GARbro-mirror/ArcFormats/uGOS/ArcDET.cs

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2015-11-09 08:14:37 +08:00
//! \file ArcDET.cs
//! \date Mon Nov 09 00:16:53 2015
//! \brief μ-GameOperationSystem resource archive.
//
// 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.uGOS
{
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "DET"; } }
public override string Description { get { return "μ-GameOperationSystem resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.Name.EndsWith (".det", StringComparison.InvariantCultureIgnoreCase))
return null;
var name_file = Path.ChangeExtension (file.Name, "nme");
var index_file = Path.ChangeExtension (file.Name, "atm");
if (!VFS.FileExists (name_file) || !VFS.FileExists (index_file))
return null;
using (var nme = VFS.OpenView (name_file))
using (var idx = VFS.OpenView (index_file))
{
var name_table = new byte[nme.MaxOffset];
nme.View.Read (0, name_table, 0, (uint)name_table.Length);
uint idx_offset = 0;
int count = (int)(idx.MaxOffset / 0x14);
if (!IsSaneCount (count))
return null;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
int name_offset = idx.View.ReadInt32 (idx_offset);
if (name_offset < 0 || name_offset >= name_table.Length)
return null;
var name = Binary.GetCString (name_table, name_offset, name_table.Length - name_offset);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = idx.View.ReadUInt32 (idx_offset + 4);
entry.Size = idx.View.ReadUInt32 (idx_offset + 8);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.UnpackedSize = idx.View.ReadUInt32 (idx_offset + 0x10);
entry.IsPacked = true;
dir.Add (entry);
idx_offset += 0x14;
}
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent || !pent.IsPacked)
return base.OpenEntry (arc, entry);
var output = new byte[pent.UnpackedSize];
using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
{
if (Unpack (input, output))
return new MemoryStream (output);
else
return base.OpenEntry (arc, entry);
}
}
bool Unpack (Stream input, byte[] output)
{
int dst = 0;
while (dst < output.Length)
{
int ctl = input.ReadByte();
if (-1 == ctl)
return false;
if (0xFF != ctl)
{
output[dst++] = (byte)ctl;
}
else
{
ctl = input.ReadByte();
if (-1 == ctl)
return false;
if (0xFF == ctl)
{
output[dst++] = 0xFF;
}
else
{
int offset = (ctl >> 2) + 1;
int count = (ctl & 3) + 3;
Binary.CopyOverlapped (output, dst-offset, dst, count);
dst += count;
}
}
}
return true;
}
}
}