Extract zip via temp file using UnityWebRequest

Download the .zip to a temporary file and extract from disk instead of loading the entire archive into memory. Uses DownloadHandlerFile to write to Application.temporaryCachePath and replaces the in-memory ExtractZipFile path with a new ExtractZipFileFromFile method that streams entries from the zip file, updates extraction progress, creates directories, and ensures proper cleanup of the ZipFile stream. This reduces memory usage when handling large zip assets.

Assets/Scripts/MDPro3/Boot.cs

@@ -116,8 +116,11 @@ namespace MDPro3
             nowNum = 0;
             totalNum = 0;
 
+            string tempZipPath = Path.Combine(Application.temporaryCachePath, type + "_temp.zip");
+
             string filePath = Path.Combine(Application.streamingAssetsPath, type + ".zip");
             using UnityWebRequest request = UnityWebRequest.Get(filePath);
+            request.downloadHandler = new DownloadHandlerFile(tempZipPath);
             request.SendWebRequest();
             while (!request.isDone)
             {
@@ -128,8 +131,6 @@ namespace MDPro3
 
             if (request.result == UnityWebRequest.Result.Success)
             {
-                byte[] bytes = request.downloadHandler.data;
-
                 title = InterString.Get("正在解压[?]", type + ".zip");
                 string outPath = "";
                 if (type.Contains("_"))
@@ -137,7 +138,7 @@ namespace MDPro3
                 if (outPath.Length > 0 && !Directory.Exists(outPath))
                     Directory.CreateDirectory(outPath);
 
-                IEnumerator extractEnumerator = ExtractZipFile(bytes, outPath);
+                IEnumerator extractEnumerator = ExtractZipFileFromFile(tempZipPath, outPath);
                 while (extractEnumerator.MoveNext())
                     yield return extractEnumerator.Current;
             }
@@ -331,5 +332,52 @@ namespace MDPro3
             string textInt = version.Substring(0, 1) + version.Substring(2, 1) + version.Substring(4, 1);
             return int.Parse(textInt);
         }
+
+        private IEnumerator ExtractZipFileFromFile(string zipPath, string outFolder)
+        {
+            ZipFile zf = null;
+            try
+            {
+                zf = new ZipFile(zipPath);
+                int count = 0;
+                foreach (ZipEntry zipEntry in zf)
+                    count++;
+                totalNum = count;
+                nowNum = 0;
+                extracting = true;
+
+                foreach (ZipEntry zipEntry in zf)
+                {
+                    nowNum++;
+                    if (!zipEntry.IsFile)
+                        continue;
+
+                    string entryFileName = zipEntry.Name;
+                    byte[] buffer = new byte[4096];
+                    Stream zipStream = zf.GetInputStream(zipEntry);
+                    string fullZipToPath = Path.Combine(outFolder, entryFileName);
+                    string directoryName = Path.GetDirectoryName(fullZipToPath);
+                    if (directoryName.Length > 0)
+                        Directory.CreateDirectory(directoryName);
+
+                    using (FileStream streamWriter = File.Create(fullZipToPath))
+                    {
+                        StreamUtils.Copy(zipStream, streamWriter, buffer);
+                    }
+
+                    yield return null;
+                }
+            }
+            finally
+            {
+                if (zf != null)
+                {
+                    zf.IsStreamOwner = true;
+                    zf.Close();
+                }
+                extracting = false;
+            }
+        }
+
     }
 }