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(GRP): support encrypted images.

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This commit is contained in:
morkt 2019-04-21 00:20:16 +04:00
parent 8315575c75
commit 07b2e1488e
1 changed files with 73 additions and 83 deletions
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156
ArcFormats/Cherry/ImageGRP.cs
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@ -2,7 +2,7 @@
//! \date Wed Jun 24 22:14:41 2015
//! \brief Cherry Soft compressed image format.
//
// Copyright (C) 2015 by morkt
// Copyright (C) 2015-2019 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
@ -29,7 +29,6 @@ using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Cherry
{
@ -40,6 +39,7 @@ namespace GameRes.Formats.Cherry
public int Offset;
public int HeaderSize;
public bool AlphaChannel;
public bool IsEncrypted;
}
[Export(typeof(ImageFormat))]
@ -57,6 +57,11 @@ namespace GameRes.Formats.Cherry
public override ImageMetaData ReadMetaData (IBinaryStream stream)
{
var header = stream.ReadHeader (0x18);
return UnpackHeader (header);
}
internal GrpMetaData UnpackHeader (CowArray<byte> header)
{
uint width = header.ToUInt32 (0);
uint height = header.ToUInt32 (4);
int bpp = header.ToInt32 (8);
@ -81,8 +86,7 @@ namespace GameRes.Formats.Cherry
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (GrpMetaData)info;
var reader = new GrpReader (file.AsStream, meta);
var reader = new GrpReader (file.AsStream, (GrpMetaData)info);
return reader.CreateImage();
}
@ -127,6 +131,37 @@ namespace GameRes.Formats.Cherry
}
}
[Export(typeof(ImageFormat))]
public class GrpEncFormat : GrpFormat
{
public override string Tag { get { return "GRP/ENC"; } }
public override string Description { get { return "Cherry Soft encrypted image format"; } }
public override uint Signature { get { return 0; } }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x18);
if (header[3] != 0xA5 || header[7] != 0x35)
return null;
header[0] ^= 0x5A; // 0xA53CC35A
header[1] ^= 0xC3;
header[2] ^= 0x3C;
header[3] ^= 0xA5;
header[4] ^= 0x05; // 0x35421005
header[5] ^= 0x10;
header[6] ^= 0x42;
header[7] ^= 0x35;
header[0x10] ^= 0x5D; // 0xCF42355D
header[0x11] ^= 0x35;
header[0x12] ^= 0x42;
header[0x13] ^= 0xCF;
var info = UnpackHeader (header);
if (info != null)
info.IsEncrypted = true;
return info;
}
}
internal class GrpReader
{
GrpMetaData m_info;
@ -150,7 +185,7 @@ namespace GameRes.Formats.Cherry
Format = m_info.AlphaChannel ? PixelFormats.Bgra32 : PixelFormats.Bgr32;
else
throw new NotSupportedException ("Not supported GRP image depth");
m_stride = (int)m_info.Width*((Format.BitsPerPixel+7)/8);
m_stride = m_info.iWidth * ((Format.BitsPerPixel + 7) / 8);
}
public ImageData CreateImage ()
@ -165,8 +200,10 @@ namespace GameRes.Formats.Cherry
else if (8 == m_info.BPP && 0x418 == m_info.Offset ||
24 == m_info.BPP && 0x018 == m_info.Offset)
return ReadV1();
else if (m_info.IsEncrypted)
return ReadEncrypted();
else if (true) // FIXME
return ReadV3 (0xFFFF != m_info.Offset);
return ReadV3 (m_input, 0xFFFF != m_info.Offset);
else
throw new InvalidFormatException();
}
@ -174,12 +211,8 @@ namespace GameRes.Formats.Cherry
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);
}
Palette = ImageFormat.ReadPalette (m_input);
var packed = new byte[m_info.PackedSize];
if (packed.Length != m_input.Read (packed, 0, packed.Length))
throw new InvalidFormatException ("Unexpected end of file");
@ -187,99 +220,56 @@ namespace GameRes.Formats.Cherry
packed[i] ^= (byte)i;
using (var input = new MemoryStream (packed))
using (var reader = new LzssReader (input, packed.Length, m_info.UnpackedSize))
using (var lzs = new LzssStream (input))
{
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)
for (int dst = m_stride * (m_info.iHeight-1); dst >= 0; dst -= m_stride)
{
Buffer.BlockCopy (reader.Data, src, m_image_data, dst, m_stride);
dst += m_stride;
lzs.Read (m_image_data, dst, m_stride);
}
}
return ImageData.Create (m_info, Format, Palette, m_image_data);
return ImageData.Create (m_info, Format, Palette, m_image_data, m_stride);
}
// DOUBLE
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);
}
}
return ReadV3 (m_input, true);
return ImageFromStream (m_input, true);
}
// Exile ~Blood Royal 2~ : flipped == true
// Gakuen ~Nerawareta Chitai~ : flipped == false
private ImageData ReadV3 (bool flipped)
private ImageData ReadV3 (Stream input, bool flipped)
{
using (var lzs = new LzssStream (m_input, LzssMode.Decompress, true))
{
if (8 == m_info.BPP)
{
var palette_data = new byte[0x400];
if (palette_data.Length != lzs.Read (palette_data, 0, palette_data.Length))
throw new InvalidFormatException ("Unexpected end of file");
SetPalette (palette_data);
}
m_image_data = new byte[m_stride * (int)m_info.Height];
if (m_image_data.Length != lzs.Read (m_image_data, 0, m_image_data.Length))
throw new InvalidFormatException();
if (flipped)
return ImageData.CreateFlipped (m_info, Format, Palette, m_image_data, m_stride);
else
return ImageData.Create (m_info, Format, Palette, m_image_data, m_stride);
}
using (var lzs = new LzssStream (input, LzssMode.Decompress, true))
return ImageFromStream (lzs, flipped);
}
private void SetPalette (byte[] palette_data)
private ImageData ImageFromStream (Stream input, bool flipped)
{
if (palette_data.Length < 0x400)
if (8 == m_info.BPP)
Palette = ImageFormat.ReadPalette (input);
m_image_data = new byte[m_stride * m_info.iHeight];
if (m_image_data.Length != input.Read (m_image_data, 0, m_image_data.Length))
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);
if (flipped)
return ImageData.CreateFlipped (m_info, Format, Palette, m_image_data, m_stride);
else
return ImageData.Create (m_info, Format, Palette, m_image_data, m_stride);
}
private ImageData ReadEncrypted ()
{
var data = new byte[m_input.Length - m_info.HeaderSize];
m_input.Read (data, 0, data.Length);
Pak2Opener.Decrypt (data, 0, data.Length);
using (var input = new MemoryStream (data))
return ReadV3 (input, true);
}
}
}