sparrow/vendor/github.com/gogf/gf/v2/encoding/ghash/ghash_ap.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

// AP implements the classic AP hash algorithm for 32 bits.
func AP(str []byte) uint32 {
	var hash uint32
	for i := 0; i < len(str); i++ {
		if (i & 1) == 0 {
			hash ^= (hash << 7) ^ uint32(str[i]) ^ (hash >> 3)
		} else {
			hash ^= ^((hash << 11) ^ uint32(str[i]) ^ (hash >> 5)) + 1
		}
	}
	return hash
}

// AP64 implements the classic AP hash algorithm for 64 bits.
func AP64(str []byte) uint64 {
	var hash uint64
	for i := 0; i < len(str); i++ {
		if (i & 1) == 0 {
			hash ^= (hash << 7) ^ uint64(str[i]) ^ (hash >> 3)
		} else {
			hash ^= ^((hash << 11) ^ uint64(str[i]) ^ (hash >> 5)) + 1
		}
	}
	return hash
}