GARbro-mirror/ArcFormats/Maika/ArcBK.cs

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2018-01-03 00:24:15 +08:00
//! \file ArcBK.cs
//! \date 2018 Jan 02
//! \brief MAIKA resource archive.
//
// Copyright (C) 2018 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
namespace GameRes.Formats.Maika
{
[Export(typeof(ArchiveFormat))]
public class BkOpener : ArchiveFormat
{
public override string Tag { get { return "DAT/BK"; } }
public override string Description { get { return "Maika resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
uint index_offset = file.View.ReadUInt32 (0);
uint index_size = file.View.ReadUInt32 (4);
if (index_offset+index_size != file.MaxOffset)
return null;
using (var input = file.CreateStream (index_offset, index_size))
using (var packed = new PackedStream<LzBitsDecompressor> (input))
using (var index = new BinaryStream (packed, file.Name))
{
int count = index.ReadInt32();
if (!IsSaneCount (count))
return null;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
uint offset = index.ReadUInt32();
uint size = index.ReadUInt32();
uint unpacked_size = index.ReadUInt32();
var name = index.ReadCString (0x104);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = offset;
entry.Size = size;
entry.UnpackedSize = unpacked_size;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
if (name.HasExtension (".gpt"))
entry.Type = "image";
entry.IsPacked = entry.Size != entry.UnpackedSize;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
var pent = entry as PackedEntry;
if (null == pent || !pent.IsPacked)
return input;
input = new PackedStream<LzBitsDecompressor> (input);
input = new LimitStream (input, pent.UnpackedSize);
if (entry.Name.HasExtension (".gpa"))
input = new XoredStream (input, 0xFF);
return input;
}
}
internal class LzBitsDecompressor : Decompressor
{
MsbBitStream m_input;
public override void Initialize (Stream input)
{
m_input = new MsbBitStream (input, true);
}
protected override IEnumerator<int> Unpack ()
{
var frame = new byte[0x400];
int frame_pos = 1;
for (;;)
{
int bit = m_input.GetNextBit();
if (-1 == bit)
yield break;
if (bit != 0)
{
int v = m_input.GetBits (8);
if (-1 == v)
yield break;
m_buffer[m_pos++] = frame[frame_pos++ & 0x3FF] = (byte)v;
if (0 == --m_length)
yield return m_pos;
}
else
{
int offset = m_input.GetBits (10);
if (-1 == offset)
yield break;
int count = m_input.GetBits (5);
if (-1 == count)
yield break;
count += 2;
while (count-- > 0)
{
byte v = frame[offset++ & 0x3FF];
m_buffer[m_pos++] = frame[frame_pos++ & 0x3FF] = v;
if (0 == --m_length)
yield return m_pos;
}
}
}
}
#region IDisposable Members
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (disposing && !m_disposed)
{
m_input.Dispose();
m_disposed = true;
}
}
#endregion
}
}