diff options
Diffstat (limited to 'extras/volume_id/lib/hfs.c')
| -rw-r--r-- | extras/volume_id/lib/hfs.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/extras/volume_id/lib/hfs.c b/extras/volume_id/lib/hfs.c new file mode 100644 index 0000000000..a6e378dd28 --- /dev/null +++ b/extras/volume_id/lib/hfs.c @@ -0,0 +1,297 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 of the License. + */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE 1 +#endif + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> + +#include "libvolume_id.h" +#include "util.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 *hfs; + +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 *hfsplus; + +#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 int blocksize; + unsigned int cat_block; + unsigned int ext_block_start; + unsigned int ext_block_count; + int ext; + unsigned int leaf_node_head; + unsigned int leaf_node_count; + unsigned int leaf_node_size; + unsigned int leaf_block; + uint64_t leaf_off; + unsigned int alloc_block_size; + unsigned int alloc_first_block; + unsigned int embed_first_block; + unsigned int record_count; + struct hfsplus_bnode_descriptor *descr; + struct hfsplus_bheader_record *bnode; + struct hfsplus_catalog_key *key; + unsigned int label_len; + struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; + 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 (memcmp(hfs->signature, "BD", 2) != 0) + 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 (memcmp(hfsplus->signature, "H+", 2) == 0) + goto hfsplus; + if (memcmp(hfsplus->signature, "HX", 2) == 0) + 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 (be32_to_cpu(key->parent_id) != 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; +} |