forked from osmocom/wireshark
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/** @file
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* Definitions for the Wireshark Memory Manager Red-Black Tree
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* Based on the red-black tree implementation in epan/emem.*
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* Copyright 2015, Matthieu coudron <matthieu.coudron@lip6.fr>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __WMEM_INTERVAL_TREE_H__
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#define __WMEM_INTERVAL_TREE_H__
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#include "wmem_core.h"
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#include "wmem_tree.h"
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#include "wmem_list.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/** @addtogroup wmem
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* @{
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* @defgroup wmem-interval-tree Interval Tree
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*
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* http://www.geeksforgeeks.org/interval-tree/
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* The idea is to augment a self-balancing Binary Search Tree (BST) like Red Black Tree, AVL Tree, etc ...
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* to maintain a set of intervals so that all operations can be done in O(Logn) time.
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* @{
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* Following wikipedia's convention this is an augmented tree rather then an interval tree
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* http://www.wikiwand.com/en/Interval_tree
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*/
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struct _wmem_tree_t;
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typedef struct _wmem_tree_t wmem_itree_t;
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struct _wmem_range_t {
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guint64 low; /* low is used as the key in the binary tree */
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guint64 high; /* Max value of the range */
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guint64 max_edge; /* max value among subtrees */
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};
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WS_DLL_PUBLIC
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wmem_itree_t *
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wmem_itree_new(wmem_allocator_t *allocator)
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G_GNUC_MALLOC;
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/** Returns true if the tree is empty (has no nodes). */
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WS_DLL_PUBLIC
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gboolean
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wmem_itree_is_empty(wmem_itree_t *tree);
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/** Inserts a range low-high indexed by "low" in O(log(n)).
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* As in wmem_tree, if a key "low" already exists, it will be overwritten with the new data
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*
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*/
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WS_DLL_PUBLIC
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void
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wmem_itree_insert(wmem_itree_t *tree, const guint64 low, const guint64 high, void *data);
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/*
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* Save results in a wmem_list with the scope passed as a parameter.
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* wmem_list_t is always allocated even if there is no result
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*/
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WS_DLL_PUBLIC
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wmem_list_t *
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wmem_itree_find_intervals(wmem_itree_t *tree, wmem_allocator_t *allocator, guint64 low, guint64 high);
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/**
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* Print ranges along the tree
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*/
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void
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wmem_print_itree(wmem_itree_t *tree);
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/** @}
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* @} */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __WMEM_INTERVAL_TREE_H__ */
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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