Import changeset

1 files changed, 75 insertions, 0 deletions

diff --git a/include/my_tree.h b/include/my_tree.h
new file mode 100644
index 00000000000..84815591e36
--- /dev/null
+++ b/include/my_tree.h
@@ -0,0 +1,75 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+#ifndef _tree_h
+#define _tree_h
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define MAX_TREE_HIGHT	40	/* = max 1048576 leafs in tree */
+#define ELEMENT_KEY(tree,element)\
+(tree->offset_to_key ? (void*)((byte*) element+tree->offset_to_key) :\
+			*((void**) (element+1)))
+
+#define tree_set_pointer(element,ptr) *((byte **) (element+1))=((byte*) (ptr))
+
+typedef enum { left_root_right, right_root_left } TREE_WALK;
+typedef uint32 element_count;
+typedef int (*tree_walk_action)(void *,element_count,void *);
+
+#ifdef MSDOS
+typedef struct st_tree_element {
+  struct st_tree_element *left,*right;
+  unsigned long count;
+  uchar    colour;			/* black is marked as 1 */
+} TREE_ELEMENT;
+#else
+typedef struct st_tree_element {
+  struct st_tree_element *left,*right;
+  uint32 count:31,
+	 colour:1;			/* black is marked as 1 */
+} TREE_ELEMENT;
+#endif /* MSDOS */
+
+typedef struct st_tree {
+  TREE_ELEMENT *root,null_element;
+  TREE_ELEMENT **parents[MAX_TREE_HIGHT];
+  uint offset_to_key,elements_in_tree,size_of_element;
+  qsort_cmp compare;
+  MEM_ROOT mem_root;
+  my_bool with_delete;
+  void (*free)(void *);
+} TREE;
+
+	/* Functions on hole tree */
+void init_tree(TREE *tree,uint default_alloc_size, int element_size,
+	       qsort_cmp compare, my_bool with_delete,
+	       void (*free_element)(void*));
+void delete_tree(TREE*);
+
+	/* Functions on leafs */
+TREE_ELEMENT *tree_insert(TREE *tree,void *key,uint key_size);
+void *tree_search(TREE *tree,void *key);
+int tree_walk(TREE *tree,tree_walk_action action,
+	      void *argument, TREE_WALK visit);
+int tree_delete(TREE *tree,void *key);
+
+#ifdef	__cplusplus
+}
+#endif
+#endif