From f7de7bd430acec842875c50482d580f4b967e235 Mon Sep 17 00:00:00 2001
From: "Namhyeon, Go" <gnh1201@gmail.com>
Date: Sun, 6 Apr 2025 15:23:19 +0900
Subject: [PATCH] Add Cache Compression

---
 .../WelsonJS.Launcher/ResourceServer.cs       | 43 ++++++++++++++++++-
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs
index 02f3e0b..71c28e6 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/ResourceServer.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.IO.Compression;
 using System.Net;
 using System.Net.Http;
 using System.Reflection;
@@ -213,7 +214,15 @@ namespace WelsonJS.Launcher
             {
                 if (File.Exists(cachePath))
                 {
-                    data = File.ReadAllBytes(cachePath);
+                    byte[] raw = File.ReadAllBytes(cachePath);
+
+                    if (isMetadata)
+                    {
+                        data = raw;
+                        return true;
+                    }
+
+                    data = IsCompressed(raw) ? Decompress(raw) : raw;
                     return true;
                 }
             }
@@ -255,7 +264,8 @@ namespace WelsonJS.Launcher
                 }
 
                 // Save the cache
-                File.WriteAllBytes(cachePath, data);
+                byte[] compressed = Compress(data);
+                File.WriteAllBytes(cachePath, compressed);
 
                 // Save the cache meta
                 File.WriteAllBytes($"{cachePath}.meta", Encoding.UTF8.GetBytes(mimeType));
@@ -360,5 +370,34 @@ namespace WelsonJS.Launcher
                 return memoryStream.ToArray();
             }
         }
+
+        private byte[] Compress(byte[] data)
+        {
+            using (var output = new MemoryStream())
+            {
+                using (var gzip = new GZipStream(output, CompressionMode.Compress))
+                {
+                    gzip.Write(data, 0, data.Length);
+                }
+                return output.ToArray(); // includes GZip signature
+            }
+        }
+
+        private byte[] Decompress(byte[] data)
+        {
+            using (var input = new MemoryStream(data))
+            using (var gzip = new GZipStream(input, CompressionMode.Decompress))
+            using (var output = new MemoryStream())
+            {
+                gzip.CopyTo(output);
+                return output.ToArray();
+            }
+        }
+
+        private bool IsCompressed(byte[] data)
+        {
+            // GZip signature: 0x1F 0x8B
+            return data != null && data.Length >= 2 && data[0] == 0x1F && data[1] == 0x8B;
+        }
     }
 }