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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
758dd67e LP |
2 | #pragma once |
3 | ||
4 | /*** | |
5 | This file is part of systemd. | |
6 | ||
7 | Copyright 2010 Lennart Poettering | |
8 | Copyright 2014 Michal Schmidt | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | ***/ | |
23 | ||
24 | #include "macro.h" | |
25 | #include "siphash24.h" | |
26 | ||
27 | typedef void (*hash_func_t)(const void *p, struct siphash *state); | |
28 | typedef int (*compare_func_t)(const void *a, const void *b); | |
29 | ||
30 | struct hash_ops { | |
31 | hash_func_t hash; | |
32 | compare_func_t compare; | |
33 | }; | |
34 | ||
35 | void string_hash_func(const void *p, struct siphash *state); | |
36 | int string_compare_func(const void *a, const void *b) _pure_; | |
37 | extern const struct hash_ops string_hash_ops; | |
38 | ||
39 | /* This will compare the passed pointers directly, and will not | |
40 | * dereference them. This is hence not useful for strings or | |
41 | * suchlike. */ | |
42 | void trivial_hash_func(const void *p, struct siphash *state); | |
43 | int trivial_compare_func(const void *a, const void *b) _const_; | |
44 | extern const struct hash_ops trivial_hash_ops; | |
45 | ||
46 | /* 32bit values we can always just embed in the pointer itself, but | |
47 | * in order to support 32bit archs we need store 64bit values | |
48 | * indirectly, since they don't fit in a pointer. */ | |
49 | void uint64_hash_func(const void *p, struct siphash *state); | |
50 | int uint64_compare_func(const void *a, const void *b) _pure_; | |
51 | extern const struct hash_ops uint64_hash_ops; | |
52 | ||
53 | /* On some archs dev_t is 32bit, and on others 64bit. And sometimes | |
54 | * it's 64bit on 32bit archs, and sometimes 32bit on 64bit archs. Yuck! */ | |
55 | #if SIZEOF_DEV_T != 8 | |
56 | void devt_hash_func(const void *p, struct siphash *state) _pure_; | |
57 | int devt_compare_func(const void *a, const void *b) _pure_; | |
58 | extern const struct hash_ops devt_hash_ops = { | |
59 | .hash = devt_hash_func, | |
60 | .compare = devt_compare_func | |
61 | }; | |
62 | #else | |
63 | #define devt_hash_func uint64_hash_func | |
64 | #define devt_compare_func uint64_compare_func | |
65 | #define devt_hash_ops uint64_hash_ops | |
66 | #endif |