support the LZ4 compression type, closes #44

build.gradle

@@ -110,6 +110,7 @@ allprojects {
 
         implementation "com.github.ben-manes.caffeine:caffeine:$caffeineVersion"
         implementation "com.github.Querz:NBT:$querzNbtVersion"
+        implementation "org.lz4:lz4-java:1.8.0"
         implementation("com.github.Carleslc.Simple-YAML:Simple-Yaml:$simpleYamlVersion") {
             exclude group: 'org.yaml', module: 'snakeyaml'
         }

core/build.gradle

@@ -44,6 +44,7 @@ shadowJar {
             'io.undertow',
             //'net.kyori', // do not relocate!
             'net.querz',
+            'net.jpountz',
             'org.checkerframework',
             'org.jboss',
             'org.simpleyaml',

core/src/main/java/net/pl3x/map/core/world/Region.java

@@ -30,9 +30,11 @@
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.RandomAccessFile;
 import java.nio.file.Path;
 import java.util.Objects;
+import net.jpountz.lz4.LZ4BlockInputStream;
 import net.pl3x.map.core.Pl3xMap;
 import net.pl3x.map.core.log.Logger;
 import net.querz.mca.CompressionType;
@@ -124,11 +126,14 @@ public void loadChunks() throws IOException {
 
         byte compressionTypeByte = raf.readByte();
         CompressionType compressionType = CompressionType.getFromID(compressionTypeByte);
-        if (compressionType == null) {
+        if (compressionTypeByte != 4 && compressionType == null) {
             throw new IOException("Invalid compression type " + compressionTypeByte);
         }
 
-        DataInputStream dis = new DataInputStream(new BufferedInputStream(compressionType.decompress(new FileInputStream(raf.getFD()))));
+        FileInputStream fileInputStream = new FileInputStream(raf.getFD());
+        // TODO: hotfix until querz' nbt library supports the LZ4 compression type
+        InputStream decompress = compressionTypeByte == 4 ? new LZ4BlockInputStream(fileInputStream) : compressionType.decompress(fileInputStream);
+        DataInputStream dis = new DataInputStream(new BufferedInputStream(decompress));
         NamedTag tag = new NBTInputStream(dis).readTag(Tag.DEFAULT_MAX_DEPTH);
         if (tag != null && tag.getTag() instanceof CompoundTag compoundTag) {
             return this.chunks[index] = Chunk.create(getWorld(), this, compoundTag, index).populate();