--- /dev/null
+++ b/src/main/java/abomination/IRegionFile.java
@@ -1,0 +_,39 @@
+package abomination;
+
+import ca.spottedleaf.moonrise.patches.chunk_system.storage.ChunkSystemRegionFile;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.level.ChunkPos;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.file.Path;
+
+public interface IRegionFile extends ChunkSystemRegionFile, AutoCloseable {
+    Path getPath();
+
+    DataInputStream getChunkDataInputStream(ChunkPos pos) throws IOException;
+
+    boolean doesChunkExist(ChunkPos pos) throws Exception;
+
+    DataOutputStream getChunkDataOutputStream(ChunkPos pos) throws IOException;
+
+    void flush() throws IOException;
+
+    void clear(ChunkPos pos) throws IOException;
+
+    boolean hasChunk(ChunkPos pos);
+
+    void close() throws IOException;
+
+    void write(ChunkPos pos, ByteBuffer buf) throws IOException;
+
+    CompoundTag getOversizedData(int x, int z) throws IOException;
+
+    boolean isOversized(int x, int z);
+
+    boolean recalculateHeader() throws IOException;
+
+    void setOversized(int x, int z, boolean oversized) throws IOException;
+}