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/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "nghttp2_pq.h"
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#include <stdio.h>
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#include <assert.h>
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#include "nghttp2_helper.h"
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void nghttp2_pq_init(nghttp2_pq *pq, nghttp2_less less, nghttp2_mem *mem) {
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pq->mem = mem;
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pq->capacity = 0;
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pq->q = NULL;
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pq->length = 0;
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pq->less = less;
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}
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void nghttp2_pq_free(nghttp2_pq *pq) {
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nghttp2_mem_free(pq->mem, pq->q);
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pq->q = NULL;
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}
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static void swap(nghttp2_pq *pq, size_t i, size_t j) {
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nghttp2_pq_entry *a = pq->q[i];
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nghttp2_pq_entry *b = pq->q[j];
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pq->q[i] = b;
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b->index = i;
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pq->q[j] = a;
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a->index = j;
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}
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static void bubble_up(nghttp2_pq *pq, size_t index) {
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size_t parent;
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while (index != 0) {
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parent = (index - 1) / 2;
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if (!pq->less(pq->q[index], pq->q[parent])) {
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return;
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}
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swap(pq, parent, index);
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index = parent;
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}
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}
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int nghttp2_pq_push(nghttp2_pq *pq, nghttp2_pq_entry *item) {
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if (pq->capacity <= pq->length) {
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void *nq;
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size_t ncapacity;
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ncapacity = nghttp2_max(4, (pq->capacity * 2));
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nq = nghttp2_mem_realloc(pq->mem, pq->q,
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ncapacity * sizeof(nghttp2_pq_entry *));
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if (nq == NULL) {
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return NGHTTP2_ERR_NOMEM;
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}
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pq->capacity = ncapacity;
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pq->q = nq;
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}
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pq->q[pq->length] = item;
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item->index = pq->length;
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++pq->length;
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bubble_up(pq, pq->length - 1);
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return 0;
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}
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nghttp2_pq_entry *nghttp2_pq_top(nghttp2_pq *pq) {
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if (pq->length == 0) {
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return NULL;
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} else {
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return pq->q[0];
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}
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}
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static void bubble_down(nghttp2_pq *pq, size_t index) {
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size_t i, j, minindex;
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for (;;) {
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j = index * 2 + 1;
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minindex = index;
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for (i = 0; i < 2; ++i, ++j) {
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if (j >= pq->length) {
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break;
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}
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if (pq->less(pq->q[j], pq->q[minindex])) {
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minindex = j;
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}
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}
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if (minindex == index) {
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return;
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}
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swap(pq, index, minindex);
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index = minindex;
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}
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}
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void nghttp2_pq_pop(nghttp2_pq *pq) {
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if (pq->length > 0) {
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pq->q[0] = pq->q[pq->length - 1];
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pq->q[0]->index = 0;
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--pq->length;
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bubble_down(pq, 0);
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}
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}
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void nghttp2_pq_remove(nghttp2_pq *pq, nghttp2_pq_entry *item) {
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assert(pq->q[item->index] == item);
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if (item->index == 0) {
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nghttp2_pq_pop(pq);
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return;
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}
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if (item->index == pq->length - 1) {
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--pq->length;
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return;
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}
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pq->q[item->index] = pq->q[pq->length - 1];
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pq->q[item->index]->index = item->index;
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--pq->length;
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if (pq->less(item, pq->q[item->index])) {
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bubble_down(pq, item->index);
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} else {
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bubble_up(pq, item->index);
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}
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}
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int nghttp2_pq_empty(nghttp2_pq *pq) { return pq->length == 0; }
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size_t nghttp2_pq_size(nghttp2_pq *pq) { return pq->length; }
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void nghttp2_pq_update(nghttp2_pq *pq, nghttp2_pq_item_cb fun, void *arg) {
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size_t i;
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int rv = 0;
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if (pq->length == 0) {
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return;
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}
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for (i = 0; i < pq->length; ++i) {
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rv |= (*fun)(pq->q[i], arg);
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}
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if (rv) {
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for (i = pq->length; i > 0; --i) {
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bubble_down(pq, i - 1);
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}
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}
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}
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int nghttp2_pq_each(nghttp2_pq *pq, nghttp2_pq_item_cb fun, void *arg) {
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size_t i;
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if (pq->length == 0) {
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return 0;
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}
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for (i = 0; i < pq->length; ++i) {
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if ((*fun)(pq->q[i], arg)) {
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return 1;
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}
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}
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return 0;
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}
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