GARbro-mirror/Legacy/Kurumi/ImageGRA.cs

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2019-03-04 07:59:39 +08:00
//! \file ImageGRA.cs
//! \date 2019 Feb 27
//! \brief Kurumi encrypted image.
//
// Copyright (C) 2019 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
// [000324][Kurumi] 4m
namespace GameRes.Formats.Kurumi
{
[Export(typeof(ImageFormat))]
public class GraFormat : ImageFormat
{
public override string Tag { get { return "GRA/KURUMI"; } }
public override string Description { get { return "Kurumi encrypted image"; } }
public override uint Signature { get { return 0xEE2FA397; } }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x14).ToArray();
Decrypt (header);
if (header.ToInt32 (0) != 0x10)
return null;
return new ImageMetaData {
Width = header.ToUInt16 (0x10),
Height = header.ToUInt16 (0x12),
OffsetX = header.ToInt16 (0xC),
OffsetY = header.ToInt16 (0xE),
BPP = 16,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var data = file.ReadBytes ((int)file.Length);
Decrypt (data);
var pixels = new byte[info.iWidth * info.iHeight * 2];
int src = 0x14;
int dst = 0;
while (dst < pixels.Length)
{
byte p0 = data[src++];
byte p1 = data[src++];
pixels[dst++] = (byte)((p1 >> 2) & 0x1F | p0 & 0xE0);
pixels[dst++] = (byte)((p0 & 0x1F) << 2 | p1 & 3);
}
return ImageData.Create (info, PixelFormats.Bgr555, null, pixels);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GraFormat.Write not implemented");
}
void Decrypt (byte[] data)
{
int seed = 34567;
for (int i = 0; i < data.Length; ++i)
{
data[i] -= (byte)(seed >> 8);
seed = 5 * seed - 1;
}
}
}
}