mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-18 22:40:50 +00:00
74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
|
// metrohash.h
|
||
|
|
//
|
||
|
|
// The MIT License (MIT)
|
||
|
|
//
|
||
|
|
// Copyright (c) 2015 J. Andrew Rogers
|
||
|
|
//
|
||
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
// of this software and associated documentation files (the "Software"), to deal
|
||
|
|
// in the Software without restriction, including without limitation the rights
|
||
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
// copies of the Software, and to permit persons to whom the Software is
|
||
|
|
// furnished to do so, subject to the following conditions:
|
||
|
|
//
|
||
|
|
// The above copyright notice and this permission notice shall be included in all
|
||
|
|
// copies or substantial portions of the Software.
|
||
|
|
//
|
||
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
// SOFTWARE.
|
||
|
|
//
|
||
|
|
|
||
|
|
#ifndef METROHASH_METROHASH_H
|
||
|
|
#define METROHASH_METROHASH_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
// MetroHash 64-bit hash functions
|
||
|
|
void metrohash64_1(const uint8_t * key, uint64_t len, uint32_t seed, uint8_t * out);
|
||
|
|
void metrohash64_2(const uint8_t * key, uint64_t len, uint32_t seed, uint8_t * out);
|
||
|
|
|
||
|
|
// MetroHash 128-bit hash functions
|
||
|
|
void metrohash128_1(const uint8_t * key, uint64_t len, uint32_t seed, uint8_t * out);
|
||
|
|
void metrohash128_2(const uint8_t * key, uint64_t len, uint32_t seed, uint8_t * out);
|
||
|
|
|
||
|
|
// MetroHash 128-bit hash functions using CRC instruction
|
||
|
|
void metrohash128crc_1(const uint8_t * key, uint64_t len, uint32_t seed, uint8_t * out);
|
||
|
|
void metrohash128crc_2(const uint8_t * key, uint64_t len, uint32_t seed, uint8_t * out);
|
||
|
|
|
||
|
|
|
||
|
|
/* rotate right idiom recognized by compiler*/
|
||
|
|
inline static uint64_t rotate_right(uint64_t v, unsigned k)
|
||
|
|
{
|
||
|
|
return (v >> k) | (v << (64 - k));
|
||
|
|
}
|
||
|
|
|
||
|
|
// unaligned reads, fast and safe on Nehalem and later microarchitectures
|
||
|
|
inline static uint64_t read_u64(const void * const ptr)
|
||
|
|
{
|
||
|
|
return static_cast<uint64_t>(*reinterpret_cast<const uint64_t*>(ptr));
|
||
|
|
}
|
||
|
|
|
||
|
|
inline static uint64_t read_u32(const void * const ptr)
|
||
|
|
{
|
||
|
|
return static_cast<uint64_t>(*reinterpret_cast<const uint32_t*>(ptr));
|
||
|
|
}
|
||
|
|
|
||
|
|
inline static uint64_t read_u16(const void * const ptr)
|
||
|
|
{
|
||
|
|
return static_cast<uint64_t>(*reinterpret_cast<const uint16_t*>(ptr));
|
||
|
|
}
|
||
|
|
|
||
|
|
inline static uint64_t read_u8 (const void * const ptr)
|
||
|
|
{
|
||
|
|
return static_cast<uint64_t>(*reinterpret_cast<const uint8_t *>(ptr));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif // #ifndef METROHASH_METROHASH_H
|