openjpeg/libopenjpeg/tgt.c

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/*
* Copyright (c) 2001-2002, David Janssens
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "tgt.h"
#include "bio.h"
#include <stdlib.h>
#include <stdio.h>
/* <summary> */
/* Reset tag-tree. */
/* </summary> */
void tgt_reset(tgt_tree_t * tree)
{
int i;
/* new */
if (!tree || tree == NULL)
return;
for (i = 0; i < tree->numnodes; i++) {
tree->nodes[i].value = 999;
tree->nodes[i].low = 0;
tree->nodes[i].known = 0;
}
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}
/* <summary> */
/* Create tag-tree. */
/* </summary> */
tgt_tree_t *tgt_create(int numleafsh, int numleafsv)
{
int nplh[32];
int nplv[32];
tgt_node_t *node;
tgt_node_t *parentnode;
tgt_node_t *parentnode0;
tgt_tree_t *tree;
int i, j, k;
int numlvls;
int n;
tree = (tgt_tree_t *) malloc(sizeof(tgt_tree_t));
tree->numleafsh = numleafsh;
tree->numleafsv = numleafsv;
numlvls = 0;
nplh[0] = numleafsh;
nplv[0] = numleafsv;
tree->numnodes = 0;
do {
n = nplh[numlvls] * nplv[numlvls];
nplh[numlvls + 1] = (nplh[numlvls] + 1) / 2;
nplv[numlvls + 1] = (nplv[numlvls] + 1) / 2;
tree->numnodes += n;
++numlvls;
} while (n > 1);
/* ADD */
if (tree->numnodes == 0) {
free(tree);
return NULL;
}
tree->nodes = (tgt_node_t *) malloc(tree->numnodes * sizeof(tgt_node_t));
node = tree->nodes;
parentnode = &tree->nodes[tree->numleafsh * tree->numleafsv];
parentnode0 = parentnode;
for (i = 0; i < numlvls - 1; ++i) {
for (j = 0; j < nplv[i]; ++j) {
k = nplh[i];
while (--k >= 0) {
node->parent = parentnode;
++node;
if (--k >= 0) {
node->parent = parentnode;
++node;
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}
++parentnode;
}
if ((j & 1) || j == nplv[i] - 1) {
parentnode0 = parentnode;
} else {
parentnode = parentnode0;
parentnode0 += nplh[i];
}
}
}
node->parent = 0;
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tgt_reset(tree);
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return tree;
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}
/* <summary> */
/* Destroy tag-tree. */
/* </summary> */
void tgt_destroy(tgt_tree_t * t)
{
free(t->nodes);
free(t);
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}
/* <summary> */
/* Set the value of a leaf of the tag-tree. */
/* </summary> */
void tgt_setvalue(tgt_tree_t * tree, int leafno, int value)
{
tgt_node_t *node;
node = &tree->nodes[leafno];
while (node && node->value > value) {
node->value = value;
node = node->parent;
}
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}
/* <summary> */
/* Encode the value of a leaf of the tag-tree. */
/* </summary> */
void tgt_encode(tgt_tree_t * tree, int leafno, int threshold)
{
tgt_node_t *stk[31];
tgt_node_t **stkptr;
tgt_node_t *node;
int low;
stkptr = stk;
node = &tree->nodes[leafno];
while (node->parent) {
*stkptr++ = node;
node = node->parent;
}
low = 0;
for (;;) {
if (low > node->low) {
node->low = low;
} else {
low = node->low;
}
while (low < threshold) {
if (low >= node->value) {
if (!node->known) {
bio_write(1, 1);
node->known = 1;
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}
break;
}
bio_write(0, 1);
++low;
}
node->low = low;
if (stkptr == stk)
break;
node = *--stkptr;
}
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}
/* <summary> */
/* Decode the value of a leaf of the tag-tree. */
/* </summary> */
int tgt_decode(tgt_tree_t * tree, int leafno, int threshold)
{
tgt_node_t *stk[31];
tgt_node_t **stkptr;
tgt_node_t *node;
int low;
stkptr = stk;
node = &tree->nodes[leafno];
while (node->parent) {
*stkptr++ = node;
node = node->parent;
}
low = 0;
for (;;) {
if (low > node->low) {
node->low = low;
} else {
low = node->low;
}
while (low < threshold && low < node->value) {
if (bio_read(1)) {
node->value = low;
} else {
++low;
}
}
node->low = low;
if (stkptr == stk) {
break;
}
node = *--stkptr;
}
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return (node->value < threshold) ? 1 : 0;
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}