mirror of
https://github.com/crskycode/GARbro.git
synced 2024-12-29 14:24:13 +08:00
352 lines
12 KiB
C#
352 lines
12 KiB
C#
//! \file ArcCSAF.cs
|
|
//! \date 2019 Jan 01
|
|
//! \brief Family Adv System resource archive.
|
|
//
|
|
// Copyright (C) 2019 by morkt
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to
|
|
// deal in the Software without restriction, including without limitation the
|
|
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
// sell copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
// IN THE SOFTWARE.
|
|
//
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.ComponentModel.Composition;
|
|
using System.IO;
|
|
using System.Linq;
|
|
using System.Security.Cryptography;
|
|
using System.Text;
|
|
using GameRes.Utility;
|
|
|
|
namespace GameRes.Formats.FamilyAdvSystem
|
|
{
|
|
|
|
[Export(typeof(ArchiveFormat))]
|
|
public class CsafOpener : ArchiveFormat
|
|
{
|
|
public override string Tag { get { return "CSAF"; } }
|
|
public override string Description { get { return "Family Adv System resource archive"; } }
|
|
public override uint Signature { get { return 0x46415343; } } // 'CSAF'
|
|
public override bool IsHierarchic { get { return true; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
|
|
public CsafOpener ()
|
|
{
|
|
Extensions = new string[] { "" };
|
|
}
|
|
|
|
static readonly string DefaultKey = "江ノ島の南";
|
|
static readonly byte[] DefaultIV = Encoding.ASCII.GetBytes ("FamilyAdvSystem ");
|
|
|
|
public override ArcFile TryOpen (ArcView file)
|
|
{
|
|
uint flags = file.View.ReadUInt32 (4);
|
|
if ((flags & 0x7FFFFFFF) != 0x10000)
|
|
return null;
|
|
int count = file.View.ReadInt32 (8);
|
|
if (!IsSaneCount (count))
|
|
return null;
|
|
bool is_encrypted = (flags >> 31) != 0;
|
|
uint index_size = (uint)((count * 24 + 31) & -4096) + 0xFE0u;
|
|
uint names_size = file.View.ReadUInt32 (12);
|
|
var arc_md5 = file.View.ReadBytes (0x10, 0x10);
|
|
var index = new byte[index_size + names_size];
|
|
CsafEncryption enc = null;
|
|
try
|
|
{
|
|
if (is_encrypted)
|
|
{
|
|
file.View.Read (0x20, index, 0, index_size);
|
|
enc = new CsafEncryption (DefaultKey, DefaultIV);
|
|
using (var decryptor = enc.CreateDecryptor (0))
|
|
using (var enc_names = file.CreateStream (0x20 + index_size, names_size))
|
|
using (var dec_names = new InputCryptoStream (enc_names, decryptor))
|
|
{
|
|
dec_names.Read (index, (int)index_size, (int)names_size);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
file.View.Read (0x20, index, 0, index_size + names_size);
|
|
}
|
|
using (var md5 = MD5.Create())
|
|
{
|
|
var hash = md5.ComputeHash (index);
|
|
if (!hash.SequenceEqual (arc_md5))
|
|
return null;
|
|
int index_pos = 0x10;
|
|
int name_pos = (int)index_size;
|
|
var dir = new List<Entry> (count);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
int j;
|
|
for (j = name_pos; j+1 < index.Length; j += 2)
|
|
{
|
|
if (index[j] == 0 && index[j+1] == 0)
|
|
break;
|
|
}
|
|
int name_length = j - name_pos;
|
|
var name = Encoding.Unicode.GetString (index, name_pos, name_length);
|
|
// hash = md5.ComputeHash (index, name_pos, name_length); // == [index_pos-0x10]
|
|
name_pos += name_length + 10;
|
|
|
|
var entry = Create<Entry> (name);
|
|
entry.Offset = (long)index.ToUInt32 (index_pos) << 12;
|
|
entry.Size = index.ToUInt32 (index_pos+4);
|
|
index_pos += 0x18;
|
|
if (!entry.CheckPlacement (file.MaxOffset))
|
|
return null;
|
|
dir.Add (entry);
|
|
}
|
|
if (!is_encrypted)
|
|
return new ArcFile (file, this, dir);
|
|
var arc = new CsafArchive (file, this, dir, enc);
|
|
enc = null;
|
|
return arc;
|
|
}
|
|
}
|
|
finally
|
|
{
|
|
if (enc != null)
|
|
enc.Dispose();
|
|
}
|
|
}
|
|
|
|
public override Stream OpenEntry (ArcFile arc, Entry entry)
|
|
{
|
|
if (0 == entry.Size)
|
|
return Stream.Null;
|
|
var carc = arc as CsafArchive;
|
|
if (null == carc)
|
|
return base.OpenEntry (arc, entry);
|
|
var input = new CsafStream (carc);
|
|
return new StreamRegion (input, entry.Offset, entry.Size);
|
|
}
|
|
}
|
|
|
|
internal class CsafEncryption : IDisposable
|
|
{
|
|
Aes m_aes;
|
|
MD5 m_md5;
|
|
byte[] m_key;
|
|
byte[] m_iv;
|
|
|
|
public CsafEncryption (string password, byte[] iv)
|
|
{
|
|
m_md5 = MD5.Create();
|
|
m_aes = Aes.Create();
|
|
m_aes.Mode = CipherMode.CBC;
|
|
m_aes.Padding = PaddingMode.None;
|
|
m_key = InitKey (password);
|
|
m_iv = iv;
|
|
}
|
|
|
|
public ICryptoTransform CreateDecryptor (int block_num)
|
|
{
|
|
var block_key = GetBlockKey (block_num);
|
|
return m_aes.CreateDecryptor (block_key, m_iv);
|
|
}
|
|
|
|
byte[] InitKey (string pass_phrase)
|
|
{
|
|
var key = new byte[32];
|
|
if (!string.IsNullOrEmpty (pass_phrase))
|
|
{
|
|
var bytes = Encoding.Unicode.GetBytes (pass_phrase);
|
|
var hash = m_md5.ComputeHash (bytes);
|
|
Buffer.BlockCopy (hash, 0, key, 0, 16);
|
|
hash = m_md5.ComputeHash (bytes, 1, bytes.Length - 2);
|
|
Buffer.BlockCopy (hash, 0, key, 16, 16);
|
|
}
|
|
return key;
|
|
}
|
|
|
|
byte[] GetBlockKey (int block_num)
|
|
{
|
|
int offset = block_num / 8;
|
|
int shift = block_num & 7;
|
|
var key = new byte[32];
|
|
var buf = new byte[16];
|
|
for (int i = 0; i < 16; ++i)
|
|
{
|
|
buf[i] = Binary.RotByteL (m_key[(offset + i) & 0xF], shift);
|
|
}
|
|
var hash = m_md5.ComputeHash (buf, 0, 16);
|
|
Buffer.BlockCopy (hash, 0, key, 0, 16);
|
|
for (int i = 0; i < 16; ++i)
|
|
{
|
|
buf[i] = Binary.RotByteL (m_key[16 + ((offset + i) & 0xF)], shift);
|
|
}
|
|
hash = m_md5.ComputeHash (buf, 0, 16);
|
|
Buffer.BlockCopy (hash, 0, key, 16, 16);
|
|
return key;
|
|
}
|
|
|
|
#region IDisposable Members
|
|
bool m_disposed = false;
|
|
public void Dispose ()
|
|
{
|
|
if (!m_disposed)
|
|
{
|
|
m_aes.Dispose();
|
|
m_md5.Dispose();
|
|
m_disposed = true;
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
|
|
internal class CsafArchive : ArcFile
|
|
{
|
|
public readonly CsafEncryption Encryption;
|
|
|
|
public CsafArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, CsafEncryption enc)
|
|
: base (arc, impl, dir)
|
|
{
|
|
Encryption = enc;
|
|
}
|
|
|
|
#region IDisposable Members
|
|
bool _csaf_disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (_csaf_disposed)
|
|
return;
|
|
|
|
if (disposing)
|
|
Encryption.Dispose();
|
|
_csaf_disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
#endregion
|
|
}
|
|
|
|
internal class CsafStream : Stream
|
|
{
|
|
readonly long m_length;
|
|
ArcView.Frame m_view;
|
|
CsafEncryption m_encryption;
|
|
long m_position = 0;
|
|
byte[] m_block = new byte[0x1000];
|
|
long m_block_start = 0;
|
|
int m_block_length = 0;
|
|
|
|
public override bool CanRead { get { return true; } }
|
|
public override bool CanSeek { get { return true; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
|
|
public CsafStream (CsafArchive arc)
|
|
{
|
|
m_length = arc.File.MaxOffset;
|
|
m_view = arc.File.CreateFrame();
|
|
m_encryption = arc.Encryption;
|
|
}
|
|
|
|
public override int Read (byte[] buffer, int offset, int count)
|
|
{
|
|
int read = 0;
|
|
while (count > 0)
|
|
{
|
|
if (!(m_position >= m_block_start && m_position < m_block_start + m_block_length))
|
|
{
|
|
if (!ReadBlock())
|
|
break;
|
|
}
|
|
int block_pos = (int)m_position & 0xFFF;
|
|
int avail = Math.Min (count, m_block_length - block_pos);
|
|
Buffer.BlockCopy (m_block, block_pos, buffer, offset, avail);
|
|
m_position += avail;
|
|
offset += avail;
|
|
read += avail;
|
|
count -= avail;
|
|
}
|
|
return read;
|
|
}
|
|
|
|
bool ReadBlock ()
|
|
{
|
|
if (m_position >= m_length)
|
|
return false;
|
|
m_block_start = m_position & ~0xFFFL;
|
|
m_block_length = m_view.Read (m_block_start, m_block, 0, 0x1000);
|
|
if (m_block_length != 0x1000)
|
|
return false;
|
|
using (var decryptor = m_encryption.CreateDecryptor ((int)(m_block_start >> 12)))
|
|
using (var enc = new BinMemoryStream (m_block))
|
|
using (var dec = new InputCryptoStream (enc, decryptor))
|
|
dec.Read (m_block, 0, m_block_length);
|
|
return true;
|
|
}
|
|
|
|
#region IO.Stream members
|
|
public override long Length { get { return m_length; } }
|
|
public override long Position
|
|
{
|
|
get { return m_position; }
|
|
set { m_position = value; }
|
|
}
|
|
|
|
public override void Flush ()
|
|
{
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
if (SeekOrigin.Begin == origin)
|
|
Position = offset;
|
|
else if (SeekOrigin.Current == origin)
|
|
Position = m_position + offset;
|
|
else
|
|
Position = m_length + offset;
|
|
|
|
return m_position;
|
|
}
|
|
|
|
public override void SetLength (long length)
|
|
{
|
|
throw new NotSupportedException ("CsafStream.SetLength method is not supported");
|
|
}
|
|
|
|
public override void Write (byte[] buffer, int offset, int count)
|
|
{
|
|
throw new NotSupportedException ("CsafStream.Write method is not supported");
|
|
}
|
|
|
|
public override void WriteByte (byte value)
|
|
{
|
|
throw new NotSupportedException("CsafStream.WriteByte method is not supported");
|
|
}
|
|
#endregion
|
|
|
|
#region IDisposable Members
|
|
bool _disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!_disposed)
|
|
{
|
|
if (disposing)
|
|
{
|
|
m_view.Dispose();
|
|
}
|
|
_disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
}
|