142 lines
5.4 KiB
Java
142 lines
5.4 KiB
Java
/*
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* This file is part of BlueMap, licensed under the MIT License (MIT).
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*
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* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
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* Copyright (c) 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
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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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package de.bluecolored.bluemap.core.mca;
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import com.flowpowered.math.vector.Vector2i;
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import de.bluecolored.bluemap.core.logger.Logger;
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import de.bluecolored.bluemap.core.world.Chunk;
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import de.bluecolored.bluemap.core.world.EmptyChunk;
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import de.bluecolored.bluemap.core.world.Region;
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import net.querz.nbt.CompoundTag;
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import net.querz.nbt.Tag;
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import net.querz.nbt.mca.CompressionType;
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import java.io.*;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.List;
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public class MCARegion implements Region {
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private final MCAWorld world;
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private final File regionFile;
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private final Vector2i regionPos;
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public MCARegion(MCAWorld world, File regionFile) throws IllegalArgumentException {
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this.world = world;
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this.regionFile = regionFile;
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String[] filenameParts = regionFile.getName().split("\\.");
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int rX = Integer.parseInt(filenameParts[1]);
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int rZ = Integer.parseInt(filenameParts[2]);
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this.regionPos = new Vector2i(rX, rZ);
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}
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@Override
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public Chunk loadChunk(int chunkX, int chunkZ, boolean ignoreMissingLightData) throws IOException {
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if (!regionFile.exists() || regionFile.length() == 0) return EmptyChunk.INSTANCE;
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try (RandomAccessFile raf = new RandomAccessFile(regionFile, "r")) {
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int xzChunk = Math.floorMod(chunkZ, 32) * 32 + Math.floorMod(chunkX, 32);
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raf.seek(xzChunk * 4L);
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int offset = raf.read() << 16;
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offset |= (raf.read() & 0xFF) << 8;
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offset |= raf.read() & 0xFF;
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offset *= 4096;
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int size = raf.readByte() * 4096;
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if (size == 0) {
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return EmptyChunk.INSTANCE;
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}
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raf.seek(offset + 4); // +4 skip chunk size
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byte compressionTypeByte = raf.readByte();
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CompressionType compressionType = CompressionType.getFromID(compressionTypeByte);
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if (compressionType == null) {
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throw new IOException("Invalid compression type " + compressionTypeByte);
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}
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DataInputStream dis = new DataInputStream(new BufferedInputStream(compressionType.decompress(new FileInputStream(raf.getFD()))));
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Tag<?> tag = Tag.deserialize(dis, Tag.DEFAULT_MAX_DEPTH);
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if (tag instanceof CompoundTag) {
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MCAChunk chunk = MCAChunk.create(world, (CompoundTag) tag);
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if (!chunk.isGenerated()) return EmptyChunk.INSTANCE;
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return chunk;
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} else {
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throw new IOException("Invalid data tag: " + (tag == null ? "null" : tag.getClass().getName()));
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}
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} catch (RuntimeException e) {
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throw new IOException(e);
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}
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}
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@Override
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public Collection<Vector2i> listChunks(long modifiedSince) {
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if (!regionFile.exists() || regionFile.length() == 0) return Collections.emptyList();
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List<Vector2i> chunks = new ArrayList<>(1024); //1024 = 32 x 32 chunks per region-file
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try (RandomAccessFile raf = new RandomAccessFile(regionFile, "r")) {
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for (int x = 0; x < 32; x++) {
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for (int z = 0; z < 32; z++) {
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Vector2i chunk = new Vector2i(regionPos.getX() * 32 + x, regionPos.getY() * 32 + z);
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int xzChunk = z * 32 + x;
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raf.seek(xzChunk * 4 + 3);
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int size = raf.readByte() * 4096;
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if (size == 0) continue;
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raf.seek(xzChunk * 4 + 4096);
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int timestamp = raf.read() << 24;
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timestamp |= (raf.read() & 0xFF) << 16;
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timestamp |= (raf.read() & 0xFF) << 8;
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timestamp |= raf.read() & 0xFF;
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if (timestamp >= (modifiedSince / 1000)) {
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chunks.add(chunk);
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}
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}
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}
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} catch (RuntimeException | IOException ex) {
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Logger.global.logWarning("Failed to read .mca file: " + regionFile.getAbsolutePath() + " (" + ex + ")");
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}
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return chunks;
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}
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@Override
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public File getRegionFile() {
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return regionFile;
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}
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}
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