(* Copyright (C) 2005, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

(* $Id$ *)

open Printf

exception Checksum_failure of string
exception Corrupt_metadata of string
exception Version_mismatch of string

let magic = 1
let format_name = "metadata"

type metadata =
  | Dependency of string  (* baseuri without trailing slash *)

let eq_metadata (m1:metadata) (m2:metadata) = m1 = m2

let save_metadata_to_file ~fname metadata =
  HMarshal.save ~fmt:format_name ~version:magic ~fname metadata

let load_metadata_from_file ~fname =
  let raw = HMarshal.load ~fmt:format_name ~version:magic ~fname in
  (raw: metadata list)

let save_metadata ~fname metadata = save_metadata_to_file ~fname metadata
let load_metadata ~fname = load_metadata_from_file ~fname