Java tutorial
/** * Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior * University * * 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. **/ package com.ltln.modules.openflow.core.util; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.Arrays; import io.netty.buffer.ByteBuf; public class StringByteSerializer { public static String readFrom(final ByteBuf data, final int length) { byte[] stringBytes = new byte[length]; data.readBytes(stringBytes); // find the first index of 0 int index = 0; for (byte b : stringBytes) { if (0 == b) break; ++index; } return new String(Arrays.copyOf(stringBytes, index), Charset.forName("ascii")); } public static void writeTo(final ByteBuf data, final int length, final String value) { try { byte[] name = value.getBytes("ASCII"); if (name.length < length) { data.writeBytes(name); for (int i = name.length; i < length; ++i) { data.writeByte((byte) 0); } } else { data.writeBytes(name, 0, length - 1); data.writeByte((byte) 0); } } catch (UnsupportedEncodingException e) { throw new RuntimeException(e); } } }