GARbro-mirror/ArcFormats/Cherry/ImageGRP.cs

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2015-06-25 09:40:55 +08:00
//! \file ImageGRP.cs
//! \date Wed Jun 24 22:14:41 2015
//! \brief Cherry Soft compressed image format.
//
// 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Compression;
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using GameRes.Utility;
namespace GameRes.Formats.Cherry
{
internal class GrpMetaData : ImageMetaData
{
public int PackedSize;
public int UnpackedSize;
public int Offset;
}
[Export(typeof(ImageFormat))]
public class GrpFormat : ImageFormat
{
public override string Tag { get { return "GRP/CHERRY"; } }
public override string Description { get { return "Cherry Soft comprressed image format"; } }
public override uint Signature { get { return 0; } }
public GrpFormat ()
{
Extensions = new string[] { "grp" };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
var header = new byte[0x18];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
uint width = LittleEndian.ToUInt32 (header, 0);
uint height = LittleEndian.ToUInt32 (header, 4);
int bpp = LittleEndian.ToInt32 (header, 8);
int packed_size = LittleEndian.ToInt32 (header, 0x0C);
int unpacked_size = LittleEndian.ToInt32 (header, 0x10);
if (0 == width || 0 == height || width > 0x7fff || height > 0x7fff
|| (bpp != 24 && bpp != 8)
|| unpacked_size <= 0 || packed_size < 0)
return null;
return new GrpMetaData
{
Width = width,
Height = height,
BPP = bpp,
PackedSize = packed_size,
UnpackedSize = unpacked_size,
Offset = LittleEndian.ToInt32 (header, 0x14),
};
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = info as GrpMetaData;
if (null == meta)
throw new ArgumentException ("GrpFormat.Read should be supplied with GrpMetaData", "info");
var reader = new GrpReader (stream, meta);
return reader.CreateImage();
}
public override void Write (Stream file, ImageData image)
{
throw new NotImplementedException ("GrpFormat.Write not implemented");
}
}
internal class GrpReader
{
GrpMetaData m_info;
Stream m_input;
byte[] m_image_data;
int m_stride;
public PixelFormat Format { get; private set; }
public BitmapPalette Palette { get; private set; }
public byte[] Pixels { get { return m_image_data; } }
public GrpReader (Stream input, GrpMetaData info)
{
m_info = info;
m_input = input;
if (8 == info.BPP)
Format = PixelFormats.Indexed8;
else if (24 == info.BPP)
Format = PixelFormats.Bgr24;
else
throw new NotSupportedException ("Not supported GRP image depth");
m_stride = (int)m_info.Width*((Format.BitsPerPixel+7)/8);
}
public ImageData CreateImage ()
{
m_input.Position = 0x18;
int data_size = m_info.UnpackedSize;
if (m_info.PackedSize != 0)
data_size = m_info.PackedSize;
if (0x0f0f0f0f == m_info.Offset && 0x18 + data_size == m_input.Length)
return ReadV2();
else if (8 == m_info.BPP && 0x418 == m_info.Offset ||
24 == m_info.BPP && 0x018 == m_info.Offset)
return ReadV1();
else
throw new InvalidFormatException();
}
private ImageData ReadV1 ()
{
if (8 == m_info.BPP)
{
var palette_data = new byte[0x400];
if (palette_data.Length != m_input.Read (palette_data, 0, palette_data.Length))
throw new InvalidFormatException ("Unexpected end of file");
SetPalette (palette_data);
}
var packed = new byte[m_info.PackedSize];
if (packed.Length != m_input.Read (packed, 0, packed.Length))
throw new InvalidFormatException ("Unexpected end of file");
for (int i = 0; i < packed.Length; ++i)
packed[i] ^= (byte)i;
using (var input = new MemoryStream (packed))
using (var reader = new LzssReader (input, packed.Length, m_info.UnpackedSize))
{
reader.Unpack();
m_image_data = new byte[m_info.UnpackedSize];
// flip pixels vertically
int dst = 0;
for (int src = m_stride * ((int)m_info.Height-1); src >= 0; src -= m_stride)
{
Buffer.BlockCopy (reader.Data, src, m_image_data, dst, m_stride);
dst += m_stride;
}
}
return ImageData.Create (m_info, Format, Palette, m_image_data);
}
private ImageData ReadV2 ()
{
if (0 != m_info.PackedSize)
{
using (var reader = new LzssReader (m_input, m_info.PackedSize, m_info.UnpackedSize))
{
reader.Unpack();
m_image_data = reader.Data;
}
}
else
{
m_image_data = new byte[m_info.UnpackedSize];
if (m_image_data.Length != m_input.Read (m_image_data, 0, m_image_data.Length))
throw new InvalidFormatException ("Unexpected end of file");
}
int pixels_offset = 0;
if (8 == m_info.BPP)
{
SetPalette (m_image_data);
pixels_offset += 0x400;
}
if (0 == pixels_offset)
return ImageData.Create (m_info, Format, Palette, m_image_data);
if (pixels_offset + m_stride*(int)m_info.Height > m_image_data.Length)
throw new InvalidFormatException();
unsafe
{
fixed (byte* pixels = &m_image_data[pixels_offset])
{
var bitmap = BitmapSource.Create ((int)m_info.Width, (int)m_info.Height,
ImageData.DefaultDpiX, ImageData.DefaultDpiY, Format, Palette,
(IntPtr)pixels, m_image_data.Length-pixels_offset, m_stride);
bitmap.Freeze();
return new ImageData (bitmap, m_info);
}
}
}
private void SetPalette (byte[] palette_data)
{
if (palette_data.Length < 0x400)
throw new InvalidFormatException();
var palette = new Color[0x100];
for (int i = 0; i < palette.Length; ++i)
{
int c = i * 4;
palette[i] = Color.FromRgb (palette_data[c+2], palette_data[c+1], palette_data[c]);
}
Palette = new BitmapPalette (palette);
}
}
}