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-rw-r--r--extras/volume_id/lib/hpfs.c67
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;
}