From 14f65717642f9cf6c1a9d56820fb9c03ebea2ef2 Mon Sep 17 00:00:00 2001
From: UnfamiliarLegacy <74633542+UnfamiliarLegacy@users.noreply.github.com>
Date: Fri, 28 Jun 2024 17:33:02 +0200
Subject: [PATCH] Fix base64 decoding on Windows 11 arm64

---
 .../java/gearth/encoding/Base64Encoding.java  | 25 ++++++++-----------
 G-Earth/src/test/java/TestBase64Encoding.java | 25 +++++++++++++++++++
 2 files changed, 36 insertions(+), 14 deletions(-)
 create mode 100644 G-Earth/src/test/java/TestBase64Encoding.java

diff --git a/G-Earth/src/main/java/gearth/encoding/Base64Encoding.java b/G-Earth/src/main/java/gearth/encoding/Base64Encoding.java
index ba1812e..02aaaf7 100644
--- a/G-Earth/src/main/java/gearth/encoding/Base64Encoding.java
+++ b/G-Earth/src/main/java/gearth/encoding/Base64Encoding.java
@@ -5,8 +5,6 @@ package gearth.encoding;
  * <a href="https://github.com/Quackster/Kepler">Kepler</a>
  */
 public class Base64Encoding {
-    public byte NEGATIVE = 64;
-    public byte POSITIVE = 65;
 
     public static byte[] encode(int i, int numBytes) {
         byte[] bzRes = new byte[numBytes];
@@ -19,20 +17,19 @@ public class Base64Encoding {
         return bzRes;
     }
 
-    public static int decode(byte[] bzData) {
-        int i = 0;
-        int j = 0;
-        for (int k = bzData.length - 1; k >= 0; k--)
-        {
-            int x = bzData[k] - 0x40;
-            if (j > 0)
-                x *= (int)Math.pow(64.0, (double)j);
+    public static int decode(byte[] data) {
+        int res = 0;
 
-            i += x;
-            j++;
+        for (int k = data.length - 1, i = 0; k >= 0; k--, i++)
+        {
+            int x = data[k] - 0x40;
+            if (i > 0){
+                res += x << (i * 6);
+            } else {
+                res += x;
+            }
         }
 
-        return i;
+        return res;
     }
 }
-
diff --git a/G-Earth/src/test/java/TestBase64Encoding.java b/G-Earth/src/test/java/TestBase64Encoding.java
new file mode 100644
index 0000000..a948e55
--- /dev/null
+++ b/G-Earth/src/test/java/TestBase64Encoding.java
@@ -0,0 +1,25 @@
+import gearth.encoding.Base64Encoding;
+import org.junit.jupiter.api.Test;
+
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TestBase64Encoding {
+
+    @Test
+    public void testBase64Encoding() {
+        testDecode(0, "@@");
+        testDecode(202, "CJ");
+        testDecode(206, "CN");
+        testDecode(277, "DU");
+        testDecode(1337, "@Ty");
+    }
+
+    private void testDecode(int expected, String input) {
+        final byte[] header = input.getBytes(StandardCharsets.ISO_8859_1);
+
+        assertEquals(expected, Base64Encoding.decode(header));
+    }
+
+}
\ No newline at end of file