mirror of
https://github.com/WiiDatabase/nusdownloader.git
synced 2024-12-27 11:01:52 +01:00
364 lines
11 KiB
C#
364 lines
11 KiB
C#
// Decompiled with JetBrains decompiler
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// Type: libWiiSharp.Lz77
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// Assembly: NUS Downloader, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
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// MVID: DDAF9FEC-76DE-4BD8-8A6D-D7CAD5827AC6
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// Assembly location: C:\dotpeek\NUS Downloader.exe
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using System;
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using System.IO;
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namespace libWiiSharp
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{
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public class Lz77
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{
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private const int N = 4096;
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private const int F = 18;
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private const int threshold = 2;
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private static uint lz77Magic = 1280980791;
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private int[] leftSon = new int[4097];
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private int[] rightSon = new int[4353];
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private int[] dad = new int[4097];
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private ushort[] textBuffer = new ushort[4113];
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private int matchPosition;
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private int matchLength;
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public static uint Lz77Magic => Lz77.lz77Magic;
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public static bool IsLz77Compressed(string file) => Lz77.IsLz77Compressed(File.ReadAllBytes(file));
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public static bool IsLz77Compressed(byte[] file)
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{
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Headers.HeaderType startIndex = Headers.DetectHeader(file);
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return (int) Shared.Swap(BitConverter.ToUInt32(file, (int) startIndex)) == (int) Lz77.lz77Magic;
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}
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public static bool IsLz77Compressed(Stream file)
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{
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Headers.HeaderType offset = Headers.DetectHeader(file);
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byte[] buffer = new byte[4];
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file.Seek((long) offset, SeekOrigin.Begin);
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file.Read(buffer, 0, buffer.Length);
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return (int) Shared.Swap(BitConverter.ToUInt32(buffer, 0)) == (int) Lz77.lz77Magic;
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}
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public void Compress(string inFile, string outFile)
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{
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Stream stream;
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using (FileStream inFile1 = new FileStream(inFile, FileMode.Open))
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stream = this.compress((Stream) inFile1);
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byte[] buffer = new byte[stream.Length];
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stream.Read(buffer, 0, buffer.Length);
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if (File.Exists(outFile))
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File.Delete(outFile);
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using (FileStream fileStream = new FileStream(outFile, FileMode.Create))
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fileStream.Write(buffer, 0, buffer.Length);
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}
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public byte[] Compress(byte[] file) => ((MemoryStream) this.compress((Stream) new MemoryStream(file))).ToArray();
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public Stream Compress(Stream file) => this.compress(file);
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public void Decompress(string inFile, string outFile)
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{
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Stream stream;
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using (FileStream inFile1 = new FileStream(inFile, FileMode.Open))
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stream = this.decompress((Stream) inFile1);
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byte[] buffer = new byte[stream.Length];
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stream.Read(buffer, 0, buffer.Length);
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if (File.Exists(outFile))
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File.Delete(outFile);
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using (FileStream fileStream = new FileStream(outFile, FileMode.Create))
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fileStream.Write(buffer, 0, buffer.Length);
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}
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public byte[] Decompress(byte[] file) => ((MemoryStream) this.decompress((Stream) new MemoryStream(file))).ToArray();
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public Stream Decompress(Stream file) => this.decompress(file);
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private Stream decompress(Stream inFile)
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{
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if (!Lz77.IsLz77Compressed(inFile))
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return inFile;
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inFile.Seek(0L, SeekOrigin.Begin);
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uint num1 = 0;
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Headers.HeaderType offset = Headers.DetectHeader(inFile);
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byte[] buffer = new byte[8];
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inFile.Seek((long) offset, SeekOrigin.Begin);
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inFile.Read(buffer, 0, 8);
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if ((int) Shared.Swap(BitConverter.ToUInt32(buffer, 0)) != (int) Lz77.lz77Magic)
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{
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inFile.Dispose();
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throw new Exception("Invaild Magic!");
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}
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if (buffer[4] != (byte) 16)
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{
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inFile.Dispose();
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throw new Exception("Unsupported Compression Type!");
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}
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uint num2 = BitConverter.ToUInt32(buffer, 4) >> 8;
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for (int index = 0; index < 4078; ++index)
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this.textBuffer[index] = (ushort) 223;
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int num3 = 4078;
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uint num4 = 7;
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int num5 = 7;
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MemoryStream memoryStream = new MemoryStream();
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label_10:
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while (true)
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{
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num4 <<= 1;
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++num5;
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if (num5 == 8)
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{
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int num6;
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if ((num6 = inFile.ReadByte()) != -1)
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{
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num4 = (uint) num6;
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num5 = 0;
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}
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else
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goto label_24;
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}
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if (((int) num4 & 128) == 0)
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{
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int num7;
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if ((long) (num7 = inFile.ReadByte()) != inFile.Length - 1L)
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{
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if (num1 < num2)
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memoryStream.WriteByte((byte) num7);
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ushort[] textBuffer = this.textBuffer;
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int index = num3;
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int num8 = index + 1;
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int num9 = (int) (byte) num7;
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textBuffer[index] = (ushort) num9;
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num3 = num8 & 4095;
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++num1;
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}
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else
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goto label_24;
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}
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else
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break;
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}
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int num10;
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int num11;
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if ((num10 = inFile.ReadByte()) != -1 && (num11 = inFile.ReadByte()) != -1)
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{
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int num12 = num11 | num10 << 8 & 3840;
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int num13 = (num10 >> 4 & 15) + 2;
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for (int index1 = 0; index1 <= num13; ++index1)
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{
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int num14 = (int) this.textBuffer[num3 - num12 - 1 & 4095];
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if (num1 < num2)
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memoryStream.WriteByte((byte) num14);
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ushort[] textBuffer = this.textBuffer;
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int index2 = num3;
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int num15 = index2 + 1;
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int num16 = (int) (byte) num14;
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textBuffer[index2] = (ushort) num16;
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num3 = num15 & 4095;
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++num1;
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}
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goto label_10;
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}
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label_24:
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return (Stream) memoryStream;
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}
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private Stream compress(Stream inFile)
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{
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if (Lz77.IsLz77Compressed(inFile))
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return inFile;
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inFile.Seek(0L, SeekOrigin.Begin);
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int num1 = 0;
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int[] numArray1 = new int[17];
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uint num2 = (uint) (((int) Convert.ToUInt32(inFile.Length) << 8) + 16);
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MemoryStream memoryStream = new MemoryStream();
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memoryStream.Write(BitConverter.GetBytes(Shared.Swap(Lz77.lz77Magic)), 0, 4);
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memoryStream.Write(BitConverter.GetBytes(num2), 0, 4);
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this.InitTree();
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numArray1[0] = 0;
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int num3 = 1;
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int num4 = 128;
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int p = 0;
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int r = 4078;
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for (int index = p; index < r; ++index)
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this.textBuffer[index] = ushort.MaxValue;
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int num5;
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int num6;
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for (num5 = 0; num5 < 18 && (num6 = inFile.ReadByte()) != -1; ++num5)
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this.textBuffer[r + num5] = (ushort) num6;
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if (num5 == 0)
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return inFile;
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for (int index = 1; index <= 18; ++index)
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this.InsertNode(r - index);
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this.InsertNode(r);
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do
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{
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if (this.matchLength > num5)
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this.matchLength = num5;
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if (this.matchLength <= 2)
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{
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this.matchLength = 1;
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numArray1[num3++] = (int) this.textBuffer[r];
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}
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else
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{
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numArray1[0] |= num4;
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int[] numArray2 = numArray1;
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int index1 = num3;
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int num7 = index1 + 1;
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int num8 = (int) (ushort) (r - this.matchPosition - 1 >> 8 & 15) | this.matchLength - 3 << 4;
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numArray2[index1] = num8;
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int[] numArray3 = numArray1;
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int index2 = num7;
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num3 = index2 + 1;
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int num9 = (int) (ushort) (r - this.matchPosition - 1 & (int) byte.MaxValue);
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numArray3[index2] = num9;
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}
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if ((num4 >>= 1) == 0)
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{
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for (int index = 0; index < num3; ++index)
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memoryStream.WriteByte((byte) numArray1[index]);
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num1 += num3;
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numArray1[0] = 0;
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num3 = 1;
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num4 = 128;
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}
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int matchLength = this.matchLength;
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int num10;
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int num11;
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for (num10 = 0; num10 < matchLength && (num11 = inFile.ReadByte()) != -1; ++num10)
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{
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this.DeleteNode(p);
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this.textBuffer[p] = (ushort) num11;
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if (p < 17)
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this.textBuffer[p + 4096] = (ushort) num11;
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p = p + 1 & 4095;
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r = r + 1 & 4095;
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this.InsertNode(r);
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}
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while (num10++ < matchLength)
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{
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this.DeleteNode(p);
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p = p + 1 & 4095;
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r = r + 1 & 4095;
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if (--num5 != 0)
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this.InsertNode(r);
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}
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}
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while (num5 > 0);
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if (num3 > 1)
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{
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for (int index = 0; index < num3; ++index)
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memoryStream.WriteByte((byte) numArray1[index]);
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num1 += num3;
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}
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if (num1 % 4 != 0)
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{
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for (int index = 0; index < 4 - num1 % 4; ++index)
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memoryStream.WriteByte((byte) 0);
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}
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return (Stream) memoryStream;
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}
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private void InitTree()
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{
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for (int index = 4097; index <= 4352; ++index)
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this.rightSon[index] = 4096;
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for (int index = 0; index < 4096; ++index)
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this.dad[index] = 4096;
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}
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private void InsertNode(int r)
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{
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int num1 = 1;
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int index = 4097 + (this.textBuffer[r] == ushort.MaxValue ? 0 : (int) this.textBuffer[r]);
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this.rightSon[r] = this.leftSon[r] = 4096;
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this.matchLength = 0;
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int num2;
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do
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{
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do
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{
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if (num1 >= 0)
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{
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if (this.rightSon[index] != 4096)
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{
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index = this.rightSon[index];
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}
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else
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{
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this.rightSon[index] = r;
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this.dad[r] = index;
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return;
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}
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}
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else if (this.leftSon[index] != 4096)
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{
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index = this.leftSon[index];
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}
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else
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{
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this.leftSon[index] = r;
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this.dad[r] = index;
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return;
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}
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num2 = 1;
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while (num2 < 18 && (num1 = (int) this.textBuffer[r + num2] - (int) this.textBuffer[index + num2]) == 0)
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++num2;
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}
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while (num2 <= this.matchLength);
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this.matchPosition = index;
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}
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while ((this.matchLength = num2) < 18);
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this.dad[r] = this.dad[index];
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this.leftSon[r] = this.leftSon[index];
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this.rightSon[r] = this.rightSon[index];
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this.dad[this.leftSon[index]] = r;
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this.dad[this.rightSon[index]] = r;
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if (this.rightSon[this.dad[index]] == index)
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this.rightSon[this.dad[index]] = r;
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else
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this.leftSon[this.dad[index]] = r;
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this.dad[index] = 4096;
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}
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private void DeleteNode(int p)
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{
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if (this.dad[p] == 4096)
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return;
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int index;
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if (this.rightSon[p] == 4096)
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index = this.leftSon[p];
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else if (this.leftSon[p] == 4096)
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{
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index = this.rightSon[p];
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}
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else
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{
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index = this.leftSon[p];
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if (this.rightSon[index] != 4096)
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{
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do
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{
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index = this.rightSon[index];
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}
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while (this.rightSon[index] != 4096);
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this.rightSon[this.dad[index]] = this.leftSon[index];
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this.dad[this.leftSon[index]] = this.dad[index];
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this.leftSon[index] = this.leftSon[p];
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this.dad[this.leftSon[p]] = index;
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}
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this.rightSon[index] = this.rightSon[p];
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this.dad[this.rightSon[p]] = index;
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}
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this.dad[index] = this.dad[p];
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if (this.rightSon[this.dad[p]] == p)
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this.rightSon[this.dad[p]] = index;
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else
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this.leftSon[this.dad[p]] = index;
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this.dad[p] = 4096;
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}
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}
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}
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