mirror of
https://github.com/tesseract-ocr/tesseract.git
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a18816f839
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@441 d0cd1f9f-072b-0410-8dd7-cf729c803f20
327 lines
9.6 KiB
C++
327 lines
9.6 KiB
C++
/******************************************************************************
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** Filename: heap.c
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** Purpose: Routines for managing heaps (smallest at root)
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** Author: Dan Johnson
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** History: 3/13/89, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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******************************************************************************/
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/*-----------------------------------------------------------------------------
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Include Files and Type Defines
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-----------------------------------------------------------------------------*/
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#include "oldheap.h"
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#include "freelist.h"
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#include "danerror.h"
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#include "emalloc.h"
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#include <stdio.h>
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#define FATHER(N) ((N)>>1)
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#define LEFTSON(N) ((N)<<1)
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#define RIGHTSON(N) ((N)<<1 + 1)
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/*-----------------------------------------------------------------------------
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Public Code
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-----------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/**
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* This routine creates and initializes a new heap data
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* structure containing Size elements. In actuality, Size + 1
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* elements are allocated. The first element, element 0, is
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* unused, this makes the index arithmetic easier.
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*
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* Globals:
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* - None
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*
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* @param Size maximum number of entries in the heap
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* @return Pointer to the new heap.
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* @note Exceptions: None
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* @note History: 3/13/89, DSJ, Created.
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*/
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HEAP *MakeHeap(int Size) {
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HEAP *NewHeap;
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NewHeap = (HEAP *) Emalloc (sizeof (HEAP) + Size * sizeof (HEAPENTRY));
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NewHeap->Size = Size;
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NewHeap->FirstFree = 1;
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return (NewHeap);
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} /* MakeHeap */
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/*---------------------------------------------------------------------------*/
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/**
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* This routine removes the top item on the heap and places
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* its contents into Key and Data.
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*
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* Globals:
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* - None
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*
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* @param Heap ptr to heap whose top is to be removed and returned
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* @param Key place to put key of top heap item
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* @param Data place to put data of top heap item
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*
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* @return OK if top entry returned, EMPTY if heap is empty
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* @note Exceptions: None
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* @note History: 5/10/91, DSJ, Created (Modified from GetTopOfHeap).
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*/
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int HeapPop(HEAP *Heap, FLOAT32 *Key, void *out_ptr) {
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inT32 Hole;
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FLOAT32 HoleKey;
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inT32 Son;
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void **Data = (void **) out_ptr;
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if (Heap->FirstFree <= 1)
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return (EMPTY);
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*Key = Heap->Entry[1].Key;
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*Data = Heap->Entry[1].Data;
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Heap->FirstFree--;
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/* imagine the hole at the root is filled with the last entry in the heap */
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HoleKey = Heap->Entry[Heap->FirstFree].Key;
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Hole = 1;
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/* while hole has 2 sons */
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while ((Son = LEFTSON (Hole)) < Heap->FirstFree) {
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/* find the son with the smallest key */
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if (Heap->Entry[Son].Key > Heap->Entry[Son + 1].Key)
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Son++;
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/* if key for hole is greater than key for son, sift hole down */
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if (HoleKey > Heap->Entry[Son].Key) {
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Heap->Entry[Hole].Key = Heap->Entry[Son].Key;
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Heap->Entry[Hole].Data = Heap->Entry[Son].Data;
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Hole = Son;
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}
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else
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break;
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}
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Heap->Entry[Hole].Key = HoleKey;
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Heap->Entry[Hole].Data = Heap->Entry[Heap->FirstFree].Data;
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return (OK);
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} /* HeapPop */
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/**
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* HeapPopWorst
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*
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* Remove the largest item from the heap.
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*
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* @param Heap ptr to heap whose top is to be removed and returned
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* @param Key place to put key of top heap item
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* @param Data place to put data of top heap item
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*/
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int HeapPopWorst(HEAP *Heap, FLOAT32 *Key, void *out_ptr) {
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inT32 Index; /*current index */
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inT32 Hole;
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FLOAT32 HoleKey;
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inT32 Father;
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void *HoleData;
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void **Data = (void **) out_ptr;
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if (Heap->FirstFree <= 1)
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return (EMPTY);
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HoleKey = Heap->Entry[1].Key;
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Hole = 1;
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Heap->FirstFree--;
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for (Index = Heap->FirstFree, Father = FATHER (Index); Index > Father;
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Index--)
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if (Heap->Entry[Index].Key > HoleKey) {
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/*find biggest */
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HoleKey = Heap->Entry[Index].Key;
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Hole = Index;
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}
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*Key = HoleKey;
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*Data = Heap->Entry[Hole].Data;
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HoleKey = Heap->Entry[Heap->FirstFree].Key;
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Heap->Entry[Hole].Key = HoleKey;
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HoleData = Heap->Entry[Heap->FirstFree].Data;
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Heap->Entry[Hole].Data = HoleData;
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/* now sift last entry to its rightful place */
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Father = FATHER (Hole); /*father of hole */
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while (Hole > 1 && Heap->Entry[Father].Key > HoleKey) {
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/*swap entries */
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Heap->Entry[Hole].Key = Heap->Entry[Father].Key;
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Heap->Entry[Hole].Data = Heap->Entry[Father].Data;
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Heap->Entry[Father].Data = HoleData;
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Heap->Entry[Father].Key = HoleKey;
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Hole = Father;
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Father = FATHER (Hole);
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}
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return (OK);
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} /* HeapPop */
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/*---------------------------------------------------------------------------*/
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/**
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* This routine stores Data into Heap and associates it
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* with Key. The heap is
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* maintained in such a way that the item with the lowest key
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* is always at the top of the heap.
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*
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* Globals:
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* - None
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*
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* @param Heap ptr to heap to store new item in
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* @param Key numeric key associated with new item
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* @param Data ptr to data contents of new item
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*
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* @note Exceptions:
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* - HEAPFULL error if heap size is exceeded
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*
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* @note History: 5/10/91, DSJ, Created (Modified version of HeapStore).
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*/
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void HeapPush(HEAP *Heap, FLOAT32 Key, void *Data) {
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inT32 Item;
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inT32 Father;
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if (Heap->FirstFree > Heap->Size)
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DoError (HEAPFULL, "Heap size exceeded");
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Item = Heap->FirstFree;
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Heap->FirstFree++;
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while (Item != 1) {
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Father = FATHER (Item);
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if (Heap->Entry[Father].Key > Key) {
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Heap->Entry[Item].Key = Heap->Entry[Father].Key;
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Heap->Entry[Item].Data = Heap->Entry[Father].Data;
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Item = Father;
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}
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else
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break;
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}
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Heap->Entry[Item].Key = Key;
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Heap->Entry[Item].Data = Data;
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} /* HeapPush */
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/*---------------------------------------------------------------------------*/
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/**
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* This routine stores Entry into Heap. The heap is
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* maintained in such a way that the item with the lowest key
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* is always at the top of the heap.
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*
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* Globals:
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* - None
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*
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* @param Heap ptr to heap to store new item in
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* @param Entry ptr to item to be stored in Heap
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* @note Exceptions:
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* - HEAPFULL error if heap size is exceeded
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* @note History: 3/13/89, DSJ, Created.
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*/
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void HeapStore(HEAP *Heap, HEAPENTRY *Entry) {
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inT32 Item;
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inT32 Father;
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if (Heap->FirstFree > Heap->Size)
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DoError (HEAPFULL, "Heap size exceeded");
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Item = Heap->FirstFree;
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Heap->FirstFree++;
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while (Item != 1) {
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Father = FATHER (Item);
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if (Heap->Entry[Father].Key > Entry->Key) {
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Heap->Entry[Item].Key = Heap->Entry[Father].Key;
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Heap->Entry[Item].Data = Heap->Entry[Father].Data;
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Item = Father;
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}
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else
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break;
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}
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Heap->Entry[Item].Key = Entry->Key;
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Heap->Entry[Item].Data = Entry->Data;
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} /* HeapStore */
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/*---------------------------------------------------------------------------*/
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/**
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* This routine removes the top item on the heap and copies its
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* contents into Entry.
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*
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* @param Heap ptr to heap whose top is to be removed and returned
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* @param Entry ptr to heap entry to be filled with top entry on Heap
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*
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* Globals:
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* - None
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*
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* @return OK if top entry returned, EMPTY if heap is empty
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* @note Exceptions: None
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* @note History: 3/13/89, DSJ, Created.
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*/
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int GetTopOfHeap(HEAP *Heap, HEAPENTRY *Entry) {
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inT32 Hole;
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FLOAT32 HoleKey;
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inT32 Son;
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if (Heap->FirstFree <= 1)
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return (EMPTY);
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Entry->Key = Heap->Entry[1].Key;
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Entry->Data = Heap->Entry[1].Data;
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Heap->FirstFree--;
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/* imagine the hole at the root is filled with the last entry in the heap */
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HoleKey = Heap->Entry[Heap->FirstFree].Key;
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Hole = 1;
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/* while hole has 2 sons */
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while ((Son = LEFTSON (Hole)) < Heap->FirstFree) {
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/* find the son with the smallest key */
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if (Heap->Entry[Son].Key > Heap->Entry[Son + 1].Key)
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Son++;
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/* if key for hole is greater than key for son, sift hole down */
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if (HoleKey > Heap->Entry[Son].Key) {
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Heap->Entry[Hole].Key = Heap->Entry[Son].Key;
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Heap->Entry[Hole].Data = Heap->Entry[Son].Data;
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Hole = Son;
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}
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else
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break;
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}
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Heap->Entry[Hole].Key = HoleKey;
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Heap->Entry[Hole].Data = Heap->Entry[Heap->FirstFree].Data;
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return (OK);
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} /* GetTopOfHeap */
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/*---------------------------------------------------------------------------*/
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/**
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* This routine is similar to FreeHeap in that it
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* deallocates the memory consumed by the heap. However, it
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* also calls Deallocator for each item in the heap so that
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* this data is also deallocated.
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*
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* @param Heap heap whose data is to be freed
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* @param Deallocator function to be used to deallocate data
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*
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* Globals:
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* - None
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*
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* @note Exceptions: none
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* @note History: Tue May 15 08:52:04 1990, DSJ, Created.
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*/
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void FreeHeapData(HEAP *Heap, void_dest destructor) {
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HEAPENTRY Entry;
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while (GetTopOfHeap (Heap, &Entry) != EMPTY)
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destructor (Entry.Data);
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FreeHeap(Heap);
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} /* FreeHeapData */
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