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/* hash.h
Definitions for hashing... */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Internet Systems Consortium, Inc.
* 950 Charter Street
* Redwood City, CA 94063
* <info@isc.org>
* http://www.isc.org/
*
* This software has been written for Internet Systems Consortium
* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
* To learn more about Internet Systems Consortium, see
* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
* ``http://www.nominum.com''.
*/
#ifndef OMAPI_HASH_H
#define OMAPI_HASH_H
#define DEFAULT_HASH_SIZE 9973
/* The purpose of the hashed_object_t struct is to not match anything else. */
typedef struct {
int foo;
} hashed_object_t;
typedef isc_result_t (*hash_foreach_func)(const unsigned char *, unsigned,
void *);
typedef int (*hash_reference) (hashed_object_t **, hashed_object_t *,
const char *, int);
typedef int (*hash_dereference) (hashed_object_t **, const char *, int);
struct hash_bucket {
struct hash_bucket *next;
const unsigned char *name;
unsigned len;
hashed_object_t *value;
};
typedef int (*hash_comparator_t)(const void *, const void *, unsigned long);
struct hash_table {
unsigned hash_count;
struct hash_bucket *buckets [DEFAULT_HASH_SIZE];
hash_reference referencer;
hash_dereference dereferencer;
hash_comparator_t cmp;
int (*do_hash) (const unsigned char *, unsigned, unsigned);
};
struct named_hash {
struct named_hash *next;
const char *name;
struct hash_table *hash;
};
#define HASH_FUNCTIONS_DECL(name, bufarg, type, hashtype) \
void name##_hash_add (hashtype *, bufarg, unsigned, type *, \
const char *, int); \
void name##_hash_delete (hashtype *, bufarg, unsigned, \
const char *, int); \
int name##_hash_lookup (type **, hashtype *, bufarg, unsigned, \
const char *, int); \
int name##_hash_foreach (hashtype *, hash_foreach_func); \
int name##_new_hash (hashtype **, int, const char *, int); \
void name##_free_hash_table (hashtype **, const char *, int);
#define HASH_FUNCTIONS(name, bufarg, type, hashtype, ref, deref) \
void name##_hash_add (hashtype *table, \
bufarg buf, unsigned len, type *ptr, \
const char *file, int line) \
{ \
add_hash ((struct hash_table *)table, \
(const unsigned char *)buf, \
len, (hashed_object_t *)ptr, file, line); \
} \
\
void name##_hash_delete (hashtype *table, \
bufarg buf, unsigned len, const char *file, int line)\
{ \
delete_hash_entry ((struct hash_table *)table, \
(const unsigned char *)buf, \
len, file, line); \
} \
\
int name##_hash_lookup (type **ptr, hashtype *table, \
bufarg buf, unsigned len, const char *file, int line) \
{ \
return hash_lookup ((hashed_object_t **)ptr, \
(struct hash_table *)table, \
(const unsigned char *)buf, len, file, line); \
} \
\
int name##_hash_foreach (hashtype *table, hash_foreach_func func) \
{ \
return hash_foreach ((struct hash_table *)table, \
func); \
} \
\
int name##_new_hash (hashtype **tp, int c, const char *file, int line) \
{ \
return new_hash ((struct hash_table **)tp, \
(hash_reference)ref, (hash_dereference)deref, c, \
file, line); \
} \
\
void name##_free_hash_table (hashtype **table, const char *file, int line) \
{ \
free_hash_table ((struct hash_table **)table, file, line); \
}
void relinquish_hash_bucket_hunks (void);
int new_hash_table (struct hash_table **, int, const char *, int);
void free_hash_table (struct hash_table **, const char *, int);
struct hash_bucket *new_hash_bucket (const char *, int);
void free_hash_bucket (struct hash_bucket *, const char *, int);
int new_hash (struct hash_table **,
hash_reference, hash_dereference, int, const char *, int);
void add_hash (struct hash_table *,
const unsigned char *, unsigned, hashed_object_t *,
const char *, int);
void delete_hash_entry (struct hash_table *, const unsigned char *,
unsigned, const char *, int);
int hash_lookup (hashed_object_t **, struct hash_table *,
const unsigned char *, unsigned, const char *, int);
int hash_foreach (struct hash_table *, hash_foreach_func);
int casecmp (const void *s, const void *t, unsigned long len);
#endif /* OMAPI_HASH_H */
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