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/* apk_hash.h - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#ifndef APK_HASH_H
#define APK_HASH_H
#include <stdlib.h>
#include "apk_defines.h"
#include "apk_blob.h"
typedef void *apk_hash_item;
typedef unsigned long (*apk_hash_f)(apk_blob_t);
typedef int (*apk_hash_compare_f)(apk_blob_t, apk_blob_t);
typedef int (*apk_hash_compare_item_f)(apk_hash_item, apk_blob_t);
typedef void (*apk_hash_delete_f)(apk_hash_item);
typedef int (*apk_hash_enumerator_f)(apk_hash_item, void *ctx);
struct apk_hash_ops {
ptrdiff_t node_offset;
apk_blob_t (*get_key)(apk_hash_item item);
unsigned long (*hash_key)(apk_blob_t key);
unsigned long (*hash_item)(apk_hash_item item);
int (*compare)(apk_blob_t itemkey, apk_blob_t key);
int (*compare_item)(apk_hash_item item, apk_blob_t key);
void (*delete_item)(apk_hash_item item);
};
typedef struct hlist_node apk_hash_node;
APK_ARRAY(apk_hash_array, struct hlist_head);
struct apk_hash {
const struct apk_hash_ops *ops;
struct apk_hash_array *buckets;
int num_items;
};
void apk_hash_init(struct apk_hash *h, const struct apk_hash_ops *ops,
int num_buckets);
void apk_hash_free(struct apk_hash *h);
int apk_hash_foreach(struct apk_hash *h, apk_hash_enumerator_f e, void *ctx);
apk_hash_item apk_hash_get_hashed(struct apk_hash *h, apk_blob_t key, unsigned long hash);
void apk_hash_insert_hashed(struct apk_hash *h, apk_hash_item item, unsigned long hash);
void apk_hash_delete_hashed(struct apk_hash *h, apk_blob_t key, unsigned long hash);
static inline unsigned long apk_hash_from_key(struct apk_hash *h, apk_blob_t key)
{
return h->ops->hash_key(key);
}
static inline unsigned long apk_hash_from_item(struct apk_hash *h, apk_hash_item item)
{
if (h->ops->hash_item != NULL)
return h->ops->hash_item(item);
return apk_hash_from_key(h, h->ops->get_key(item));
}
static inline apk_hash_item apk_hash_get(struct apk_hash *h, apk_blob_t key)
{
return apk_hash_get_hashed(h, key, apk_hash_from_key(h, key));
}
static inline void apk_hash_insert(struct apk_hash *h, apk_hash_item item)
{
return apk_hash_insert_hashed(h, item, apk_hash_from_item(h, item));
}
static inline void apk_hash_delete(struct apk_hash *h, apk_blob_t key)
{
return apk_hash_delete_hashed(h, key, apk_hash_from_key(h, key));
}
#endif
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