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-rw-r--r--media/sphinxbase/src/libsphinxbase/util/heap.c292
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diff --git a/media/sphinxbase/src/libsphinxbase/util/heap.c b/media/sphinxbase/src/libsphinxbase/util/heap.c
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--- a/media/sphinxbase/src/libsphinxbase/util/heap.c
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-/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
-/* ====================================================================
- * Copyright (c) 1999-2004 Carnegie Mellon University. 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 work was supported in part by funding from the Defense Advanced
- * Research Projects Agency and the National Science Foundation of the
- * United States of America, and the CMU Sphinx Speech Consortium.
- *
- * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
- * ANY EXPRESSED 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 CARNEGIE MELLON UNIVERSITY
- * NOR ITS EMPLOYEES 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.
- *
- * ====================================================================
- *
- */
-/*
- * heap.c -- Generic heap structure for inserting in any and popping in sorted
- * order.
- *
- * **********************************************
- * CMU ARPA Speech Project
- *
- * Copyright (c) 1999 Carnegie Mellon University.
- * ALL RIGHTS RESERVED.
- * **********************************************
- *
- * HISTORY
- * $Log: heap.c,v $
- * Revision 1.4 2005/06/22 03:05:49 arthchan2003
- * 1, Fixed doxygen documentation, 2, Add keyword.
- *
- * Revision 1.3 2005/03/30 01:22:48 archan
- * Fixed mistakes in last updates. Add
- *
- *
- * 05-Mar-99 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University
- * Fixed bug in heap_destroy() (in while loop exit condition).
- *
- * 23-Dec-96 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University
- * Started.
- */
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-
-#include "sphinxbase/heap.h"
-#include "sphinxbase/err.h"
-#include "sphinxbase/ckd_alloc.h"
-
-/**
- * One node on the heap
- */
-typedef struct heapnode_s {
- void *data; /**< Application data at this node */
- int32 val; /**< Associated with above application data; according to which
- heap is sorted (in ascending order) */
- int32 nl, nr; /**< #left/right descendants of this node (for balancing heap) */
- struct heapnode_s *l; /**< Root of left descendant heap */
- struct heapnode_s *r; /**< Root of right descendant heap */
-} heapnode_t;
-
-/**
- * Internal heap data structure.
- */
-struct heap_s {
- heapnode_t *top;
-};
-
-
-#if 0
-static void
-heap_dump(heapnode_t * top, int32 level)
-{
- int32 i;
-
- if (!top)
- return;
-
- for (i = 0; i < level; i++)
- printf(" ");
- /* print top info */
- heap_dump(top->l, level + 1);
- heap_dump(top->r, level + 1);
-}
-#endif
-
-
-heap_t *
-heap_new(void)
-{
- heap_t *h = ckd_calloc(1, sizeof(*h));
- return h;
-}
-
-
-static heapnode_t *
-subheap_insert(heapnode_t * root, void *data, int32 val)
-{
- heapnode_t *h;
- void *tmpdata;
- int32 tmpval;
-
- if (!root) {
- h = (heapnode_t *) ckd_calloc(1, sizeof(heapnode_t));
- h->data = data;
- h->val = val;
- h->l = h->r = NULL;
- h->nl = h->nr = 0;
- return h;
- }
-
- /* Root already exists; if new value is less, replace root node */
- if (root->val > val) {
- tmpdata = root->data;
- tmpval = root->val;
- root->data = data;
- root->val = val;
- data = tmpdata;
- val = tmpval;
- }
-
- /* Insert new or old (replaced) node in right or left subtree; keep them balanced */
- if (root->nl > root->nr) {
- root->r = subheap_insert(root->r, data, val);
- root->nr++;
- }
- else {
- root->l = subheap_insert(root->l, data, val);
- root->nl++;
- }
-
- return root;
-}
-
-
-int
-heap_insert(heap_t *heap, void *data, int32 val)
-{
- heap->top = subheap_insert(heap->top, data, val);
- return 0;
-}
-
-
-static heapnode_t *
-subheap_pop(heapnode_t * root)
-{
- heapnode_t *l, *r;
-
- /* Propagate best value from below into root, if any */
- l = root->l;
- r = root->r;
-
- if (!l) {
- if (!r) {
- ckd_free((char *) root);
- return NULL;
- }
- else {
- root->data = r->data;
- root->val = r->val;
- root->r = subheap_pop(r);
- root->nr--;
- }
- }
- else {
- if ((!r) || (l->val < r->val)) {
- root->data = l->data;
- root->val = l->val;
- root->l = subheap_pop(l);
- root->nl--;
- }
- else {
- root->data = r->data;
- root->val = r->val;
- root->r = subheap_pop(r);
- root->nr--;
- }
- }
-
- return root;
-}
-
-
-int
-heap_pop(heap_t *heap, void **data, int32 * val)
-{
- if (heap->top == NULL)
- return 0;
- *data = heap->top->data;
- *val = heap->top->val;
- heap->top = subheap_pop(heap->top);
- return 1;
-}
-
-
-int
-heap_top(heap_t *heap, void **data, int32 * val)
-{
- if (heap->top == NULL)
- return 0;
- *data = heap->top->data;
- *val = heap->top->val;
- return 1;
-}
-
-static int
-heap_remove_one(heap_t *heap, heapnode_t *top, void *data)
-{
- if (top == NULL)
- return -1;
- else if (top->data == data) {
- assert(top == heap->top);
- heap->top = subheap_pop(heap->top);
- return 0;
- }
- if (top->l) {
- if (top->l->data == data) {
- top->l = subheap_pop(top->l);
- --top->nl;
- return 0;
- }
- else if (heap_remove_one(heap, top->l, data) == 0) {
- --top->nl;
- return 0;
- }
- }
- if (top->r) {
- if (top->r->data == data) {
- top->r = subheap_pop(top->r);
- --top->nr;
- return 0;
- }
- else if (heap_remove_one(heap, top->r, data) == 0) {
- --top->nr;
- return 0;
- }
- }
- return -1;
-}
-
-int
-heap_remove(heap_t *heap, void *data)
-{
- return heap_remove_one(heap, heap->top, data);
-}
-
-
-size_t
-heap_size(heap_t *heap)
-{
- if (heap->top == NULL)
- return 0;
- return heap->top->nl + heap->top->nr + 1;
-}
-
-int
-heap_destroy(heap_t *heap)
-{
- void *data;
- int32 val;
-
- /* Empty the heap and free it */
- while (heap_pop(heap, &data, &val) > 0)
- ;
- ckd_free(heap);
-
- return 0;
-}
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