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80 lines
3.1 KiB
C#
80 lines
3.1 KiB
C#
//! \file ArcCG.cs
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//! \date 2018 Jan 09
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//! \brief ACTGS engine encrypted archive.
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//
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// Copyright (C) 2018 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Linq;
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namespace GameRes.Formats.Actgs
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{
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[Export(typeof(ArchiveFormat))]
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public class CgOpener : DatOpener
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{
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public override string Tag { get { return "CG/ACTGS"; } }
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public override string Description { get { return "ACTGS engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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var key = FindKey (file);
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if (null == key)
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return null;
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uint signature_key = key.ToUInt32 (0);
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int count = (int)(file.View.ReadUInt32 (0) ^ signature_key);
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if (!IsSaneCount (count))
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return null;
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uint index_size = 32 * (uint)count;
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using (var enc = file.CreateStream (0x10, index_size))
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using (var input = new ByteStringEncryptedStream (enc, key))
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using (var index = new BinaryStream (input, file.Name))
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{
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var reader = new IndexReader (file.MaxOffset);
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var dir = reader.Read (index, count);
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if (null == dir)
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return null;
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return new ActressArchive (file, this, dir, key);
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}
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}
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byte[] FindKey (ArcView file)
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{
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var pattern = file.View.ReadBytes (4, 8);
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return Array.Find (KnownKeys, k => KeySequence (k).Skip (4).Take (8).SequenceEqual (pattern));
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}
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internal static IEnumerable<byte> KeySequence (byte[] key)
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{
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for (;;)
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{
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for (int i = 0; i < key.Length; ++i)
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yield return key[i];
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}
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}
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}
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}
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