diff options
Diffstat (limited to 'lib/libssl/pqueue.c')
| -rw-r--r-- | lib/libssl/pqueue.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/lib/libssl/pqueue.c b/lib/libssl/pqueue.c new file mode 100644 index 00000000000..99c118c3b6f --- /dev/null +++ b/lib/libssl/pqueue.c @@ -0,0 +1,222 @@ +/* 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 <string.h> +#include "pqueue.h" + +typedef struct _pqueue { + pitem *items; + int count; +} pqueue_s; + +pitem * +pitem_new(unsigned char *prio64be, void *data) +{ + pitem *item = (pitem *)malloc(sizeof(pitem)); + + if (item == NULL) + return NULL; + + memcpy(item->priority, prio64be, sizeof(item->priority)); + + item->data = data; + item->next = NULL; + + return item; +} + +void +pitem_free(pitem *item) +{ + if (item == NULL) + return; + + free(item); +} + +pqueue_s * +pqueue_new(void) +{ + pqueue_s *pq = (pqueue_s *)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; + + 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) { + /* we can compare 64-bit value in big-endian encoding + * with memcmp:-) */ + int cmp = memcmp(next->priority, item->priority, + sizeof(item->priority)); + 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_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, unsigned char *prio64be) +{ + pitem *next; + pitem *found = NULL; + + if (pq->items == NULL) + return NULL; + + for (next = pq->items; next != NULL; next = next->next) { + if (memcmp(next->priority, prio64be, + sizeof(next->priority)) == 0) { + found = next; + break; + } + } + + if (!found) + return NULL; + + return found; +} + +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; +} + +int +pqueue_size(pqueue_s *pq) +{ + pitem *item = pq->items; + int count = 0; + + while (item != NULL) { + count++; + item = item->next; + } + return count; +} |