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#pragma once
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
Copyright 2014 Michal Schmidt
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "macro.h"
#include "siphash24.h"
typedef void (*hash_func_t)(const void *p, struct siphash *state);
typedef int (*compare_func_t)(const void *a, const void *b);
struct hash_ops {
hash_func_t hash;
compare_func_t compare;
};
void string_hash_func(const void *p, struct siphash *state);
int string_compare_func(const void *a, const void *b) _pure_;
extern const struct hash_ops string_hash_ops;
/* This will compare the passed pointers directly, and will not
* dereference them. This is hence not useful for strings or
* suchlike. */
void trivial_hash_func(const void *p, struct siphash *state);
int trivial_compare_func(const void *a, const void *b) _const_;
extern const struct hash_ops trivial_hash_ops;
/* 32bit values we can always just embed in the pointer itself, but
* in order to support 32bit archs we need store 64bit values
* indirectly, since they don't fit in a pointer. */
void uint64_hash_func(const void *p, struct siphash *state);
int uint64_compare_func(const void *a, const void *b) _pure_;
extern const struct hash_ops uint64_hash_ops;
/* On some archs dev_t is 32bit, and on others 64bit. And sometimes
* it's 64bit on 32bit archs, and sometimes 32bit on 64bit archs. Yuck! */
#if SIZEOF_DEV_T != 8
void devt_hash_func(const void *p, struct siphash *state) _pure_;
int devt_compare_func(const void *a, const void *b) _pure_;
extern const struct hash_ops devt_hash_ops = {
.hash = devt_hash_func,
.compare = devt_compare_func
};
#else
#define devt_hash_func uint64_hash_func
#define devt_compare_func uint64_compare_func
#define devt_hash_ops uint64_hash_ops
#endif
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