![Evan Huus](/assets/img/avatar_default.png)
use a 1500-byte string as a key, so be it. It will be slow, but at least it will work. Fixes https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9078 svn path=/trunk/; revision=52261
737 lines
18 KiB
C
737 lines
18 KiB
C
/* wmem_tree.c
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* 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 2013, Evan Huus <eapache@gmail.com>
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*
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* $Id$
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <ctype.h>
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#include <string.h>
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#include <stdio.h>
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#include <glib.h>
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#include "wmem_core.h"
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#include "wmem_tree.h"
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#include "wmem_user_cb.h"
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typedef enum _wmem_node_color_t {
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WMEM_NODE_COLOR_RED,
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WMEM_NODE_COLOR_BLACK
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} wmem_node_color_t;
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struct _wmem_tree_node_t {
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struct _wmem_tree_node_t *parent;
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struct _wmem_tree_node_t *left;
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struct _wmem_tree_node_t *right;
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void *data;
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guint32 key32;
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wmem_node_color_t color;
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gboolean is_subtree;
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};
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typedef struct _wmem_tree_node_t wmem_tree_node_t;
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struct _wmem_tree_t {
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wmem_allocator_t *master;
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wmem_allocator_t *allocator;
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wmem_tree_node_t *root;
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guint master_cb_id;
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guint slave_cb_id;
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};
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static wmem_tree_node_t *
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node_uncle(wmem_tree_node_t *node)
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{
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wmem_tree_node_t *parent, *grandparent;
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parent = node->parent;
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if (parent == NULL) {
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return NULL;
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}
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grandparent = parent->parent;
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if (grandparent == NULL) {
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return NULL;
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}
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if (parent == grandparent->left) {
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return grandparent->right;
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}
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else {
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return grandparent->left;
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}
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}
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static void rb_insert_case1(wmem_tree_t *tree, wmem_tree_node_t *node);
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static void rb_insert_case2(wmem_tree_t *tree, wmem_tree_node_t *node);
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static void
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rotate_left(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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if (node->parent) {
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if (node->parent->left == node) {
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node->parent->left = node->right;
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}
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else {
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node->parent->right = node->right;
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}
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}
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else {
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tree->root = node->right;
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}
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node->right->parent = node->parent;
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node->parent = node->right;
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node->right = node->right->left;
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if (node->right) {
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node->right->parent = node;
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}
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node->parent->left = node;
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}
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static void
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rotate_right(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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if (node->parent) {
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if (node->parent->left == node) {
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node->parent->left = node->left;
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}
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else {
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node->parent->right = node->left;
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}
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}
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else {
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tree->root = node->left;
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}
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node->left->parent = node->parent;
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node->parent = node->left;
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node->left = node->left->right;
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if (node->left) {
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node->left->parent = node;
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}
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node->parent->right = node;
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}
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static void
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rb_insert_case5(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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wmem_tree_node_t *parent, *grandparent;
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parent = node->parent;
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grandparent = parent->parent;
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parent->color = WMEM_NODE_COLOR_BLACK;
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grandparent->color = WMEM_NODE_COLOR_RED;
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if (node == parent->left && parent == grandparent->left) {
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rotate_right(tree, grandparent);
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}
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else {
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rotate_left(tree, grandparent);
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}
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}
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static void
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rb_insert_case4(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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wmem_tree_node_t *parent, *grandparent;
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parent = node->parent;
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grandparent = parent->parent;
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if (!grandparent) {
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return;
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}
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if (node == parent->right && parent == grandparent->left) {
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rotate_left(tree, parent);
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node = node->left;
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}
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else if (node == parent->left && parent == grandparent->right) {
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rotate_right(tree, parent);
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node = node->right;
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}
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rb_insert_case5(tree, node);
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}
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static void
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rb_insert_case3(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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wmem_tree_node_t *parent, *grandparent, *uncle;
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uncle = node_uncle(node);
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if (uncle && uncle->color == WMEM_NODE_COLOR_RED) {
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parent = node->parent;
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grandparent = parent->parent;
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parent->color = WMEM_NODE_COLOR_BLACK;
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uncle->color = WMEM_NODE_COLOR_BLACK;
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grandparent->color = WMEM_NODE_COLOR_RED;
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rb_insert_case1(tree, grandparent);
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}
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else {
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rb_insert_case4(tree, node);
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}
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}
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static void
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rb_insert_case2(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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/* parent is always non-NULL here */
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if (node->parent->color == WMEM_NODE_COLOR_RED) {
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rb_insert_case3(tree, node);
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}
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}
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static void
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rb_insert_case1(wmem_tree_t *tree, wmem_tree_node_t *node)
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{
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wmem_tree_node_t *parent = node->parent;
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if (parent == NULL) {
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node->color = WMEM_NODE_COLOR_BLACK;
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}
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else {
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rb_insert_case2(tree, node);
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}
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}
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wmem_tree_t *
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wmem_tree_new(wmem_allocator_t *allocator)
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{
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wmem_tree_t *tree;
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tree = wmem_new(allocator, wmem_tree_t);
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tree->master = allocator;
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tree->allocator = allocator;
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tree->root = NULL;
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return tree;
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}
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static gboolean
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wmem_tree_reset_cb(wmem_allocator_t *allocator _U_, wmem_cb_event_t event,
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void *user_data)
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{
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wmem_tree_t *tree = (wmem_tree_t *)user_data;
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tree->root = NULL;
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if (event == WMEM_CB_DESTROY_EVENT) {
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wmem_unregister_callback(tree->master, tree->master_cb_id);
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wmem_free(tree->master, tree);
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}
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return TRUE;
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}
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static gboolean
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wmem_tree_destroy_cb(wmem_allocator_t *allocator _U_, wmem_cb_event_t event _U_,
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void *user_data)
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{
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wmem_tree_t *tree = (wmem_tree_t *)user_data;
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wmem_unregister_callback(tree->allocator, tree->slave_cb_id);
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return FALSE;
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}
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wmem_tree_t *
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wmem_tree_new_autoreset(wmem_allocator_t *master, wmem_allocator_t *slave)
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{
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wmem_tree_t *tree;
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tree = wmem_new(master, wmem_tree_t);
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tree->master = master;
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tree->allocator = slave;
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tree->root = NULL;
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tree->master_cb_id = wmem_register_callback(master, wmem_tree_destroy_cb,
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tree);
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tree->slave_cb_id = wmem_register_callback(slave, wmem_tree_reset_cb,
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tree);
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return tree;
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}
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gboolean
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wmem_tree_is_empty(wmem_tree_t *tree)
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{
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return tree->root == NULL;
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}
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static wmem_tree_node_t *
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create_node(wmem_allocator_t *allocator, wmem_tree_node_t *parent, guint32 key,
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void *data, wmem_node_color_t color, gboolean is_subtree)
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{
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wmem_tree_node_t *node;
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node = wmem_new(allocator, wmem_tree_node_t);
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node->left = NULL;
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node->right = NULL;
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node->parent = parent;
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node->key32 = key;
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node->data = data;
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node->color = color;
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node->is_subtree = is_subtree;
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return node;
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}
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#define CREATE_DATA(TRANSFORM, DATA) ((TRANSFORM) ? (TRANSFORM)(DATA) : (DATA))
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static void *
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lookup_or_insert32(wmem_tree_t *tree, guint32 key,
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void*(*func)(void*), void* data, gboolean is_subtree, gboolean replace)
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{
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wmem_tree_node_t *node = tree->root;
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wmem_tree_node_t *new_node = NULL;
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/* is this the first node ?*/
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if (!node) {
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new_node = create_node(tree->allocator, NULL, key,
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CREATE_DATA(func, data), WMEM_NODE_COLOR_BLACK, is_subtree);
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tree->root = new_node;
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return new_node->data;
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}
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/* it was not the new root so walk the tree until we find where to
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* insert this new leaf.
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*/
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while (!new_node) {
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/* this node already exists, so just return the data pointer*/
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if (key == node->key32) {
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if (replace) {
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node->data = CREATE_DATA(func, data);
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}
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return node->data;
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}
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else if (key < node->key32) {
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if (node->left) {
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node = node->left;
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}
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else {
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/* new node to the left */
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new_node = create_node(tree->allocator, node, key,
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CREATE_DATA(func, data), WMEM_NODE_COLOR_RED,
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is_subtree);
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node->left = new_node;
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}
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}
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else if (key > node->key32) {
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if (node->right) {
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node = node->right;
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}
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else {
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/* new node to the right */
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new_node = create_node(tree->allocator, node, key,
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CREATE_DATA(func, data), WMEM_NODE_COLOR_RED,
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is_subtree);
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node->right = new_node;
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}
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}
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}
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/* node will now point to the newly created node */
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rb_insert_case1(tree, new_node);
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return new_node->data;
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}
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void
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wmem_tree_insert32(wmem_tree_t *tree, guint32 key, void *data)
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{
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lookup_or_insert32(tree, key, NULL, data, FALSE, TRUE);
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}
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void *
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wmem_tree_lookup32(wmem_tree_t *tree, guint32 key)
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{
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wmem_tree_node_t *node = tree->root;
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while (node) {
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if (key == node->key32) {
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return node->data;
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}
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else if (key < node->key32) {
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node = node->left;
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}
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else if (key > node->key32) {
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node = node->right;
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}
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}
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return NULL;
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}
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void *
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wmem_tree_lookup32_le(wmem_tree_t *tree, guint32 key)
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{
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wmem_tree_node_t *node = tree->root;
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while (node) {
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if (key == node->key32) {
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return node->data;
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}
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else if (key < node->key32) {
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if (node->left == NULL) {
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break;
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}
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node = node->left;
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}
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else if (key > node->key32) {
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if (node->right == NULL) {
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break;
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}
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node = node->right;
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}
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}
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if (!node) {
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return NULL;
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}
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/* If we are still at the root of the tree this means that this node
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* is either smaller than the search key and then we return this
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* node or else there is no smaller key available and then
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* we return NULL.
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*/
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if (node->parent == NULL) {
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if (key > node->key32) {
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return node->data;
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} else {
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return NULL;
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}
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}
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if (node->key32 <= key) {
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/* if our key is <= the search key, we have the right node */
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return node->data;
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}
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else if (node == node->parent->left) {
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/* our key is bigger than the search key and we're a left child,
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* we have to check if any of our ancestors are smaller. */
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while (node) {
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if (key > node->key32) {
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return node->data;
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}
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node=node->parent;
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}
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return NULL;
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}
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else {
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/* our key is bigger than the search key and we're a right child,
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* our parent is the one we want */
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return node->parent->data;
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}
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}
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/* Strings are stored as an array of uint32 containing the string characters
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with 4 characters in each uint32.
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The first byte of the string is stored as the most significant byte.
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If the string is not a multiple of 4 characters in length the last
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uint32 containing the string bytes are padded with 0 bytes.
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After the uint32's containing the string, there is one final terminator
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uint32 with the value 0x00000001
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*/
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static guint32 *
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pack_string(const gchar *key, guint32 *divx, guint32 flags)
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{
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guint32 *aligned = NULL;
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guint32 len = (guint32) strlen(key);
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guint32 i;
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guint32 tmp;
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*divx = (len+3)/4 + 1;
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aligned = (guint32 *)wmem_alloc(NULL, *divx * sizeof (guint32));
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/* pack the bytes one one by one into guint32s */
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tmp = 0;
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for (i = 0;i < len;i++) {
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unsigned char ch;
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ch = (unsigned char)key[i];
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if (flags & WMEM_TREE_STRING_NOCASE) {
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if (isupper(ch)) {
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ch = tolower(ch);
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}
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}
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tmp <<= 8;
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tmp |= ch;
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if (i%4 == 3) {
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aligned[i/4] = tmp;
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tmp = 0;
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}
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}
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/* add required padding to the last uint32 */
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if (i%4 != 0) {
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while (i%4 != 0) {
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i++;
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tmp <<= 8;
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}
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aligned[i/4-1] = tmp;
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}
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/* add the terminator */
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aligned[*divx-1] = 0x00000001;
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return aligned;
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}
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void
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wmem_tree_insert_string(wmem_tree_t* tree, const gchar* k, void* v, guint32 flags)
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{
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wmem_tree_key_t key[2];
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guint32 *aligned;
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guint32 divx;
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aligned = pack_string(k, &divx, flags);
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key[0].length = divx;
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key[0].key = aligned;
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key[1].length = 0;
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key[1].key = NULL;
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wmem_tree_insert32_array(tree, key, v);
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wmem_free(NULL, aligned);
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}
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void *
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wmem_tree_lookup_string(wmem_tree_t* tree, const gchar* k, guint32 flags)
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{
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wmem_tree_key_t key[2];
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guint32 *aligned;
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guint32 divx;
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void *ret;
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aligned = pack_string(k, &divx, flags);
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key[0].length = divx;
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key[0].key = aligned;
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key[1].length = 0;
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key[1].key = NULL;
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ret = wmem_tree_lookup32_array(tree, key);
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wmem_free(NULL, aligned);
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return ret;
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}
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static void *
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create_sub_tree(void* d)
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{
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return wmem_tree_new(((wmem_tree_t *)d)->allocator);
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}
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void
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wmem_tree_insert32_array(wmem_tree_t *tree, wmem_tree_key_t *key, void *data)
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{
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wmem_tree_t *insert_tree = NULL;
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wmem_tree_key_t *cur_key;
|
|
guint32 i, insert_key32 = 0;
|
|
|
|
for (cur_key = key; cur_key->length > 0; cur_key++) {
|
|
for (i = 0; i < cur_key->length; i++) {
|
|
/* Insert using the previous key32 */
|
|
if (!insert_tree) {
|
|
insert_tree = tree;
|
|
} else {
|
|
insert_tree = (wmem_tree_t *)lookup_or_insert32(insert_tree,
|
|
insert_key32, create_sub_tree, tree, TRUE, FALSE);
|
|
}
|
|
insert_key32 = cur_key->key[i];
|
|
}
|
|
}
|
|
|
|
g_assert(insert_tree);
|
|
|
|
wmem_tree_insert32(insert_tree, insert_key32, data);
|
|
}
|
|
|
|
void *
|
|
wmem_tree_lookup32_array_helper(wmem_tree_t *tree, wmem_tree_key_t *key,
|
|
void*(*helper)(wmem_tree_t*, guint32))
|
|
{
|
|
wmem_tree_t *lookup_tree = NULL;
|
|
wmem_tree_key_t *cur_key;
|
|
guint32 i, lookup_key32 = 0;
|
|
|
|
if (!tree || !key) {
|
|
return NULL;
|
|
}
|
|
|
|
for (cur_key = key; cur_key->length > 0; cur_key++) {
|
|
for (i = 0; i < cur_key->length; i++) {
|
|
/* Lookup using the previous key32 */
|
|
if (!lookup_tree) {
|
|
lookup_tree = tree;
|
|
}
|
|
else {
|
|
lookup_tree =
|
|
(wmem_tree_t *)(*helper)(lookup_tree, lookup_key32);
|
|
if (!lookup_tree) {
|
|
return NULL;
|
|
}
|
|
}
|
|
lookup_key32 = cur_key->key[i];
|
|
}
|
|
}
|
|
|
|
/* Assert if we didn't get any valid keys */
|
|
g_assert(lookup_tree);
|
|
|
|
return (*helper)(lookup_tree, lookup_key32);
|
|
}
|
|
|
|
void *
|
|
wmem_tree_lookup32_array(wmem_tree_t *tree, wmem_tree_key_t *key)
|
|
{
|
|
return wmem_tree_lookup32_array_helper(tree, key, wmem_tree_lookup32);
|
|
}
|
|
|
|
void *
|
|
wmem_tree_lookup32_array_le(wmem_tree_t *tree, wmem_tree_key_t *key)
|
|
{
|
|
return wmem_tree_lookup32_array_helper(tree, key, wmem_tree_lookup32_le);
|
|
}
|
|
|
|
static gboolean
|
|
wmem_tree_foreach_nodes(wmem_tree_node_t* node, wmem_foreach_func callback,
|
|
void *user_data)
|
|
{
|
|
gboolean stop_traverse = FALSE;
|
|
|
|
if (!node) {
|
|
return FALSE;
|
|
}
|
|
|
|
if (node->left) {
|
|
if (wmem_tree_foreach_nodes(node->left, callback, user_data)) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
if (node->is_subtree == TRUE) {
|
|
stop_traverse = wmem_tree_foreach((wmem_tree_t *)node->data,
|
|
callback, user_data);
|
|
} else {
|
|
stop_traverse = callback(node->data, user_data);
|
|
}
|
|
|
|
if (stop_traverse) {
|
|
return TRUE;
|
|
}
|
|
|
|
if(node->right) {
|
|
if (wmem_tree_foreach_nodes(node->right, callback, user_data)) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
gboolean
|
|
wmem_tree_foreach(wmem_tree_t* tree, wmem_foreach_func callback,
|
|
void *user_data)
|
|
{
|
|
if(!tree->root)
|
|
return FALSE;
|
|
|
|
return wmem_tree_foreach_nodes(tree->root, callback, user_data);
|
|
}
|
|
|
|
static void wmem_print_subtree(wmem_tree_t *tree, guint32 level);
|
|
|
|
static void
|
|
wmem_tree_print_nodes(const char *prefix, wmem_tree_node_t *node, guint32 level)
|
|
{
|
|
guint32 i;
|
|
|
|
if (!node)
|
|
return;
|
|
|
|
for (i=0; i<level; i++) {
|
|
printf(" ");
|
|
}
|
|
|
|
printf("%sNODE:%p parent:%p left:%p right:%p colour:%s key:%u %s:%p\n",
|
|
prefix,
|
|
(void *)node, (void *)node->parent,
|
|
(void *)node->left, (void *)node->right,
|
|
node->color?"Black":"Red", node->key32,
|
|
node->is_subtree?"tree":"data", node->data);
|
|
if (node->left)
|
|
wmem_tree_print_nodes("L-", node->left, level+1);
|
|
if (node->right)
|
|
wmem_tree_print_nodes("R-", node->right, level+1);
|
|
|
|
if (node->is_subtree)
|
|
wmem_print_subtree((wmem_tree_t *)node->data, level+1);
|
|
}
|
|
|
|
static void
|
|
wmem_print_subtree(wmem_tree_t *tree, guint32 level)
|
|
{
|
|
guint32 i;
|
|
|
|
if (!tree)
|
|
return;
|
|
|
|
for (i=0; i<level; i++) {
|
|
printf(" ");
|
|
}
|
|
|
|
printf("WMEM tree:%p root:%p\n", (void *)tree, (void *)tree->root);
|
|
if (tree->root) {
|
|
wmem_tree_print_nodes("Root-", tree->root, level);
|
|
}
|
|
}
|
|
|
|
void
|
|
wmem_print_tree(wmem_tree_t *tree)
|
|
{
|
|
wmem_print_subtree(tree, 0);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|