From 3c54de367251b217089acf24323db1481c0e61d5 Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Tue, 28 Mar 2017 10:09:07 +0400
Subject: [PATCH] implemented GRA images.

---
 ArcFormats/ArcFormats.csproj  |  1 +
 ArcFormats/Kurumi/ImageGRA.cs | 69 +++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 ArcFormats/Kurumi/ImageGRA.cs

diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 470ef4c1..cfeb8b27 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -105,6 +105,7 @@
     <Compile Include="GameSystem\AudioADP4.cs" />
     <Compile Include="Kaas\ArcPB.cs" />
     <Compile Include="Kaas\AudioKAAS.cs" />
+    <Compile Include="Kurumi\ImageGRA.cs" />
     <Compile Include="Leaf\ArcPX.cs" />
     <Compile Include="Malie\ArcLIBU.cs" />
     <Compile Include="Qlie\DelphiDeserializer.cs" />
diff --git a/ArcFormats/Kurumi/ImageGRA.cs b/ArcFormats/Kurumi/ImageGRA.cs
new file mode 100644
index 00000000..9005bcfc
--- /dev/null
+++ b/ArcFormats/Kurumi/ImageGRA.cs
@@ -0,0 +1,69 @@
+//! \file       ImageGRA.cs
+//! \date       Tue Mar 28 06:35:39 2017
+//! \brief      Virgin Snow image format.
+//
+// Copyright (C) 2017 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 GameRes.Compression;
+
+namespace GameRes.Formats.Kurumi
+{
+    [Export(typeof(ImageFormat))]
+    public class GraFormat : ImageFormat
+    {
+        public override string         Tag { get { return "GRA/VS"; } }
+        public override string Description { get { return "Virgin Snow image format"; } }
+        public override uint     Signature { get { return 0x67726956; } } // 'Virg'
+
+        static readonly byte[] Key = { 0x5A, 0xA5 };
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (0x20);
+            if (!header.AsciiEqual ("Virgin Snow Compressed Data 1.0"))
+                return null;
+            using (var bmp = UnpackStream (file))
+                return Bmp.ReadMetaData (bmp);
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            file.Position = 0x20;
+            using (var bmp = UnpackStream (file))
+                return Bmp.Read (bmp, info);
+        }
+
+        IBinaryStream UnpackStream (IBinaryStream file)
+        {
+            Stream input = new ByteStringEncryptedStream (file.AsStream, Key, true);
+            input = new ZLibStream (input, CompressionMode.Decompress);
+            return new BinaryStream (input, file.Name);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("GraFormat.Write not implemented");
+        }
+    }
+}