updated formats.

(PICT): fixed 16bpp images.
(GDT): added image format.
(DXR): tweaks to recognizing DXR inside exe files.
(NSA): recognize mp3 files named as nsa.
(TLZ): added ContainedFormats.
(WrapSingleFileAchive): class that represents single file as an archive.
(DesertCgOPener): Software House Parsley archive.
(Triangle.RleReader): utilize UnpackV2, replaced BinaryReader with IBinaryStream.

ArcFormats/SingleFileArchive.cs

@@ -0,0 +1,67 @@
+//! \file       SingleFileArchive.cs
+//! \date       2023 Oct 05
+//! \brief      represent single file as an archive for convenience.
+//
+// Copyright (C) 2023 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;
+
+namespace GameRes.Formats
+{
+    public class WrapSingleFileArchive : ArcFile
+    {
+        internal static readonly ArchiveFormat Format = new SingleFileArchiveFormat();
+
+        public WrapSingleFileArchive (ArcView file, Entry entry)
+            : base (file, Format, new List<Entry> { entry })
+        {
+        }
+
+        public WrapSingleFileArchive (ArcView file, string entry_name)
+            : base (file, Format, new List<Entry> { CreateEntry (file, entry_name) })
+        {
+        }
+
+        private static Entry CreateEntry (ArcView file, string name)
+        {
+            var entry = FormatCatalog.Instance.Create<Entry> (name);
+            entry.Offset = 0;
+            entry.Size = (uint)file.MaxOffset;
+            return entry;
+        }
+
+        /// this format is not registered in catalog and only accessible via WrapSingleFileArchive.Format singleton.
+        private class SingleFileArchiveFormat : ArchiveFormat
+        {
+            public override string         Tag => "DAT/BOGUS";
+            public override string Description => "Not an archive";
+            public override uint     Signature => 0;
+            public override bool  IsHierarchic => false;
+            public override bool      CanWrite => false;
+
+            public override ArcFile TryOpen (ArcView file)
+            {
+                return new WrapSingleFileArchive (file, System.IO.Path.GetFileName (file.Name));
+            }
+        }
+    }
+}