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diff --git a/knowndrives.h b/knowndrives.h
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+/*
+ * knowndrives.h
+ *
+ * Home page of code is: https://www.smartmontools.org
+ *
+ * Copyright (C) 2003-11 Philip Williams, Bruce Allen
+ * Copyright (C) 2008-21 Christian Franke
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef KNOWNDRIVES_H_
+#define KNOWNDRIVES_H_
+
+#define KNOWNDRIVES_H_CVSID "$Id: knowndrives.h 5207 2021-02-09 20:25:13Z chrfranke $\n"
+
+// Structure to store drive database entries, see drivedb.h for a description.
+struct drive_settings {
+  const char * modelfamily;
+  const char * modelregexp;
+  const char * firmwareregexp;
+  const char * warningmsg;
+  const char * presets;
+};
+
+// info returned by lookup_usb_device()
+struct usb_dev_info
+{
+  std::string usb_device; // Device name, empty if unknown
+  std::string usb_bridge; // USB bridge name, empty if unknown
+  std::string usb_type;   // Type string ('-d' option).
+};
+
+// Search drivedb for USB device with vendor:product ID.
+int lookup_usb_device(int vendor_id, int product_id, int bcd_device,
+                      usb_dev_info & info, usb_dev_info & info2);
+
+// Shows the presets (if any) that are available for the given drive.
+void show_presets(const ata_identify_device * drive);
+
+// Shows all presets for drives in knowndrives[].
+// Returns #syntax errors.
+int showallpresets();
+
+// Shows all matching presets for a drive in knowndrives[].
+// Returns # matching entries.
+int showmatchingpresets(const char *model, const char *firmware);
+
+// Searches drive database and sets preset vendor attribute
+// options in defs and firmwarebugs.
+// Values that have already been set will not be changed.
+// Returns pointer to database entry or nullptr if none found.
+const drive_settings * lookup_drive_apply_presets(
+  const ata_identify_device * drive, ata_vendor_attr_defs & defs,
+  firmwarebug_defs & firmwarebugs, std::string & dbversion);
+
+// Get path for additional database file
+const char * get_drivedb_path_add();
+
+#ifdef SMARTMONTOOLS_DRIVEDBDIR
+// Get path for default database file
+const char * get_drivedb_path_default();
+#endif
+
+// Read drive database from file.
+bool read_drive_database(const char * path);
+
+// Init default db entry and optionally read drive databases from standard places.
+bool init_drive_database(bool use_default_db);
+
+// Get vendor attribute options from default db entry.
+const ata_vendor_attr_defs & get_default_attr_defs();
+
+#endif