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busybox/util-linux/volume_id/hfs.c
Denys Vlasenko f560422fa0 Big cleanup in config help and description 
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00

321 lines
8.3 KiB
C
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/*
* 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
*/
//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_HFS) += hfs.o
//config:config FEATURE_VOLUMEID_HFS
//config: bool "hfs filesystem"
//config: default y
//config: depends on VOLUMEID
#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];
} 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;
} PACKED;
struct hfsplus_bnode_descriptor {
uint32_t next;
uint32_t prev;
uint8_t type;
uint8_t height;
uint16_t num_recs;
uint16_t reserved;
} 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;
} PACKED;
struct hfsplus_catalog_key {
uint16_t key_len;
uint32_t parent_id;
uint16_t unicode_len;
uint8_t unicode[255 * 2];
} PACKED;
struct hfsplus_extent {
uint32_t start_block;
uint32_t block_count;
} 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];
} 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;
} PACKED;
#define HFS_SUPERBLOCK_OFFSET 0x400
#define HFS_NODE_LEAF 0xff
#define HFSPLUS_POR_CNID 1
static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
{
#define hfs_id_len 8
md5_ctx_t md5c;
uint8_t uuid[16];
unsigned i;
for (i = 0; i < hfs_id_len; i++)
if (hfs_id[i] != 0)
goto do_md5;
return;
do_md5:
md5_begin(&md5c);
md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
md5_hash(&md5c, hfs_id, hfs_id_len);
md5_end(&md5c, uuid);
uuid[6] = 0x30 | (uuid[6] & 0x0f);
uuid[8] = 0x80 | (uuid[8] & 0x3f);
volume_id_set_uuid(id, uuid, UUID_DCE);
}
int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
{
uint64_t off = 0;
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 (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
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) ;
}
hfs_set_uuid(id, hfs->finder_info.id);
// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
IF_FEATURE_BLKID_TYPE(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:
hfs_set_uuid(id, hfsplus->finder_info.id);
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);
IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
return 0;
}
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