bench-forgejo/vendor/github.com/syndtr/goleveldb/leveldb/util/hash.go
Thomas Boerger b6a95a8cb3 Integrate public as bindata optionally (#293)
* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix
2016-11-30 00:26:36 +08:00

48 lines
853 B
Go

// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package util
import (
"bytes"
"encoding/binary"
)
// Hash return hash of the given data.
func Hash(data []byte, seed uint32) uint32 {
// Similar to murmur hash
var m uint32 = 0xc6a4a793
var r uint32 = 24
h := seed ^ (uint32(len(data)) * m)
buf := bytes.NewBuffer(data)
for buf.Len() >= 4 {
var w uint32
binary.Read(buf, binary.LittleEndian, &w)
h += w
h *= m
h ^= (h >> 16)
}
rest := buf.Bytes()
switch len(rest) {
default:
panic("not reached")
case 3:
h += uint32(rest[2]) << 16
fallthrough
case 2:
h += uint32(rest[1]) << 8
fallthrough
case 1:
h += uint32(rest[0])
h *= m
h ^= (h >> r)
case 0:
}
return h
}