diff options
Diffstat (limited to 'extras')
| -rw-r--r-- | extras/volume_id/lib/hpfs.c | 67 |
1 files changed, 60 insertions, 7 deletions
diff --git a/extras/volume_id/lib/hpfs.c b/extras/volume_id/lib/hpfs.c index a59ca1d99b..80ba289773 100644 --- a/extras/volume_id/lib/hpfs.c +++ b/extras/volume_id/lib/hpfs.c @@ -31,31 +31,84 @@ #include "libvolume_id.h" #include "libvolume_id-private.h" +struct hpfs_boot_block +{ + uint8_t jmp[3]; + uint8_t oem_id[8]; + uint8_t bytes_per_sector[2]; + uint8_t sectors_per_cluster; + uint8_t n_reserved_sectors[2]; + uint8_t n_fats; + uint8_t n_rootdir_entries[2]; + uint8_t n_sectors_s[2]; + uint8_t media_byte; + uint16_t sectors_per_fat; + uint16_t sectors_per_track; + uint16_t heads_per_cyl; + uint32_t n_hidden_sectors; + uint32_t n_sectors_l; + uint8_t drive_number; + uint8_t mbz; + uint8_t sig_28h; + uint8_t vol_serno[4]; + uint8_t vol_label[11]; + uint8_t sig_hpfs[8]; + uint8_t pad[448]; + uint8_t magic[2]; +} PACKED; + struct hpfs_super { uint8_t magic[4]; + uint8_t magic1[4]; uint8_t version; } PACKED; + +struct hpfs_spare_super +{ + uint8_t magic[4]; + uint8_t magic1[4]; +} PACKED; + #define HPFS_SUPERBLOCK_OFFSET 0x2000 +#define HPFS_SUPERBLOCK_SPARE_OFFSET 0x2200 int volume_id_probe_hpfs(struct volume_id *id, uint64_t off, uint64_t size) { struct hpfs_super *hs; + struct hpfs_spare_super *hss; + struct hpfs_boot_block *hbb; info("probing at offset 0x%llx\n", (unsigned long long) off); - hs = (struct hpfs_super *) volume_id_get_buffer(id, off + HPFS_SUPERBLOCK_OFFSET, 0x200); + hs = (struct hpfs_super *) volume_id_get_buffer(id, off + HPFS_SUPERBLOCK_OFFSET, 0x400); if (hs == NULL) return -1; + if (memcmp(hs->magic, "\x49\xe8\x95\xf9", 4) != 0) + return -1; - if (memcmp(hs->magic, "\x49\xe8\x95\xf9", 4) == 0) { - sprintf(id->type_version, "%u", hs->version); + hss = (struct hpfs_spare_super *) volume_id_get_buffer(id, off + HPFS_SUPERBLOCK_SPARE_OFFSET, 0x200); + if (hss == NULL) + return -1; + if (memcmp(hss->magic, "\x49\x18\x91\xf9", 4) != 0) + return -1; - volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); - id->type = "hpfs"; - return 0; + sprintf(id->type_version, "%u", hs->version); + volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); + id->type = "hpfs"; + + /* if boot block looks valid, read label and uuid from there */ + hbb = (struct hpfs_boot_block *) volume_id_get_buffer(id, off, 0x200); + if (hs == NULL) + return -1; + if (memcmp(hbb->magic, "\x55\xaa", 2) == 0 && + memcmp(hbb->sig_hpfs, "HPFS", 4) == 0 && + hbb->sig_28h == 0x28) { + volume_id_set_label_raw(id, hbb->vol_label, 11); + volume_id_set_label_string(id, hbb->vol_label, 11); + volume_id_set_uuid(id, hbb->vol_serno, 0, UUID_DOS); } - return -1; + return 0; } |