mirror of
https://github.com/crskycode/GARbro.git
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248 lines
8.7 KiB
C#
248 lines
8.7 KiB
C#
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//! \file ArcBIN.cs
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//! \date 2019 Feb 23
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//! \brief Unity binary data asset.
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//
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// Copyright (C) 2019 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;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using GameRes.Utility;
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namespace GameRes.Formats.Unity
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{
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internal class BinArchive : ArcFile
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{
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public readonly Aes Encryption;
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public BinArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, Aes enc)
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: base (arc, impl, dir)
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{
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Encryption = enc;
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}
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#region IDisposable Members
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bool _bin_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (_bin_disposed)
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return;
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if (disposing)
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Encryption.Dispose();
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_bin_disposed = true;
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base.Dispose (disposing);
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}
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#endregion
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}
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[Serializable]
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public class BinPackKey
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{
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public byte[] Key;
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public byte[] IV;
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public BinPackKey (string key, string iv)
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{
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Key = Encoding.UTF8.GetBytes (key);
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IV = Encoding.UTF8.GetBytes (iv);
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}
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}
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[Serializable]
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public class BinPackScheme : ResourceScheme
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{
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public Dictionary<string, BinPackKey> KnownKeys;
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}
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[Export(typeof(ArchiveFormat))]
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public class BinOpener : ArchiveFormat
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{
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public override string Tag { get { return "BIN/IDX"; } }
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public override string Description { get { return "Unity engine resource asset"; } }
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public override uint Signature { get { return 0; } }
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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 override ArcFile TryOpen (ArcView file)
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{
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if (!file.Name.HasExtension (".bin"))
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return null;
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var idx_name = Path.ChangeExtension (file.Name, "idx");
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if (!VFS.FileExists (idx_name))
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return null;
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var scheme = QueryScheme (file.Name);
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if (null == scheme)
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return null;
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var dir = new List<Entry>();
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using (var idx = VFS.OpenBinaryStream (idx_name))
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using (var aes = Aes.Create())
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{
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aes.Padding = PaddingMode.PKCS7;
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aes.Mode = CipherMode.CBC;
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aes.KeySize = 128;
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aes.Key = scheme.Key;
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aes.IV = scheme.IV;
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var input_buffer = new byte[0x100];
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var unpacker = new BinDeserializer();
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while (idx.PeekByte() != -1)
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{
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int length = idx.ReadInt32();
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if (length <= 0)
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return null;
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if (length > input_buffer.Length)
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input_buffer = new byte[length];
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if (idx.Read (input_buffer, 0, length) < length)
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return null;
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using (var decryptor = aes.CreateDecryptor())
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using (var encrypted = new MemoryStream (input_buffer, 0, length))
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using (var input = new InputCryptoStream (encrypted, decryptor))
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{
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var info = unpacker.DeserializeEntry (input);
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var filename = info["fileName"] as string;
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if (string.IsNullOrEmpty (filename))
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return null;
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filename = filename.TrimStart ('/', '\\');
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var entry = Create<Entry> (filename);
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entry.Offset = Convert.ToInt64 (info["index"]);
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entry.Size = Convert.ToUInt32 (info["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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}
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}
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if (0 == dir.Count)
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return null;
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var arc_aes = Aes.Create();
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arc_aes.Padding = PaddingMode.PKCS7;
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arc_aes.Mode = CipherMode.CBC;
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arc_aes.KeySize = 256;
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arc_aes.Key = scheme.Key;
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arc_aes.IV = scheme.IV;
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return new BinArchive (file, this, dir, arc_aes);
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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 bin_arc = (BinArchive)arc;
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var decryptor = bin_arc.Encryption.CreateDecryptor();
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var input = arc.File.CreateStream (entry.Offset, entry.Size);
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return new InputCryptoStream (input, decryptor);
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}
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BinPackKey QueryScheme (string arc_name)
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{
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return DefaultScheme.KnownKeys.Values.FirstOrDefault();
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}
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static BinPackScheme DefaultScheme = new BinPackScheme { KnownKeys = new Dictionary<string, BinPackKey>() };
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public override ResourceScheme Scheme
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{
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get { return DefaultScheme; }
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set { DefaultScheme = (BinPackScheme)value; }
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}
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}
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internal class BinDeserializer
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{
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byte[] m_buffer = new byte[0x20];
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public IDictionary DeserializeEntry (Stream input)
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{
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int id = input.ReadByte();
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if (id < 0x80 || id > 0x8F)
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throw new FormatException();
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int field_count = id & 0xF;
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var map = new Hashtable (field_count);
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for (int i = 0; i < field_count; ++i)
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{
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id = input.ReadByte();
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if (id < 0xA0 || id > 0xBF)
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throw new FormatException();
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int length = id & 0x1F;
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if (input.Read (m_buffer, 0, length) < length)
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throw new FormatException();
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var key = Encoding.UTF8.GetString (m_buffer, 0, length);
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var value = ReadField (input);
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map[key] = value;
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}
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return map;
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}
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object ReadField (Stream input)
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{
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int id = input.ReadByte();
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if (id >= 0 && id < 0x80)
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{
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return id;
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}
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else if (id >= 0xA0 && id < 0xC0)
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{
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int length = id & 0x1F;
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return ReadString (input, length);
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}
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switch (id)
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{
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case 0xD0: // Int8
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int value = input.ReadByte();
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if (-1 == value)
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throw new FormatException();
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return (sbyte)value;
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case 0xD1: // Int16
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if (input.Read (m_buffer, 0, 2) < 2)
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throw new FormatException();
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return BigEndian.ToInt16 (m_buffer, 0);
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case 0xD2: // Int32
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if (input.Read (m_buffer, 0, 4) < 4)
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throw new FormatException();
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return BigEndian.ToInt32 (m_buffer, 0);
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case 0xDA: // Raw16
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if (input.Read (m_buffer, 0, 2) < 2)
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throw new FormatException();
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int length = BigEndian.ToUInt16 (m_buffer, 0);
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return ReadString (input, length);
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default:
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throw new FormatException();
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}
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}
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string ReadString (Stream input, int length)
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{
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if (length > m_buffer.Length)
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m_buffer = new byte[(length + 0xF) & ~0xF];
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input.Read (m_buffer, 0, length);
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return Encoding.UTF8.GetString (m_buffer, 0, length);
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}
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}
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}
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