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(GRD): use common LzssStream class for decompression.

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morkt 2017-11-23 18:24:21 +04:00
parent c7ba369605
commit 0f7fb19f88
1 changed files with 14 additions and 122 deletions
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136
ArcFormats/Silky/ImageGRD.cs
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@ -2,7 +2,7 @@
//! \date Sun Apr 12 21:05:44 2015
//! \brief Silky's GRD image format.
//
// Copyright (C) 2015 by morkt
// Copyright (C) 2015-2017 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
@ -24,27 +24,17 @@
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Utility;
using GameRes.Compression;
namespace GameRes.Formats.Silky
{
internal class GrdMetaData : ImageMetaData
{
public int DataSize;
}
[Export(typeof(ImageFormat))]
public class GrdFormat : ImageFormat
{
public override string Tag { get { return "GRD"; } }
public override string Description { get { return "Silky's RGB image format"; } }
public override string Description { get { return "Silky's compressed bitmap format"; } }
public override uint Signature { get { return 0x5f504d43u; } } // 'CMP_'
public override void Write (Stream file, ImageData image)
@ -54,120 +44,22 @@ namespace GameRes.Formats.Silky
public override ImageMetaData ReadMetaData (IBinaryStream stream)
{
stream.Seek (4, SeekOrigin.Current);
int data_size = stream.ReadInt32();
stream.Seek (4, SeekOrigin.Current);
using (var reader = new Reader (stream.AsStream, 0x22)) // BMP header
{
reader.Unpack();
var bmp = reader.Data;
if (bmp[0] != 'B' || bmp[1] != 'M')
return null;
int width = LittleEndian.ToInt32 (bmp, 0x12);
int height = LittleEndian.ToInt32 (bmp, 0x16);
int bpp = LittleEndian.ToInt16 (bmp, 0x1c);
return new GrdMetaData
{
Width = (uint)width,
Height = (uint)height,
BPP = bpp,
DataSize = data_size,
};
}
using (var bmp = DecompressStream (stream))
return Bmp.ReadMetaData (bmp);
}
public override ImageData Read (IBinaryStream stream, ImageMetaData info)
{
var meta = (GrdMetaData)info;
using (var bmp = DecompressStream (stream))
return Bmp.Read (bmp, info);
}
internal IBinaryStream DecompressStream (IBinaryStream stream)
{
stream.Position = 12;
using (var reader = new Reader (stream.AsStream, meta.DataSize))
{
reader.Unpack();
byte[] pixels = reader.Data;
using (var bmp = new MemoryStream (reader.Data))
{
var decoder = new BmpBitmapDecoder (bmp,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource frame = decoder.Frames[0];
frame.Freeze();
return new ImageData (frame, info);
}
}
var input = new LzssStream (stream.AsStream, LzssMode.Decompress, true);
input.Config.FrameFill = 0x20;
return new BinaryStream (input, stream.Name);
}
}
// custom LZSS reader
//
internal class Reader : IDisposable
{
Stream m_input;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public Reader (Stream file, int dst_size)
{
m_input = file;
m_output = new byte[dst_size];
}
public void Unpack ()
{
var frame = new byte[0x1000];
int frame_pos = 0xfee;
for (int i = 0; i < frame_pos; ++i)
frame[i] = 32;
int ctl = 0;
int dst = 0;
while (dst < m_output.Length)
{
ctl >>= 1;
if (0 == (ctl & 0x100))
{
int b = m_input.ReadByte();
if (-1 == b)
break;
ctl = b | 0xff00;
}
if (0 != (ctl & 1))
{
int b = m_input.ReadByte();
if (-1 == b)
break;
m_output[dst++] = (byte)b;
frame[frame_pos++] = (byte)b;
frame_pos &= 0xfff;
}
else
{
int lo = m_input.ReadByte();
if (-1 == lo)
break;
int hi = m_input.ReadByte();
if (-1 == hi)
break;
int offset = (hi & 0xF0) << 4 | lo;
int count = (hi & 0xF) + 3;
for (int i = 0; i < count && dst < m_output.Length; ++i)
{
byte b = frame[(offset + i) & 0xfff];
m_output[dst++] = b;
frame[frame_pos++] = b;
frame_pos &= 0xfff;
}
}
}
}
#region IDisposable Members
public void Dispose ()
{
if (null != m_input)
{
m_input = null;
}
GC.SuppressFinalize (this);
}
#endregion
}
}