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Diffstat (limited to '')
| -rw-r--r-- | libblkid/hfs.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/libblkid/hfs.c b/libblkid/hfs.c new file mode 100644 index 000000000..6d960e9e7 --- /dev/null +++ b/libblkid/hfs.c @@ -0,0 +1,321 @@ +/* + * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org> + * Copyright (C) 2008 Karel Zak <kzak@redhat.com> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <inttypes.h> + +#include "superblocks.h" +#include "md5.h" + +/* HFS / HFS+ */ +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)); + + +#define HFS_NODE_LEAF 0xff +#define HFSPLUS_POR_CNID 1 + +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 HFSPLUS_SECTOR_SIZE 512 + +static int hfs_set_uuid(blkid_probe pr, unsigned char const *hfs_info, size_t len) +{ + static unsigned char const hash_init[MD5LENGTH] = { + 0xb3, 0xe2, 0x0f, 0x39, 0xf2, 0x92, 0x11, 0xd6, + 0x97, 0xa4, 0x00, 0x30, 0x65, 0x43, 0xec, 0xac + }; + unsigned char uuid[MD5LENGTH]; + struct MD5Context md5c; + + if (memcmp(hfs_info, "\0\0\0\0\0\0\0\0", len) == 0) + return -1; + MD5Init(&md5c); + MD5Update(&md5c, hash_init, MD5LENGTH); + MD5Update(&md5c, hfs_info, len); + MD5Final(uuid, &md5c); + uuid[6] = 0x30 | (uuid[6] & 0x0f); + uuid[8] = 0x80 | (uuid[8] & 0x3f); + return blkid_probe_set_uuid(pr, uuid); +} + +static int probe_hfs(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct hfs_mdb *hfs; + + hfs = blkid_probe_get_sb(pr, mag, struct hfs_mdb); + if (!hfs) + return -1; + + if ((memcmp(hfs->embed_sig, "H+", 2) == 0) || + (memcmp(hfs->embed_sig, "HX", 2) == 0)) + return 1; /* Not hfs, but an embedded HFS+ */ + + hfs_set_uuid(pr, hfs->finder_info.id, sizeof(hfs->finder_info.id)); + + blkid_probe_set_label(pr, hfs->label, hfs->label_len); + return 0; +} + +static int probe_hfsplus(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; + struct hfsplus_bnode_descriptor *descr; + struct hfsplus_bheader_record *bnode; + struct hfsplus_catalog_key *key; + struct hfsplus_vol_header *hfsplus; + struct hfs_mdb *sbd; + unsigned int alloc_block_size; + unsigned int alloc_first_block; + unsigned int embed_first_block; + unsigned int off = 0; + unsigned int blocksize; + unsigned int cat_block; + unsigned int ext_block_start; + unsigned int ext_block_count; + unsigned int record_count; + unsigned int leaf_node_head; + unsigned int leaf_node_count; + unsigned int leaf_node_size; + unsigned int leaf_block; + int ext; + uint64_t leaf_off; + unsigned char *buf; + + sbd = blkid_probe_get_sb(pr, mag, struct hfs_mdb); + if (!sbd) + return -1; + + /* Check for a HFS+ volume embedded in a HFS volume */ + if (memcmp(sbd->signature, "BD", 2) == 0) { + if ((memcmp(sbd->embed_sig, "H+", 2) != 0) && + (memcmp(sbd->embed_sig, "HX", 2) != 0)) + /* This must be an HFS volume, so fail */ + return 1; + + alloc_block_size = be32_to_cpu(sbd->al_blk_size); + alloc_first_block = be16_to_cpu(sbd->al_bl_st); + embed_first_block = be16_to_cpu(sbd->embed_startblock); + off = (alloc_first_block * 512) + + (embed_first_block * alloc_block_size); + + buf = blkid_probe_get_buffer(pr, + off + (mag->kboff * 1024), + sizeof(struct hfsplus_vol_header)); + hfsplus = (struct hfsplus_vol_header *) buf; + + } else + hfsplus = blkid_probe_get_sb(pr, mag, + struct hfsplus_vol_header); + + if (!hfsplus) + return -1; + + if ((memcmp(hfsplus->signature, "H+", 2) != 0) && + (memcmp(hfsplus->signature, "HX", 2) != 0)) + return 1; + + hfs_set_uuid(pr, hfsplus->finder_info.id, sizeof(hfsplus->finder_info.id)); + + blocksize = be32_to_cpu(hfsplus->blocksize); + if (blocksize < HFSPLUS_SECTOR_SIZE) + return -1; + + memcpy(extents, hfsplus->cat_file.extents, sizeof(extents)); + cat_block = be32_to_cpu(extents[0].start_block); + + buf = blkid_probe_get_buffer(pr, + off + ((blkid_loff_t) cat_block * blocksize), 0x2000); + if (!buf) + return 0; + + bnode = (struct hfsplus_bheader_record *) + &buf[sizeof(struct hfsplus_bnode_descriptor)]; + + leaf_node_head = be32_to_cpu(bnode->leaf_head); + leaf_node_size = be16_to_cpu(bnode->node_size); + leaf_node_count = be32_to_cpu(bnode->leaf_count); + if (leaf_node_count == 0) + return 0; + + 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); + if (ext_block_count == 0) + return 0; + + /* this is our extent */ + if (leaf_block < ext_block_count) + break; + + leaf_block -= ext_block_count; + } + if (ext == HFSPLUS_EXTENT_COUNT) + return 0; + + leaf_off = (ext_block_start + leaf_block) * blocksize; + + buf = blkid_probe_get_buffer(pr, + (blkid_loff_t) off + leaf_off, + leaf_node_size); + if (!buf) + return 0; + + descr = (struct hfsplus_bnode_descriptor *) buf; + record_count = be16_to_cpu(descr->num_recs); + if (record_count == 0) + return 0; + + if (descr->type != HFS_NODE_LEAF) + return 0; + + key = (struct hfsplus_catalog_key *) + &buf[sizeof(struct hfsplus_bnode_descriptor)]; + + if (be32_to_cpu(key->parent_id) != HFSPLUS_POR_CNID) + return 0; + + blkid_probe_set_utf8label(pr, key->unicode, + be16_to_cpu(key->unicode_len) * 2, + BLKID_ENC_UTF16BE); + return 0; +} + +const struct blkid_idinfo hfs_idinfo = +{ + .name = "hfs", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_hfs, + .flags = BLKID_IDINFO_TOLERANT, + .magics = + { + { .magic = "BD", .len = 2, .kboff = 1 }, + { NULL } + } +}; + +const struct blkid_idinfo hfsplus_idinfo = +{ + .name = "hfsplus", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_hfsplus, + .magics = + { + { .magic = "BD", .len = 2, .kboff = 1 }, + { .magic = "H+", .len = 2, .kboff = 1 }, + { .magic = "HX", .len = 2, .kboff = 1 }, + { NULL } + } +}; |