+static char *
+gen_uuid_from_volset (char *volset_ident)
+{
+ grub_size_t i;
+ grub_size_t len;
+ grub_size_t nonhexpos;
+ grub_uint8_t buf[17];
+ char *uuid;
+
+ len = grub_strlen (volset_ident);
+ if (len < 8)
+ return NULL;
+
+ uuid = grub_malloc (17);
+ if (!uuid)
+ return NULL;
+
+ if (len > 16)
+ len = 16;
+
+ grub_memset (buf, 0, sizeof (buf));
+ grub_memcpy (buf, volset_ident, len);
+
+ nonhexpos = 16;
+ for (i = 0; i < 16; ++i)
+ {
+ if (!grub_isxdigit (buf[i]))
+ {
+ nonhexpos = i;
+ break;
+ }
+ }
+
+ if (nonhexpos < 8)
+ {
+ grub_snprintf (uuid, 17, "%02x%02x%02x%02x%02x%02x%02x%02x",
+ buf[0], buf[1], buf[2], buf[3],
+ buf[4], buf[5], buf[6], buf[7]);
+ }
+ else if (nonhexpos < 16)
+ {
+ for (i = 0; i < 8; ++i)
+ uuid[i] = grub_tolower (buf[i]);
+ grub_snprintf (uuid+8, 9, "%02x%02x%02x%02x",
+ buf[8], buf[9], buf[10], buf[11]);
+ }
+ else
+ {
+ for (i = 0; i < 16; ++i)
+ uuid[i] = grub_tolower (buf[i]);
+ uuid[16] = 0;
+ }
+
+ return uuid;
+}
+
+static grub_err_t
+grub_udf_uuid (grub_device_t device, char **uuid)
+{
+ char *volset_ident;
+ struct grub_udf_data *data;
+ data = grub_udf_mount (device->disk);
+
+ if (data)
+ {
+ volset_ident = read_dstring (data->pvd.volset_ident, sizeof (data->pvd.volset_ident));
+ if (volset_ident)
+ {
+ *uuid = gen_uuid_from_volset (volset_ident);
+ grub_free (volset_ident);
+ }
+ else
+ *uuid = 0;
+ grub_free (data);
+ }
+ else
+ *uuid = 0;
+
+ return grub_errno;
+}
+