diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 8e8b3622..e622db77 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -153,6 +153,7 @@
+
diff --git a/ArcFormats/ShiinaRio/ArcWARC1.0.cs b/ArcFormats/ShiinaRio/ArcWARC1.0.cs
new file mode 100644
index 00000000..cedde981
--- /dev/null
+++ b/ArcFormats/ShiinaRio/ArcWARC1.0.cs
@@ -0,0 +1,178 @@
+//! \file ArcWARC1.0.cs
+//! \date 2017 Dec 09
+//! \brief Forest archive format.
+//
+// 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Forest
+{
+ ///
+ /// ShiinaRio WARC archives predecessor.
+ ///
+ [Export(typeof(ArchiveFormat))]
+ public class War0Opener : ArchiveFormat
+ {
+ public override string Tag { get { return "WAR/1.0"; } }
+ public override string Description { get { return "Forest resource archive"; } }
+ public override uint Signature { get { return 0x43524157; } } // 'WARC'
+ public override bool IsHierarchic { get { return false; } }
+ public override bool CanWrite { get { return false; } }
+
+ public override ArcFile TryOpen (ArcView file)
+ {
+ if (!file.View.AsciiEqual (4, " 1.0"))
+ return null;
+ uint index_offset = file.View.ReadUInt32 (8);
+ if (index_offset >= file.MaxOffset)
+ return null;
+ var index = file.View.ReadBytes (index_offset, 0xC000);
+ int count = index.Length / 0x18;
+ if (!IsSaneCount (count))
+ return null;
+ for (int i = 0; i < index.Length; i += 2)
+ {
+ index[i ] ^= 0xFE;
+ index[i+1] ^= 0xE5;
+ }
+ int pos = 0;
+ var dir = new List (count);
+ for (int i = 0; i < count; ++i)
+ {
+ var name = Binary.GetCString (index, pos, 0x10);
+ var entry = FormatCatalog.Instance.Create (name);
+ entry.Offset = index.ToUInt32 (pos+0x10);
+ entry.Size = index.ToUInt32 (pos+0x14);
+ if (!entry.CheckPlacement (file.MaxOffset))
+ return null;
+ entry.UnpackedSize = entry.Size;
+ dir.Add (entry);
+ pos += 0x18;
+ }
+ return new ArcFile (file, this, dir);
+ }
+
+ public override Stream OpenEntry (ArcFile arc, Entry entry)
+ {
+ var pent = entry as PackedEntry;
+ if (null == pent)
+ return base.OpenEntry (arc, entry);
+ if (!pent.IsPacked)
+ {
+ if (!arc.File.View.AsciiEqual (entry.Offset, "Ylz"))
+ return base.OpenEntry (arc, entry);
+ pent.IsPacked = true;
+ pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset+4);
+ }
+ var data = arc.File.View.ReadBytes (entry.Offset+8, entry.Size-8);
+ var reader = new Ylz16Reader (data);
+ data = reader.Unpack ((int)pent.UnpackedSize);
+ return new BinMemoryStream (data, entry.Name);
+ }
+ }
+
+ internal sealed class Ylz16Reader
+ {
+ byte[] m_input;
+
+ public Ylz16Reader (byte[] input)
+ {
+ m_input = input;
+ DecryptInput();
+ }
+
+ void DecryptInput ()
+ {
+ for (int i = 0; i < m_input.Length; ++i)
+ m_input[i] ^= 0xE6;
+ }
+
+ int GetCtlBit ()
+ {
+ int bit = m_ctl & 1;
+ m_ctl >>= 1;
+ if (--m_bit_count <= 0)
+ {
+ m_ctl = LittleEndian.ToUInt16 (m_input, m_src);
+ m_src += 2;
+ m_bit_count = 16;
+ }
+ return bit;
+ }
+
+ int m_ctl;
+ int m_bit_count;
+ int m_src;
+
+ public byte[] Unpack (int unpacked_size)
+ {
+ m_src = 0;
+ m_bit_count = 0;
+ GetCtlBit();
+ var output = new byte[unpacked_size];
+ int dst = 0;
+ while (dst < unpacked_size)
+ {
+ if (GetCtlBit() != 0)
+ {
+ output[dst++] = m_input[m_src++];
+ }
+ else
+ {
+ int offset, count;
+ if (GetCtlBit() == 0)
+ {
+ count = GetCtlBit() << 1;
+ count |= GetCtlBit();
+ count += 2;
+ offset = m_input[m_src++] | -0x100;
+ }
+ else
+ {
+ byte lo = m_input[m_src++];
+ byte hi = m_input[m_src++];
+ offset = lo | (hi & ~7) << 5 | -0x2000;
+ count = hi & 7;
+ if (0 == count)
+ {
+ count = m_input[m_src++];
+ if (0 == count)
+ break;
+ count += 9;
+ }
+ else
+ {
+ count += 2;
+ }
+ }
+ Binary.CopyOverlapped (output, dst + offset, dst, count);
+ dst += count;
+ }
+ }
+ return output;
+ }
+ }
+}