2 * Copyright (c) 2001-2002, David Janssens
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
35 void tgt_reset(tgt_tree_t * tree)
39 if (!tree || tree == NULL)
42 for (i = 0; i < tree->numnodes; i++) {
43 tree->nodes[i].value = 999;
44 tree->nodes[i].low = 0;
45 tree->nodes[i].known = 0;
50 /* Create tag-tree. */
52 tgt_tree_t *tgt_create(int numleafsh, int numleafsv)
57 tgt_node_t *parentnode;
58 tgt_node_t *parentnode0;
64 tree = (tgt_tree_t *) malloc(sizeof(tgt_tree_t));
65 tree->numleafsh = numleafsh;
66 tree->numleafsv = numleafsv;
73 n = nplh[numlvls] * nplv[numlvls];
74 nplh[numlvls + 1] = (nplh[numlvls] + 1) / 2;
75 nplv[numlvls + 1] = (nplv[numlvls] + 1) / 2;
81 if (tree->numnodes == 0) {
86 tree->nodes = (tgt_node_t *) malloc(tree->numnodes * sizeof(tgt_node_t));
89 parentnode = &tree->nodes[tree->numleafsh * tree->numleafsv];
90 parentnode0 = parentnode;
92 for (i = 0; i < numlvls - 1; ++i) {
93 for (j = 0; j < nplv[i]; ++j) {
96 node->parent = parentnode;
99 node->parent = parentnode;
104 if ((j & 1) || j == nplv[i] - 1) {
105 parentnode0 = parentnode;
107 parentnode = parentnode0;
108 parentnode0 += nplh[i];
120 /* Destroy tag-tree. */
122 void tgt_destroy(tgt_tree_t * t)
129 /* Set the value of a leaf of the tag-tree. */
131 void tgt_setvalue(tgt_tree_t * tree, int leafno, int value)
134 node = &tree->nodes[leafno];
135 while (node && node->value > value) {
142 /* Encode the value of a leaf of the tag-tree. */
144 void tgt_encode(tgt_tree_t * tree, int leafno, int threshold)
152 node = &tree->nodes[leafno];
153 while (node->parent) {
160 if (low > node->low) {
166 while (low < threshold) {
167 if (low >= node->value) {
187 /* Decode the value of a leaf of the tag-tree. */
189 int tgt_decode(tgt_tree_t * tree, int leafno, int threshold)
197 node = &tree->nodes[leafno];
198 while (node->parent) {
205 if (low > node->low) {
210 while (low < threshold && low < node->value) {
224 return (node->value < threshold) ? 1 : 0;