GARbro-mirror/ArcFormats/AnimeGameSystem/ArcDAT.cs

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//! \file ArcDAT.cs
//! \date Thu Nov 05 04:40:35 2015
//! \brief AnimeGameSystem resource archive.
//
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// Copyright (C) 2015-2017 by morkt
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//
// 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;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
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using GameRes.Utility;
namespace GameRes.Formats.Ags
{
[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
public override string Tag { get { return "DAT/AGS"; } }
public override string Description { get { return "AnimeGameSystem resource archive"; } }
public override uint Signature { get { return 0x6B636170; } } // 'pack'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public DatOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt16 (4);
if (!IsSaneCount (count))
return null;
uint index_offset = 6;
uint index_size = (uint)count*0x18;
if (index_size > file.View.Reserve (index_offset, index_size))
return null;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset, 0x10);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = file.View.ReadUInt32 (index_offset+0x10);
entry.Size = file.View.ReadUInt32 (index_offset+0x14);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x18;
}
var arc_name = Path.GetFileName (file.Name);
if (EncryptedArchives.Contains (arc_name))
{
var options = Query<AgsOptions> (arcStrings.AGSMightBeEncrypted);
EncryptionKey key;
if (options.Scheme.FileMap.TryGetValue (arc_name, out key))
return new DatArchive (file, this, dir, key);
}
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return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var earc = arc as DatArchive;
if (null == earc)
return base.OpenEntry (arc, entry);
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
byte key = earc.Key.Initial;
for (int i = 0; i < data.Length; ++i)
{
data[i] ^= key;
key += earc.Key.Increment;
}
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return new BinMemoryStream (data, entry.Name);
}
public static readonly EncryptionScheme DefaultScheme = new EncryptionScheme {
FileMap = new Dictionary<string, EncryptionKey>()
};
public override ResourceOptions GetDefaultOptions ()
{
return new AgsOptions { Scheme = GetScheme (Settings.Default.AGSTitle) };
}
public override object GetAccessWidget ()
{
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return new GUI.WidgetAGS (KnownSchemes.Keys);
}
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public EncryptionScheme GetScheme (string title)
{
EncryptionScheme scheme;
if (string.IsNullOrEmpty (title) || !KnownSchemes.TryGetValue (title, out scheme))
scheme = DefaultScheme;
return scheme;
}
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AgsScheme m_scheme = new AgsScheme
{
KnownSchemes = new Dictionary<string, EncryptionScheme>(),
EncryptedArchives = new HashSet<string>()
};
Dictionary<string, EncryptionScheme> KnownSchemes { get { return m_scheme.KnownSchemes; } }
HashSet<string> EncryptedArchives { get { return m_scheme.EncryptedArchives; } }
public override ResourceScheme Scheme
{
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get { return m_scheme; }
set { m_scheme = (AgsScheme)value; }
}
}
internal class DatArchive : ArcFile
{
public EncryptionKey Key;
public DatArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, EncryptionKey key)
: base (arc, impl, dir)
{
Key = key;
}
}
internal class AgsOptions : ResourceOptions
{
public EncryptionScheme Scheme;
}
[Serializable]
public struct EncryptionKey
{
public byte Initial;
public byte Increment;
}
[Serializable]
public class EncryptionScheme
{
public Dictionary<string, EncryptionKey> FileMap;
}
[Serializable]
public class AgsScheme : ResourceScheme
{
public Dictionary<string, EncryptionScheme> KnownSchemes;
public HashSet<string> EncryptedArchives;
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}
}