/*
This file is part of GNUnet.
- (C) 2008, 2012 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2008, 2012 GNUnet e.V.
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Affero General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/container_multipeermap.c
#include "platform.h"
#include "gnunet_util_lib.h"
-#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+#define LOG(kind,...) GNUNET_log_from (kind, "util-container-multipeermap", __VA_ARGS__)
+
+/**
+ * Maximum recursion depth for callbacks of
+ * #GNUNET_CONTAINER_multihashmap_get_multiple() themselve s
+ * again calling #GNUNET_CONTAINER_multihashmap_get_multiple().
+ * Should be totally excessive, but if violated we die.
+ */
+#define NEXT_CACHE_SIZE 16
/**
* An entry in the hash map with the full key.
unsigned int map_length;
/**
- * GNUNET_NO if the map entries are of type 'struct BigMapEntry',
- * GNUNET_YES if the map entries are of type 'struct SmallMapEntry'.
+ * #GNUNET_NO if the map entries are of type 'struct BigMapEntry',
+ * #GNUNET_YES if the map entries are of type 'struct SmallMapEntry'.
*/
int use_small_entries;
* to the map, so that iterators can check if they are still valid.
*/
unsigned int modification_counter;
+
+ /**
+ * Map entries indicating iteration positions currently
+ * in use by #GNUNET_CONTAINER_multihashmap_get_multiple().
+ * Only used up to @e next_cache_off.
+ */
+ union MapEntry next_cache[NEXT_CACHE_SIZE];
+
+ /**
+ * Offset of @e next_cache entries in use, must be smaller
+ * than #NEXT_CACHE_SIZE.
+ */
+ unsigned int next_cache_off;
};
GNUNET_assert (len > 0);
map = GNUNET_new (struct GNUNET_CONTAINER_MultiPeerMap);
- map->map = GNUNET_malloc (len * sizeof (union MapEntry));
+ map->map = GNUNET_malloc_large (len *
+ sizeof (union MapEntry));
+ if (NULL == map->map)
+ {
+ GNUNET_free (map);
+ return NULL;
+ }
map->map_length = len;
map->use_small_entries = do_not_copy_keys;
return map;
* @param map the map
*/
void
-GNUNET_CONTAINER_multipeermap_destroy (struct GNUNET_CONTAINER_MultiPeerMap
- *map)
+GNUNET_CONTAINER_multipeermap_destroy (struct GNUNET_CONTAINER_MultiPeerMap *map)
{
- unsigned int i;
- union MapEntry me;
-
- for (i = 0; i < map->map_length; i++)
+ GNUNET_assert (0 == map->next_cache_off);
+ for (unsigned int i = 0; i < map->map_length; i++)
{
+ union MapEntry me;
+
me = map->map[i];
if (map->use_small_entries)
{
idx_of (const struct GNUNET_CONTAINER_MultiPeerMap *map,
const struct GNUNET_PeerIdentity *key)
{
- GNUNET_assert (map != NULL);
- return (*(unsigned int *) key) % map->map_length;
+ unsigned int kx;
+
+ GNUNET_assert (NULL != map);
+ GNUNET_memcpy (&kx,
+ key,
+ sizeof (kx));
+ return kx % map->map_length;
}
* @return the number of key value pairs
*/
unsigned int
-GNUNET_CONTAINER_multipeermap_size (const struct GNUNET_CONTAINER_MultiPeerMap
- *map)
+GNUNET_CONTAINER_multipeermap_size (const struct GNUNET_CONTAINER_MultiPeerMap *map)
{
return map->size;
}
* key-value pairs with value NULL
*/
void *
-GNUNET_CONTAINER_multipeermap_get (const struct GNUNET_CONTAINER_MultiPeerMap
- *map, const struct GNUNET_PeerIdentity *key)
+GNUNET_CONTAINER_multipeermap_get (const struct GNUNET_CONTAINER_MultiPeerMap *map,
+ const struct GNUNET_PeerIdentity *key)
{
union MapEntry me;
me = map->map[idx_of (map, key)];
if (map->use_small_entries)
{
- struct SmallMapEntry *sme;
-
- for (sme = me.sme; NULL != sme; sme = sme->next)
- if (0 == memcmp (key, sme->key, sizeof (struct GNUNET_PeerIdentity)))
+ for (struct SmallMapEntry *sme = me.sme; NULL != sme; sme = sme->next)
+ if (0 == memcmp (key,
+ sme->key,
+ sizeof (struct GNUNET_PeerIdentity)))
return sme->value;
}
else
{
- struct BigMapEntry *bme;
-
- for (bme = me.bme; NULL != bme; bme = bme->next)
- if (0 == memcmp (key, &bme->key, sizeof (struct GNUNET_PeerIdentity)))
+ for (struct BigMapEntry *bme = me.bme; NULL != bme; bme = bme->next)
+ if (0 == memcmp (key,
+ &bme->key,
+ sizeof (struct GNUNET_PeerIdentity)))
return bme->value;
}
return NULL;
* #GNUNET_SYSERR if it aborted iteration
*/
int
-GNUNET_CONTAINER_multipeermap_iterate (const struct
- GNUNET_CONTAINER_MultiPeerMap *map,
+GNUNET_CONTAINER_multipeermap_iterate (struct GNUNET_CONTAINER_MultiPeerMap *map,
GNUNET_CONTAINER_PeerMapIterator it,
void *it_cls)
{
int count;
- unsigned int i;
union MapEntry me;
+ union MapEntry *ce;
struct GNUNET_PeerIdentity kc;
count = 0;
GNUNET_assert (NULL != map);
- for (i = 0; i < map->map_length; i++)
+ ce = &map->next_cache[map->next_cache_off];
+ GNUNET_assert (++map->next_cache_off < NEXT_CACHE_SIZE);
+ for (unsigned int i = 0; i < map->map_length; i++)
{
me = map->map[i];
if (map->use_small_entries)
{
struct SmallMapEntry *sme;
- struct SmallMapEntry *nxt;
- nxt = me.sme;
- while (NULL != (sme = nxt))
+ ce->sme = me.sme;
+ while (NULL != (sme = ce->sme))
{
- nxt = sme->next;
+ ce->sme = sme->next;
if (NULL != it)
{
- if (GNUNET_OK != it (it_cls, sme->key, sme->value))
+ if (GNUNET_OK != it (it_cls,
+ sme->key,
+ sme->value))
+ {
+ GNUNET_assert (--map->next_cache_off < NEXT_CACHE_SIZE);
return GNUNET_SYSERR;
+ }
}
count++;
}
else
{
struct BigMapEntry *bme;
- struct BigMapEntry *nxt;
- nxt = me.bme;
- while (NULL != (bme = nxt))
+ ce->bme = me.bme;
+ while (NULL != (bme = ce->bme))
{
- nxt = bme->next;
+ ce->bme = bme->next;
if (NULL != it)
{
kc = bme->key;
- if (GNUNET_OK != it (it_cls, &kc, bme->value))
+ if (GNUNET_OK != it (it_cls,
+ &kc,
+ bme->value))
+ {
+ GNUNET_assert (--map->next_cache_off < NEXT_CACHE_SIZE);
return GNUNET_SYSERR;
+ }
}
count++;
}
}
}
+ GNUNET_assert (--map->next_cache_off < NEXT_CACHE_SIZE);
return count;
}
+/**
+ * We are about to free() the @a bme, make sure it is not in
+ * the list of next values for any iterator in the @a map's next_cache.
+ *
+ * @param map the map to check
+ * @param bme the entry that is about to be free'd
+ */
+static void
+update_next_cache_bme (struct GNUNET_CONTAINER_MultiPeerMap *map,
+ const struct BigMapEntry *bme)
+{
+ for (unsigned int i=0;i<map->next_cache_off;i++)
+ if (map->next_cache[i].bme == bme)
+ map->next_cache[i].bme = bme->next;
+}
+
+
+/**
+ * We are about to free() the @a sme, make sure it is not in
+ * the list of next values for any iterator in the @a map's next_cache.
+ *
+ * @param map the map to check
+ * @param sme the entry that is about to be free'd
+ */
+static void
+update_next_cache_sme (struct GNUNET_CONTAINER_MultiPeerMap *map,
+ const struct SmallMapEntry *sme)
+{
+ for (unsigned int i=0;i<map->next_cache_off;i++)
+ if (map->next_cache[i].sme == sme)
+ map->next_cache[i].sme = sme->next;
+}
+
+
/**
* Remove the given key-value pair from the map. Note that if the
* key-value pair is in the map multiple times, only one of the pairs
* @param map the map
* @param key key of the key-value pair
* @param value value of the key-value pair
- * @return GNUNET_YES on success, GNUNET_NO if the key-value pair
+ * @return #GNUNET_YES on success, #GNUNET_NO if the key-value pair
* is not in the map
*/
int
unsigned int i;
map->modification_counter++;
-
i = idx_of (map, key);
me = map->map[i];
if (map->use_small_entries)
{
- struct SmallMapEntry *sme;
- struct SmallMapEntry *p;
+ struct SmallMapEntry *p = NULL;
- p = NULL;
- for (sme = me.sme; NULL != sme; sme = sme->next)
+ for (struct SmallMapEntry *sme = me.sme; NULL != sme; sme = sme->next)
{
if ((0 == memcmp (key, sme->key, sizeof (struct GNUNET_PeerIdentity))) &&
(value == sme->value))
map->map[i].sme = sme->next;
else
p->next = sme->next;
+ update_next_cache_sme (map,
+ sme);
GNUNET_free (sme);
map->size--;
return GNUNET_YES;
}
else
{
- struct BigMapEntry *bme;
- struct BigMapEntry *p;
+ struct BigMapEntry *p = NULL;
- p = NULL;
- for (bme = me.bme; NULL != bme; bme = bme->next)
+ for (struct BigMapEntry *bme = me.bme; NULL != bme; bme = bme->next)
{
- if ((0 == memcmp (key, &bme->key, sizeof (struct GNUNET_PeerIdentity))) &&
+ if ((0 == memcmp (key,
+ &bme->key,
+ sizeof (struct GNUNET_PeerIdentity))) &&
(value == bme->value))
{
if (NULL == p)
map->map[i].bme = bme->next;
else
p->next = bme->next;
+ update_next_cache_bme (map,
+ bme);
GNUNET_free (bme);
map->size--;
return GNUNET_YES;
* @return number of values removed
*/
int
-GNUNET_CONTAINER_multipeermap_remove_all (struct GNUNET_CONTAINER_MultiPeerMap
- *map, const struct GNUNET_PeerIdentity *key)
+GNUNET_CONTAINER_multipeermap_remove_all (struct GNUNET_CONTAINER_MultiPeerMap *map,
+ const struct GNUNET_PeerIdentity *key)
{
union MapEntry me;
unsigned int i;
sme = me.sme;
while (NULL != sme)
{
- if (0 == memcmp (key, sme->key, sizeof (struct GNUNET_PeerIdentity)))
+ if (0 == memcmp (key,
+ sme->key,
+ sizeof (struct GNUNET_PeerIdentity)))
{
if (NULL == p)
map->map[i].sme = sme->next;
else
p->next = sme->next;
+ update_next_cache_sme (map,
+ sme);
GNUNET_free (sme);
map->size--;
if (NULL == p)
sme = map->map[i].sme;
else
sme = p->next;
- ret++;
+ ret++;
}
else
{
bme = me.bme;
while (NULL != bme)
{
- if (0 == memcmp (key, &bme->key, sizeof (struct GNUNET_PeerIdentity)))
+ if (0 == memcmp (key,
+ &bme->key,
+ sizeof (struct GNUNET_PeerIdentity)))
{
if (NULL == p)
map->map[i].bme = bme->next;
else
p->next = bme->next;
+ update_next_cache_bme (map,
+ bme);
GNUNET_free (bme);
map->size--;
if (NULL == p)
*
* @param map the map
* @param key the key to test if a value exists for it
- * @return GNUNET_YES if such a value exists,
- * GNUNET_NO if not
+ * @return #GNUNET_YES if such a value exists,
+ * #GNUNET_NO if not
*/
int
-GNUNET_CONTAINER_multipeermap_contains (const struct
- GNUNET_CONTAINER_MultiPeerMap *map,
+GNUNET_CONTAINER_multipeermap_contains (const struct GNUNET_CONTAINER_MultiPeerMap *map,
const struct GNUNET_PeerIdentity *key)
{
union MapEntry me;
me = map->map[idx_of (map, key)];
if (map->use_small_entries)
{
- struct SmallMapEntry *sme;
-
- for (sme = me.sme; NULL != sme; sme = sme->next)
+ for (struct SmallMapEntry *sme = me.sme; NULL != sme; sme = sme->next)
if (0 == memcmp (key, sme->key, sizeof (struct GNUNET_PeerIdentity)))
return GNUNET_YES;
}
else
{
- struct BigMapEntry *bme;
-
- for (bme = me.bme; NULL != bme; bme = bme->next)
+ for (struct BigMapEntry *bme = me.bme; NULL != bme; bme = bme->next)
if (0 == memcmp (key, &bme->key, sizeof (struct GNUNET_PeerIdentity)))
return GNUNET_YES;
}
* @param map the map
* @param key the key to test if a value exists for it
* @param value value to test for
- * @return GNUNET_YES if such a value exists,
- * GNUNET_NO if not
+ * @return #GNUNET_YES if such a value exists,
+ * #GNUNET_NO if not
*/
int
-GNUNET_CONTAINER_multipeermap_contains_value (const struct
- GNUNET_CONTAINER_MultiPeerMap
- *map, const struct GNUNET_PeerIdentity *key,
+GNUNET_CONTAINER_multipeermap_contains_value (const struct GNUNET_CONTAINER_MultiPeerMap *map,
+ const struct GNUNET_PeerIdentity *key,
const void *value)
{
union MapEntry me;
me = map->map[idx_of (map, key)];
if (map->use_small_entries)
{
- struct SmallMapEntry *sme;
-
- for (sme = me.sme; NULL != sme; sme = sme->next)
- if ( (0 == memcmp (key, sme->key, sizeof (struct GNUNET_PeerIdentity))) &&
+ for (struct SmallMapEntry *sme = me.sme; NULL != sme; sme = sme->next)
+ if ( (0 == memcmp (key,
+ sme->key,
+ sizeof (struct GNUNET_PeerIdentity))) &&
(sme->value == value) )
return GNUNET_YES;
}
else
{
- struct BigMapEntry *bme;
-
- for (bme = me.bme; NULL != bme; bme = bme->next)
- if ( (0 == memcmp (key, &bme->key, sizeof (struct GNUNET_PeerIdentity))) &&
+ for (struct BigMapEntry *bme = me.bme; NULL != bme; bme = bme->next)
+ if ( (0 == memcmp (key,
+ &bme->key,
+ sizeof (struct GNUNET_PeerIdentity))) &&
(bme->value == value) )
return GNUNET_YES;
}
unsigned int old_len;
unsigned int new_len;
unsigned int idx;
- unsigned int i;
-
- map->modification_counter++;
old_map = map->map;
old_len = map->map_length;
+ GNUNET_assert (0 != old_len);
new_len = old_len * 2;
- new_map = GNUNET_malloc (sizeof (union MapEntry) * new_len);
+ if (0 == new_len) /* 2^31 * 2 == 0 */
+ new_len = old_len; /* never use 0 */
+ if (new_len == old_len)
+ return; /* nothing changed */
+ new_map = GNUNET_malloc_large (new_len *
+ sizeof (union MapEntry));
+ if (NULL == new_map)
+ return; /* grow not possible */
+ map->modification_counter++;
map->map_length = new_len;
map->map = new_map;
- for (i = 0; i < old_len; i++)
+ for (unsigned int i = 0; i < old_len; i++)
{
if (map->use_small_entries)
{
struct BigMapEntry *bme;
while (NULL != (bme = old_map[i].bme))
- {
+ {
old_map[i].bme = bme->next;
idx = idx_of (map, &bme->key);
bme->next = new_map[idx].bme;
* @param opt options for put
* @return #GNUNET_OK on success,
* #GNUNET_NO if a value was replaced (with REPLACE)
- * #GNUNET_SYSERR if GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY was the option and the
+ * #GNUNET_SYSERR if #GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY was the option and the
* value already exists
*/
int
* #GNUNET_SYSERR if it aborted iteration
*/
int
-GNUNET_CONTAINER_multipeermap_get_multiple (const struct GNUNET_CONTAINER_MultiPeerMap *map,
+GNUNET_CONTAINER_multipeermap_get_multiple (struct GNUNET_CONTAINER_MultiPeerMap *map,
const struct GNUNET_PeerIdentity *key,
GNUNET_CONTAINER_PeerMapIterator it,
void *it_cls)
{
int count;
union MapEntry me;
+ union MapEntry *ce;
+ ce = &map->next_cache[map->next_cache_off];
+ GNUNET_assert (++map->next_cache_off < NEXT_CACHE_SIZE);
count = 0;
me = map->map[idx_of (map, key)];
if (map->use_small_entries)
{
struct SmallMapEntry *sme;
- struct SmallMapEntry *nxt;
- nxt = me.sme;
- while (NULL != (sme = nxt))
+ ce->sme = me.sme;
+ while (NULL != (sme = ce->sme))
{
- nxt = sme->next;
- if (0 != memcmp (key, sme->key, sizeof (struct GNUNET_PeerIdentity)))
+ ce->sme = sme->next;
+ if (0 != memcmp (key,
+ sme->key,
+ sizeof (struct GNUNET_PeerIdentity)))
continue;
- if ((it != NULL) && (GNUNET_OK != it (it_cls, key, sme->value)))
+ if ( (NULL != it) &&
+ (GNUNET_OK != it (it_cls,
+ key,
+ sme->value)))
+ {
+ GNUNET_assert (--map->next_cache_off < NEXT_CACHE_SIZE);
return GNUNET_SYSERR;
+ }
count++;
}
}
else
{
struct BigMapEntry *bme;
- struct BigMapEntry *nxt;
- nxt = me.bme;
- while (NULL != (bme = nxt))
+ ce->bme = me.bme;
+ while (NULL != (bme = ce->bme))
{
- nxt = bme->next;
- if (0 != memcmp (key, &bme->key, sizeof (struct GNUNET_PeerIdentity)))
+ ce->bme = bme->next;
+ if (0 != memcmp (key,
+ &bme->key,
+ sizeof (struct GNUNET_PeerIdentity)))
continue;
- if ((it != NULL) && (GNUNET_OK != it (it_cls, key, bme->value)))
+ if ( (NULL != it) &&
+ (GNUNET_OK != it (it_cls,
+ key,
+ bme->value)))
+ {
+ GNUNET_assert (--map->next_cache_off < NEXT_CACHE_SIZE);
return GNUNET_SYSERR;
+ }
count++;
}
}
+ GNUNET_assert (--map->next_cache_off < NEXT_CACHE_SIZE);
return count;
}
+/**
+ * @ingroup hashmap
+ * Call @a it on a random value from the map, or not at all
+ * if the map is empty. Note that this function has linear
+ * complexity (in the size of the map).
+ *
+ * @param map the map
+ * @param it function to call on a random entry
+ * @param it_cls extra argument to @a it
+ * @return the number of key value pairs processed, zero or one.
+ */
+unsigned int
+GNUNET_CONTAINER_multipeermap_get_random (const struct GNUNET_CONTAINER_MultiPeerMap *map,
+ GNUNET_CONTAINER_PeerMapIterator it,
+ void *it_cls)
+{
+ unsigned int off;
+ union MapEntry me;
+
+ if (0 == map->size)
+ return 0;
+ if (NULL == it)
+ return 1;
+ off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
+ map->size);
+ for (unsigned int idx = 0; idx < map->map_length; idx++)
+ {
+ me = map->map[idx];
+ if (map->use_small_entries)
+ {
+ struct SmallMapEntry *sme;
+ struct SmallMapEntry *nxt;
+
+ nxt = me.sme;
+ while (NULL != (sme = nxt))
+ {
+ nxt = sme->next;
+ if (0 == off)
+ {
+ if (GNUNET_OK != it (it_cls,
+ sme->key,
+ sme->value))
+ return GNUNET_SYSERR;
+ return 1;
+ }
+ off--;
+ }
+ }
+ else
+ {
+ struct BigMapEntry *bme;
+ struct BigMapEntry *nxt;
+
+ nxt = me.bme;
+ while (NULL != (bme = nxt))
+ {
+ nxt = bme->next;
+ if (0 == off)
+ {
+ if (GNUNET_OK != it (it_cls,
+ &bme->key,
+ bme->value))
+ return GNUNET_SYSERR;
+ return 1;
+ }
+ off--;
+ }
+ }
+ }
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+}
+
+
/**
* Create an iterator for a multipeermap.
* The iterator can be used to retrieve all the elements in the multipeermap
projects / oweals / gnunet.git / blobdiff