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//! \file ArcKaguya.cs
//! \date Mon Jun 01 07:03:03 2015
//! \brief KaGuYa archive format.
//
// 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 GameRes.Utility;
namespace GameRes.Formats.Kaguya
{
internal class AriEntry : PackedEntry
{
public ushort Mode;
}
[Export(typeof(ArchiveFormat))]
public class ArcOpener : ArchiveFormat
{
public override string Tag { get { return "ARI"; } }
public override string Description { get { return "KaGuYa script engine resource archive"; } }
public override uint Signature { get { return 0x314c4657; } } // 'WFL1'
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public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
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public ArcOpener ()
{
Extensions = new string[] { "arc" };
}
public override ArcFile TryOpen (ArcView file)
{
var reader = new IndexReader();
var dir = reader.ReadIndex (file);
if (null == dir || 0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var packed_entry = entry as PackedEntry;
if (null == packed_entry || !packed_entry.IsPacked)
return arc.File.CreateStream (entry.Offset, entry.Size);
if (0 == packed_entry.UnpackedSize)
packed_entry.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset-4);
using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
using (var reader = new LzReader (input, entry.Size, packed_entry.UnpackedSize))
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{
reader.Unpack();
return new MemoryStream (reader.Data);
}
}
}
internal class IndexReader
{
byte[] m_name_buf = new byte[0x20];
List<Entry> m_dir = new List<Entry>();
public List<Entry> ReadIndex (ArcView file)
{
string ari_name = Path.ChangeExtension (file.Name, "ari");
List<Entry> dir = null;
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if (file.Name != ari_name && VFS.FileExists (ari_name))
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dir = ReadAriIndex (file, ari_name);
if (null == dir || 0 == dir.Count)
dir = BuildIndex (file);
return dir;
}
List<Entry> ReadAriIndex (ArcView file, string ari_name)
{
long arc_offset = 4;
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using (var ari = VFS.OpenView (ari_name))
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{
long index_offset = 0;
while (index_offset+4 < ari.MaxOffset)
{
int name_len = ari.View.ReadInt32 (index_offset);
var name = ReadName (ari, index_offset+4, name_len);
if (null == name)
return null;
var entry = new AriEntry { Name = name };
index_offset += name_len + 4;
entry.Mode = ari.View.ReadUInt16 (index_offset);
entry.Size = ari.View.ReadUInt32 (index_offset+2);
entry.UnpackedSize = 0;
SetType (entry);
index_offset += 6;
arc_offset += name_len + 10;
if (1 == entry.Mode)
{
entry.IsPacked = true;
arc_offset += 4;
}
entry.Offset = arc_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
arc_offset += entry.Size;
m_dir.Add (entry);
}
}
return m_dir;
}
List<Entry> BuildIndex (ArcView file)
{
long arc_offset = 4;
while (arc_offset+4 < file.MaxOffset)
{
int name_len = file.View.ReadInt32 (arc_offset);
var name = ReadName (file, arc_offset+4, name_len);
if (null == name)
return null;
var entry = new AriEntry { Name = name };
arc_offset += name_len + 4;
entry.Mode = file.View.ReadUInt16 (arc_offset);
entry.Size = file.View.ReadUInt32 (arc_offset+2);
SetType (entry);
arc_offset += 6;
if (1 == entry.Mode)
{
entry.IsPacked = true;
entry.UnpackedSize = file.View.ReadUInt32 (arc_offset);
arc_offset += 4;
}
entry.Offset = arc_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
arc_offset += entry.Size;
m_dir.Add (entry);
}
return m_dir;
}
void SetType (AriEntry entry)
{
if (2 == entry.Mode)
entry.Type = "audio";
else if (1 == entry.Mode)
entry.Type = "image";
else
entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
}
string ReadName (ArcView file, long offset, int name_len)
{
if (name_len <= 0 || offset+name_len+6 > file.MaxOffset || name_len > 0x100)
return null;
if (name_len > m_name_buf.Length)
m_name_buf = new byte[name_len];
file.View.Read (offset, m_name_buf, 0, (uint)name_len);
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return DecryptName (m_name_buf, name_len).TrimStart ('\\');
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}
string DecryptName (byte[] name_buf, int name_len)
{
for (int i = 0; i < name_len; ++i)
name_buf[i] ^= 0xff;
return Encodings.cp932.GetString (name_buf, 0, name_len);
}
}
internal sealed class LzReader : IDisposable, IDataUnpacker
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{
MsbBitStream m_input;
byte[] m_output;
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public byte[] Data { get { return m_output; } }
public LzReader (Stream input, uint packed_size, uint unpacked_size)
{
m_input = new MsbBitStream (input, true);
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m_output = new byte[unpacked_size];
}
public void Unpack ()
{
int dst = 0;
int frame_pos = 1;
byte[] frame = new byte[4096];
int frame_mask = frame.Length - 1;
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while (dst < m_output.Length)
{
int bit = m_input.GetNextBit();
if (-1 == bit)
break;
if (0 != bit)
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{
int data = m_input.GetBits (8);
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m_output[dst++] = (byte)data;
frame[frame_pos++] = (byte)data;
frame_pos &= frame_mask;
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}
else
{
int win_offset = m_input.GetBits (12);
if (-1 == win_offset || 0 == win_offset)
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break;
int count = m_input.GetBits(4) + 2;
for (int i = 0; i < count; i++)
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{
byte data = frame[(win_offset + i) & frame_mask];
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m_output[dst++] = data;
frame[frame_pos++] = data;
frame_pos &= frame_mask;
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}
}
}
}
#region IDisposable Members
bool _disposed = false;
public void Dispose ()
{
if (!_disposed)
{
m_input.Dispose();
_disposed = true;
}
}
#endregion
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}
}