diff --git a/ArcFormats/Origin/ArcGAF.cs b/ArcFormats/Origin/ArcGAF.cs
new file mode 100644
index 00000000..b17ba907
--- /dev/null
+++ b/ArcFormats/Origin/ArcGAF.cs
@@ -0,0 +1,134 @@
+//! \file       ArcGAF.cs
+//! \date       2019 Mar 17
+//! \brief      origin engine bitmap archive.
+//
+// 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.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+
+namespace GameRes.Formats.Origin
+{
+    internal class GafArchive : ArcFile
+    {
+        public readonly ImageMetaData  Info;
+
+        public GafArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, ImageMetaData info)
+            : base (arc, impl, dir)
+        {
+            Info = info;
+        }
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class GafOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "GAF/ORIGIN"; } }
+        public override string Description { get { return "origin engine bitmap archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public GafOpener ()
+        {
+            Extensions = new string[] { "" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!VFS.IsPathEqualsToFileName (file.Name, "gaf"))
+                return null;
+            int count = file.View.ReadInt32 (8);
+            if (!IsSaneCount (count))
+                return null;
+            uint width  = file.View.ReadUInt32 (0);
+            uint height = file.View.ReadUInt32 (4);
+            if (width == 0 || width > 0x4000 || height == 0 || height > 0x4000)
+                return null;
+            uint offset = 0xC;
+            var base_name = Path.GetFileNameWithoutExtension (file.Name);
+            var dir = new List<Entry> (count);
+            uint image_size = width * height;
+            for (int i = 0; i < count; ++i)
+            {
+                var entry = new Entry {
+                    Name = string.Format ("{0}#{1:D4}", base_name, i),
+                    Type = "image",
+                    Offset = offset,
+                };
+                if (i + 1 < count)
+                {
+                    uint unpacked = 0;
+                    while (unpacked < image_size && offset < file.MaxOffset)
+                    {
+                        unpacked += file.View.ReadByte (offset+1);
+                        offset += 2;
+                    }
+                }
+                else
+                {
+                    offset = (uint)file.MaxOffset;
+                }
+                entry.Size = (uint)(offset - entry.Offset);
+                dir.Add (entry);
+            }
+            var info = new ImageMetaData { Width = width, Height = height, BPP = 8 };
+            return new GafArchive (file, this, dir, info);
+        }
+
+        public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
+        {
+            var garc = (GafArchive)arc;
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            return new GafImageDecoder (input, garc.Info);
+        }
+    }
+
+    internal class GafImageDecoder : BinaryImageDecoder
+    {
+        public GafImageDecoder (IBinaryStream input, ImageMetaData info) : base (input, info)
+        {
+        }
+
+        protected override ImageData GetImageData ()
+        {
+            var pixels = new byte[Info.iWidth * Info.iHeight];
+            UnpackRle (pixels);
+            return ImageData.Create (Info, PixelFormats.Gray8, null, pixels, Info.iWidth);
+        }
+
+        void UnpackRle (byte[] output)
+        {
+            int dst = 0;
+            while (dst < output.Length)
+            {
+                byte symbol = m_input.ReadUInt8();
+                int count = Math.Min (m_input.ReadUInt8(), output.Length - dst);
+                while (count --> 0)
+                    output[dst++] = (byte)symbol;
+            }
+        }
+    }
+}