Typedefs | |
typedef int(* | KeyCompareFunc )(const void *key_a, const void *key_b) |
Key comparison function. | |
typedef DBusHashIter | DBusHashIter |
Public opaque hash table iterator object. | |
typedef DBusHashTable | DBusHashTable |
Public opaque hash table object. | |
Enumerations | |
enum | DBusHashType { DBUS_HASH_STRING, DBUS_HASH_TWO_STRINGS, DBUS_HASH_INT, DBUS_HASH_POINTER, DBUS_HASH_ULONG } |
Indicates the type of a key in the hash table. | |
Functions | |
DBusHashTable * | _dbus_hash_table_new (DBusHashType type, DBusFreeFunction key_free_function, DBusFreeFunction value_free_function) |
Constructs a new hash table. | |
DBusHashTable * | _dbus_hash_table_ref (DBusHashTable *table) |
Increments the reference count for a hash table. | |
void | _dbus_hash_table_unref (DBusHashTable *table) |
Decrements the reference count for a hash table, freeing the hash table if the count reaches zero. | |
void | _dbus_hash_iter_init (DBusHashTable *table, DBusHashIter *iter) |
Initializes a hash table iterator. | |
dbus_bool_t | _dbus_hash_iter_next (DBusHashIter *iter) |
Move the hash iterator forward one step, to the next hash entry. | |
void | _dbus_hash_iter_remove_entry (DBusHashIter *iter) |
Removes the current entry from the hash table. | |
void * | _dbus_hash_iter_get_value (DBusHashIter *iter) |
Gets the value of the current entry. | |
void | _dbus_hash_iter_set_value (DBusHashIter *iter, void *value) |
Sets the value of the current entry. | |
int | _dbus_hash_iter_get_int_key (DBusHashIter *iter) |
Gets the key for the current entry. | |
unsigned long | _dbus_hash_iter_get_ulong_key (DBusHashIter *iter) |
Gets the key for the current entry. | |
const char * | _dbus_hash_iter_get_string_key (DBusHashIter *iter) |
Gets the key for the current entry. | |
const char * | _dbus_hash_iter_get_two_strings_key (DBusHashIter *iter) |
Gets the key for the current entry. | |
dbus_bool_t | _dbus_hash_iter_lookup (DBusHashTable *table, void *key, dbus_bool_t create_if_not_found, DBusHashIter *iter) |
A low-level but efficient interface for manipulating the hash table. | |
void * | _dbus_hash_table_lookup_string (DBusHashTable *table, const char *key) |
Looks up the value for a given string in a hash table of type #DBUS_HASH_STRING. | |
void * | _dbus_hash_table_lookup_two_strings (DBusHashTable *table, const char *key) |
Looks up the value for a given string in a hash table of type #DBUS_HASH_TWO_STRINGS. | |
void * | _dbus_hash_table_lookup_int (DBusHashTable *table, int key) |
Looks up the value for a given integer in a hash table of type #DBUS_HASH_INT. | |
void * | _dbus_hash_table_lookup_ulong (DBusHashTable *table, unsigned long key) |
Looks up the value for a given integer in a hash table of type #DBUS_HASH_ULONG. | |
dbus_bool_t | _dbus_hash_table_remove_string (DBusHashTable *table, const char *key) |
Removes the hash entry for the given key. | |
dbus_bool_t | _dbus_hash_table_remove_two_strings (DBusHashTable *table, const char *key) |
Removes the hash entry for the given key. | |
dbus_bool_t | _dbus_hash_table_remove_int (DBusHashTable *table, int key) |
Removes the hash entry for the given key. | |
dbus_bool_t | _dbus_hash_table_remove_ulong (DBusHashTable *table, unsigned long key) |
Removes the hash entry for the given key. | |
dbus_bool_t | _dbus_hash_table_insert_string (DBusHashTable *table, char *key, void *value) |
Creates a hash entry with the given key and value. | |
dbus_bool_t | _dbus_hash_table_insert_two_strings (DBusHashTable *table, char *key, void *value) |
Creates a hash entry with the given key and value. | |
dbus_bool_t | _dbus_hash_table_insert_int (DBusHashTable *table, int key, void *value) |
Creates a hash entry with the given key and value. | |
dbus_bool_t | _dbus_hash_table_insert_ulong (DBusHashTable *table, unsigned long key, void *value) |
Creates a hash entry with the given key and value. | |
DBusPreallocatedHash * | _dbus_hash_table_preallocate_entry (DBusHashTable *table) |
Preallocate an opaque data blob that allows us to insert into the hash table at a later time without allocating any memory. | |
void | _dbus_hash_table_free_preallocated_entry (DBusHashTable *table, DBusPreallocatedHash *preallocated) |
Frees an opaque DBusPreallocatedHash that was *not* used in order to insert into the hash table. | |
void | _dbus_hash_table_insert_string_preallocated (DBusHashTable *table, DBusPreallocatedHash *preallocated, char *key, void *value) |
Inserts a string-keyed entry into the hash table, using a preallocated data block from _dbus_hash_table_preallocate_entry(). | |
int | _dbus_hash_table_get_n_entries (DBusHashTable *table) |
Gets the number of hash entries in a hash table. |
Types and functions related to DBusHashTable.
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Gets the key for the current entry. Only works for hash tables of type #DBUS_HASH_INT.
References _dbus_assert, _DBUS_POINTER_TO_INT, DBusRealHashIter::entry, DBusHashEntry::key, NULL, and DBusRealHashIter::table. |
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Gets the key for the current entry. Only works for hash tables of type #DBUS_HASH_STRING
References _dbus_assert, DBusRealHashIter::entry, DBusHashEntry::key, NULL, and DBusRealHashIter::table. |
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Gets the key for the current entry. Only works for hash tables of type #DBUS_HASH_TWO_STRINGS
References _dbus_assert, DBusRealHashIter::entry, DBusHashEntry::key, NULL, and DBusRealHashIter::table. |
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Gets the key for the current entry. Only works for hash tables of type #DBUS_HASH_ULONG.
References _dbus_assert, DBusRealHashIter::entry, DBusHashEntry::key, NULL, and DBusRealHashIter::table. |
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Gets the value of the current entry.
References _dbus_assert, DBusRealHashIter::entry, NULL, DBusRealHashIter::table, and DBusHashEntry::value. |
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Initializes a hash table iterator. To iterate over all entries in a hash table, use the following code (the printf assumes a hash from strings to strings obviously):
DBusHashIter iter; _dbus_hash_iter_init (table, &iter); while (_dbus_hash_iter_next (&iter)) { printf ("The first key is %s and value is %s\n", _dbus_hash_iter_get_string_key (&iter), _dbus_hash_iter_get_value (&iter)); } The iterator is initialized pointing "one before" the first hash entry. The first call to _dbus_hash_iter_next() moves it onto the first valid entry or returns FALSE if the hash table is empty. Subsequent calls move to the next valid entry or return FALSE if there are no more entries. Note that it is guaranteed to be safe to remove a hash entry during iteration, but it is not safe to add a hash entry.
References _dbus_assert, DBusRealHashIter::bucket, DBusRealHashIter::entry, n_entries, DBusRealHashIter::n_entries_on_init, DBusRealHashIter::next_bucket, DBusRealHashIter::next_entry, NULL, and DBusRealHashIter::table. |
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A low-level but efficient interface for manipulating the hash table. It's efficient because you can get, set, and optionally create the hash entry while only running the hash function one time. Note that while calling _dbus_hash_iter_next() on the iterator filled in by this function may work, it's completely undefined which entries are after this iter and which are before it. So it would be silly to iterate using this iterator. If the hash entry is created, its value will be initialized to all bits zero. FALSE may be returned due to memory allocation failure, or because create_if_not_found was FALSE and the entry did not exist. If create_if_not_found is TRUE and the entry is created, the hash table takes ownership of the key that's passed in. For a hash table of type #DBUS_HASH_INT, cast the int key to the key parameter using _DBUS_INT_TO_POINTER().
References _dbus_assert, DBusRealHashIter::bucket, buckets, dbus_bool_t, DBusHashEntry, DBusRealHashIter::entry, FALSE, find_function, n_entries, DBusRealHashIter::n_entries_on_init, DBusHashEntry::next, DBusRealHashIter::next_bucket, DBusRealHashIter::next_entry, NULL, DBusRealHashIter::table, and TRUE. |
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Move the hash iterator forward one step, to the next hash entry. The documentation for _dbus_hash_iter_init() explains in more detail.
References _dbus_assert, DBusRealHashIter::bucket, buckets, DBusRealHashIter::entry, FALSE, n_buckets, n_entries, DBusRealHashIter::n_entries_on_init, DBusHashEntry::next, DBusRealHashIter::next_bucket, DBusRealHashIter::next_entry, NULL, DBusRealHashIter::table, and TRUE. |
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Removes the current entry from the hash table. If a key_free_function or value_free_function was provided to _dbus_hash_table_new(), frees the key and/or value for this entry.
References _dbus_assert, DBusRealHashIter::bucket, DBusRealHashIter::entry, NULL, and DBusRealHashIter::table. |
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Sets the value of the current entry. If the hash table has a value_free_function it will be used to free the previous value. The hash table will own the passed-in value (it will not be copied).
References _dbus_assert, DBusRealHashIter::entry, free_value_function, NULL, DBusRealHashIter::table, and DBusHashEntry::value. |
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Frees an opaque DBusPreallocatedHash that was *not* used in order to insert into the hash table.
References _dbus_assert, _dbus_mem_pool_dealloc(), DBusHashEntry, entry_pool, and NULL. |
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Gets the number of hash entries in a hash table.
References n_entries. |
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Creates a hash entry with the given key and value. The key and value are not copied; they are stored in the hash table by reference. If an entry with the given key already exists, the previous key and value are overwritten (and freed if the hash table has a key_free_function and/or value_free_function). Returns FALSE if memory for the new hash entry can't be allocated.
References _dbus_assert, _DBUS_INT_TO_POINTER, DBusHashEntry, FALSE, find_function, free_key_function, free_value_function, DBusHashEntry::key, key_type, NULL, TRUE, and DBusHashEntry::value. |
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Creates a hash entry with the given key and value. The key and value are not copied; they are stored in the hash table by reference. If an entry with the given key already exists, the previous key and value are overwritten (and freed if the hash table has a key_free_function and/or value_free_function). Returns FALSE if memory for the new hash entry can't be allocated.
References _dbus_assert, _dbus_hash_table_insert_string_preallocated(), _dbus_hash_table_preallocate_entry(), FALSE, key_type, NULL, and TRUE. |
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Inserts a string-keyed entry into the hash table, using a preallocated data block from _dbus_hash_table_preallocate_entry(). This function cannot fail due to lack of memory. The DBusPreallocatedHash object is consumed and should not be reused or freed. Otherwise this function works just like _dbus_hash_table_insert_string().
References _dbus_assert, DBusHashEntry, find_function, free_key_function, free_value_function, DBusHashEntry::key, key_type, NULL, TRUE, and DBusHashEntry::value. Referenced by _dbus_hash_table_insert_string(). |
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Creates a hash entry with the given key and value. The key and value are not copied; they are stored in the hash table by reference. If an entry with the given key already exists, the previous key and value are overwritten (and freed if the hash table has a key_free_function and/or value_free_function). Returns FALSE if memory for the new hash entry can't be allocated.
References _dbus_assert, DBusHashEntry, FALSE, find_function, free_key_function, free_value_function, DBusHashEntry::key, key_type, NULL, TRUE, and DBusHashEntry::value. |
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Creates a hash entry with the given key and value. The key and value are not copied; they are stored in the hash table by reference. If an entry with the given key already exists, the previous key and value are overwritten (and freed if the hash table has a key_free_function and/or value_free_function). Returns FALSE if memory for the new hash entry can't be allocated.
References _dbus_assert, DBusHashEntry, FALSE, find_function, free_key_function, free_value_function, DBusHashEntry::key, key_type, NULL, TRUE, and DBusHashEntry::value. |
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Looks up the value for a given integer in a hash table of type #DBUS_HASH_INT. Returns NULL if the value is not present. (A not-present entry is indistinguishable from an entry with a value of NULL.)
References _dbus_assert, _DBUS_INT_TO_POINTER, DBusHashEntry, FALSE, find_function, key_type, NULL, and DBusHashEntry::value. Referenced by _dbus_connection_queue_received_message_link(), and dbus_connection_dispatch(). |
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Looks up the value for a given string in a hash table of type #DBUS_HASH_STRING. Returns NULL if the value is not present. (A not-present entry is indistinguishable from an entry with a value of NULL.)
References _dbus_assert, DBusHashEntry, FALSE, find_function, key_type, NULL, and DBusHashEntry::value. |
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Looks up the value for a given string in a hash table of type #DBUS_HASH_TWO_STRINGS. Returns NULL if the value is not present. (A not-present entry is indistinguishable from an entry with a value of NULL.)
References _dbus_assert, DBusHashEntry, FALSE, find_function, key_type, NULL, and DBusHashEntry::value. |
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Looks up the value for a given integer in a hash table of type #DBUS_HASH_ULONG. Returns NULL if the value is not present. (A not-present entry is indistinguishable from an entry with a value of NULL.)
References _dbus_assert, DBusHashEntry, FALSE, find_function, key_type, NULL, and DBusHashEntry::value. |
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Constructs a new hash table. Should be freed with _dbus_hash_table_unref(). If memory cannot be allocated for the hash table, returns NULL.
References _dbus_assert, _dbus_assert_not_reached, _dbus_mem_pool_new(), _DBUS_N_ELEMENTS, buckets, dbus_free(), dbus_new0, DBUS_SMALL_HASH_TABLE, DBusFreeFunction, DBusHashEntry, down_shift, entry_pool, find_function, free_key_function, free_value_function, hi_rebuild_size, key_type, lo_rebuild_size, mask, n_buckets, n_entries, NULL, REBUILD_MULTIPLIER, refcount, static_buckets, and TRUE. Referenced by _dbus_connection_new_for_transport(), and _dbus_user_database_new(). |
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Preallocate an opaque data blob that allows us to insert into the hash table at a later time without allocating any memory.
References DBusHashEntry. Referenced by _dbus_hash_table_insert_string(). |
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Increments the reference count for a hash table.
References refcount. |
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Removes the hash entry for the given key. If no hash entry for the key exists, does nothing.
References _dbus_assert, _DBUS_INT_TO_POINTER, DBusHashEntry, FALSE, find_function, key_type, NULL, and TRUE. |
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Removes the hash entry for the given key. If no hash entry for the key exists, does nothing.
References _dbus_assert, DBusHashEntry, FALSE, find_function, key_type, NULL, and TRUE. |
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Removes the hash entry for the given key. If no hash entry for the key exists, does nothing.
References _dbus_assert, DBusHashEntry, FALSE, find_function, key_type, NULL, and TRUE. |
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Removes the hash entry for the given key. If no hash entry for the key exists, does nothing.
References _dbus_assert, DBusHashEntry, FALSE, find_function, key_type, NULL, and TRUE. |
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Decrements the reference count for a hash table, freeing the hash table if the count reaches zero.
References _dbus_mem_pool_free(), buckets, dbus_free(), DBusHashEntry, entry_pool, n_buckets, DBusHashEntry::next, NULL, refcount, and static_buckets. Referenced by _dbus_connection_new_for_transport(), and _dbus_user_database_unref(). |