GARbro-mirror/ArcFormats/ArcSPack.cs

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//! \file ArcSPack.cs
//! \date Fri May 22 04:54:08 2015
//! \brief 'SPack' resource archives.
//
// Copyright (C) 2015 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.Security.Cryptography;
using GameRes.Utility;
namespace GameRes.Formats.SPack
{
internal class SPackEntry : PackedEntry
{
public byte Method;
public ushort Crc;
}
[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
public override string Tag { get { return "SPACK"; } }
public override string Description { get { return "SPack resource archive"; } }
public override uint Signature { get { return 0x63615053; } } // 'SPac'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public DatOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
if ('k' != file.View.ReadInt16 (4))
return null;
int version = file.View.ReadInt16 (6);
if (1 != version)
return null;
uint data_size = file.View.ReadUInt32 (8);
int count = file.View.ReadInt32 (0x10);
if (count <= 0 || count > 0xfffff)
return null;
uint index_size = (uint)(0x38 * count);
long base_offset = 0x18;
long index_offset = base_offset + data_size;
if (index_offset >= file.MaxOffset || index_size > file.View.Reserve (index_offset, index_size))
return null;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset, 0x20);
index_offset += 0x20;
var entry = new SPackEntry
{
Name = name,
Offset = base_offset + file.View.ReadUInt32 (index_offset),
UnpackedSize = file.View.ReadUInt32 (index_offset+4),
Size = file.View.ReadUInt32 (index_offset+8),
Method = file.View.ReadByte (index_offset+12),
Crc = file.View.ReadUInt16 (index_offset+14),
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
if (name.HasExtension (".dat"))
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entry.Type = "audio";
else
entry.Type = FormatCatalog.Instance.GetTypeFromName (name);
entry.IsPacked = entry.Method != 0;
dir.Add (entry);
index_offset += 0x18;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var packed_entry = entry as SPackEntry;
if (null == packed_entry || !packed_entry.IsPacked)
return input;
if (1 == packed_entry.Method)
return new InputCryptoStream (input, new NotTransform());
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if (2 == packed_entry.Method)
{
using (var reader = new PackedReader (packed_entry, input))
{
reader.Unpack();
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return new BinMemoryStream (reader.Data, entry.Name);
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}
}
return input;
}
}
internal sealed class PackedReader : IDisposable
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{
IBinaryStream m_input;
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uint m_packed_size;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public PackedReader (SPackEntry entry, IBinaryStream input)
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{
m_input = input;
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m_packed_size = entry.Size;
m_output = new byte[entry.UnpackedSize];
}
public byte[] Unpack ()
{
int dst = 0;
uint src = 0;
uint ctl = 0;
uint mask = 0;
while (dst < m_output.Length && src < m_packed_size)
{
if (0 == mask)
{
ctl = m_input.ReadUInt32();
src += 4;
mask = 0x80000000;
}
if (0 != (ctl & mask))
{
int copy_count, offset;
offset = m_input.ReadUInt8();
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src++;
copy_count = offset >> 4;
offset &= 0x0f;
if (15 == copy_count)
{
copy_count = m_input.ReadUInt16();
src += 2;
}
else if (14 == copy_count)
{
copy_count = m_input.ReadUInt8();
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src++;
}
else
copy_count++;
if (offset < 10)
offset++;
else
{
offset = ((offset - 10) << 8) | m_input.ReadUInt8();
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src++;
}
if (dst + copy_count > m_output.Length)
copy_count = m_output.Length - dst;
Binary.CopyOverlapped (m_output, dst-offset, dst, copy_count);
dst += copy_count;
}
else
{
m_output[dst++] = m_input.ReadUInt8();
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src++;
}
mask >>= 1;
}
return m_output;
}
#region IDisposable Members
bool disposed = false;
public void Dispose ()
{
if (!disposed)
{
m_input.Dispose();
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disposed = true;
}
GC.SuppressFinalize (this);
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}
#endregion
}
}