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    1: #ifndef HEADER_CURL_HASH_H
    2: #define HEADER_CURL_HASH_H
    3: /***************************************************************************
    4:  *                                  _   _ ____  _
    5:  *  Project                     ___| | | |  _ \| |
    6:  *                             / __| | | | |_) | |
    7:  *                            | (__| |_| |  _ <| |___
    8:  *                             \___|\___/|_| \_\_____|
    9:  *
   10:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
   11:  *
   12:  * This software is licensed as described in the file COPYING, which
   13:  * you should have received as part of this distribution. The terms
   14:  * are also available at https://curl.haxx.se/docs/copyright.html.
   15:  *
   16:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   17:  * copies of the Software, and permit persons to whom the Software is
   18:  * furnished to do so, under the terms of the COPYING file.
   19:  *
   20:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   21:  * KIND, either express or implied.
   22:  *
   23:  ***************************************************************************/
   24: 
   25: #include "curl_setup.h"
   26: 
   27: #include <stddef.h>
   28: 
   29: #include "llist.h"
   30: 
   31: /* Hash function prototype */
   32: typedef size_t (*hash_function) (void *key,
   33:                                  size_t key_length,
   34:                                  size_t slots_num);
   35: 
   36: /*
   37:    Comparator function prototype. Compares two keys.
   38: */
   39: typedef size_t (*comp_function) (void *key1,
   40:                                  size_t key1_len,
   41:                                  void *key2,
   42:                                  size_t key2_len);
   43: 
   44: typedef void (*curl_hash_dtor)(void *);
   45: 
   46: struct curl_hash {
   47:   struct curl_llist *table;
   48: 
   49:   /* Hash function to be used for this hash table */
   50:   hash_function hash_func;
   51: 
   52:   /* Comparator function to compare keys */
   53:   comp_function comp_func;
   54:   curl_hash_dtor   dtor;
   55:   int slots;
   56:   size_t size;
   57: };
   58: 
   59: struct curl_hash_element {
   60:   struct curl_llist_element list;
   61:   void   *ptr;
   62:   size_t key_len;
   63:   char   key[1]; /* allocated memory following the struct */
   64: };
   65: 
   66: struct curl_hash_iterator {
   67:   struct curl_hash *hash;
   68:   int slot_index;
   69:   struct curl_llist_element *current_element;
   70: };
   71: 
   72: int Curl_hash_init(struct curl_hash *h,
   73:                    int slots,
   74:                    hash_function hfunc,
   75:                    comp_function comparator,
   76:                    curl_hash_dtor dtor);
   77: 
   78: void *Curl_hash_add(struct curl_hash *h, void *key, size_t key_len, void *p);
   79: int Curl_hash_delete(struct curl_hash *h, void *key, size_t key_len);
   80: void *Curl_hash_pick(struct curl_hash *, void *key, size_t key_len);
   81: void Curl_hash_apply(struct curl_hash *h, void *user,
   82:                      void (*cb)(void *user, void *ptr));
   83: #define Curl_hash_count(h) ((h)->size)
   84: void Curl_hash_destroy(struct curl_hash *h);
   85: void Curl_hash_clean(struct curl_hash *h);
   86: void Curl_hash_clean_with_criterium(struct curl_hash *h, void *user,
   87:                                     int (*comp)(void *, void *));
   88: size_t Curl_hash_str(void *key, size_t key_length, size_t slots_num);
   89: size_t Curl_str_key_compare(void *k1, size_t key1_len, void *k2,
   90:                             size_t key2_len);
   91: void Curl_hash_start_iterate(struct curl_hash *hash,
   92:                              struct curl_hash_iterator *iter);
   93: struct curl_hash_element *
   94: Curl_hash_next_element(struct curl_hash_iterator *iter);
   95: 
   96: void Curl_hash_print(struct curl_hash *h,
   97:                      void (*func)(void *));
   98: 
   99: 
  100: #endif /* HEADER_CURL_HASH_H */