129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
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* nghttp2 - HTTP/2.0 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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int nghttp2_pq_init(nghttp2_pq *pq, nghttp2_compar compar)
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{
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pq->capacity = 4096;
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pq->q = malloc(pq->capacity * sizeof(void*));
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if(pq->q == NULL) {
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return NGHTTP2_ERR_NOMEM;
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}
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pq->length = 0;
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pq->compar = compar;
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return 0;
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}
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void nghttp2_pq_free(nghttp2_pq *pq)
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{
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free(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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{
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void *t = pq->q[i];
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pq->q[i] = pq->q[j];
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pq->q[j] = t;
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}
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static void bubble_up(nghttp2_pq *pq, size_t index)
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{
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if(index == 0) {
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return;
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} else {
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size_t parent = (index-1)/2;
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if(pq->compar(pq->q[parent], pq->q[index]) > 0) {
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swap(pq, parent, index);
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bubble_up(pq, parent);
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}
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}
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}
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int nghttp2_pq_push(nghttp2_pq *pq, void *item)
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{
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if(pq->capacity <= pq->length) {
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void *nq;
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nq = realloc(pq->q, (pq->capacity*2) * sizeof(void*));
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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 *= 2;
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pq->q = nq;
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}
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pq->q[pq->length] = item;
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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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void* nghttp2_pq_top(nghttp2_pq *pq)
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{
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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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{
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size_t lchild = index*2+1;
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size_t minindex = index;
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size_t i, j;
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for(i = 0; i < 2; ++i) {
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j = lchild+i;
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if(j >= pq->length) {
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break;
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}
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if(pq->compar(pq->q[minindex], pq->q[j]) > 0) {
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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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swap(pq, index, minindex);
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bubble_down(pq, minindex);
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}
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}
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void nghttp2_pq_pop(nghttp2_pq *pq)
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{
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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->length;
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bubble_down(pq, 0);
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}
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}
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int nghttp2_pq_empty(nghttp2_pq *pq)
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{
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return pq->length == 0;
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}
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size_t nghttp2_pq_size(nghttp2_pq *pq)
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{
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return pq->length;
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}
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