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97b148c3b51dd80bff9008f68191aa392ad06a5a
apache/modules/ssl/ssl_util_table.h
Doug MacEachern 97b148c3b5 PR: 
Obtained from:
Submitted by:   Madhusudan Mathihalli <madhusudan_mathihalli@hp.com>
Reviewed by:	dougm
implement SSLSessionCache shmht and shmcb based on apr_rmm and apr_shm


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93942 13f79535-47bb-0310-9956-ffa450edef68
2002-03-14 23:31:23 +00:00

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/* _ _
** _ __ ___ ___ __| | ___ ___| | mod_ssl
** | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
** | | | | | | (_) | (_| | \__ \__ \ | www.modssl.org
** |_| |_| |_|\___/ \__,_|___|___/___/_| ftp.modssl.org
** |_____|
** ssl_util_table.h
** High Performance Hash Table Header
*/
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
* reserved.
*
* 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 above 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. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*/
/*
* Generic hash table defines
* Table 4.1.0 July-28-1998
*
* This library is a generic open hash table with buckets and
* linked lists. It is pretty high performance. Each element
* has a key and a data. The user indexes on the key to find the
* data.
*
* Copyright 1998 by Gray Watson <gray@letters.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose and without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies,
* and that the name of Gray Watson not be used in advertising or
* publicity pertaining to distribution of the document or software
* without specific, written prior permission.
*
* Gray Watson makes no representations about the suitability of the
* software described herein for any purpose. It is provided "as is"
* without express or implied warranty.
*/
#ifndef __SSL_UTIL_TABLE_H__
#define __SSL_UTIL_TABLE_H__
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/*
* To build a "key" in any of the below routines, pass in a pointer to
* the key and its size [i.e. sizeof(int), etc]. With any of the
* "key" or "data" arguments, if their size is < 0, it will do an
* internal strlen of the item and add 1 for the \0.
*
* If you are using firstkey() and nextkey() functions, be careful if,
* after starting your firstkey loop, you use delete or insert, it
* will not crash but may produce interesting results. If you are
* deleting from firstkey to NULL it will work fine.
*/
/* return types for table functions */
#define TABLE_ERROR_NONE 1 /* no error from function */
#define TABLE_ERROR_PNT 2 /* bad table pointer */
#define TABLE_ERROR_ARG_NULL 3 /* buffer args were null */
#define TABLE_ERROR_SIZE 4 /* size of data was bad */
#define TABLE_ERROR_OVERWRITE 5 /* key exists and we cant overwrite */
#define TABLE_ERROR_NOT_FOUND 6 /* key does not exist */
#define TABLE_ERROR_ALLOC 7 /* memory allocation error */
#define TABLE_ERROR_LINEAR 8 /* no linear access started */
#define TABLE_ERROR_OPEN 9 /* could not open file */
#define TABLE_ERROR_SEEK 10 /* could not seek to pos in file */
#define TABLE_ERROR_READ 11 /* could not read from file */
#define TABLE_ERROR_WRITE 12 /* could not write to file */
#define TABLE_ERROR_EMPTY 13 /* table is empty */
#define TABLE_ERROR_NOT_EMPTY 14 /* table contains data */
#define TABLE_ERROR_ALIGNMENT 15 /* invalid alignment value */
/*
* Table flags set with table_attr.
*/
/*
* Automatically adjust the number of table buckets on the fly.
* Whenever the number of entries gets above some threshold, the
* number of buckets is realloced to a new size and each entry is
* re-hashed. Although this may take some time when it re-hashes, the
* table will perform better over time.
*/
#define TABLE_FLAG_AUTO_ADJUST (1<<0)
/*
* If the above auto-adjust flag is set, also adjust the number of
* table buckets down as we delete entries.
*/
#define TABLE_FLAG_ADJUST_DOWN (1<<1)
/* structure to walk through the fields in a linear order */
typedef struct {
unsigned int tl_magic; /* magic structure to ensure correct init */
unsigned int tl_bucket_c; /* where in the table buck array we are */
unsigned int tl_entry_c; /* in the bucket, which entry we are on */
} table_linear_t;
typedef int (*table_compare_t)(const void *key1, const int key1_size,
const void *data1, const int data1_size,
const void *key2, const int key2_size,
const void *data2, const int data2_size);
#ifndef TABLE_PRIVATE
typedef void table_t;
typedef void table_entry_t;
#endif
/*
* Prototypes
*/
extern table_t *table_alloc(const unsigned int bucket_n, int *error_p, void *(*malloc_f)(void *opt_param, size_t size), void *(*calloc_f)(void *opt_param, size_t number, size_t size), void *(*realloc_f)(void *opt_param, void *ptr, size_t size), void (*free_f)(void *opt_param, void *ptr), void *opt_param);
extern int table_attr(table_t *table_p, const int attr);
extern int table_set_data_alignment(table_t *table_p, const int alignment);
extern int table_clear(table_t *table_p);
extern int table_free(table_t *table_p);
extern int table_insert_kd(table_t *table_p, const void *key_buf, const int key_size, const void *data_buf, const int data_size, void **key_buf_p, void **data_buf_p, const char overwrite_b);
extern int table_insert(table_t *table_p, const void *key_buf, const int key_size, const void *data_buf, const int data_size, void **data_buf_p, const char overwrite_b);
extern int table_retrieve(table_t *table_p, const void *key_buf, const int key_size, void **data_buf_p, int *data_size_p);
extern int table_delete(table_t *table_p, const void *key_buf, const int key_size, void **data_buf_p, int *data_size_p);
extern int table_delete_first(table_t *table_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern int table_info(table_t *table_p, int *num_buckets_p, int *num_entries_p);
extern int table_adjust(table_t *table_p, const int bucket_n);
extern const char *table_strerror(const int error);
extern int table_type_size(void);
extern int table_first(table_t *table_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern int table_next(table_t *table_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern int table_this(table_t *table_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern int table_first_r(table_t *table_p, table_linear_t *linear_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern int table_next_r(table_t *table_p, table_linear_t *linear_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern int table_this_r(table_t *table_p, table_linear_t *linear_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
extern table_entry_t **table_order(table_t *table_p, table_compare_t compare, int *num_entries_p, int *error_p);
extern int table_entry_info(table_t *table_p, table_entry_t *entry_p, void **key_buf_p, int *key_size_p, void **data_buf_p, int *data_size_p);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __SSL_UTIL_TABLE_H__ */
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