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/*
* Copyright © 2009,2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#ifndef _HASH_TABLE_H
#define _HASH_TABLE_H
#include <stdlib.h>
#include <inttypes.h>
#include <stdbool.h>
#include "sqfs/predef.h"
struct hash_entry {
sqfs_u32 hash;
const void *key;
void *data;
};
struct hash_table {
struct hash_entry *table;
sqfs_u32 (*key_hash_function)(const void *key);
bool (*key_equals_function)(const void *a, const void *b);
const void *deleted_key;
sqfs_u32 size;
sqfs_u32 rehash;
sqfs_u64 size_magic;
sqfs_u64 rehash_magic;
sqfs_u32 max_entries;
sqfs_u32 size_index;
sqfs_u32 entries;
sqfs_u32 deleted_entries;
};
SQFS_INTERNAL struct hash_table *
hash_table_create(sqfs_u32 (*key_hash_function)(const void *key),
bool (*key_equals_function)(const void *a,
const void *b));
SQFS_INTERNAL struct hash_table *
hash_table_clone(struct hash_table *src);
SQFS_INTERNAL void
hash_table_destroy(struct hash_table *ht,
void (*delete_function)(struct hash_entry *entry));
SQFS_INTERNAL struct hash_entry *
hash_table_insert_pre_hashed(struct hash_table *ht, sqfs_u32 hash,
const void *key, void *data);
SQFS_INTERNAL struct hash_entry *
hash_table_search_pre_hashed(struct hash_table *ht, sqfs_u32 hash,
const void *key);
SQFS_INTERNAL struct hash_entry *hash_table_next_entry(struct hash_table *ht,
struct hash_entry *entry);
/**
* This foreach function is safe against deletion (which just replaces
* an entry's data with the deleted marker), but not against insertion
* (which may rehash the table, making entry a dangling pointer).
*/
#define hash_table_foreach(ht, entry) \
for (struct hash_entry *entry = hash_table_next_entry(ht, NULL); \
entry != NULL; \
entry = hash_table_next_entry(ht, entry))
#endif /* _HASH_TABLE_H */
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