1 (* Copyright (C) 2005, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
26 exception Checksum_failure of string
27 exception Corrupt_moo of string
28 exception Version_mismatch of string
30 type ast_command = (CicNotationPt.term, CicNotationPt.obj) GrafiteAst.command
31 type moo = ast_command list * GrafiteAst.metadata list (** <moo, metadata> *)
33 let marshal_flags = []
36 * - an integer -- magic number -- denoting the version of the dumped data
37 * structure. Different magic numbers stand for incompatible data structures
38 * - an integer -- checksum -- denoting the hash value (computed with
39 * Hashtbl.hash) of the string representation of the dumped data structur
40 * - marshalled pair: first component is a list of GrafiteAst.command (real moo
41 * content), second component is a list of GrafiteAst.metadata
44 let save_moo ~fname (moo, metadata) =
45 let oc = open_out fname in
47 Marshal.to_string (List.rev moo, List.rev metadata) marshal_flags
49 let checksum = Hashtbl.hash marshalled in
50 output_binary_int oc GrafiteAst.magic;
51 output_binary_int oc checksum;
52 output_string oc marshalled;
56 let ic = open_in fname in
58 (fun () -> close_in ic)
61 let moo_magic = input_binary_int ic in
62 if moo_magic <> GrafiteAst.magic then raise (Version_mismatch fname);
63 let moo_checksum = input_binary_int ic in
64 let marshalled = HExtlib.input_all ic in
65 let checksum = Hashtbl.hash marshalled in
66 if checksum <> moo_checksum then raise (Checksum_failure fname);
68 Marshal.from_string marshalled 0
71 with End_of_file -> raise (Corrupt_moo fname))