GARbro-mirror/Legacy/Yaneurao/ImageGTO.cs

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2018-12-20 19:06:01 +08:00
//! \file ImageGTO.cs
//! \date 2018 Dec 20
//! \brief Yaneurao obfuscated bitmap.
//
// 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
// [000428][Apple Pie] Seishun Ouka
namespace GameRes.Formats.Yaneurao
{
[Export(typeof(ImageFormat))]
public class GtoFormat : ImageFormat
{
public override string Tag { get { return "GTO"; } }
public override string Description { get { return "Yaneurao obfuscated bitmap"; } }
public override uint Signature { get { return 0; } }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (2);
if (!header.AsciiEqual ("NY"))
return null;
file.Position = 0;
using (var input = OpenGtoStream (file))
return Bmp.ReadMetaData (input);
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
using (var input = OpenGtoStream (file))
return Bmp.Read (input, info);
}
internal IBinaryStream OpenGtoStream (IBinaryStream file)
{
var input = new SubFilterStream (file.AsStream, 0xC, true);
return new BinaryStream (input, file.Name);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GtoFormat.Write not implemented");
}
}
public class SubFilterStream : ProxyStream
{
private byte m_key;
public override bool CanWrite { get { return false; } }
public SubFilterStream (Stream stream, byte key, bool leave_open = false)
: base (stream, leave_open)
{
m_key = key;
}
#region System.IO.Stream methods
public override int Read (byte[] buffer, int offset, int count)
{
int read = BaseStream.Read (buffer, offset, count);
for (int i = 0; i < read; ++i)
{
buffer[offset+i] -= m_key;
}
return read;
}
public override int ReadByte ()
{
int b = BaseStream.ReadByte();
if (-1 != b)
{
b = (b - m_key) & 0xFF;
}
return b;
}
#endregion
}
}