Java tutorial
/* * MIT License * * Copyright (c) 2016 Asynchronous Game Query Library * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.ibasco.agql.core.utils; import io.netty.buffer.ByteBuf; import io.netty.util.CharsetUtil; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.nio.charset.Charset; public class ByteBufUtils { private static final Logger log = LoggerFactory.getLogger(ByteBufUtils.class); public static String readString(ByteBuf buffer) { return readString(buffer, CharsetUtil.ISO_8859_1, false, null); } public static String readString(ByteBuf buffer, Charset encoding) { return readString(buffer, encoding, false); } public static String readString(ByteBuf buffer, Charset encoding, boolean readNonNullTerminated) { return readString(buffer, encoding, readNonNullTerminated, null); } public static String readString(ByteBuf buffer, Charset encoding, boolean readNonNullTerminated, String defaultString) { int length = buffer.bytesBefore((byte) 0); if (length < 0) { if (readNonNullTerminated && buffer.readableBytes() > 0) length = buffer.readableBytes(); else return null; } String data = buffer.readCharSequence(length, encoding).toString(); //Discard the null terminator (if available) if (buffer.readableBytes() > 2 && buffer.getByte(buffer.readerIndex()) == 0) buffer.readByte(); return data; } public static String readStringToEnd(ByteBuf buffer, Charset encoding) { int length = buffer.readableBytes(); if (length > 0) return buffer.readCharSequence(length, encoding).toString(); return null; } }