early-access version 1255

externals/libressl/ssl/pqueue.c

@@ -0,0 +1,201 @@
+/* $OpenBSD: pqueue.c,v 1.5 2014/06/12 15:49:31 deraadt Exp $ */
+/*
+ * 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 <stdlib.h>
+#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 = 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)
+{
+	free(item);
+}
+
+pqueue_s *
+pqueue_new(void)
+{
+	return calloc(1, sizeof(pqueue_s));
+}
+
+void
+pqueue_free(pqueue_s *pq)
+{
+	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;
+
+	for (next = pq->items; next != NULL; next = next->next)
+		if (memcmp(next->priority, prio64be,
+		    sizeof(next->priority)) == 0)
+			return next;
+
+	return NULL;
+}
+
+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;
+}