150 lines
3.9 KiB
C#
150 lines
3.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using UniversalEditor.Compression.Puyo.Internal.CompressionDictionaries;
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namespace UniversalEditor.Compression.Puyo.Internal.Compressors
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{
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public class LZ01 : PuyoCompressionModule
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{
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public LZ01()
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{
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base.Name = "LZ01";
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base.CanCompress = true;
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base.CanDecompress = true;
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}
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public override MemoryStream Decompress(ref Stream data)
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{
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MemoryStream result;
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try
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{
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uint num = data.ReadUInt(4L);
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uint num2 = data.ReadUInt(8L);
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byte[] array = data.ToByteArray();
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byte[] array2 = new byte[(int)((uint)((UIntPtr)num2))];
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byte[] array3 = new byte[4096];
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uint num3 = 16u;
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uint num4 = 0u;
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uint num5 = 4078u;
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while (num3 < num && num4 < num2)
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{
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byte b = array[(int)((uint)((UIntPtr)num3))];
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num3 += 1u;
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for (int i = 0; i < 8; i++)
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{
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if (((int)b & 1 << i) > 0)
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{
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array2[(int)((uint)((UIntPtr)num4))] = array[(int)((uint)((UIntPtr)num3))];
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array3[(int)((uint)((UIntPtr)num5))] = array2[(int)((uint)((UIntPtr)num4))];
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num3 += 1u;
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num4 += 1u;
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num5 = (num5 + 1u & 4095u);
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}
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else
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{
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int num6 = (array[(int)((uint)((UIntPtr)(num3 + 1u)))] >> 4 & 15) << 8 | (int)array[(int)((uint)((UIntPtr)num3))];
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int num7 = (int)((array[(int)((uint)((UIntPtr)(num3 + 1u)))] & 15) + 3);
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num3 += 2u;
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for (int j = 0; j < num7; j++)
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{
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array2[(int)((IntPtr)((long)((ulong)num4 + (ulong)((long)j))))] = array3[num6 + j & 4095];
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array3[(int)((uint)((UIntPtr)num5))] = array2[(int)((IntPtr)((long)((ulong)num4 + (ulong)((long)j))))];
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num5 = (num5 + 1u & 4095u);
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}
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num4 += (uint)num7;
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}
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if (num3 >= num || num4 >= num2)
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{
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break;
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}
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}
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}
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result = new MemoryStream(array2);
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}
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catch
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{
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result = null;
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}
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return result;
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}
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public override MemoryStream Compress(ref Stream data, string filename)
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{
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MemoryStream result;
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try
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{
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uint num = (uint)data.Length;
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MemoryStream memoryStream = new MemoryStream();
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byte[] array = data.ToByteArray();
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uint num2 = 0u;
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uint num3 = 16u;
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LzBufferDictionary lzBufferDictionary = new LzBufferDictionary();
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lzBufferDictionary.SetBufferSize(4096);
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lzBufferDictionary.SetBufferStart(4078);
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lzBufferDictionary.SetMaxMatchAmount(18);
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memoryStream.Write("LZ01");
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memoryStream.Write(0u);
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memoryStream.Write(num);
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memoryStream.Seek(4L, SeekOrigin.Current);
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while (num2 < num)
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{
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byte b = 0;
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uint num4 = num3;
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memoryStream.WriteByte(b);
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num3 += 1u;
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for (int i = 0; i < 8; i++)
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{
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int[] array2 = lzBufferDictionary.Search(array, num2, num);
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if (array2[1] > 0)
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{
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memoryStream.WriteByte((byte)(array2[0] & 255));
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memoryStream.WriteByte((byte)((array2[0] & 3840) >> 4 | (array2[1] - 3 & 15)));
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lzBufferDictionary.AddEntryRange(array, (int)num2, array2[1]);
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num2 += (uint)array2[1];
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num3 += 2u;
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}
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else
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{
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b |= (byte)(1 << i);
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memoryStream.WriteByte(array[(int)((uint)((UIntPtr)num2))]);
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lzBufferDictionary.AddEntry(array, (int)num2);
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num2 += 1u;
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num3 += 1u;
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}
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if (num2 >= num)
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{
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break;
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}
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}
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memoryStream.Seek((long)((ulong)num4), SeekOrigin.Begin);
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memoryStream.WriteByte(b);
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memoryStream.Seek((long)((ulong)num3), SeekOrigin.Begin);
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}
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memoryStream.Seek(4L, SeekOrigin.Begin);
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memoryStream.Write((uint)memoryStream.Length);
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memoryStream.Seek(0L, SeekOrigin.End);
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result = memoryStream;
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}
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catch
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{
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result = null;
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}
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return result;
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}
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public override bool Check(ref Stream data, string filename)
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{
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bool result;
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try
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{
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result = (data.ReadString(0L, 4) == "LZ01");
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}
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catch
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{
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result = false;
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}
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return result;
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}
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}
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}
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