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