From 8c55658d656b963635ad7d484b15ff3b84925d6a Mon Sep 17 00:00:00 2001
From: morkt <morkt@users.noreply.github.com>
Date: Sat, 29 Dec 2018 22:31:13 +0400
Subject: [PATCH] (Legacy): implemented TEX images.

---
 Legacy/Legacy.csproj        |  1 +
 Legacy/System21/ImageTEX.cs | 83 +++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 Legacy/System21/ImageTEX.cs

diff --git a/Legacy/Legacy.csproj b/Legacy/Legacy.csproj
index 562d907e..3b19753a 100644
--- a/Legacy/Legacy.csproj
+++ b/Legacy/Legacy.csproj
@@ -139,6 +139,7 @@
     <Compile Include="Rune\ArcYK.cs" />
     <Compile Include="Sarang\ImageABC.cs" />
     <Compile Include="Sogna\ArcSGS.cs" />
+    <Compile Include="System21\ImageTEX.cs" />
     <Compile Include="Tako\ArcMPK.cs" />
     <Compile Include="Tetratech\ArcBND.cs" />
     <Compile Include="Tigerman\ArcCHR.cs" />
diff --git a/Legacy/System21/ImageTEX.cs b/Legacy/System21/ImageTEX.cs
new file mode 100644
index 00000000..40f44dac
--- /dev/null
+++ b/Legacy/System21/ImageTEX.cs
@@ -0,0 +1,83 @@
+//! \file       ImageTEX.cs
+//! \date       2018 Dec 25
+//! \brief      System21 texture format.
+//
+// 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;
+using GameRes.Compression;
+
+namespace GameRes.Formats.System21
+{
+    [Export(typeof(ImageFormat))]
+    public class TexFormat : ImageFormat
+    {
+        public override string         Tag { get { return "TEX/SZDD"; } }
+        public override string Description { get { return "System21 compressed texture format"; } }
+        public override uint     Signature { get { return 0x44445A53; } } // 'SZDD'
+        public override bool      CanWrite { get { return false; } }
+
+        static readonly ResourceInstance<ImageFormat> DdsFormat = new ResourceInstance<ImageFormat> ("DDS");
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            using (var input = OpenLzStream (file))
+            {
+                var header = new byte[0x84];
+                if (input.Read (header, 0, header.Length) != header.Length)
+                    return null;
+                if (!header.AsciiEqual (4, "DDS "))
+                    return null;
+                using (var dds = new BinMemoryStream (header, 4, header.Length - 4))
+                    return DdsFormat.Value.ReadMetaData (dds);
+            }
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            using (var lz = OpenLzStream (file))
+            {
+                var skip = new byte[4];
+                lz.Read (skip, 0, 4);
+                using (var input = new SeekableStream (lz))
+                using (var dds = new BinaryStream (input, file.Name))
+                    return DdsFormat.Value.Read (dds, info);
+            }
+        }
+
+        Stream OpenLzStream (IBinaryStream input)
+        {
+            input.Position = 0xE;
+            var lz = new LzssStream (input.AsStream, LzssMode.Decompress, true);
+            lz.Config.FrameSize = 0x1000;
+            lz.Config.FrameFill = 0x20;
+            lz.Config.FrameInitPos = 0x1000 - 0x10;
+            return lz;
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("TexFormat.Write not implemented");
+        }
+    }
+}