]>
Commit | Line | Data |
---|---|---|
758dd67e LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | #pragma once | |
4 | ||
5 | /*** | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2010 Lennart Poettering | |
9 | Copyright 2014 Michal Schmidt | |
10 | ||
11 | systemd is free software; you can redistribute it and/or modify it | |
12 | under the terms of the GNU Lesser General Public License as published by | |
13 | the Free Software Foundation; either version 2.1 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | systemd is distributed in the hope that it will be useful, but | |
17 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | Lesser General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU Lesser General Public License | |
22 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
23 | ***/ | |
24 | ||
25 | #include "macro.h" | |
26 | #include "siphash24.h" | |
27 | ||
28 | typedef void (*hash_func_t)(const void *p, struct siphash *state); | |
29 | typedef int (*compare_func_t)(const void *a, const void *b); | |
30 | ||
31 | struct hash_ops { | |
32 | hash_func_t hash; | |
33 | compare_func_t compare; | |
34 | }; | |
35 | ||
36 | void string_hash_func(const void *p, struct siphash *state); | |
37 | int string_compare_func(const void *a, const void *b) _pure_; | |
38 | extern const struct hash_ops string_hash_ops; | |
39 | ||
40 | /* This will compare the passed pointers directly, and will not | |
41 | * dereference them. This is hence not useful for strings or | |
42 | * suchlike. */ | |
43 | void trivial_hash_func(const void *p, struct siphash *state); | |
44 | int trivial_compare_func(const void *a, const void *b) _const_; | |
45 | extern const struct hash_ops trivial_hash_ops; | |
46 | ||
47 | /* 32bit values we can always just embed in the pointer itself, but | |
48 | * in order to support 32bit archs we need store 64bit values | |
49 | * indirectly, since they don't fit in a pointer. */ | |
50 | void uint64_hash_func(const void *p, struct siphash *state); | |
51 | int uint64_compare_func(const void *a, const void *b) _pure_; | |
52 | extern const struct hash_ops uint64_hash_ops; | |
53 | ||
54 | /* On some archs dev_t is 32bit, and on others 64bit. And sometimes | |
55 | * it's 64bit on 32bit archs, and sometimes 32bit on 64bit archs. Yuck! */ | |
56 | #if SIZEOF_DEV_T != 8 | |
57 | void devt_hash_func(const void *p, struct siphash *state) _pure_; | |
58 | int devt_compare_func(const void *a, const void *b) _pure_; | |
59 | extern const struct hash_ops devt_hash_ops = { | |
60 | .hash = devt_hash_func, | |
61 | .compare = devt_compare_func | |
62 | }; | |
63 | #else | |
64 | #define devt_hash_func uint64_hash_func | |
65 | #define devt_compare_func uint64_compare_func | |
66 | #define devt_hash_ops uint64_hash_ops | |
67 | #endif |