diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index d33b9bc9..b9fafad6 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -228,6 +228,7 @@
+
diff --git a/ArcFormats/Kaguya/ArcAF.cs b/ArcFormats/Kaguya/ArcAF.cs
new file mode 100644
index 00000000..780304dd
--- /dev/null
+++ b/ArcFormats/Kaguya/ArcAF.cs
@@ -0,0 +1,133 @@
+//! \file ArcAF.cs
+//! \date Sun Apr 02 09:01:51 2017
+//! \brief Atelier Kaguya resource archive.
+//
+// Copyright (C) 2017 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.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.Kaguya
+{
+ [Export(typeof(ArchiveFormat))]
+ public class AfOpener : ArchiveFormat
+ {
+ public override string Tag { get { return "ARC/AF01"; } }
+ public override string Description { get { return "Atelier Kaguya resource archive"; } }
+ public override uint Signature { get { return 0x31304641; } } // 'AF01'
+ public override bool IsHierarchic { get { return true; } }
+ public override bool CanWrite { get { return false; } }
+
+ const int MaxFileNameLength = 0x100;
+
+ public override ArcFile TryOpen (ArcView file)
+ {
+ uint index_offset = file.View.ReadUInt32 (8);
+ if (index_offset >= file.MaxOffset - 8)
+ return null;
+ using (var index = file.CreateStream (index_offset + 8))
+ {
+ long data_offset = 12;
+ var name_buffer = new byte[MaxFileNameLength];
+ var dir = new List();
+ while (index.PeekByte() != -1)
+ {
+ int name_length = index.ReadInt32();
+ if (name_length <= 0 || name_length > name_buffer.Length)
+ return null;
+ if (name_length != index.Read (name_buffer, 0, name_length))
+ return null;
+ var name = DecryptString (name_buffer, name_length);
+ name = name.TrimStart ('\\', '/');
+ var entry = FormatCatalog.Instance.Create (name);
+ int flags = index.ReadInt16();
+ entry.IsPacked = 1 == flags;
+ data_offset += 4 + name_length + 6;
+ if (entry.IsPacked)
+ data_offset += 4;
+ entry.Offset = data_offset;
+ entry.Size = index.ReadUInt32();
+ entry.UnpackedSize = index.ReadUInt32();
+ if (!entry.IsPacked)
+ entry.Size = entry.UnpackedSize;
+ if (!entry.CheckPlacement (file.MaxOffset))
+ return null;
+ dir.Add (entry);
+ data_offset += entry.Size;
+ }
+ return new ArcFile (file, this, dir);
+ }
+ }
+
+ public override Stream OpenEntry (ArcFile arc, Entry entry)
+ {
+ var pent = entry as PackedEntry;
+ if (null == pent || !pent.IsPacked)
+ return arc.File.CreateStream (entry.Offset, entry.Size);
+ using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
+ {
+ var output = new byte[pent.UnpackedSize];
+ LzUnpack (input, output);
+ return new BinMemoryStream (output);
+ }
+ }
+
+ string DecryptString (byte[] name, int length)
+ {
+ for (int i = 0; i < length; ++i)
+ name[i] ^= 0xFF;
+ return Encodings.cp932.GetString (name, 0, length);
+ }
+
+ void LzUnpack (Stream input, byte[] output)
+ {
+ var frame = new byte[0x1000];
+ int frame_pos = 1;
+ int dst = 0;
+ using (var bits = new MsbBitStream (input))
+ {
+ while (dst < output.Length)
+ {
+ if (0 != bits.GetNextBit ())
+ {
+ byte b = (byte)bits.GetBits (8);
+ output[dst++] = b;
+ frame[frame_pos++ & 0xFFF] = b;
+ }
+ else
+ {
+ int offset = bits.GetBits (12);
+ int count = bits.GetBits (4) + 2;
+ for (int i = 0; i < count; ++i)
+ {
+ byte b = frame[(offset + i) & 0xFFF];
+ output[dst++] = b;
+ frame[frame_pos++ & 0xFFF] = b;
+ }
+ }
+ }
+ }
+ }
+ }
+}