diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index c6ffdb07..2f1c6614 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -277,6 +277,7 @@
+
diff --git a/ArcFormats/Speed/ArcARC.cs b/ArcFormats/Speed/ArcARC.cs
new file mode 100644
index 00000000..48f35d61
--- /dev/null
+++ b/ArcFormats/Speed/ArcARC.cs
@@ -0,0 +1,136 @@
+//! \file ArcARC.cs
+//! \date 2018 Oct 09
+//! \brief Speed resource archive.
+//
+// Copyright (C) 2018 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 System.Windows.Media;
+using System.Windows.Media.Imaging;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Speed
+{
+ [Export(typeof(ArchiveFormat))]
+ public class ArcOpener : ArchiveFormat
+ {
+ public override string Tag { get { return "ARC/REC"; } }
+ public override string Description { get { return "REC engine resource archive"; } }
+ public override uint Signature { get { return 0xFF; } }
+ public override bool IsHierarchic { get { return false; } }
+ public override bool CanWrite { get { return false; } }
+
+ public override ArcFile TryOpen (ArcView file)
+ {
+ int count = file.View.ReadInt32 (8);
+ if (!IsSaneCount (count))
+ return null;
+ uint rec_length = file.View.ReadUInt32 (0);
+ if (rec_length < 0x10 || rec_length > 0x200)
+ return null;
+ int rec_count = file.View.ReadInt32 (4);
+ if (rec_count < count || rec_length * rec_count >= file.MaxOffset)
+ return null;
+ long index_offset = 0x10;
+ var dir = new List (count);
+ for (int i = 0; i < count; ++i)
+ {
+ var name = file.View.ReadString (index_offset, rec_length);
+ var entry = Create (name);
+ dir.Add (entry);
+ index_offset += rec_length;
+ }
+ index_offset = 0x10 + rec_length * (rec_count + 2);
+ rec_length = file.View.ReadUInt32 (index_offset);
+ rec_count = file.View.ReadInt32 (index_offset+4);
+ if (rec_length != 4 || count != file.View.ReadInt32 (index_offset+8))
+ return null;
+ index_offset += 0x10;
+ long data_offset = index_offset + rec_length * (rec_count + 2) + 4;
+ foreach (var entry in dir)
+ {
+ entry.Offset = data_offset + file.View.ReadUInt32 (index_offset);
+ if (entry.Type == "image")
+ entry.Offset += 16;
+ else
+ entry.Offset += 4;
+ if (entry.Offset > file.MaxOffset)
+ return null;
+ index_offset += rec_length;
+ }
+ for (int i = 1; i < count; ++i)
+ dir[i-1].Size = (uint)(dir[i].Offset - 4 - dir[i-1].Offset);
+ dir[count-1].Size = (uint)(file.MaxOffset - dir[count-1].Offset);
+ return new ArcFile (file, this, dir);
+ }
+
+ public override Stream OpenEntry (ArcFile arc, Entry entry)
+ {
+ uint size = arc.File.View.ReadUInt32 (entry.Offset-4);
+ return arc.File.CreateStream (entry.Offset, size, entry.Name);
+ }
+
+ public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
+ {
+ int width = arc.File.View.ReadInt32 (entry.Offset-16);
+ int height = arc.File.View.ReadInt32 (entry.Offset-12);
+ uint unpacked_size = arc.File.View.ReadUInt32 (entry.Offset-8);
+ using (var input = OpenEntry (arc, entry))
+ {
+ var pixels = new byte[unpacked_size];
+ LzUnpack (input, pixels);
+ var bitmap = BitmapSource.Create (width, height, ImageData.DefaultDpiX, ImageData.DefaultDpiY,
+ PixelFormats.Bgra32, null, pixels, width * 4);
+ return new BitmapSourceDecoder (bitmap);
+ }
+ }
+
+ void LzUnpack (Stream input, byte[] output)
+ {
+ using (var bits = new MsbBitStream (input, true))
+ {
+ int dst = 0;
+ while (dst < output.Length)
+ {
+ int ctl = bits.GetNextBit();
+ if (-1 == ctl)
+ break;
+ if (0 == ctl)
+ {
+ output[dst++] = (byte)bits.GetBits (8);
+ }
+ else
+ {
+ int offset = bits.GetBits (8);
+ int count = bits.GetBits (8);
+ if (offset <= 0)
+ break;
+ Binary.CopyOverlapped (output, dst - offset, dst, count);
+ dst += count;
+ }
+ }
+ }
+ }
+ }
+}