GARbro-mirror/ArcFormats/ArcPACKDAT.cs

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//! \file ArcInnGrey.cs
//! \date Mon Jan 19 08:57:16 2015
//! \brief Innocent Grey archives format.
//
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// Copyright (C) 2015-2016 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.IO;
using System.Collections.Generic;
using System.ComponentModel.Composition;
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using GameRes.Utility;
namespace GameRes.Formats.SystemEpsylon
{
internal class PackDatEntry : PackedEntry
{
public uint Flags;
}
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "PACKDAT"; } }
public override string Description { get { return "SYSTEM-ε resource archive"; } }
public override uint Signature { get { return 0x4B434150; } } // "PACK"
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public PakOpener ()
{
Extensions = new string[] { "pak", "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "DAT."))
return null;
int count = file.View.ReadInt32 (8);
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if (!IsSaneCount (count))
return null;
uint index_size = 0x30 * (uint)count;
if (index_size > file.View.Reserve (0x10, index_size))
return null;
var dir = new List<Entry> (count);
long index_offset = 0x10;
for (int i = 0; i < count; ++i)
{
string name = file.View.ReadString (index_offset, 0x20);
var entry = FormatCatalog.Instance.Create<PackDatEntry> (name);
entry.Offset = file.View.ReadUInt32 (index_offset+0x20);
entry.Flags = file.View.ReadUInt32 (index_offset+0x24);
entry.Size = file.View.ReadUInt32 (index_offset+0x28);
entry.UnpackedSize = file.View.ReadUInt32 (index_offset+0x2c);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x30;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pentry = entry as PackDatEntry;
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if (null == pentry || entry.Size < 4 || 0 == (pentry.Flags & 0x10000))
return arc.File.CreateStream (entry.Offset, entry.Size);
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var input = arc.File.View.ReadBytes (entry.Offset, pentry.Size);
if (input.Length == pentry.Size)
{
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unsafe
{
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fixed (byte* buf_raw = input)
{
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uint* encoded = (uint*)buf_raw;
uint key = pentry.Size >> 2;
key = (key << (((int)key & 7) + 8)) ^ key;
for (uint i = entry.Size / 4; i != 0; --i )
{
*encoded ^= key;
int cl = (int)(*encoded++ % 24);
key = Binary.RotL (key, cl);
}
}
}
}
return new MemoryStream (input);
}
}
}