GARbro-mirror/ArcFormats/GsPack/ArcGsPack.cs

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//! \file ArcGsPack.cs
//! \date Thu Apr 16 14:55:01 2015
//! \brief GsPack resource archives implementation.
//
// 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 System.Linq;
using GameRes.Compression;
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using GameRes.Utility;
namespace GameRes.Formats.Gs
{
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internal class GsPackArchive : ArcFile
{
public GsPackArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir)
: base (arc, impl, dir)
{
}
}
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[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "GsPack"; } }
public override string Description { get { return "GsPack resource archive"; } }
public override uint Signature { get { return 0x61746144; } } // 'Data'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public PakOpener ()
{
Extensions = new string[] { "pak", "dat", "pa_" };
Signatures = new uint[] { 0x61746144, 0x61507347 };
}
public override ArcFile TryOpen (ArcView file)
{
if (!(file.View.AsciiEqual (0, "DataPack5") ||
file.View.AsciiEqual (0, "GsPack5") ||
file.View.AsciiEqual (0, "GsPack4")))
return null;
int version_minor = file.View.ReadUInt16 (0x30);
int version_major = file.View.ReadUInt16 (0x32);
uint index_size = file.View.ReadUInt32 (0x34);
int count = file.View.ReadInt32 (0x3c);
if (!IsSaneCount (count) || index_size > 0xffffff)
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return null;
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uint is_encrypted = file.View.ReadUInt32 (0x38);
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long data_offset = file.View.ReadUInt32 (0x40);
int index_offset = file.View.ReadInt32 (0x44);
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int entry_size = version_major < 5 ? 0x48 : 0x68;
int unpacked_size = count * entry_size;
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byte[] index;
if (index_size != 0)
{
byte[] packed_index = file.View.ReadBytes (index_offset, index_size);
if (index_size != packed_index.Length)
return null;
if (0 != (is_encrypted & 1))
for (int i = 0; i != packed_index.Length; ++i)
packed_index[i] ^= (byte)i;
using (var stream = new MemoryStream (packed_index))
using (var reader = new LzssReader (stream, packed_index.Length, unpacked_size))
{
reader.Unpack();
index = reader.Data;
}
}
else
{
index = file.View.ReadBytes (index_offset, (uint)unpacked_size);
}
index_offset = 0;
string default_type = "";
var arc_name = Path.GetFileNameWithoutExtension (file.Name);
if (arc_name.StartsWith ("image", StringComparison.OrdinalIgnoreCase))
default_type = "image";
else if (arc_name.StartsWith ("voice", StringComparison.OrdinalIgnoreCase))
default_type = "audio";
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
string name = Binary.GetCString (index, index_offset, 0x40);
if (0 != name.Length)
{
var entry = new Entry {
Name = name,
Type = default_type,
Offset = data_offset + LittleEndian.ToUInt32 (index, index_offset+0x40),
Size = LittleEndian.ToUInt32 (index, index_offset+0x44),
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
index_offset += entry_size;
}
if (0 != (is_encrypted & 2))
return new GsPackArchive (file, this, dir);
if (string.IsNullOrEmpty (default_type))
{
foreach (var entry in dir)
{
uint signature = file.View.ReadUInt32 (entry.Offset);
var res = AutoEntry.DetectFileType (signature);
entry.ChangeType (res);
}
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var garc = arc as GsPackArchive;
if (null == garc)
return base.OpenEntry (arc, entry);
var data = garc.File.View.ReadBytes (entry.Offset, entry.Size);
DecryptData (data, entry.Name);
return new BinMemoryStream (data, entry.Name);
}
void DecryptData (byte[] data, string key)
{
int numkey = 0;
for (int i = 0; i < key.Length; ++i)
numkey = numkey * 37 + (key[i] | 0x20);
unsafe
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{
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fixed (byte* data8 = data)
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{
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int* data32 = (int*)data8;
for (int count = data.Length / 4; count > 0; --count)
*data32++ ^= numkey;
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}
}
}
}
[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
public override string Tag { get { return "GsData"; } }
public override string Description { get { return "GsPack resource archive"; } }
public override uint Signature { get { return 0x59537347; } } // 'GsSY'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public DatOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (0, "GsSYMBOL5BINDATA"))
return null;
uint header_size = file.View.ReadUInt32 (0xa4);
if (header_size < 0xd0)
return null;
int count = file.View.ReadInt32 (0xa8);
uint index_offset = file.View.ReadUInt32 (0xb8);
uint index_size = file.View.ReadUInt32 (0xbc);
uint crypt_key = file.View.ReadUInt32 (0xc0);
uint unpacked_index_size = file.View.ReadUInt32 (0xc4);
if (count * 0x18 != unpacked_index_size)
return null;
uint data_offset = file.View.ReadUInt32 (0xc8);
byte[] packed_index = new byte[index_size];
if (index_size != file.View.Read (index_offset, packed_index, 0, index_size))
return null;
if (0 != crypt_key)
for (int i = 0; i != packed_index.Length; ++i)
packed_index[i] ^= (byte)(i & crypt_key);
using (var stream = new MemoryStream (packed_index))
using (var reader = new LzssReader (stream, packed_index.Length, (int)unpacked_index_size))
{
reader.Unpack();
var index = reader.Data;
index_offset = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var entry = new PackedEntry
{
Name = i.ToString ("D5"),
Offset = data_offset + LittleEndian.ToUInt32 (index, (int)index_offset),
Size = LittleEndian.ToUInt32 (index, (int)index_offset + 4),
UnpackedSize = LittleEndian.ToUInt32 (index, (int)index_offset + 8),
};
dir.Add (entry);
index_offset += 0x18;
}
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (0 == entry.Size)
return Stream.Null;
var input = arc.File.CreateStream (entry.Offset, entry.Size);
if (entry is PackedEntry)
return new LzssStream (input);
return input;
}
}
[Export(typeof(ScriptFormat))]
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public class GsScriptFormat : GenericScriptFormat
{
public override string Tag { get { return "SCW"; } }
public override string Description { get { return "GsWin script file"; } }
public override uint Signature { get { return 0x20574353; } } // 'SCW '
public GsScriptFormat ()
{
Signatures = new uint[] { 0x20574353, 0x35776353, 0x34776353 };
}
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}
}