GARbro-mirror/ArcFormats/Masys/ArcMGD.cs

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2015-05-12 00:23:32 +08:00
//! \file ArcMGD.cs
//! \date Sun May 10 18:11:01 2015
//! \brief MEGU 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;
// MEGU
// Masys Enhanced Game Unit
namespace GameRes.Formats.Megu
{
[Export(typeof(ArchiveFormat))]
public class MgdOpener : ArchiveFormat
{
public override string Tag { get { return "MGD"; } }
public override string Description { get { return "Masys resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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internal static readonly string Key = "Powerd by Masys";
public override ArcFile TryOpen (ArcView file)
{
uint signature = file.View.ReadUInt32 (0);
if (0x44474d != (signature & 0xffffff)) // 'MGD'
return null;
int count = file.View.ReadInt16 (0x20);
if (count <= 0)
return null;
int flag = file.View.ReadUInt16 (3);
var dir = new List<Entry> (count);
int index_offset = 0x22;
byte[] name_buf = new byte[16];
for (uint i = 0; i < count; ++i)
{
int name_size = file.View.ReadByte (index_offset+1);
if (0 == name_size)
return null;
if (name_size > name_buf.Length)
Array.Resize (ref name_buf, name_size);
file.View.Read (index_offset+2, name_buf, 0, (uint)name_size);
if (100 == flag)
Decrypt (name_buf, 0, name_size);
string name = Encodings.cp932.GetString (name_buf, 0, name_size);
index_offset += 2 + name_size;
uint offset = file.View.ReadUInt32 (index_offset+4);
var entry = AutoEntry.Create (file, offset, name);
entry.Size = file.View.ReadUInt32 (index_offset);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 8;
}
return new ArcFile (file, this, dir);
}
internal static void Decrypt (byte[] buffer, int offset, int length)
{
for (int i = 0; i < length; ++i)
{
buffer[offset+i] ^= (byte)Key[i%0xf];
}
}
}
}