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/* $Id: hashtab.h 5944 2002-12-08 02:33:08Z rra $
**
** Generic hash table interface.
**
** Written by Russ Allbery <rra@stanford.edu>
** This work is hereby placed in the public domain by its author.
**
** A hash table takes a hash function that acts on keys, a function to
** extract the key from a data item stored in a hash, a function that takes
** a key and a data item and returns true if the key matches, and a
** function to be called on any data item being deleted from the hash.
**
** hash_create creates a hash and hash_free frees all the space allocated
** by one. hash_insert, hash_replace, and hash_delete modify it, and
** hash_lookup extracts values. hash_traverse can be used to walk the
** hash, and hash_count returns the number of elements currently stored in
** the hash. hash_searches, hash_collisions, and hash_expansions extract
** performance and debugging statistics.
*/
#ifndef INN_HASHTAB_H
#define INN_HASHTAB_H 1
#include <inn/defines.h>
BEGIN_DECLS
/* The layout of this struct is entirely internal to the implementation. */
struct hash;
/* Data types for function pointers used by the hash table interface. */
typedef unsigned long (*hash_func)(const void *);
typedef const void * (*hash_key_func)(const void *);
typedef bool (*hash_equal_func)(const void *, const void *);
typedef void (*hash_delete_func)(void *);
typedef void (*hash_traverse_func)(void *, void *);
/* Generic hash table interface. */
struct hash * hash_create(size_t, hash_func, hash_key_func,
hash_equal_func, hash_delete_func);
void hash_free(struct hash *);
void * hash_lookup(struct hash *, const void *key);
bool hash_insert(struct hash *, const void *key, void *datum);
bool hash_replace(struct hash *, const void *key, void *datum);
bool hash_delete(struct hash *, const void *key);
void hash_traverse(struct hash *, hash_traverse_func, void *);
unsigned long hash_count(struct hash *);
unsigned long hash_searches(struct hash *);
unsigned long hash_collisions(struct hash *);
unsigned long hash_expansions(struct hash *);
/* Hash functions available for callers. */
unsigned long hash_string(const void *);
/* Functions useful for constructing new hashes. */
unsigned long hash_lookup2(const char *, size_t, unsigned long partial);
END_DECLS
#endif /* INN_HASHTAB_H */
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