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317 lines
11 KiB
C#
317 lines
11 KiB
C#
//! \file ImageGBP.cs
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//! \date 2018 Aug 27
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//! \brief SVIU System 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;
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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.Sviu
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{
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internal class GbpMetaData : ImageMetaData
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{
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public int HeaderSize;
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public int DataOffset;
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public int Method;
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}
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[Export(typeof(ImageFormat))]
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public class GbpFormat : ImageFormat
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{
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public override string Tag { get { return "GBP"; } }
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public override string Description { get { return "SVIU system image format"; } }
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public override uint Signature { get { return 0x50425947; } } // 'GYBP'
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x14);
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file.Seek (-0x13, SeekOrigin.End);
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var key = file.ReadBytes (0x13);
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for (int i = 4; i < 0x14; i += 2)
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{
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header[i] ^= key[0x10];
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header[i+1] ^= key[0x11];
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}
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for (int i = 0; i < 0x10; ++i)
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{
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header[i+4] -= key[i];
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}
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return new GbpMetaData {
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Width = header.ToUInt16 (0xE),
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Height = header.ToUInt16 (0x10),
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BPP = header.ToUInt16 (0x12),
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HeaderSize = header.ToInt32 (4),
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DataOffset = header.ToInt32 (8),
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Method = header.ToUInt16 (0xC),
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};
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// 0x14 -> 32-bit checksum after encryption
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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 GbpReader (file, (GbpMetaData)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 ("GbpFormat.Write not implemented");
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}
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}
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internal class GbpReader
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{
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IBinaryStream m_input;
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GbpMetaData m_info;
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byte[] m_output;
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int m_width;
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int m_height;
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int m_channels;
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public PixelFormat Format { get; private set; }
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public GbpReader (IBinaryStream input, GbpMetaData info)
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{
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m_input = input;
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m_info = info;
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if (32 == info.BPP)
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Format = PixelFormats.Bgra32;
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else
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Format = PixelFormats.Bgr32;
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m_width = (int)m_info.Width;
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m_height = (int)m_info.Height;
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m_output = new byte[4 * m_width * m_height];
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m_channels = m_info.BPP / 8;
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bits_pos = new int[m_channels+1];
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data_pos = new int[m_channels+1];
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}
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public byte[] Unpack ()
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{
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ReadOffsetsTable();
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if (3 == m_info.Method)
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UnpackBlocks();
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else
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UnpackFlat();
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return m_output;
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}
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byte[] m_frame = new byte[0x1000];
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int[] bits_pos;
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int[] data_pos;
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void ReadOffsetsTable ()
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{
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m_input.Position = m_info.HeaderSize;
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bits_pos[0] = m_info.HeaderSize + 4 * m_channels;
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for (int i = 0; i < m_channels; ++i)
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{
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bits_pos[i+1] = bits_pos[i] + m_input.ReadInt32();
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}
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m_input.Position = m_info.DataOffset;
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data_pos[0] = m_info.DataOffset + 4 * m_channels;
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for (int i = 0; i < m_channels; ++i)
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{
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data_pos[i+1] = data_pos[i] + m_input.ReadInt32();
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}
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}
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void UnpackFlat ()
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{
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var channel = new byte[m_width * m_height];
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for (int i = 0; i < 3; ++i)
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{
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m_input.Position = bits_pos[i];
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var bits = m_input.ReadBytes (bits_pos[i+1] - bits_pos[i]);
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m_input.Position = data_pos[i];
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if (1 == m_info.Method)
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{
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int bits_src = 0;
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int bit_mask = 0x80;
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int cdst = 0;
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while (cdst < channel.Length)
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{
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if (0 == bit_mask)
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{
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++bits_src;
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bit_mask = 0x80;
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}
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if ((bits[bits_src] & bit_mask) != 0)
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{
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int offset = m_input.ReadUInt16();
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int count = (offset & 0xF) + 3;
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offset = (offset >> 4) + 1;
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Binary.CopyOverlapped (channel, cdst - offset, cdst, count);
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cdst += count;
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}
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else
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{
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channel[cdst++] = m_input.ReadUInt8();
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}
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bit_mask >>= 1;
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}
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}
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else if (2 == m_info.Method)
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{
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LzssUnpack (bits, 0, channel, channel.Length);
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}
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int dst = i;
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byte accum = 0;
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for (int csrc = 0; csrc < channel.Length; ++csrc)
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{
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accum += channel[csrc];
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m_output[dst] = accum;
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dst += 4;
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}
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}
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if (4 == m_channels)
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{
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m_input.Position = data_pos[3];
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int dst = 3;
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while (dst < m_output.Length)
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{
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byte a = m_input.ReadUInt8();
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int count = 1;
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if (a == 0 || a == 0xFF)
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{
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count += m_input.ReadUInt8();
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}
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while (count --> 0)
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{
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m_output[dst] = a;
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dst += 4;
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}
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}
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}
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}
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void UnpackBlocks ()
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{
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var channel = new byte[m_width * m_height];
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int stride = m_width * 4;
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int block_stride = stride * 8;
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for (int i = 0; i < m_channels; ++i)
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{
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m_input.Position = bits_pos[i];
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int block_bits_length = m_input.ReadInt32();
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int block_data_length = m_input.ReadInt32();
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int chunk_count = m_input.ReadInt32();
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var bits = m_input.ReadBytes (bits_pos[i+1] - bits_pos[i] - 12);
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int bits_src = block_bits_length + block_data_length;
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m_input.Position = data_pos[i];
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LzssUnpack (bits, bits_src, channel, chunk_count);
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int csrc = 0;
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bits_src = 0;
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int block_src = block_bits_length;
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int dst_block = i;
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int bit_mask = 0x80;
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for (int y = 0; y < m_height; y += 8)
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{
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int block_height = Math.Min (8, m_height - y);
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int dst_block_x = dst_block;
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for (int x = 0; x < m_width; x += 8)
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{
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int block_width = Math.Min (8, m_width - x);
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if (0 == bit_mask)
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{
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bit_mask = 0x80;
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++bits_src;
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}
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int dst_row = dst_block_x;
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if ((bit_mask & bits[bits_src]) != 0)
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{
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byte b = bits[block_src++];
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for (int by = 0; by < block_height; ++by)
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{
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int dst = dst_row;
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for (int bx = 0; bx < block_width; ++bx)
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{
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m_output[dst] = b;
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dst += 4;
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}
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dst_row += stride;
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}
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}
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else
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{
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for (int by = 0; by < block_height; ++by)
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{
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int dst = dst_row;
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for (int bx = 0; bx < block_width; ++bx)
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{
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m_output[dst] = channel[csrc++];
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dst += 4;
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}
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dst_row += stride;
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}
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}
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dst_block_x += 32;
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bit_mask >>= 1;
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}
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dst_block += block_stride;
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}
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}
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}
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void LzssUnpack (byte[] ctl_bits, int bits_src, byte[] output, int output_length)
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{
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for (int j = 0; j < m_frame.Length; ++j)
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m_frame[j] = 0;
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int dst = 0;
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int bit_mask = 0x80;
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int frame_pos = 0xFEE;
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while (dst < output_length)
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{
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if (0 == bit_mask)
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{
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bit_mask = 0x80;
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++bits_src;
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}
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if ((bit_mask & ctl_bits[bits_src]) != 0)
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{
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int offset = m_input.ReadUInt16();
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int count = (offset & 0xF) + 3;
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offset >>= 4;
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while (count --> 0)
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{
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byte v = m_frame[offset++ & 0xFFF];
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output[dst++] = m_frame[frame_pos++ & 0xFFF] = v;
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}
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}
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else
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{
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output[dst++] = m_frame[frame_pos++ & 0xFFF] = m_input.ReadUInt8();
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}
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bit_mask >>= 1;
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}
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}
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}
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}
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