Worlds

src/main/java/com/volmit/iris/util/IO.java

@@ -21,6 +21,7 @@ import java.io.Reader;
 import java.io.StringWriter;
 import java.io.Writer;
 import java.nio.charset.StandardCharsets;
+import java.security.DigestInputStream;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
@@ -116,6 +117,25 @@ public class IO
 		return "¯\\_(ツ)_/¯";
 	}
 
+	public static String hash(File b)
+	{
+		try
+		{
+			MessageDigest d = MessageDigest.getInstance("SHA-256");
+			DigestInputStream din = new DigestInputStream(new FileInputStream(b), d);
+			fullTransfer(din, new VoidOutputStream(), 8192);
+			din.close();
+			return bytesToHex(din.getMessageDigest().digest());
+		}
+
+		catch(Throwable e)
+		{
+			e.printStackTrace();
+		}
+
+		return "¯\\_(ツ)_/¯";
+	}
+
 	public static String bytesToHex(byte[] bytes)
 	{
 		char[] hexChars = new char[bytes.length * 2];

src/main/java/com/volmit/iris/util/VoidOutputStream.java

@@ -0,0 +1,13 @@
+package com.volmit.iris.util;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class VoidOutputStream extends OutputStream 
+{
+	@Override
+	public void write(int b) throws IOException
+	{
+		// poof
+	}
+}