GARbro-mirror/ArcFormats/ShiinaRio/ArcWARC1.0.cs
2017-12-09 18:15:06 +04:00

179 lines
6.2 KiB
C#

//! \file ArcWARC1.0.cs
//! \date 2017 Dec 09
//! \brief Forest archive format.
//
// 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.Forest
{
/// <summary>
/// ShiinaRio WARC archives predecessor.
/// </summary>
[Export(typeof(ArchiveFormat))]
public class War0Opener : ArchiveFormat
{
public override string Tag { get { return "WAR/1.0"; } }
public override string Description { get { return "Forest resource archive"; } }
public override uint Signature { get { return 0x43524157; } } // 'WARC'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, " 1.0"))
return null;
uint index_offset = file.View.ReadUInt32 (8);
if (index_offset >= file.MaxOffset)
return null;
var index = file.View.ReadBytes (index_offset, 0xC000);
int count = index.Length / 0x18;
if (!IsSaneCount (count))
return null;
for (int i = 0; i < index.Length; i += 2)
{
index[i ] ^= 0xFE;
index[i+1] ^= 0xE5;
}
int pos = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = Binary.GetCString (index, pos, 0x10);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = index.ToUInt32 (pos+0x10);
entry.Size = index.ToUInt32 (pos+0x14);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.UnpackedSize = entry.Size;
dir.Add (entry);
pos += 0x18;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent)
return base.OpenEntry (arc, entry);
if (!pent.IsPacked)
{
if (!arc.File.View.AsciiEqual (entry.Offset, "Ylz"))
return base.OpenEntry (arc, entry);
pent.IsPacked = true;
pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset+4);
}
var data = arc.File.View.ReadBytes (entry.Offset+8, entry.Size-8);
var reader = new Ylz16Reader (data);
data = reader.Unpack ((int)pent.UnpackedSize);
return new BinMemoryStream (data, entry.Name);
}
}
internal sealed class Ylz16Reader
{
byte[] m_input;
public Ylz16Reader (byte[] input)
{
m_input = input;
DecryptInput();
}
void DecryptInput ()
{
for (int i = 0; i < m_input.Length; ++i)
m_input[i] ^= 0xE6;
}
int GetCtlBit ()
{
int bit = m_ctl & 1;
m_ctl >>= 1;
if (--m_bit_count <= 0)
{
m_ctl = LittleEndian.ToUInt16 (m_input, m_src);
m_src += 2;
m_bit_count = 16;
}
return bit;
}
int m_ctl;
int m_bit_count;
int m_src;
public byte[] Unpack (int unpacked_size)
{
m_src = 0;
m_bit_count = 0;
GetCtlBit();
var output = new byte[unpacked_size];
int dst = 0;
while (dst < unpacked_size)
{
if (GetCtlBit() != 0)
{
output[dst++] = m_input[m_src++];
}
else
{
int offset, count;
if (GetCtlBit() == 0)
{
count = GetCtlBit() << 1;
count |= GetCtlBit();
count += 2;
offset = m_input[m_src++] | -0x100;
}
else
{
byte lo = m_input[m_src++];
byte hi = m_input[m_src++];
offset = lo | (hi & ~7) << 5 | -0x2000;
count = hi & 7;
if (0 == count)
{
count = m_input[m_src++];
if (0 == count)
break;
count += 9;
}
else
{
count += 2;
}
}
Binary.CopyOverlapped (output, dst + offset, dst, count);
dst += count;
}
}
return output;
}
}
}