diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index aa374b1d..d940fe34 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -244,6 +244,7 @@
+
@@ -748,6 +749,7 @@
+
diff --git a/ArcFormats/Unity/ArcBIN.cs b/ArcFormats/Unity/ArcBIN.cs
new file mode 100644
index 00000000..acc6bcf9
--- /dev/null
+++ b/ArcFormats/Unity/ArcBIN.cs
@@ -0,0 +1,247 @@
+//! \file ArcBIN.cs
+//! \date 2019 Feb 23
+//! \brief Unity binary data asset.
+//
+// Copyright (C) 2019 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Unity
+{
+ internal class BinArchive : ArcFile
+ {
+ public readonly Aes Encryption;
+
+ public BinArchive (ArcView arc, ArchiveFormat impl, ICollection dir, Aes enc)
+ : base (arc, impl, dir)
+ {
+ Encryption = enc;
+ }
+
+ #region IDisposable Members
+ bool _bin_disposed = false;
+ protected override void Dispose (bool disposing)
+ {
+ if (_bin_disposed)
+ return;
+
+ if (disposing)
+ Encryption.Dispose();
+ _bin_disposed = true;
+ base.Dispose (disposing);
+ }
+ #endregion
+ }
+
+ [Serializable]
+ public class BinPackKey
+ {
+ public byte[] Key;
+ public byte[] IV;
+
+ public BinPackKey (string key, string iv)
+ {
+ Key = Encoding.UTF8.GetBytes (key);
+ IV = Encoding.UTF8.GetBytes (iv);
+ }
+ }
+
+ [Serializable]
+ public class BinPackScheme : ResourceScheme
+ {
+ public Dictionary KnownKeys;
+ }
+
+ [Export(typeof(ArchiveFormat))]
+ public class BinOpener : ArchiveFormat
+ {
+ public override string Tag { get { return "BIN/IDX"; } }
+ public override string Description { get { return "Unity engine resource asset"; } }
+ public override uint Signature { get { return 0; } }
+ public override bool IsHierarchic { get { return true; } }
+ public override bool CanWrite { get { return false; } }
+
+ public override ArcFile TryOpen (ArcView file)
+ {
+ if (!file.Name.HasExtension (".bin"))
+ return null;
+ var idx_name = Path.ChangeExtension (file.Name, "idx");
+ if (!VFS.FileExists (idx_name))
+ return null;
+ var scheme = QueryScheme (file.Name);
+ if (null == scheme)
+ return null;
+ var dir = new List();
+ using (var idx = VFS.OpenBinaryStream (idx_name))
+ using (var aes = Aes.Create())
+ {
+ aes.Padding = PaddingMode.PKCS7;
+ aes.Mode = CipherMode.CBC;
+ aes.KeySize = 128;
+ aes.Key = scheme.Key;
+ aes.IV = scheme.IV;
+ var input_buffer = new byte[0x100];
+ var unpacker = new BinDeserializer();
+ while (idx.PeekByte() != -1)
+ {
+ int length = idx.ReadInt32();
+ if (length <= 0)
+ return null;
+ if (length > input_buffer.Length)
+ input_buffer = new byte[length];
+ if (idx.Read (input_buffer, 0, length) < length)
+ return null;
+ using (var decryptor = aes.CreateDecryptor())
+ using (var encrypted = new MemoryStream (input_buffer, 0, length))
+ using (var input = new InputCryptoStream (encrypted, decryptor))
+ {
+ var info = unpacker.DeserializeEntry (input);
+ var filename = info["fileName"] as string;
+ if (string.IsNullOrEmpty (filename))
+ return null;
+ filename = filename.TrimStart ('/', '\\');
+ var entry = Create (filename);
+ entry.Offset = Convert.ToInt64 (info["index"]);
+ entry.Size = Convert.ToUInt32 (info["size"]);
+ if (!entry.CheckPlacement (file.MaxOffset))
+ return null;
+ dir.Add (entry);
+ }
+ }
+ }
+ if (0 == dir.Count)
+ return null;
+ var arc_aes = Aes.Create();
+ arc_aes.Padding = PaddingMode.PKCS7;
+ arc_aes.Mode = CipherMode.CBC;
+ arc_aes.KeySize = 256;
+ arc_aes.Key = scheme.Key;
+ arc_aes.IV = scheme.IV;
+ return new BinArchive (file, this, dir, arc_aes);
+ }
+
+ public override Stream OpenEntry (ArcFile arc, Entry entry)
+ {
+ var bin_arc = (BinArchive)arc;
+ var decryptor = bin_arc.Encryption.CreateDecryptor();
+ var input = arc.File.CreateStream (entry.Offset, entry.Size);
+ return new InputCryptoStream (input, decryptor);
+ }
+
+ BinPackKey QueryScheme (string arc_name)
+ {
+ return DefaultScheme.KnownKeys.Values.FirstOrDefault();
+ }
+
+ static BinPackScheme DefaultScheme = new BinPackScheme { KnownKeys = new Dictionary() };
+
+ public override ResourceScheme Scheme
+ {
+ get { return DefaultScheme; }
+ set { DefaultScheme = (BinPackScheme)value; }
+ }
+ }
+
+ internal class BinDeserializer
+ {
+ byte[] m_buffer = new byte[0x20];
+
+ public IDictionary DeserializeEntry (Stream input)
+ {
+ int id = input.ReadByte();
+ if (id < 0x80 || id > 0x8F)
+ throw new FormatException();
+ int field_count = id & 0xF;
+ var map = new Hashtable (field_count);
+ for (int i = 0; i < field_count; ++i)
+ {
+ id = input.ReadByte();
+ if (id < 0xA0 || id > 0xBF)
+ throw new FormatException();
+ int length = id & 0x1F;
+ if (input.Read (m_buffer, 0, length) < length)
+ throw new FormatException();
+ var key = Encoding.UTF8.GetString (m_buffer, 0, length);
+ var value = ReadField (input);
+ map[key] = value;
+ }
+ return map;
+ }
+
+ object ReadField (Stream input)
+ {
+ int id = input.ReadByte();
+ if (id >= 0 && id < 0x80)
+ {
+ return id;
+ }
+ else if (id >= 0xA0 && id < 0xC0)
+ {
+ int length = id & 0x1F;
+ return ReadString (input, length);
+ }
+ switch (id)
+ {
+ case 0xD0: // Int8
+ int value = input.ReadByte();
+ if (-1 == value)
+ throw new FormatException();
+ return (sbyte)value;
+
+ case 0xD1: // Int16
+ if (input.Read (m_buffer, 0, 2) < 2)
+ throw new FormatException();
+ return BigEndian.ToInt16 (m_buffer, 0);
+
+ case 0xD2: // Int32
+ if (input.Read (m_buffer, 0, 4) < 4)
+ throw new FormatException();
+ return BigEndian.ToInt32 (m_buffer, 0);
+
+ case 0xDA: // Raw16
+ if (input.Read (m_buffer, 0, 2) < 2)
+ throw new FormatException();
+ int length = BigEndian.ToUInt16 (m_buffer, 0);
+ return ReadString (input, length);
+
+ default:
+ throw new FormatException();
+ }
+ }
+
+ string ReadString (Stream input, int length)
+ {
+ if (length > m_buffer.Length)
+ m_buffer = new byte[(length + 0xF) & ~0xF];
+ input.Read (m_buffer, 0, length);
+ return Encoding.UTF8.GetString (m_buffer, 0, length);
+ }
+ }
+}