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/*
Unix SMB/CIFS implementation.
Copyright (C) Ying Chen 2000.
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; either version 2 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _HASH_H_
#define _HASH_H_
#define MAX_HASH_TABLE_SIZE 16384
#define HASH_TABLE_INCREMENT 2
typedef int (*compare_function)(char *, char *);
typedef int (*hash_function)(int, char *);
/*
* lru_link: links the node to the LRU list.
* hash_elem: the pointer to the element that is tied onto the link.
*/
typedef struct lru_node {
ubi_dlNode lru_link;
void *hash_elem;
} lru_node;
/*
* bucket_link: link the hash element to the bucket chain that it belongs to.
* lru_link: this element ties the hash element to the lru list.
* bucket: a pointer to the hash bucket that this element belongs to.
* value: a pointer to the hash element content. It can be anything.
* key: stores the string key. The hash_element is always allocated with
* more memory space than the structure shown below to accomodate the space
* used for the whole string. But the memory is always appended at the
* end of the structure, so keep "key" at the end of the structure.
* Don't move it.
*/
typedef struct hash_element {
ubi_dlNode bucket_link;
lru_node lru_link;
ubi_dlList *bucket;
void *value;
char key[1];
} hash_element;
/*
* buckets: a list of buckets, implemented as a dLinkList.
* lru_chain: the lru list of all the hash elements.
* num_elements: the # of elements in the hash table.
* size: the hash table size.
* comp_func: the compare function used during hash key comparisons.
*/
typedef struct hash_table {
ubi_dlList *buckets;
ubi_dlList lru_chain;
int num_elements;
int size;
compare_function comp_func;
} hash_table;
#endif /* _HASH_H_ */
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