--- /dev/null
+/*
+
+ silcidcache.c
+
+ Author: Pekka Riikonen <priikone@silcnet.org>
+
+ Copyright (C) 2000 - 2006 Pekka Riikonen
+
+ This program 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; version 2 of the License.
+
+ This program 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.
+
+*/
+/* $Id$ */
+
+#include "silc.h"
+#include "silcidcache.h"
+
+/************************** Types and definitions ***************************/
+
+/* ID Cache context */
+struct SilcIDCacheStruct {
+ SilcHashTable id_table; /* ID hash table */
+ SilcHashTable name_table; /* Name hash table */
+ SilcHashTable context_table; /* Context hash table */
+ SilcIDCacheDestructor destructor; /* Entry destructor */
+ void *context; /* Destructor context */
+ SilcIdType id_type; /* Type of ID cache */
+};
+
+
+/************************ Static utility functions **************************/
+
+/* Callback that is called by the hash table routine when traversing
+ entries in the hash table. */
+
+static void silc_idcache_get_all_foreach(void *key, void *context,
+ void *user_context)
+{
+ SilcList *list = user_context;
+ if (!context)
+ return;
+ silc_list_add(*list, context);
+}
+
+/* Cache entry destructor */
+
+static void silc_idcache_destructor(SilcIDCache cache,
+ SilcIDCacheEntry entry,
+ void *app_context)
+{
+ if (cache->destructor)
+ cache->destructor(cache, entry, cache->destructor, app_context);
+
+ memset(entry, 'F', sizeof(*entry));
+ silc_free(entry);
+}
+
+
+/****************************** Public API **********************************/
+
+/* Allocates new ID cache object. */
+
+SilcIDCache silc_idcache_alloc(SilcUInt32 count, SilcIdType id_type,
+ SilcIDCacheDestructor destructor,
+ void *destructor_context)
+{
+ SilcIDCache cache;
+
+ SILC_LOG_DEBUG(("Allocating new cache"));
+
+ cache = silc_calloc(1, sizeof(*cache));
+ if (!cache)
+ return NULL;
+
+ cache->id_table = silc_hash_table_alloc(count, silc_hash_id,
+ SILC_32_TO_PTR(id_type),
+ silc_hash_id_compare,
+ SILC_32_TO_PTR(id_type),
+ NULL, NULL, TRUE);
+ cache->name_table = silc_hash_table_alloc(count, silc_hash_utf8_string, NULL,
+ silc_hash_utf8_compare, NULL,
+ NULL, NULL, TRUE);
+ cache->context_table = silc_hash_table_alloc(count, silc_hash_ptr, NULL,
+ NULL, NULL, NULL, NULL, TRUE);
+ cache->destructor = destructor;
+ cache->context = destructor_context;
+ cache->id_type = id_type;
+
+ if (!cache->id_table || !cache->name_table || !cache->context_table) {
+ if (cache->id_table)
+ silc_hash_table_free(cache->id_table);
+ if (cache->name_table)
+ silc_hash_table_free(cache->name_table);
+ if (cache->context_table)
+ silc_hash_table_free(cache->context_table);
+ silc_free(cache);
+ return NULL;
+ }
+
+ return cache;
+}
+
+/* Frees ID cache object and cache entries */
+
+void silc_idcache_free(SilcIDCache cache)
+{
+ silc_hash_table_free(cache->id_table);
+ silc_hash_table_free(cache->name_table);
+ silc_hash_table_free(cache->context_table);
+ silc_free(cache);
+}
+
+/* Add new entry to cache */
+
+SilcIDCacheEntry
+silc_idcache_add(SilcIDCache cache, char *name, void *id, void *context)
+{
+ SilcIDCacheEntry c;
+
+ if (!id)
+ return NULL;
+
+ /* Allocate new cache entry */
+ c = silc_calloc(1, sizeof(*c));
+ if (!c)
+ return NULL;
+
+ c->id = id;
+ c->name = name;
+ c->context = context;
+
+ SILC_LOG_DEBUG(("Adding cache entry %p", c));
+
+ /* Add the new entry to the hash tables */
+
+ if (id) {
+ if (silc_idcache_find_by_id_one(cache, id, NULL)) {
+ SILC_LOG_ERROR(("Attempted to add same ID twice to ID Cache"));
+ goto err;
+ }
+ if (!silc_hash_table_add(cache->id_table, id, c))
+ goto err;
+ }
+ if (name)
+ if (!silc_hash_table_add(cache->name_table, name, c))
+ goto err;
+ if (context)
+ if (!silc_hash_table_add(cache->context_table, context, c))
+ goto err;
+
+ return c;
+
+ err:
+ if (c->name)
+ silc_hash_table_del_by_context(cache->name_table, c->name, c);
+ if (c->context)
+ silc_hash_table_del_by_context(cache->context_table, c->context, c);
+ if (c->id)
+ silc_hash_table_del_by_context(cache->id_table, c->id, c);
+ silc_free(c);
+
+ return NULL;
+}
+
+/* Delete cache entry from cache. */
+
+SilcBool silc_idcache_del(SilcIDCache cache, SilcIDCacheEntry entry,
+ void *app_context)
+{
+ SilcBool ret = FALSE;
+
+ SILC_LOG_DEBUG(("Deleting cache entry %p", entry));
+
+ if (entry->name)
+ ret = silc_hash_table_del_by_context(cache->name_table, entry->name,
+ entry);
+ if (entry->context)
+ ret = silc_hash_table_del_by_context(cache->context_table, entry->context,
+ entry);
+ if (entry->id)
+ ret = silc_hash_table_del_by_context(cache->id_table, entry->id,
+ entry);
+
+ if (ret)
+ silc_idcache_destructor(cache, entry, app_context);
+
+ return ret;
+}
+
+/* Deletes ID cache entry by ID. */
+
+SilcBool silc_idcache_del_by_id(SilcIDCache cache, void *id,
+ void *app_context)
+{
+ SilcIDCacheEntry c;
+
+ if (!silc_hash_table_find(cache->id_table, id, NULL, (void **)&c))
+ return FALSE;
+
+ return silc_idcache_del(cache, c, app_context);
+}
+
+/* Deletes ID cache entry by context. */
+
+SilcBool silc_idcache_del_by_context(SilcIDCache cache, void *context,
+ void *app_context)
+{
+ SilcIDCacheEntry c;
+
+ if (!silc_hash_table_find(cache->context_table, context, NULL, (void **)&c))
+ return FALSE;
+
+ return silc_idcache_del(cache, c, app_context);
+}
+
+/* Update entry */
+
+SilcBool silc_idcache_update(SilcIDCache cache, SilcIDCacheEntry entry,
+ void *old_id, void *new_id,
+ char *old_name, char *new_name)
+{
+ if (old_id && new_id) {
+ if (!silc_hash_table_del_by_context(cache->id_table, old_id, entry))
+ return FALSE;
+
+ if (cache->id_type == SILC_ID_CLIENT)
+ *(SilcClientID *)entry->id = *(SilcClientID *)new_id;
+ if (cache->id_type == SILC_ID_SERVER)
+ *(SilcServerID *)entry->id = *(SilcServerID *)new_id;
+ if (cache->id_type == SILC_ID_CHANNEL)
+ *(SilcChannelID *)entry->id = *(SilcChannelID *)new_id;
+
+ if (!silc_hash_table_add(cache->id_table, entry->id, entry))
+ return FALSE;
+ }
+
+ if (old_name && new_name) {
+ if (!silc_hash_table_del_by_context(cache->name_table, old_name, entry))
+ return FALSE;
+
+ entry->name = new_name;
+
+ if (!silc_hash_table_add(cache->name_table, entry->name, entry))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* Returns all cache entrys from the ID cache to the `ret' ID Cache List. */
+
+SilcBool silc_idcache_get_all(SilcIDCache cache, SilcList *ret_list)
+{
+ if (!ret_list)
+ return FALSE;
+
+ if (!silc_hash_table_count(cache->id_table))
+ return FALSE;
+
+ silc_hash_table_foreach(cache->id_table, silc_idcache_get_all_foreach,
+ ret_list);
+
+ if (!silc_list_count(*ret_list))
+ return FALSE;
+
+ return TRUE;
+}
+
+/* Find ID Cache entry by ID. May return multiple entries. */
+
+SilcBool silc_idcache_find_by_id(SilcIDCache cache, void *id,
+ SilcList *ret_list)
+{
+ if (!ret_list)
+ return FALSE;
+
+ if (!silc_hash_table_count(cache->id_table))
+ return FALSE;
+
+ silc_hash_table_find_foreach(cache->id_table, id,
+ silc_idcache_get_all_foreach, ret_list);
+
+ if (!silc_list_count(*ret_list))
+ return FALSE;
+
+ return TRUE;
+}
+
+/* Find one specific ID entry. Compare full IDs */
+
+SilcBool silc_idcache_find_by_id_one(SilcIDCache cache, void *id,
+ SilcIDCacheEntry *ret)
+{
+ return silc_hash_table_find_ext(cache->id_table, id, NULL, (void *)ret,
+ NULL, NULL,
+ silc_hash_id_compare_full,
+ SILC_32_TO_PTR(cache->id_type));
+}
+
+/* Finds cache entry by context. */
+
+SilcBool silc_idcache_find_by_context(SilcIDCache cache, void *context,
+ SilcIDCacheEntry *ret)
+{
+ return silc_hash_table_find(cache->context_table, context, NULL,
+ (void *)ret);
+}
+
+/* Find ID Cache entry by name. Returns list of cache entries. */
+
+SilcBool silc_idcache_find_by_name(SilcIDCache cache, char *name,
+ SilcList *ret_list)
+{
+ if (!ret_list)
+ return FALSE;
+
+ if (!silc_hash_table_count(cache->name_table))
+ return FALSE;
+
+ silc_hash_table_find_foreach(cache->name_table, name,
+ silc_idcache_get_all_foreach, ret_list);
+
+ if (!silc_list_count(*ret_list))
+ return FALSE;
+
+ return TRUE;
+}
+
+/* Find ID Cache entry by name. Returns one cache entry. */
+
+SilcBool silc_idcache_find_by_name_one(SilcIDCache cache, char *name,
+ SilcIDCacheEntry *ret)
+{
+ return silc_hash_table_find(cache->name_table, name, NULL, (void *)ret);
+}
projects / silc.git / blobdiff