mirror of
https://github.com/crskycode/GARbro.git
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434 lines
15 KiB
C#
434 lines
15 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.Composition;
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using System.Collections.Generic;
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using System.Diagnostics;
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using Simias.Encryption;
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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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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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}
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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 IntOpener.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; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return true; } }
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public override ArcFile TryOpen (ArcView file)
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{
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uint entry_count = file.View.ReadUInt32 (4);
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if (0 == entry_count || 0 != ((entry_count - 1) >> 0x14))
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{
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Trace.WriteLine (string.Format ("Invalid entry count ({0})", entry_count));
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return null;
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}
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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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long current_offset = 8;
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var dir = new List<Entry> ((int)entry_count);
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for (uint i = 0; i < entry_count; ++i)
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{
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string name = file.View.ReadString (current_offset, 0x40);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = file.View.ReadUInt32 (current_offset+0x40);
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entry.Size = file.View.ReadUInt32 (current_offset+0x44);
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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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current_offset += 0x48;
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}
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return new ArcFile (file, this, dir);
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}
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private ArcFile OpenEncrypted (ArcView file, uint 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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var twister = new Twister();
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// [@@L1] = 32-bit key
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// [@@L1+4] = 0 if key is available, -1 otherwise
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uint key_data = file.View.ReadUInt32 (current_offset+0x44);
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uint twist_key = twister.Twist (key_data);
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// [@@L0] = 32-bit twist key
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byte[] blowfish_key = BitConverter.GetBytes (twist_key);
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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> ((int)entry_count-1);
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byte[] name_info = new byte[0x40];
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for (uint 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_info, 0, 0x40);
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uint eax = file.View.ReadUInt32 (current_offset+0x40);
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uint edx = file.View.ReadUInt32 (current_offset+0x44);
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eax += i;
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blowfish.Decipher (ref eax, ref edx);
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uint key = twister.Twist (main_key + i);
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string name = DecipherName (name_info, key);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = eax;
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entry.Size = edx;
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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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using (var view = arc.File.CreateViewAccessor (entry.Offset, entry.Size))
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{
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byte[] data = new byte[entry.Size];
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// below is supposedly faster version of
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//arc.File.View.Read (entry.Offset, data, 0, entry.Size);
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unsafe
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{
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byte* ptr = view.GetPointer (entry.Offset);
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try {
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Marshal.Copy (new IntPtr(ptr), data, 0, data.Length);
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} finally {
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view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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}
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arc.Encryption.Decipher (data, data.Length/8*8);
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return new MemoryStream (data, false);
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}
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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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key += (key >> 8) + (key >> 16) + (key >> 24);
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key &= 0xff;
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key %= 0x34;
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int count = 0;
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for (int i = 0; i < name.Length; ++i)
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{
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byte al = name[i];
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if (0 == al)
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break;
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byte bl = (byte)key;
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++count;
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uint edx = al;
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al |= 0x20;
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al -= 0x61;
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if (al < 0x1a)
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{
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if (0 != (edx & 0x20))
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al += 0x1a;
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al = (byte)~al;
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al += 0x34;
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if (al >= bl)
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al -= bl;
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else
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al = (byte)(al - bl + 0x34);
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if (al >= 0x1a)
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al += 6;
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al += 0x41;
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name[i] = al;
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}
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++key;
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if (0x34 == key)
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key = 0;
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}
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return Encodings.cp932.GetString (name, 0, count);
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}
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class Twister
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{
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const uint TwisterLength = 0x270;
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uint[] m_twister = new uint[TwisterLength];
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uint m_twister_pos = 0;
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public uint Twist (uint key)
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{
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Init (key);
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return Next();
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}
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public void Init (uint key)
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{
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uint edx = key;
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for (int i = 0; i < TwisterLength; ++i)
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{
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uint ecx = edx * 0x10dcd + 1;
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m_twister[i] = (edx & 0xffff0000) | (ecx >> 16);
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edx *= 0x1C587629;
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edx += 0x10dce;
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}
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m_twister_pos = 0;
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}
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public uint Next ()
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{
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uint ecx = m_twister[m_twister_pos];
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uint edx = m_twister_pos + 1;
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if (TwisterLength == edx)
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edx = 0;
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uint edi = m_twister[edx];
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edi = ((edi ^ ecx) & 0x7FFFFFFF) ^ ecx;
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bool carry = 0 != (edi & 1);
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edi >>= 1;
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if (carry)
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edi ^= 0x9908B0DF;
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ecx = m_twister_pos + 0x18d;
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if (ecx >= TwisterLength)
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ecx -= TwisterLength;
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edi ^= m_twister[ecx];
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m_twister[m_twister_pos] = edi;
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m_twister_pos = edx;
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uint eax = edi ^ (edi >> 11);
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eax = ((eax & 0xFF3A58AD) << 7) ^ eax;
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eax = ((eax & 0xFFFFDF8C) << 15) ^ eax;
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eax = (eax >> 18) ^ eax;
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return eax;
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}
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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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uint val = (uint)c << 24;
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key ^= val;
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for (int i = 0; i < 8; ++i)
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{
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bool carry = 0 != (key & 0x80000000);
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key <<= 1;
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if (carry)
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key ^= 0x4C11DB7;
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}
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key = ~key;
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}
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return key;
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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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}
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}
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