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//! \file ArcINT.cs
//! \date Fri Jul 11 09:32:36 2014
//! \brief Frontwing games archive.
//
// Copyright (C) 2014 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.IO;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.ComponentModel.Composition;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using GameRes.Formats.Strings;
using GameRes.Formats.Properties;
using GameRes.Cryptography;
using GameRes.Utility;
namespace GameRes.Formats.CatSystem
{
public class FrontwingArchive : ArcFile
{
public readonly Blowfish Encryption;
public FrontwingArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, Blowfish cipher)
: base (arc, impl, dir)
{
Encryption = cipher;
}
}
[Serializable]
public struct KeyData
{
public uint Key;
public string Passphrase;
public KeyData (string password)
{
Passphrase = password;
Key = EncodePassPhrase (password);
}
public static uint EncodePassPhrase (string password)
{
byte[] pass_bytes = Encodings.cp932.GetBytes (password);
uint key = 0xffffffff;
foreach (var c in pass_bytes)
{
key = ~Crc32Normal.Table[(key >> 24) ^ c] ^ (key << 8);
}
return key;
}
}
[Serializable]
public class IntScheme : ResourceScheme
{
public Dictionary<string, KeyData> KnownKeys;
}
[Serializable]
public class IntEncryptionInfo
{
public uint? Key { get; set; }
public string Scheme { get; set; }
public string Password { get; set; }
public uint? GetKey ()
{
if (null != Key && Key.HasValue)
return Key;
if (!string.IsNullOrEmpty (Scheme))
{
KeyData keydata;
if (IntOpener.KnownSchemes.TryGetValue (Scheme, out keydata))
return keydata.Key;
}
if (!string.IsNullOrEmpty (Password))
return KeyData.EncodePassPhrase (Password);
return null;
}
}
public class IntOptions : ResourceOptions
{
public IntEncryptionInfo EncryptionInfo { get; set; }
}
[Export(typeof(ArchiveFormat))]
public class IntOpener : ArchiveFormat
{
public override string Tag { get { return "INT"; } }
public override string Description { get { return arcStrings.INTDescription; } }
public override uint Signature { get { return 0x0046494b; } } // 'KIF'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return true; } }
static readonly byte[] NameSizes = { 0x20, 0x40 };
public override ArcFile TryOpen (ArcView file)
{
int entry_count = file.View.ReadInt32 (4);
if (!IsSaneCount (entry_count))
return null;
if (file.View.AsciiEqual (8, "__key__.dat\x00"))
{
uint? key = QueryEncryptionInfo();
if (null == key)
throw new UnknownEncryptionScheme();
return OpenEncrypted (file, entry_count, key.Value);
}
var dir = new List<Entry> (entry_count);
foreach (var name_length in NameSizes)
{
try
{
long current_offset = 8;
for (int i = 0; i < entry_count; ++i)
{
string name = file.View.ReadString (current_offset, name_length);
if (0 == name.Length)
{
dir.Clear();
break;
}
var entry = FormatCatalog.Instance.Create<Entry> (name);
current_offset += name_length;
entry.Offset = file.View.ReadUInt32 (current_offset);
entry.Size = file.View.ReadUInt32 (current_offset+4);
if (entry.Offset <= current_offset || !entry.CheckPlacement (file.MaxOffset))
{
dir.Clear();
break;
}
dir.Add (entry);
current_offset += 8;
}
if (dir.Count > 0)
return new ArcFile (file, this, dir);
}
catch { /* ignore parse errors */ }
}
return null;
}
private ArcFile OpenEncrypted (ArcView file, int entry_count, uint main_key)
{
if (1 == entry_count)
return null; // empty archive
long current_offset = 8;
uint seed = file.View.ReadUInt32 (current_offset+0x44);
var twister = new MersenneTwister (seed);
byte[] blowfish_key = BitConverter.GetBytes (twister.Rand());
if (!BitConverter.IsLittleEndian)
Array.Reverse (blowfish_key);
var blowfish = new Blowfish (blowfish_key);
var dir = new List<Entry> (entry_count-1);
byte[] name_buffer = new byte[0x40];
for (int i = 1; i < entry_count; ++i)
{
current_offset += 0x48;
file.View.Read (current_offset, name_buffer, 0, 0x40);
uint offset = file.View.ReadUInt32 (current_offset+0x40) + (uint)i;
uint size = file.View.ReadUInt32 (current_offset+0x44);
blowfish.Decipher (ref offset, ref size);
twister.SRand (main_key + (uint)i);
uint name_key = twister.Rand();
string name = DecipherName (name_buffer, name_key);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = size;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
return new FrontwingArchive (file, this, dir, blowfish);
}
private Stream OpenEncryptedEntry (FrontwingArchive arc, Entry entry)
{
byte[] data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
arc.Encryption.Decipher (data, data.Length/8*8);
2016-10-16 09:22:53 +04:00
return new BinMemoryStream (data, entry.Name);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (arc is FrontwingArchive)
return OpenEncryptedEntry (arc as FrontwingArchive, entry);
else
return base.OpenEntry (arc, entry);
}
public string DecipherName (byte[] name, uint key)
{
string alphabet = "zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA";
int k = (byte)((key >> 24) + (key >> 16) + (key >> 8) + key);
int i;
for (i = 0; i < name.Length && name[i] != 0; ++i)
{
int j = alphabet.IndexOf ((char)name[i]);
if (j != -1)
{
j -= k % 0x34;
if (j < 0) j += 0x34;
name[i] = (byte)alphabet[0x33-j];
}
++k;
}
return Encodings.cp932.GetString (name, 0, i);
}
public static Dictionary<string, KeyData> KnownSchemes = new Dictionary<string, KeyData>();
public override ResourceScheme Scheme
{
get { return new IntScheme { KnownKeys = KnownSchemes }; }
set { KnownSchemes = ((IntScheme)value).KnownKeys; }
}
public override ResourceOptions GetDefaultOptions ()
{
return new IntOptions {
EncryptionInfo = Settings.Default.INTEncryption ?? new IntEncryptionInfo(),
};
}
public override ResourceOptions GetOptions (object w)
{
var widget = w as GUI.WidgetINT;
if (null != widget)
{
Settings.Default.INTEncryption = widget.Info;
return new IntOptions { EncryptionInfo = widget.Info };
}
return this.GetDefaultOptions();
}
public override object GetAccessWidget ()
{
return new GUI.WidgetINT ();
}
public override object GetCreationWidget ()
{
return new GUI.CreateINTWidget();
}
uint? QueryEncryptionInfo ()
{
var options = Query<IntOptions> (arcStrings.INTNotice);
return options.EncryptionInfo.GetKey();
}
public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
EntryCallback callback)
{
int file_count = list.Count();
if (null != callback)
callback (file_count+2, null, null);
int callback_count = 0;
using (var writer = new BinaryWriter (output, Encoding.ASCII, true))
{
writer.Write (Signature);
writer.Write (file_count);
long dir_offset = output.Position;
var encoding = Encodings.cp932.WithFatalFallback();
byte[] name_buf = new byte[0x40];
int previous_size = 0;
if (null != callback)
callback (callback_count++, null, arcStrings.MsgWritingIndex);
// first, write names only
foreach (var entry in list)
{
string name = Path.GetFileName (entry.Name);
try
{
int size = encoding.GetBytes (name, 0, name.Length, name_buf, 0);
for (int i = size; i < previous_size; ++i)
name_buf[i] = 0;
previous_size = size;
}
catch (EncoderFallbackException X)
{
throw new InvalidFileName (entry.Name, arcStrings.MsgIllegalCharacters, X);
}
catch (ArgumentException X)
{
throw new InvalidFileName (entry.Name, arcStrings.MsgFileNameTooLong, X);
}
writer.Write (name_buf);
writer.BaseStream.Seek (8, SeekOrigin.Current);
}
// now, write files and remember offset/sizes
long current_offset = output.Position;
foreach (var entry in list)
{
if (null != callback)
callback (callback_count++, entry, arcStrings.MsgAddingFile);
entry.Offset = current_offset;
using (var input = File.OpenRead (entry.Name))
{
var size = input.Length;
if (size > uint.MaxValue || current_offset + size > uint.MaxValue)
throw new FileSizeException();
current_offset += (uint)size;
entry.Size = (uint)size;
input.CopyTo (output);
}
}
if (null != callback)
callback (callback_count++, null, arcStrings.MsgUpdatingIndex);
// at last, go back to directory and write offset/sizes
dir_offset += 0x40;
foreach (var entry in list)
{
writer.BaseStream.Position = dir_offset;
writer.Write ((uint)entry.Offset);
writer.Write (entry.Size);
dir_offset += 0x48;
}
}
}
/// <summary>
/// Parse certain executable resources for encryption passphrase.
/// Returns null if no passphrase found.
/// </summary>
public static string GetPassFromExe (string filename)
{
using (var exe = new ExeFile.ResourceAccessor (filename))
{
var code = exe.GetResource ("DATA", "V_CODE2");
if (null == code || code.Length < 8)
return null;
var key = exe.GetResource ("KEY", "KEY_CODE");
if (null != key)
{
for (int i = 0; i < key.Length; ++i)
key[i] ^= 0xCD;
}
else
{
key = Encoding.ASCII.GetBytes ("windmill");
}
var blowfish = new Blowfish (key);
blowfish.Decipher (code, code.Length/8*8);
int length = Array.IndexOf<byte> (code, 0);
if (-1 == length)
length = code.Length;
return Encodings.cp932.GetString (code, 0, length);
}
}
}
}