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