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/*
 * Copyright (c) 2008 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup net
 * @{
 */

/** @file
 *  A character string to integer map header file.
 */

#ifndef __CHAR_MAP_H__
#define __CHAR_MAP_H__

/** An invalid assigned value used also if an entry does not exist.
 */
#define CHAR_MAP_NULL   ( -1 )

/** A type definition of a character string to integer map.
 *  @see char_map
 */
typedef struct char_map char_map_t;

/** A type definition of a character string to integer map pointer.
 *  @see char_map
 */
typedef char_map_t *    char_map_ref;

/** A character string to integer map item.
 *  This structure recursivelly contains itself as a character by character tree.
 *  The actually mapped character string consists o fall the parent characters and the actual one.
 */
struct  char_map{

    /** An actually mapped character.
     */
    char            c;

    /** A stored integral value.
     */
    int             value;

    /** A next character array size.
     */
    int             size;

    /** The first free position in the next character array.
     */
    int             next;

    /** The next character array.
     */
    char_map_ref *  items;

    /** The consistency check magic value.
     */
    int             magic;
};

/** Adds the value with the key to the map.
 *  @param map The character string to integer map. Input/output parameter.
 *  @param identifier The key zero ('\0') terminated character string. The key character string is processed until the first terminating zero ('\0') character after the given length is found. Input parameter.
 *  @param length The key character string length. The parameter may be zero (0) which means that the string is processed until the terminating zero ('\0') character is found. Input parameter.
 *  @param value The integral value to be stored for the key character string. Input parameter.
 *  @returns EOK on success.
 *  @returns EINVAL if the map is not valid.
 *  @returns EINVAL if the identifier parameter is NULL.
 *  @returns EINVAL if the length parameter zero (0) and the identifier parameter is an empty character string (the first character is the terminating zero ('\0) character.
 *  @returns EEXIST if the key character string is already used.
 *  @returns Other error codes as defined for the char_map_add_item() function.
 */
int char_map_add( char_map_ref map, const char * identifier, size_t length, const int value );

/** Clears and destroys the map.
 *  @param map The character string to integer map. Input/output parameter.
 */
void    char_map_destroy( char_map_ref map );

/** Excludes the value assigned to the key from the map.
 *  The entry is cleared from the map.
 *  @param map The character string to integer map. Input/output parameter.
 *  @param identifier The key zero ('\0') terminated character string. The key character string is processed until the first terminating zero ('\0') character after the given length is found. Input parameter.
 *  @param length The key character string length. The parameter may be zero (0) which means that the string is processed until the terminating zero ('\0') character is found. Input parameter.
 *  @returns The integral value assigned to the key character string.
 *  @returns CHAR_MAP_NULL if the key is not assigned a value.
 */
int char_map_exclude( char_map_ref map, const char * identifier, size_t length );

/** Returns the value assigned to the key from the map.
 *  @param map The character string to integer map. Input parameter.
 *  @param identifier The key zero ('\0') terminated character string. The key character string is processed until the first terminating zero ('\0') character after the given length is found. Input parameter.
 *  @param length The key character string length. The parameter may be zero (0) which means that the string is processed until the terminating zero ('\0') character is found. Input parameter.
 *  @returns The integral value assigned to the key character string.
 *  @returns CHAR_MAP_NULL if the key is not assigned a value.
 */
int char_map_find( const char_map_ref map, const char * identifier, size_t length );

/** Returns the value assigned to the map.
 *  @param map The character string to integer map. Input parameter.
 *  @returns The integral value assigned to the map.
 *  @returns CHAR_MAP_NULL if the map is not assigned a value.
 */
int char_map_get_value( const char_map_ref map );

/** Initializes the map.
 *  @param map The character string to integer map. Input/output parameter.
 *  @returns EOK on success.
 *  @returns EINVAL if the map parameter is NULL.
 *  @returns ENOMEM if there is no memory left.
 */
int char_map_initialize( char_map_ref map );

/** Adds or updates the value with the key to the map.
 *  @param map The character string to integer map. Input/output parameter.
 *  @param identifier The key zero ('\0') terminated character string. The key character string is processed until the first terminating zero ('\0') character after the given length is found. Input parameter.
 *  @param length The key character string length. The parameter may be zero (0) which means that the string is processed until the terminating zero ('\0') character is found. Input parameter.
 *  @param value The integral value to be stored for the key character string. Input parameter.
 *  @returns EOK on success.
 *  @returns EINVAL if the map is not valid.
 *  @returns EINVAL if the identifier parameter is NULL.
 *  @returns EINVAL if the length parameter zero (0) and the identifier parameter is an empty character string (the first character is the terminating zero ('\0) character.
 *  @returns EEXIST if the key character string is already used.
 *  @returns Other error codes as defined for the char_map_add_item() function.
 */
int char_map_update( char_map_ref map, const char * identifier, size_t length, const int value );

#endif

/** @}
 */