/*
* 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>
/// <summary>
/// Reset tag-tree.
/// </summary>
void tgt_reset(tgt_tree_t *tree)
{
int i;
for (i=0; i<tree->numnodes; i++) {
tree->nodes[i].value=999;
tree->nodes[i].low=0;
tree->nodes[i].known=0;
}
}
/// <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);
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;
}
++parentnode;
}
if ((j&1)||j==nplv[i]-1) {
parentnode0=parentnode;
} else {
parentnode=parentnode0;
parentnode0+=nplh[i];
}
}
}
node->parent=0;
tgt_reset(tree);
return tree;
}
/// <summary>
/// Destroy tag-tree.
/// </summary>
void tgt_destroy(tgt_tree_t *t) {
free(t->nodes);
free(t);
}
/// <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;
}
}
/// <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;
}
break;
}
bio_write(0, 1);
++low;
}
node->low=low;
if (stkptr==stk) break;
node=*--stkptr;
}
}
/// <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;
}
return (node->value<threshold)?1:0;
}
Submit an article or tip