Code commit

CustomizePlus/Core/Helpers/Base64Helper.cs

@@ -0,0 +1,60 @@
+using System;
+using System.IO;
+using System.IO.Compression;
+using System.Text;
+using Newtonsoft.Json;
+
+namespace CustomizePlus.Core.Helpers;
+
+public static class Base64Helper
+{
+    // Compress any type to a base64 encoding of its compressed json representation, prepended with a version byte.
+    // Returns an empty string on failure.
+    // Original by Ottermandias: OtterGui <3
+    public static unsafe string ExportToBase64<T>(T obj, byte version)
+    {
+        try
+        {
+            var json = JsonConvert.SerializeObject(obj, Formatting.None);
+            var bytes = Encoding.UTF8.GetBytes(json);
+            using var compressedStream = new MemoryStream();
+            using (var zipStream = new GZipStream(compressedStream, CompressionMode.Compress))
+            {
+                zipStream.Write(new ReadOnlySpan<byte>(&version, 1));
+                zipStream.Write(bytes, 0, bytes.Length);
+            }
+
+            return Convert.ToBase64String(compressedStream.ToArray());
+        }
+        catch
+        {
+            return string.Empty;
+        }
+    }
+
+    // Decompress a base64 encoded string to the given type and a prepended version byte if possible.
+    // On failure, data will be String error and version will be byte.MaxValue.
+    // Original by Ottermandias: OtterGui <3
+    public static byte ImportFromBase64(string base64, out string data)
+    {
+        var version = byte.MaxValue;
+        try
+        {
+            var bytes = Convert.FromBase64String(base64);
+            using var compressedStream = new MemoryStream(bytes);
+            using var zipStream = new GZipStream(compressedStream, CompressionMode.Decompress);
+            using var resultStream = new MemoryStream();
+            zipStream.CopyTo(resultStream);
+            bytes = resultStream.ToArray();
+            version = bytes[0];
+            var json = Encoding.UTF8.GetString(bytes, 1, bytes.Length - 1);
+            data = json;
+        }
+        catch
+        {
+            data = "error";
+        }
+
+        return version;
+    }
+}