BiIssueGetDriveLayoutIoctl

NTSTATUS __stdcall BiIssueGetDriveLayoutIoctl(PVOID DeviceHandle, _DRIVE_LAYOUT_INFORMATION_EX **DriveLayout){
  LARGE_INTEGER *v4; 
  ULONG OutputBufferLength; 
  _DRIVE_LAYOUT_INFORMATION_EX *OutputBuffer; 
  _DRIVE_LAYOUT_INFORMATION_EX *v7; 
  NTSTATUS v8; 
  NTSTATUS v9; 
  ULONG v11; 
  UINT64 i; 
  LARGE_INTEGER *PoolWithTag; 
  NTSTATUS v14; 
  _DRIVE_LAYOUT_INFORMATION_EX *v15; 
  LARGE_INTEGER *v16; 
  PARTITION_INFORMATION_EX *PartitionEntry; 
  unsigned int v18; 
  LARGE_INTEGER v19; 
  struct _IO_STATUS_BLOCK IoStatusBlock; 
  v4 = 0i64;
  OutputBufferLength = 18480;
  IoStatusBlock = 0i64;
  OutputBuffer = (_DRIVE_LAYOUT_INFORMATION_EX *)ExAllocatePoolWithTag(PagedPool, 0x4830ui64, 0x4B444342ui64);
  v7 = OutputBuffer;
  if( !OutputBuffer )
    return -1073741670;
  while( 1 )
  {
    v8 = ZwDeviceIoControlFile(
           DeviceHandle,
           0i64,
           0i64,
           0i64,
           &IoStatusBlock,
           0x70050u,
           0i64,
           0,
           OutputBuffer,
           OutputBufferLength);
    v9 = v8;
    if( v8 != -1073741789 )
      break;
    ExFreePoolWithTag(v7, 0x4B444342u);
    OutputBufferLength += 9216;
    OutputBuffer = (_DRIVE_LAYOUT_INFORMATION_EX *)ExAllocatePoolWithTag(PagedPool, OutputBufferLength, 0x4B444342ui64);
    v7 = OutputBuffer;
    if( !OutputBuffer )
      goto LABEL_11;
  }
  if( v8 >= 0 )
  {
LABEL_4:
    *DriveLayout = v7;
    goto LABEL_5;
  }
  v11 = 2056;
  for( i = 2056i64; ; i = v11 )
  {
    PoolWithTag = (LARGE_INTEGER *)ExAllocatePoolWithTag(PagedPool, i, 0x4B444342ui64);
    v4 = PoolWithTag;
    if( !PoolWithTag )
    {
      v9 = -1073741670;
      goto LABEL_14;
    }
    v14 = ZwDeviceIoControlFile(DeviceHandle, 0i64, 0i64, 0i64, &IoStatusBlock, 0x7400Cu, 0i64, 0, PoolWithTag, v11);
    v9 = v14;
    if( v14 != -1073741789 )
      break;
    ExFreePoolWithTag(v4, 0x4B444342u);
    v11 += 2048;
  }
  if( v14 >= 0 )
  {
    ExFreePoolWithTag(v7, 0x4B444342u);
    v15 = (_DRIVE_LAYOUT_INFORMATION_EX *)ExAllocatePoolWithTag(PagedPool, 144 * v4->LowPart + 48, 0x4B444342ui64);
    v7 = v15;
    if( v15 )
    {
      memset((INT64)v15, 0i64);
      v7->PartitionStyle = 0;
      v16 = v4 + 1;
      PartitionEntry = v7->PartitionEntry;
      v7->PartitionCount = v4->LowPart;
      v18 = 0;
      for( v7->Mbr.Signature = v4->HighPart; v18 < v4->LowPart; PartitionEntry[-1].Mbr.HiddenSectors = v16[-2].LowPart )
      {
        PartitionEntry->PartitionStyle = PARTITION_STYLE_MBR;
        ++v18;
        v19 = *v16;
        v16 += 4;
        PartitionEntry->StartingOffset = v19;
        ++PartitionEntry;
        PartitionEntry[-1].PartitionLength = v16[-3];
        PartitionEntry[-1].PartitionNumber = v16[-2].HighPart;
        PartitionEntry[-1].RewritePartition = BYTE3(v16[-1].QuadPart);
        PartitionEntry[-1].Mbr.PartitionType = v16[-1].LowPart;
        PartitionEntry[-1].Mbr.BootIndicator = BYTE1(v16[-1].LowPart);
        PartitionEntry[-1].Mbr.RecognizedPartition = BYTE2(v16[-1].u.LowPart);
      }
      goto LABEL_4;
    }
LABEL_11:
    v9 = -1073741670;
  }
LABEL_5:
  if( v4 )
    ExFreePoolWithTag(v4, 0x4B444342u);
  if( v9 < 0 )
  {
LABEL_14:
    if( v7 )
      ExFreePoolWithTag(v7, 0x4B444342u);
  }
  return v9;
}

Referenced by: