openssl/crypto/pqueue/pqueue.c

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/* crypto/pqueue/pqueue.c */
/*
* DTLS implementation written by Nagendra Modadugu
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include "cryptlib.h"
#include <openssl/bn.h>
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#include "pqueue.h"
typedef struct _pqueue
{
pitem *items;
int count;
} pqueue_s;
pitem *
pitem_new(PQ_64BIT priority, void *data)
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{
pitem *item = (pitem *) OPENSSL_malloc(sizeof(pitem));
if (item == NULL) return NULL;
pq_64bit_init(&(item->priority));
pq_64bit_assign(&item->priority, &priority);
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item->data = data;
item->next = NULL;
return item;
}
void
pitem_free(pitem *item)
{
if (item == NULL) return;
pq_64bit_free(&(item->priority));
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OPENSSL_free(item);
}
pqueue_s *
pqueue_new()
{
pqueue_s *pq = (pqueue_s *) OPENSSL_malloc(sizeof(pqueue_s));
if (pq == NULL) return NULL;
memset(pq, 0x00, sizeof(pqueue_s));
return pq;
}
void
pqueue_free(pqueue_s *pq)
{
if (pq == NULL) return;
OPENSSL_free(pq);
}
pitem *
pqueue_insert(pqueue_s *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)
{
if (pq_64bit_gt(&(next->priority), &(item->priority)))
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{
item->next = next;
if (curr == NULL)
pq->items = item;
else
curr->next = item;
return item;
}
/* duplicates not allowed */
if (pq_64bit_eq(&(item->priority), &(next->priority)))
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return NULL;
}
item->next = NULL;
curr->next = item;
return item;
}
pitem *
pqueue_peek(pqueue_s *pq)
{
return pq->items;
}
pitem *
pqueue_pop(pqueue_s *pq)
{
pitem *item = pq->items;
if (pq->items != NULL)
pq->items = pq->items->next;
return item;
}
pitem *
pqueue_find(pqueue_s *pq, PQ_64BIT priority)
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{
pitem *next;
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pitem *found = NULL;
if ( pq->items == NULL)
return NULL;
for ( next = pq->items; next->next != NULL; next = next->next)
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{
if ( pq_64bit_eq(&(next->priority), &priority))
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{
found = next;
break;
}
}
/* check the one last node */
if ( pq_64bit_eq(&(next->priority), &priority))
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found = next;
if ( ! found)
return NULL;
return found;
}
#if PQ_64BIT_IS_INTEGER
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void
pqueue_print(pqueue_s *pq)
{
pitem *item = pq->items;
while(item != NULL)
{
printf("item\t" PQ_64BIT_PRINT "\n", item->priority);
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item = item->next;
}
}
#endif
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pitem *
pqueue_iterator(pqueue_s *pq)
{
return pqueue_peek(pq);
}
pitem *
pqueue_next(pitem **item)
{
pitem *ret;
if ( item == NULL || *item == NULL)
return NULL;
/* *item != NULL */
ret = *item;
*item = (*item)->next;
return ret;
}
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int
pqueue_size(pqueue_s *pq)
{
pitem *item = pq->items;
int count = 0;
while(item != NULL)
{
count++;
item = item->next;
}
return count;
}