save file handling

src/main/java/com/github/halotroop/litecraft/save/LitecraftSave.java

@@ -1,6 +1,10 @@
 package com.github.halotroop.litecraft.save;
 
-import java.io.File;
+import java.io.*;
+
+import com.github.halotroop.litecraft.world.Chunk;
+
+import tk.valoeghese.sod.BinaryData;
 
 public final class LitecraftSave
 {
@@ -19,9 +23,51 @@ public final class LitecraftSave
 		}
 
 		this.file = saveFile;
+		this.file.mkdirs();
 	}
-	
+
 	private final File file;
 
+	public void saveChunk(Chunk chunk)
+	{
+		StringBuilder fileLocBuilder = new StringBuilder(this.file.getPath())
+				.append('/').append(chunk.chunkX)
+				.append('/').append(chunk.chunkZ);
+		File chunkDir = new File(fileLocBuilder.toString());
+		chunkDir.mkdirs();
+		File chunkFile = new File(fileLocBuilder.append('/').append(chunk.chunkY).append(".sod").toString());
+
+		try
+		{
+			chunkFile.createNewFile();
+
+			BinaryData data = new BinaryData();
+			chunk.write(data);
+			data.write(chunkFile);
+		}
+		catch (IOException e)
+		{
+			e.printStackTrace();
+		}
+	}
+
+	public Chunk readChunk(int chunkX, int chunkY, int chunkZ)
+	{
+		File chunkFile = new File(new StringBuilder(this.file.getPath())
+				.append('/').append(chunkX)
+				.append('/').append(chunkZ)
+				.append('/').append(chunkY).append(".sod").toString());
+
+		if (chunkFile.isFile())
+		{
+			BinaryData data = BinaryData.read(chunkFile);
+
+			Chunk result = new Chunk(chunkX, chunkY, chunkZ);
+			result.read(data);
+			return result;
+		}
+		else return null;
+	}
+
 	private static final String SAVE_DIR = "./saves/";
 }