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