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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup net
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Character string to integer map.
  35.  */
  36.  
  37. #ifndef __CHAR_MAP_H__
  38. #define __CHAR_MAP_H__
  39.  
  40. /** Invalid assigned value used also if an entry does not exist.
  41.  */
  42. #define CHAR_MAP_NULL   ( -1 )
  43.  
  44. /** Type definition of the character string to integer map.
  45.  *  @see char_map
  46.  */
  47. typedef struct char_map char_map_t;
  48.  
  49. /** Type definition of the character string to integer map pointer.
  50.  *  @see char_map
  51.  */
  52. typedef char_map_t *    char_map_ref;
  53.  
  54. /** Character string to integer map item.
  55.  *  This structure recursivelly contains itself as a character by character tree.
  56.  *  The actually mapped character string consists o fall the parent characters and the actual one.
  57.  */
  58. struct  char_map{
  59.     /** Actually mapped character.
  60.      */
  61.     char            c;
  62.     /** Stored integral value.
  63.      */
  64.     int             value;
  65.     /** Next character array size.
  66.      */
  67.     int             size;
  68.     /** First free position in the next character array.
  69.      */
  70.     int             next;
  71.     /** Next character array.
  72.      */
  73.     char_map_ref *  items;
  74.     /** Consistency check magic value.
  75.      */
  76.     int             magic;
  77. };
  78.  
  79. /** Adds the value with the key to the map.
  80.  *  @param map The character string to integer map. Input/output parameter.
  81.  *  @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.
  82.  *  @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.
  83.  *  @param value The integral value to be stored for the key character string. Input parameter.
  84.  *  @returns EOK on success.
  85.  *  @returns EINVAL if the map is not valid.
  86.  *  @returns EINVAL if the identifier parameter is NULL.
  87.  *  @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.
  88.  *  @returns EEXIST if the key character string is already used.
  89.  *  @returns Other error codes as defined for the char_map_add_item() function.
  90.  */
  91. int char_map_add( char_map_ref map, const char * identifier, size_t length, const int value );
  92.  
  93. /** Clears and destroys the map.
  94.  *  @param map The character string to integer map. Input/output parameter.
  95.  */
  96. void    char_map_destroy( char_map_ref map );
  97.  
  98. /** Excludes the value assigned to the key from the map.
  99.  *  The entry is cleared from the map.
  100.  *  @param map The character string to integer map. Input/output parameter.
  101.  *  @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.
  102.  *  @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.
  103.  *  @returns The integral value assigned to the key character string.
  104.  *  @returns CHAR_MAP_NULL if the key is not assigned a value.
  105.  */
  106. int char_map_exclude( char_map_ref map, const char * identifier, size_t length );
  107.  
  108. /** Returns the value assigned to the key from the map.
  109.  *  @param map The character string to integer map. Input parameter.
  110.  *  @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.
  111.  *  @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.
  112.  *  @returns The integral value assigned to the key character string.
  113.  *  @returns CHAR_MAP_NULL if the key is not assigned a value.
  114.  */
  115. int char_map_find( const char_map_ref map, const char * identifier, size_t length );
  116.  
  117. /** Returns the value assigned to the map.
  118.  *  @param map The character string to integer map. Input parameter.
  119.  *  @returns The integral value assigned to the map.
  120.  *  @returns CHAR_MAP_NULL if the map is not assigned a value.
  121.  */
  122. int char_map_get_value( const char_map_ref map );
  123.  
  124. /** Initializes the map.
  125.  *  @param map The character string to integer map. Input/output parameter.
  126.  *  @returns EOK on success.
  127.  *  @returns EINVAL if the map parameter is NULL.
  128.  *  @returns ENOMEM if there is not enough memory left.
  129.  */
  130. int char_map_initialize( char_map_ref map );
  131.  
  132. /** Adds or updates the value with the key to the map.
  133.  *  @param map The character string to integer map. Input/output parameter.
  134.  *  @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.
  135.  *  @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.
  136.  *  @param value The integral value to be stored for the key character string. Input parameter.
  137.  *  @returns EOK on success.
  138.  *  @returns EINVAL if the map is not valid.
  139.  *  @returns EINVAL if the identifier parameter is NULL.
  140.  *  @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.
  141.  *  @returns EEXIST if the key character string is already used.
  142.  *  @returns Other error codes as defined for the char_map_add_item() function.
  143.  */
  144. int char_map_update( char_map_ref map, const char * identifier, size_t length, const int value );
  145.  
  146. #endif
  147.  
  148. /** @}
  149.  */
  150.