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isc
ht.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /* ! \file */ #pragma once #include <inttypes.h> #include <string.h> #include <isc/result.h> #include <isc/types.h> typedef struct isc_ht isc_ht_t; typedef struct isc_ht_iter isc_ht_iter_t; enum { ISC_HT_CASE_SENSITIVE = 0x00, ISC_HT_CASE_INSENSITIVE = 0x01 }; /*% * Initialize hashtable at *htp, using memory context and size of (1<<bits) * * If 'options' contains ISC_HT_CASE_INSENSITIVE, then upper- and lower-case * letters in key values will generate the same hash values; this can be used * when the key for a hash table is a DNS name. * * Requires: *\li 'htp' is not NULL and '*htp' is NULL. *\li 'mctx' is a valid memory context. *\li 'bits' >=1 and 'bits' <=32 * */ void isc_ht_init(isc_ht_t **htp, isc_mem_t *mctx, uint8_t bits, unsigned int options); /*% * Destroy hashtable, freeing everything * * Requires: * \li '*htp' is valid hashtable */ void isc_ht_destroy(isc_ht_t **htp); /*% * Add a node to hashtable, pointed by binary key 'key' of size 'keysize'; * set its value to 'value' * * Requires: *\li 'ht' is a valid hashtable *\li write-lock * * Returns: *\li #ISC_R_NOMEMORY -- not enough memory to create pool *\li #ISC_R_EXISTS -- node of the same key already exists *\li #ISC_R_SUCCESS -- all is well. */ isc_result_t isc_ht_add(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize, void *value); /*% * Find a node matching 'key'/'keysize' in hashtable 'ht'; * if found, set '*valuep' to its value. (If 'valuep' is NULL, * then simply return SUCCESS or NOTFOUND to indicate whether the * key exists in the hashtable.) * * Requires: * \li 'ht' is a valid hashtable * \li read-lock * * Returns: * \li #ISC_R_SUCCESS -- success * \li #ISC_R_NOTFOUND -- key not found */ isc_result_t isc_ht_find(const isc_ht_t *ht, const unsigned char *key, const uint32_t keysize, void **valuep); /*% * Delete node from hashtable * * Requires: *\li ht is a valid hashtable *\li write-lock * * Returns: *\li #ISC_R_NOTFOUND -- key not found *\li #ISC_R_SUCCESS -- all is well */ isc_result_t isc_ht_delete(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize); /*% * Create an iterator for the hashtable; point '*itp' to it. * * Requires: *\li 'ht' is a valid hashtable *\li 'itp' is non NULL and '*itp' is NULL. */ void isc_ht_iter_create(isc_ht_t *ht, isc_ht_iter_t **itp); /*% * Destroy the iterator '*itp', set it to NULL * * Requires: *\li 'itp' is non NULL and '*itp' is non NULL. */ void isc_ht_iter_destroy(isc_ht_iter_t **itp); /*% * Set an iterator to the first entry. * * Requires: *\li 'it' is non NULL. * * Returns: * \li #ISC_R_SUCCESS -- success * \li #ISC_R_NOMORE -- no data in the hashtable */ isc_result_t isc_ht_iter_first(isc_ht_iter_t *it); /*% * Set an iterator to the next entry. * * Requires: *\li 'it' is non NULL. * * Returns: * \li #ISC_R_SUCCESS -- success * \li #ISC_R_NOMORE -- end of hashtable reached */ isc_result_t isc_ht_iter_next(isc_ht_iter_t *it); /*% * Delete current entry and set an iterator to the next entry. * * Requires: *\li 'it' is non NULL. * * Returns: * \li #ISC_R_SUCCESS -- success * \li #ISC_R_NOMORE -- end of hashtable reached */ isc_result_t isc_ht_iter_delcurrent_next(isc_ht_iter_t *it); /*% * Set 'value' to the current value under the iterator * * Requires: *\li 'it' is non NULL. *\li 'valuep' is non NULL and '*valuep' is NULL. */ void isc_ht_iter_current(isc_ht_iter_t *it, void **valuep); /*% * Set 'key' and 'keysize to the current key and keysize for the value * under the iterator * * Requires: *\li 'it' is non NULL. *\li 'key' is non NULL and '*key' is NULL. *\li 'keysize' is non NULL. */ void isc_ht_iter_currentkey(isc_ht_iter_t *it, unsigned char **key, size_t *keysize); /*% * Returns the number of items in the hashtable. * * Requires: *\li 'ht' is a valid hashtable */ size_t isc_ht_count(const isc_ht_t *ht);
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