blob: 3d74db2cddcef2274841969026c7abd3baa793c8 (
plain)
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
|
/* EINA - EFL data type library
* Copyright (C) 2002-2008 Carsten Haitzler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library;
* if not, see <https://www.gnu.org/licenses/>.
*/
#ifndef EINA_INLINE_HASH_X_
#define EINA_INLINE_HASH_X_
/*
djb2 hash algorithm was first reported by dan bernstein, and was the old
default hash function for evas.
*/
static inline int
eina_hash_djb2(const char *key, int len)
{
unsigned int hash_num = 5381;
const unsigned char *ptr;
if (!key) return 0;
for (ptr = (unsigned char *)key; len; ptr++, len--)
hash_num = ((hash_num << 5) + hash_num) ^ *ptr; /* hash * 33 ^ c */
return (int)hash_num;
}
static inline int
eina_hash_djb2_len(const char *key, int *plen)
{
unsigned int hash_num = 5381;
int len = 0;
const unsigned char *ptr;
if (!key) return 0;
for (ptr = (unsigned char *)key; *ptr; ptr++, len++)
hash_num = ((hash_num << 5) + hash_num) ^ *ptr; /* hash * 33 ^ c */
*plen = len + 1;
return (int)hash_num;
}
static inline int
eina_hash_int32(const unsigned int *pkey, int len)
{
unsigned int key = *pkey;
(void) len;
key = ~key + (key << 15);
key = key ^ (key >> 12);
key = key + (key << 2);
key = key ^ (key >> 4);
key = key * 2057;
key = key ^ (key >> 16);
return key;
}
static inline int
eina_hash_int64(const unsigned long int *pkey, int len)
{
unsigned long int key = *pkey;
(void) len;
key = (~key) + (key << 18);
key = key ^ (key >> 31);
key = key * 21;
key = key ^ (key >> 11);
key = key + (key << 6);
key = key ^ (key >> 22);
return (int) key;
}
#endif
|
