From e5ffd784c5cf640b6e901ca81e35274b99424021 Mon Sep 17 00:00:00 2001
From: Crsky <crskycode@hotmail.com>
Date: Mon, 2 Feb 2026 19:30:03 +0800
Subject: [PATCH] feat: Add Edoire's resource archive

---
 ArcFormats/ArcFormats.csproj |  1 +
 ArcFormats/Edoire/ArcARC.cs  | 85 ++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 ArcFormats/Edoire/ArcARC.cs

diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 09a44aec..757307ed 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -156,6 +156,7 @@
     <Compile Include="DxLib\WidgetDXA.xaml.cs">
       <DependentUpon>WidgetDXA.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Edoire\ArcARC.cs" />
     <Compile Include="FC01\ArcBDT.cs" />
     <Compile Include="FC01\ArcSCXA.cs" />
     <Compile Include="FC01\BdtTables.cs" />
diff --git a/ArcFormats/Edoire/ArcARC.cs b/ArcFormats/Edoire/ArcARC.cs
new file mode 100644
index 00000000..f9131806
--- /dev/null
+++ b/ArcFormats/Edoire/ArcARC.cs
@@ -0,0 +1,85 @@
+//! \file       ArcARC.cs
+//! \date       2026 Feb 02
+//! \brief      Edoire's resource archive.
+//
+// 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;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.Text;
+
+namespace GameRes.Formats.Edoire
+{
+    [Export(typeof(ArchiveFormat))]
+    public class ArcOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ARC"; } }
+        public override string Description { get { return "Edoire's resource archive"; } }
+        public override uint     Signature { get { return 0x43524140; } } // "@ARCH000"
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public ArcOpener ()
+        {
+            Extensions = new string[] { "arc" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (0, "@ARCH000"))
+                return null;
+            var index_offset = file.View.ReadInt64 (file.MaxOffset-8);
+            var count = file.View.ReadInt32 (index_offset);
+            if (!IsSaneCount (count))
+                return null;
+            index_offset += 4;
+            var dir = new List<Entry> (count);
+            for (var i = 0; i < count; i++)
+            {
+                var len = file.View.ReadByte (index_offset);
+                index_offset += 1;
+                var name = file.View.ReadString (index_offset, len, Encoding.UTF8);
+                index_offset += len;
+                var offset = file.View.ReadInt64 (index_offset);
+                index_offset += 8;
+                var size = file.View.ReadInt64 (index_offset);
+                index_offset += 9;
+                len = file.View.ReadByte (index_offset);
+                index_offset += 1;
+                var path = file.View.ReadString (index_offset, len, Encoding.UTF8);
+                index_offset += len;
+                if (path.StartsWith ("/"))
+                    path = path.Substring (1);
+                if (!string.IsNullOrEmpty (path) && !path.EndsWith ("/"))
+                    path += "/";
+                var entry = Create<Entry> (path+name);
+                entry.Offset = offset;
+                entry.Size = Convert.ToUInt32 (size);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+            }
+            return new ArcFile (file, this, dir);
+        }
+    }
+}