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pqueue.c
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158 lines (123 loc) · 2.96 KB
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/*
* Copyright 2005-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "ssl_locl.h"
#include <openssl/bn.h>
struct pqueue_st {
pitem *items;
int count;
};
pitem *pitem_new(unsigned char *prio64be, void *data)
{
pitem *item = OPENSSL_malloc(sizeof(*item));
if (item == NULL) {
SSLerr(SSL_F_PITEM_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
memcpy(item->priority, prio64be, sizeof(item->priority));
item->data = data;
item->next = NULL;
return item;
}
void pitem_free(pitem *item)
{
OPENSSL_free(item);
}
pqueue *pqueue_new(void)
{
pqueue *pq = OPENSSL_zalloc(sizeof(*pq));
if (pq == NULL)
SSLerr(SSL_F_PQUEUE_NEW, ERR_R_MALLOC_FAILURE);
return pq;
}
void pqueue_free(pqueue *pq)
{
OPENSSL_free(pq);
}
pitem *pqueue_insert(pqueue *pq, pitem *item)
{
pitem *curr, *next;
if (pq->items == NULL) {
pq->items = item;
return item;
}
for (curr = NULL, next = pq->items;
next != NULL; curr = next, next = next->next) {
/*
* we can compare 64-bit value in big-endian encoding with memcmp:-)
*/
int cmp = memcmp(next->priority, item->priority, 8);
if (cmp > 0) { /* next > item */
item->next = next;
if (curr == NULL)
pq->items = item;
else
curr->next = item;
return item;
}
else if (cmp == 0) /* duplicates not allowed */
return NULL;
}
item->next = NULL;
curr->next = item;
return item;
}
pitem *pqueue_peek(pqueue *pq)
{
return pq->items;
}
pitem *pqueue_pop(pqueue *pq)
{
pitem *item = pq->items;
if (pq->items != NULL)
pq->items = pq->items->next;
return item;
}
pitem *pqueue_find(pqueue *pq, unsigned char *prio64be)
{
pitem *next;
pitem *found = NULL;
if (pq->items == NULL)
return NULL;
for (next = pq->items; next->next != NULL; next = next->next) {
if (memcmp(next->priority, prio64be, 8) == 0) {
found = next;
break;
}
}
/* check the one last node */
if (memcmp(next->priority, prio64be, 8) == 0)
found = next;
if (!found)
return NULL;
return found;
}
pitem *pqueue_iterator(pqueue *pq)
{
return pqueue_peek(pq);
}
pitem *pqueue_next(piterator *item)
{
pitem *ret;
if (item == NULL || *item == NULL)
return NULL;
/* *item != NULL */
ret = *item;
*item = (*item)->next;
return ret;
}
size_t pqueue_size(pqueue *pq)
{
pitem *item = pq->items;
size_t count = 0;
while (item != NULL) {
count++;
item = item->next;
}
return count;
}