Here you can find the source of charToOctet(char c)
private static int charToOctet(char c)
//package com.java2s; /*// ww w.j a v a 2 s. c om * Copyright 2007 T-Rank AS * * 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 * * 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. */ public class Main { private static int charToOctet(char c) { if (c > '9') { if (c > 'F') { return c - 'a' + 10; } return c - 'A' + 10; } return c - '0'; } }