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-/* Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef APR_HASH_H
-#define APR_HASH_H
-
-/**
- * @file apr_hash.h
- * @brief APR Hash Tables
- */
-
-#include "apr_pools.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @defgroup apr_hash Hash Tables
- * @ingroup APR
- * @{
- */
-
-/**
- * When passing a key to apr_hash_set or apr_hash_get, this value can be
- * passed to indicate a string-valued key, and have apr_hash compute the
- * length automatically.
- *
- * @remark apr_hash will use strlen(key) for the length. The null-terminator
- * is not included in the hash value (why throw a constant in?).
- * Since the hash table merely references the provided key (rather
- * than copying it), apr_hash_this() will return the null-term'd key.
- */
-#define APR_HASH_KEY_STRING (-1)
-
-/**
- * Abstract type for hash tables.
- */
-typedef struct apr_hash_t apr_hash_t;
-
-/**
- * Abstract type for scanning hash tables.
- */
-typedef struct apr_hash_index_t apr_hash_index_t;
-
-/**
- * Create a hash table.
- * @param pool The pool to allocate the hash table out of
- * @return The hash table just created
- */
-APR_DECLARE(apr_hash_t *) apr_hash_make(apr_pool_t *pool);
-
-/**
- * Make a copy of a hash table
- * @param pool The pool from which to allocate the new hash table
- * @param h The hash table to clone
- * @return The hash table just created
- * @remark Makes a shallow copy
- */
-APR_DECLARE(apr_hash_t *) apr_hash_copy(apr_pool_t *pool,
- const apr_hash_t *h);
-
-/**
- * Associate a value with a key in a hash table.
- * @param ht The hash table
- * @param key Pointer to the key
- * @param klen Length of the key. Can be APR_HASH_KEY_STRING to use the string length.
- * @param val Value to associate with the key
- * @remark If the value is NULL the hash entry is deleted.
- */
-APR_DECLARE(void) apr_hash_set(apr_hash_t *ht, const void *key,
- apr_ssize_t klen, const void *val);
-
-/**
- * Look up the value associated with a key in a hash table.
- * @param ht The hash table
- * @param key Pointer to the key
- * @param klen Length of the key. Can be APR_HASH_KEY_STRING to use the string length.
- * @return Returns NULL if the key is not present.
- */
-APR_DECLARE(void *) apr_hash_get(apr_hash_t *ht, const void *key,
- apr_ssize_t klen);
-
-/**
- * Start iterating over the entries in a hash table.
- * @param p The pool to allocate the apr_hash_index_t iterator. If this
- * pool is NULL, then an internal, non-thread-safe iterator is used.
- * @param ht The hash table
- * @remark There is no restriction on adding or deleting hash entries during
- * an iteration (although the results may be unpredictable unless all you do
- * is delete the current entry) and multiple iterations can be in
- * progress at the same time.
-
- * @example
- */
-/**
- * <PRE>
- *
- * int sum_values(apr_pool_t *p, apr_hash_t *ht)
- * {
- * apr_hash_index_t *hi;
- * void *val;
- * int sum = 0;
- * for (hi = apr_hash_first(p, ht); hi; hi = apr_hash_next(hi)) {
- * apr_hash_this(hi, NULL, NULL, &val);
- * sum += *(int *)val;
- * }
- * return sum;
- * }
- * </PRE>
- */
-APR_DECLARE(apr_hash_index_t *) apr_hash_first(apr_pool_t *p, apr_hash_t *ht);
-
-/**
- * Continue iterating over the entries in a hash table.
- * @param hi The iteration state
- * @return a pointer to the updated iteration state. NULL if there are no more
- * entries.
- */
-APR_DECLARE(apr_hash_index_t *) apr_hash_next(apr_hash_index_t *hi);
-
-/**
- * Get the current entry's details from the iteration state.
- * @param hi The iteration state
- * @param key Return pointer for the pointer to the key.
- * @param klen Return pointer for the key length.
- * @param val Return pointer for the associated value.
- * @remark The return pointers should point to a variable that will be set to the
- * corresponding data, or they may be NULL if the data isn't interesting.
- */
-APR_DECLARE(void) apr_hash_this(apr_hash_index_t *hi, const void **key,
- apr_ssize_t *klen, void **val);
-
-/**
- * Get the number of key/value pairs in the hash table.
- * @param ht The hash table
- * @return The number of key/value pairs in the hash table.
- */
-APR_DECLARE(unsigned int) apr_hash_count(apr_hash_t *ht);
-
-/**
- * Merge two hash tables into one new hash table. The values of the overlay
- * hash override the values of the base if both have the same key.
- * @param p The pool to use for the new hash table
- * @param overlay The table to add to the initial table
- * @param base The table that represents the initial values of the new table
- * @return A new hash table containing all of the data from the two passed in
- */
-APR_DECLARE(apr_hash_t *) apr_hash_overlay(apr_pool_t *p,
- const apr_hash_t *overlay,
- const apr_hash_t *base);
-
-/**
- * Merge two hash tables into one new hash table. If the same key
- * is present in both tables, call the supplied merge function to
- * produce a merged value for the key in the new table.
- * @param p The pool to use for the new hash table
- * @param h1 The first of the tables to merge
- * @param h2 The second of the tables to merge
- * @param merger A callback function to merge values, or NULL to
- * make values from h1 override values from h2 (same semantics as
- * apr_hash_overlay())
- * @param data Client data to pass to the merger function
- * @return A new hash table containing all of the data from the two passed in
- */
-APR_DECLARE(apr_hash_t *) apr_hash_merge(apr_pool_t *p,
- const apr_hash_t *h1,
- const apr_hash_t *h2,
- void * (*merger)(apr_pool_t *p,
- const void *key,
- apr_ssize_t klen,
- const void *h1_val,
- const void *h2_val,
- const void *data),
- const void *data);
-
-/**
- * Get a pointer to the pool which the hash table was created in
- */
-APR_POOL_DECLARE_ACCESSOR(hash);
-
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* !APR_HASH_H */