121 lines
3.2 KiB
C#
121 lines
3.2 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 CXLZ : CompressionModule
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{
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public override string Name
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{
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get { return "CXLZ"; }
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}
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protected override void DecompressInternal(Stream inputStream, Stream outputStream, int inputLength, int outputLength)
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{
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uint num = (uint)inputStream.Length;
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uint num2 = inputStream.ReadUInt(4L) >> 8;
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uint num3 = 8u;
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byte[] array = inputStream.ToByteArray();
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while (num3 < num && outputStream.Position < 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 = 7; i >= 0; i--)
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{
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if (((int)b & 1 << i) == 0)
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{
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outputStream.Write(array[(int)((uint)((UIntPtr)num3))]);
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num3 += 1u;
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}
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else
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{
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int num5 = ((int)(array[(int)((uint)((UIntPtr)num3))] & 15) << 8 | (int)array[(int)((uint)((UIntPtr)(num3 + 1u)))]) + 1;
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int num6 = (array[(int)((uint)((UIntPtr)num3))] >> 4) + 3;
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num3 += 2u;
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for (int j = 0; j < num6; j++)
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{
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long pos = inputStream.Position;
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inputStream.Position = (inputStream.Position - num5 + j);
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outputStream.WriteByte((byte)inputStream.ReadByte());
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inputStream.Position = pos;
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}
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}
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if (num3 >= num || outputStream.Position >= 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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}
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protected override void CompressInternal(Stream inputStream, Stream outputStream)
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{
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uint num = (uint)inputStream.Length;
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if (inputStream.Length > 16777215L) throw new Exception("Input file is too large to compress.");
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byte[] array = inputStream.ToByteArray();
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uint num2 = 0u;
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uint num3 = 8u;
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LzWindowDictionary lzWindowDictionary = new LzWindowDictionary();
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lzWindowDictionary.SetWindowSize(4096);
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lzWindowDictionary.SetMaxMatchAmount(18);
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outputStream.Write("CXLZ");
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outputStream.Write(16u | num << 8);
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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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outputStream.WriteByte(b);
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num3 += 1u;
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for (int i = 7; i >= 0; i--)
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{
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int[] array2 = lzWindowDictionary.Search(array, num2, num);
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if (array2[1] > 0)
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{
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b |= (byte)(1 << i);
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outputStream.WriteByte((byte)((array2[1] - 3 & 15) << 4 | (array2[0] - 1 & 4095) >> 8));
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outputStream.WriteByte((byte)(array2[0] - 1 & 255));
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lzWindowDictionary.AddEntryRange(array, (int)num2, array2[1]);
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lzWindowDictionary.SlideWindow(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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outputStream.WriteByte(array[(int)((uint)((UIntPtr)num2))]);
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lzWindowDictionary.AddEntry(array, (int)num2);
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lzWindowDictionary.SlideWindow(1);
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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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outputStream.Seek((long)((ulong)num4), SeekOrigin.Begin);
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outputStream.WriteByte(b);
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outputStream.Seek((long)((ulong)num3), SeekOrigin.Begin);
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}
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}
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public bool Check(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, 5) == "CXLZ\u0010");
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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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