/* $OpenBSD: lhash.h,v 1.12 2014/06/12 15:49:29 deraadt Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* Header for dynamic hash table routines
 * Author - Eric Young
 */

#ifndef HEADER_LHASH_H
#define HEADER_LHASH_H

#include <openssl/opensslconf.h>

#include <stdio.h>

#ifndef OPENSSL_NO_BIO
#include <openssl/bio.h>
#endif

#ifdef  __cplusplus
extern "C" {
#endif

typedef struct lhash_node_st {
	void *data;
	struct lhash_node_st *next;
#ifndef OPENSSL_NO_HASH_COMP
	unsigned long hash;
#endif
} LHASH_NODE;

typedef int (*LHASH_COMP_FN_TYPE)(const void *, const void *);
typedef unsigned long (*LHASH_HASH_FN_TYPE)(const void *);
typedef void (*LHASH_DOALL_FN_TYPE)(void *);
typedef void (*LHASH_DOALL_ARG_FN_TYPE)(void *, void *);

/* Macros for declaring and implementing type-safe wrappers for LHASH callbacks.
 * This way, callbacks can be provided to LHASH structures without function
 * pointer casting and the macro-defined callbacks provide per-variable casting
 * before deferring to the underlying type-specific callbacks. NB: It is
 * possible to place a "static" in front of both the DECLARE and IMPLEMENT
 * macros if the functions are strictly internal. */

/* First: "hash" functions */
#define DECLARE_LHASH_HASH_FN(name, o_type) \
	unsigned long name##_LHASH_HASH(const void *);
#define IMPLEMENT_LHASH_HASH_FN(name, o_type) \
	unsigned long name##_LHASH_HASH(const void *arg) { \
		const o_type *a = arg; \
		return name##_hash(a); }
#define LHASH_HASH_FN(name) name##_LHASH_HASH

/* Second: "compare" functions */
#define DECLARE_LHASH_COMP_FN(name, o_type) \
	int name##_LHASH_COMP(const void *, const void *);
#define IMPLEMENT_LHASH_COMP_FN(name, o_type) \
	int name##_LHASH_COMP(const void *arg1, const void *arg2) { \
		const o_type *a = arg1;		    \
		const o_type *b = arg2; \
		return name##_cmp(a,b); }
#define LHASH_COMP_FN(name) name##_LHASH_COMP

/* Third: "doall" functions */
#define DECLARE_LHASH_DOALL_FN(name, o_type) \
	void name##_LHASH_DOALL(void *);
#define IMPLEMENT_LHASH_DOALL_FN(name, o_type) \
	void name##_LHASH_DOALL(void *arg) { \
		o_type *a = arg; \
		name##_doall(a); }
#define LHASH_DOALL_FN(name) name##_LHASH_DOALL

/* Fourth: "doall_arg" functions */
#define DECLARE_LHASH_DOALL_ARG_FN(name, o_type, a_type) \
	void name##_LHASH_DOALL_ARG(void *, void *);
#define IMPLEMENT_LHASH_DOALL_ARG_FN(name, o_type, a_type) \
	void name##_LHASH_DOALL_ARG(void *arg1, void *arg2) { \
		o_type *a = arg1; \
		a_type *b = arg2; \
		name##_doall_arg(a, b); }
#define LHASH_DOALL_ARG_FN(name) name##_LHASH_DOALL_ARG

typedef struct lhash_st {
	LHASH_NODE **b;
	LHASH_COMP_FN_TYPE comp;
	LHASH_HASH_FN_TYPE hash;
	unsigned int num_nodes;
	unsigned int num_alloc_nodes;
	unsigned int p;
	unsigned int pmax;
	unsigned long up_load; /* load times 256 */
	unsigned long down_load; /* load times 256 */
	unsigned long num_items;

	unsigned long num_expands;
	unsigned long num_expand_reallocs;
	unsigned long num_contracts;
	unsigned long num_contract_reallocs;
	unsigned long num_hash_calls;
	unsigned long num_comp_calls;
	unsigned long num_insert;
	unsigned long num_replace;
	unsigned long num_delete;
	unsigned long num_no_delete;
	unsigned long num_retrieve;
	unsigned long num_retrieve_miss;
	unsigned long num_hash_comps;

	int error;
} _LHASH;	/* Do not use _LHASH directly, use LHASH_OF
		 * and friends */

#define LH_LOAD_MULT	256

/* Indicates a malloc() error in the last call, this is only bad
 * in lh_insert(). */
#define lh_error(lh)	((lh)->error)

_LHASH *lh_new(LHASH_HASH_FN_TYPE h, LHASH_COMP_FN_TYPE c);
void lh_free(_LHASH *lh);
void *lh_insert(_LHASH *lh, void *data);
void *lh_delete(_LHASH *lh, const void *data);
void *lh_retrieve(_LHASH *lh, const void *data);
void lh_doall(_LHASH *lh, LHASH_DOALL_FN_TYPE func);
void lh_doall_arg(_LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, void *arg);
unsigned long lh_strhash(const char *c);
unsigned long lh_num_items(const _LHASH *lh);

void lh_stats(const _LHASH *lh, FILE *out);
void lh_node_stats(const _LHASH *lh, FILE *out);
void lh_node_usage_stats(const _LHASH *lh, FILE *out);

#ifndef OPENSSL_NO_BIO
void lh_stats_bio(const _LHASH *lh, BIO *out);
void lh_node_stats_bio(const _LHASH *lh, BIO *out);
void lh_node_usage_stats_bio(const _LHASH *lh, BIO *out);
#endif

/* Type checking... */

#define LHASH_OF(type) struct lhash_st_##type

#define DECLARE_LHASH_OF(type) LHASH_OF(type) { int dummy; }

#define CHECKED_LHASH_OF(type,lh) \
  ((_LHASH *)CHECKED_PTR_OF(LHASH_OF(type),lh))

/* Define wrapper functions. */
#define LHM_lh_new(type, name) \
  ((LHASH_OF(type) *)lh_new(LHASH_HASH_FN(name), LHASH_COMP_FN(name)))
#define LHM_lh_error(type, lh) \
  lh_error(CHECKED_LHASH_OF(type,lh))
#define LHM_lh_insert(type, lh, inst) \
  ((type *)lh_insert(CHECKED_LHASH_OF(type, lh), \
		     CHECKED_PTR_OF(type, inst)))
#define LHM_lh_retrieve(type, lh, inst) \
  ((type *)lh_retrieve(CHECKED_LHASH_OF(type, lh), \
		       CHECKED_PTR_OF(type, inst)))
#define LHM_lh_delete(type, lh, inst) \
  ((type *)lh_delete(CHECKED_LHASH_OF(type, lh),			\
		     CHECKED_PTR_OF(type, inst)))
#define LHM_lh_doall(type, lh,fn) lh_doall(CHECKED_LHASH_OF(type, lh), fn)
#define LHM_lh_doall_arg(type, lh, fn, arg_type, arg) \
  lh_doall_arg(CHECKED_LHASH_OF(type, lh), fn, CHECKED_PTR_OF(arg_type, arg))
#define LHM_lh_num_items(type, lh) lh_num_items(CHECKED_LHASH_OF(type, lh))
#define LHM_lh_down_load(type, lh) (CHECKED_LHASH_OF(type, lh)->down_load)
#define LHM_lh_node_stats_bio(type, lh, out) \
  lh_node_stats_bio(CHECKED_LHASH_OF(type, lh), out)
#define LHM_lh_node_usage_stats_bio(type, lh, out) \
  lh_node_usage_stats_bio(CHECKED_LHASH_OF(type, lh), out)
#define LHM_lh_stats_bio(type, lh, out) \
  lh_stats_bio(CHECKED_LHASH_OF(type, lh), out)
#define LHM_lh_free(type, lh) lh_free(CHECKED_LHASH_OF(type, lh))

DECLARE_LHASH_OF(OPENSSL_STRING);
DECLARE_LHASH_OF(OPENSSL_CSTRING);

#ifdef  __cplusplus
}
#endif

#endif
