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256 lines
8.6 KiB
C#
256 lines
8.6 KiB
C#
//! \file ImageSGF.cs
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//! \date 2018 Jun 11
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//! \brief Eternity engine image format.
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//
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// Copyright (C) 2018 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.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using GameRes.Utility;
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namespace GameRes.Formats.Eternity
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{
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internal class SgfMetaData : ImageMetaData
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{
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public bool HasAlpha;
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public int BlockSize;
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public uint DataOffset;
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public uint AlphaOffset;
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}
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[Export(typeof(ImageFormat))]
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public class SgfFormat : ImageFormat
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{
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public override string Tag { get { return "SGF"; } }
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public override string Description { get { return "Eternity engine image format"; } }
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public override uint Signature { get { return 0x644753; } } // 'SG'
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public SgfFormat ()
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{
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Signatures = new uint[] { 0x644753, 0 };
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}
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x20);
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if (!header.AsciiEqual ("SG"))
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return null;
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int version = header.ToUInt16 (2);
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if (version != 100)
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return null;
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return new SgfMetaData {
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Width = header.ToUInt16 (4),
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Height = header.ToUInt16 (6),
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BPP = 24,
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HasAlpha = header.ToInt32 (8) != 0,
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BlockSize = header.ToUInt16 (0xC),
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DataOffset = header.ToUInt32 (0x14),
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AlphaOffset = header.ToUInt32 (0x1C),
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};
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var reader = new SgfReader (file, (SgfMetaData)info);
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var pixels = reader.Unpack();
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return ImageData.Create (info, reader.Format, null, pixels);
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("SgfFormat.Write not implemented");
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}
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}
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internal class SgfReader
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{
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IBinaryStream m_input;
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SgfMetaData m_info;
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byte[] m_output;
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public byte[] Data { get { return m_output; } }
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public PixelFormat Format { get; private set; }
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public SgfReader (IBinaryStream input, SgfMetaData info)
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{
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m_input = input;
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m_info = info;
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m_output = new byte[3 * info.Width * info.Height];
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Format = PixelFormats.Bgr24;
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}
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public byte[] Unpack ()
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{
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long next_pos = m_info.DataOffset;
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int height = (int)m_info.Height;
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int dst = 0;
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byte b = 0, g = 0, r = 0;
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for (int y = 0; y < height; ++y)
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{
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int start_pos = dst;
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if (0 == (y % m_info.BlockSize))
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{
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m_input.Position = next_pos;
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next_pos += m_input.ReadUInt32();
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b = m_input.ReadUInt8();
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g = m_input.ReadUInt8();
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r = m_input.ReadUInt8();
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m_input.ReadUInt8();
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mask1 = mask2 = mask3 = mask4 = mask5 = 1;
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}
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for (uint x = 0; x < m_info.Width; ++x)
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{
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b = GetNextByte (b);
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g = GetNextByte (g);
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r = GetNextByte (r);
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m_output[dst++] = b;
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m_output[dst++] = g;
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m_output[dst++] = r;
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}
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b = m_output[start_pos];
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g = m_output[start_pos+1];
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r = m_output[start_pos+2];
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}
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if (m_info.HasAlpha)
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{
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var alpha = ReadAlpha();
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if (alpha != null)
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{
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var pixels = new byte[m_info.iWidth * m_info.iHeight * 4];
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dst = 0;
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int p = 0;
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int a = 0;
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while (dst < pixels.Length)
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{
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pixels[dst++] = m_output[p++];
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pixels[dst++] = m_output[p++];
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pixels[dst++] = m_output[p++];
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pixels[dst++] = alpha[a++];
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}
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m_output = pixels;
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Format = PixelFormats.Bgra32;
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}
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}
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return m_output;
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}
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byte[] ReadAlpha ()
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{
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m_input.Position = m_info.AlphaOffset;
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var signature = m_input.ReadUInt16();
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if (0x2041 == signature) // 'A '
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return ReadASection();
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else if (0x4D42 == signature) // 'BM'
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return ReadBmpSection();
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else
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return null;
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}
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byte[] ReadASection ()
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{
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var alpha = new byte[m_info.iWidth * m_info.iHeight];
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m_input.Position = m_info.AlphaOffset + 8;
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int block_size = m_input.ReadUInt16();
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m_input.Position = m_info.AlphaOffset + 0x10;
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uint offset = m_input.ReadUInt32();
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uint next_pos = m_info.AlphaOffset + offset;
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int height = (int)m_info.Height;
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int dst = alpha.Length - m_info.iWidth;
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byte a = 0;
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for (int y = 0; y < height; ++y)
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{
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int start_pos = dst;
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if (0 == (y % block_size))
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{
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m_input.Position = next_pos;
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next_pos += m_input.ReadUInt32();
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a = (byte)m_input.ReadUInt32();
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mask1 = mask2 = mask3 = mask4 = mask5 = 1;
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}
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for (uint x = 0; x < m_info.Width; ++x)
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{
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a = GetNextByte (a);
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alpha[dst++] = a;
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}
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a = alpha[start_pos];
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dst = start_pos - m_info.iWidth;
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}
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return alpha;
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}
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byte[] ReadBmpSection ()
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{
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// throw new NotImplementedException ("ReadBmpSection not implemented.");
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return null;
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}
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uint mask1;
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uint mask2;
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uint mask3;
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uint mask4;
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uint mask5;
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uint in1;
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uint in2;
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uint in3;
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uint in4;
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uint in5;
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byte GetNextByte (byte prev)
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{
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if (mask1 == 1)
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in1 = m_input.ReadUInt32();
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if ((mask1 & in1) == 0)
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{
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if (mask2 == 1)
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in2 = m_input.ReadUInt32();
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if ((mask2 & in2) != 0)
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{
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if (mask3 == 1)
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in3 = m_input.ReadUInt32();
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if (mask4 == 1)
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in4 = m_input.ReadUInt32();
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uint diff = (in4 & 0xF) + 1;
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if ((mask3 & in3) != 0)
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prev -= (byte)diff;
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else
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prev += (byte)diff;
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in4 >>= 4;
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mask3 = Binary.RotL (mask3, 1);
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mask4 = Binary.RotL (mask4, 4);
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}
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else
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{
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if (mask5 == 1)
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in5 = m_input.ReadUInt32();
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prev = (byte)in5;
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in5 >>= 8;
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mask5 = Binary.RotL (mask5, 8);
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}
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mask2 = Binary.RotL (mask2, 1);
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}
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mask1 = Binary.RotL (mask1, 1);
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return prev;
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}
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}
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}
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