RtlDecompressFragmentLZNT1

INT64 __stdcall RtlDecompressFragmentLZNT1(
        UINT8 *UncompressedFragment,
        UINT64 UncompressedFragmentSize,
        UINT8 *CompressedBuffer,
        UINT64 CompressedBufferSize){
  UINT8 *v4; 
  UINT8 *v5; 
  UINT8 *v6; 
  NTSTATUS v7; 
  __int16 v8; 
  UINT8 *v9; 
  unsigned int v10; 
  __int64 v11; 
  __int64 v12; 
  int v13; 
  unsigned int v14; 
  __int64 v15; 
  bool v16; 
  UINT8 *v18; 
  UINT64 v19; 
  int v20; 
  INT64 a6; 
  UINT8 *EndOfUncompressedBufferPlus1; 
  struct _KEVENT Event; 
  __int64 v24; 
  int v25; 
  unsigned int v26; 
  INT32 FinalUncompressedChunkSize; 
  size_t Size; 
  int v29; 
  INT64 v30; 
  __int64 v31; 
  BYTE *UncompressedBuffer; 
  v26 = UncompressedFragmentSize;
  v25 = (int)UncompressedFragment;
  v4 = CompressedBuffer;
  EndOfUncompressedBufferPlus1 = &UncompressedFragment[(unsigned int)UncompressedFragmentSize];
  v5 = UncompressedFragment;
  LODWORD(Size) = 0;
  v6 = &CompressedBuffer[(unsigned int)CompressedBufferSize];
  memset(&Event, 0, sizeof(Event));
  v7 = 0;
  KeInitializeEvent(&Event, SynchronizationEvent, 0);
  v8 = *(_WORD *)v4;
  v24 = 1i64;
  v9 = v4;
  v10 = v29;
  while( 1 )
  {
    FinalUncompressedChunkSize = 4096;
    v11 = (v8 & 0xFFFu) + 3;
    if( v10 < 0x1000 )
      break;
    v9 += v11;
    if( v9 > v6 )
      goto LABEL_41;
    v10 -= 4096;
    v4 = v9;
    if( v9 <= v6 - 2 )
    {
      v8 = *(_WORD *)v9;
      if( *(_WORD *)v9 )
        continue;
    }
    *(_DWORD *)v31 = 0;
    goto LABEL_19;
  }
  v12 = (unsigned int)v11;
  if( &v9[v11] > v6 )
  {
LABEL_41:
    v7 = -1073741246;
    *(_DWORD *)v31 = (_DWORD)v4;
    goto LABEL_19;
  }
  v13 = v30;
  v14 = v26;
  while( 1 )
  {
    v15 = 4096 - v10;
    if( (unsigned int)v15 >= v14 )
      v15 = v14;
    LODWORD(Size) = v15;
    if( v8 >= 0 )
    {
      v19 = (unsigned int)v15;
      if( &v4[v10 + 2 + v15] > v6 )
        goto LABEL_41;
      v18 = &v4[v10 + 2];
LABEL_32:
      memmove(v5, v18, v19);
      goto LABEL_13;
    }
    if( v10 || (_DWORD)v15 != 4096 )
      break;
    if( v13 )
    {
      LODWORD(a6) = v13;
      v7 = LZNT1DecompressChunkNewThread((INT64)&Event, v5, EndOfUncompressedBufferPlus1, v4 + 2, (INT64)&v4[v12], a6);
      if( v7 < 0 )
        goto LABEL_35;
      LODWORD(Size) = v13;
    }
    else
    {
      v7 = LZNT1DecompressChunk(v5, EndOfUncompressedBufferPlus1, v4 + 2, (INT64)&v4[v12], (INT32 *)&Size);
      if( v7 < 0 )
      {
LABEL_35:
        v20 = Size;
        goto LABEL_39;
      }
    }
LABEL_13:
    v10 = 0;
    v5 += (unsigned int)Size;
    v16 = v26 == (_DWORD)Size;
    v14 = v26 - Size;
    v26 -= Size;
    if( v16 )
      goto LABEL_18;
    v4 += v12;
    if( v4 > v6 - 2 )
      goto LABEL_18;
    v8 = *(_WORD *)v4;
    if( !*(_WORD *)v4 )
      goto LABEL_18;
    FinalUncompressedChunkSize = 4096;
    v12 = (v8 & 0xFFF) + 3i64;
    if( &v4[v12] > v6 )
      goto LABEL_41;
  }
  v7 = LZNT1DecompressChunk(
         UncompressedBuffer,
         UncompressedBuffer + 4096,
         v4 + 2,
         (INT64)&v4[v12],
         &FinalUncompressedChunkSize);
  if( v7 >= 0 )
  {
    v18 = &UncompressedBuffer[v10];
    if( FinalUncompressedChunkSize - v10 < (unsigned int)Size )
    {
      memmove(v5, v18, FinalUncompressedChunkSize - v10);
      LODWORD(v5) = FinalUncompressedChunkSize - v10 + (_DWORD)v5;
LABEL_18:
      *(_DWORD *)v31 = (_DWORD)v5 - v25;
      goto LABEL_19;
    }
    v19 = (unsigned int)Size;
    goto LABEL_32;
  }
  v20 = FinalUncompressedChunkSize;
LABEL_39:
  *(_DWORD *)v31 = v20;
LABEL_19:
  if( _InterlockedExchangeAdd((volatile signed __int32 *)&v24, 0xFFFFFFFF) == 1 )
    KeSetEvent(&Event, 0);
  KeWaitForSingleObject(&Event, Executive, 0, 0, 0i64);
  if( v7 >= 0 && v24 < 0 )
    return(unsigned int)HIDWORD(v24);
  return(unsigned int)v7;
}

Referenced by: