implemented multi-frame 'fSGX' images as frame archives.

ArcFormats/Ivory/ArcSG.cs

@@ -0,0 +1,68 @@
+//! \file       ArcSG.cs
+//! \date       2018 Feb 01
+//! \brief      'fSGX' multi-frame image container.
+//
+// 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.Ivory
+{
+    [Export(typeof(ArchiveFormat))]
+    public class SgOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "SG/cOBJ"; } }
+        public override string Description { get { return "Ivory multi-frame image"; } }
+        public override uint     Signature { get { return 0x58475366; } } // 'fSGX'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            long offset = 8;
+            var base_name = Path.GetFileNameWithoutExtension (file.Name);
+            var dir = new List<Entry>();
+            while (offset < file.MaxOffset && file.View.AsciiEqual (offset, "cOBJ"))
+            {
+                uint obj_size = file.View.ReadUInt32 (offset+4);
+                if (0 == obj_size)
+                    break;
+                if (file.View.AsciiEqual (offset+0x10, "fSG "))
+                {
+                    var entry = new Entry {
+                        Name = string.Format ("{0}#{1}", base_name, dir.Count),
+                        Type = "image",
+                        Offset = offset+0x10,
+                        Size = file.View.ReadUInt32 (offset+0x14),
+                    };
+                    dir.Add (entry);
+                }
+                offset += obj_size;
+            }
+            if (0 == dir.Count)
+                return null;
+            return new ArcFile (file, this, dir);
+        }
+    }
+}