Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtinfo/DtMmdb/hmphf/params.C

@@ -0,0 +1,80 @@
+/*
+ * $XConsortium: params.cc /main/4 1996/07/18 14:33:30 drk $
+ *
+ * Copyright (c) 1993 HAL Computer Systems International, Ltd.
+ * All rights reserved.  Unpublished -- rights reserved under
+ * the Copyright Laws of the United States.  USE OF A COPYRIGHT
+ * NOTICE IS PRECAUTIONARY ONLY AND DOES NOT IMPLY PUBLICATION
+ * OR DISCLOSURE.
+ * 
+ * THIS SOFTWARE CONTAINS CONFIDENTIAL INFORMATION AND TRADE
+ * SECRETS OF HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.  USE,
+ * DISCLOSURE, OR REPRODUCTION IS PROHIBITED WITHOUT THE
+ * PRIOR EXPRESS WRITTEN PERMISSION OF HAL COMPUTER SYSTEMS
+ * INTERNATIONAL, LTD.
+ * 
+ *                         RESTRICTED RIGHTS LEGEND
+ * Use, duplication, or disclosure by the Government is subject
+ * to the restrictions as set forth in subparagraph (c)(l)(ii)
+ * of the Rights in Technical Data and Computer Software clause
+ * at DFARS 252.227-7013.
+ *
+ *          HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.
+ *                  1315 Dell Avenue
+ *                  Campbell, CA  95008
+ * 
+ */
+
+
+#include "hmphf/params.h"
+
+struct partition_t {
+   int upper_bound;
+   float bits;
+   float p1;
+   float p2;
+} partition_tbl [] = {
+   {100, 3.2, 0.52, 0.31}, {1000, 3.4, 0.55, 0.3}, {10000, 3.4, 0.57, 0.29},
+   {MAXINT, 4.2, 0.58, 0.3} 
+};
+
+void params::select_value(float bts)  
+{
+   for ( int i=0; ; i++ ) {
+      if ( v_n <= partition_tbl[i].upper_bound )
+         break;
+   }
+
+   if ( bts == 0.0 )
+      v_bits = partition_tbl[i].bits;
+   else
+      v_bits = bts;
+
+   v_r = 0;
+   v_b = ( v_n > 0 ) ? (int)( float(v_n*v_bits) / (1.0+flog2(v_n)) ) : 0;
+
+   v_p1 = (int)( partition_tbl[i].p1 * v_n);
+   v_p2 = (int)( partition_tbl[i].p2 * v_b);
+
+   if ( v_p1 == 0 ) v_p1++;
+   if ( v_p2 == 0 ) v_p2++;
+
+   v_seed = 1;
+}
+
+void params::re_select_value()  
+{
+   select_value(v_bits+0.2);
+}
+
+ostream& operator<<(ostream& out, params& pms)
+{
+   debug(out, pms.v_n);
+   debug(out, pms.v_b);
+   debug(out, pms.v_p1);
+   debug(out, pms.v_p2);
+   debug(out, (int)pms.v_bits);
+   debug(out, pms.v_r);
+   debug(out, pms.v_seed);
+   return out;
+}