blob: ed364695e5fdc031527549ce6d01f43a1f04129c (
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
|
/*
* libdpkg - Debian packaging suite library routines
* strhash.c - FNV string hashing support
*
* Copyright © 2003 Daniel Silverstone <dsilvers@digital-scurf.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <dpkg/string.h>
#define FNV_OFFSET_BASIS 2166136261UL
#define FNV_MIXING_PRIME 16777619UL
/**
* Fowler/Noll/Vo -- FNV-1a simple string hash.
*
* For more info, @see <http://www.isthe.com/chongo/tech/comp/fnv/index.html>.
*
* @param str The string to hash.
*
* @return The hashed value.
*/
unsigned int
str_fnv_hash(const char *str)
{
register unsigned int h = FNV_OFFSET_BASIS;
register unsigned int p = FNV_MIXING_PRIME;
while (*str) {
h ^= *str++;
h *= p;
}
return h;
}
|