(Legacy): another BMP format de-obfuscation.

Legacy/Hyperspace/BmpExtension.cs

@@ -0,0 +1,50 @@
+//! \file       BmpExtension.cs
+//! \date       2018 Jan 14
+//! \brief      BMP files with obfuscated color depth.
+//
+// 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.Windows.Media;
+
+namespace GameRes.Formats.Hyperspace
+{
+    /// <summary>
+    /// Color depth of 24bpp images simply changed to 16bpp. This extensions reverts it back.
+    /// </summary>
+    [Export(typeof(IBmpExtension))]
+    public class BmpDepthFixer : IBmpExtension
+    {
+        public ImageData Read (IBinaryStream file, BmpMetaData info)
+        {
+            if (info.BPP != 0x10 || !file.CanSeek)
+                return null;
+            int stride = ((int)info.Width * 3 + 3) & ~3;
+            int total_24bpp = stride * (int)info.Height;
+            if (total_24bpp + info.ImageOffset != file.Length)
+                return null;
+            file.Position = info.ImageOffset;
+            var pixels = file.ReadBytes ((int)total_24bpp);
+            return ImageData.CreateFlipped (info, PixelFormats.Bgr24, null, pixels, stride);
+        }
+    }
+}