From 98918ff5b56cd07b685950816308902defcdd508 Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Mon, 30 May 2016 15:45:14 +0400
Subject: [PATCH] implemented ancient VOL archives.

---
 ArcFormats/elf/ArcVOL.cs | 86 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 ArcFormats/elf/ArcVOL.cs

diff --git a/ArcFormats/elf/ArcVOL.cs b/ArcFormats/elf/ArcVOL.cs
new file mode 100644
index 00000000..3488347f
--- /dev/null
+++ b/ArcFormats/elf/ArcVOL.cs
@@ -0,0 +1,86 @@
+//! \file       ArcVOL.cs
+//! \date       Sun May 29 02:38:04 2016
+//! \brief      ancient elf resource archives.
+//
+// Copyright (C) 2016 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.Elf
+{
+    [Export(typeof(ArchiveFormat))]
+    public class VolOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "VOL/ELF"; } }
+        public override string Description { get { return "Ancient elf resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public VolOpener ()
+        {
+            Extensions = new string[] { "vol" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.Name.EndsWith (".vol", StringComparison.InvariantCultureIgnoreCase))
+                return null;
+            uint first_offset = file.View.ReadUInt32 (0);
+            if (first_offset < 0x10 || 0 != (first_offset & 0xF) || first_offset >= file.MaxOffset)
+                return null;
+            int count = (int)(first_offset /4);
+            if (!IsSaneCount (count))
+                return null;
+
+            var offset_table = new List<uint> (count);
+            offset_table.Add (first_offset);
+            uint index_offset = 4;
+            for (int i = 1; i < count; ++i)
+            {
+                uint offset = file.View.ReadUInt32 (index_offset);
+                if (offset < offset_table[i-1] || offset > file.MaxOffset)
+                    return null;
+                offset_table.Add (offset);
+                if (offset == file.MaxOffset)
+                    break;
+                index_offset += 4;
+            }
+            var base_name = Path.GetFileNameWithoutExtension (file.Name);
+            var dir = new List<Entry> (offset_table.Count-1);
+            for (int i = 0; i < offset_table.Count-1; ++i)
+            {
+                uint size = offset_table[i+1] - offset_table[i];
+                if (0 == size)
+                    continue;
+                var name = string.Format ("{0}#{1:D4}", base_name, i);
+                var entry = AutoEntry.Create (file, offset_table[i], name);
+                entry.Size = size;
+                dir.Add (entry);
+            }
+            return new ArcFile (file, this, dir);
+        }
+    }
+}