+++ /dev/null
-/*
-
- silcidcache.c
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 2000 - 2007 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(NULL, 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(NULL, count, silc_hash_utf8_string,
- NULL, silc_hash_utf8_compare, NULL,
- NULL, NULL, TRUE);
- cache->context_table = silc_hash_table_alloc(NULL, 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 (!cache)
- return NULL;
- if (!name && !id && !context)
- 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));
-
- if (id) {
- /* See if this entry is added already to cache */
- if (silc_idcache_find_by_id_one(cache, id, NULL)) {
- SILC_LOG_ERROR(("Attempted to add same ID twice to ID Cache, id %s",
- silc_id_render(id, cache->id_type)));
- SILC_ASSERT(FALSE);
- goto err;
- }
- }
-
- /* Add the new entry to the hash tables */
- if (id)
- 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;
-
- if (!cache)
- return 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 (!cache)
- return FALSE;
-
- 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 (!cache)
- return FALSE;
-
- 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 *new_id, char *new_name,
- SilcBool free_old_name)
-{
- if (!cache)
- return FALSE;
-
- if (new_id) {
- if (entry->id) {
- if (!silc_hash_table_del_by_context(cache->id_table, entry->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;
- } else {
- entry->id = new_id;
- }
-
- if (!silc_hash_table_add(cache->id_table, entry->id, entry))
- return FALSE;
- }
-
- if (new_name) {
- if (entry->name)
- if (!silc_hash_table_del_by_context(cache->name_table, entry->name,
- entry))
- return FALSE;
-
- if (free_old_name)
- silc_free(entry->name);
- entry->name = new_name;
-
- if (!silc_hash_table_add(cache->name_table, entry->name, entry))
- return FALSE;
- }
-
- return TRUE;
-}
-
-/* Update entry by context */
-
-SilcBool silc_idcache_update_by_context(SilcIDCache cache, void *context,
- void *new_id, char *new_name,
- SilcBool free_old_name)
-{
- SilcIDCacheEntry c;
-
- if (!cache)
- return FALSE;
-
- if (!silc_hash_table_find(cache->context_table, context, NULL, (void *)&c))
- return FALSE;
-
- return silc_idcache_update(cache, c, new_id, new_name, free_old_name);
-}
-
-/* Move entry to another cache */
-
-SilcBool silc_idcache_move(SilcIDCache from_cache, SilcIDCache to_cache,
- SilcIDCacheEntry entry)
-{
- SilcIDCacheEntry c;
-
- SILC_LOG_DEBUG(("Moving entry %p from %p cache to %p cache", entry,
- from_cache, to_cache));
-
- if (!from_cache || !to_cache || !entry)
- return FALSE;
-
- if (from_cache->id_type != to_cache->id_type) {
- SILC_LOG_ERROR(("Incompatible ID caches, cannot move entry"));
- return FALSE;
- }
-
- if (entry->context) {
- if (!silc_hash_table_find(from_cache->context_table, entry->context,
- NULL, (void *)&c))
- return FALSE;
- } else if (entry->name) {
- if (!silc_hash_table_find(from_cache->name_table, entry->name,
- NULL, (void *)&c))
- return FALSE;
- } else if (entry->id) {
- if (!silc_hash_table_find(from_cache->id_table, entry->id,
- NULL, (void *)&c))
- return FALSE;
- } else {
- return FALSE;
- }
-
- if (entry != c)
- return FALSE;
-
- /* See if this entry is added already to cache */
- if (c->id && silc_idcache_find_by_id_one(to_cache, c->id, NULL)) {
- SILC_LOG_ERROR(("Attempted to add same ID twice to ID Cache, id %s",
- silc_id_render(c->id, to_cache->id_type)));
- SILC_ASSERT(FALSE);
- return FALSE;
- }
-
- /* Remove from original cache */
- if (c->name)
- silc_hash_table_del_by_context(from_cache->name_table, c->name, c);
- if (c->context)
- silc_hash_table_del_by_context(from_cache->context_table, c->context, c);
- if (c->id)
- silc_hash_table_del_by_context(from_cache->id_table, c->id, c);
-
- /* Move to the other cache */
- if (c->id)
- silc_hash_table_add(to_cache->id_table, c->id, c);
- if (c->name)
- silc_hash_table_add(to_cache->name_table, c->name, c);
- if (c->context)
- silc_hash_table_add(to_cache->context_table, c->context, c);
-
- 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 (!cache || !ret_list)
- return FALSE;
-
- if (!silc_hash_table_count(cache->id_table))
- return FALSE;
-
- silc_list_init(*ret_list, struct SilcIDCacheEntryStruct, next);
- 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 (!cache || !ret_list)
- return FALSE;
-
- if (!silc_hash_table_count(cache->id_table))
- return FALSE;
-
- silc_list_init(*ret_list, struct SilcIDCacheEntryStruct, next);
- 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)
-{
- if (!cache)
- return FALSE;
- 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)
-{
- if (!cache)
- return FALSE;
- 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 (!cache || !ret_list)
- return FALSE;
-
- if (!silc_hash_table_count(cache->name_table))
- return FALSE;
-
- silc_list_init(*ret_list, struct SilcIDCacheEntryStruct, next);
- 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)
-{
- if (!cache)
- return FALSE;
- return silc_hash_table_find(cache->name_table, name, NULL, (void *)ret);
-}
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