320 lines
8.3 KiB
C
320 lines
8.3 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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//config:config FEATURE_VOLUMEID_HFS
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//config: bool "hfs filesystem"
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//config: default y
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//config: depends on VOLUMEID
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//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_HFS) += hfs.o
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#include "volume_id_internal.h"
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struct hfs_finder_info{
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uint32_t boot_folder;
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uint32_t start_app;
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uint32_t open_folder;
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uint32_t os9_folder;
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uint32_t reserved;
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uint32_t osx_folder;
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uint8_t id[8];
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} PACKED;
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struct hfs_mdb {
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uint8_t signature[2];
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uint32_t cr_date;
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uint32_t ls_Mod;
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uint16_t atrb;
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uint16_t nm_fls;
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uint16_t vbm_st;
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uint16_t alloc_ptr;
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uint16_t nm_al_blks;
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uint32_t al_blk_size;
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uint32_t clp_size;
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uint16_t al_bl_st;
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uint32_t nxt_cnid;
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uint16_t free_bks;
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uint8_t label_len;
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uint8_t label[27];
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uint32_t vol_bkup;
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uint16_t vol_seq_num;
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uint32_t wr_cnt;
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uint32_t xt_clump_size;
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uint32_t ct_clump_size;
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uint16_t num_root_dirs;
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uint32_t file_count;
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uint32_t dir_count;
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struct hfs_finder_info finder_info;
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uint8_t embed_sig[2];
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uint16_t embed_startblock;
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uint16_t embed_blockcount;
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} PACKED;
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struct hfsplus_bnode_descriptor {
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uint32_t next;
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uint32_t prev;
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uint8_t type;
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uint8_t height;
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uint16_t num_recs;
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uint16_t reserved;
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} PACKED;
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struct hfsplus_bheader_record {
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uint16_t depth;
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uint32_t root;
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uint32_t leaf_count;
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uint32_t leaf_head;
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uint32_t leaf_tail;
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uint16_t node_size;
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} PACKED;
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struct hfsplus_catalog_key {
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uint16_t key_len;
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uint32_t parent_id;
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uint16_t unicode_len;
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uint8_t unicode[255 * 2];
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} PACKED;
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struct hfsplus_extent {
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uint32_t start_block;
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uint32_t block_count;
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} PACKED;
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#define HFSPLUS_EXTENT_COUNT 8
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struct hfsplus_fork {
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uint64_t total_size;
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uint32_t clump_size;
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uint32_t total_blocks;
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struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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} PACKED;
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struct hfsplus_vol_header {
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uint8_t signature[2];
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uint16_t version;
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uint32_t attributes;
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uint32_t last_mount_vers;
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uint32_t reserved;
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uint32_t create_date;
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uint32_t modify_date;
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uint32_t backup_date;
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uint32_t checked_date;
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uint32_t file_count;
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uint32_t folder_count;
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uint32_t blocksize;
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uint32_t total_blocks;
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uint32_t free_blocks;
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uint32_t next_alloc;
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uint32_t rsrc_clump_sz;
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uint32_t data_clump_sz;
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uint32_t next_cnid;
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uint32_t write_count;
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uint64_t encodings_bmp;
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struct hfs_finder_info finder_info;
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struct hfsplus_fork alloc_file;
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struct hfsplus_fork ext_file;
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struct hfsplus_fork cat_file;
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struct hfsplus_fork attr_file;
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struct hfsplus_fork start_file;
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} PACKED;
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#define HFS_SUPERBLOCK_OFFSET 0x400
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#define HFS_NODE_LEAF 0xff
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#define HFSPLUS_POR_CNID 1
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static void FAST_FUNC hfs_set_uuid(struct volume_id *id, const uint8_t *hfs_id)
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{
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#define hfs_id_len 8
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md5_ctx_t md5c;
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uint8_t uuid[16];
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unsigned i;
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for (i = 0; i < hfs_id_len; i++)
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if (hfs_id[i] != 0)
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goto do_md5;
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return;
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do_md5:
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md5_begin(&md5c);
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md5_hash(&md5c, "\263\342\17\71\362\222\21\326\227\244\0\60\145\103\354\254", 16);
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md5_hash(&md5c, hfs_id, hfs_id_len);
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md5_end(&md5c, uuid);
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uuid[6] = 0x30 | (uuid[6] & 0x0f);
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uuid[8] = 0x80 | (uuid[8] & 0x3f);
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volume_id_set_uuid(id, uuid, UUID_DCE);
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}
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int FAST_FUNC volume_id_probe_hfs_hfsplus(struct volume_id *id /*,uint64_t off*/)
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{
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uint64_t off = 0;
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unsigned blocksize;
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unsigned cat_block;
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unsigned ext_block_start;
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unsigned ext_block_count;
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int ext;
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unsigned leaf_node_head;
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unsigned leaf_node_count;
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unsigned leaf_node_size;
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unsigned leaf_block;
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uint64_t leaf_off;
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unsigned alloc_block_size;
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unsigned alloc_first_block;
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unsigned embed_first_block;
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unsigned record_count;
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struct hfsplus_vol_header *hfsplus;
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struct hfsplus_bnode_descriptor *descr;
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struct hfsplus_bheader_record *bnode;
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struct hfsplus_catalog_key *key;
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unsigned label_len;
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struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT];
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struct hfs_mdb *hfs;
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const uint8_t *buf;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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if (buf == NULL)
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return -1;
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hfs = (struct hfs_mdb *) buf;
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if (hfs->signature[0] != 'B' || hfs->signature[1] != 'D')
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goto checkplus;
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/* it may be just a hfs wrapper for hfs+ */
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if (hfs->embed_sig[0] == 'H' && hfs->embed_sig[1] == '+') {
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alloc_block_size = be32_to_cpu(hfs->al_blk_size);
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dbg("alloc_block_size 0x%x", alloc_block_size);
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alloc_first_block = be16_to_cpu(hfs->al_bl_st);
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dbg("alloc_first_block 0x%x", alloc_first_block);
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embed_first_block = be16_to_cpu(hfs->embed_startblock);
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dbg("embed_first_block 0x%x", embed_first_block);
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off += (alloc_first_block * 512) +
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(embed_first_block * alloc_block_size);
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dbg("hfs wrapped hfs+ found at offset 0x%llx", (unsigned long long) off);
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buf = volume_id_get_buffer(id, off + HFS_SUPERBLOCK_OFFSET, 0x200);
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if (buf == NULL)
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return -1;
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goto checkplus;
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}
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if (hfs->label_len > 0 && hfs->label_len < 28) {
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// volume_id_set_label_raw(id, hfs->label, hfs->label_len);
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volume_id_set_label_string(id, hfs->label, hfs->label_len) ;
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}
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hfs_set_uuid(id, hfs->finder_info.id);
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// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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IF_FEATURE_BLKID_TYPE(id->type = "hfs";)
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return 0;
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checkplus:
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hfsplus = (struct hfsplus_vol_header *) buf;
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if (hfs->signature[0] == 'H')
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if (hfs->signature[1] == '+' || hfs->signature[1] == 'X')
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goto hfsplus;
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return -1;
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hfsplus:
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hfs_set_uuid(id, hfsplus->finder_info.id);
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blocksize = be32_to_cpu(hfsplus->blocksize);
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dbg("blocksize %u", blocksize);
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memcpy(extents, hfsplus->cat_file.extents, sizeof(extents));
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cat_block = be32_to_cpu(extents[0].start_block);
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dbg("catalog start block 0x%x", cat_block);
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buf = volume_id_get_buffer(id, off + (cat_block * blocksize), 0x2000);
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if (buf == NULL)
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goto found;
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bnode = (struct hfsplus_bheader_record *)
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&buf[sizeof(struct hfsplus_bnode_descriptor)];
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leaf_node_head = be32_to_cpu(bnode->leaf_head);
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dbg("catalog leaf node 0x%x", leaf_node_head);
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leaf_node_size = be16_to_cpu(bnode->node_size);
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dbg("leaf node size 0x%x", leaf_node_size);
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leaf_node_count = be32_to_cpu(bnode->leaf_count);
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dbg("leaf node count 0x%x", leaf_node_count);
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if (leaf_node_count == 0)
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goto found;
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leaf_block = (leaf_node_head * leaf_node_size) / blocksize;
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/* get physical location */
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for (ext = 0; ext < HFSPLUS_EXTENT_COUNT; ext++) {
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ext_block_start = be32_to_cpu(extents[ext].start_block);
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ext_block_count = be32_to_cpu(extents[ext].block_count);
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dbg("extent start block 0x%x, count 0x%x", ext_block_start, ext_block_count);
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if (ext_block_count == 0)
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goto found;
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/* this is our extent */
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if (leaf_block < ext_block_count)
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break;
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leaf_block -= ext_block_count;
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}
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if (ext == HFSPLUS_EXTENT_COUNT)
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goto found;
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dbg("found block in extent %i", ext);
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leaf_off = (ext_block_start + leaf_block) * blocksize;
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buf = volume_id_get_buffer(id, off + leaf_off, leaf_node_size);
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if (buf == NULL)
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goto found;
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descr = (struct hfsplus_bnode_descriptor *) buf;
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dbg("descriptor type 0x%x", descr->type);
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record_count = be16_to_cpu(descr->num_recs);
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dbg("number of records %u", record_count);
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if (record_count == 0)
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goto found;
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if (descr->type != HFS_NODE_LEAF)
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goto found;
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key = (struct hfsplus_catalog_key *)
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&buf[sizeof(struct hfsplus_bnode_descriptor)];
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dbg("parent id 0x%x", be32_to_cpu(key->parent_id));
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if (key->parent_id != cpu_to_be32(HFSPLUS_POR_CNID))
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goto found;
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label_len = be16_to_cpu(key->unicode_len) * 2;
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dbg("label unicode16 len %i", label_len);
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// volume_id_set_label_raw(id, key->unicode, label_len);
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volume_id_set_label_unicode16(id, key->unicode, BE, label_len);
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found:
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// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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IF_FEATURE_BLKID_TYPE(id->type = "hfsplus";)
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return 0;
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}
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