(Legacy): implemented Gaia obfuscated images.

Legacy/Gaia/ImageJPG.cs

@@ -0,0 +1,63 @@
+//! \file       ImageJPG.cs
+//! \date       2018 Jul 15
+//! \brief      Gaia obfuscated JPEG image.
+//
+// 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.Gaia
+{
+    [Export(typeof(ImageFormat))]
+    public class HiddenJpegFormat : ImageFormat
+    {
+        public override string         Tag { get { return "JPG/HIDDEN"; } }
+        public override string Description { get { return "Gaia obfuscated JPEG image"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            if ((file.Signature & 0xFFFFFF) != 0xFDFF00)
+                return null;
+            using (var jpeg = OpenAsJpeg (file))
+                return Jpeg.ReadMetaData (jpeg);
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            using (var jpeg = OpenAsJpeg (file))
+                return Jpeg.Read (jpeg, info);
+        }
+
+        IBinaryStream OpenAsJpeg (IBinaryStream file)
+        {
+            var input = new StreamRegion (file.AsStream, 100, true);
+            return new BinaryStream (input, file.Name);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("HiddenJpegFormat.Write not implemented");
+        }
+    }
+}