MalwareSourceCode/MSIL/Trojan-Ransom/Win32/G/Trojan-Ransom.Win32.Gimemo.ayt-624a52079bf1703bcd3bcc9d2d3716b6126fd05655e25289d19142f9aae02eb5/Compression/RangeCoder/BitTreeDecoder.cs

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2022-08-18 11:28:56 +00:00
// Decompiled with JetBrains decompiler
// Type: SevenZip.Compression.RangeCoder.BitTreeDecoder
// Assembly: P4CTEMP, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
// MVID: 7BE4E538-8555-4C2E-974B-99E556F5462C
// Assembly location: C:\Users\Administrateur\Downloads\Virusshare-00000-msil\Trojan-Ransom.Win32.Gimemo.ayt-624a52079bf1703bcd3bcc9d2d3716b6126fd05655e25289d19142f9aae02eb5.exe
using System;
namespace SevenZip.Compression.RangeCoder
{
internal struct BitTreeDecoder
{
private BitDecoder[] Models;
private int NumBitLevels;
public BitTreeDecoder(int numBitLevels)
{
this.NumBitLevels = numBitLevels;
this.Models = new BitDecoder[1 << numBitLevels];
}
public void Init()
{
for (uint index = 1; (long) index < (long) (1 << this.NumBitLevels); ++index)
this.Models[(IntPtr) index].Init();
}
public uint Decode(Decoder rangeDecoder)
{
uint index = 1;
for (int numBitLevels = this.NumBitLevels; numBitLevels > 0; --numBitLevels)
index = (index << 1) + this.Models[(IntPtr) index].Decode(rangeDecoder);
return index - (uint) (1 << this.NumBitLevels);
}
public uint ReverseDecode(Decoder rangeDecoder)
{
uint index1 = 1;
uint num1 = 0;
for (int index2 = 0; index2 < this.NumBitLevels; ++index2)
{
uint num2 = this.Models[(IntPtr) index1].Decode(rangeDecoder);
index1 = (index1 << 1) + num2;
num1 |= num2 << index2;
}
return num1;
}
public static uint ReverseDecode(
BitDecoder[] Models,
uint startIndex,
Decoder rangeDecoder,
int NumBitLevels)
{
uint num1 = 1;
uint num2 = 0;
for (int index = 0; index < NumBitLevels; ++index)
{
uint num3 = Models[(IntPtr) (startIndex + num1)].Decode(rangeDecoder);
num1 = (num1 << 1) + num3;
num2 |= num3 << index;
}
return num2;
}
}
}