DtMmdb: move to lib directory as a standalone library.

cde/lib/DtMmdb/utility/randomize.C

@@ -0,0 +1,57 @@
+/*
+ * CDE - Common Desktop Environment
+ *
+ * Copyright (c) 1993-2012, The Open Group. All rights reserved.
+ *
+ * These libraries and programs are free software; you can
+ * redistribute them and/or modify them under the terms of the GNU
+ * Lesser General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * These libraries and programs are distributed in the hope that
+ * they will be useful, but WITHOUT ANY WARRANTY; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU Lesser General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with these libraries and programs; if not, write
+ * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
+ * Floor, Boston, MA 02110-1301 USA
+ */
+// $XConsortium: randomize.cc /main/3 1996/06/11 17:38:40 cde-hal $
+
+#include "utility/randomize.h"
+
+randomize::randomize(int sd) : rdn(sd)
+{
+}
+
+void randomize::scramble(buffer& original)
+{
+   int bytes = original.content_sz();
+   char* buf = original.get_base();
+
+   for ( int i=0; i<bytes-1; i++ ) 
+      char_swap(buf[i], buf[rdn.rand() % ( bytes - i ) + i]);
+}   
+
+void randomize::restore(buffer& scrambled)
+{
+   int bytes = scrambled.content_sz();
+   char* buf = scrambled.get_base();
+
+   int *pos = new int[bytes-1];
+
+   int i;
+   for ( i=0; i<bytes-1; i++ ) {
+      pos[i] = rdn.rand() % ( bytes - i ) + i;
+   }
+
+   for ( i=bytes-2; i>=0; i-- ) {
+      char_swap(buf[i], buf[pos[i]]);
+   }
+
+   delete [] pos;
+}