diff options
Diffstat (limited to 'mesalib/src/gallium/auxiliary/util/u_keymap.c')
| -rw-r--r-- | mesalib/src/gallium/auxiliary/util/u_keymap.c | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_keymap.c b/mesalib/src/gallium/auxiliary/util/u_keymap.c new file mode 100644 index 000000000..a06478b21 --- /dev/null +++ b/mesalib/src/gallium/auxiliary/util/u_keymap.c @@ -0,0 +1,318 @@ +/**************************************************************************
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * Key lookup/associative container.
+ *
+ * Like Jose's util_hash_table, based on CSO cache code for now.
+ *
+ * Author: Brian Paul
+ */
+
+
+#include "pipe/p_compiler.h"
+#include "util/u_debug.h"
+
+#include "cso_cache/cso_hash.h"
+
+#include "util/u_memory.h"
+#include "util/u_keymap.h"
+
+
+struct keymap
+{
+ struct cso_hash *cso;
+ unsigned key_size;
+ unsigned max_entries; /* XXX not obeyed net */
+ unsigned num_entries;
+ keymap_delete_func delete_func;
+};
+
+
+struct keymap_item
+{
+ void *key, *value;
+};
+
+
+/**
+ * This the default key-delete function used when the client doesn't
+ * provide one.
+ */
+static void
+default_delete_func(const struct keymap *map,
+ const void *key, void *data, void *user)
+{
+ FREE((void*) data);
+}
+
+
+static INLINE struct keymap_item *
+hash_table_item(struct cso_hash_iter iter)
+{
+ return (struct keymap_item *) cso_hash_iter_data(iter);
+}
+
+
+/**
+ * Return 4-byte hash key for a block of bytes.
+ */
+static unsigned
+hash(const void *key, unsigned keySize)
+{
+ unsigned i, hash;
+
+ keySize /= 4; /* convert from bytes to uints */
+
+ hash = 0;
+ for (i = 0; i < keySize; i++) {
+ hash ^= (i + 1) * ((const unsigned *) key)[i];
+ }
+
+ /*hash = hash ^ (hash >> 11) ^ (hash >> 22);*/
+
+ return hash;
+}
+
+
+/**
+ * Create a new map.
+ * \param keySize size of the keys in bytes
+ * \param maxEntries max number of entries to allow (~0 = infinity)
+ * \param deleteFunc optional callback to call when entries
+ * are deleted/replaced
+ */
+struct keymap *
+util_new_keymap(unsigned keySize, unsigned maxEntries,
+ keymap_delete_func deleteFunc)
+{
+ struct keymap *map = MALLOC_STRUCT(keymap);
+ if (!map)
+ return NULL;
+
+ map->cso = cso_hash_create();
+ if (!map->cso) {
+ FREE(map);
+ return NULL;
+ }
+
+ map->max_entries = maxEntries;
+ map->num_entries = 0;
+ map->key_size = keySize;
+ map->delete_func = deleteFunc ? deleteFunc : default_delete_func;
+
+ return map;
+}
+
+
+/**
+ * Delete/free a keymap and all entries. The deleteFunc that was given at
+ * create time will be called for each entry.
+ * \param user user-provided pointer passed through to the delete callback
+ */
+void
+util_delete_keymap(struct keymap *map, void *user)
+{
+ util_keymap_remove_all(map, user);
+ cso_hash_delete(map->cso);
+ FREE(map);
+}
+
+
+static INLINE struct cso_hash_iter
+hash_table_find_iter(const struct keymap *map, const void *key,
+ unsigned key_hash)
+{
+ struct cso_hash_iter iter;
+ struct keymap_item *item;
+
+ iter = cso_hash_find(map->cso, key_hash);
+ while (!cso_hash_iter_is_null(iter)) {
+ item = (struct keymap_item *) cso_hash_iter_data(iter);
+ if (!memcmp(item->key, key, map->key_size))
+ break;
+ iter = cso_hash_iter_next(iter);
+ }
+
+ return iter;
+}
+
+
+static INLINE struct keymap_item *
+hash_table_find_item(const struct keymap *map, const void *key,
+ unsigned key_hash)
+{
+ struct cso_hash_iter iter = hash_table_find_iter(map, key, key_hash);
+ if (cso_hash_iter_is_null(iter)) {
+ return NULL;
+ }
+ else {
+ return hash_table_item(iter);
+ }
+}
+
+
+/**
+ * Insert a new key + data pointer into the table.
+ * Note: we create a copy of the key, but not the data!
+ * If the key is already present in the table, replace the existing
+ * entry (calling the delete callback on the previous entry).
+ * If the maximum capacity of the map is reached an old entry
+ * will be deleted (the delete callback will be called).
+ */
+boolean
+util_keymap_insert(struct keymap *map, const void *key,
+ const void *data, void *user)
+{
+ unsigned key_hash;
+ struct keymap_item *item;
+ struct cso_hash_iter iter;
+
+ assert(map);
+ if (!map)
+ return FALSE;
+
+ key_hash = hash(key, map->key_size);
+
+ item = hash_table_find_item(map, key, key_hash);
+ if (item) {
+ /* call delete callback for old entry/item */
+ map->delete_func(map, item->key, item->value, user);
+ item->value = (void *) data;
+ return TRUE;
+ }
+
+ item = MALLOC_STRUCT(keymap_item);
+ if (!item)
+ return FALSE;
+
+ item->key = mem_dup(key, map->key_size);
+ item->value = (void *) data;
+
+ iter = cso_hash_insert(map->cso, key_hash, item);
+ if (cso_hash_iter_is_null(iter)) {
+ FREE(item);
+ return FALSE;
+ }
+
+ map->num_entries++;
+
+ return TRUE;
+}
+
+
+/**
+ * Look up a key in the map and return the associated data pointer.
+ */
+const void *
+util_keymap_lookup(const struct keymap *map, const void *key)
+{
+ unsigned key_hash;
+ struct keymap_item *item;
+
+ assert(map);
+ if (!map)
+ return NULL;
+
+ key_hash = hash(key, map->key_size);
+
+ item = hash_table_find_item(map, key, key_hash);
+ if (!item)
+ return NULL;
+
+ return item->value;
+}
+
+
+/**
+ * Remove an entry from the map.
+ * The delete callback will be called if the given key/entry is found.
+ * \param user passed to the delete callback as the last param.
+ */
+void
+util_keymap_remove(struct keymap *map, const void *key, void *user)
+{
+ unsigned key_hash;
+ struct cso_hash_iter iter;
+ struct keymap_item *item;
+
+ assert(map);
+ if (!map)
+ return;
+
+ key_hash = hash(key, map->key_size);
+
+ iter = hash_table_find_iter(map, key, key_hash);
+ if (cso_hash_iter_is_null(iter))
+ return;
+
+ item = hash_table_item(iter);
+ assert(item);
+ if (!item)
+ return;
+ map->delete_func(map, item->key, item->value, user);
+ FREE(item->key);
+ FREE(item);
+
+ map->num_entries--;
+
+ cso_hash_erase(map->cso, iter);
+}
+
+
+/**
+ * Remove all entries from the map, calling the delete callback for each.
+ * \param user passed to the delete callback as the last param.
+ */
+void
+util_keymap_remove_all(struct keymap *map, void *user)
+{
+ struct cso_hash_iter iter;
+ struct keymap_item *item;
+
+ assert(map);
+ if (!map)
+ return;
+
+ iter = cso_hash_first_node(map->cso);
+ while (!cso_hash_iter_is_null(iter)) {
+ item = (struct keymap_item *)
+ cso_hash_take(map->cso, cso_hash_iter_key(iter));
+ map->delete_func(map, item->key, item->value, user);
+ FREE(item->key);
+ FREE(item);
+ iter = cso_hash_first_node(map->cso);
+ }
+}
+
+
+extern void
+util_keymap_info(const struct keymap *map)
+{
+ debug_printf("Keymap %p: %u of max %u entries\n",
+ (void *) map, map->num_entries, map->max_entries);
+}
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