From a04b6aae9ba62a8b5a3a33aa15ba10e4b196654c Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Wed, 17 Jan 2018 01:26:23 +0400
Subject: [PATCH] implemented Lilim IMG images.

---
 ArcFormats/Lilim/ImageIMG.cs | 96 ++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 ArcFormats/Lilim/ImageIMG.cs

diff --git a/ArcFormats/Lilim/ImageIMG.cs b/ArcFormats/Lilim/ImageIMG.cs
new file mode 100644
index 00000000..975eaf35
--- /dev/null
+++ b/ArcFormats/Lilim/ImageIMG.cs
@@ -0,0 +1,96 @@
+//! \file       ImageIMG.cs
+//! \date       2018 Jan 16
+//! \brief      Lilim obfuscated bitmap.
+//
+// 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.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.Lilim
+{
+    public abstract class BaseImgFormat : ImageFormat
+    {
+        internal IBinaryStream DeobfuscateStream (IBinaryStream file)
+        {
+            var header = file.ReadHeader (0x20).ToArray();
+            for (int i = 0; i < 0x20; ++i)
+                header[i] ^= 0xFF;
+            Stream stream = new StreamRegion (file.AsStream, 0x20, true);
+            stream = new PrefixStream (header, stream);
+            return new BinaryStream (stream, file.Name);
+        }
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class ImgBmpFormat : BaseImgFormat
+    {
+        public override string         Tag { get { return "IMG/BMP"; } }
+        public override string Description { get { return "Lilim obfuscated bitmap"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (2);
+            if ((header[0]^0xFF) != 'B' || (header[1]^0xFF) != 'M')
+                return null;
+            using (var bmp = DeobfuscateStream (file))
+                return Bmp.ReadMetaData (bmp);
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            using (var bmp = DeobfuscateStream (file))
+                return Bmp.Read (bmp, info);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("ImgFormat.Write not implemented");
+        }
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class ImgPngFormat : BaseImgFormat
+    {
+        public override string         Tag { get { return "IMG/PNG"; } }
+        public override string Description { get { return "Lilim obfuscated image"; } }
+        public override uint     Signature { get { return 0xB8B1AF76; } }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            using (var png = DeobfuscateStream (file))
+                return Png.ReadMetaData (png);
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            using (var png = DeobfuscateStream (file))
+                return Png.Read (png, info);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("ImgFormat.Write not implemented");
+        }
+    }
+}