83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* apk_hash.h - Alpine Package Keeper (APK)
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*
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* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
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* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#ifndef APK_HASH_H
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#define APK_HASH_H
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#include <stdlib.h>
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#include <stddef.h>
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#include "apk_defines.h"
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#include "apk_blob.h"
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typedef void *apk_hash_item;
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typedef unsigned long (*apk_hash_f)(apk_blob_t);
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typedef int (*apk_hash_compare_f)(apk_blob_t, apk_blob_t);
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typedef int (*apk_hash_compare_item_f)(apk_hash_item, apk_blob_t);
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typedef void (*apk_hash_delete_f)(apk_hash_item);
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typedef int (*apk_hash_enumerator_f)(apk_hash_item, void *ctx);
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struct apk_hash_ops {
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ptrdiff_t node_offset;
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apk_blob_t (*get_key)(apk_hash_item item);
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unsigned long (*hash_key)(apk_blob_t key);
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unsigned long (*hash_item)(apk_hash_item item);
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int (*compare)(apk_blob_t itemkey, apk_blob_t key);
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int (*compare_item)(apk_hash_item item, apk_blob_t key);
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void (*delete_item)(apk_hash_item item);
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};
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typedef struct hlist_node apk_hash_node;
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APK_ARRAY(apk_hash_array, struct hlist_head);
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struct apk_hash {
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const struct apk_hash_ops *ops;
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struct apk_hash_array *buckets;
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int num_items;
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};
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void apk_hash_init(struct apk_hash *h, const struct apk_hash_ops *ops,
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int num_buckets);
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void apk_hash_free(struct apk_hash *h);
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int apk_hash_foreach(struct apk_hash *h, apk_hash_enumerator_f e, void *ctx);
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apk_hash_item apk_hash_get_hashed(struct apk_hash *h, apk_blob_t key, unsigned long hash);
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void apk_hash_insert_hashed(struct apk_hash *h, apk_hash_item item, unsigned long hash);
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void apk_hash_delete_hashed(struct apk_hash *h, apk_blob_t key, unsigned long hash);
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static inline unsigned long apk_hash_from_key(struct apk_hash *h, apk_blob_t key)
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{
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return h->ops->hash_key(key);
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}
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static inline unsigned long apk_hash_from_item(struct apk_hash *h, apk_hash_item item)
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{
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if (h->ops->hash_item != NULL)
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return h->ops->hash_item(item);
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return apk_hash_from_key(h, h->ops->get_key(item));
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}
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static inline apk_hash_item apk_hash_get(struct apk_hash *h, apk_blob_t key)
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{
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return apk_hash_get_hashed(h, key, apk_hash_from_key(h, key));
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}
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static inline void apk_hash_insert(struct apk_hash *h, apk_hash_item item)
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{
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return apk_hash_insert_hashed(h, item, apk_hash_from_item(h, item));
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}
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static inline void apk_hash_delete(struct apk_hash *h, apk_blob_t key)
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{
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return apk_hash_delete_hashed(h, key, apk_hash_from_key(h, key));
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}
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#endif
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