DtMmdb: move to lib directory as a standalone library.

2022-01-13 00:15:14 +08:00
parent f3baea9faa
commit e93b2bc626
589 changed files with 31 additions and 2985 deletions
--- a/cde/lib/DtMmdb/storage/spointer.h
+++ b/cde/lib/DtMmdb/storage/spointer.h
@@ -0,0 +1,140 @@
+/*
+ * 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: spointer.h /main/6 1996/07/18 16:35:10 drk $ */
+
+#ifndef _spointer_h
+#define _spointer_h 1
+
+////////////////////////////////////////////////////////////
+// Macros to manipulate page number and item number components.
+//
+//  Variable definitions:
+//	x: compacted representation of page id and item 
+//         index in the page;
+//      y: page size;
+//      u: page id;
+//      v: item index in the page;
+////////////////////////////////////////////////////////////
+#define PAGE_ID(x, y)  ( unsigned(x) >> pos_of_LSB(y) )
+#define PAGE_IDX(x, y)  ( unsigned(x) & ~(~0 << pos_of_LSB(y)) )
+#define FORM_PAGE_REF(u, v, y) ( ((u) << pos_of_LSB(y)) | PAGE_IDX((v), (y)) )
+
+
+////////////////////////////////////////////////////////////
+// .  page class. group of pages are under LRU management;
+// .  use buffer to hold page content (implementation);
+// .  LRU implementation is made possible by defining 'lru' 
+//    as one of the base class.
+////////////////////////////////////////////////////////////
+
+
+#define HEADER_MASK 0xf
+
+struct header_t 
+{
+#ifdef MMDB_BIG_ENDIAN
+   unsigned spointer    : 14;
+   unsigned length      : 14;
+   unsigned is_object   : 1;
+   unsigned updated	: 1;
+   unsigned first_recd  : 1;
+   unsigned deleted     : 1;
+#else
+   unsigned deleted     : 1;
+   unsigned first_recd  : 1;
+   unsigned updated     : 1;
+   unsigned is_object   : 1;
+   unsigned length      : 14;
+   unsigned spointer    : 14;
+#endif
+};
+
+class spointer_t 
+{
+
+public:
+
+   enum spointer_mode { IS_OBJECT=8, 
+                        UPDATED=4,
+                        FIRST_RECD=2, 
+                        DELETED=1 
+                      };
+
+   spointer_t(char* page_base, int slot_num);
+   spointer_t(char* page_base, int slot_num, int ofst, int len); 
+   ~spointer_t();
+
+   void set_mode(spointer_mode, Boolean);
+   Boolean get_mode(spointer_mode);
+   void add_mode(int m) { 
+      header.int_view |= (HEADER_MASK & m); 
+      set_mode(UPDATED, true);
+   };
+   Boolean test_mode(unsigned int m) {
+      return ( (header.int_view & HEADER_MASK & m) == m ) ? true : false;
+   };
+
+   mmdb_pos_t forward_ptr() { return fwd_ptr; };
+   int string_leng() {
+      return int(header.bit_view.length);
+   };
+
+   int string_ofst() {
+      return int(header.bit_view.spointer);
+   };
+
+   void set_string_leng(int l) {
+      header.bit_view.length = l;
+      set_mode(UPDATED, true);
+   };
+   void set_string_ofst(int ofst) {
+      header.bit_view.spointer = ofst; 
+      set_mode(UPDATED, true);
+   };
+
+   void set_forward_ptr(mmdb_pos_t ptr) { 
+      fwd_ptr = ptr; 
+      set_mode(UPDATED, true);
+   };
+
+   void swap_order() {
+      ORDER_SWAP_LONG(fwd_ptr);
+      ORDER_SWAP_UINT(header.int_view);
+      swapped = true;
+   };
+
+   friend class page;
+   friend class page_storage;
+
+protected:
+   mmdb_pos_t fwd_ptr;
+   union {
+      header_t bit_view;
+      unsigned int int_view;
+   } header;
+
+   char* page_image;
+   Boolean swapped;
+};
+
+#endif