volume_id: hpfs - read label and uuid

[elogind.git] / extras / volume_id / lib / hpfs.c

diff --git a/extras/volume_id/lib/hpfs.c b/extras/volume_id/lib/hpfs.c
index a59ca1d99b23da379e4f2ded034b392ade5c9ae4..80ba289773619fbe860a4e96393e3c16d62ce543 100644 (file)
--- 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;
 }