| // Copyright 2021 The Pigweed Authors |
| // |
| // Licensed 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 |
| // |
| // https://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 dev.pigweed.pw_rpc; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| /** Calculates the service and method IDs. */ |
| /* package */ class Ids { |
| private static final int HASH_CONSTANT = 65599; |
| |
| private Ids() {} |
| |
| public static int calculate(byte[] string) { |
| int hash = string.length; |
| int coefficient = HASH_CONSTANT; |
| |
| for (byte b : string) { |
| hash += coefficient * b; |
| coefficient *= HASH_CONSTANT; |
| } |
| |
| return hash; |
| } |
| |
| public static int calculate(String string) { |
| return calculate(string.getBytes(UTF_8)); |
| } |
| } |