implemented KPC archives and KGP images.

ArcFormats/KScript/ImageKGP.cs

@@ -0,0 +1,95 @@
+//! \file       ImageKGP.cs
+//! \date       Wed Aug 31 11:49:03 2016
+//! \brief      KScript engine RGB image format.
+//
+// Copyright (C) 2016 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;
+using System.Security.Cryptography;
+using System.Windows.Media;
+using GameRes.Utility;
+
+namespace GameRes.Formats.KScript
+{
+    internal class KgpMetaData : ImageMetaData
+    {
+        public byte Key;
+        public int  DataOffset;
+        public int  DataLength;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class KgpFormat : ImageFormat
+    {
+        public override string         Tag { get { return "KGP"; } }
+        public override string Description { get { return "KScript image format"; } }
+        public override uint     Signature { get { return 0x48505247; } } // 'GRPH'
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            var header = new byte[0x1C];
+            if (header.Length != stream.Read (header, 0, header.Length))
+                return null;
+            byte key = (byte)(header[4] ^ header[5]);
+            int data_offset = 0x14;
+            int x = 0, y = 0;
+            if (0 != header[0xC])
+            {
+                data_offset += LittleEndian.ToInt32 (header, 0x10) / 0x10 * 0x18;
+                x = LittleEndian.ToInt32 (header, 0x14);
+                y = LittleEndian.ToInt32 (header, 0x18);
+            }
+            using (var input = new StreamRegion (stream, data_offset, true))
+            using (var png = new CryptoStream (input, new XorTransform (key), CryptoStreamMode.Read))
+            {
+                var info = Png.ReadMetaData (png);
+                if (null == info)
+                    return null;
+                return new KgpMetaData
+                {
+                    Width   = info.Width,
+                    Height  = info.Height,
+                    OffsetX = x,
+                    OffsetY = y,
+                    BPP     = info.BPP,
+                    Key     = key,
+                    DataOffset = data_offset,
+                    DataLength = LittleEndian.ToInt32 (header, 8),
+                };
+            }
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            var meta = (KgpMetaData)info;
+            using (var input = new StreamRegion (stream, meta.DataOffset, true))
+            using (var png = new CryptoStream (input, new XorTransform (meta.Key), CryptoStreamMode.Read))
+                return Png.Read (png, info);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("KgpFormat.Write not implemented");
+        }
+    }
+}