks;
|
||
|
|
uint32_t al_blk_size;
|
||
|
|
uint32_t clp_size;
|
||
|
|
uint16_t al_bl_st;
|
||
|
|
uint32_t nxt_cnid;
|
||
|
|
uint16_t free_bks;
|
||
|
|
uint8_t label_len;
|
||
|
|
uint8_t label[27];
|
||
|
|
uint32_t vol_bkup;
|
||
|
|
uint16_t vol_seq_num;
|
||
|
|
uint32_t wr_cnt;
|
||
|
|
uint32_t xt_clump_size;
|
||
|
|
uint32_t ct_clump_size;
|
||
|
|
uint16_t num_root_dirs;
|
||
|
|
uint32_t file_count;
|
||
|
|
uint32_t dir_count;
|
||
|
|
struct hfs_finder_info finder_info;
|
||
|
|
uint8_t embed_sig[2];
|
||
|
|
uint16_t embed_startblock;
|
||
|
|
uint16_t embed_blockcount;
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
struct hfsplus_bnode_descriptor {
|
||
|
|
uint32_t next;
|
||
|
|
uint32_t prev;
|
||
|
|
uint8_t type;
|
||
|
|
uint8_t height;
|
||
|
|
uint16_t num_recs;
|
||
|
|
uint16_t reserved;
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
struct hfsplus_bheader_record {
|
||
|
|
uint16_t depth;
|
||
|
|
uint32_t root;
|
||
|
|
uint32_t leaf_count;
|
||
|
|
uint32_t leaf_head;
|
||
|
|
uint32_t leaf_tail;
|
||
|
|
uint16_t node_size;
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
struct hfsplus_catalog_key {
|
||
|
|
uint16_t key_len;
|
||
|
|
uint32_t parent_id;
|
||
|
|
uint16_t unicode_len;
|
||
|
|
uint8_t unicode[255 * 2];
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
struct hfsplus_extent {
|
||
|
|
uint32_t start_block;
|
||
|
|
uint32_t block_count;
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
#define HFSPLUS_EXTENT_COUNT 8
|
||
|
|
struct hfsplus_fork {
|
||
|
|
uint64_t total_size;
|
||
|
|
uint32_t clump_size;
|
||
|
|
uint32_t total_blocks;
|
||
|
|
struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
struct hfsplus_vol_header {
|
||
|
|
uint8_t signature[2];
|
||
|
|
uint16_t version;
|
||
|
|
uint32_t attributes;
|
||
|
|
uint32_t last_mount_vers;
|
||
|
|
uint32_t reserved;
|
||
|
|
uint32_t create_date;
|
||
|
|
uint32_t modify_date;
|
||
|
|
uint32_t backup_date;
|
||
|
|
uint32_t checked_date;
|
||
|
|
uint32_t file_count;
|
||
|
|
uint32_t folder_count;
|
||
|
|
uint32_t blocksize;
|
||
|
|
uint32_t total_blocks;
|
||
|
|
uint32_t free_blocks;
|
||
|
|
uint32_t next_alloc;
|
||
|
|
uint32_t rsrc_clump_sz;
|
||
|
|
uint32_t data_clump_sz;
|
||
|
|
uint32_t next_cnid;
|
||
|
|
uint32_t write_count;
|
||
|
|
uint64_t encodings_bmp;
|
||
|
|
struct hfs_finder_info finder_info;
|
||
|
|
struct hfsplus_fork alloc_file;
|
||
|
|
struct hfsplus_fork ext_file;
|
||
|
|
struct hfsplus_fork cat_file;
|
||
|
|
struct hfsplus_fork attr_file;
|
||
|
|
struct hfsplus_fork start_file;
|
||
|
|
} __attribute__((__packed__));
|
||
|
|
|
||
|
|
#define HFS_SUPERBLOCK_OFFSET 0x400
|
||
|
|
#define HFS_NODE_LEAF 0xff
|
||
|
|
#define HFSPLUS_POR_CNID 1
|
||
|
|
|
||
|
|
int volume_id_probe_hfs_hfsplus(struct volume_id *id, uint64_t off)
|
||
|
|
{
|
||
|
|
unsigned blocksize;
|
||
|
|
unsigned cat_block;
|
||
|
|
unsigned ext_block_start;
|
||
|
|
unsigned ext_block_count;
|
||
|
|
int ext;
|
||
|
|
unsigned leaf_node_head;
|
||
|
|
unsigned leaf_node_count;
|
||
|
|
unsigned leaf_node_size;
|
||
|
|
unsigned leaf_block;
|
||
|
|
uint64_t leaf_off;
|
||
|
|
unsigned alloc_block_size;
|
||
|
|
unsigned alloc_first_block;
|
||
|
|
unsigned embed_first_block;
|
||
|
|
unsigned record_count;
|
||
|
|
struct hfsplus_vol_header *hfsplus;
|
||
|
|
struct hfsplus_bnode_descriptor *descr;
|
||
|
|
struct hfsplus_bheader_record *bnode;
|
||
|
|
struct hfsplus_catalog_key *key;
|
||
|
|
unsigned label_len;
|
||
|
|
struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
|
||
|
|
struct hfs_mdb *hfs;
|
||
|
|
const uint8_t *buf;
|
||
|
|
|
||
|
|
dbg("probing at offset 0x%llx", (unsigned long long) off);
|
||
|
|
|
||
|
|
buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
|
||
|
|
if (buf == NULL)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
hfs = (struct hfs_mdb *) buf;
|
||
|
|
if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
|
||
|
|
goto checkplus;
|
||
|
|
|
||
|
|
/* it may be just a hfs wrapper for hfs+ */
|
||
|
|
if (memcmp(hfs->embed_sig, "H+", 2) == 0) {
|
||
|
|
alloc_block_size = be32_to_cpu(hfs->al_blk_size);
|
||
|
|
dbg("alloc_block_size 0x%x", alloc_block_size);
|
||
|
|
|
||
|
|
alloc_first_block = be16_to_cpu(hfs->al_bl_st);
|
||
|
|
dbg("alloc_first_block 0x%x", alloc_first_block);
|
||
|
|
|
||
|
|
embed_first_block = be16_to_cpu(hfs->embed_startblock);
|
||
|
|
dbg("embed_first_block 0x%x", embed_first_block);
|
||
|
|
|
||
|
|
off += (alloc_first_block * 512) +
|
||
|
|
(embed_first_block * alloc_block_size);
|
||
|
|
dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
|
||
|
|
|
||
|
|
buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
|
||
|
|
if (buf == NULL)
|
||
|
|
return -1;
|
||
|
|
goto checkplus;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hfs->label_len > 0 && hfs->label_len < 28) {
|
||
|
|
volume_id_set_label_raw(id, hfs->label, hfs->label_len);
|
||
|
|
volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
volume_id_set_uuid(id, hfs->finder_info.id, UUID_HFS);
|
||
|
|
|
||
|
|
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
|
||
|
|
id->type = "hfs";
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
checkplus:
|
||
|
|
hfsplus = (struct hfsplus_vol_header *) buf;
|
||
|
|
if (hfs->signature[0] == 'H')
|
||
|
|
if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
|
||
|
|
goto hfsplus;
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
hfsplus:
|
||
|
|
volume_id_set_uuid(id, hfsplus->finder_info.id, UUID_HFS);
|
||
|
|
|
||
|
|
blocksize = be32_to_cpu(hfsplus->blocksize);
|
||
|
|
dbg("blocksize %u", blocksize);
|
||
|
|
|
||
|
|
memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
|
||
|
|
cat_block = be32_to_cpu(extents[0].start_block);
|
||
|
|
dbg("catalog start block 0x%x", cat_block);
|
||
|
|
|
||
|
|
buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
|
||
|
|
if (buf == NULL)
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
bnode = (struct hfsplus_bheader_record *)
|
||
|
|
&buf[sizeof(struct hfsplus_bnode_descriptor)];
|
||
|
|
|
||
|
|
leaf_node_head = be32_to_cpu(bnode->leaf_head);
|
||
|
|
dbg("catalog leaf node 0x%x", leaf_node_head);
|
||
|
|
|
||
|
|
leaf_node_size = be16_to_cpu(bnode->node_size);
|
||
|
|
dbg("leaf node size 0x%x", leaf_node_size);
|
||
|
|
|
||
|
|
leaf_node_count = be32_to_cpu(bnode->leaf_count);
|
||
|
|
dbg("leaf node count 0x%x", leaf_node_count);
|
||
|
|
if (leaf_node_count == 0)
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
|
||
|
|
|
||
|
|
/* get physical location */
|
||
|
|
for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
|
||
|
|
ext_block_start = be32_to_cpu(extents[ext].start_block);
|
||
|
|
ext_block_count = be32_to_cpu(extents[ext].block_count);
|
||
|
|
dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
|
||
|
|
|
||
|
|
if (ext_block_count == 0)
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
/* this is our extent */
|
||
|
|
if (leaf_block < ext_block_count)
|
||
|
|
break;
|
||
|
|
|
||
|
|
leaf_block -= ext_block_count;
|
||
|
|
}
|
||
|
|
if (ext == HFSPLUS_EXTENT_COUNT)
|
||
|
|
goto found;
|
||
|
|
dbg("found block in extent %i", ext);
|
||
|
|
|
||
|
|
leaf_off = (ext_block_start + leaf_block) * blocksize;
|
||
|
|
|
||
|
|
buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
|
||
|
|
if (buf == NULL)
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
descr = (struct hfsplus_bnode_descriptor *) buf;
|
||
|
|
dbg("descriptor type 0x%x", descr->type);
|
||
|
|
|
||
|
|
record_count = be16_to_cpu(descr->num_recs);
|
||
|
|
dbg("number of records %u", record_count);
|
||
|
|
if (record_count == 0)
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
if (descr->type != HFS_NODE_LEAF)
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
key = (struct hfsplus_catalog_key *)
|
||
|
|
&buf[sizeof(struct hfsplus_bnode_descriptor)];
|
||
|
|
|
||
|
|
dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
|
||
|
|
if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
|
||
|
|
goto found;
|
||
|
|
|
||
|
|
label_len = be16_to_cpu(key->unicode_len) * 2;
|
||
|
|
dbg("label unicode16 len %i", label_len);
|
||
|
|
volume_id_set_label_raw(id, key->unicode, label_len);
|
||
|
|
volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
|
||
|
|
|
||
|
|
found:
|
||
|
|
volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
|
||
|
|
id->type = "hfsplus";
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|