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Allow reading region chunks without loading mca

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This commit is contained in:
Daniel Mills 2021-07-20 02:58:11 -04:00
parent ec4330aea7
commit 60c113b0e8
2 changed files with 34 additions and 0 deletions
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24
src/main/java/com/volmit/iris/engine/data/mca/MCAFile.java
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@ -19,6 +19,9 @@
package com.volmit.iris.engine.data.mca; package com.volmit.iris.engine.data.mca;
import com.volmit.iris.engine.data.nbt.tag.CompoundTag; import com.volmit.iris.engine.data.nbt.tag.CompoundTag;
import com.volmit.iris.engine.hunk.storage.ArrayHunk;
import com.volmit.iris.util.collection.KList;
import com.volmit.iris.util.math.Position2;
import java.io.IOException; import java.io.IOException;
import java.io.RandomAccessFile; import java.io.RandomAccessFile;
@ -88,6 +91,27 @@ public class MCAFile {
} }
} }
public KList<Position2> samplePositions(RandomAccessFile raf) throws IOException {
KList<Position2> p2 = new KList<>();
chunks = new AtomicReferenceArray<>(1024);
int x = 0;
int z = 0;
for (int i = 0; i < 1024; i++) {
x++;
z++;
raf.seek(i * 4);
int offset = raf.read() << 16;
offset |= (raf.read() & 0xFF) << 8;
offset |= raf.read() & 0xFF;
if (raf.readByte() == 0) {
continue;
}
p2.add(new Position2(x & 31, (z / 32) & 31));
}
return p2;
}
public AtomicReferenceArray<Chunk> getChunks() { public AtomicReferenceArray<Chunk> getChunks() {
return chunks; return chunks;
} }

10
src/main/java/com/volmit/iris/engine/data/mca/MCAUtil.java
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@ -18,6 +18,9 @@
package com.volmit.iris.engine.data.mca; package com.volmit.iris.engine.data.mca;
import com.volmit.iris.util.collection.KList;
import com.volmit.iris.util.math.Position2;
import java.io.File; import java.io.File;
import java.io.IOException; import java.io.IOException;
import java.io.RandomAccessFile; import java.io.RandomAccessFile;
@ -83,6 +86,13 @@ public final class MCAUtil {
} }
} }
public static KList<Position2> sampleChunkPositions(File file) throws IOException {
MCAFile mcaFile = newMCAFile(file);
try (RandomAccessFile raf = new RandomAccessFile(file, "r")) {
return mcaFile.samplePositions(raf);
}
}
/** /**
* Calls {@link MCAUtil#write(MCAFile, File, boolean)} without changing the timestamps. * Calls {@link MCAUtil#write(MCAFile, File, boolean)} without changing the timestamps.
* *