mirror of
https://github.com/OpenTTD/OpenTTD.git
synced 2024-08-29 21:46:03 +02:00
720 lines
17 KiB
C
720 lines
17 KiB
C
#include "stdafx.h"
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#include "openttd.h"
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#include "queue.h"
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static void Stack_Clear(Queue* q, bool free_values)
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{
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uint i;
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if (free_values)
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for (i=0;i<q->data.stack.size;i++)
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free(q->data.stack.elements[i]);
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q->data.stack.size = 0;
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}
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static void Stack_Free(Queue* q, bool free_values)
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{
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q->clear(q, free_values);
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free(q->data.stack.elements);
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if (q->freeq)
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free(q);
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}
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static bool Stack_Push(Queue* q, void* item, int priority)
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{
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if (q->data.stack.size == q->data.stack.max_size)
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return false;
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q->data.stack.elements[q->data.stack.size++] = item;
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return true;
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}
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static void* Stack_Pop(Queue* q)
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{
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void* result;
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if (q->data.stack.size == 0)
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return NULL;
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result = q->data.stack.elements[--q->data.stack.size];
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return result;
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}
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static bool Stack_Delete(Queue* q, void* item, int priority)
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{
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return false;
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}
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static Queue* init_stack(Queue* q, uint max_size)
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{
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q->push = Stack_Push;
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q->pop = Stack_Pop;
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q->del = Stack_Delete;
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q->clear = Stack_Clear;
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q->free = Stack_Free;
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q->data.stack.max_size = max_size;
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q->data.stack.size = 0;
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q->data.stack.elements = malloc(max_size * sizeof(void*));
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q->freeq = false;
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return q;
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}
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Queue* new_Stack(uint max_size)
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{
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Queue* q = malloc(sizeof(Queue));
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init_stack(q, max_size);
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q->freeq = true;
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return q;
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}
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/*
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* Fifo
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*/
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static void Fifo_Clear(Queue* q, bool free_values)
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{
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uint head, tail;
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if (free_values) {
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head = q->data.fifo.head;
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tail = q->data.fifo.tail; /* cache for speed */
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while (head != tail) {
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free(q->data.fifo.elements[tail]);
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tail = (tail + 1) % q->data.fifo.max_size;
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}
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}
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q->data.fifo.head = q->data.fifo.tail = 0;
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}
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static void Fifo_Free(Queue* q, bool free_values)
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{
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q->clear(q, free_values);
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free(q->data.fifo.elements);
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if (q->freeq)
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free(q);
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}
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static bool Fifo_Push(Queue* q, void* item, int priority)
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{
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uint next = (q->data.fifo.head + 1) % q->data.fifo.max_size;
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if (next == q->data.fifo.tail)
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return false;
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q->data.fifo.elements[q->data.fifo.head] = item;
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q->data.fifo.head = next;
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return true;
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}
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static void* Fifo_Pop(Queue* q)
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{
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void* result;
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if (q->data.fifo.head == q->data.fifo.tail)
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return NULL;
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result = q->data.fifo.elements[q->data.fifo.tail];
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q->data.fifo.tail = (q->data.fifo.tail + 1) % q->data.fifo.max_size;
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return result;
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}
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static bool Fifo_Delete(Queue* q, void* item, int priority)
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{
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return false;
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}
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static Queue* init_fifo(Queue* q, uint max_size)
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{
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q->push = Fifo_Push;
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q->pop = Fifo_Pop;
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q->del = Fifo_Delete;
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q->clear = Fifo_Clear;
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q->free = Fifo_Free;
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q->data.fifo.max_size = max_size;
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q->data.fifo.head = 0;
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q->data.fifo.tail = 0;
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q->data.fifo.elements = malloc(max_size * sizeof(void*));
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q->freeq = false;
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return q;
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}
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Queue* new_Fifo(uint max_size)
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{
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Queue* q = malloc(sizeof(Queue));
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init_fifo(q, max_size);
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q->freeq = true;
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return q;
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}
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/*
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* Insertion Sorter
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*/
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static void InsSort_Clear(Queue* q, bool free_values)
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{
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InsSortNode* node = q->data.inssort.first;
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InsSortNode* prev;
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while (node != NULL) {
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if (free_values)
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free(node->item);
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prev = node;
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node = node->next;
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free(prev);
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}
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q->data.inssort.first = NULL;
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}
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static void InsSort_Free(Queue* q, bool free_values)
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{
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q->clear(q, free_values);
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if (q->freeq)
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free(q);
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}
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static bool InsSort_Push(Queue* q, void* item, int priority)
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{
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InsSortNode* newnode = malloc(sizeof(InsSortNode));
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if (newnode == NULL) return false;
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newnode->item = item;
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newnode->priority = priority;
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if (q->data.inssort.first == NULL || q->data.inssort.first->priority >= priority) {
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newnode->next = q->data.inssort.first;
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q->data.inssort.first = newnode;
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} else {
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InsSortNode* node = q->data.inssort.first;
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while( node != NULL ) {
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if (node->next == NULL || node->next->priority >= priority) {
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newnode->next = node->next;
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node->next = newnode;
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break;
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}
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node = node->next;
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}
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}
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return true;
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}
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static void* InsSort_Pop(Queue* q)
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{
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InsSortNode* node = q->data.inssort.first;
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void* result;
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if (node == NULL)
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return NULL;
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result = node->item;
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q->data.inssort.first = q->data.inssort.first->next;
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if (q->data.inssort.first)
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assert(q->data.inssort.first->priority >= node->priority);
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free(node);
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return result;
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}
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static bool InsSort_Delete(Queue* q, void* item, int priority)
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{
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return false;
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}
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void init_InsSort(Queue* q) {
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q->push = InsSort_Push;
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q->pop = InsSort_Pop;
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q->del = InsSort_Delete;
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q->clear = InsSort_Clear;
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q->free = InsSort_Free;
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q->data.inssort.first = NULL;
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q->freeq = false;
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}
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Queue* new_InsSort(void)
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{
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Queue* q = malloc(sizeof(Queue));
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init_InsSort(q);
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q->freeq = true;
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return q;
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}
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/*
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* Binary Heap
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* For information, see: http://www.policyalmanac.org/games/binaryHeaps.htm
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*/
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#define BINARY_HEAP_BLOCKSIZE (1 << BINARY_HEAP_BLOCKSIZE_BITS)
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#define BINARY_HEAP_BLOCKSIZE_MASK (BINARY_HEAP_BLOCKSIZE-1)
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// To make our life easy, we make the next define
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// Because Binary Heaps works with array from 1 to n,
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// and C with array from 0 to n-1, and we don't like typing
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// q->data.binaryheap.elements[i-1] every time, we use this define.
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#define BIN_HEAP_ARR(i) q->data.binaryheap.elements[((i)-1) >> BINARY_HEAP_BLOCKSIZE_BITS][((i)-1) & BINARY_HEAP_BLOCKSIZE_MASK]
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static void BinaryHeap_Clear(Queue* q, bool free_values)
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{
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/* Free all items if needed and free all but the first blocks of
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* memory */
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uint i,j;
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for (i=0;i<q->data.binaryheap.blocks;i++) {
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if (q->data.binaryheap.elements[i] == NULL) {
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/* No more allocated blocks */
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break;
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}
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/* For every allocated block */
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if (free_values)
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for (j=0;j<(1<<BINARY_HEAP_BLOCKSIZE_BITS);j++) {
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/* For every element in the block */
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if ((q->data.binaryheap.size >> BINARY_HEAP_BLOCKSIZE_BITS) == i
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&& (q->data.binaryheap.size & BINARY_HEAP_BLOCKSIZE_MASK) == j)
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break; /* We're past the last element */
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free(q->data.binaryheap.elements[i][j].item);
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}
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if (i != 0) {
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/* Leave the first block of memory alone */
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free(q->data.binaryheap.elements[i]);
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q->data.binaryheap.elements[i] = NULL;
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}
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}
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q->data.binaryheap.size = 0;
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q->data.binaryheap.blocks = 1;
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}
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static void BinaryHeap_Free(Queue* q, bool free_values)
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{
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uint i;
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q->clear(q, free_values);
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for (i=0;i<q->data.binaryheap.blocks;i++) {
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if (q->data.binaryheap.elements[i] == NULL)
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break;
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free(q->data.binaryheap.elements[i]);
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}
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if (q->freeq)
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free(q);
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}
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static bool BinaryHeap_Push(Queue* q, void* item, int priority)
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{
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#ifdef QUEUE_DEBUG
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printf("[BinaryHeap] Pushing an element. There are %d elements left\n", q->data.binaryheap.size);
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#endif
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if (q->data.binaryheap.size == q->data.binaryheap.max_size)
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return false;
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assert(q->data.binaryheap.size < q->data.binaryheap.max_size);
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if (q->data.binaryheap.elements[q->data.binaryheap.size >> BINARY_HEAP_BLOCKSIZE_BITS] == NULL) {
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/* The currently allocated blocks are full, allocate a new one */
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assert((q->data.binaryheap.size & BINARY_HEAP_BLOCKSIZE_MASK) == 0);
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q->data.binaryheap.elements[q->data.binaryheap.size >> BINARY_HEAP_BLOCKSIZE_BITS] = malloc(BINARY_HEAP_BLOCKSIZE * sizeof(BinaryHeapNode));
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q->data.binaryheap.blocks++;
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#ifdef QUEUE_DEBUG
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printf("[BinaryHeap] Increasing size of elements to %d nodes\n",q->data.binaryheap.blocks * BINARY_HEAP_BLOCKSIZE);
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#endif
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}
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// Add the item at the end of the array
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BIN_HEAP_ARR(q->data.binaryheap.size+1).priority = priority;
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BIN_HEAP_ARR(q->data.binaryheap.size+1).item = item;
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q->data.binaryheap.size++;
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// Now we are going to check where it belongs. As long as the parent is
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// bigger, we switch with the parent
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{
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int i, j;
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BinaryHeapNode temp;
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i = q->data.binaryheap.size;
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while (i > 1) {
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// Get the parent of this object (divide by 2)
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j = i / 2;
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// Is the parent bigger then the current, switch them
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if (BIN_HEAP_ARR(i).priority <= BIN_HEAP_ARR(j).priority) {
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temp = BIN_HEAP_ARR(j);
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BIN_HEAP_ARR(j) = BIN_HEAP_ARR(i);
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BIN_HEAP_ARR(i) = temp;
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i = j;
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} else {
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// It is not, we're done!
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break;
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}
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}
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}
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return true;
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}
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static bool BinaryHeap_Delete(Queue* q, void* item, int priority)
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{
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#ifdef QUEUE_DEBUG
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printf("[BinaryHeap] Deleting an element. There are %d elements left\n", q->data.binaryheap.size);
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#endif
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uint i = 0;
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// First, we try to find the item..
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do {
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if (BIN_HEAP_ARR(i+1).item == item) break;
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i++;
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} while (i < q->data.binaryheap.size);
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// We did not find the item, so we return false
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if (i == q->data.binaryheap.size) return false;
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// Now we put the last item over the current item while decreasing the size of the elements
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q->data.binaryheap.size--;
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BIN_HEAP_ARR(i+1) = BIN_HEAP_ARR(q->data.binaryheap.size+1);
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// Now the only thing we have to do, is resort it..
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// On place i there is the item to be sorted.. let's start there
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{
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uint j;
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BinaryHeapNode temp;
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// Because of the fast that Binary Heap uses array from 1 to n, we need to increase
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// i with 1
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i++;
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for (;;) {
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j = i;
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// Check if we have 2 childs
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if (2*j+1 <= q->data.binaryheap.size) {
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// Is this child smaller than the parent?
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if (BIN_HEAP_ARR(j).priority >= BIN_HEAP_ARR(2*j).priority) {i = 2*j; }
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// Yes, we _need_ to use i here, not j, because we want to have the smallest child
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// This way we get that straight away!
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if (BIN_HEAP_ARR(i).priority >= BIN_HEAP_ARR(2*j+1).priority) { i = 2*j+1; }
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// Do we have one child?
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} else if (2*j <= q->data.binaryheap.size) {
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if (BIN_HEAP_ARR(j).priority >= BIN_HEAP_ARR(2*j).priority) { i = 2*j; }
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}
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// One of our childs is smaller than we are, switch
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if (i != j) {
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temp = BIN_HEAP_ARR(j);
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BIN_HEAP_ARR(j) = BIN_HEAP_ARR(i);
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BIN_HEAP_ARR(i) = temp;
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} else {
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// None of our childs is smaller, so we stay here.. stop :)
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break;
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}
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}
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}
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return true;
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}
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static void* BinaryHeap_Pop(Queue* q)
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{
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#ifdef QUEUE_DEBUG
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printf("[BinaryHeap] Popping an element. There are %d elements left\n", q->data.binaryheap.size);
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#endif
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void* result;
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if (q->data.binaryheap.size == 0)
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return NULL;
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// The best item is always on top, so give that as result
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result = BIN_HEAP_ARR(1).item;
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// And now we should get ride of this item...
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BinaryHeap_Delete(q,BIN_HEAP_ARR(1).item, BIN_HEAP_ARR(1).priority);
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return result;
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}
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void init_BinaryHeap(Queue* q, uint max_size)
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{
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assert(q);
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q->push = BinaryHeap_Push;
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q->pop = BinaryHeap_Pop;
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q->del = BinaryHeap_Delete;
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q->clear = BinaryHeap_Clear;
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q->free = BinaryHeap_Free;
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q->data.binaryheap.max_size = max_size;
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q->data.binaryheap.size = 0;
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// We malloc memory in block of BINARY_HEAP_BLOCKSIZE
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// It autosizes when it runs out of memory
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q->data.binaryheap.elements = calloc(1, ((max_size - 1) / BINARY_HEAP_BLOCKSIZE*sizeof(BinaryHeapNode)) + 1);
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q->data.binaryheap.elements[0] = malloc(BINARY_HEAP_BLOCKSIZE * sizeof(BinaryHeapNode));
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q->data.binaryheap.blocks = 1;
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q->freeq = false;
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#ifdef QUEUE_DEBUG
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printf("[BinaryHeap] Initial size of elements is %d nodes\n",(1024));
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#endif
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}
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Queue* new_BinaryHeap(uint max_size) {
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Queue* q = malloc(sizeof(Queue));
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init_BinaryHeap(q, max_size);
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q->freeq = true;
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return q;
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}
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// Because we don't want anyone else to bother with our defines
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#undef BIN_HEAP_ARR
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/*
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* Hash
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*/
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void init_Hash(Hash* h, Hash_HashProc* hash, uint num_buckets) {
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/* Allocate space for the Hash, the buckets and the bucket flags */
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uint i;
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assert(h);
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#ifdef HASH_DEBUG
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debug("Allocated hash: %p", h);
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#endif
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h->hash = hash;
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h->size = 0;
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h->num_buckets = num_buckets;
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h->buckets = malloc(num_buckets * (sizeof(HashNode) + sizeof(bool)));
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#ifdef HASH_DEBUG
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debug("Buckets = %p", h->buckets);
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#endif
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h->buckets_in_use = (bool*)(h->buckets + num_buckets);
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h->freeh = false;
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for (i=0;i<num_buckets;i++)
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h->buckets_in_use[i] = false;
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}
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Hash* new_Hash(Hash_HashProc* hash, int num_buckets) {
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Hash* h = malloc(sizeof(Hash));
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init_Hash(h, hash, num_buckets);
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h->freeh = true;
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return h;
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}
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void delete_Hash(Hash* h, bool free_values) {
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uint i;
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/* Iterate all buckets */
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for (i=0;i<h->num_buckets;i++)
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{
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if (h->buckets_in_use[i]) {
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HashNode* node;
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/* Free the first value */
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if (free_values)
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free(h->buckets[i].value);
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node = h->buckets[i].next;
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while (node != NULL) {
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HashNode* prev = node;
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node = node->next;
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/* Free the value */
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if (free_values)
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free(prev->value);
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/* Free the node */
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free(prev);
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}
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}
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}
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free(h->buckets);
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/* No need to free buckets_in_use, it is always allocated in one
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* malloc with buckets */
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#ifdef HASH_DEBUG
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debug("Freeing Hash: %p", h);
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#endif
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if (h->freeh)
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free(h);
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}
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void stat_Hash(Hash* h)
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{
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uint used_buckets = 0;
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uint max_collision = 0;
|
|
uint max_usage = 0;
|
|
uint usage[200];
|
|
uint i;
|
|
uint collision;
|
|
HashNode* node;
|
|
|
|
for (i=0;i<200;i++) usage[i] = 0;
|
|
for (i=0;i<h->num_buckets;i++) {
|
|
collision = 0;
|
|
if (h->buckets_in_use[i]) {
|
|
used_buckets++;
|
|
node = &h->buckets[i];
|
|
while (node != NULL) {
|
|
collision++;
|
|
node = node->next;
|
|
}
|
|
if (collision > max_collision) max_collision = collision;
|
|
}
|
|
if (collision > 199) collision = 199;
|
|
usage[collision]++;
|
|
if (collision >0 && usage[collision] >= max_usage) max_usage = usage[collision];
|
|
}
|
|
printf("---\nHash size: %d\nNodes used: %d\nNon empty buckets: %d\nMax collision: %d\n", h->num_buckets, h->size, used_buckets, max_collision);
|
|
printf("{ ");
|
|
for (i=0;i<=max_collision;i++)
|
|
if (usage[i]) {
|
|
printf("%d:%d ", i, usage[i]);
|
|
/*
|
|
if (i>0){
|
|
uint j;
|
|
for (j=0;j<(usage[i] * 160 / 800);j++)
|
|
printf("#");
|
|
}
|
|
printf("\n");
|
|
*/
|
|
}
|
|
printf ("}\n");
|
|
}
|
|
|
|
void clear_Hash(Hash* h, bool free_values)
|
|
{
|
|
uint i;
|
|
HashNode* node;
|
|
#ifdef HASH_STATS
|
|
if (h->size > 2000)
|
|
stat_Hash(h);
|
|
#endif
|
|
/* Iterate all buckets */
|
|
for (i=0;i<h->num_buckets;i++)
|
|
{
|
|
if (h->buckets_in_use[i]) {
|
|
h->buckets_in_use[i] = false;
|
|
/* Free the first value */
|
|
if (free_values)
|
|
free(h->buckets[i].value);
|
|
node = h->buckets[i].next;
|
|
while (node != NULL) {
|
|
HashNode* prev = node;
|
|
node = node->next;
|
|
if (free_values)
|
|
free(prev->value);
|
|
free(prev);
|
|
}
|
|
}
|
|
}
|
|
h->size = 0;
|
|
}
|
|
|
|
/* Finds the node that that saves this key pair. If it is not
|
|
* found, returns NULL. If it is found, *prev is set to the
|
|
* node before the one found, or if the node found was the first in the bucket
|
|
* to NULL. If it is not found, *prev is set to the last HashNode in the
|
|
* bucket, or NULL if it is empty. prev can also be NULL, in which case it is
|
|
* not used for output.
|
|
*/
|
|
static HashNode* Hash_FindNode(Hash* h, uint key1, uint key2, HashNode** prev_out)
|
|
{
|
|
uint hash = h->hash(key1, key2);
|
|
HashNode* result = NULL;
|
|
#ifdef HASH_DEBUG
|
|
debug("Looking for %u, %u", key1, key2);
|
|
#endif
|
|
/* Check if the bucket is empty */
|
|
if (!h->buckets_in_use[hash]) {
|
|
if (prev_out)
|
|
*prev_out = NULL;
|
|
result = NULL;
|
|
/* Check the first node specially */
|
|
} else if (h->buckets[hash].key1 == key1 && h->buckets[hash].key2 == key2) {
|
|
/* Save the value */
|
|
result = h->buckets + hash;
|
|
if (prev_out)
|
|
*prev_out = NULL;
|
|
#ifdef HASH_DEBUG
|
|
debug("Found in first node: %p", result);
|
|
#endif
|
|
/* Check all other nodes */
|
|
} else {
|
|
HashNode* prev = h->buckets + hash;
|
|
HashNode* node = prev->next;
|
|
while (node != NULL) {
|
|
if (node->key1 == key1 && node->key2 == key2) {
|
|
/* Found it */
|
|
result = node;
|
|
#ifdef HASH_DEBUG
|
|
debug("Found in other node: %p", result);
|
|
#endif
|
|
break;
|
|
}
|
|
prev = node;
|
|
node = node->next;
|
|
}
|
|
if (prev_out)
|
|
*prev_out = prev;
|
|
}
|
|
#ifdef HASH_DEBUG
|
|
if (result == NULL)
|
|
debug("Not found");
|
|
#endif
|
|
return result;
|
|
}
|
|
|
|
void* Hash_Delete(Hash* h, uint key1, uint key2) {
|
|
void* result;
|
|
HashNode* prev; /* Used as output var for below function call */
|
|
HashNode* node = Hash_FindNode(h, key1, key2, &prev);
|
|
|
|
if (node == NULL) {
|
|
/* not found */
|
|
result = NULL;
|
|
} else if (prev == NULL) {
|
|
/* It is in the first node, we can't free that one, so we free
|
|
* the next one instead (if there is any)*/
|
|
/* Save the value */
|
|
result = node->value;
|
|
if (node->next != NULL) {
|
|
HashNode* next = node->next;
|
|
/* Copy the second to the first */
|
|
*node = *next;
|
|
/* Free the second */
|
|
#ifndef NOFREE
|
|
free(next);
|
|
#endif
|
|
} else {
|
|
/* This was the last in this bucket */
|
|
/* Mark it as empty */
|
|
uint hash = h->hash(key1, key2);
|
|
h->buckets_in_use[hash] = false;
|
|
}
|
|
} else {
|
|
/* It is in another node */
|
|
/* Save the value */
|
|
result = node->value;
|
|
/* Link previous and next nodes */
|
|
prev->next = node->next;
|
|
/* Free the node */
|
|
#ifndef NOFREE
|
|
free(node);
|
|
#endif
|
|
}
|
|
if (result != NULL)
|
|
h->size--;
|
|
return result;
|
|
}
|
|
|
|
|
|
void* Hash_Set(Hash* h, uint key1, uint key2, void* value) {
|
|
HashNode* prev;
|
|
HashNode* node = Hash_FindNode(h, key1, key2, &prev);
|
|
void* result = NULL;
|
|
if (node != NULL) {
|
|
/* Found it */
|
|
result = node->value;
|
|
node->value = value;
|
|
return result;
|
|
}
|
|
/* It is not yet present, let's add it */
|
|
if (prev == NULL) {
|
|
/* The bucket is still empty */
|
|
uint hash = h->hash(key1, key2);
|
|
h->buckets_in_use[hash] = true;
|
|
node = h->buckets + hash;
|
|
} else {
|
|
/* Add it after prev */
|
|
node = malloc(sizeof(HashNode));
|
|
prev->next = node;
|
|
}
|
|
node->next = NULL;
|
|
node->key1 = key1;
|
|
node->key2 = key2;
|
|
node->value = value;
|
|
h->size++;
|
|
return NULL;
|
|
}
|
|
|
|
void* Hash_Get(Hash* h, uint key1, uint key2) {
|
|
HashNode* node = Hash_FindNode(h, key1, key2, NULL);
|
|
#ifdef HASH_DEBUG
|
|
debug("Found node: %p", node);
|
|
#endif
|
|
if (node == NULL) {
|
|
/* Node not found */
|
|
return NULL;
|
|
} else {
|
|
return node->value;
|
|
}
|
|
}
|
|
|
|
uint Hash_Size(Hash* h) {
|
|
return h->size;
|
|
}
|