- add: Service think

Nebula.Launcher/Services/FileService.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.IO.Compression;
+using System.Runtime.InteropServices;
+using Nebula.Launcher.FileApis;
+using Nebula.Launcher.FileApis.Interfaces;
+using Nebula.Launcher.Utils;
+using Robust.LoaderApi;
+
+namespace Nebula.Launcher.Services;
+
+public class FileService
+{
+    public static string RootPath = Path.Join(Environment.GetFolderPath(
+        Environment.SpecialFolder.ApplicationData), "./Datum/");
+
+    private readonly DebugService _debugService;
+    public readonly IReadWriteFileApi ContentFileApi;
+
+    public readonly IReadWriteFileApi EngineFileApi;
+    public readonly IReadWriteFileApi ManifestFileApi;
+    private HashApi? _hashApi;
+
+    public FileService(DebugService debugService)
+    {
+        _debugService = debugService;
+        ContentFileApi = CreateFileApi("content/");
+        EngineFileApi = CreateFileApi("engine/");
+        ManifestFileApi = CreateFileApi("manifest/");
+    }
+
+    public List<RobustManifestItem> ManifestItems
+    {
+        set => _hashApi = new HashApi(value, ContentFileApi);
+    }
+
+    public HashApi HashApi
+    {
+        get
+        {
+            if (_hashApi is null) throw new Exception("Hash API is not initialized!");
+            return _hashApi;
+        }
+        set => _hashApi = value;
+    }
+
+    public IReadWriteFileApi CreateFileApi(string path)
+    {
+        return new FileApi(Path.Join(RootPath, path));
+    }
+
+    public ZipFileApi OpenZip(string path, IFileApi fileApi)
+    {
+        if (!fileApi.TryOpen(path, out var zipStream))
+            return null;
+
+        var zipArchive = new ZipArchive(zipStream, ZipArchiveMode.Read);
+
+        var prefix = "";
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX)) prefix = "Space Station 14.app/Contents/Resources/";
+        return new ZipFileApi(zipArchive, prefix);
+    }
+}