| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You under the Apache License, Version 2.0 |
| // (the "License"); you may not use this file except in compliance with |
| // the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package id |
| |
| import ( |
| "fmt" |
| "hash/crc32" |
| "reflect" |
| "unsafe" |
| ) |
| |
| // GenID generates an ID according to the raw material. |
| func GenID(raw string) string { |
| if raw == "" { |
| return "" |
| } |
| sh := &reflect.SliceHeader{ |
| Data: (*reflect.StringHeader)(unsafe.Pointer(&raw)).Data, |
| Len: len(raw), |
| Cap: len(raw), |
| } |
| p := *(*[]byte)(unsafe.Pointer(sh)) |
| |
| res := crc32.ChecksumIEEE(p) |
| return fmt.Sprintf("%x", res) |
| } |