1 files changed, 146 insertions, 0 deletions
diff --git a/src/include/openssl/pqueue.h b/src/include/openssl/pqueue.h
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+/*
+ * 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). */
+
+#ifndef OPENSSL_HEADER_PQUEUE_H
+#define OPENSSL_HEADER_PQUEUE_H
+
+#include <openssl/base.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+/* Priority queue.
+ *
+ * The priority queue maintains a linked-list of nodes, each with a unique,
+ * 64-bit priority, in ascending priority order. */
+
+typedef struct _pqueue *pqueue;
+
+typedef struct _pitem {
+  uint8_t priority[8]; /* 64-bit value in big-endian encoding */
+  void *data;
+  struct _pitem *next;
+} pitem;
+
+typedef struct _pitem *piterator;
+
+
+/* Creating and freeing queues. */
+
+/* pqueue_new allocates a fresh, empty priority queue object and returns it, or
+ * NULL on error. */
+OPENSSL_EXPORT pqueue pqueue_new(void);
+
+/* pqueue_free frees |pq| but not any of the items it points to. Thus |pq| must
+ * be empty or a memory leak will occur. */
+OPENSSL_EXPORT void pqueue_free(pqueue pq);
+
+
+/* Creating and freeing items. */
+
+/* pitem_new allocates a fresh priority queue item that points at |data| and
+ * has a priority given by |prio64be|, which is a 64-bit, unsigned number
+ * expressed in big-endian form. It returns the fresh item, or NULL on
+ * error. */
+OPENSSL_EXPORT pitem *pitem_new(uint8_t prio64be[8], void *data);
+
+/* pitem_free frees |item|, but not any data that it points to. */
+OPENSSL_EXPORT void pitem_free(pitem *item);
+
+
+/* Queue accessor functions */
+
+/* pqueue_peek returns the item with the smallest priority from |pq|, or NULL
+ * if empty. */
+OPENSSL_EXPORT pitem *pqueue_peek(pqueue pq);
+
+/* pqueue_find returns the item whose priority matches |prio64be| or NULL if no
+ * such item exists. */
+OPENSSL_EXPORT pitem *pqueue_find(pqueue pq, uint8_t *prio64be);
+
+
+/* Queue mutation functions */
+
+/* pqueue_insert inserts |item| into |pq| and returns item. */
+OPENSSL_EXPORT pitem *pqueue_insert(pqueue pq, pitem *item);
+
+/* pqueue_pop takes the item with the least priority from |pq| and returns it,
+ * or NULL if |pq| is empty. */
+OPENSSL_EXPORT pitem *pqueue_pop(pqueue pq);
+
+/* pqueue_size returns the number of items in |pq|. */
+OPENSSL_EXPORT size_t pqueue_size(pqueue pq);
+
+
+/* Iterating */
+
+/* pqueue_iterator returns an iterator that can be used to iterate over the
+ * contents of the queue. */
+OPENSSL_EXPORT piterator pqueue_iterator(pqueue pq);
+
+/* pqueue_next returns the current value of |iter| and advances it to the next
+ * position. If the iterator has advanced over all the elements, it returns
+ * NULL. */
+OPENSSL_EXPORT pitem *pqueue_next(piterator *iter);
+
+
+#if defined(__cplusplus)
+}  /* extern C */
+#endif
+
+#endif  /* OPENSSL_HEADER_PQUEUE_H */