Added support for files larger than 2GB

Perfare#869

Author: Heyter

Il2CppDumper/IO/BinaryStream.cs

@@ -22,7 +22,9 @@ public BinaryStream(Stream input)
     {
         stream = input;
         Reader = new BinaryReader(stream, Encoding.UTF8, true);
-        Writer = new BinaryWriter(stream, Encoding.UTF8, true);
+        if (stream.CanWrite) {
+            writer = new BinaryWriter(stream, Encoding.UTF8, true);
+        }
         readClass = GetType().GetMethod("ReadClass", Type.EmptyTypes);
         readClassArray = GetType().GetMethod("ReadClassArray", new[] { typeof(long) });
         genericMethodCache = new Dictionary<Type, MethodInfo>();

Il2CppDumper/Outputs/Il2CppDecompiler.cs

@@ -24,7 +24,7 @@ public Il2CppDecompiler(Il2CppExecutor il2CppExecutor)
 
     public void Decompile(Config config, string outputDir)
     {
-        var writer = new StreamWriter(new FileStream(outputDir + "dump.cs", FileMode.Create), new UTF8Encoding(false));
+        var writer = new StreamWriter(new FileStream(Path.Combine(outputDir, "dump.cs"), FileMode.Create), new UTF8Encoding(false));
         //dump image
         for (var imageIndex = 0; imageIndex < metadata.imageDefs.Length; imageIndex++)
         {

Il2CppDumper/Outputs/StructGenerator.cs

@@ -445,12 +445,9 @@ public void WriteScript(string outputDir, bool escapeJsonValues)
         {
             jsonOptions.Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping;
         }
-        File.WriteAllText(
-            outputDir + "stringliteral.json",
-            JsonSerializer.Serialize(stringLiterals, jsonOptions),
-            new UTF8Encoding(false));
+        File.WriteAllText(Path.Combine(outputDir, "stringliteral.json"), JsonSerializer.Serialize(stringLiterals, jsonOptions), new UTF8Encoding(false));
         //写入文件
-        using (var stream = new FileStream(outputDir + "script.json",FileMode.Create))
+        using (var stream = new FileStream(Path.Combine(outputDir, "script.json"), FileMode.Create))
         {
             JsonSerializer.Serialize(stream, json, jsonOptions);
         }
@@ -517,7 +514,7 @@ public void WriteScript(string outputDir, bool escapeJsonValues)
         sb.Append(arrayClassHeader);
         sb.Append(methodInfoHeader);
         int bufferSize = 4096;
-        using (StreamWriter writer = new StreamWriter(outputDir + "il2cpp.h", false, Encoding.UTF8, bufferSize))
+        using (StreamWriter writer = new StreamWriter(Path.Combine(outputDir, "il2cpp.h"), false, Encoding.UTF8, bufferSize))
         {
             int index = 0;
             int length = sb.Length;

Il2CppDumper/Program.cs

@@ -13,8 +13,7 @@ internal class Program
     [STAThread]
     private static void Main(string[] args)
     {
-        config = JsonSerializer.Deserialize<Config>(
-            File.ReadAllText(AppDomain.CurrentDomain.BaseDirectory + @"config.json"));
+        config = JsonSerializer.Deserialize<Config>(File.ReadAllText(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "config.json")));
         GenerateReplaceNameMap();
         string il2cppPath = null;
         string metadataPath = null;
@@ -29,8 +28,9 @@ private static void Main(string[] args)
             }
         }
 
-        if (args.Length > 3)
+        if (args.Length < 3)
         {
+            Console.WriteLine("ERROR: Not enough arguments.");
             ShowHelp();
             return;
         }
@@ -41,8 +41,12 @@ private static void Main(string[] args)
             {
                 if (File.Exists(arg))
                 {
-                    var file = File.ReadAllBytes(arg);
-                    if (BitConverter.ToUInt32(file, 0) == 0xFAB11BAF)
+                    UInt32 magicBytes = 0;
+                    using (FileStream fileStream = File.OpenRead(arg))
+                    {
+                        magicBytes = new BinaryReader(fileStream).ReadUInt32();
+                    }
+                    if (magicBytes == 0xFAB11BAF)
                     {
                         metadataPath = arg;
                     }
@@ -58,41 +62,29 @@ private static void Main(string[] args)
             }
         }
 
-        outputDir ??= AppDomain.CurrentDomain.BaseDirectory;
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        if (string.IsNullOrEmpty(outputDir) || !Directory.Exists(outputDir))
+        {
+            Console.WriteLine("ERROR: The specified output folder does not exist.");
+            ShowHelp();
+            return;
+        }
+        outputDir = Path.GetFullPath(outputDir) + Path.DirectorySeparatorChar;
         {
-            if (il2cppPath == null)
+            if (il2cppPath == null || metadataPath == null)
             {
-                var ofd = new OpenFileDialog { Filter = "Il2Cpp binary file|*.*" };
-                if (ofd.ShowDialog())
-                {
-                    il2cppPath = ofd.FileName;
-                    ofd.Filter = "global-metadata|global-metadata.dat";
-                    if (ofd.ShowDialog())
-                    {
-                        metadataPath = ofd.FileName;
-                    }
-                    else
-                    {
-                        return;
-                    }
-                }
-                else
-                {
-                    return;
-                }
+                Console.WriteLine("ERROR: Missing required input files.");
+                ShowHelp();
+                return;
             }
         }
-
         if (il2cppPath == null)
         {
             ShowHelp();
             return;
         }
-
         if (metadataPath == null)
         {
-            Console.WriteLine("ERROR: Metadata file not found or encrypted.");
+            Console.WriteLine($"ERROR: Metadata file not found or encrypted.");
         }
         else
         {
@@ -147,8 +139,8 @@ private static void ShowHelp()
     private static bool Init(string il2cppPath, string metadataPath, out Metadata metadata, out Il2Cpp il2Cpp)
     {
         Console.WriteLine("Initializing metadata...");
-        var metadataBytes = File.ReadAllBytes(metadataPath);
-        metadata = new Metadata(new MemoryStream(metadataBytes));
+        var metadataStream = File.OpenRead(metadataPath);
+        metadata = new Metadata(metadataStream);
         Console.WriteLine($"Metadata Version: {metadata.Version}");
 
         Console.WriteLine("Initializing il2cpp file...");