* http://helm.cs.unibo.it/
*)
+(* $Id$ *)
+
open Printf
exception Checksum_failure of string
exception Version_mismatch of string
let magic = 1
+let format_name = "metadata"
type metadata =
| Dependency of string (* baseuri without trailing slash *)
- | Baseuri of string
let eq_metadata (m1:metadata) (m2:metadata) = m1 = m2
-let marshal_flags = []
-
-(** .metadata file format
- * - an integer -- magic number -- denoting the version of the dumped data
- * structure. Different magic numbers stand for incompatible data structures
- * - an integer -- checksum -- denoting the hash value (computed with
- * Hashtbl.hash) of the string representation of the dumped data structur
- * - marshalled data: list of metadata
- *)
+let save_metadata_to_file ~fname metadata =
+ HMarshal.save ~fmt:format_name ~version:magic ~fname metadata
-let save_metadata ~fname metadata =
- let oc = open_out fname in
- let marshalled = Marshal.to_string metadata marshal_flags in
- let checksum = Hashtbl.hash marshalled in
- output_binary_int oc magic;
- output_binary_int oc checksum;
- output_string oc marshalled;
- close_out oc
+let load_metadata_from_file ~fname =
+ let raw = HMarshal.load ~fmt:format_name ~version:magic ~fname in
+ (raw: metadata list)
-let load_metadata ~fname =
- let ic = open_in fname in
- HExtlib.finally
- (fun () -> close_in ic)
- (fun () ->
- try
- let file_magic = input_binary_int ic in
- if file_magic <> magic then raise (Version_mismatch fname);
- let file_checksum = input_binary_int ic in
- let marshalled = HExtlib.input_all ic in
- let checksum = Hashtbl.hash marshalled in
- if checksum <> file_checksum then raise (Checksum_failure fname);
- let (metadata:metadata list) = Marshal.from_string marshalled 0 in
- metadata
- with End_of_file -> raise (Corrupt_metadata fname))
- ()
+let save_metadata ~fname metadata = save_metadata_to_file ~fname metadata
+let load_metadata ~fname = load_metadata_from_file ~fname