GARbro-mirror/ArcFormats/MangaGamer/ArcMGPK.cs

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//! \file ArcMGPK.cs
//! \date Mon Nov 03 20:03:36 2014
//! \brief MGPK archive format.
//
// Copyright (C) 2014-2016 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;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Text;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
using GameRes.Utility;
namespace GameRes.Formats.Mg
{
internal class MgArchive : ArcFile
{
public readonly byte[] Key;
public MgArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
: base (arc, impl, dir)
{
Key = key;
}
}
public class MgOptions : ResourceOptions
{
public byte[] Key;
}
[Serializable]
public class MgScheme : ResourceScheme
{
public Dictionary<string, byte[]> KnownKeys;
}
[Export(typeof(ArchiveFormat))]
public class MgpkOpener : ArchiveFormat
{
public override string Tag { get { return "MGPK"; } }
public override string Description { get { return "MG resource archive"; } }
public override uint Signature { get { return 0x4b50474d; } } // MGPK
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public MgpkOpener ()
{
Extensions = new string[] { "pac" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (8);
if (count > 0xFFFFF)
return null;
long cur_offset = 0x0C;
var dir = new List<Entry> (count);
bool has_encrypted = false;
for (int i = 0; i < count; ++i)
{
uint name_length = file.View.ReadByte (cur_offset);
string name = file.View.ReadString (cur_offset+1, name_length, Encoding.UTF8);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = file.View.ReadUInt32 (cur_offset+0x20);
entry.Size = file.View.ReadUInt32 (cur_offset+0x24);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
has_encrypted = has_encrypted || name.HasAnyOfExtensions ("png", "txt");
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dir.Add (entry);
cur_offset += 0x30;
}
if (has_encrypted && KnownKeys.Count > 0)
{
var options = Query<MgOptions> (arcStrings.ArcEncryptedNotice);
if (options.Key != null)
return new MgArchive (file, this, dir, options.Key);
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var mgarc = arc as MgArchive;
Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
if (null == mgarc || null == mgarc.Key)
return input;
using (input)
{
byte[] data = new byte[entry.Size];
input.Read (data, 0, data.Length);
data = DecryptBlock (data, mgarc.Key);
if (entry.Name.HasExtension ("txt"))
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return DecompressStream (data);
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return new BinMemoryStream (data, entry.Name);
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}
}
private byte[] DecryptBlock (byte[] input, byte[] key)
{
key = (byte[])key.Clone();
for (int i = 0; i < input.Length; i++)
{
input[i] ^= key[i % key.Length];
key[i % key.Length] += 27;
}
return input;
}
private Stream DecompressStream (byte[] input)
{
byte[] output = new byte[input.Length * 2];
int output_size = lzf_decompress (input, ref output);
return new MemoryStream (output, 0, output_size);
}
private static int lzf_decompress (byte[] input, ref byte[] output)
{
int src = 0;
int dst = 0;
while (src < input.Length)
{
int count = input[src++];
if (count < 32)
{
++count;
if (dst + count > output.Length)
{
Array.Resize (ref output, Math.Max (checked(output.Length * 2), dst + count));
}
Buffer.BlockCopy (input, src, output, dst, count);
src += count;
dst += count;
}
else
{
int offset = (count & 31) << 8;
count >>= 5;
if (7 == count)
{
count += input[src++];
}
count += 2;
offset += input[src++] + 1;
if (offset > dst)
throw new InvalidFormatException();
if (dst + count > output.Length)
{
Array.Resize (ref output, Math.Max (checked(output.Length * 2), dst + count));
}
Binary.CopyOverlapped (output, dst-offset, dst, count);
dst += count;
}
}
return dst;
}
public override ResourceOptions GetDefaultOptions ()
{
return new MgOptions { Key = GetKey (Settings.Default.MGPKTitle) };
}
public override object GetAccessWidget ()
{
return new GUI.WidgetMGPK();
}
public static byte[] GetKey (string title)
{
byte[] key;
if (string.IsNullOrEmpty (title) || !KnownKeys.TryGetValue (title, out key))
return null;
return key;
}
public static Dictionary<string, byte[]> KnownKeys = new Dictionary<string, byte[]>();
public override ResourceScheme Scheme
{
get { return new MgScheme { KnownKeys = KnownKeys }; }
set { KnownKeys = ((MgScheme)value).KnownKeys; }
}
}
}