From 7402ad6be09e02043453292382218e2c9c3da4f6 Mon Sep 17 00:00:00 2001
From: cola98765 <tpodole@gmail.com>
Date: Fri, 29 Oct 2021 13:21:00 +0200
Subject: [PATCH] added getHashFromFile for future use with servers

---
 .../lod/handlers/LodDimensionFileHandler.java | 27 ++++++++++++++-----
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/main/java/com/seibel/lod/handlers/LodDimensionFileHandler.java b/src/main/java/com/seibel/lod/handlers/LodDimensionFileHandler.java
index cc516d922..3da1b286c 100644
--- a/src/main/java/com/seibel/lod/handlers/LodDimensionFileHandler.java
+++ b/src/main/java/com/seibel/lod/handlers/LodDimensionFileHandler.java
@@ -19,12 +19,11 @@
 
 package com.seibel.lod.handlers;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
+import java.io.*;
 import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
+import java.security.MessageDigest;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
@@ -236,9 +235,7 @@ public class LodDimensionFileHandler
 	// Save to File //
 	//==============//
 	
-	/**
-	 * Save all dirty regions in this LodDimension to file.
-	 */
+	/** Save all dirty regions in this LodDimension to file */
 	public void saveDirtyRegionsToFileAsync()
 	{
 		fileWritingThreadPool.execute(saveDirtyRegionsThread);
@@ -376,6 +373,22 @@ public class LodDimensionFileHandler
 	// helper methods //
 	//================//
 	
+	public byte[] getHashFromFile(byte detailLevel, RegionPos regionPos, DistanceGenerationMode generationMode, VerticalQuality verticalQuality)
+	{
+		int regionX = regionPos.x;
+		int regionZ = regionPos.z;
+		String fileName = getFileNameAndPathForRegion(regionX, regionZ, generationMode, detailLevel, verticalQuality);
+		try (InputStream is = Files.newInputStream(Paths.get(fileName))) {
+			return org.apache.commons.codec.digest.DigestUtils.md5(is);
+		}
+		catch (IOException ioEx)
+		{
+			ClientProxy.LOGGER.error("LOD file read error. Unable to read to [" + fileName + "] error [" + ioEx.getMessage() + "]: ");
+			ioEx.printStackTrace();
+		}
+		return new byte[0];
+	}
+	
 	
 	/**
 	 * Return the name of the file that should contain the