1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/**************************************************************************
*
* Copyright 2007 VMware, Inc.
* All Rights Reserved.
*
* 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* @file
* Hash implementation.
*
* This file provides a hash implementation that is capable of dealing
* with collisions. It stores colliding entries in linked list. All
* functions operating on the hash return an iterator. The iterator
* itself points to the collision list. If there wasn't any collision
* the list will have just one entry, otherwise client code should
* iterate over the entries to find the exact entry among ones that
* had the same key (e.g. memcmp could be used on the data to check
* that)
*
* @author Zack Rusin <zackr@vmware.com>
*/
#ifndef UTIL_HASH_H
#define UTIL_HASH_H
#include <stdbool.h>
#include "libdrm_macros.h"
struct util_hash;
struct util_node;
struct util_hash_iter {
struct util_hash *hash;
struct util_node *node;
};
drm_private struct util_hash *util_hash_create(void);
drm_private void util_hash_delete(struct util_hash *hash);
/**
* Adds a data with the given key to the hash. If entry with the given
* key is already in the hash, this current entry is instered before it
* in the collision list.
* Function returns iterator pointing to the inserted item in the hash.
*/
drm_private struct util_hash_iter
util_hash_insert(struct util_hash *hash, unsigned key, void *data);
/**
* Removes the item pointed to by the current iterator from the hash.
* Note that the data itself is not erased and if it was a malloc'ed pointer
* it will have to be freed after calling this function by the callee.
* Function returns iterator pointing to the item after the removed one in
* the hash.
*/
drm_private struct util_hash_iter
util_hash_erase(struct util_hash *hash, struct util_hash_iter iter);
drm_private void *util_hash_take(struct util_hash *hash, unsigned key);
drm_private struct util_hash_iter util_hash_first_node(struct util_hash *hash);
/**
* Return an iterator pointing to the first entry in the collision list.
*/
drm_private struct util_hash_iter
util_hash_find(struct util_hash *hash, unsigned key);
drm_private int util_hash_iter_is_null(struct util_hash_iter iter);
drm_private unsigned util_hash_iter_key(struct util_hash_iter iter);
drm_private void *util_hash_iter_data(struct util_hash_iter iter);
drm_private struct util_hash_iter
util_hash_iter_next(struct util_hash_iter iter);
#endif
|
