add NavMeshFileExtractor

Assets/Scripts/Editor/NavMeshFileExtractor.cs

@@ -0,0 +1,70 @@
+using UnityEditor;
+using UnityEngine;
+using System.IO;
+using System.IO.Compression;
+using System.Collections.Generic;
+
+namespace SanAndreasUnity.Editor
+{
+    [InitializeOnLoad]
+    public class NavMeshFileExtractor
+    {
+        private const string NavMeshesFolderPath = "NavMeshes/";
+        private const string NavMeshesArchiveFileName = "NavMeshes.zip";
+
+
+        static NavMeshFileExtractor()
+        {
+            string fullFolderPath = Path.Combine(Application.dataPath, NavMeshesFolderPath);
+
+            if (!Directory.Exists(fullFolderPath))
+            {
+                Debug.LogError("Failed to extract nav mesh files: folder with nav meshes not found");
+                return;
+            }
+
+            string zipFilePath = Path.Combine(fullFolderPath, NavMeshesArchiveFileName);
+            if (!File.Exists(zipFilePath))
+                return;
+
+            Debug.Log("Attempting to extract nav mesh files");
+
+            var extractedFileNames = new List<string>();
+            long totalFileSizeExtracted = 0;
+
+            using var zipArchive = new ZipArchive(File.OpenRead(zipFilePath), ZipArchiveMode.Read);
+            foreach (var entry in zipArchive.Entries)
+            {
+                if (string.IsNullOrWhiteSpace(entry.Name))
+                    continue;
+
+                using var writeStream = File.OpenWrite(Path.Combine(fullFolderPath, entry.Name));
+                using var entryStream = entry.Open();
+                entryStream.CopyTo(writeStream, 4 * 1024 * 1024);
+                writeStream.Flush(true);
+
+                writeStream.Dispose();
+                entryStream.Dispose();
+
+                extractedFileNames.Add(entry.Name);
+                totalFileSizeExtracted += entry.Length;
+            }
+
+            // close archive so it can be deleted
+            zipArchive.Dispose();
+
+            // delete zip file to reduce size of project, and to prevent it from being extracted again
+            File.Delete(zipFilePath);
+
+            // also delete it's meta file
+            string metaFilePath = zipFilePath + ".meta";
+            if (File.Exists(metaFilePath))
+                File.Delete(metaFilePath);
+
+            AssetDatabase.Refresh();
+
+            Debug.Log($"Successfully extracted nav mesh files, total extracted files' size {totalFileSizeExtracted}, " +
+                $"files extracted:\n{string.Join("\n", extractedFileNames)}");
+        }
+    }
+}

Assets/Scripts/Editor/NavMeshFileExtractor.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 59048888468f66c498c775ac30e1c895
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: