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/usr/include/cherokee/avl.h is in libcherokee-base0-dev 1.2.101-1.

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The actual contents of the file can be viewed below.

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
 *
 * Authors:
 *      Alvaro Lopez Ortega <alvaro@alobbs.com>
 *
 * Copyright (C) 2001-2011 Alvaro Lopez Ortega
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#if !defined (CHEROKEE_INSIDE_CHEROKEE_H) && !defined (CHEROKEE_COMPILATION)
# error "Only <cherokee/cherokee.h> can be included directly, this file may disappear or change contents."
#endif

#ifndef CHEROKEE_AVL_H
#define CHEROKEE_AVL_H

#include <cherokee/buffer.h>
#include <cherokee/avl_generic.h>

CHEROKEE_BEGIN_DECLS


/* AVL Tree Node
 */
typedef struct {
	cherokee_avl_generic_node_t base;
	cherokee_buffer_t           key;
} cherokee_avl_node_t;

/* AVL Tree
 */
typedef struct {
	cherokee_avl_generic_t base;
	cherokee_boolean_t     case_insensitive;
} cherokee_avl_t;


#define AVL(a) ((cherokee_avl_t *)(a))
#define AVL_NODE(a) ((cherokee_avl_node_t *)(a))


ret_t cherokee_avl_init     (cherokee_avl_t  *avl);
ret_t cherokee_avl_new      (cherokee_avl_t **avl);
ret_t cherokee_avl_set_case (cherokee_avl_t  *avl, cherokee_boolean_t case_insensitive);

ret_t cherokee_avl_add     (cherokee_avl_t *avl, cherokee_buffer_t *key, void  *value);
ret_t cherokee_avl_del     (cherokee_avl_t *avl, cherokee_buffer_t *key, void **value);
ret_t cherokee_avl_get     (cherokee_avl_t *avl, cherokee_buffer_t *key, void **value);

ret_t cherokee_avl_add_ptr (cherokee_avl_t *avl, const char *key, void  *value);
ret_t cherokee_avl_del_ptr (cherokee_avl_t *avl, const char *key, void **value);
ret_t cherokee_avl_get_ptr (cherokee_avl_t *avl, const char *key, void **value);


typedef ret_t (* cherokee_avl_while_func_t) (cherokee_buffer_t *key, void *value, void *param);

ret_t cherokee_avl_while (cherokee_avl_generic_t       *avl,
			  cherokee_avl_while_func_t     func,
			  void                         *param,
			  cherokee_buffer_t           **key,
			  void                        **value);


CHEROKEE_END_DECLS

#endif /* CHEROKEE_AVL_H */