package city

import "github.com/go-faster/city"

Package city implements CityHash in go.

Index ¶

• func CH64(s []byte) uint64
• func Hash32(s []byte) uint32
• func Hash64(s []byte) uint64
• func Hash64WithSeed(s []byte, seed uint64) uint64
• func Hash64WithSeeds(s []byte, seed0, seed1 uint64) uint64
• type U128
• func Hash128(s []byte) U128
• func Hash128Seed(s []byte, seed U128) U128
• func (u U128) Append(buf []byte) []byte
• func (u U128) Arr() (v [16]byte)
• func (u U128) String() string

Examples ¶

• Hash128
• Hash32
• Hash64

Functions ¶

func CH64 ¶

func CH64(s []byte) uint64

CH64 returns ClickHouse version of Hash64.

func Hash32 ¶

func Hash32(s []byte) uint32

Hash32 return 32-bit hash.

package main

import (
	"fmt"

	"github.com/go-faster/city"
)

func main() {
	s := []byte("hello")
	hash32 := city.Hash32(s)
	fmt.Printf("the 32-bit hash of 'hello' is: 0x%x\n", hash32)

}

the 32-bit hash of 'hello' is: 0x79969366

func Hash64 ¶

func Hash64(s []byte) uint64

Hash64 return a 64-bit hash.

package main

import (
	"fmt"

	"github.com/go-faster/city"
)

func main() {
	s := []byte("hello")
	hash64 := city.Hash64(s)
	fmt.Printf("the 64-bit hash of 'hello' is: 0x%x\n", hash64)

}

the 64-bit hash of 'hello' is: 0xb48be5a931380ce8

func Hash64WithSeed ¶

func Hash64WithSeed(s []byte, seed uint64) uint64

Hash64WithSeed return a 64-bit hash with a seed.

func Hash64WithSeeds ¶

func Hash64WithSeeds(s []byte, seed0, seed1 uint64) uint64

Hash64WithSeeds return a 64-bit hash with two seeds.

Types ¶

type U128 ¶

type U128 struct {
	Low  uint64 // first 32 bits
	High uint64 // last 32 bits

}

U128 is uint128.

func Hash128 ¶

func Hash128(s []byte) U128

Hash128 returns a 128-bit hash and are tuned for strings of at least a few hundred bytes. Depending on your compiler and hardware, it's likely faster than Hash64() on sufficiently long strings. It's slower than necessary on shorter strings, but we expect that case to be relatively unimportant.

package main

import (
	"fmt"

	"github.com/go-faster/city"
)

func main() {
	fmt.Println(city.Hash128([]byte("hello")))

}

6f72e4abb491a74a65148f580b45f347

func Hash128Seed ¶

func Hash128Seed(s []byte, seed U128) U128

Hash128Seed return a 128-bit hash with a seed.

func (U128) Append ¶

func (u U128) Append(buf []byte) []byte

Append appends uint128 big value to buf in big endian.

Append is much faster that appending Arr result.

func (U128) Arr ¶

func (u U128) Arr() (v [16]byte)

Arr returns byte array that represents uint128 value of U128 in big endian.

func (U128) String ¶

func (u U128) String() string

Source Files ¶

128.go 32.go 64.go ch_64.go doc.go