implemented ArchAngel archives (Seraphim engine precursor).

ArcFormats/Seraphim/ArcArchAngel.cs

@@ -0,0 +1,132 @@
+//! \file       ArcArchAngel.cs
+//! \date       2022 May 01
+//! \brief      ArchAngel engine resource archive.
+//
+// Copyright (C) 2022 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;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.ArchAngel
+{
+    [Export(typeof(ArchiveFormat))]
+    public class DatOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "DAT/ARCH"; } }
+        public override string Description { get { return "ArchAngel engine resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public DatOpener ()
+        {
+            ContainedFormats = new[] { "CB" };
+        }
+
+        static readonly string[] DefaultSections = { "image", "script", null };
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (file.MaxOffset > uint.MaxValue
+                || !VFS.IsPathEqualsToFileName (file.Name, "ARCHPAC.DAT"))
+                return null;
+            int file_count = file.View.ReadInt16 (0);
+            if (!IsSaneCount (file_count))
+                return null;
+            uint index_pos = 2;
+            var size_table = new uint[file_count];
+            for (int i = 0; i < file_count; ++i)
+            {
+                size_table[i] = file.View.ReadUInt32 (index_pos);
+                index_pos += 4;
+            }
+            var section_table = new SortedDictionary<int, uint>();
+            uint min_offset = (uint)file.MaxOffset;
+            while (index_pos + 6 <= min_offset)
+            {
+                uint offset = file.View.ReadUInt32 (index_pos);
+                int index = file.View.ReadInt16 (index_pos+4);
+                if (index < 0 || index > file_count || offset > file.MaxOffset)
+                    return null;
+                if (offset < min_offset)
+                    min_offset = offset;
+                section_table[index] = offset;
+                index_pos += 6;
+            }
+            var dir = new List<Entry> (file_count);
+            int section_num = 0;
+            foreach (var section in section_table)
+            {
+                int i = section.Key;
+                uint base_offset = section.Value;
+                do
+                {
+                    uint size = size_table[i];
+                    var entry = new PackedEntry {
+                        Name = string.Format ("{0}-{1:D6}", section_num, i),
+                        Offset = base_offset,
+                        Size = size,
+                    };
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    if (section_num < DefaultSections.Length && DefaultSections[section_num] != null)
+                        entry.Type = DefaultSections[section_num];
+                    if ("script" == entry.Type)
+                        entry.IsPacked = true;
+                    dir.Add (entry);
+                    base_offset += size;
+                    ++i;
+                }
+                while (i < file_count && !section_table.ContainsKey (i));
+                ++section_num;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            if (0 == entry.Size)
+                return Stream.Null;
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked || pent.Size <= 4)
+                return base.OpenEntry (arc, entry);
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            if (0 == pent.UnpackedSize)
+                pent.UnpackedSize = input.Signature;
+            try
+            {
+                var data = Seraphim.ScnOpener.LzDecompress (input);
+                return new BinMemoryStream (data, entry.Name);
+            }
+            catch
+            {
+                return arc.File.CreateStream (entry.Offset, entry.Size);
+            }
+            finally
+            {
+                input.Dispose();
+            }
+        }
+    }
+}