generator: Add OCaml bindings.

[hivex.git] / ocaml / t / hivex_300_fold.ml

diff --git a/ocaml/t/hivex_300_fold.ml b/ocaml/t/hivex_300_fold.ml
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+(* hivex OCaml bindings
+ * Copyright (C) 2009-2010 Red Hat Inc.
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *)
+
+(* Fold over the large hive. *)
+
+open Unix
+open Printf
+let (//) = Filename.concat
+let srcdir = try Sys.getenv "srcdir" with Not_found -> "."
+
+(* This is a generic function to fold over hives.
+ *   fn : 'a -> node -> 'a is called for each node
+ *   fv : 'a -> node -> value array -> 'a is called for the values at each node
+ *)
+let hive_fold h fn fv a root =
+  let rec fold a node =
+    let a = fn a node in
+    let a = fv a node (Hivex.node_values h node) in
+    Array.fold_left fold a (Hivex.node_children h node)
+  in
+  fold a root
+
+let () =
+  let h = Hivex.open_file (srcdir // "../images/large") [] in
+
+  (* Count the number of nodes and values in the hive. *)
+  let count_node (nodes, values) _ = (nodes+1, values) in
+  let count_values (nodes, values) _ vs = (nodes, values + Array.length vs) in
+  let root = Hivex.root h in
+  let (nodes, values) = hive_fold h count_node count_values (0, 0) root in
+  printf "large test hive contains %d nodes and %d values\n%!" nodes values;
+
+  Hivex.close h;
+
+  (* Gc.compact is a good way to ensure we don't have
+   * heap corruption or double-freeing.
+   *)
+  Gc.compact ()