feat: add support for EVB package

ArcFormats/Enigma/ArcEVB.cs

@@ -0,0 +1,104 @@
+//! \file       ArcEVB.cs
+//! \date       2025-12-27
+//! \brief      Enigma Virtual Box resource archive.
+//
+// Copyright (C) 2026 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;
+using System.Linq;
+using System.Text;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Enigma {
+    public enum NodeTypes {
+        File = 2,
+        Folder = 3,
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class EvbPackOpener : ArchiveFormat {
+        public override string         Tag { get { return "EVB"; } }
+        public override string Description { get { return "Enigma Virtual Box resource archive"; } }
+        public override uint     Signature { get { return 0x425645; } } // 'EVB'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen(ArcView file) {
+            uint index_size = file.View.ReadUInt32(0x40) + 68;
+            uint index_offset = 0x4F;
+            uint file_offset = index_size;
+
+            var dir = new List<Entry>();
+            var name_buffer = new StringBuilder();
+            var counts = new List<uint> { file.View.ReadUInt32(0x4C) };
+            var names = new List<string> { "" };
+
+            while (index_offset < index_size - 4) {
+                uint item_count = file.View.ReadUInt32(index_offset + 12);
+                index_offset += 16;
+                name_buffer.Clear();
+                while (true) {
+                    char c = (char)file.View.ReadUInt16(index_offset);
+                    index_offset += 2;
+                    if (c == 0)
+                        break;
+                    name_buffer.Append(c);
+                }
+                if (name_buffer.Length == 0)
+                    return null;
+                var name = name_buffer.ToString();
+                var type = (NodeTypes)file.View.ReadByte(index_offset);
+                index_offset++;
+                counts[counts.Count - 1]--;
+                if (type == NodeTypes.File) {
+                    var entry = Create<Entry>(Path.Combine(names.Append(name).ToArray()));
+                    uint unpacked_size = file.View.ReadUInt32(index_offset + 2);
+                    uint size = file.View.ReadUInt32(index_offset + 49);
+                    if (unpacked_size != size)
+                        return null; // packed entry not implemented
+                    entry.Offset = file_offset;
+                    entry.Size = size;
+                    file_offset += size;
+                    if (!entry.CheckPlacement(file.MaxOffset))
+                        return null;
+                    dir.Add(entry);
+                    while (counts.Count > 0 && counts[counts.Count - 1] == 0) {
+                        counts.RemoveAt(counts.Count - 1);
+                        names.RemoveAt(names.Count - 1);
+                    }
+                    index_offset += 53;
+                }
+                else if (type == NodeTypes.Folder) {
+                    counts.Add(item_count);
+                    names.Add(name);
+                    index_offset += 25;
+                }
+                else
+                    return null;
+            }
+
+            return new ArcFile(file, this, dir);
+        }
+    }
+}