From 3b8d7f1316405978959ec812ce6139227a09ab76 Mon Sep 17 00:00:00 2001
From: yoyosource <yoyosource@nidido.de>
Date: Mon, 24 May 2021 22:46:51 +0200
Subject: [PATCH] Add new BauGuiImportExport.exportGui

Signed-off-by: yoyosource <yoyosource@nidido.de>
---
 .../gui/editor/BauGuiImportExport.java        | 71 +++++++++++++++----
 1 file changed, 58 insertions(+), 13 deletions(-)

diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/gui/editor/BauGuiImportExport.java b/BauSystem_Main/src/de/steamwar/bausystem/features/gui/editor/BauGuiImportExport.java
index 2f1a3fd4..d8aa5f5f 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/gui/editor/BauGuiImportExport.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/gui/editor/BauGuiImportExport.java
@@ -21,31 +21,76 @@ package de.steamwar.bausystem.features.gui.editor;
 
 import de.steamwar.bausystem.BauSystem;
 import de.steamwar.bausystem.features.gui.BauGUI;
+import lombok.experimental.UtilityClass;
 import org.bukkit.entity.Player;
 
-import java.util.Base64;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.*;
+import java.util.stream.Collectors;
 
+@UtilityClass
 public class BauGuiImportExport {
 
-    public static String exportGui(BauGuiMapping mapping) {
+    public String exportGui(BauGuiMapping mapping) {
+        StringBuilder st = new StringBuilder();
+        st.append("00000"); // Version in Binary (0 - 32)
+        append(st, Integer.toBinaryString(mapping.getSize() / 9), 3); // Menu Size
 
-        byte[] bytes = new byte[(mapping.getMapping().size() * 2) + 1];
-        Map<Integer, Integer> map = mapping.getMapping();
+        Map<Integer, Integer> map = new HashMap<>();
+        mapping.getMapping().forEach((integer, integer2) -> {
+            map.put(integer2, integer);
+        });
 
-        int head = 0;
-        for (Map.Entry<Integer, Integer> e : map.entrySet()) {
-            bytes[head] = e.getKey().byteValue();
-            head++;
-            bytes[head] = e.getValue().byteValue();
-            head++;
+        List<Integer> integerList = map.keySet().stream().sorted().collect(Collectors.toList());
+        for (int i = 0; i < integerList.size(); i++) {
+            int current = integerList.get(i);
+            int last = 0;
+            if (i != 0) {
+                last = integerList.get(i - 1);
+            }
+            if (current - last > 1) {
+                binaryConvert(st, Integer.toBinaryString(current - last), 3, '0');
+            }
+            binaryConvert(st, Integer.toBinaryString(map.get(current)), 4, '1');
+        }
+
+        byte[] bytes = new byte[st.length() / 8 + 1];
+        if (st.length() / 8 == (int) Math.ceil(st.length() / 8.0)) {
+            bytes = new byte[st.length() / 8];
+        }
+
+        int index = 0;
+        while (st.length() > 8) {
+            byte result = 0;
+            for (int i = 0; i < Math.min(8, st.length()); i++) {
+                result |= (st.charAt(i) - '0') << (7 - i);
+            }
+            bytes[index] = result;
+            index++;
+            st.delete(0, 8);
         }
-        bytes[head] = (byte) mapping.getSize();
 
         return Base64.getEncoder().encodeToString(bytes);
     }
 
+    private static void append(StringBuilder st, String s, int length) {
+        for (int i = 0; i < length - s.length(); i++) {
+            st.append("0");
+        }
+        st.append(s);
+    }
+
+    private static void binaryConvert(StringBuilder st, String s, int bitlet, char c) {
+        StringBuilder current = new StringBuilder(s);
+        while (current.length() % bitlet != 0) {
+            current.insert(0, '0');
+        }
+        while (current.length() > bitlet) {
+            st.append(c).append(current.substring(0, bitlet));
+            current.delete(0, bitlet);
+        }
+        st.append(c).append(current);
+    }
+
     public static boolean importGui(String str, Player p) {
         byte[] bytes = Base64.getDecoder().decode(str);
         if (bytes.length % 2 != 1 || bytes.length < 2) {