GARbro-mirror/ArcFormats/Malie/ArcLIB.cs

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//! \file ArcLIB.cs
//! \date Thu Jun 25 06:46:51 2015
//! \brief Malie System archive implementation.
//
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// Copyright (C) 2015-2016 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;
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using System.Text;
using GameRes.Cryptography;
using GameRes.Utility;
namespace GameRes.Formats.Malie
{
internal interface ILibIndexReader : IDisposable
{
List<Entry> Dir { get; }
bool ReadIndex ();
}
[Export(typeof(ArchiveFormat))]
public class LibOpener : ArchiveFormat
{
public override string Tag { get { return "LIB"; } }
public override string Description { get { return "Malie engine resource archive"; } }
public override uint Signature { get { return 0x0042494C; } } // 'LIB'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
var reader = new Reader (file);
if (reader.ReadIndex ("", 0, (uint)file.MaxOffset))
return new ArcFile (file, this, reader.Dir);
else
return null;
}
internal class Reader
{
ArcView.Frame m_view;
List<Entry> m_dir = new List<Entry>();
public List<Entry> Dir { get { return m_dir; } }
public Reader (ArcView file)
{
m_view = file.View;
}
public bool ReadIndex (string root, long base_offset, uint size)
{
uint signature = m_view.ReadUInt32 (base_offset);
if (0x0042494C != signature)
return false;
int count = m_view.ReadInt16 (base_offset + 8);
if (count <= 0)
return false;
long index_offset = base_offset + 0x10;
uint index_size = (uint)(0x30 * count);
if (index_size > size)
return false;
if (index_size > m_view.Reserve (index_offset, index_size))
return false;
long data_offset = index_offset + index_size;
if (m_dir.Capacity < m_dir.Count + count)
m_dir.Capacity = m_dir.Count + count;
for (int i = 0; i < count; ++i)
{
string name = m_view.ReadString (index_offset, 0x24);
uint entry_size = m_view.ReadUInt32 (index_offset+0x24);
long offset = base_offset + m_view.ReadUInt32 (index_offset+0x28);
index_offset += 0x30;
string ext = Path.GetExtension (name);
name = Path.Combine (root, name);
if (string.IsNullOrEmpty (ext) && ReadIndex (name, offset, entry_size))
{
continue;
}
if (offset < data_offset || offset + entry_size > base_offset + size)
return false;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = entry_size;
m_dir.Add (entry);
}
return true;
}
}
}
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public class MalieArchive : ArcFile
{
public readonly Camellia Encryption;
public MalieArchive (ArcView file, ArchiveFormat format, ICollection<Entry> dir, Camellia encryption)
: base (file, format, dir)
{
Encryption = encryption;
}
}
[Serializable]
public class LibScheme
{
public uint DataAlign;
public uint[] Key;
public LibScheme (uint[] key) : this (0x1000, key)
{
}
public LibScheme (uint align, uint[] key)
{
DataAlign = align;
Key = key;
}
public LibScheme (string key) : this (Camellia.GenerateKey (key))
{
}
public LibScheme (uint align, string key) : this (align, Camellia.GenerateKey (key))
{
}
}
[Serializable]
public class MalieScheme : ResourceScheme
{
public Dictionary<string, LibScheme> KnownSchemes;
}
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[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
public override string Tag { get { return "LIBP"; } }
public override string Description { get { return "Malie engine encrypted archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
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public DatOpener ()
{
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Extensions = new string[] { "lib", "dat" };
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}
public override ArcFile TryOpen (ArcView file)
{
if (file.MaxOffset <= 0x10)
return null;
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var header = new byte[0x10];
foreach (var scheme in KnownSchemes.Values)
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{
var encryption = new Camellia (scheme.Key);
ReadEncrypted (file.View, encryption, 0, header, 0, 0x10);
ILibIndexReader reader;
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if (Binary.AsciiEqual (header, 0, "LIBP"))
reader = new LibPReader (file, encryption, header, scheme);
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else if (Binary.AsciiEqual (header, 0, "LIBU"))
reader = LibUReader.Create (file, encryption);
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else
continue;
using (reader)
{
if (reader.ReadIndex())
return new MalieArchive (file, this, reader.Dir, encryption);
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}
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}
return null;
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var march = arc as MalieArchive;
if (null == march)
return arc.File.CreateStream (entry.Offset, entry.Size);
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var input = new EncryptedStream (march.File, march.Encryption);
return new StreamRegion (input, entry.Offset, entry.Size);
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}
internal abstract class LibIndexReader : ILibIndexReader
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{
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protected ArcView.Frame m_view;
protected readonly long m_max_offset;
protected Camellia m_enc;
protected List<Entry> m_dir = new List<Entry>();
protected byte[] m_header;
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public List<Entry> Dir { get { return m_dir; } }
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protected LibIndexReader (ArcView file, Camellia encryption, byte[] header)
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{
m_view = file.View;
m_max_offset = file.MaxOffset;
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m_enc = encryption;
m_header = header;
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}
public abstract bool ReadIndex ();
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#region IDisposable Members
public void Dispose ()
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{
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Dispose (true);
GC.SuppressFinalize (this);
}
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protected virtual void Dispose (bool disposing)
{
}
#endregion
}
internal class LibPReader : LibIndexReader
{
byte[] m_index;
long m_base_offset;
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long m_data_align;
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uint[] m_offset_table;
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public LibPReader (ArcView file, Camellia encryption, byte[] header, LibScheme scheme)
: base (file, encryption, header)
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{
m_base_offset = 0;
m_data_align = scheme.DataAlign - 1;
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}
public override bool ReadIndex ()
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{
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int count = LittleEndian.ToInt32 (m_header, 4);
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if (!IsSaneCount (count))
return false;
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int offset_count = LittleEndian.ToInt32 (m_header, 8);
m_index = new byte[0x20 * count];
var offsets = new byte[4 * offset_count];
m_base_offset += 0x10;
if (m_index.Length != ReadEncrypted (m_view, m_enc, m_base_offset, m_index, 0, m_index.Length))
return false;
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m_base_offset += m_index.Length;
if (offsets.Length != ReadEncrypted (m_view, m_enc, m_base_offset, offsets, 0, offsets.Length))
return false;
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m_offset_table = new uint[offset_count];
Buffer.BlockCopy (offsets, 0, m_offset_table, 0, offsets.Length);
m_base_offset += offsets.Length;
m_base_offset = (m_base_offset + m_data_align) & ~m_data_align;
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m_dir.Capacity = offset_count;
ReadDir ("", 0, 1);
return m_dir.Count > 0;
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}
private void ReadDir (string root, int entry_index, int count)
{
int current_offset = entry_index * 0x20;
for (int i = 0; i < count; ++i)
{
string name = Binary.GetCString (m_index, current_offset, 0x14);
int flags = LittleEndian.ToInt32 (m_index, current_offset+0x14);
int offset = LittleEndian.ToInt32 (m_index, current_offset+0x18);
uint size = LittleEndian.ToUInt32 (m_index, current_offset+0x1c);
current_offset += 0x20;
name = Path.Combine (root, name);
if (0 == (flags & 0x10000))
{
if (offset > entry_index)
ReadDir (name, (int)offset, (int)size);
continue;
}
long entry_offset = m_base_offset + ((long)m_offset_table[offset] << 10);
var entry = FormatCatalog.Instance.Create<Entry> (name);
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if (entry.CheckPlacement (m_max_offset))
{
entry.Offset = entry_offset;
entry.Size = size;
m_dir.Add (entry);
}
}
}
}
private static int ReadEncrypted (ArcView.Frame view, Camellia enc, long offset, byte[] buffer, int index, int length)
{
int offset_pad = (int)offset & 0xF;
int aligned_len = (offset_pad + length + 0xF) & ~0xF;
byte[] aligned_buf;
int block = 0;
if (aligned_len == length)
{
aligned_buf = buffer;
block = index;
}
else
{
aligned_buf = new byte[aligned_len];
}
int read = view.Read (offset - offset_pad, aligned_buf, block, (uint)aligned_len);
if (read < offset_pad)
return 0;
for (int block_count = aligned_len / 0x10; block_count > 0; --block_count)
{
enc.DecryptBlock (offset, aligned_buf, block);
block += 0x10;
offset += 0x10;
}
if (aligned_buf != buffer)
Buffer.BlockCopy (aligned_buf, offset_pad, buffer, index, length);
return Math.Min (length, read-offset_pad);
}
public static Dictionary<string, LibScheme> KnownSchemes = new Dictionary<string, LibScheme>();
public override ResourceScheme Scheme
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{
get { return new MalieScheme { KnownSchemes = KnownSchemes }; }
set { KnownSchemes = ((MalieScheme)value).KnownSchemes; }
}
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}
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internal class EncryptedStream : Stream
{
ArcView.Frame m_view;
Camellia m_enc;
long m_max_offset;
long m_position = 0;
byte[] m_current_block = new byte[BlockLength];
int m_current_block_length = 0;
long m_current_block_position = 0;
public const int BlockLength = 0x1000;
public Camellia Encryption { get { return m_enc; } }
public EncryptedStream (ArcView mmap, Camellia encryption)
{
m_view = mmap.CreateFrame();
m_enc = encryption;
m_max_offset = mmap.MaxOffset;
}
public override int Read (byte[] buf, int index, int count)
{
int total_read = 0;
bool refill_buffer = !(m_position >= m_current_block_position && m_position < m_current_block_position + m_current_block_length);
while (count > 0 && m_position < m_max_offset)
{
if (refill_buffer)
{
m_current_block_position = m_position & ~((long)BlockLength-1);
FillBuffer();
}
int src_offset = (int)m_position & (BlockLength-1);
int available = Math.Min (count, m_current_block_length - src_offset);
Buffer.BlockCopy (m_current_block, src_offset, buf, index, available);
m_position += available;
total_read += available;
index += available;
count -= available;
refill_buffer = true;
}
return total_read;
}
private void FillBuffer ()
{
m_current_block_length = m_view.Read (m_current_block_position, m_current_block, 0, (uint)BlockLength);
for (int offset = 0; offset < m_current_block_length; offset += 0x10)
{
m_enc.DecryptBlock (m_current_block_position+offset, m_current_block, offset);
}
}
#region IO.Stream methods
public override bool CanRead { get { return !m_disposed; } }
public override bool CanWrite { get { return false; } }
public override bool CanSeek { get { return !m_disposed; } }
public override long Length { get { return m_max_offset; } }
public override long Position
{
get { return m_position; }
set { m_position = value; }
}
public override long Seek (long pos, SeekOrigin whence)
{
if (SeekOrigin.Current == whence)
m_position += pos;
else if (SeekOrigin.End == whence)
m_position = m_max_offset + pos;
else
m_position = pos;
return m_position;
}
public override void Write (byte[] buf, int index, int count)
{
throw new NotSupportedException();
}
public override void SetLength (long length)
{
throw new NotSupportedException();
}
public override void Flush ()
{
}
#endregion
#region IDisposable methods
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
if (disposing)
m_view.Dispose();
m_disposed = true;
base.Dispose();
}
}
#endregion
}
}