mirror of
https://github.com/gogf/gf.git
synced 2025-04-05 03:05:05 +08:00
28 lines
834 B
Go
28 lines
834 B
Go
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
|
|
//
|
|
// This Source Code Form is subject to the terms of the MIT License.
|
|
// If a copy of the MIT was not distributed with this file,
|
|
// You can obtain one at https://github.com/gogf/gf.
|
|
|
|
package ghash
|
|
|
|
// SDBM implements the classic SDBM hash algorithm for 32 bits.
|
|
func SDBM(str []byte) uint32 {
|
|
var hash uint32
|
|
for i := 0; i < len(str); i++ {
|
|
// equivalent to: hash = 65599*hash + uint32(str[i]);
|
|
hash = uint32(str[i]) + (hash << 6) + (hash << 16) - hash
|
|
}
|
|
return hash
|
|
}
|
|
|
|
// SDBM64 implements the classic SDBM hash algorithm for 64 bits.
|
|
func SDBM64(str []byte) uint64 {
|
|
var hash uint64
|
|
for i := 0; i < len(str); i++ {
|
|
// equivalent to: hash = 65599*hash + uint32(str[i])
|
|
hash = uint64(str[i]) + (hash << 6) + (hash << 16) - hash
|
|
}
|
|
return hash
|
|
}
|