GARbro-mirror/ArcFormats/Dac/ArcDPK.cs

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//! \file ArcDPK.cs
//! \date Mon Jun 01 13:29:09 2015
//! \brief DPK archive
//
// Copyright (C) 2015 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.Globalization;
using System.IO;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
using GameRes.Utility;
namespace GameRes.Formats.Dac
{
internal class DpkOptions : ResourceOptions
{
public uint Key1;
public uint Key2;
}
[Serializable]
public class DpkScheme
{
public uint Key1 { get; set; }
public uint Key2 { get; set; }
public string Name { get; set; }
public string OriginalTitle { get; set; }
}
[Serializable]
public class ArchiveScheme : ResourceScheme
{
public DpkScheme[] KnownSchemes;
}
internal class DpkEntry : Entry
{
public uint Hash;
}
internal class DpkArchive : ArcFile
{
public readonly uint Key1;
public readonly uint Key2;
public DpkArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, DpkOptions opt)
: base (arc, impl, dir)
{
Key1 = opt.Key1;
Key2 = opt.Key2;
}
}
[Export(typeof(ArchiveFormat))]
public class DpkOpener : ArchiveFormat
{
public override string Tag { get { return "DPK"; } }
public override string Description { get { return "DAC engine resource archive"; } }
public override uint Signature { get { return 0x004b5044; } } // 'DPK'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public static DpkScheme[] KnownSchemes = new DpkScheme[0];
public override ArcFile TryOpen (ArcView file)
{
var header = new byte[8];
if (8 != file.View.Read (8, header, 0, 8))
return null;
byte last = header[7];
for (int i = 0; i < 8; i++)
{
header[i] ^= (byte)(i - 8);
}
int data_offset = LittleEndian.ToInt32 (header, 0);
if (data_offset <= 16 || data_offset >= file.MaxOffset)
return null;
int index_length = data_offset - 16;
var index = new byte[index_length];
if (index_length != file.View.Read (16, index, 0, (uint)index_length))
return null;
DecryptIndex (index, 16, index_length, last);
int count = LittleEndian.ToInt32 (index, 0);
if (count <= 0 || count > 0xfffff)
return null;
var options = Query<DpkOptions> (arcStrings.ArcEncryptedNotice);
var name_bytes = new byte[0x20];
var dir = new List<Entry> (count);
int base_offset = 4 + count * 4;
for (int i = 0; i < count; ++i)
{
var index_offset = base_offset + LittleEndian.ToInt32 (index, 4+i*4);
int name_begin = index_offset+0x0c;
int name_end = Array.IndexOf (index, (byte)0, name_begin);
if (-1 == name_end)
name_end = index.Length;
if (name_end == name_begin)
continue;
if ('z' == index[name_end-1])
--name_end; // strip 'z' from file extensions
int name_length = name_end - name_begin;
var name = Encodings.cp932.GetString (index, name_begin, name_length);
if (name_length > name_bytes.Length)
name_bytes = new byte[name_length];
// shift-jis characters sequence may contain '\\' that is not a path delimiter
string name_base = Path.GetFileName (name);
name_length = Encodings.cp932.GetBytes (name_base, 0, name_base.Length, name_bytes, 0);
uint size = LittleEndian.ToUInt32 (index, index_offset + 4);
var entry = new DpkEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Hash = GetNameHash (name_bytes, 0, name_length, options.Key1, options.Key2, size),
Offset = data_offset + LittleEndian.ToUInt32 (index, index_offset),
Size = size,
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
if (0 == dir.Count)
return null;
return new DpkArchive (file, this, dir, options);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var parc = arc as DpkArchive;
var pentry = entry as DpkEntry;
if (null == parc || null == pentry)
return arc.File.CreateStream (entry.Offset, entry.Size);
var data = new byte[entry.Size];
arc.File.View.Read (entry.Offset, data, 0, entry.Size);
DecryptEntry (data, parc.Key1, parc.Key2, pentry);
2016-10-16 13:22:53 +08:00
return new BinMemoryStream (data, entry.Name);
}
private void DecryptIndex (byte[] buf, int base_offset, int length, byte last)
{
for (int i = 0; i < length; i++)
{
int key = base_offset + i + last;
last = buf[i];
buf[i] ^= (byte)key;
}
}
private void DecryptEntry (byte[] data, uint key1, uint key2, DpkEntry entry)
{
for (uint i = 0; i < data.Length; ++i)
{
data[i] ^= (byte)(key1 + (key1 >> 8));
data[i] -= (byte)entry.Hash;
key1 += key2;
}
}
private uint GetNameHash (byte[] name, int begin, int length, uint key1, uint key2, uint entry_size)
{
uint hash = 0;
for (int i = begin+length-1; i >= begin; --i)
{
hash += key1 + key2 * (entry_size + name[i]);
}
return hash;
}
public override ResourceOptions GetDefaultOptions ()
{
return new DpkOptions {
Key1 = Settings.Default.DPKKey1,
Key2 = Settings.Default.DPKKey2,
};
}
public override ResourceOptions GetOptions (object w)
{
var widget = w as GUI.WidgetDPK;
if (null != widget)
{
uint result_key;
if (uint.TryParse (widget.Key1.Text, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out result_key))
Settings.Default.DPKKey1 = result_key;
if (uint.TryParse (widget.Key2.Text, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out result_key))
Settings.Default.DPKKey2 = result_key;
}
return this.GetDefaultOptions();
}
public override object GetAccessWidget ()
{
return new GUI.WidgetDPK();
}
public override ResourceScheme Scheme
{
get
{
var known = KnownSchemes.Clone() as DpkScheme[];
// first entry should be a default scheme, replace localized "Name" field
known[0] = new DpkScheme { Name = known[0].Name, Key1 = known[0].Key1, Key2 = known[0].Key2 };
return new ArchiveScheme { KnownSchemes = known };
}
set
{
KnownSchemes = ((ArchiveScheme)value).KnownSchemes;
if (string.IsNullOrEmpty (KnownSchemes[0].Name))
KnownSchemes[0].Name = arcStrings.ArcDefault;
}
}
}
}