mirror of https://github.com/status-im/op-geth.git
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
|
|
This file is part of cpp-ethereum.
|
|
|
|
cpp-ethereum 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 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file fnv.h
|
|
* @author Matthew Wampler-Doty <negacthulhu@gmail.com>
|
|
* @date 2015
|
|
*/
|
|
|
|
#pragma once
|
|
#include <stdint.h>
|
|
#include "compiler.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define FNV_PRIME 0x01000193
|
|
|
|
/* The FNV-1 spec multiplies the prime with the input one byte (octet) in turn.
|
|
We instead multiply it with the full 32-bit input.
|
|
This gives a different result compared to a canonical FNV-1 implementation.
|
|
*/
|
|
static inline uint32_t fnv_hash(uint32_t const x, uint32_t const y)
|
|
{
|
|
return x * FNV_PRIME ^ y;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|