115 lines
4.6 KiB
Java
115 lines
4.6 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2021 ViaVersion and contributors
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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 all
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* 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 THE
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* SOFTWARE.
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*/
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package com.viaversion.viaversion.api.type.types.version;
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import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
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import com.viaversion.viaversion.api.type.Type;
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import com.viaversion.viaversion.util.CompactArrayUtil;
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import io.netty.buffer.ByteBuf;
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public class ChunkSectionType1_9 extends Type<ChunkSection> {
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private static final int GLOBAL_PALETTE = 13;
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public ChunkSectionType1_9() {
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super("Chunk Section Type", ChunkSection.class);
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}
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@Override
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public ChunkSection read(ByteBuf buffer) throws Exception {
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// Reaad bits per block
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int bitsPerBlock = buffer.readUnsignedByte();
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int originalBitsPerBlock = bitsPerBlock;
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if (bitsPerBlock == 0) {
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bitsPerBlock = GLOBAL_PALETTE;
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}
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if (bitsPerBlock < 4) {
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bitsPerBlock = 4;
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}
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if (bitsPerBlock > 8) {
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bitsPerBlock = GLOBAL_PALETTE;
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}
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// Read palette
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int paletteLength = Type.VAR_INT.readPrimitive(buffer);
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ChunkSection chunkSection = bitsPerBlock != GLOBAL_PALETTE ? new ChunkSection(paletteLength) : new ChunkSection();
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for (int i = 0; i < paletteLength; i++) {
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if (bitsPerBlock != GLOBAL_PALETTE) {
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chunkSection.addPaletteEntry(Type.VAR_INT.readPrimitive(buffer));
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} else {
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Type.VAR_INT.readPrimitive(buffer);
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}
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}
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// Read blocks
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long[] blockData = new long[Type.VAR_INT.readPrimitive(buffer)];
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if (blockData.length > 0) {
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int expectedLength = (int) Math.ceil(ChunkSection.SIZE * bitsPerBlock / 64.0);
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if (blockData.length != expectedLength) {
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throw new IllegalStateException("Block data length (" + blockData.length + ") does not match expected length (" + expectedLength + ")! bitsPerBlock=" + bitsPerBlock + ", originalBitsPerBlock=" + originalBitsPerBlock);
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}
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for (int i = 0; i < blockData.length; i++) {
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blockData[i] = buffer.readLong();
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}
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CompactArrayUtil.iterateCompactArray(bitsPerBlock, ChunkSection.SIZE, blockData,
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bitsPerBlock == GLOBAL_PALETTE ? chunkSection::setFlatBlock
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: chunkSection::setPaletteIndex);
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}
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return chunkSection;
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}
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@Override
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public void write(ByteBuf buffer, ChunkSection chunkSection) throws Exception {
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int bitsPerBlock = 4;
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while (chunkSection.getPaletteSize() > 1 << bitsPerBlock) {
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bitsPerBlock += 1;
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}
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if (bitsPerBlock > 8) {
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bitsPerBlock = GLOBAL_PALETTE;
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}
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long maxEntryValue = (1L << bitsPerBlock) - 1;
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buffer.writeByte(bitsPerBlock);
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// Write pallet (or not)
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if (bitsPerBlock != GLOBAL_PALETTE) {
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Type.VAR_INT.writePrimitive(buffer, chunkSection.getPaletteSize());
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for (int i = 0; i < chunkSection.getPaletteSize(); i++) {
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Type.VAR_INT.writePrimitive(buffer, chunkSection.getPaletteEntry(i));
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}
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} else {
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Type.VAR_INT.writePrimitive(buffer, 0);
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}
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long[] data = CompactArrayUtil.createCompactArray(bitsPerBlock, ChunkSection.SIZE,
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bitsPerBlock == GLOBAL_PALETTE ? chunkSection::getFlatBlock : chunkSection::getPaletteIndex);
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Type.VAR_INT.writePrimitive(buffer, data.length);
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for (long l : data) {
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buffer.writeLong(l);
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}
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}
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}
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