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      1 /*	$NetBSD: rpst.h,v 1.3 2011/04/14 15:31:20 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c)2009 YAMAMOTO Takashi,
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #if !defined(_SYS_RPST_H_)
     30 #define	_SYS_RPST_H_
     31 
     32 #if defined(_KERNEL) || defined(_STANDALONE)
     33 #include <sys/types.h>
     34 #else /* defined(_KERNEL) || defined(_STANDALONE) */
     35 #include <stdint.h>
     36 #endif /* defined(_KERNEL) || defined(_STANDALONE) */
     37 
     38 struct rpst_tree {
     39 	struct rpst_node *t_root;
     40 	unsigned int t_height;
     41 };
     42 
     43 struct rpst_node {
     44 	struct rpst_node *n_parent;
     45 	struct rpst_node *n_children[2];
     46 	uint64_t n_y;
     47 	uint64_t n_x;
     48 };
     49 
     50 struct rpst_iterator {
     51 	struct rpst_tree *it_tree;
     52 	struct rpst_node *it_cur;
     53 	unsigned int it_idx;
     54 	unsigned int it_level;
     55 	uint64_t it_max_y;
     56 	uint64_t it_min_x;
     57 	uint64_t it_max_x;
     58 };
     59 
     60 void rpst_init_tree(struct rpst_tree *);
     61 struct rpst_node *rpst_insert_node(struct rpst_tree *, struct rpst_node *);
     62 void rpst_remove_node(struct rpst_tree *, struct rpst_node *);
     63 struct rpst_node *rpst_iterate_first(struct rpst_tree *, uint64_t, uint64_t,
     64     uint64_t, struct rpst_iterator *);
     65 struct rpst_node *rpst_iterate_next(struct rpst_iterator *);
     66 
     67 #endif /* !defined(_SYS_RPST_H_) */
     68