New game entries.

AssetStudio/BundleFile.cs

@@ -156,7 +156,7 @@ namespace AssetStudio
             return header;
         }
 
-        private void ReadHeaderAndBlocksInfo(EndianBinaryReader reader)
+        private void ReadHeaderAndBlocksInfo(FileReader reader)
         {
             if (m_Header.version >= 4)
             {
@@ -208,7 +208,7 @@ namespace AssetStudio
             return blocksStream;
         }
 
-        private void ReadBlocksAndDirectory(EndianBinaryReader reader, Stream blocksStream)
+        private void ReadBlocksAndDirectory(FileReader reader, Stream blocksStream)
         {
             var isCompressed = m_Header.signature == "UnityWeb";
             foreach (var blockInfo in m_BlocksInfo)
@@ -278,7 +278,7 @@ namespace AssetStudio
             XORShift128.Init = false;
         }
 
-        private void ReadHeader(EndianBinaryReader reader)
+        private void ReadHeader(FileReader reader)
         {
             if (Game.Type.IsBH3() && XORShift128.Init)
             {
@@ -309,7 +309,7 @@ namespace AssetStudio
             }
         }
 
-        private void ReadBlocksInfoAndDirectory(EndianBinaryReader reader)
+        private void ReadBlocksInfoAndDirectory(FileReader reader)
         {
             if (Game.Type.IsCNUnity())
             {
@@ -430,7 +430,7 @@ namespace AssetStudio
             }
         }
 
-        private void ReadBlocks(EndianBinaryReader reader, Stream blocksStream)
+        private void ReadBlocks(FileReader reader, Stream blocksStream)
         {
             for (int i = 0; i < m_BlocksInfo.Length; i++)
             {
@@ -464,6 +464,10 @@ namespace AssetStudio
                             {
                                 CNUnity.DecryptBlock(compressedBytesSpan, compressedSize, i);
                             }
+                            if (Game.Type.IsOPFP())
+                            {
+                                OPFPUtils.Decrypt(compressedBytesSpan, reader.FullPath);
+                            }
                             var uncompressedSize = (int)blockInfo.uncompressedSize;
                             var uncompressedBytes = BigArrayPool<byte>.Shared.Rent(uncompressedSize);
                             var uncompressedBytesSpan = uncompressedBytes.AsSpan(0, uncompressedSize);

AssetStudio/Crypto/OPFPUtils.cs

@@ -0,0 +1,40 @@
+using System;
+
+namespace AssetStudio
+{
+    public static class OPFPUtils
+    {
+        public static readonly string[] EncrytpedFolders = { "UI/", "Atlas/", "UITexture/", "DynamicAtlas/" };
+
+        public static void Decrypt(Span<byte> data, string path)
+        {
+            if (IsEncryptionBundle(path, out var key))
+            {
+                data[0] ^= key;
+                for (int i = 1; i < data.Length; i++)
+                {
+                    data[i] ^= data[i - 1];
+                }
+            }
+        }
+        private static bool IsEncryptionBundle(string path, out byte key) 
+        {
+            path = path.Replace("\\", "/");
+            foreach(var encryptedFolder in EncrytpedFolders)
+            {
+                var index = path.IndexOf(encryptedFolder, 0, path.Length, StringComparison.OrdinalIgnoreCase);
+                if (index != -1)
+                {
+                    var assetPath = path[index..];
+                    if (assetPath.StartsWith(encryptedFolder, StringComparison.OrdinalIgnoreCase))
+                    {
+                        key = (byte)assetPath.Length;
+                        return true;
+                    }
+                }
+            }
+            key = 0x00;
+            return false;
+        }
+    }
+}

AssetStudio/FileReader.cs

@@ -148,6 +148,12 @@ namespace AssetStudio
                     case GameType.OPFP:
                         reader = ParseOPFP(reader);
                         break;
+                    case GameType.AlchemyStars:
+                        reader = ParseAlchemyStars(reader);
+                        break;
+                    case GameType.FantasyOfWind:
+                        reader = DecryptFantasyOfWind(reader);
+                        break;
                 }
             }
             if (reader.FileType == FileType.BundleFile && game.Type.IsBlockFile())

AssetStudio/GameManager.cs

@@ -27,6 +27,8 @@ namespace AssetStudio
             Games.Add(index++, new Game(GameType.Naraka));
             Games.Add(index++, new Game(GameType.EnsembleStars));
             Games.Add(index++, new Game(GameType.OPFP));
+            Games.Add(index++, new Game(GameType.AlchemyStars));
+            Games.Add(index++, new Game(GameType.FantasyOfWind));
         }
         public static Game GetGame(int index)
         {
@@ -123,7 +125,9 @@ namespace AssetStudio
         Naraka,
         CNUnity,
         EnsembleStars,
-        OPFP
+        OPFP,
+        AlchemyStars,
+        FantasyOfWind
     }
 
     public static class GameTypes

AssetStudio/ImportHelper.cs

@@ -7,6 +7,7 @@ using System.Diagnostics;
 using System.IO;
 using System.IO.Compression;
 using System.Linq;
+using System.Text;
 using static AssetStudio.BundleFile;
 using static AssetStudio.Crypto;
 
@@ -273,16 +274,91 @@ namespace AssetStudio
 
         public static FileReader ParseOPFP(FileReader reader)
         {
-            MemoryStream ms = new();
+            var stream = reader.BaseStream;
-
+            var data = reader.ReadBytes(0x1000);
-            var data = reader.ReadBytes((int)reader.BaseStream.Length);
             var idx = data.Search("UnityFS");
             if (idx != -1)
             {
-                var count = data.Length - idx;
+                stream = new BlockStream(stream, idx);
-                ms = new(data, idx, count);  
             }
 
+            return new FileReader(reader.FullPath, stream);
+        }
+
+        public static FileReader ParseAlchemyStars(FileReader reader)
+        {
+            var stream = reader.BaseStream;
+            var data = reader.ReadBytes(0x1000);
+            var idx = data.Search("UnityFS");
+            if (idx != -1)
+            {
+                var idx2 = data[(idx + 1)..].Search("UnityFS");
+                if (idx2 != -1)
+                {
+                    stream = new BlockStream(stream, idx + idx2 + 1);
+                }
+                else
+                {
+                    stream = new BlockStream(stream, idx);
+                }
+            }
+
+            return new FileReader(reader.FullPath, stream);
+        }
+        
+        public static FileReader DecryptFantasyOfWind(FileReader reader)
+        {
+            byte[] encryptKeyName = Encoding.UTF8.GetBytes("28856");
+            const int MinLength = 0xC8;
+            const int KeyLength = 8;
+            const int EnLength = 0x32;
+            const int StartEnd = 0x14;
+            const int HeadLength = 5;
+
+            var signature = reader.ReadStringToNull(HeadLength);
+            if (string.Compare(signature, "K9999") > 0 || reader.Length <= MinLength)
+            {
+                reader.Position = 0;
+                return reader;
+            }
+
+            reader.Position = reader.Length + ~StartEnd;
+            var keyLength = reader.ReadByte();
+            reader.Position = reader.Length - StartEnd - 2;
+            var enLength = reader.ReadByte();
+
+            var enKeyPos = (byte)((keyLength % KeyLength) + KeyLength);
+            var encryptedLength = (byte)((enLength % EnLength) + EnLength);
+
+            reader.Position = reader.Length - StartEnd - enKeyPos;
+            var encryptKey = reader.ReadBytes(KeyLength);
+
+            var subByte = (byte)(reader.Length - StartEnd - KeyLength - (keyLength % KeyLength));
+            for (var i = 0; i < KeyLength; i++)
+            {
+                if (encryptKey[i] == 0)
+                {
+                    encryptKey[i] = (byte)(subByte + i);
+                }
+            }
+
+            var key = new byte[encryptKeyName.Length + KeyLength];
+            encryptKeyName.CopyTo(key.AsMemory(0));
+            encryptKey.CopyTo(key.AsMemory(encryptKeyName.Length));
+
+            reader.Position = HeadLength;
+            var data = reader.ReadBytes(encryptedLength);
+            for (int i = 0; i < encryptedLength; i++)
+            {
+                data[i] ^= key[i % key.Length]; 
+            }
+
+            MemoryStream ms = new();
+            ms.Write(Encoding.UTF8.GetBytes("Unity"));
+            ms.Write(data);
+            reader.BaseStream.CopyTo(ms);
+            ms.Position = 0;
+
             return new FileReader(reader.FullPath, ms);
         }
     }