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75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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Unix SMB/CIFS implementation.
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Copyright (C) Ying Chen 2000.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _HASH_H_
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#define _HASH_H_
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#define MAX_HASH_TABLE_SIZE 16384
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#define HASH_TABLE_INCREMENT 2
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typedef int (*compare_function)(char *, char *);
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typedef int (*hash_function)(int, char *);
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/*
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* lru_link: links the node to the LRU list.
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* hash_elem: the pointer to the element that is tied onto the link.
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*/
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typedef struct lru_node {
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ubi_dlNode lru_link;
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void *hash_elem;
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} lru_node;
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/*
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* bucket_link: link the hash element to the bucket chain that it belongs to.
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* lru_link: this element ties the hash element to the lru list.
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* bucket: a pointer to the hash bucket that this element belongs to.
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* value: a pointer to the hash element content. It can be anything.
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* key: stores the string key. The hash_element is always allocated with
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* more memory space than the structure shown below to accomodate the space
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* used for the whole string. But the memory is always appended at the
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* end of the structure, so keep "key" at the end of the structure.
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* Don't move it.
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*/
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typedef struct hash_element {
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ubi_dlNode bucket_link;
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lru_node lru_link;
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ubi_dlList *bucket;
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void *value;
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char key[1];
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} hash_element;
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/*
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* buckets: a list of buckets, implemented as a dLinkList.
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* lru_chain: the lru list of all the hash elements.
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* num_elements: the # of elements in the hash table.
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* size: the hash table size.
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* comp_func: the compare function used during hash key comparisons.
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*/
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typedef struct hash_table {
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ubi_dlList *buckets;
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ubi_dlList lru_chain;
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unsigned num_elements;
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unsigned size;
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compare_function comp_func;
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} hash_table;
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#endif /* _HASH_H_ */
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