1190 lines
44 KiB
C
1190 lines
44 KiB
C
/* EINA - EFL data type library
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* Copyright (C) 2002-2008 Carsten Haitzler, Gustavo Sverzut Barbieri,
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* Vincent Torri, Jorge Luis Zapata Muga, Cedric Bail
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EINA_HASH_H_
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#define EINA_HASH_H_
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#include "eina_types.h"
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#include "eina_iterator.h"
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/**
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* @page hash_01_example_page Eina_Hash in action
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* @dontinclude eina_hash_01.c
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*
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* We are going to store some tuples into our table, that will map each @a name
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* to a @a number. The cost to access a given number from the name should be
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* very small, even with many entries in our table. This is the initial data:
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* @skip _Phone_Entry
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* @until // _start_entries
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*
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* Before starting to play with the hash, let's write a callback that will be
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* used to free the elements from it. Since we are just storing strduped
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* strings, we just need to free them:
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*
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* @skip static
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* @until }
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*
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* We also need a callback to iterate over the elements of the list later, so
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* we are defining it now:
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*
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* @skip Eina_Bool
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* @until }
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*
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* Now let's create our @ref Eina_Hash using @ref
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* eina_hash_string_superfast_new :
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*
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* @skip eina_init
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* @until phone_book
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*
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* Now we add the keys and data to the hash using @ref eina_hash_add . This
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* means that the key is copied inside the table, together with the pointer to
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* the data (phone numbers).
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*
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* @skip for
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* @until }
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*
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* Some basic manipulations with the hash, like finding a value given a key,
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* deleting an entry, modifying an entry are exemplified in the following lines.
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* Notice that the @ref eina_hash_modify function returns the old value stored
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* in that entry, and it needs to be freed, while the @ref eina_hash_del
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* function already calls our free callback:
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*
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* @skip Look for
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* @until free(
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*
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* The @ref eina_hash_set function can be used to set a key-value entry to the
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* table if it doesn't exist, or to modify an existent entry. It returns the old
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* entry if it was already set, and NULL otherwise. But since it will
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* return NULL on error too, we need to check if an error has occurred:
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*
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* @skip Modify
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* @until printf("\n");
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*
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* There are different ways of iterate over the entries of a hash. Here we show
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* two of them: using @ref eina_hash_foreach and @ref Eina_Iterator.
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*
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* @skip List of phones
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* @until eina_iterator_free(it);
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*
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* It's also possible to change the key for a specific entry, without having to
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* remove the entry from the table and adding it again:
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*
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* @skipline eina_hash_move
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*
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* We can remove all the elements from the table without free the table itself:
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*
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* @skip Empty the phone book
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* @until eina_hash_population
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*
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* Or free the the entire table with its content:
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*
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* @skipline eina_hash_free
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*
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*
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* The full code for this example can be seen here: @ref eina_hash_01_c
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*/
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/**
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* @page eina_hash_01_c Hash table in action
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*
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* @include eina_hash_01.c
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* @example eina_hash_01.c
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*/
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/**
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* @page hash_02_example_page Different types of tables
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*
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* This example shows two more types of hash tables that can be created using
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* @ref Eina_Hash . For more types, consult the reference documentation of @ref
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* eina_hash_new.
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* @include eina_hash_02.c
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* @example eina_hash_02.c
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*/
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/**
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* @example eina_hash_03.c
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* Same example as @ref hash_01_example_page but using a "string small" hash
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* table instead of "string superfast".
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*/
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/**
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* @example eina_hash_04.c
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* Same example as @ref hash_01_example_page but using a "string djb2" hash
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* table instead of "string superfast".
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*/
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/**
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* @example eina_hash_05.c
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* Same example as @ref hash_01_example_page but using a "int32" hash
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* table instead of "string superfast".
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*/
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/**
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* @example eina_hash_06.c
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* Same example as @ref hash_01_example_page but using a "int64" hash
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* table instead of "string superfast".
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*/
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/**
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* @example eina_hash_07.c
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* Same example as @ref hash_01_example_page but using a "pointer" hash
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* table instead of "string superfast".
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*/
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/**
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* @example eina_hash_08.c
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* This example shows the the usage of eina_hash_add(), eina_hash_add_by_hash(),
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* eina_hash_direct_add_by_hash(), eina_hash_del(), eina_hash_del_by_key_hash(),
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* eina_hash_del_by_key(), eina_hash_del_by_data(), eina_hash_find_by_hash() and
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* eina_hash_modify_by_hash().
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*/
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/**
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* @addtogroup Eina_Hash_Group Hash Table
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*
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* @brief Hash table management. Maps keys to values.
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*
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* The hash table associates keys (e.g. strings) to data, with
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* relatively fast access time. The performance is proportional to the
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* load factor of the table (number of elements / number of
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* buckets). See @ref hashtable_algo for implementation details.
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*
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* There are optimized implementations for some common key types, such
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* as strings, integers, pointers, and stringshared; custom optimizations
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* are also permitted.
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*
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* The hash table keys can be either copied or non-copied, using
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* eina_hash_add() or eina_hash_direct_add(), respectively.
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*
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* @section hashtable_algo Algorithm
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*
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* The Eina_Hash is implemented using an array of N "buckets", where each
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* bucket is a pointer to a structure that is the head of a <a
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* href="http://en.wikipedia.org/wiki/Red-black_tree">red-black tree</a>. The
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* array can then be indexed by the [hash_of_element mod N]. The
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* hash_of_element is calculated using the hashing function, passed as a
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* parameter to the @ref eina_hash_new function. N is the number of buckets
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* (array positions), and is calculated based on the buckets_power_size
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* (argument of @ref eina_hash_new too). The following picture illustrates the
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* basic idea:
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*
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* @htmlonly
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* <img src="01_hash-table.png" width="500" />
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* @endhtmlonly
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* @image latex 01_hash-table.eps
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*
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* Adding an element to the hash table involves the following steps:
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* @li calculate the hash for that key (using the specified hash function);
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* @li calculate the array position [hash mod N];
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* @li add the element to the rbtree on that position.
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*
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* The first two steps have constant time, proportional to the hash function
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* being used. Adding the key to the rbtree will be proportional to the number
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* of keys in that bucket.
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*
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* The average lookup cost depends on the number of keys per bucket
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* (load factor) of the table, assuming the distribution of keys is
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* sufficiently uniform.
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*
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* @section hashtable_perf Performance
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*
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* Keeping the load factor small will improve the hash table performance. But
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* increasing the buckets_power_size will also increase the memory consumption.
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* The default hash table creation functions provides enough
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* buckets for most cases. If just a few string keys
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* (less than 30) will be added to the hash table, @ref
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* eina_hash_string_small_new should be used, since it reduces the memory
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* consumption for the buckets without causing too many collisions.
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* However, @ref eina_hash_string_small_new still uses the same hash calculation
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* function that @ref eina_hash_string_superfast_new, which is more complex than
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* @ref eina_hash_string_djb2_new. The latter has a faster hash computation
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* function, but that will imply a not so good distribution. But if just a
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* few keys are being added, this is not a problem, it will still have not many
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* collisions and be faster to calculate the hash than in a hash created with
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* @ref eina_hash_string_small_new and @ref eina_hash_string_superfast_new.
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*
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* A simple comparison between them would be:
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*
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* @li @c djb2 - faster hash function - 256 buckets (higher memory consumption)
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* @li @c string_small - slower hash function but less collisions - 32 buckets
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* (lower memory consumption)
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* @li @c string_superfast - slower hash function but less collisions - 256 buckets
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* (higher memory consumption) - not randomized, avoid it on public remote interface.
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*
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* Basically for a very small number of keys (10 or less), @c djb2 should be
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* used, or @c string_small if you have a restriction on memory usage. And for a
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* higher number of keys, @c string_superfast should be preferred if not used on a
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* public remote interface.
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*
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* If just stringshared keys are being added, use @ref
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* eina_hash_stringshared_new. If a lot of keys will be added to the hash table
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* (e.g. more than 1000), then it's better to increase the buckets_power_size.
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* See @ref eina_hash_new for more details.
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*
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* When adding a new key to a hash table, use @ref eina_hash_add or @ref
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* eina_hash_direct_add (the latter if this key is already stored elsewhere). If
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* the key may be already inside the hash table, rather than checking with
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* @ref eina_hash_find followed by @ref eina_hash_add, one can use just @ref
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* eina_hash_set (this will change the data pointed by this key if it was
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* already present in the table).
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*
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* @section hashtable_tutorial Tutorial
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*
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* These examples show many Eina_Hash functions in action:
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* <ul>
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* <li> @ref hash_01_example_page
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* <li> @ref hash_02_example_page
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* <li> Different types of hash in use:
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* <ul>
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* <li> @ref eina_hash_03.c "string small"
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* <li> @ref eina_hash_04.c "string djb2"
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* <li> @ref eina_hash_05.c "int32"
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* <li> @ref eina_hash_06.c "int64"
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* <li> @ref eina_hash_07.c "pointer"
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* </ul>
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* <li> @ref eina_hash_08.c "Different add and delete functions"
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* </ul>
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*/
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/**
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* @addtogroup Eina_Data_Types_Group Data Types
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*
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* @{
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*/
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/**
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* @addtogroup Eina_Containers_Group Containers
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*
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* @{
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*/
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/**
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* @defgroup Eina_Hash_Group Hash Table
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*
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* @{
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*/
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/**
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* @typedef Eina_Hash
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* Type for a generic hash table.
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*/
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typedef struct _Eina_Hash Eina_Hash;
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/**
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* @typedef Eina_Hash_Tuple
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* Type for a hash table of key/value pairs.
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*/
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typedef struct _Eina_Hash_Tuple Eina_Hash_Tuple;
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/**
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* @struct _Eina_Hash_Tuple
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* Data for a hash table of key/value pairs.
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*/
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struct _Eina_Hash_Tuple
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{
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const void *key; /**< The key */
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void *data; /**< The data associated to the key */
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unsigned int key_length; /**< The length of the key */
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};
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/**
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* @typedef Eina_Key_Length
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* Type for a function to determine the length of a hash key.
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*/
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typedef unsigned int (*Eina_Key_Length)(const void *key);
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/**
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* @def EINA_KEY_LENGTH
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* @param[in] Function The function used to calculate length of hash key.
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*/
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#define EINA_KEY_LENGTH(Function) ((Eina_Key_Length)Function)
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/**
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* @typedef Eina_Key_Cmp
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* Type for a function to compare two hash keys.
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*/
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typedef int (*Eina_Key_Cmp)(const void *key1, int key1_length, const void *key2, int key2_length);
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/**
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* @def EINA_KEY_CMP
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* @param[in]Function The function used to compare hash key.
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*/
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#define EINA_KEY_CMP(Function) ((Eina_Key_Cmp)Function)
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/**
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* @typedef Eina_Key_Hash
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* Type for a function to create a hash key.
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*/
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typedef int (*Eina_Key_Hash)(const void *key, int key_length);
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/**
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* @def EINA_KEY_HASH
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* @param[in] Function The function used to hash key.
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*/
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#define EINA_KEY_HASH(Function) ((Eina_Key_Hash)Function)
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/**
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* @typedef Eina_Hash_Foreach
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* Type for a function to iterate over a hash table.
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*/
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typedef Eina_Bool (*Eina_Hash_Foreach)(const Eina_Hash *hash, const void *key, void *data, void *fdata);
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/**
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* @brief Creates a new hash table.
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*
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* @param[in] key_length_cb The function called when getting the size of the key.
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* @param[in] key_cmp_cb The function called when comparing the keys.
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* @param[in] key_hash_cb The function called when getting the values.
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* @param[in] data_free_cb The function called on each value when the hash table is
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* freed, or when an item is deleted from it. @c NULL can be passed as a
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* callback.
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* @param[in] buckets_power_size The size of the buckets.
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* @return The new hash table, or @c NULL on failure.
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*
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* This function creates a new hash table using user-defined callbacks
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* to manage the hash table.
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* If @p key_cmp_cb or @p key_hash_cb
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* are @c NULL, @c NULL is returned. If @p buckets_power_size is
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* smaller or equal than 2, or if it is greater or equal than 17,
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* @c NULL is returned.
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*
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* The number of buckets created will be 2 ^ @p buckets_power_size. This means
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* that if @p buckets_power_size is 5, there will be created 32 buckets, whereas for a
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* @p buckets_power_size of 8, there will be 256 buckets.
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*
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* Pre-defined functions are available to create a hash table. See
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* eina_hash_string_djb2_new(), eina_hash_string_superfast_new(),
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* eina_hash_string_small_new(), eina_hash_int32_new(),
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* eina_hash_int64_new(), eina_hash_pointer_new() and
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* eina_hash_stringshared_new().
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*/
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EAPI Eina_Hash *eina_hash_new(Eina_Key_Length key_length_cb,
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Eina_Key_Cmp key_cmp_cb,
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Eina_Key_Hash key_hash_cb,
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Eina_Free_Cb data_free_cb,
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int buckets_power_size) EINA_MALLOC EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(2, 3);
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/**
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* @brief Sets the data cleanup callback for a hash.
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*
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* @param[in,out] hash The given hash table.
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* @param[in] data_free_cb The function called on each value when the hash
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* table is freed, or when an item is deleted from it. @c NULL can be passed as
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* callback to remove an existing callback.
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*
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* The argument received by @p data_free_cb will be the data of the item being
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* removed.
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*
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* @since 1.1
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* @see eina_hash_new.
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*/
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EAPI void eina_hash_free_cb_set(Eina_Hash *hash, Eina_Free_Cb data_free_cb) EINA_ARG_NONNULL(1);
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/**
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* @brief Creates a new hash table using the djb2 algorithm.
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*
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* @param[in] data_free_cb The function called on each value when the hash table
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* is freed, or when an item is deleted from it. @c NULL can be passed as
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* callback.
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* @return The new hash table, or @c NULL on failure.
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*
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* This function creates a new hash table using the djb2 algorithm for
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* table management and strcmp() to compare the keys. Values can then
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* be looked up with pointers other than the original key pointer that
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* was used to add values.
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*/
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EAPI Eina_Hash *eina_hash_string_djb2_new(Eina_Free_Cb data_free_cb);
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/**
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* @brief Creates a new hash table for use with strings.
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*
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* @param[in] data_free_cb The function called on each value when the hash table
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* is freed, or when an item is deleted from it. @c NULL can be passed as
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* callback.
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* @return The new hash table, or @c NULL on failure.
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*
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* This function creates a new hash table using the superfast algorithm
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* for table management and strcmp() to compare the keys. Values can
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* then be looked up with pointers other than the original key pointer
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* that was used to add values.
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*
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* @warning Don't use this kind of hash when there is a possibility to
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* remotely request and push data in it. This hash is subject to denial
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* of service.
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*/
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EAPI Eina_Hash *eina_hash_string_superfast_new(Eina_Free_Cb data_free_cb);
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/**
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* @brief Creates a new hash table for use with strings with small bucket size.
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*
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* @param[in] data_free_cb The function called on each value when the hash table
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* is freed, or when an item is deleted from it. @c NULL can be passed as
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* callback.
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* @return The new hash table, or @c NULL on failure.
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*
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* This function creates a new hash table using the superfast algorithm
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* for table management and strcmp() to compare the keys, but with a
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* smaller bucket size (compared to eina_hash_string_superfast_new())
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* which will minimize the memory used by the returned hash
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* table. Values can then be looked up with pointers other than the
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* original key pointer that was used to add values.
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*/
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EAPI Eina_Hash *eina_hash_string_small_new(Eina_Free_Cb data_free_cb);
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/**
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* @brief Creates a new hash table for use with 32bit integers.
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*
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* @param[in] data_free_cb The function called on each value when the hash table
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* is freed, or when an item is deleted from it. @c NULL can be passed as
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* callback.
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* @return The new hash table, or @c NULL on failure.
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*
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* This function creates a new hash table where keys are 32bit integers.
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* When adding or looking up in the hash table, pointers to 32bit integers
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* must be passed. They can be addresses on the stack if you let the
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* eina_hash copy the key. Values can then
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* be looked up with pointers other than the original key pointer that was
|
|
* used to add values. This method is not suitable to match string keys as
|
|
* it would only match the first character.
|
|
*/
|
|
EAPI Eina_Hash *eina_hash_int32_new(Eina_Free_Cb data_free_cb);
|
|
|
|
/**
|
|
* @brief Creates a new hash table for use with 64bit integers.
|
|
*
|
|
* @param[in] data_free_cb The function called on each value when the hash table
|
|
* is freed, or when an item is deleted from it. @c NULL can be passed as
|
|
* callback.
|
|
* @return The new hash table, or @c NULL on failure.
|
|
*
|
|
* This function creates a new hash table where keys are 64bit integers.
|
|
* When adding or looking up in the hash table, pointers to 64bit integers
|
|
* must be passed. They can be addresses on the stack. Values can then
|
|
* be looked up with pointers other than the original key pointer that was
|
|
* used to add values. This method is not suitable to match string keys as
|
|
* it would only match the first character.
|
|
*/
|
|
EAPI Eina_Hash *eina_hash_int64_new(Eina_Free_Cb data_free_cb);
|
|
|
|
/**
|
|
* @brief Creates a new hash table for use with pointers.
|
|
*
|
|
* @param[in] data_free_cb The function called on each value when the hash table
|
|
* is freed, or when an item is deleted from it. @c NULL can be passed as
|
|
* callback.
|
|
* @return The new hash table, or @c NULL on failure.
|
|
*
|
|
* This function creates a new hash table using the int64/int32 algorithm for
|
|
* table management and dereferenced pointers to compare the
|
|
* keys. Values can then be looked up with pointers other than the
|
|
* original key pointer that was used to add values. This method may
|
|
* appear to be able to match string keys, but actually it only matches
|
|
* the first character.
|
|
*
|
|
* @code
|
|
* // For a hash that will have only one pointer to each structure
|
|
* extern Eina_Hash *hash;
|
|
* extern void *data;
|
|
*
|
|
* if (!eina_hash_find(hash, &data))
|
|
* eina_hash_add(hash, &data, data);
|
|
* @endcode
|
|
*/
|
|
EAPI Eina_Hash *eina_hash_pointer_new(Eina_Free_Cb data_free_cb);
|
|
|
|
/**
|
|
* @brief Creates a new hash table optimized for stringshared values.
|
|
*
|
|
* @param[in] data_free_cb The function called on each value when the hash table
|
|
* is freed, or when an item is deleted from it. @c NULL can be passed as
|
|
* callback.
|
|
* @return The new hash table, or @c NULL on failure.
|
|
*
|
|
* This function creates a new hash table optimized for stringshared
|
|
* values. Values CANNOT be looked up with pointers not
|
|
* equal to the original key pointer that was used to add a value.
|
|
*
|
|
* Excerpt of code that will NOT work with this type of hash:
|
|
*
|
|
* @code
|
|
* extern Eina_Hash *hash;
|
|
* extern const char *value;
|
|
* const char *a = eina_stringshare_add("key");
|
|
*
|
|
* eina_hash_add(hash, a, value);
|
|
* eina_hash_find(hash, "key");
|
|
* @endcode
|
|
*/
|
|
EAPI Eina_Hash *eina_hash_stringshared_new(Eina_Free_Cb data_free_cb);
|
|
|
|
/**
|
|
* @brief Adds an entry to the given hash table.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key A unique key. Cannot be @c NULL.
|
|
* @param[in] data The data to associate with the string given by @p key. Cannot be @c
|
|
* NULL.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function adds @p key to @p hash. @p key must be unique within
|
|
* the hash table so that @ref eina_hash_find() and @ref eina_hash_del()
|
|
* operate on the correct data item.
|
|
*
|
|
* Key uniqueness varies depending on the type of @p hash: a
|
|
* stringshared @ref Eina_Hash needs unique pointers (which implies
|
|
* unique strings). All other string hash types require that the
|
|
* strings themselves are unique. Pointer, int32 and int64 hashes need
|
|
* to have unique values. Failure to use sufficient uniqueness will
|
|
* result in unexpected results when inserting data pointers accessed
|
|
* with @ref eina_hash_find(), and removed with @ref eina_hash_del().
|
|
*
|
|
* Key strings are case sensitive.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_add(Eina_Hash *hash,
|
|
const void *key,
|
|
const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Adds an entry to the given hash table without duplicating the string.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key A unique key. Cannot be @c NULL.
|
|
* @param[in] data The data to associate with the string given by @p
|
|
* key. Cannot be @c NULL
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function adds @p key to @p hash. @p key must be unique within
|
|
* the hash table so that @ref eina_hash_find() and @ref eina_hash_del()
|
|
* operate on the correct data item.
|
|
*
|
|
* Key uniqueness varies depending on the type of @p hash: a
|
|
* stringshared @ref Eina_Hash needs unique pointers (which implies
|
|
* unique strings). All other string hash types require that the
|
|
* strings themselves are unique. Pointer, int32 and int64 hashes need
|
|
* to have unique values. Failure to use sufficient uniqueness will
|
|
* result in unexpected results when inserting data pointers accessed
|
|
* with @ref eina_hash_find(), and removed with @ref eina_hash_del().
|
|
*
|
|
* Unlike @ref eina_hash_add(), this function does not make a copy of
|
|
* @p key, so it must be a string constant or stored elsewhere (such as
|
|
* in the object being added). Key strings are case sensitive.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_direct_add(Eina_Hash *hash,
|
|
const void *key,
|
|
const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Removes the entry identified by a key or a data from the given
|
|
* hash table.
|
|
*
|
|
* @param[in,out] hash The given hash table.
|
|
* @param[in] key The key.
|
|
* @param[in] data The data pointer to remove if the key is @c NULL.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function removes the entry identified by @p key or @p data
|
|
* from @p hash. If a free function was given to the
|
|
* callback on creation, it will be called for the data being
|
|
* deleted. If @p hash is @c NULL, the function returns immediately #EINA_FALSE.
|
|
* If @p key is @c NULL, then @p data is used to find the a
|
|
* match to remove, otherwise @p key is used and @p data is not
|
|
* required and can be @c NULL.
|
|
*
|
|
* @note If you already have the key, use eina_hash_del_by_key() or
|
|
* eina_hash_del_by_key_hash(). If you don't have the key, use
|
|
* eina_hash_del_by_data() directly.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_del(Eina_Hash *hash,
|
|
const void *key,
|
|
const void *data) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief Retrieves a specific entry in the given hash table.
|
|
*
|
|
* @param[in] hash The given hash table.
|
|
* @param[in] key The key of the entry to find.
|
|
* @return The data pointer for the stored entry on success, or @c NULL
|
|
* otherwise.
|
|
*
|
|
* This function retrieves the entry associated with @p key in
|
|
* @p hash. If @p hash is @c NULL, this function returns @c NULL.
|
|
*/
|
|
EAPI void *eina_hash_find(const Eina_Hash *hash,
|
|
const void *key) EINA_ARG_NONNULL(2);
|
|
|
|
/**
|
|
* @brief Modifies the entry pointer at the specified key and returns
|
|
* the previous entry.
|
|
* @param[in,out] hash The given hash table.
|
|
* @param[in] key The key of the entry to modify.
|
|
* @param[in] data The new data.
|
|
* @return The data pointer for the previously stored entry on success,
|
|
* or @c NULL otherwise.
|
|
*
|
|
* This function modifies the data of @p key with @p data in @p
|
|
* hash. If no entry is found, nothing is added to @p hash.
|
|
*/
|
|
EAPI void *eina_hash_modify(Eina_Hash *hash,
|
|
const void *key,
|
|
const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Modifies the entry pointer at the specified key and returns the
|
|
* previous entry or adds the entry if not found.
|
|
*
|
|
* @param[in,out] hash The given hash table.
|
|
* @param[in] key The key of the entry to modify.
|
|
* @param[in] data The data to replace the previous entry.
|
|
* @return The data pointer for the previous stored entry, or @c NULL
|
|
* otherwise.
|
|
*
|
|
* This function modifies the value of @p key to @p data in @p
|
|
* hash. If no entry is found, @p data is added to @p hash with the
|
|
* key @p key.
|
|
*/
|
|
EAPI void *eina_hash_set(Eina_Hash *hash,
|
|
const void *key,
|
|
const void *data) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @brief Changes the key of an entry in a hash without triggering the
|
|
* free callback.
|
|
*
|
|
* @param[in,out] hash The given hash table.
|
|
* @param[in] old_key The current key associated with the data.
|
|
* @param[in] new_key The new key to associate data with.
|
|
* @return #EINA_FALSE in any case but success, #EINA_TRUE on success.
|
|
*
|
|
* This function moves data from one key to another,
|
|
* but does not call the Eina_Free_Cb associated with the hash table
|
|
* when destroying the old key.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_move(Eina_Hash *hash,
|
|
const void *old_key,
|
|
const void *new_key) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Frees the given hash table's resources.
|
|
*
|
|
* @param[in] hash The hash table to be freed.
|
|
*
|
|
* This function frees memory allocated for the @p hash and to its
|
|
* internal buckets.
|
|
*
|
|
* If @p data_free_cb was specified at creation time in
|
|
* @ref eina_hash_new, it will be called for each element as it gets
|
|
* freed. If the callback was not specified, then any data in these
|
|
* elements may now be lost, if not stored or freed elsewhere.
|
|
*
|
|
* If @p hash is @c NULL, the function returns immediately.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* extern Eina_Hash *hash;
|
|
*
|
|
* eina_hash_free(hash);
|
|
* hash = NULL;
|
|
* @endcode
|
|
*/
|
|
EAPI void eina_hash_free(Eina_Hash *hash) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief Frees the given hash table buckets resources.
|
|
*
|
|
* @param[in] hash The hash table whose buckets have to be freed.
|
|
*
|
|
* This function frees memory allocated to internal buckets for @p hash.
|
|
*
|
|
* If @p data_free_cb was specified at creation time in
|
|
* @ref eina_hash_new(), it will be called for each element as it gets
|
|
* freed. If the callback was not specified, then any data in these
|
|
* elements may now be lost, if not stored or freed elsewhere.
|
|
*
|
|
* If @p hash is @c NULL, the function returns immediately.
|
|
*/
|
|
EAPI void eina_hash_free_buckets(Eina_Hash *hash) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief Returns the number of entries in the given hash table.
|
|
*
|
|
* @param[in] hash The given hash table.
|
|
* @return The number of entries in the hash table, or @c 0 on error or
|
|
* if @p hash is @c NULL.
|
|
*/
|
|
EAPI int eina_hash_population(const Eina_Hash *hash) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief Adds an entry to the given hash table by its key hash.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key A unique key. Cannot be @c NULL.
|
|
* @param[in] key_length The length of @p key (including terminating '\\0').
|
|
* @param[in] key_hash The hash of @p key.
|
|
* @param[in] data The data to associate with the string given by the key. Cannot be
|
|
* @c NULL.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function adds @p key to @p hash.
|
|
*
|
|
* @p key must be unique within the hash table so that
|
|
* @ref eina_hash_find() and @ref eina_hash_del() operate on the correct
|
|
* data item. @p key_hash must match @p key so that the correct item can
|
|
* be found by @ref eina_hash_find_by_hash(). Key strings are case
|
|
* sensitive.
|
|
*
|
|
* @see eina_hash_add()
|
|
*/
|
|
EAPI Eina_Bool eina_hash_add_by_hash(Eina_Hash *hash,
|
|
const void *key,
|
|
int key_length,
|
|
int key_hash,
|
|
const void *data) EINA_ARG_NONNULL(1, 2, 5);
|
|
|
|
/**
|
|
* @brief Adds an entry to a hash table by its key hash without duplicating the string key.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key A unique key. Cannot be @c NULL.
|
|
* @param[in] key_length The length of @p key (including terminating '\\0').
|
|
* @param[in] key_hash The hash of @p key.
|
|
* @param[in] data The data to associate with the string given by @p key. Cannot be @c
|
|
* NULL.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function adds @p key to @p hash.
|
|
*
|
|
* @p key must be unique within the hash table so that
|
|
* @ref eina_hash_find() and @ref eina_hash_del() operate on the correct
|
|
* data item. @p key_hash must match @p key so that the correct item can
|
|
* be found by @ref eina_hash_find_by_hash(). Key strings are case
|
|
* sensitive.
|
|
*
|
|
* Unlike @ref eina_hash_add_by_hash(), this function does not make a
|
|
* copy of @p key, so it must be a string constant or stored elsewhere
|
|
* (such as inside the object being added).
|
|
*
|
|
* @see eina_hash_direct_add()
|
|
*/
|
|
EAPI Eina_Bool eina_hash_direct_add_by_hash(Eina_Hash *hash,
|
|
const void *key,
|
|
int key_length,
|
|
int key_hash,
|
|
const void *data) EINA_ARG_NONNULL(1, 2, 5);
|
|
|
|
/**
|
|
* @brief Removes the entry identified by a key and a key hash from the given
|
|
* hash table.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key The key. Cannot be @c NULL.
|
|
* @param[in] key_length The length of the key (including terminating '\\0').
|
|
* @param[in] key_hash The hash that always matches the key.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function removes the entry identified by @p key and
|
|
* @p key_hash from @p hash. If a free function was given to the
|
|
* callback on creation, it will be called for the data being
|
|
* deleted. If @p hash or @p key are @c NULL, the
|
|
* function returns #EINA_FALSE immediately.
|
|
*
|
|
* @note If you don't have the key_hash, use eina_hash_del_by_key()
|
|
* instead. If you don't have the key, use eina_hash_del_by_data().
|
|
*/
|
|
EAPI Eina_Bool eina_hash_del_by_key_hash(Eina_Hash *hash,
|
|
const void *key,
|
|
int key_length,
|
|
int key_hash) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @brief Removes the entry identified by a key from the given hash table.
|
|
*
|
|
* This version will calculate key length and hash by using functions
|
|
* provided to the hash creation function.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key The key. Cannot be @c NULL.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function removes the entry identified by @p key from @p
|
|
* hash. The key length and hash will be calculated automatically via
|
|
* a function provided to the hash creation function. If a free
|
|
* function was given to the callback on creation, it will be called
|
|
* for the data being deleted. If @p hash or @p key are @c NULL, the
|
|
* function returns #EINA_FALSE immediately.
|
|
*
|
|
* @note If you already have the key_hash, use eina_hash_del_by_key_hash().
|
|
* If you don't have the key, use eina_hash_del_by_data() instead.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_del_by_key(Eina_Hash *hash,
|
|
const void *key) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @brief Removes an entry from a hash table identified by its data value.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] data The data value to search and remove. Cannot be @c NULL.
|
|
* @return #EINA_FALSE if an error occurred or if @p hash or @p data are
|
|
* @c NULL, #EINA_TRUE otherwise.
|
|
* thing goes fine.
|
|
*
|
|
* This function removes the entry identified by @p data from @p
|
|
* hash. If a free function was given to the callback on creation, it
|
|
* will be called for the data being deleted.
|
|
*
|
|
* @note This version is slow since there is no quick access to nodes
|
|
* based on data.
|
|
*
|
|
* @note If you already have the key, use eina_hash_del_by_key()
|
|
* or eina_hash_del_by_key_hash() instead.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_del_by_data(Eina_Hash *hash,
|
|
const void *data) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @brief Removes the entry identified by a key and a key hash, or a
|
|
* data value from the given hash table.
|
|
*
|
|
* If @p key is @c NULL, then @p data is used to find a match to
|
|
* remove.
|
|
*
|
|
* @param[in,out] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key The key.
|
|
* @param[in] key_length The length of the key.
|
|
* @param[in] key_hash The hash that always match the key.
|
|
* @param[in] data The data pointer to remove if the key is @c NULL.
|
|
* @return #EINA_FALSE if an error occurred, #EINA_TRUE otherwise.
|
|
*
|
|
* This function removes the entry identified by @p key and @p key_hash,
|
|
* or @p data, from @p hash. If a free function was given to the
|
|
* callback on creation, it will be called for the data being
|
|
* deleted. If @p hash is @c NULL, the function returns #EINA_FALSE
|
|
* immediately. If @p key is @c NULL, then @p key_length and @p
|
|
* key_hash are ignored and @p data is used to find a match to remove,
|
|
* otherwise @p key and @p key_hash are used and @p data is not required
|
|
* and can be @c NULL. Do not forget to count '\\0' for string when
|
|
* setting the value of @p key_length.
|
|
*
|
|
* @note If you already have the key, use eina_hash_del_by_key_hash().
|
|
* If you don't have the key, use eina_hash_del_by_data() directly.
|
|
*/
|
|
EAPI Eina_Bool eina_hash_del_by_hash(Eina_Hash *hash,
|
|
const void *key,
|
|
int key_length,
|
|
int key_hash,
|
|
const void *data) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief Retrieves a specific entry from the given hash table.
|
|
*
|
|
* @param[in] hash The given hash table. Cannot be @c NULL.
|
|
* @param[in] key The key of the entry to find.
|
|
* @param[in] key_length The length of the key.
|
|
* @param[in] key_hash The hash that always matches the key
|
|
* @return The data pointer for the stored entry on success, or @c NULL
|
|
* if @p hash is @c NULL or if the data pointer could not be retrieved.
|
|
*
|
|
* This function retrieves the entry associated with @p key of length
|
|
* @p key_length in @p hash. @p key_hash is the hash that always matches
|
|
* @p key. It is ignored if @p key is @c NULL. Do not forget to count
|
|
* '\\0' for string when setting the value of @p key_length.
|
|
*/
|
|
EAPI void *eina_hash_find_by_hash(const Eina_Hash *hash,
|
|
const void *key,
|
|
int key_length,
|
|
int key_hash) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @brief Modifies the entry pointer at the specified key and returns
|
|
* the previous entry.
|
|
*
|
|
* @param[in,out] hash The given hash table.
|
|
* @param[in] key The key of the entry to modify.
|
|
* @param[in] key_length Should be the length of @p key (don't forget to count
|
|
* '\\0' for string).
|
|
* @param[in] key_hash The hash that always matches the key. Ignored if @p
|
|
* key is @c NULL.
|
|
* @param[in] data The data to replace the current entry, if it exists.
|
|
* @return The data pointer for the previously stored entry, or @c NULL
|
|
* if not found. If an existing entry is not found, nothing is added to
|
|
* the hash.
|
|
*/
|
|
EAPI void *eina_hash_modify_by_hash(Eina_Hash *hash,
|
|
const void *key,
|
|
int key_length,
|
|
int key_hash,
|
|
const void *data) EINA_ARG_NONNULL(1, 2, 5);
|
|
|
|
/**
|
|
* @brief Returns a new iterator associated with hash keys.
|
|
*
|
|
* @param[in] hash The hash.
|
|
* @return A new iterator, or @c NULL if memory could not be allocated.
|
|
*
|
|
* This function returns a newly allocated iterator associated with @p
|
|
* hash. If @p hash is not populated, this function still returns a
|
|
* valid iterator that will always return false on
|
|
* eina_iterator_next().
|
|
*
|
|
* @warning If the hash structure changes then the iterator becomes
|
|
* invalid; adding or removing items may lead to program crash.
|
|
*/
|
|
EAPI Eina_Iterator *eina_hash_iterator_key_new(const Eina_Hash *hash) EINA_MALLOC EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
|
|
|
|
/**
|
|
* @brief Returns a new iterator associated with a hash.
|
|
*
|
|
* @param[in] hash The hash.
|
|
* @return A new iterator, or @c NULL if memory could not be allocated.
|
|
*
|
|
* This function returns a newly allocated iterator associated with
|
|
* @p hash. If @p hash is not populated, this function still returns a
|
|
* valid iterator that will always return false on
|
|
* eina_iterator_next().
|
|
*
|
|
* @warning If the hash structure changes then the iterator becomes
|
|
* invalid; adding or removing items may lead to program crash.
|
|
*/
|
|
EAPI Eina_Iterator *eina_hash_iterator_data_new(const Eina_Hash *hash) EINA_MALLOC EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
|
|
|
|
/**
|
|
* @brief Returned a new iterator associated with hash keys and data.
|
|
*
|
|
* @param[in] hash The hash.
|
|
* @return A new iterator, or @c NULL if memory could not be allocated.
|
|
*
|
|
* This function returns a newly allocated iterator associated with @p
|
|
* hash. If @p hash is not populated, this function still returns a
|
|
* valid iterator that will always return false on
|
|
* eina_iterator_next().
|
|
*
|
|
* @note Iterator data will provide values as Eina_Hash_Tuple that
|
|
* should not be modified!
|
|
*
|
|
* @warning If the hash structure changes then the iterator becomes
|
|
* invalid; adding or removing items may lead to program crash.
|
|
*/
|
|
EAPI Eina_Iterator *eina_hash_iterator_tuple_new(const Eina_Hash *hash) EINA_MALLOC EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
|
|
|
|
/**
|
|
* @brief Calls a function on every member stored in the hash table.
|
|
*
|
|
* @param[in] hash The hash table whose members will be walked.
|
|
* @param[in] func The function to call on each parameter.
|
|
* @param[in] fdata The data pointer to pass to the function being called.
|
|
*
|
|
* This function iterates over the hash table @p hash, calling the
|
|
* function @p func on each member. If @p func modifies the contents
|
|
* of the hash table, or wishes to stop processing it should return
|
|
* #EINA_FALSE. If @p func returns #EINA_TRUE the foreach loop will
|
|
* keep processing.
|
|
*
|
|
* Example:
|
|
* @code
|
|
* extern Eina_Hash *hash;
|
|
*
|
|
* Eina_Bool hash_fn(const Eina_Hash *hash, const void *key,
|
|
* void *data, void *fdata)
|
|
* {
|
|
* printf("Func data: %s, Hash entry: %s / %p\n",
|
|
* fdata, (const char *)key, data);
|
|
* return EINA_TRUE;
|
|
* }
|
|
*
|
|
* int main(int argc, char **argv)
|
|
* {
|
|
* char *hash_fn_data;
|
|
*
|
|
* hash_fn_data = strdup("Hello World");
|
|
* eina_hash_foreach(hash, hash_fn, hash_fn_data);
|
|
* free(hash_fn_data);
|
|
* }
|
|
* @endcode
|
|
*/
|
|
EAPI void eina_hash_foreach(const Eina_Hash *hash,
|
|
Eina_Hash_Foreach func,
|
|
const void *fdata) EINA_ARG_NONNULL(1, 2);
|
|
|
|
|
|
/**
|
|
* @brief Appends data to an #Eina_List inside a hash.
|
|
*
|
|
* This function is identical to the sequence of calling
|
|
* eina_hash_find(), eina_list_append(), eina_hash_set(),
|
|
* but with one fewer required hash lookup.
|
|
*
|
|
* @param[in,out] hash The hash table.
|
|
* @param[in] key The key associated with the data.
|
|
* @param[in] data The data to append to the list.
|
|
*
|
|
* @since 1.10
|
|
*/
|
|
EAPI void eina_hash_list_append(Eina_Hash *hash, const void *key, const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Appends data to an #Eina_List inside a hash using eina_hash_direct_add().
|
|
*
|
|
* This function is identical to the sequence of calling
|
|
* eina_hash_find(), eina_list_append(), eina_hash_set(),
|
|
* but with one fewer required hash lookup.
|
|
*
|
|
* @param[in,out] hash The hash table.
|
|
* @param[in] key The key associated with the data.
|
|
* @param[in] data The data to append to the list.
|
|
*
|
|
* @since 1.23
|
|
*/
|
|
EAPI void eina_hash_list_direct_append(Eina_Hash *hash, const void *key, const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Prepends data to an #Eina_List inside a hash.
|
|
*
|
|
* This function is identical to the sequence of calling
|
|
* eina_hash_find(), eina_list_prepend(), eina_hash_set(),
|
|
* but with one fewer required hash lookup.
|
|
*
|
|
* @param[in,out] hash The hash table.
|
|
* @param[in] key The key associated with the data.
|
|
* @param[in] data The data to prepend to the list.
|
|
*
|
|
* @since 1.10
|
|
*/
|
|
EAPI void eina_hash_list_prepend(Eina_Hash *hash, const void *key, const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Prepends data to an #Eina_List inside a hash using eina_hash_direct_add().
|
|
*
|
|
* This function is identical to the sequence of calling
|
|
* eina_hash_find(), eina_list_prepend(), eina_hash_set(),
|
|
* but with one fewer required hash lookup.
|
|
*
|
|
* @param[in,out] hash The hash table.
|
|
* @param[in] key The key associated with the data.
|
|
* @param[in] data The data to prepend to the list.
|
|
*
|
|
* @since 1.23
|
|
*/
|
|
EAPI void eina_hash_list_direct_prepend(Eina_Hash *hash, const void *key, const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief Removes data from an #Eina_List inside a hash.
|
|
*
|
|
* This function is identical to the sequence of calling
|
|
* eina_hash_find(), eina_list_remove(), eina_hash_set(),
|
|
* but with one fewer required hash lookup.
|
|
*
|
|
* @param[in,out] hash The hash table.
|
|
* @param[in] key The key associated with the data.
|
|
* @param[in] data The data to remove from the list.
|
|
*
|
|
* @since 1.10
|
|
*/
|
|
EAPI void eina_hash_list_remove(Eina_Hash *hash, const void *key, const void *data) EINA_ARG_NONNULL(1, 2, 3);
|
|
|
|
/**
|
|
* @brief
|
|
* Paul Hsieh (http://www.azillionmonkeys.com/qed/hash.html) hash function used by WebCore (http://webkit.org/blog/8/hashtables-part-2/)
|
|
*
|
|
* @param[in] key The key to hash.
|
|
* @param[in] len The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
EAPI int eina_hash_superfast(const char *key,
|
|
int len) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief
|
|
* Hash function first reported by Dan Bernstein many years ago in comp.lang.c
|
|
*
|
|
* @param[in] key The key to hash.
|
|
* @param[in] len The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
static inline int eina_hash_djb2(const char *key,
|
|
int len) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief
|
|
* Hash function first reported by Dan Bernstein many years ago in comp.lang.c
|
|
*
|
|
* @param[in] key The key to hash.
|
|
* @param[in] plen The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
static inline int eina_hash_djb2_len(const char *key,
|
|
int *plen) EINA_ARG_NONNULL(1, 2);
|
|
|
|
/**
|
|
* @brief
|
|
* Hash function from http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm
|
|
*
|
|
* @param[in] pkey The key to hash.
|
|
* @param[in] len The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
static inline int eina_hash_int32(const unsigned int *pkey,
|
|
int len) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief
|
|
* Hash function from http://web.archive.org/web/20071223173210/http://www.concentric.net/~Ttwang/tech/inthash.htm
|
|
*
|
|
* @param[in] pkey The key to hash.
|
|
* @param[in] len The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
static inline int eina_hash_int64(const unsigned long long int *pkey,
|
|
int len) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief
|
|
* Hash function from http://sites.google.com/site/murmurhash/
|
|
*
|
|
* @param[in] key The key to hash.
|
|
* @param[in] len The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
static inline int eina_hash_murmur3(const char *key,
|
|
int len) EINA_ARG_NONNULL(1);
|
|
|
|
/**
|
|
* @brief
|
|
* Hash function using crc-32 algorithm and and 0xEDB88320 polynomial
|
|
*
|
|
* @param[in] key The key to hash.
|
|
* @param[in] len The length of the key.
|
|
* @return The hash value.
|
|
*/
|
|
static inline int eina_hash_crc(const char *key,
|
|
int len) EINA_ARG_NONNULL(1);
|
|
|
|
#include "eina_inline_hash.x"
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /*EINA_HASH_H_*/
|