GARbro-mirror/ArcFormats/Stack/ArcGPK.cs
2018-11-01 23:54:07 +04:00

142 lines
5.7 KiB
C#

//! \file ArcGPK.cs
//! \date 2018 Nov 01
//! \brief Stack script engine resource archive.
//
// Copyright (C) 2018 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 System.Linq;
using System.Text;
using GameRes.Compression;
namespace GameRes.Formats.Stack
{
internal class GpkEntry : PackedEntry
{
public byte[] Header;
}
[Export(typeof(ArchiveFormat))]
public class GpkOpener : ArchiveFormat
{
public override string Tag { get { return "GPK/STACK"; } }
public override string Description { get { return "Stack script engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
long idx_offset = file.MaxOffset - 32;
if (idx_offset <= 0)
return null;
if (!file.View.AsciiEqual (idx_offset, "STKFile0PIDX") ||
!file.View.AsciiEqual (idx_offset+16, "STKFile0PACKFILE"))
return null;
uint idx_size = file.View.ReadUInt32 (idx_offset+12);
if (idx_size > idx_offset)
return null;
idx_offset -= idx_size;
var key = QueryKey (file.Name);
if (null == key)
return null;
Stream input = file.CreateStream (idx_offset, idx_size);
input = new ByteStringEncryptedStream (input, key);
input.Position = 4;
using (input = new ZLibStream (input, CompressionMode.Decompress))
using (var index = new BinaryStream (input, file.Name))
{
var name_buffer = new byte[0x100];
var dir = new List<Entry>();
while (index.PeekByte() != -1)
{
int name_length = index.ReadUInt16() * 2;
if (0 == name_length)
break;
if (name_length > name_buffer.Length)
name_buffer = new byte[name_length];
index.Read (name_buffer, 0, name_length);
var name = Encoding.Unicode.GetString (name_buffer, 0, name_length);
var entry = Create<GpkEntry> (name);
index.ReadInt32();
index.ReadInt16();
entry.Offset = index.ReadUInt32();
entry.Size = index.ReadUInt32();
if (!entry.CheckPlacement (file.MaxOffset))
return null;
index.ReadInt32();
entry.UnpackedSize = index.ReadUInt32();
entry.IsPacked = entry.UnpackedSize != 0;
int header_length = index.ReadUInt8();
if (header_length > 0)
entry.Header = index.ReadBytes (header_length);
dir.Add (entry);
}
if (0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var gent = (GpkEntry)entry;
Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
if (gent.Header != null)
input = new PrefixStream (gent.Header, input);
if (gent.IsPacked)
input = new ZLibStream (input, CompressionMode.Decompress);
return input;
}
byte[] QueryKey (string arc_name)
{
if (VFS.IsVirtual)
return null;
var dir = VFS.GetDirectoryName (arc_name);
var parent_dir = Directory.GetParent (dir).FullName;
var exe_files = VFS.GetFiles (VFS.CombinePath (parent_dir, "*.exe")).Concat (VFS.GetFiles (VFS.CombinePath (dir, "*.exe")));
foreach (var exe_entry in exe_files)
{
try
{
using (var exe = new ExeFile.ResourceAccessor (exe_entry.Name))
{
var code = exe.GetResource ("CIPHERCODE", "CODE");
if (null == code)
continue;
if (20 == code.Length)
code = new CowArray<byte> (code, 4, 16).ToArray();
return code;
}
}
catch { /* ignore errors */ }
}
return null;
}
}
}