(NonColor): reworked archive index reading.

ArcFormats/NonColor/ArcMinato.cs

@@ -0,0 +1,102 @@
+//! \file       ArcDAT.cs
+//! \date       2018 Jan 17
+//! \brief      MinatoSoft 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 GameRes.Utility;
+using GameRes.Formats.NonColor;
+
+namespace GameRes.Formats.Minato
+{
+    [Serializable]
+    public class NcSchemeCrc32 : Scheme
+    {
+        public NcSchemeCrc32 (string title) : base (title) { }
+
+        public override ulong ComputeHash (byte[] name)
+        {
+            return Crc32.Compute (name, 0, name.Length);
+        }
+    }
+
+    /// <summary>
+    /// This format is mostly identical to NonColor.DatOpener, but uses CRC32 for hashes and big-endian
+    /// byte order.
+    /// </summary>
+    [Export(typeof(ArchiveFormat))]
+    public class MinatoDatOpener : NonColor.DatOpener
+    {
+        public override string         Tag { get { return "DAT/MINATO"; } }
+        public override string Description { get { return "MinatoSoft resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.Name.HasExtension (".dat"))
+                return null;
+            int count = Binary.BigEndian (file.View.ReadInt32 (0)) ^ SignatureKey;
+            if (!IsSaneCount (count))
+                return null;
+
+            var scheme = QueryScheme (file.Name);
+            if (null == scheme)
+                return null;
+
+            using (var index = new MinatoIndexReader (file, count))
+            {
+                var file_map = ReadFilenameMap (scheme);
+                var dir = index.Read (file_map);
+                if (null == dir)
+                    return null;
+                return new ArcDatArchive (file, this, dir, scheme.Hash);
+            }
+        }
+    }
+
+    internal class MinatoIndexReader : NcIndexReaderBase
+    {
+        public MinatoIndexReader (ArcView file, int count) : base (file, count) { }
+
+        protected override ArcDatEntry ReadEntry ()
+        {
+            uint key            = Binary.BigEndian (m_input.ReadUInt32());
+            int  flags          = m_input.ReadUInt8() ^ (byte)key;
+            uint offset         = Binary.BigEndian (m_input.ReadUInt32()) ^ key;
+            uint packed_size    = Binary.BigEndian (m_input.ReadUInt32()) ^ key;
+            uint unpacked_size  = Binary.BigEndian (m_input.ReadUInt32()) ^ key;
+            return new ArcDatEntry {
+                Hash   = key,
+                Flags  = flags,
+                Offset = offset,
+                Size   = packed_size,
+                UnpackedSize = unpacked_size,
+                IsPacked = 0 != (flags & 2),
+            };
+        }
+    }
+}