srbhelper.h

Go to the documentation of this file.

#ifndef _SRBHELPER_H_
#define _SRBHELPER_H_

#if !defined(_NTSTORPORT_) && !defined(_NTSTORPORTP_) && !defined(_NTSRB_)
#include <scsi.h>
#include <srb.h>
#endif

#if (NTDDI_VERSION >= NTDDI_WIN8)

#if !defined(SRBHELPER_ASSERT)
#define SRBHELPER_ASSERT NT_ASSERT
#endif

#if !defined(SRB_ALIGN_SIZEOF)
#define SRB_ALIGN_SIZEOF(x) (((ULONG_PTR)(sizeof(x) + sizeof(PVOID) - 1)) & ~(sizeof(PVOID) - 1))
#endif

#if defined(_NTSTORPORT_) || defined(_NTSTORPORTP_)
#define SrbMoveMemory(Destination, Source, Length) StorPortMoveMemory(Destination, Source, Length)
#elif defined(_NTDDK_)
#define SrbMoveMemory(Destination, Source, Length) RtlMoveMemory(Destination, Source, Length)
#else
#define SrbMoveMemory(Destination, Source, Length) memmove(Destination, Source, Length)
#endif

#if defined(_NTDDK_)
#define SrbCopyMemory(Destination, Source, Length) RtlCopyMemory(Destination, Source, Length)
#else
#define SrbCopyMemory(Destination, Source, Length) memcpy(Destination, Source, Length)
#endif

#if defined(_NTDDK_)
#define SrbZeroMemory(Destination, Length) RtlZeroMemory(Destination, Length)
#else
#define SrbZeroMemory(Destination, Length) memset(Destination, 0, Length)
#endif

#if defined(_NTDDK_)
#define SrbEqualMemory(Source1, Source2, Length) RtlEqualMemory(Source1, Source2, Length)
#else
#define SrbEqualMemory(Source1, Source2, Length) (memcmp(Source1, Source2, Length) == 0)
#endif

FORCEINLINE
PSRBEX_DATA
SrbGetSrbExDataByIndex(
  _In_ PSTORAGE_REQUEST_BLOCK Srb,
  _In_ ULONG SrbExDataIndex)
{
  PSRBEX_DATA srbExData = NULL;

  if ((Srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK) &&
      (SrbExDataIndex < Srb->NumSrbExData) && (Srb->SrbExDataOffset[SrbExDataIndex]) &&
      (Srb->SrbExDataOffset[SrbExDataIndex] >= sizeof(STORAGE_REQUEST_BLOCK)) &&
      (Srb->SrbExDataOffset[SrbExDataIndex] < Srb->SrbLength))
  {
    srbExData = (PSRBEX_DATA)((PUCHAR)Srb + Srb->SrbExDataOffset[SrbExDataIndex]);
  }

  return srbExData;
}

FORCEINLINE
PSRBEX_DATA
SrbGetSrbExDataByType(
  _In_ PSTORAGE_REQUEST_BLOCK Srb,
  _In_ SRBEXDATATYPE Type)
{
  if ((Srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK) && (Srb->NumSrbExData > 0))
  {
    PSRBEX_DATA srbExData = NULL;
    UCHAR i = 0;

    for (i = 0; i < Srb->NumSrbExData; i++)
    {
      if (Srb->SrbExDataOffset[i] >= sizeof(STORAGE_REQUEST_BLOCK) &&
          Srb->SrbExDataOffset[i] < Srb->SrbLength)
      {
        srbExData = (PSRBEX_DATA)((PUCHAR)Srb + Srb->SrbExDataOffset[i]);
        if (srbExData->Type == Type)
        {
          return srbExData;
        }
      }
    }
  }

  return NULL;
}

FORCEINLINE
PSRBEX_DATA
SrbGetPrimarySrbExData(
  _In_ PSTORAGE_REQUEST_BLOCK Srb)
{
  if (Srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    switch (Srb->SrbFunction)
    {
    case SRB_FUNCTION_POWER:
      return SrbGetSrbExDataByType(Srb, SrbExDataTypePower);

    case SRB_FUNCTION_PNP:
      return SrbGetSrbExDataByType(Srb, SrbExDataTypePnP);

    case SRB_FUNCTION_WMI:
      return SrbGetSrbExDataByType(Srb, SrbExDataTypeWmi);

    case SRB_FUNCTION_EXECUTE_SCSI: {
      PSRBEX_DATA srbExData = NULL;
      UCHAR i = 0;

      for (i = 0; i < Srb->NumSrbExData; i++)
      {
        if (Srb->SrbExDataOffset[i] >= sizeof(STORAGE_REQUEST_BLOCK) &&
            Srb->SrbExDataOffset[i] < Srb->SrbLength)
        {
          srbExData = (PSRBEX_DATA)((PUCHAR)Srb + Srb->SrbExDataOffset[i]);
          if (srbExData->Type == SrbExDataTypeScsiCdb16 ||
              srbExData->Type == SrbExDataTypeScsiCdb32 ||
              srbExData->Type == SrbExDataTypeScsiCdbVar)
          {
            return srbExData;
          }
        }
      }
      return NULL;
    }

    default:
      return NULL;
    }
  }

  return NULL;
}

FORCEINLINE PSTOR_ADDRESS SrbGetAddress(_In_ PSTORAGE_REQUEST_BLOCK Srb)
{
  PSTOR_ADDRESS storAddr = NULL;

  if (Srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SRBHELPER_ASSERT(Srb->AddressOffset);

    if (Srb->AddressOffset)
    {
      storAddr = (PSTOR_ADDRESS)((PUCHAR)Srb + Srb->AddressOffset);
      SRBHELPER_ASSERT(storAddr->Type == STOR_ADDRESS_TYPE_BTL8);
    }
  }

  return storAddr;
}

FORCEINLINE
BOOLEAN
SrbCopySrb(
  _In_ PVOID DestinationSrb,
  _In_ ULONG DestinationSrbLength,
  _In_ PVOID SourceSrb)
{
  PSTORAGE_REQUEST_BLOCK sourceSrb = (PSTORAGE_REQUEST_BLOCK)SourceSrb;
  BOOLEAN status = FALSE;

  if (sourceSrb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    if (DestinationSrbLength >= sourceSrb->SrbLength)
    {
      SrbCopyMemory(DestinationSrb, SourceSrb, sourceSrb->SrbLength);
      status = TRUE;
    }
  }
  else
  {
    if (DestinationSrbLength >= SCSI_REQUEST_BLOCK_SIZE)
    {
      SrbCopyMemory(DestinationSrb, SourceSrb, SCSI_REQUEST_BLOCK_SIZE);
      status = TRUE;
    }
  }

  return status;
}

FORCEINLINE
VOID
SrbZeroSrb(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR function = srb->Function;
  USHORT length = srb->Length;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    ULONG srbLength = srb->SrbLength;

    SrbZeroMemory(Srb, srb->SrbLength);

    srb->SrbLength = srbLength;
  }
  else
  {
    SrbZeroMemory(Srb, sizeof(SCSI_REQUEST_BLOCK));
  }

  srb->Function = function;
  srb->Length = length;
}

FORCEINLINE
ULONG
SrbGetSrbLength(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->SrbLength;
  }
  else
  {
    return sizeof(SCSI_REQUEST_BLOCK);
  }
}

FORCEINLINE
VOID
SrbSetSrbLength(
  _In_ PVOID Srb,
  _In_ ULONG Length)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->SrbLength = Length;
  }
}

FORCEINLINE
ULONG
SrbGetDefaultSrbLengthFromFunction(
  _In_ ULONG SrbFunction)
{
  switch (SrbFunction)
  {
  case SRB_FUNCTION_PNP:
    return SRB_ALIGN_SIZEOF(STORAGE_REQUEST_BLOCK) + SRB_ALIGN_SIZEOF(STOR_ADDR_BTL8) +
           SRB_ALIGN_SIZEOF(SRBEX_DATA_PNP);
  case SRB_FUNCTION_POWER:
    return SRB_ALIGN_SIZEOF(STORAGE_REQUEST_BLOCK) + SRB_ALIGN_SIZEOF(STOR_ADDR_BTL8) +
           SRB_ALIGN_SIZEOF(SRBEX_DATA_POWER);
  case SRB_FUNCTION_WMI:
    return SRB_ALIGN_SIZEOF(STORAGE_REQUEST_BLOCK) + SRB_ALIGN_SIZEOF(STOR_ADDR_BTL8) +
           SRB_ALIGN_SIZEOF(SRBEX_DATA_WMI);
  case SRB_FUNCTION_EXECUTE_SCSI:
    return SRB_ALIGN_SIZEOF(STORAGE_REQUEST_BLOCK) + SRB_ALIGN_SIZEOF(STOR_ADDR_BTL8) +
           SRB_ALIGN_SIZEOF(SRBEX_DATA_SCSI_CDB16);
  case SRB_FUNCTION_IO_CONTROL:
    return SRB_ALIGN_SIZEOF(STORAGE_REQUEST_BLOCK) + SRB_ALIGN_SIZEOF(STOR_ADDR_BTL8);
  default:
    return SRB_ALIGN_SIZEOF(STORAGE_REQUEST_BLOCK) + SRB_ALIGN_SIZEOF(STOR_ADDR_BTL8);
  }
}

FORCEINLINE
PCDB
SrbGetScsiData(
  _In_ PSTORAGE_REQUEST_BLOCK SrbEx,
  _In_opt_ PUCHAR CdbLength8,
  _In_opt_ PULONG CdbLength32,
  _In_opt_ PUCHAR ScsiStatus,
  _In_opt_ PVOID *SenseInfoBuffer,
  _In_opt_ PUCHAR SenseInfoBufferLength)
{
  PCDB Cdb = NULL;
  ULONG i;
  PSRBEX_DATA SrbExData = NULL;
  BOOLEAN FoundEntry = FALSE;

  if ((SrbEx->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK) &&
      (SrbEx->SrbFunction == SRB_FUNCTION_EXECUTE_SCSI))
  {
    SRBHELPER_ASSERT(SrbEx->NumSrbExData > 0);

    for (i = 0; i < SrbEx->NumSrbExData; i++)
    {
      if ((SrbEx->SrbExDataOffset[i] < sizeof(STORAGE_REQUEST_BLOCK)) ||
          (SrbEx->SrbExDataOffset[i] >= SrbEx->SrbLength))
      {
        SRBHELPER_ASSERT(FALSE);
        continue;
      }

      SrbExData = (PSRBEX_DATA)((PUCHAR)SrbEx + SrbEx->SrbExDataOffset[i]);

      switch (SrbExData->Type)
      {
          case SrbExDataTypeScsiCdb16:
            if (SrbEx->SrbExDataOffset[i] + sizeof(SRBEX_DATA_SCSI_CDB16) <= SrbEx->SrbLength)
            {
              FoundEntry = TRUE;
              if (CdbLength8)
              {
                *CdbLength8 = ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->CdbLength;
              }

              if (((PSRBEX_DATA_SCSI_CDB16)SrbExData)->CdbLength > 0)
              {
                Cdb = (PCDB)((PSRBEX_DATA_SCSI_CDB16)SrbExData)->Cdb;
              }

              if (ScsiStatus)
              {
                *ScsiStatus = ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->ScsiStatus;
              }

              if (SenseInfoBuffer)
              {
                *SenseInfoBuffer = ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->SenseInfoBuffer;
              }

              if (SenseInfoBufferLength)
              {
                *SenseInfoBufferLength = ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->SenseInfoBufferLength;
              }
            }
            else
            {
              // Catch invalid offset
              SRBHELPER_ASSERT(FALSE);
            }
            break;

          case SrbExDataTypeScsiCdb32:
            if (SrbEx->SrbExDataOffset[i] + sizeof(SRBEX_DATA_SCSI_CDB32) <= SrbEx->SrbLength)
            {
              FoundEntry = TRUE;
              if (CdbLength8)
              {
                *CdbLength8 = ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->CdbLength;
              }

              if (((PSRBEX_DATA_SCSI_CDB32)SrbExData)->CdbLength > 0)
              {
                Cdb = (PCDB)((PSRBEX_DATA_SCSI_CDB32)SrbExData)->Cdb;
              }

              if (ScsiStatus)
              {
                *ScsiStatus = ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->ScsiStatus;
              }

              if (SenseInfoBuffer)
              {
                *SenseInfoBuffer = ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->SenseInfoBuffer;
              }

              if (SenseInfoBufferLength)
              {
                *SenseInfoBufferLength = ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->SenseInfoBufferLength;
              }
            }
            else
            {
              // Catch invalid offset
              SRBHELPER_ASSERT(FALSE);
            }
            break;

          case SrbExDataTypeScsiCdbVar:
            if (SrbEx->SrbExDataOffset[i] + sizeof(SRBEX_DATA_SCSI_CDB_VAR) <= SrbEx->SrbLength)
            {
              FoundEntry = TRUE;
              if (CdbLength32)
              {
                *CdbLength32 = ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->CdbLength;
              }

              if (((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->CdbLength > 0)
              {
                Cdb = (PCDB)((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->Cdb;
              }

              if (ScsiStatus)
              {
                *ScsiStatus = ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->ScsiStatus;
              }

              if (SenseInfoBuffer)
              {
                *SenseInfoBuffer = ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->SenseInfoBuffer;
              }

              if (SenseInfoBufferLength)
              {
                *SenseInfoBufferLength = ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->SenseInfoBufferLength;
              }
            }
            else
            {
              SRBHELPER_ASSERT(FALSE);
            }
            break;
      }

      if (FoundEntry)
      {
        break;
      }
    }
  }
  else
  {

    if (CdbLength8)
    {
      *CdbLength8 = 0;
    }

    if (CdbLength32)
    {
      *CdbLength32 = 0;
    }

    if (ScsiStatus)
    {
      *ScsiStatus = SCSISTAT_GOOD;
    }

    if (SenseInfoBuffer)
    {
      *SenseInfoBuffer = NULL;
    }

    if (SenseInfoBufferLength)
    {
      *SenseInfoBufferLength = 0;
    }
  }

  return Cdb;
}

FORCEINLINE
VOID
SrbSetScsiData(
  _In_ PSTORAGE_REQUEST_BLOCK SrbEx,
  _In_opt_ PUCHAR CdbLength8,
  _In_opt_ PULONG CdbLength32,
  _In_opt_ PUCHAR ScsiStatus,
  _In_opt_ PVOID *SenseInfoBuffer,
  _In_opt_ PUCHAR SenseInfoBufferLength)
{
  ULONG i;
  PSRBEX_DATA SrbExData = NULL;
  BOOLEAN FoundEntry = FALSE;

  if ((SrbEx->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK) &&
      (SrbEx->SrbFunction == SRB_FUNCTION_EXECUTE_SCSI))
  {
    SRBHELPER_ASSERT(SrbEx->NumSrbExData > 0);

    for (i = 0; i < SrbEx->NumSrbExData; i++)
    {
      if ((SrbEx->SrbExDataOffset[i] < sizeof(STORAGE_REQUEST_BLOCK)) ||
          (SrbEx->SrbExDataOffset[i] >= SrbEx->SrbLength))
      {
        SRBHELPER_ASSERT(FALSE);
        continue;
      }

      SrbExData = (PSRBEX_DATA)((PUCHAR)SrbEx + SrbEx->SrbExDataOffset[i]);

      switch (SrbExData->Type)
      {
          case SrbExDataTypeScsiCdb16:
            if (SrbEx->SrbExDataOffset[i] + sizeof(SRBEX_DATA_SCSI_CDB16) <= SrbEx->SrbLength)
            {
              FoundEntry = TRUE;
              if (CdbLength8)
              {
                ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->CdbLength = *CdbLength8;
              }

              if (ScsiStatus)
              {
                ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->ScsiStatus = *ScsiStatus;
              }

              if (SenseInfoBuffer)
              {
                ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->SenseInfoBuffer = *SenseInfoBuffer;
              }

              if (SenseInfoBufferLength)
              {
                ((PSRBEX_DATA_SCSI_CDB16)SrbExData)->SenseInfoBufferLength = *SenseInfoBufferLength;
              }
            }
            else
            {
              // Catch invalid offset
              SRBHELPER_ASSERT(FALSE);
            }
            break;

          case SrbExDataTypeScsiCdb32:
            if (SrbEx->SrbExDataOffset[i] + sizeof(SRBEX_DATA_SCSI_CDB32) <= SrbEx->SrbLength)
            {
              FoundEntry = TRUE;
              if (CdbLength8)
              {
                ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->CdbLength = *CdbLength8;
              }

              if (ScsiStatus)
              {
                ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->ScsiStatus = *ScsiStatus;
              }

              if (SenseInfoBuffer)
              {
                ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->SenseInfoBuffer = *SenseInfoBuffer;
              }

              if (SenseInfoBufferLength)
              {
                ((PSRBEX_DATA_SCSI_CDB32)SrbExData)->SenseInfoBufferLength = *SenseInfoBufferLength;
              }
            }
            else
            {
              SRBHELPER_ASSERT(FALSE);
            }
            break;

          case SrbExDataTypeScsiCdbVar:
            if (SrbEx->SrbExDataOffset[i] + sizeof(SRBEX_DATA_SCSI_CDB_VAR) <= SrbEx->SrbLength)
            {
              FoundEntry = TRUE;
              if (CdbLength32)
              {
                ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->CdbLength = *CdbLength32;
              }

              if (ScsiStatus)
              {
                ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->ScsiStatus = *ScsiStatus;
              }

              if (SenseInfoBuffer)
              {
                ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->SenseInfoBuffer = *SenseInfoBuffer;
              }

              if (SenseInfoBufferLength)
              {
                ((PSRBEX_DATA_SCSI_CDB_VAR)SrbExData)->SenseInfoBufferLength = *SenseInfoBufferLength;
              }
            }
            else
            {
              SRBHELPER_ASSERT(FALSE);
            }
            break;
      }

      if (FoundEntry)
      {
        break;
      }
    }
  }
}

FORCEINLINE
PCDB
SrbGetCdb(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  PCDB pCdb = NULL;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return SrbGetScsiData(srb, NULL, NULL, NULL, NULL, NULL);
  }
  else
  {
    pCdb = (PCDB)((PSCSI_REQUEST_BLOCK)srb)->Cdb;
  }
  return pCdb;
}

FORCEINLINE
ULONG
SrbGetSrbFunction(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->SrbFunction;
  }
  else
  {
    return (ULONG)((PSCSI_REQUEST_BLOCK)srb)->Function;
  }
}

FORCEINLINE
PVOID
SrbGetSenseInfoBuffer(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  PVOID pSenseInfoBuffer = NULL;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbGetScsiData(srb, NULL, NULL, NULL, &pSenseInfoBuffer, NULL);
  }
  else
  {
    pSenseInfoBuffer = ((PSCSI_REQUEST_BLOCK)srb)->SenseInfoBuffer;
  }
  return pSenseInfoBuffer;
}

FORCEINLINE
UCHAR
SrbGetSenseInfoBufferLength(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR SenseInfoBufferLength = 0;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbGetScsiData(srb, NULL, NULL, NULL, NULL, &SenseInfoBufferLength);
  }
  else
  {
    SenseInfoBufferLength = ((PSCSI_REQUEST_BLOCK)srb)->SenseInfoBufferLength;
  }
  return SenseInfoBufferLength;
}

FORCEINLINE
VOID
SrbSetSenseInfoBuffer(
  _In_ PVOID Srb,
  _In_opt_ PVOID SenseInfoBuffer)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbSetScsiData(srb, NULL, NULL, NULL, &SenseInfoBuffer, NULL);
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->SenseInfoBuffer = SenseInfoBuffer;
  }
}

FORCEINLINE
VOID
SrbSetSenseInfoBufferLength(
  _In_ PVOID Srb,
  _In_ UCHAR SenseInfoBufferLength)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbSetScsiData(srb, NULL, NULL, NULL, NULL, &SenseInfoBufferLength);
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->SenseInfoBufferLength = SenseInfoBufferLength;
  }
}

FORCEINLINE
PVOID
SrbGetOriginalRequest(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->OriginalRequest;
  }
  else
  {
    return ((PSCSI_REQUEST_BLOCK)srb)->OriginalRequest;
  }
}

FORCEINLINE
VOID
SrbSetOriginalRequest(
  _In_ PVOID Srb,
  _In_opt_ PVOID OriginalRequest)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->OriginalRequest = OriginalRequest;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->OriginalRequest = OriginalRequest;
  }
}

FORCEINLINE
PVOID
SrbGetDataBuffer(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  PVOID DataBuffer;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    DataBuffer = srb->DataBuffer;
  }
  else
  {
    DataBuffer = ((PSCSI_REQUEST_BLOCK)srb)->DataBuffer;
  }
  return DataBuffer;
}

FORCEINLINE
VOID
SrbSetDataBuffer(
  _In_ PVOID Srb,
  _In_opt_ __drv_aliasesMem PVOID DataBuffer)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->DataBuffer = DataBuffer;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->DataBuffer = DataBuffer;
  }
}

FORCEINLINE
ULONG
SrbGetDataTransferLength(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  ULONG DataTransferLength;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    DataTransferLength = srb->DataTransferLength;
  }
  else
  {
    DataTransferLength = ((PSCSI_REQUEST_BLOCK)srb)->DataTransferLength;
  }
  return DataTransferLength;
}

FORCEINLINE
VOID
SrbSetDataTransferLength(
  _In_ PVOID Srb,
  _In_ ULONG DataTransferLength)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->DataTransferLength = DataTransferLength;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->DataTransferLength = DataTransferLength;
  }
}

FORCEINLINE
ULONG
SrbGetTimeOutValue(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  ULONG timeOutValue;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    timeOutValue = srb->TimeOutValue;
  }
  else
  {
    timeOutValue = ((PSCSI_REQUEST_BLOCK)srb)->TimeOutValue;
  }
  return timeOutValue;
}

FORCEINLINE
VOID
SrbSetTimeOutValue(
  _In_ PVOID Srb,
  _In_ ULONG TimeOutValue)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->TimeOutValue = TimeOutValue;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->TimeOutValue = TimeOutValue;
  }
}

FORCEINLINE
VOID
SrbSetQueueSortKey(
  _In_ PVOID Srb,
  _In_ ULONG QueueSortKey)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function != SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    ((PSCSI_REQUEST_BLOCK)srb)->QueueSortKey = QueueSortKey;
  }
}

FORCEINLINE
VOID
SrbSetQueueTag(
  _In_ PVOID Srb,
  _In_ ULONG QueueTag)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->RequestTag = QueueTag;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->QueueTag = (UCHAR)QueueTag;
  }
}

#define SrbSetRequestTag SrbSetQueueTag

FORCEINLINE
ULONG
SrbGetQueueTag(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->RequestTag;
  }
  else
  {
    return ((PSCSI_REQUEST_BLOCK)srb)->QueueTag;
  }
}

#define SrbGetRequestTag SrbGetQueueTag

FORCEINLINE
PVOID
SrbGetNextSrb(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return (PVOID)srb->NextSrb;
  }
  else
  {
    return (PVOID)((PSCSI_REQUEST_BLOCK)srb)->NextSrb;
  }
}

FORCEINLINE
VOID
SrbSetNextSrb(
  _In_ PVOID Srb,
  _In_opt_ PVOID NextSrb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->NextSrb = (PSTORAGE_REQUEST_BLOCK)NextSrb;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->NextSrb = (PSCSI_REQUEST_BLOCK)NextSrb;
  }
}

FORCEINLINE
ULONG
SrbGetSrbFlags(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  ULONG srbFlags;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srbFlags = srb->SrbFlags;
  }
  else
  {
    srbFlags = ((PSCSI_REQUEST_BLOCK)srb)->SrbFlags;
  }
  return srbFlags;
}

FORCEINLINE
VOID
SrbAssignSrbFlags(
  _In_ PVOID Srb,
  _In_ ULONG Flags)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->SrbFlags = Flags;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->SrbFlags = Flags;
  }
}

FORCEINLINE
VOID
SrbSetSrbFlags(
  _In_ PVOID Srb,
  _In_ ULONG Flags)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->SrbFlags |= Flags;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->SrbFlags |= Flags;
  }
}

FORCEINLINE
VOID
SrbClearSrbFlags(
  _In_ PVOID Srb,
  _In_ ULONG Flags)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->SrbFlags &= ~Flags;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->SrbFlags &= ~Flags;
  }
}

FORCEINLINE
ULONG
SrbGetSystemStatus(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  ULONG systemStatus;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    systemStatus = srb->SystemStatus;
  }
  else
  {
    systemStatus = ((PSCSI_REQUEST_BLOCK)srb)->InternalStatus;
  }
  return systemStatus;
}

FORCEINLINE
VOID
SrbSetSystemStatus(
  _In_ PVOID Srb,
  _In_ ULONG Status)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->SystemStatus = Status;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->InternalStatus = Status;
  }
}

FORCEINLINE
UCHAR
SrbGetScsiStatus(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR scsiStatus = 0;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbGetScsiData(srb, NULL, NULL, &scsiStatus, NULL, NULL);
  }
  else
  {
    scsiStatus = ((PSCSI_REQUEST_BLOCK)srb)->ScsiStatus;
  }
  return scsiStatus;
}

FORCEINLINE
VOID
SrbSetScsiStatus(
  _In_ PVOID Srb,
  _In_ UCHAR ScsiStatus)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbSetScsiData(srb, NULL, NULL, &ScsiStatus, NULL, NULL);
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->ScsiStatus = ScsiStatus;
  }
}

FORCEINLINE
UCHAR
SrbGetCdbLength(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR CdbLength = 0;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbGetScsiData(srb, &CdbLength, NULL, NULL, NULL, NULL);
  }
  else
  {
    CdbLength = ((PSCSI_REQUEST_BLOCK)srb)->CdbLength;
  }
  return CdbLength;
}

FORCEINLINE
VOID
SrbSetCdbLength(
  _In_ PVOID Srb,
  _In_ UCHAR CdbLength)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    SrbSetScsiData(srb, &CdbLength, NULL, NULL, NULL, NULL);
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->CdbLength = CdbLength;
  }
}

FORCEINLINE
ULONG
SrbGetRequestAttribute(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  ULONG RequestAttribute;
  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    RequestAttribute = srb->RequestAttribute;
  }
  else
  {
    RequestAttribute = ((PSCSI_REQUEST_BLOCK)srb)->QueueAction;
  }
  return RequestAttribute;
}

#define SrbGetQueueAction SrbGetRequestAttribute

FORCEINLINE
VOID
SrbSetRequestAttribute(
  _In_ PVOID Srb,
  _In_ UCHAR RequestAttribute)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->RequestAttribute = RequestAttribute;
  }
  else
  {
    ((PSCSI_REQUEST_BLOCK)srb)->QueueAction = RequestAttribute;
  }
}

#define SrbSetQueueAction SrbSetRequestAttribute

FORCEINLINE
UCHAR
SrbGetPathId(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR PathId = 0;
  PSTOR_ADDRESS storAddr = NULL;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    storAddr = (PSTOR_ADDRESS)SrbGetAddress(srb);
    if (storAddr)
    {
      switch (storAddr->Type)
      {
        case STOR_ADDRESS_TYPE_BTL8:
          PathId = ((PSTOR_ADDR_BTL8)storAddr)->Path;
          break;

        default:
          SRBHELPER_ASSERT(FALSE);
          break;
      }
    }
  }
  else
  {
    PathId = ((PSCSI_REQUEST_BLOCK)srb)->PathId;
  }
  return PathId;
}

FORCEINLINE
UCHAR
SrbGetTargetId(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR TargetId = 0;
  PSTOR_ADDRESS storAddr = NULL;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    storAddr = (PSTOR_ADDRESS)SrbGetAddress(srb);
    if (storAddr)
    {
      switch (storAddr->Type)
      {
        case STOR_ADDRESS_TYPE_BTL8:
          TargetId = ((PSTOR_ADDR_BTL8)storAddr)->Target;
          break;

        default:
          SRBHELPER_ASSERT(FALSE);
          break;
      }
    }
  }
  else
  {
    TargetId = ((PSCSI_REQUEST_BLOCK)srb)->TargetId;
  }
  return TargetId;
}

FORCEINLINE
UCHAR
SrbGetLun(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  UCHAR Lun = 0;
  PSTOR_ADDRESS storAddr = NULL;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    storAddr = (PSTOR_ADDRESS)SrbGetAddress(srb);
    if (storAddr)
    {
      switch (storAddr->Type)
      {
        case STOR_ADDRESS_TYPE_BTL8:
          Lun = ((PSTOR_ADDR_BTL8)storAddr)->Lun;
          break;

        default:
          SRBHELPER_ASSERT(FALSE);
          break;
      }
    }
  }
  else
  {
    Lun = ((PSCSI_REQUEST_BLOCK)srb)->Lun;
  }
  return Lun;
}

FORCEINLINE
VOID
SrbGetPathTargetLun(
  _In_ PVOID Srb,
  _In_opt_ PUCHAR PathId,
  _In_opt_ PUCHAR TargetId,
  _In_opt_ PUCHAR Lun)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;
  PSTOR_ADDRESS storAddr = NULL;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    storAddr = (PSTOR_ADDRESS)SrbGetAddress(srb);
    if (storAddr)
    {
      switch (storAddr->Type)
      {
        case STOR_ADDRESS_TYPE_BTL8:
          if (PathId != NULL)
          {
            *PathId = ((PSTOR_ADDR_BTL8)storAddr)->Path;
          }

          if (TargetId != NULL)
          {
            *TargetId = ((PSTOR_ADDR_BTL8)storAddr)->Target;
          }

          if (Lun != NULL)
          {
            *Lun = ((PSTOR_ADDR_BTL8)storAddr)->Lun;
          }

          break;

        default:
          SRBHELPER_ASSERT(FALSE);
          break;
      }
    }
  }
  else
  {
    if (PathId != NULL)
    {
      *PathId = ((PSCSI_REQUEST_BLOCK)srb)->PathId;
    }

    if (TargetId != NULL)
    {
      *TargetId = ((PSCSI_REQUEST_BLOCK)srb)->TargetId;
    }

    if (Lun != NULL)
    {
      *Lun = ((PSCSI_REQUEST_BLOCK)srb)->Lun;
    }
  }

  return;
}

FORCEINLINE
PVOID
SrbGetMiniportContext(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->MiniportContext;
  }
  else
  {
    return ((PSCSI_REQUEST_BLOCK)srb)->SrbExtension;
  }
}

FORCEINLINE
UCHAR
SrbGetSrbStatus(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->SrbStatus;
  }
  else
  {
    return ((PSCSI_REQUEST_BLOCK)srb)->SrbStatus;
  }
}

FORCEINLINE
VOID
SrbSetSrbStatus(
  _In_ PVOID Srb,
  _In_ UCHAR status)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    if (srb->SrbStatus & SRB_STATUS_AUTOSENSE_VALID)
    {
      srb->SrbStatus = status | SRB_STATUS_AUTOSENSE_VALID;
    }
    else
    {
      srb->SrbStatus = status;
    }
  }
  else
  {
    if (((PSCSI_REQUEST_BLOCK)srb)->SrbStatus & SRB_STATUS_AUTOSENSE_VALID)
    {
      ((PSCSI_REQUEST_BLOCK)srb)->SrbStatus = status | SRB_STATUS_AUTOSENSE_VALID;
    }
    else
    {
      ((PSCSI_REQUEST_BLOCK)srb)->SrbStatus = status;
    }
  }
}

FORCEINLINE
PVOID
SrbGetPortContext(
  _In_ PVOID Srb)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    return srb->PortContext;
  }
  else
  {
    SRBHELPER_ASSERT(FALSE);
    return NULL;
  }
}

FORCEINLINE
VOID
SrbSetPortContext(
  _In_ PVOID Srb,
  _In_ PVOID PortContext)
{
  PSTORAGE_REQUEST_BLOCK srb = (PSTORAGE_REQUEST_BLOCK)Srb;

  if (srb->Function == SRB_FUNCTION_STORAGE_REQUEST_BLOCK)
  {
    srb->PortContext = PortContext;
  }
  else
  {
    SRBHELPER_ASSERT(FALSE);
  }
}

#endif /* (NTDDI_VERSION >= NTDDI_WIN8) */
#endif /* _SRBHELPER_H_ */