diff options
Diffstat (limited to 'vendor/github.com/ethereum/ethash/src/libethash/fnv.h')
-rw-r--r-- | vendor/github.com/ethereum/ethash/src/libethash/fnv.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/vendor/github.com/ethereum/ethash/src/libethash/fnv.h b/vendor/github.com/ethereum/ethash/src/libethash/fnv.h new file mode 100644 index 000000000..82cd655c4 --- /dev/null +++ b/vendor/github.com/ethereum/ethash/src/libethash/fnv.h @@ -0,0 +1,43 @@ +/* + 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 |