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// Copyright (C) 2018 Red Hat, Inc. All rights reserved.
//
// This file is part of LVM2.
//
// This copyrighted material is made available to anyone wishing to use,
// modify, copy, or redistribute it subject to the terms and conditions
// of the GNU Lesser General Public License v.2.1.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef BASE_DATA_STRUCT_RADIX_TREE_H
#define BASE_DATA_STRUCT_RADIX_TREE_H
#include "configure.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
//----------------------------------------------------------------
struct radix_tree;
union radix_value {
void *ptr;
uint64_t n;
};
typedef void (*radix_value_dtr)(void *context, union radix_value v);
// dtr will be called on any deleted entries. dtr may be NULL.
struct radix_tree *radix_tree_create(radix_value_dtr dtr, void *dtr_context);
void radix_tree_destroy(struct radix_tree *rt);
unsigned radix_tree_size(struct radix_tree *rt);
bool radix_tree_insert(struct radix_tree *rt, uint8_t *kb, uint8_t *ke, union radix_value v);
bool radix_tree_remove(struct radix_tree *rt, uint8_t *kb, uint8_t *ke);
// Returns the number of values removed
unsigned radix_tree_remove_prefix(struct radix_tree *rt, uint8_t *prefix_b, uint8_t *prefix_e);
bool radix_tree_lookup(struct radix_tree *rt,
uint8_t *kb, uint8_t *ke, union radix_value *result);
// The radix tree stores entries in lexicographical order. Which means
// we can iterate entries, in order. Or iterate entries with a particular
// prefix.
struct radix_tree_iterator {
// Returns false if the iteration should end.
bool (*visit)(struct radix_tree_iterator *it,
uint8_t *kb, uint8_t *ke, union radix_value v);
};
void radix_tree_iterate(struct radix_tree *rt, uint8_t *kb, uint8_t *ke,
struct radix_tree_iterator *it);
// Checks that some constraints on the shape of the tree are
// being held. For debug only.
bool radix_tree_is_well_formed(struct radix_tree *rt);
void radix_tree_dump(struct radix_tree *rt, FILE *out);
//----------------------------------------------------------------
#endif
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