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263 lines
10 KiB
C#
263 lines
10 KiB
C#
//! \file ImageISG.cs
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//! \date Tue Mar 17 10:01:44 2015
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//! \brief ISM engine image format.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Text;
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Utility;
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namespace GameRes.Formats.ISM
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{
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internal class IsgMetaData : ImageMetaData
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{
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public byte Type;
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public int Colors;
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public uint Packed;
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public uint Unpacked;
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public int RecursionDepth;
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}
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[Export(typeof(ImageFormat))]
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public class IsgFormat : ImageFormat
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{
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public override string Tag { get { return "ISG"; } }
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public override string Description { get { return "ISM engine image format"; } }
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public override uint Signature { get { return 0x204d5349u; } } // 'ISM '
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public override void Write (Stream file, ImageData image)
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{
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throw new NotImplementedException ("IsgFormat.Write not implemented");
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}
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
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{
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var header = stream.ReadHeader (0x24);
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if (!header.AsciiEqual ("ISM IMAGEFILE\x00"))
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return null;
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int colors = header[0x23];
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if (0 == colors)
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colors = 256;
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return new IsgMetaData
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{
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Width = header.ToUInt16 (0x1d),
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Height = header.ToUInt16 (0x1f),
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BPP = 8,
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Type = header[0x10],
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Colors = colors,
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Packed = header.ToUInt32 (0x11),
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Unpacked = header.ToUInt32 (0x15),
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};
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}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
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var meta = (IsgMetaData)info;
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if (0x21 != meta.Type && 0x10 != meta.Type && 0x34 != meta.Type)
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throw new InvalidFormatException ("Unsupported ISM image type");
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var input = new Reader (stream, meta);
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var pixels = input.Unpack (this);
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var palette = new BitmapPalette (input.Palette);
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return ImageData.CreateFlipped (info, PixelFormats.Indexed8, palette, input.Data, info.iWidth);
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}
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internal class Reader
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{
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IBinaryStream m_input;
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byte[] m_data;
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int m_input_size;
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IsgMetaData m_info;
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public const int RecursionLimit = 32; // have seen 18 deep
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public Color[] Palette { get; private set; }
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public byte[] Data { get { return m_data; } }
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public Reader (IBinaryStream file, IsgMetaData info)
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{
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m_input = file;
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m_input_size = (int)info.Packed;
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m_info = info;
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}
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public byte[] Unpack (IsgFormat isg)
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{
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m_input.Position = 0x30;
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if (0x34 == m_info.Type)
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return Unpack34(isg);
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Palette = ImageFormat.ReadColorMap (m_input.AsStream);
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m_data = new byte[m_info.Width * m_info.Height];
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if (0x21 == m_info.Type)
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DecompressLzss (m_input_size, m_data);
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else
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Unpack10();
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return m_data;
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}
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public void Unpack10 ()
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{
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int dst = 0;
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int remaining = m_input_size;
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byte ctl = m_input.ReadUInt8();
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--remaining;
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int bit = 1;
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while (remaining > 0)
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{
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byte p = m_input.ReadUInt8();
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--remaining;
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if (0 != (ctl & bit))
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{
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for (int count = 2 + m_input.ReadUInt8(); count > 0; --count)
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m_data[dst++] = p;
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--remaining;
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}
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else
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{
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m_data[dst++] = p;
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}
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if (0x100 == (bit <<= 1))
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{
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ctl = m_input.ReadUInt8();
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--remaining;
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bit = 1;
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}
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}
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}
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public byte[] Unpack34 (IsgFormat isg)
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{
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if (m_info.RecursionDepth >= RecursionLimit)
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throw new InvalidFormatException ("Recursion limit reached for ISG image.");
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var base_name = m_input.ReadCString (0x10);
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var base_image = ReadBaseImage (base_name, isg);
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if (null == base_image)
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throw new InvalidFormatException ("Unable to read baseline ISG image.");
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int count = m_input.ReadInt32();
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int packed_size = m_input.ReadInt32();
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int ovl_ctl_size = m_info.iWidth * m_info.iHeight / 128;
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var overlay_info = m_input.ReadBytes (ovl_ctl_size);
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var overlay_data = new byte[count * 32 + 8];
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DecompressLzss (packed_size, overlay_data);
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int bit_count = 0;
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int ctl_src = 0;
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int data_src = 0;
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for (int y = 0; y < m_info.iHeight; y += 4)
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for (int x = 0; x < m_info.iWidth; x += 4)
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{
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if (((1 << bit_count) & overlay_info[ctl_src]) != 0)
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{
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int dst = y * m_info.iWidth + x;
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for (int r = 0; r < 4; ++r)
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{
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base_image[dst ] = overlay_data[data_src++];
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base_image[dst+1] = overlay_data[data_src++];
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base_image[dst+2] = overlay_data[data_src++];
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base_image[dst+3] = overlay_data[data_src++];
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dst += m_info.iWidth;
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}
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}
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if (++bit_count == 8)
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{
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bit_count = 0;
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++ctl_src;
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}
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}
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return m_data = base_image;
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}
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internal void DecompressLzss (int remaining, byte[] output)
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{
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int dst = 0;
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var frame = new byte[2048];
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int frame_pos = 2039;
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byte ctl = m_input.ReadUInt8();
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--remaining;
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int bit = 0x80;
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while (remaining > 0)
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{
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if (0 != (ctl & bit))
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{
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byte hi = m_input.ReadUInt8();
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byte lo = m_input.ReadUInt8();
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remaining -= 2;
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int offset = (hi & 7) << 8 | lo;
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for (int count = (hi >> 3) + 3; count > 0; --count)
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{
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byte p = frame[offset];
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frame[frame_pos] = p;
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output[dst++] = p;
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offset = (offset + 1) & 0x7ff;
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frame_pos = (frame_pos + 1) & 0x7ff;
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}
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}
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else
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{
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byte p = m_input.ReadUInt8();
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--remaining;
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output[dst++] = p;
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frame[frame_pos] = p;
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frame_pos = (frame_pos + 1) & 0x7ff;
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}
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if (0 == (bit >>= 1))
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{
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ctl = m_input.ReadUInt8();
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--remaining;
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bit = 0x80;
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}
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}
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}
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internal byte[] ReadBaseImage (string name, IsgFormat isg)
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{
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if (!VFS.FileExists (name))
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{
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if (name.Length <= 12)
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return null;
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name = name.Substring (0, 12);
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if (!VFS.FileExists (name))
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return null;
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}
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using (var base_file = VFS.OpenBinaryStream (name))
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{
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var base_info = isg.ReadMetaData (base_file) as IsgMetaData;
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if (null == base_info || base_info.Width != m_info.Width || base_info.Height != m_info.Height)
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throw new InvalidFormatException ("Invalid baseline ISG image.");
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base_info.RecursionDepth = m_info.RecursionDepth + 1;
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base_info.FileName = name;
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var reader = new Reader (base_file, base_info);
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var pixels = reader.Unpack (isg);
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this.Palette = reader.Palette;
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return pixels;
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}
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}
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}
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}
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}
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