gf/encoding/ghash/ghash_sdbm.go
2022-01-13 21:31:23 +08:00

28 lines
842 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 = 0
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 = 0
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
}