GARbro-mirror/ArcFormats/Ail/ArcAil.cs
2018-01-04 20:43:30 +04:00

207 lines
7.3 KiB
C#

//! \file ArcAil.cs
//! \date Mon Apr 20 21:21:49 2015
//! \brief Ail 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.Ail
{
[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
public override string Tag { get { return "DAT/Ail"; } }
public override string Description { get { return "Ail resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public DatOpener ()
{
Extensions = new string[] { "dat", "snl" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0);
if (!IsSaneCount (count))
return null;
var dir = ReadIndex (file, 4, count);
if (null == dir)
return null;
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var pentry = entry as PackedEntry;
if (null == pentry || !pentry.IsPacked)
return input;
using (input)
{
byte[] data = new byte[pentry.UnpackedSize];
LzssUnpack (input, data);
return new BinMemoryStream (data, entry.Name);
}
}
internal List<Entry> ReadIndex (ArcView file, uint index_offset, int count)
{
var base_name = Path.GetFileNameWithoutExtension (file.Name);
long offset = index_offset + count*4;
if (offset >= file.MaxOffset)
return null;
var dir = new List<Entry> (count/2);
for (int i = 0; i < count; ++i)
{
uint size = file.View.ReadUInt32 (index_offset);
if (size != 0 && size != uint.MaxValue)
{
var entry = new PackedEntry
{
Name = string.Format ("{0}#{1:D5}", base_name, i),
Offset = offset,
Size = size,
IsPacked = false,
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
offset += size;
}
index_offset += 4;
}
if (0 == dir.Count)
return null;
DetectFileTypes (file, dir);
return dir;
}
internal void DetectFileTypes (ArcView file, List<Entry> dir)
{
byte[] preview = new byte[16];
byte[] sign_buf = new byte[4];
foreach (PackedEntry entry in dir)
{
uint extra = 6;
if (extra > entry.Size)
continue;
uint signature = file.View.ReadUInt32 (entry.Offset);
if (1 == (signature & 0xFFFF))
{
entry.IsPacked = true;
entry.UnpackedSize = file.View.ReadUInt32 (entry.Offset+2);
}
else if (0 == signature)
{
extra = 4;
}
entry.Offset += extra;
entry.Size -= extra;
if (entry.IsPacked)
{
file.View.Read (entry.Offset, preview, 0, (uint)preview.Length);
using (var input = new MemoryStream (preview))
{
LzssUnpack (input, sign_buf);
signature = LittleEndian.ToUInt32 (sign_buf, 0);
}
}
else
{
signature = file.View.ReadUInt32 (entry.Offset);
}
if (0 != signature)
SetEntryType (entry, signature);
}
}
static void SetEntryType (Entry entry, uint signature)
{
var res = AutoEntry.DetectFileType (signature);
if (null != res)
entry.ChangeType (res);
}
/// <summary>
/// Custom LZSS decompression with frame pre-initialization and reveresed control bits meaning.
/// </summary>
static void LzssUnpack (Stream input, byte[] output)
{
int frame_pos = 0xfee;
byte[] frame = new byte[0x1000];
for (int i = 0; i < frame_pos; ++i)
frame[i] = 0x20;
int dst = 0;
int ctl = 0;
while (dst < output.Length)
{
ctl >>= 1;
if (0 == (ctl & 0x100))
{
ctl = input.ReadByte();
if (-1 == ctl)
break;
ctl |= 0xff00;
}
if (0 == (ctl & 1))
{
int v = input.ReadByte();
if (-1 == v)
break;
output[dst++] = (byte)v;
frame[frame_pos++] = (byte)v;
frame_pos &= 0xfff;
}
else
{
int offset = input.ReadByte();
if (-1 == offset)
break;
int count = input.ReadByte();
if (-1 == count)
break;
offset |= (count & 0xf0) << 4;
count = (count & 0x0f) + 3;
for (int i = 0; i < count; i++)
{
if (dst >= output.Length)
break;
byte v = frame[offset++];
offset &= 0xfff;
frame[frame_pos++] = v;
frame_pos &= 0xfff;
output[dst++] = v;
}
}
}
}
}
}