mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-23 03:46:10 +00:00
354 lines
13 KiB
C#
354 lines
13 KiB
C#
// Decompiled with JetBrains decompiler
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// Type: SevenZip.Compression.LZMA.Decoder
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// Assembly: crypted, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
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// MVID: 316F25AB-9DC5-41B1-B1CB-0BB9D97AEA6A
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// Assembly location: C:\Users\Administrateur\Downloads\Virusshare-00000-msil\Trojan-Ransom.Win32.Gimemo.ayt-7cb020d260d835f80919399a58563918f73757689e39ba851e89cc00a05535da.exe
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using SevenZip.Compression.LZ;
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using SevenZip.Compression.RangeCoder;
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using System;
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using System.IO;
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namespace SevenZip.Compression.LZMA
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{
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public class Decoder : ICoder, ISetDecoderProperties
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{
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private OutWindow m_OutWindow = new OutWindow();
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private SevenZip.Compression.RangeCoder.Decoder m_RangeDecoder = new SevenZip.Compression.RangeCoder.Decoder();
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private BitDecoder[] m_IsMatchDecoders = new BitDecoder[new IntPtr(192)];
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private BitDecoder[] m_IsRepDecoders = new BitDecoder[new IntPtr(12)];
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private BitDecoder[] m_IsRepG0Decoders = new BitDecoder[new IntPtr(12)];
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private BitDecoder[] m_IsRepG1Decoders = new BitDecoder[new IntPtr(12)];
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private BitDecoder[] m_IsRepG2Decoders = new BitDecoder[new IntPtr(12)];
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private BitDecoder[] m_IsRep0LongDecoders = new BitDecoder[new IntPtr(192)];
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private BitTreeDecoder[] m_PosSlotDecoder = new BitTreeDecoder[new IntPtr(4)];
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private BitDecoder[] m_PosDecoders = new BitDecoder[new IntPtr(114)];
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private BitTreeDecoder m_PosAlignDecoder = new BitTreeDecoder(4);
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private Decoder.LenDecoder m_LenDecoder = new Decoder.LenDecoder();
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private Decoder.LenDecoder m_RepLenDecoder = new Decoder.LenDecoder();
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private Decoder.LiteralDecoder m_LiteralDecoder = new Decoder.LiteralDecoder();
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private uint m_DictionarySize;
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private uint m_DictionarySizeCheck;
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private uint m_PosStateMask;
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private bool _solid;
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public Decoder()
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{
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this.m_DictionarySize = uint.MaxValue;
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for (int index = 0; index < 4; ++index)
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this.m_PosSlotDecoder[index] = new BitTreeDecoder(6);
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}
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private void SetDictionarySize(uint dictionarySize)
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{
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if ((int) this.m_DictionarySize == (int) dictionarySize)
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return;
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this.m_DictionarySize = dictionarySize;
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this.m_DictionarySizeCheck = Math.Max(this.m_DictionarySize, 1U);
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this.m_OutWindow.Create(Math.Max(this.m_DictionarySizeCheck, 4096U));
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}
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private void SetLiteralProperties(int lp, int lc)
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{
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if (lp > 8)
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throw new InvalidParamException();
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if (lc > 8)
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throw new InvalidParamException();
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this.m_LiteralDecoder.Create(lp, lc);
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}
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private void SetPosBitsProperties(int pb)
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{
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if (pb > 4)
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throw new InvalidParamException();
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uint numPosStates = (uint) (1 << pb);
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this.m_LenDecoder.Create(numPosStates);
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this.m_RepLenDecoder.Create(numPosStates);
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this.m_PosStateMask = numPosStates - 1U;
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}
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private void Init(Stream inStream, Stream outStream)
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{
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this.m_RangeDecoder.Init(inStream);
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this.m_OutWindow.Init(outStream, this._solid);
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for (uint index1 = 0; index1 < 12U; ++index1)
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{
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for (uint index2 = 0; index2 <= this.m_PosStateMask; ++index2)
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{
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uint index3 = (index1 << 4) + index2;
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this.m_IsMatchDecoders[(IntPtr) index3].Init();
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this.m_IsRep0LongDecoders[(IntPtr) index3].Init();
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}
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this.m_IsRepDecoders[(IntPtr) index1].Init();
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this.m_IsRepG0Decoders[(IntPtr) index1].Init();
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this.m_IsRepG1Decoders[(IntPtr) index1].Init();
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this.m_IsRepG2Decoders[(IntPtr) index1].Init();
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}
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this.m_LiteralDecoder.Init();
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for (uint index = 0; index < 4U; ++index)
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this.m_PosSlotDecoder[(IntPtr) index].Init();
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for (uint index = 0; index < 114U; ++index)
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this.m_PosDecoders[(IntPtr) index].Init();
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this.m_LenDecoder.Init();
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this.m_RepLenDecoder.Init();
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this.m_PosAlignDecoder.Init();
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}
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public void Code(
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Stream inStream,
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Stream outStream,
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long inSize,
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long outSize,
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ICodeProgress progress)
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{
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this.Init(inStream, outStream);
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Base.State state = new Base.State();
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state.Init();
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uint distance = 0;
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uint num1 = 0;
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uint num2 = 0;
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uint num3 = 0;
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ulong pos = 0;
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ulong num4 = (ulong) outSize;
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if (pos < num4)
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{
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if (this.m_IsMatchDecoders[(IntPtr) (state.Index << 4)].Decode(this.m_RangeDecoder) != 0U)
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throw new DataErrorException();
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state.UpdateChar();
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this.m_OutWindow.PutByte(this.m_LiteralDecoder.DecodeNormal(this.m_RangeDecoder, 0U, (byte) 0));
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++pos;
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}
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while (pos < num4)
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{
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uint posState = (uint) pos & this.m_PosStateMask;
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if (this.m_IsMatchDecoders[(IntPtr) ((state.Index << 4) + posState)].Decode(this.m_RangeDecoder) == 0U)
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{
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byte prevByte = this.m_OutWindow.GetByte(0U);
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this.m_OutWindow.PutByte(state.IsCharState() ? this.m_LiteralDecoder.DecodeNormal(this.m_RangeDecoder, (uint) pos, prevByte) : this.m_LiteralDecoder.DecodeWithMatchByte(this.m_RangeDecoder, (uint) pos, prevByte, this.m_OutWindow.GetByte(distance)));
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state.UpdateChar();
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++pos;
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}
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else
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{
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uint len;
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if (this.m_IsRepDecoders[(IntPtr) state.Index].Decode(this.m_RangeDecoder) == 1U)
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{
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if (this.m_IsRepG0Decoders[(IntPtr) state.Index].Decode(this.m_RangeDecoder) == 0U)
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{
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if (this.m_IsRep0LongDecoders[(IntPtr) ((state.Index << 4) + posState)].Decode(this.m_RangeDecoder) == 0U)
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{
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state.UpdateShortRep();
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this.m_OutWindow.PutByte(this.m_OutWindow.GetByte(distance));
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++pos;
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continue;
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}
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}
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else
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{
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uint num5;
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if (this.m_IsRepG1Decoders[(IntPtr) state.Index].Decode(this.m_RangeDecoder) == 0U)
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{
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num5 = num1;
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}
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else
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{
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if (this.m_IsRepG2Decoders[(IntPtr) state.Index].Decode(this.m_RangeDecoder) == 0U)
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{
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num5 = num2;
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}
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else
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{
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num5 = num3;
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num3 = num2;
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}
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num2 = num1;
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}
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num1 = distance;
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distance = num5;
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}
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len = this.m_RepLenDecoder.Decode(this.m_RangeDecoder, posState) + 2U;
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state.UpdateRep();
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}
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else
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{
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num3 = num2;
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num2 = num1;
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num1 = distance;
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len = 2U + this.m_LenDecoder.Decode(this.m_RangeDecoder, posState);
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state.UpdateMatch();
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uint num6 = this.m_PosSlotDecoder[(IntPtr) Base.GetLenToPosState(len)].Decode(this.m_RangeDecoder);
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if (num6 >= 4U)
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{
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int NumBitLevels = (int) (num6 >> 1) - 1;
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uint num7 = (uint) ((2 | (int) num6 & 1) << NumBitLevels);
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distance = num6 >= 14U ? num7 + (this.m_RangeDecoder.DecodeDirectBits(NumBitLevels - 4) << 4) + this.m_PosAlignDecoder.ReverseDecode(this.m_RangeDecoder) : num7 + BitTreeDecoder.ReverseDecode(this.m_PosDecoders, (uint) ((int) num7 - (int) num6 - 1), this.m_RangeDecoder, NumBitLevels);
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}
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else
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distance = num6;
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}
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if ((ulong) distance >= (ulong) this.m_OutWindow.TrainSize + pos || distance >= this.m_DictionarySizeCheck)
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{
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if (distance != uint.MaxValue)
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throw new DataErrorException();
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break;
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}
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this.m_OutWindow.CopyBlock(distance, len);
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pos += (ulong) len;
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}
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}
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this.m_OutWindow.Flush();
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this.m_OutWindow.ReleaseStream();
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this.m_RangeDecoder.ReleaseStream();
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}
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public void SetDecoderProperties(byte[] properties)
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{
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if (properties.Length < 5)
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throw new InvalidParamException();
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int lc = (int) properties[0] % 9;
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int num = (int) properties[0] / 9;
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int lp = num % 5;
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int pb = num / 5;
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if (pb > 4)
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throw new InvalidParamException();
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uint dictionarySize = 0;
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for (int index = 0; index < 4; ++index)
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dictionarySize += (uint) properties[1 + index] << index * 8;
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this.SetDictionarySize(dictionarySize);
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this.SetLiteralProperties(lp, lc);
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this.SetPosBitsProperties(pb);
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}
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public bool Train(Stream stream)
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{
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this._solid = true;
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return this.m_OutWindow.Train(stream);
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}
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private class LenDecoder
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{
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private BitDecoder m_Choice = new BitDecoder();
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private BitDecoder m_Choice2 = new BitDecoder();
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private BitTreeDecoder[] m_LowCoder = new BitTreeDecoder[new IntPtr(16)];
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private BitTreeDecoder[] m_MidCoder = new BitTreeDecoder[new IntPtr(16)];
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private BitTreeDecoder m_HighCoder = new BitTreeDecoder(8);
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private uint m_NumPosStates;
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public void Create(uint numPosStates)
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{
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for (uint numPosStates1 = this.m_NumPosStates; numPosStates1 < numPosStates; ++numPosStates1)
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{
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this.m_LowCoder[(IntPtr) numPosStates1] = new BitTreeDecoder(3);
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this.m_MidCoder[(IntPtr) numPosStates1] = new BitTreeDecoder(3);
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}
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this.m_NumPosStates = numPosStates;
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}
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public void Init()
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{
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this.m_Choice.Init();
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for (uint index = 0; index < this.m_NumPosStates; ++index)
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{
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this.m_LowCoder[(IntPtr) index].Init();
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this.m_MidCoder[(IntPtr) index].Init();
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}
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this.m_Choice2.Init();
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this.m_HighCoder.Init();
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}
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public uint Decode(SevenZip.Compression.RangeCoder.Decoder rangeDecoder, uint posState)
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{
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if (this.m_Choice.Decode(rangeDecoder) == 0U)
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return this.m_LowCoder[(IntPtr) posState].Decode(rangeDecoder);
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uint num = 8;
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return this.m_Choice2.Decode(rangeDecoder) != 0U ? num + 8U + this.m_HighCoder.Decode(rangeDecoder) : num + this.m_MidCoder[(IntPtr) posState].Decode(rangeDecoder);
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}
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}
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private class LiteralDecoder
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{
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private Decoder.LiteralDecoder.Decoder2[] m_Coders;
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private int m_NumPrevBits;
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private int m_NumPosBits;
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private uint m_PosMask;
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public void Create(int numPosBits, int numPrevBits)
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{
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if (this.m_Coders != null && this.m_NumPrevBits == numPrevBits && this.m_NumPosBits == numPosBits)
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return;
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this.m_NumPosBits = numPosBits;
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this.m_PosMask = (uint) ((1 << numPosBits) - 1);
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this.m_NumPrevBits = numPrevBits;
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uint length = (uint) (1 << this.m_NumPrevBits + this.m_NumPosBits);
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this.m_Coders = new Decoder.LiteralDecoder.Decoder2[(IntPtr) length];
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for (uint index = 0; index < length; ++index)
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this.m_Coders[(IntPtr) index].Create();
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}
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public void Init()
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{
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uint num = (uint) (1 << this.m_NumPrevBits + this.m_NumPosBits);
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for (uint index = 0; index < num; ++index)
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this.m_Coders[(IntPtr) index].Init();
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}
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private uint GetState(uint pos, byte prevByte) => (uint) ((((int) pos & (int) this.m_PosMask) << this.m_NumPrevBits) + ((int) prevByte >> 8 - this.m_NumPrevBits));
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public byte DecodeNormal(SevenZip.Compression.RangeCoder.Decoder rangeDecoder, uint pos, byte prevByte) => this.m_Coders[(IntPtr) this.GetState(pos, prevByte)].DecodeNormal(rangeDecoder);
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public byte DecodeWithMatchByte(
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SevenZip.Compression.RangeCoder.Decoder rangeDecoder,
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uint pos,
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byte prevByte,
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byte matchByte)
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{
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return this.m_Coders[(IntPtr) this.GetState(pos, prevByte)].DecodeWithMatchByte(rangeDecoder, matchByte);
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}
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private struct Decoder2
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{
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private BitDecoder[] m_Decoders;
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public void Create() => this.m_Decoders = new BitDecoder[768];
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public void Init()
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{
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for (int index = 0; index < 768; ++index)
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this.m_Decoders[index].Init();
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}
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public byte DecodeNormal(SevenZip.Compression.RangeCoder.Decoder rangeDecoder)
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{
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uint index = 1;
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do
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{
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index = index << 1 | this.m_Decoders[(IntPtr) index].Decode(rangeDecoder);
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}
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while (index < 256U);
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return (byte) index;
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}
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public byte DecodeWithMatchByte(SevenZip.Compression.RangeCoder.Decoder rangeDecoder, byte matchByte)
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{
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uint index = 1;
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do
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{
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uint num1 = (uint) ((int) matchByte >> 7 & 1);
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matchByte <<= 1;
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uint num2 = this.m_Decoders[(IntPtr) ((uint) (1 + (int) num1 << 8) + index)].Decode(rangeDecoder);
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index = index << 1 | num2;
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if ((int) num1 != (int) num2)
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{
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while (index < 256U)
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index = index << 1 | this.m_Decoders[(IntPtr) index].Decode(rangeDecoder);
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break;
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}
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}
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while (index < 256U);
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return (byte) index;
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}
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}
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}
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}
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}
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