221 lines
8.0 KiB
Java
221 lines
8.0 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.world.mca.region;
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import com.flowpowered.math.vector.Vector2i;
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import de.bluecolored.bluemap.core.storage.Compression;
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import de.bluecolored.bluemap.core.world.ChunkConsumer;
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import de.bluecolored.bluemap.core.world.Region;
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import de.bluecolored.bluemap.core.world.mca.MCAWorld;
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import de.bluecolored.bluemap.core.world.mca.chunk.MCAChunk;
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import io.airlift.compress.zstd.ZstdInputStream;
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import java.io.*;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.StandardOpenOption;
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/*
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* LinearFormat:
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*
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* REGION-FILE:
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* 8 byte - MAGIC value
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* 1 byte - version
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* 8 byte - region timestamp
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* 1 byte - compression level
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* 2 byte - chunk count
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* 4 byte - data-length in bytes
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* 8 byte - data-hash
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* ? byte - data
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* 8 byte - MAGIC value
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*
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* DATA: (zstd compressed)
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* 32 * 32 * 8 - header:
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* 4 byte - chunk-data-length
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* 4 byte - timestamp
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* ? - chunks
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*
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*/
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public class LinearRegion implements Region {
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public static final String FILE_SUFFIX = ".linear";
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private static final long MAGIC = 0xc3ff13183cca9d9aL;
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private final MCAWorld world;
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private final Path regionFile;
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private final Vector2i regionPos;
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private boolean initialized = false;
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private byte version;
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private long newestTimestamp;
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private byte compressionLevel;
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private short chunkCount;
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private int dataLength;
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private long dataHash;
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private byte[] compressedData;
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public LinearRegion(MCAWorld world, Path regionFile) throws IllegalArgumentException {
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this.world = world;
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this.regionFile = regionFile;
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String[] filenameParts = regionFile.getFileName().toString().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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public LinearRegion(MCAWorld world, Vector2i regionPos) throws IllegalArgumentException {
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this.world = world;
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this.regionPos = regionPos;
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this.regionFile = world.getRegionFolder().resolve(getRegionFileName(regionPos.getX(), regionPos.getY()));
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}
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private synchronized void init() throws IOException {
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if (initialized) return;
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if (Files.notExists(regionFile)) return;
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long fileLength = Files.size(regionFile);
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if (fileLength == 0) return;
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try (
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InputStream in = Files.newInputStream(regionFile, StandardOpenOption.READ);
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BufferedInputStream bIn = new BufferedInputStream(in);
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DataInputStream dIn = new DataInputStream(bIn)
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) {
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if (dIn.readLong() != MAGIC)
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throw new IOException("Linear region-file format: invalid header magic");
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// read the header
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version = dIn.readByte();
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newestTimestamp = dIn.readLong();
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compressionLevel = dIn.readByte();
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chunkCount = dIn.readShort();
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dataLength = dIn.readInt();
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dataHash = dIn.readLong();
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if (version < 1 || version > 2)
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throw new IOException("Linear region-file format: Unsupported version: " + version);
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if (fileLength != dataLength + 40) // 40 = header + footer
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throw new IOException("Linear region-file format: Invalid file length. Expected " + (dataLength + 40) + " but got " + fileLength);
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compressedData = new byte[dataLength];
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dIn.readFully(compressedData, 0, dataLength);
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if (dIn.readLong() != MAGIC)
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throw new IOException("Linear region-file format: invalid footer magic");
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}
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initialized = true;
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}
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@Override
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public void iterateAllChunks(ChunkConsumer consumer) throws IOException {
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if (!initialized) init();
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int chunkStartX = regionPos.getX() * 32;
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int chunkStartZ = regionPos.getY() * 32;
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byte[] chunkDataBuffer = null;
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try (
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InputStream in = new ZstdInputStream(new ByteArrayInputStream(compressedData));
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BufferedInputStream bIn = new BufferedInputStream(in);
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DataInputStream dIn = new DataInputStream(bIn)
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) {
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int[] chunkDataLengths = new int[1024];
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int[] chunkTimestamps = new int[1024];
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for (int i = 0 ; i < 1024 ; i++) {
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chunkDataLengths[i] = dIn.readInt();
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chunkTimestamps[i] = dIn.readInt();
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}
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int i = 0;
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int toBeSkipped = 0;
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for (int z = 0; z < 32; z++) {
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for (int x = 0; x < 32; x++) {
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int length = chunkDataLengths[i];
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if (length > 0) {
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int chunkX = chunkStartX + x;
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int chunkZ = chunkStartZ + z;
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long timestamp = version == 2 ? chunkTimestamps[i] : newestTimestamp;
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if (consumer.filter(chunkX, chunkZ, timestamp)) {
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if (toBeSkipped > 0) skipNBytes(dIn, toBeSkipped);
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if (chunkDataBuffer == null || chunkDataBuffer.length < length)
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chunkDataBuffer = new byte[length];
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dIn.readFully(chunkDataBuffer, 0, length);
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MCAChunk chunk = world.getChunkLoader().load(chunkDataBuffer, 0, length, Compression.NONE);
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consumer.accept(chunkX, chunkZ, chunk);
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} else {
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// skip before reading the next chunk, but only if there is a next chunk
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// that we actually want to read, to avoid decompressing unnecessary data
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toBeSkipped += length;
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}
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}
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i++;
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}
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}
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}
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}
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public static String getRegionFileName(int regionX, int regionZ) {
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return "r." + regionX + "." + regionZ + FILE_SUFFIX;
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}
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/**
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* This method is taken here from a newer version of {@link InputStream},
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* to ensure Java 11 compatibility.
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*/
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private static void skipNBytes(InputStream in, long n) throws IOException {
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while (n > 0) {
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long ns = in.skip(n);
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if (ns > 0 && ns <= n) {
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// adjust number to skip
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n -= ns;
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} else if (ns == 0) { // no bytes skipped
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// read one byte to check for EOS
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if (in.read() == -1) {
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throw new EOFException();
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}
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// one byte read so decrement number to skip
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n--;
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} else { // skipped negative or too many bytes
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throw new IOException("Unable to skip exactly");
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}
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}
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}
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} |