hash.h

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/* $Id: hash.h 4208 2012-07-18 07:52:33Z ming $ */
/* 
 * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
 * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */
#ifndef __PJ_HASH_H__
#define __PJ_HASH_H__

#include <pj/types.h>

PJ_BEGIN_DECL

#define PJ_HASH_KEY_STRING      ((unsigned)-1)

#define PJ_HASH_ENTRY_BUF_SIZE  (3*sizeof(void*) + 2*sizeof(pj_uint32_t))

typedef void *pj_hash_entry_buf[(PJ_HASH_ENTRY_BUF_SIZE+sizeof(void*)-1)/(sizeof(void*))];

PJ_DECL(pj_uint32_t) pj_hash_calc(pj_uint32_t hval, 
                                  const void *key, unsigned keylen);


PJ_DECL(pj_uint32_t) pj_hash_calc_tolower(pj_uint32_t hval,
                                          char *result,
                                          const pj_str_t *key);

PJ_DECL(pj_hash_table_t*) pj_hash_create(pj_pool_t *pool, unsigned size);


PJ_DECL(void *) pj_hash_get( pj_hash_table_t *ht,
                             const void *key, unsigned keylen,
                             pj_uint32_t *hval );


PJ_DECL(void *) pj_hash_get_lower( pj_hash_table_t *ht,
                                   const void *key, unsigned keylen,
                                   pj_uint32_t *hval );


PJ_DECL(void) pj_hash_set( pj_pool_t *pool, pj_hash_table_t *ht,
                           const void *key, unsigned keylen, pj_uint32_t hval,
                           void *value );


PJ_DECL(void) pj_hash_set_lower( pj_pool_t *pool, pj_hash_table_t *ht,
                                 const void *key, unsigned keylen,
                                 pj_uint32_t hval, void *value );


PJ_DECL(void) pj_hash_set_np(pj_hash_table_t *ht,
                             const void *key, unsigned keylen, 
                             pj_uint32_t hval, pj_hash_entry_buf entry_buf, 
                             void *value);

PJ_DECL(void) pj_hash_set_np_lower(pj_hash_table_t *ht,
                                   const void *key, unsigned keylen,
                                   pj_uint32_t hval,
                                   pj_hash_entry_buf entry_buf,
                                   void *value);

PJ_DECL(unsigned) pj_hash_count( pj_hash_table_t *ht );


PJ_DECL(pj_hash_iterator_t*) pj_hash_first( pj_hash_table_t *ht,
                                            pj_hash_iterator_t *it );


PJ_DECL(pj_hash_iterator_t*) pj_hash_next( pj_hash_table_t *ht, 
                                           pj_hash_iterator_t *it );

PJ_DECL(void*) pj_hash_this( pj_hash_table_t *ht,
                             pj_hash_iterator_t *it );


PJ_END_DECL

#endif