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//! \file ArcPAK.cs
//! \date 2017 Dec 15
//! \brief Cocktail Soft resource archive.
//
// Copyright (C) 2017 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;
namespace GameRes.Formats.Cocktail
{
internal class CompressedEntry : PackedEntry
{
public int Compression;
}
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "PAK/COCKTAIL"; } }
public override string Description { get { return "Cocktail Soft resource archive"; } }
public override uint Signature { get { return 0x4B434150; } } // 'PACK'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
uint record_size = file.View.ReadUInt32 (8);
if (record_size <= 0x10 || record_size > 0x100)
return null;
uint index_offset = 0xC;
uint data_offset = index_offset + (uint)count * record_size;
if (data_offset >= file.MaxOffset
|| data_offset > file.View.Reserve (0, data_offset))
return null;
uint name_size = record_size - 0x10;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset+0x10, name_size);
if (string.IsNullOrEmpty (name))
return null;
var entry = FormatCatalog.Instance.Create<CompressedEntry> (name);
entry.UnpackedSize = file.View.ReadUInt32 (index_offset);
entry.Size = file.View.ReadUInt32 (index_offset+4);
entry.Compression = file.View.ReadInt32 (index_offset+8);
entry.Offset = file.View.ReadUInt32 (index_offset+0xC) + data_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = entry.Compression != 0;
index_offset += record_size;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as CompressedEntry;
if (null == pent || pent.Compression != 2)
return base.OpenEntry (arc, entry);
using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
using (var unpacker = new LzCompression (input, (int)pent.UnpackedSize))
{
var data = unpacker.Unpack();
return new BinMemoryStream (data, entry.Name);
}
}
}
internal sealed class LzCompression : IDisposable
{
MsbBitStream m_input;
byte[] m_output;
byte[] m_frame;
public LzCompression (IBinaryStream input, int unpacked_size)
{
m_input = new MsbBitStream (input.AsStream);
m_output = new byte[unpacked_size];
m_frame = new byte[0x1000];
}
public byte[] Unpack ()
{
int dst = 0;
int frame_pos = 1;
while (dst < m_output.Length)
{
int bit = m_input.GetNextBit();
if (bit != 0)
{
if (-1 == bit)
break;
int v = m_input.GetBits (8);
if (-1 == v)
break;
m_frame[frame_pos++ & 0xFFF] = m_output[dst++] = (byte)v;
}
else
{
int offset = m_input.GetBits (12);
if (-1 == offset)
break;
int count = m_input.GetBits (4);
if (-1 == count)
break;
count += 2;
while (count --> 0)
{
byte v = m_frame[offset++ & 0xFFF];
m_output[dst++] = v;
m_frame[frame_pos++ & 0xFFF] = v;
}
}
}
return m_output;
}
bool m_disposed = false;
public void Dispose ()
{
if (!m_disposed)
{
m_input.Dispose();
m_disposed = true;
}
}
}
}