mirror of
https://github.com/crskycode/GARbro.git
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352 lines
12 KiB
C#
352 lines
12 KiB
C#
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//! \file ArcCSAF.cs
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//! \date 2019 Jan 01
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//! \brief Family Adv System resource archive.
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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.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.FamilyAdvSystem
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{
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[Export(typeof(ArchiveFormat))]
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public class CsafOpener : ArchiveFormat
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{
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public override string Tag { get { return "CSAF"; } }
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public override string Description { get { return "Family Adv System resource archive"; } }
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public override uint Signature { get { return 0x46415343; } } // 'CSAF'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public CsafOpener ()
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{
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Extensions = new string[] { "" };
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}
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static readonly string DefaultKey = "江ノ島の南";
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static readonly byte[] DefaultIV = Encoding.ASCII.GetBytes ("FamilyAdvSystem ");
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public override ArcFile TryOpen (ArcView file)
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{
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uint flags = file.View.ReadUInt32 (4);
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if ((flags & 0x7FFFFFFF) != 0x10000)
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return null;
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int count = file.View.ReadInt32 (8);
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if (!IsSaneCount (count))
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return null;
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bool is_encrypted = (flags >> 31) != 0;
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uint index_size = (uint)((count * 24 + 31) & -4096) + 0xFE0u;
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uint names_size = file.View.ReadUInt32 (12);
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var arc_md5 = file.View.ReadBytes (0x10, 0x10);
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var index = new byte[index_size + names_size];
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CsafEncryption enc = null;
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try
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{
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if (is_encrypted)
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{
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file.View.Read (0x20, index, 0, index_size);
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enc = new CsafEncryption (DefaultKey, DefaultIV);
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using (var decryptor = enc.CreateDecryptor (0))
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using (var enc_names = file.CreateStream (0x20 + index_size, names_size))
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using (var dec_names = new InputCryptoStream (enc_names, decryptor))
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{
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dec_names.Read (index, (int)index_size, (int)names_size);
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}
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}
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else
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{
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file.View.Read (0x20, index, 0, index_size + names_size);
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}
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using (var md5 = MD5.Create())
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{
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var hash = md5.ComputeHash (index);
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if (!hash.SequenceEqual (arc_md5))
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return null;
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int index_pos = 0x10;
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int name_pos = (int)index_size;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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int j;
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for (j = name_pos; j+1 < index.Length; j += 2)
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{
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if (index[j] == 0 && index[j+1] == 0)
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break;
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}
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int name_length = j - name_pos;
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var name = Encoding.Unicode.GetString (index, name_pos, name_length);
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// hash = md5.ComputeHash (index, name_pos, name_length); // == [index_pos-0x10]
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name_pos += name_length + 10;
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var entry = Create<Entry> (name);
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entry.Offset = (long)index.ToUInt32 (index_pos) << 12;
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entry.Size = index.ToUInt32 (index_pos+4);
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index_pos += 0x18;
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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 (!is_encrypted)
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return new ArcFile (file, this, dir);
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var arc = new CsafArchive (file, this, dir, enc);
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enc = null;
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return arc;
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}
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}
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finally
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{
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if (enc != null)
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enc.Dispose();
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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 (0 == entry.Size)
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return Stream.Null;
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var carc = arc as CsafArchive;
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if (null == carc)
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return base.OpenEntry (arc, entry);
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var input = new CsafStream (carc);
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return new StreamRegion (input, entry.Offset, entry.Size);
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}
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}
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internal class CsafEncryption : IDisposable
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{
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Aes m_aes;
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MD5 m_md5;
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byte[] m_key;
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byte[] m_iv;
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public CsafEncryption (string password, byte[] iv)
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{
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m_md5 = MD5.Create();
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m_aes = Aes.Create();
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m_aes.Mode = CipherMode.CBC;
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m_aes.Padding = PaddingMode.None;
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m_key = InitKey (password);
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m_iv = iv;
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}
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public ICryptoTransform CreateDecryptor (int block_num)
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{
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var block_key = GetBlockKey (block_num);
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return m_aes.CreateDecryptor (block_key, m_iv);
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}
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byte[] InitKey (string pass_phrase)
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{
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var key = new byte[32];
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if (!string.IsNullOrEmpty (pass_phrase))
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{
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var bytes = Encoding.Unicode.GetBytes (pass_phrase);
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var hash = m_md5.ComputeHash (bytes);
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Buffer.BlockCopy (hash, 0, key, 0, 16);
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hash = m_md5.ComputeHash (bytes, 1, bytes.Length - 2);
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Buffer.BlockCopy (hash, 0, key, 16, 16);
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}
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return key;
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}
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byte[] GetBlockKey (int block_num)
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{
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int offset = block_num / 8;
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int shift = block_num & 7;
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var key = new byte[32];
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var buf = new byte[16];
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for (int i = 0; i < 16; ++i)
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{
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buf[i] = Binary.RotByteL (m_key[(offset + i) & 0xF], shift);
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}
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var hash = m_md5.ComputeHash (buf, 0, 16);
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Buffer.BlockCopy (hash, 0, key, 0, 16);
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for (int i = 0; i < 16; ++i)
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{
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buf[i] = Binary.RotByteL (m_key[16 + ((offset + i) & 0xF)], shift);
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}
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hash = m_md5.ComputeHash (buf, 0, 16);
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Buffer.BlockCopy (hash, 0, key, 16, 16);
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return key;
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}
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#region IDisposable Members
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bool m_disposed = false;
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public void Dispose ()
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{
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if (!m_disposed)
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{
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m_aes.Dispose();
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m_md5.Dispose();
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m_disposed = true;
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}
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}
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#endregion
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}
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internal class CsafArchive : ArcFile
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{
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public readonly CsafEncryption Encryption;
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public CsafArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, CsafEncryption 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 _csaf_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (_csaf_disposed)
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return;
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if (disposing)
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Encryption.Dispose();
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_csaf_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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internal class CsafStream : Stream
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{
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readonly long m_length;
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ArcView.Frame m_view;
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CsafEncryption m_encryption;
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long m_position = 0;
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byte[] m_block = new byte[0x1000];
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long m_block_start = 0;
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int m_block_length = 0;
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public override bool CanRead { get { return true; } }
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public override bool CanSeek { get { return true; } }
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public override bool CanWrite { get { return false; } }
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public CsafStream (CsafArchive arc)
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{
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m_length = arc.File.MaxOffset;
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m_view = arc.File.CreateFrame();
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m_encryption = arc.Encryption;
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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int read = 0;
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while (count > 0)
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{
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if (!(m_position >= m_block_start && m_position < m_block_start + m_block_length))
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{
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if (!ReadBlock())
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break;
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}
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int block_pos = (int)m_position & 0xFFF;
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int avail = Math.Min (count, m_block_length - block_pos);
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Buffer.BlockCopy (m_block, block_pos, buffer, offset, avail);
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m_position += avail;
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offset += avail;
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read += avail;
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count -= avail;
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}
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return read;
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}
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bool ReadBlock ()
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{
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if (m_position >= m_length)
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return false;
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m_block_start = m_position & ~0xFFFL;
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m_block_length = m_view.Read (m_block_start, m_block, 0, 0x1000);
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if (m_block_length != 0x1000)
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return false;
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using (var decryptor = m_encryption.CreateDecryptor ((int)(m_block_start >> 12)))
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using (var enc = new BinMemoryStream (m_block))
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using (var dec = new InputCryptoStream (enc, decryptor))
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dec.Read (m_block, 0, m_block_length);
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return true;
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}
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#region IO.Stream members
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public override long Length { get { return m_length; } }
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public override long Position
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{
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get { return m_position; }
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set { m_position = value; }
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}
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public override void Flush ()
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{
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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if (SeekOrigin.Begin == origin)
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Position = offset;
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else if (SeekOrigin.Current == origin)
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Position = m_position + offset;
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else
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Position = m_length + offset;
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return m_position;
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}
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public override void SetLength (long length)
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{
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throw new NotSupportedException ("CsafStream.SetLength method is not supported");
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException ("CsafStream.Write method is not supported");
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}
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public override void WriteByte (byte value)
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{
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throw new NotSupportedException("CsafStream.WriteByte method is not supported");
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}
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#endregion
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#region IDisposable Members
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bool _disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!_disposed)
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{
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if (disposing)
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{
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m_view.Dispose();
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}
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_disposed = true;
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base.Dispose (disposing);
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}
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}
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#endregion
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}
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}
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