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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-02-18 21:08:49 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-02-18 21:08:49 +0000
commitde7684a309ad20c1b889d048d741cb1dd52245f7 (patch)
treeefae3387e1978cdd128ff2a922b734d0e9d0180f /util-linux/volume_id/hfs.c
parent27dd495b98a6135554b1d839fefe436ba3c6ca71 (diff)
downloadbusybox-de7684a309ad20c1b889d048d741cb1dd52245f7.tar.gz
busybox-de7684a309ad20c1b889d048d741cb1dd52245f7.tar.bz2
support for mount by label (not yet tested)
Also adds findfs applet. Closes bug 1143.
Diffstat (limited to 'util-linux/volume_id/hfs.c')
-rw-r--r--util-linux/volume_id/hfs.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/util-linux/volume_id/hfs.c b/util-linux/volume_id/hfs.c
new file mode 100644
index 000000000..71a3df0b8
--- /dev/null
+++ b/util-linux/volume_id/hfs.c
@@ -0,0 +1,292 @@
+/*
+ * 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;
+}