Java tutorial
/* * This file is part of Spoutcraft (http://www.spout.org/). * * Spoutcraft is licensed under the SpoutDev License Version 1. * * Spoutcraft is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * In addition, 180 days after any changes are published, you can use the * software, incorporating those changes, under the terms of the MIT license, * as described in the SpoutDev License Version 1. * * Spoutcraft is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License, * the MIT license and the SpoutDev license version 1 along with this program. * If not, see <http://www.gnu.org/licenses/> for the GNU Lesser General Public * License and see <http://www.spout.org/SpoutDevLicenseV1.txt> for the full license, * including the MIT license. */ package org.spoutcraft.client.packet; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.util.List; import java.util.UUID; import java.util.zip.DataFormatException; import java.util.zip.Deflater; import java.util.zip.Inflater; import org.apache.commons.io.output.ByteArrayOutputStream; import net.minecraft.client.Minecraft; import net.minecraft.src.WorldClient; import org.spoutcraft.client.SpoutClient; import org.spoutcraft.spoutcraftapi.entity.Entity; public class PacketEntityInformation implements CompressablePacket { private boolean compressed = false; private byte[] data = null; public PacketEntityInformation() { } public PacketEntityInformation(List<Entity> entities) { ByteBuffer tempbuffer = ByteBuffer.allocate(entities.size() * 4); for (Entity e : entities) { tempbuffer.putInt(e.getEntityId()); } data = tempbuffer.array(); } public int getNumBytes() { return 1 + (data != null ? data.length : 0) + 4; } public void readData(DataInputStream input) throws IOException { int size = input.readInt(); if (size > 0) { data = new byte[size]; input.readFully(data); } compressed = input.readBoolean(); } public void writeData(DataOutputStream output) throws IOException { if (data != null) { output.writeInt(data.length); output.write(data); } else { output.writeInt(0); } output.writeBoolean(compressed); } public void run(int playerId) { if (Minecraft.theMinecraft.theWorld instanceof WorldClient) { ByteBuffer rawData = ByteBuffer.allocate(data.length); rawData.put(data); for (int i = 0; i < data.length / 20; i++) { int index = i * 20; long lsb = rawData.getLong(index); long msb = rawData.getLong(index + 8); int id = rawData.getInt(index + 16); net.minecraft.src.Entity e = SpoutClient.getInstance().getEntityFromId(id); if (e != null) { e.uniqueId = new UUID(msb, lsb); } } } } public void failure(int playerId) { } public PacketType getPacketType() { return PacketType.PacketEntityInformation; } public int getVersion() { return 0; } public void compress() { if (!compressed) { if (data != null) { Deflater deflater = new Deflater(); deflater.setInput(data); deflater.setLevel(Deflater.BEST_COMPRESSION); deflater.finish(); ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length); byte[] buffer = new byte[1024]; while (!deflater.finished()) { int bytesCompressed = deflater.deflate(buffer); bos.write(buffer, 0, bytesCompressed); } try { bos.close(); } catch (IOException e) { e.printStackTrace(); } data = bos.toByteArray(); } compressed = true; } } public void decompress() { if (compressed) { Inflater decompressor = new Inflater(); decompressor.setInput(data); ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length); byte[] buf = new byte[1024]; while (!decompressor.finished()) { try { int count = decompressor.inflate(buf); bos.write(buf, 0, count); } catch (DataFormatException e) { } } try { bos.close(); } catch (IOException e) { } data = bos.toByteArray(); } } public boolean isCompressed() { return compressed; } }