GARbro-mirror/ArcFormats/CaramelBox/ArcARC4.cs
morkt f1d66206bc (IResource.CanWrite): new property.
(ArchiveFormat.CanCreate): renamed to CanWrite.
2016-10-11 00:05:22 +04:00

369 lines
13 KiB
C#

//! \file ArcARC4.cs
//! \date Wed Aug 10 15:50:21 2016
//! \brief Caramel BOX resource archive.
//
// Copyright (C) 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;
using GameRes.Utility;
namespace GameRes.Formats.CaramelBox
{
internal class Arc4Entry : PackedEntry
{
public List<long> Segments;
}
[Export(typeof(ArchiveFormat))]
public class Arc4Opener : ArchiveFormat
{
public override string Tag { get { return "ARC4"; } }
public override string Description { get { return "Caramel BOX resource archive"; } }
public override uint Signature { get { return 0x34435241; } } // 'ARC4'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public Arc4Opener ()
{
Extensions = new string[] { "bin", "dat", "データ" };
}
public override ArcFile TryOpen (ArcView file)
{
if (0x010000 != file.View.ReadUInt32 (4))
return null;
int count = file.View.ReadInt32 (0x10);
if (!IsSaneCount (count))
return null;
uint index_length = file.View.ReadUInt32 (8);
uint alignment = file.View.ReadUInt32 (0xC);
int index_offset = file.View.ReadInt32 (0x14);
int names_offset = file.View.ReadInt32 (0x1C) - index_offset;
int segment_table = file.View.ReadInt32 (0x24) - index_offset;
uint base_offset = file.View.ReadUInt32 (0x2C);
if (0 == alignment || index_offset <= 0 || names_offset <= 0 || segment_table <= 0)
return null;
if (!file.View.AsciiEqual (index_offset, "tZ"))
return null;
byte[] index;
using (var packed = file.CreateStream (index_offset, index_length))
using (var tz = new TzCompression (packed))
index = tz.Unpack();
int current_offset = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
int name_pos = ReadInt24 (index, current_offset) * 2;
int name_length = index[current_offset+3];
int chunk_count = index[current_offset+4];
int offset = ReadInt24 (index, current_offset+5);
var name = Binary.GetCString (index, names_offset + name_pos, name_length);
var entry = FormatCatalog.Instance.Create<Arc4Entry> (name);
entry.Segments = new List<long> (chunk_count);
if (chunk_count > 1)
{
int segment_pos = segment_table + 3 * offset;
for (int j = 0; j < chunk_count; ++j)
{
entry.Segments.Add (ReadInt24 (index, segment_pos) + base_offset);
segment_pos += 3;
}
}
else
entry.Segments.Add (offset + base_offset);
for (int j = 0; j < chunk_count; ++j)
entry.Segments[j] *= alignment;
dir.Add (entry);
current_offset += 8;
}
foreach (Arc4Entry entry in dir)
{
uint size = 0;
foreach (var segment in entry.Segments)
{
size += Binary.BigEndian (file.View.ReadUInt32 (segment+4));
}
entry.Offset = entry.Segments[0] + 0x10;
entry.Size = size;
entry.IsPacked = file.View.AsciiEqual (entry.Offset, "tZ");
if (entry.IsPacked)
entry.UnpackedSize = file.View.ReadUInt32 (entry.Offset+2);
else
entry.UnpackedSize = size;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var xent = (Arc4Entry)entry;
Stream input;
if (1 == xent.Segments.Count)
input = arc.File.CreateStream (entry.Offset, entry.Size);
else
input = new Arc4Stream (arc.File, xent);
if (!xent.IsPacked)
return input;
using (input)
using (var tz = new TzCompression (input))
return new MemoryStream (tz.Unpack());
}
static int ReadInt24 (byte[] data, int pos)
{
return data[pos] << 16 | data[pos+1] << 8 | data[pos+2];
}
}
internal sealed class TzCompression : IDisposable
{
BinaryReader m_input;
public TzCompression (Stream stream)
{
m_input = new ArcView.Reader (stream);
}
public byte[] Unpack ()
{
int signature = m_input.ReadUInt16();
uint unpacked_size = m_input.ReadUInt32();
var data = new byte[unpacked_size];
int dst = 0;
var buffer = new byte[0x10000];
while (dst < data.Length)
{
signature = m_input.ReadUInt16();
ushort block_size = m_input.ReadUInt16();
ushort unpacked_block_size = m_input.ReadUInt16();
if (0 == unpacked_block_size)
throw new InvalidFormatException();
ushort key = m_input.ReadUInt16();
if (block_size != m_input.Read (buffer, 0, block_size))
throw new EndOfStreamException();
DecryptBlock (buffer, 0, block_size, key);
if (0x7453 == signature) // 'St'
Buffer.BlockCopy (buffer, 0, data, dst, unpacked_block_size);
else if (0x745A == signature) // 'Zt'
UnpackBlock (buffer, 0, block_size, data, dst, unpacked_block_size);
else
throw new InvalidFormatException();
dst += unpacked_block_size;
}
return data;
}
unsafe void DecryptBlock (byte[] data, int pos, int count, uint key)
{
fixed (byte* data8 = &data[pos])
{
ushort* data16 = (ushort*)data8;
for (int i = count / 2; i > 0; --i)
{
key *= 0x1465D9;
key += 0x0FB5;
*data16++ -= (ushort)(key >> 16);
}
}
}
void UnpackBlock (byte[] input, int src, int input_size,
byte[] output, int dst, int output_size)
{
int src_end = src + input_size;
while (src < src_end)
{
int ctl = input[src++];
if (0 == ctl)
break;
if (0 != (ctl & 0x80))
{
int offset, count;
if (0 != (ctl & 0x40))
{
if (0 != (ctl & 0x20))
{
ctl = (ctl << 8) | input[src++];
ctl = (ctl << 8) | input[src++];
count = (ctl & 0x3F) + 4;
offset = (ctl >> 6) & 0x7FFF;
}
else
{
ctl = (ctl << 8) | input[src++];
count = (ctl & 7) + 3;
offset = (ctl >> 3) & 0x3FF;
}
}
else
{
count = (ctl & 3) + 2;
offset = (ctl >> 2) & 0xF;
}
++offset;
Binary.CopyOverlapped (output, dst - offset, dst, count);
dst += count;
}
else
{
Buffer.BlockCopy (input, src, output, dst, ctl);
src += ctl;
dst += ctl;
}
}
}
#region IDisposable Members
bool _disposed = false;
public void Dispose ()
{
if (!_disposed)
{
m_input.Dispose();
_disposed = true;
}
}
#endregion
}
internal class Arc4Stream : Stream
{
ArcView m_file;
IEnumerator<long> m_segment;
Stream m_stream;
bool m_eof = false;
public override bool CanRead { get { return !_disposed; } }
public override bool CanSeek { get { return false; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { throw new NotSupportedException ("Arc4Stream.Length not supported"); } }
public override long Position
{
get { throw new NotSupportedException ("Arc4Stream.Position not supported."); }
set { throw new NotSupportedException ("Arc4Stream.Position not supported."); }
}
public Arc4Stream (ArcView file, Arc4Entry entry)
{
m_file = file;
m_segment = entry.Segments.GetEnumerator();
NextSegment();
}
private void NextSegment ()
{
if (!m_segment.MoveNext())
{
m_eof = true;
return;
}
var prev_stream = m_stream;
long offset = m_segment.Current;
var segment_size = Binary.BigEndian (m_file.View.ReadUInt32 (offset+4));
m_stream = m_file.CreateStream (offset+0x10, segment_size);
if (null != prev_stream)
prev_stream.Dispose();
}
public override int Read (byte[] buffer, int offset, int count)
{
int total = 0;
while (!m_eof && count > 0)
{
int read = m_stream.Read (buffer, offset, count);
if (0 != read)
{
total += read;
offset += read;
count -= read;
}
if (0 != count)
NextSegment();
}
return total;
}
public override int ReadByte ()
{
int b = -1;
while (!m_eof)
{
b = m_stream.ReadByte();
if (-1 != b)
break;
NextSegment();
}
return b;
}
public override void Flush ()
{
}
public override long Seek (long offset, SeekOrigin origin)
{
throw new NotSupportedException ("Arc4Stream.Seek method is not supported");
}
public override void SetLength (long length)
{
throw new NotSupportedException ("Arc4Stream.SetLength method is not supported");
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ("Arc4Stream.Write method is not supported");
}
public override void WriteByte (byte value)
{
throw new NotSupportedException("Arc4Stream.WriteByte method is not supported");
}
#region IDisposable Members
bool _disposed = false;
protected override void Dispose (bool disposing)
{
if (!_disposed)
{
if (disposing)
{
if (null != m_stream)
m_stream.Dispose();
m_segment.Dispose();
}
_disposed = true;
base.Dispose (disposing);
}
}
#endregion
}
}