forked from GeyserMC/Geyser
80 lines
2.7 KiB
Java
80 lines
2.7 KiB
Java
/*
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* Copyright (c) 2019-2021 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Geyser
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*/
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package org.geysermc.connector.utils;
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import org.geysermc.connector.GeyserConnector;
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import java.nio.charset.StandardCharsets;
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public class PluginMessageUtils {
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private static final byte[] BRAND_DATA;
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static {
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byte[] data = GeyserConnector.NAME.getBytes(StandardCharsets.UTF_8);
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byte[] varInt = writeVarInt(data.length);
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BRAND_DATA = new byte[varInt.length + data.length];
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System.arraycopy(varInt, 0, BRAND_DATA, 0, varInt.length);
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System.arraycopy(data, 0, BRAND_DATA, varInt.length, data.length);
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}
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/**
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* Get the prebuilt brand as a byte array
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* @return the brand information of the Geyser client
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*/
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public static byte[] getGeyserBrandData() {
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return BRAND_DATA;
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}
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private static byte[] writeVarInt(int value) {
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byte[] data = new byte[getVarIntLength(value)];
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int index = 0;
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do {
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byte temp = (byte)(value & 0b01111111);
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value >>>= 7;
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if (value != 0) {
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temp |= 0b10000000;
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}
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data[index] = temp;
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index++;
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} while (value != 0);
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return data;
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}
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private static int getVarIntLength(int number) {
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if ((number & 0xFFFFFF80) == 0) {
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return 1;
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} else if ((number & 0xFFFFC000) == 0) {
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return 2;
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} else if ((number & 0xFFE00000) == 0) {
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return 3;
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} else if ((number & 0xF0000000) == 0) {
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return 4;
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}
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return 5;
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}
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}
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