/*
   BAREOS® - Backup Archiving REcovery Open Sourced

   Copyright (C) 2000-2012 Free Software Foundation Europe e.V.
   Copyright (C) 2013-2013 Bareos GmbH & Co. KG

   This program is Free Software; you can redistribute it and/or
   modify it under the terms of version three of the GNU Affero General Public
   License as published by the Free Software Foundation and included
   in the file LICENSE.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.
*/
/*
 * Windows Tape API device abstraction.
 *
 * Kern Sibbald, MM
 *
 * Emulate the Linux st (scsi tape) driver on Microsoft Windows.
 * Robert Nelson, May, 2006 <robertn@the-nelsons.org>
 *
 * Extracted from other source files Marco van Wieringen, December 2013
 */

#include "bareos.h"
#include "stored.h"
#include "generic_tape_device.h"
#include "win32_tape_device.h"

#include "sys/mtio.h"
#if defined(_MSC_VER)
#include <winioctl.h>
#else
#include <ntddstor.h>
#endif
#include <ntddscsi.h>

/*
 * SCSI bus status codes.
 */
#define SCSISTAT_GOOD                  0x00
#define SCSISTAT_CHECK_CONDITION       0x02
#define SCSISTAT_CONDITION_MET         0x04
#define SCSISTAT_BUSY                  0x08
#define SCSISTAT_INTERMEDIATE          0x10
#define SCSISTAT_INTERMEDIATE_COND_MET 0x14
#define SCSISTAT_RESERVATION_CONFLICT  0x18
#define SCSISTAT_COMMAND_TERMINATED    0x22
#define SCSISTAT_QUEUE_FULL            0x28

static inline SHORT Read16BitSigned(const unsigned char *pValue)
{
   return (SHORT)(((USHORT)pValue[0] << 8) | (USHORT)pValue[1]);
}

static inline USHORT Read16BitUnsigned(const unsigned char *pValue)
{
   return (((USHORT)pValue[0] << 8) | (USHORT)pValue[1]);
}

static inline LONG Read24BitSigned(const unsigned char *pValue)
{
   return ((LONG)(((ULONG)pValue[0] << 16) | ((ULONG)pValue[1] << 8) |
                   (ULONG)pValue[2])) << 8 >> 8;
}

static inline ULONG Read24BitUnsigned(const unsigned char *pValue)
{
   return ((ULONG)pValue[0] << 16) | ((ULONG)pValue[1] << 8) | (ULONG)pValue[2];
}

static inline LONG Read32BitSigned(const unsigned char *pValue)
{
   return (LONG)(((ULONG)pValue[0] << 24) | ((ULONG)pValue[1] << 16) |
                 ((ULONG)pValue[2] << 8) |   (ULONG)pValue[3]);
}

static inline ULONG Read32BitUnsigned(const unsigned char *pValue)
{
   return (((ULONG)pValue[0] << 24) | ((ULONG)pValue[1] << 16) |
           ((ULONG)pValue[2] << 8) | (ULONG)pValue[3]);
}

static inline LONGLONG Read64BitSigned(const unsigned char *pValue)
{
   return (LONGLONG)(((ULONGLONG)pValue[0] << 56) | ((ULONGLONG)pValue[1] << 48) |
                     ((ULONGLONG)pValue[2] << 40) | ((ULONGLONG)pValue[3] << 32) |
                     ((ULONGLONG)pValue[4] << 24) | ((ULONGLONG)pValue[5] << 16) |
                     ((ULONGLONG)pValue[6] <<  8) |  (ULONGLONG)pValue[7]);
}

static inline ULONGLONG Read64BitUnsigned(const unsigned char *pValue)
{
   return (LONGLONG)(((ULONGLONG)pValue[0] << 56) | ((ULONGLONG)pValue[1] << 48) |
                     ((ULONGLONG)pValue[2] << 40) | ((ULONGLONG)pValue[3] << 32) |
                     ((ULONGLONG)pValue[4] << 24) | ((ULONGLONG)pValue[5] << 16) |
                     ((ULONGLONG)pValue[6] <<  8) | (ULONGLONG)pValue[7]);
}

typedef struct _TAPE_POSITION_INFO
{
   UCHAR AtPartitionStart:1;
   UCHAR AtPartitionEnd:1;
   UCHAR PartitionBlockValid:1;
   UCHAR FileSetValid:1;
   UCHAR :4;
   UCHAR Reserved1[3];
   ULONG Partition;
   ULONGLONG BlockNumber;
   ULONGLONG FileNumber;
   ULONGLONG SetNumber;
} TAPE_POSITION_INFO, *PTAPE_POSITION_INFO;

typedef struct _TAPE_HANDLE_INFO
{
   HANDLE OSHandle;
   bool bEOD;
   bool bEOF;
   bool bEOT;
   bool bBlockValid;
   ULONG FeaturesLow;
   ULONG FeaturesHigh;
   ULONG ulFile;
   ULONGLONG ullFileStart;

} TAPE_HANDLE_INFO, *PTAPE_HANDLE_INFO;

TAPE_HANDLE_INFO TapeHandleTable[] =
{
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE },
   { INVALID_HANDLE_VALUE }
};

#define NUMBER_HANDLE_ENTRIES (sizeof(TapeHandleTable) / sizeof(TapeHandleTable[0]))

static DWORD GetTapePositionInfo(HANDLE hDevice, PTAPE_POSITION_INFO TapePositionInfo);
static DWORD GetDensityBlockSize(HANDLE hDevice, DWORD *pdwDensity, DWORD *pdwBlockSize);

int win32_tape_device::d_open(const char *pathname, int flags, int mode)
{
   HANDLE hDevice = INVALID_HANDLE_VALUE;
   char szDeviceName[256] = "\\\\.\\";
   int idxFile;
   DWORD dwResult;

   for (idxFile = 0; idxFile < (int)NUMBER_HANDLE_ENTRIES; idxFile++) {
      if (TapeHandleTable[idxFile].OSHandle == INVALID_HANDLE_VALUE) {
         break;
      }
   }

   if (idxFile >= (int)NUMBER_HANDLE_ENTRIES) {
      return EMFILE;
   }

   memset(&TapeHandleTable[idxFile], 0, sizeof(TapeHandleTable[idxFile]));
   if (!IsPathSeparator(pathname[0])) {
       bstrncpy(&szDeviceName[4], pathname, sizeof(szDeviceName) - 4);
   } else {
       bstrncpy(&szDeviceName[0], pathname, sizeof(szDeviceName));
   }

   hDevice = CreateFile(szDeviceName, FILE_ALL_ACCESS, 0, NULL, OPEN_EXISTING, 0, NULL);

   if (hDevice != INVALID_HANDLE_VALUE) {
      PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[idxFile];

      memset(pHandleInfo, 0, sizeof(*pHandleInfo));

      pHandleInfo->OSHandle = hDevice;

      TAPE_GET_DRIVE_PARAMETERS TapeDriveParameters;
      DWORD dwSize = sizeof(TapeDriveParameters);

      dwResult = GetTapeParameters(pHandleInfo->OSHandle, GET_TAPE_DRIVE_INFORMATION, &dwSize, &TapeDriveParameters);
      if (dwResult == NO_ERROR) {
         pHandleInfo->FeaturesLow = TapeDriveParameters.FeaturesLow;
         pHandleInfo->FeaturesHigh = TapeDriveParameters.FeaturesHigh;
      }

      TAPE_POSITION_INFO TapePositionInfo;

      dwResult = GetTapePositionInfo(pHandleInfo->OSHandle, &TapePositionInfo);

      if (dwResult == NO_ERROR) {
         if (TapePositionInfo.AtPartitionStart || TapePositionInfo.AtPartitionEnd ||
             (TapePositionInfo.PartitionBlockValid && TapePositionInfo.BlockNumber == 0)) {
            pHandleInfo->ulFile = 0;
            pHandleInfo->bBlockValid = true;
            pHandleInfo->ullFileStart = 0;
         } else if (TapePositionInfo.FileSetValid) {
            pHandleInfo->ulFile = (ULONG)TapePositionInfo.FileNumber;
         }
      }
   } else {
      DWORD dwError = GetLastError();

      switch (dwError) {
      case ERROR_FILE_NOT_FOUND:
      case ERROR_PATH_NOT_FOUND:
         errno = ENOENT;
         break;
      case ERROR_TOO_MANY_OPEN_FILES:
         errno = EMFILE;
         break;
      case ERROR_ACCESS_DENIED:
      case ERROR_SHARING_VIOLATION:
      case ERROR_LOCK_VIOLATION:
      case ERROR_INVALID_NAME:
         errno = EACCES;
         break;
      case ERROR_FILE_EXISTS:
         errno = EEXIST;
         break;
      case ERROR_INVALID_PARAMETER:
         errno = EINVAL;
         break;
      default:
         errno = EACCES;
         break;
      }

      return(int) -1;
   }

   return (int)idxFile + 3;
}

ssize_t win32_tape_device::d_read(int fd, void *buffer, size_t count)
{
   if (buffer == NULL) {
      errno = EINVAL;
      return -1;
   }

   if (fd < 3 || fd >= (int)(NUMBER_HANDLE_ENTRIES + 3) ||
       TapeHandleTable[fd - 3].OSHandle == INVALID_HANDLE_VALUE) {
      errno = EBADF;
      return -1;
   }

   PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[fd - 3];

   DWORD bytes_read;
   BOOL bResult;

   bResult = ReadFile(pHandleInfo->OSHandle, buffer, count, &bytes_read, NULL);

   if (bResult) {
      pHandleInfo->bEOF = false;
      pHandleInfo->bEOT = false;
      pHandleInfo->bEOD = false;
      return bytes_read;
   } else {
      int iReturnValue = 0;
      DWORD last_error = GetLastError();

      switch (last_error) {
      case ERROR_FILEMARK_DETECTED:
         pHandleInfo->bEOF = true;
         break;
      case ERROR_END_OF_MEDIA:
         pHandleInfo->bEOT = true;
         break;
      case ERROR_NO_MEDIA_IN_DRIVE:
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->bEOD = false;
         errno = ENOMEDIUM;
         iReturnValue = -1;
         break;
      case ERROR_NO_DATA_DETECTED:
         pHandleInfo->bEOD = true;
         break;
      case ERROR_INVALID_HANDLE:
      case ERROR_ACCESS_DENIED:
      case ERROR_LOCK_VIOLATION:
         errno = EBADF;
         iReturnValue = -1;
         break;
      default:
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->bEOD = false;
         errno = EIO;
         iReturnValue = -1;
      }

      return iReturnValue;
   }
}

ssize_t win32_tape_device::d_write(int fd, const void *buffer, size_t count)
{
   if (buffer == NULL) {
      errno = EINVAL;
      return -1;
   }

   if (fd < 3 || fd >= (int)(NUMBER_HANDLE_ENTRIES + 3) ||
       TapeHandleTable[fd - 3].OSHandle == INVALID_HANDLE_VALUE) {
      errno = EBADF;
      return -1;
   }

   PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[fd - 3];
   DWORD bytes_written;
   BOOL bResult;

   bResult = WriteFile(pHandleInfo->OSHandle, buffer, count, &bytes_written, NULL);

   if (bResult) {
      pHandleInfo->bEOF = false;
      pHandleInfo->bEOT = false;
      return bytes_written;
   } else {
      DWORD last_error = GetLastError();

      switch (last_error) {
      case ERROR_END_OF_MEDIA:
      case ERROR_DISK_FULL:
         pHandleInfo->bEOT = true;
         errno = ENOSPC;
         break;
      case ERROR_NO_MEDIA_IN_DRIVE:
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->bEOD = false;
         errno = ENOMEDIUM;
         break;
      case ERROR_INVALID_HANDLE:
      case ERROR_ACCESS_DENIED:
         errno = EBADF;
         break;
      default:
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->bEOD = false;
         errno = EIO;
         break;
      }
      return -1;
   }
}

int win32_tape_device::d_close(int fd)
{
   if (fd < 3 || fd >= (int)(NUMBER_HANDLE_ENTRIES + 3) ||
       TapeHandleTable[fd - 3].OSHandle == INVALID_HANDLE_VALUE) {
      errno = EBADF;
      return -1;
   }

   PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[fd - 3];
   if (!CloseHandle(pHandleInfo->OSHandle)) {
      pHandleInfo->OSHandle = INVALID_HANDLE_VALUE;
      errno = EBADF;
      return -1;
   }

   pHandleInfo->OSHandle = INVALID_HANDLE_VALUE;

   return 0;
}

int win32_tape_device::d_ioctl(int fd, ioctl_req_t request, char *op)
{
   int result = 0;

   if (request == MTIOCTOP) {
      result = tape_op((mtop *)op);
   } else if (request == MTIOCGET) {
      result = tape_get((mtget *)op);
   } else if (request == MTIOCPOS) {
      result = tape_pos((mtpos *)op);
   } else {
      errno = ENOTTY;
      result = -1;
   }

   return result;
}

int win32_tape_device::tape_op(struct mtop *mt_com)
{
   DWORD result = NO_ERROR;
   int   index;

   if (m_fd < 3 || m_fd >= (int)(NUMBER_HANDLE_ENTRIES + 3) ||
       TapeHandleTable[m_fd - 3].OSHandle == INVALID_HANDLE_VALUE) {
      errno = EBADF;
      return -1;
   }

   PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[m_fd - 3];
   switch (mt_com->mt_op) {
   case MTRESET:
   case MTNOP:
   case MTSETDRVBUFFER:
      break;
   case MTRAS1:
   case MTRAS2:
   case MTRAS3:
   case MTSETDENSITY:
      errno = ENOTTY;
      result = (DWORD)-1;
      break;
   case MTFSF:
      for (index = 0; index < mt_com->mt_count; index++) {
         result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, 1, 0, FALSE);
         if (result == NO_ERROR) {
            pHandleInfo->ulFile++;
            pHandleInfo->bEOF = true;
            pHandleInfo->bEOT = false;
         }
      }
      break;
   case MTBSF:
      for (index = 0; index < mt_com->mt_count; index++) {
         result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, (DWORD)-1, ~0, FALSE);
         if (result == NO_ERROR) {
            pHandleInfo->ulFile--;
            pHandleInfo->bBlockValid = false;
            pHandleInfo->bEOD = false;
            pHandleInfo->bEOF = false;
            pHandleInfo->bEOT = false;
         }
      }
      break;
   case MTFSR:
      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_RELATIVE_BLOCKS, 0, mt_com->mt_count, 0, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOD = false;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
      } else if (result == ERROR_FILEMARK_DETECTED) {
         pHandleInfo->bEOF = true;
      }
      break;
   case MTBSR:
      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_RELATIVE_BLOCKS, 0, -mt_com->mt_count, ~0, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOD = false;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
      } else if (result == ERROR_FILEMARK_DETECTED) {
         pHandleInfo->ulFile--;
         pHandleInfo->bBlockValid = false;
         pHandleInfo->bEOD = false;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
      }
      break;
   case MTWEOF:
      result = WriteTapemark(pHandleInfo->OSHandle, TAPE_FILEMARKS, mt_com->mt_count, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOF = true;
         pHandleInfo->bEOT = false;
         pHandleInfo->ulFile += mt_com->mt_count;
         pHandleInfo->bBlockValid = true;
         pHandleInfo->ullFileStart = 0;
      }
      break;
   case MTREW:
      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_REWIND, 0, 0, 0, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOD = false;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->ulFile = 0;
         pHandleInfo->bBlockValid = true;
         pHandleInfo->ullFileStart = 0;
      }
      break;
   case MTOFFL:
      result = PrepareTape(pHandleInfo->OSHandle, TAPE_UNLOAD, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOD = false;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->ulFile = 0;
         pHandleInfo->ullFileStart = 0;
      }
      break;
   case MTRETEN:
      result = PrepareTape(pHandleInfo->OSHandle, TAPE_TENSION, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOD = false;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->ulFile = 0;
         pHandleInfo->bBlockValid = true;
         pHandleInfo->ullFileStart = 0;
      }
      break;
   case MTBSFM:
      for (index = 0; index < mt_com->mt_count; index++) {
         result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, (DWORD)-1, ~0, FALSE);
         if (result == NO_ERROR) {
            result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, 1, 0, FALSE);
            pHandleInfo->bEOD = false;
            pHandleInfo->bEOF = false;
            pHandleInfo->bEOT = false;
         }
      }
      break;
   case MTFSFM:
      for (index = 0; index < mt_com->mt_count; index++) {
         result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, mt_com->mt_count, 0, FALSE);
         if (result == NO_ERROR) {
            result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, (DWORD)-1, ~0, FALSE);
            pHandleInfo->bEOD = false;
            pHandleInfo->bEOF = false;
            pHandleInfo->bEOT = false;
         }
      }
      break;
   case MTEOM:
      while (1) {
         result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_FILEMARKS, 0, 1, 0, FALSE);
         if (result != NO_ERROR) {
            pHandleInfo->bEOF = false;

            if (result == ERROR_END_OF_MEDIA) {
               pHandleInfo->bEOD = true;
               pHandleInfo->bEOT = true;
               return 0;
            }
            if (result == ERROR_NO_DATA_DETECTED) {
               pHandleInfo->bEOD = true;
               pHandleInfo->bEOT = false;
               return 0;
            }
            break;
         } else {
            pHandleInfo->bEOF = true;
            pHandleInfo->ulFile++;
         }
      }
      break;
   case MTERASE:
      result = EraseTape(pHandleInfo->OSHandle, TAPE_ERASE_LONG, FALSE);
      if (result == NO_ERROR) {
         pHandleInfo->bEOD = true;
         pHandleInfo->bEOF = false;
         pHandleInfo->bEOT = false;
         pHandleInfo->ulFile = 0;
         pHandleInfo->bBlockValid = true;
         pHandleInfo->ullFileStart = 0;
      }
      break;
   case MTSETBLK: {
      TAPE_SET_MEDIA_PARAMETERS SetMediaParameters;

      SetMediaParameters.BlockSize = mt_com->mt_count;
      result = SetTapeParameters(pHandleInfo->OSHandle, SET_TAPE_MEDIA_INFORMATION, &SetMediaParameters);
      break;
   }
   case MTSEEK: {
      TAPE_POSITION_INFO TapePositionInfo;

      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_ABSOLUTE_BLOCK, 0, mt_com->mt_count, 0, FALSE);

      memset(&TapePositionInfo, 0, sizeof(TapePositionInfo));
      DWORD dwPosResult = GetTapePositionInfo(pHandleInfo->OSHandle, &TapePositionInfo);
      if (dwPosResult == NO_ERROR && TapePositionInfo.FileSetValid) {
         pHandleInfo->ulFile = (ULONG)TapePositionInfo.FileNumber;
      } else {
         pHandleInfo->ulFile = ~0U;
      }
      break;
   }
   case MTTELL: {
      DWORD partition;
      DWORD offset;
      DWORD offsetHi;

      result = GetTapePosition(pHandleInfo->OSHandle, TAPE_ABSOLUTE_BLOCK, &partition, &offset, &offsetHi);
      if (result == NO_ERROR) {
         return offset;
      }
      break;
   }
   case MTFSS:
      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_SETMARKS, 0, mt_com->mt_count, 0, FALSE);
      break;
   case MTBSS:
      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_SPACE_SETMARKS, 0, -mt_com->mt_count, ~0, FALSE);
      break;
   case MTWSM:
      result = WriteTapemark(pHandleInfo->OSHandle, TAPE_SETMARKS, mt_com->mt_count, FALSE);
      break;
   case MTLOCK:
      result = PrepareTape(pHandleInfo->OSHandle, TAPE_LOCK, FALSE);
      break;
   case MTUNLOCK:
      result = PrepareTape(pHandleInfo->OSHandle, TAPE_UNLOCK, FALSE);
      break;
   case MTLOAD:
      result = PrepareTape(pHandleInfo->OSHandle, TAPE_LOAD, FALSE);
      break;
   case MTUNLOAD:
      result = PrepareTape(pHandleInfo->OSHandle, TAPE_UNLOAD, FALSE);
      break;
   case MTCOMPRESSION: {
      TAPE_GET_DRIVE_PARAMETERS  GetDriveParameters;
      TAPE_SET_DRIVE_PARAMETERS  SetDriveParameters;
      DWORD                      size;

      size = sizeof(GetDriveParameters);

      result = GetTapeParameters(pHandleInfo->OSHandle, GET_TAPE_DRIVE_INFORMATION, &size, &GetDriveParameters);

      if (result == NO_ERROR) {
         SetDriveParameters.ECC = GetDriveParameters.ECC;
         SetDriveParameters.Compression = (BOOLEAN)mt_com->mt_count;
         SetDriveParameters.DataPadding = GetDriveParameters.DataPadding;
         SetDriveParameters.ReportSetmarks = GetDriveParameters.ReportSetmarks;
         SetDriveParameters.EOTWarningZoneSize = GetDriveParameters.EOTWarningZoneSize;

         result = SetTapeParameters(pHandleInfo->OSHandle, SET_TAPE_DRIVE_INFORMATION, &SetDriveParameters);
      }
      break;
   }
   case MTSETPART:
      result = SetTapePosition(pHandleInfo->OSHandle, TAPE_LOGICAL_BLOCK, mt_com->mt_count, 0, 0, FALSE);
      break;
   case MTMKPART:
      if (mt_com->mt_count == 0) {
         result = CreateTapePartition(pHandleInfo->OSHandle, TAPE_INITIATOR_PARTITIONS, 1, 0);
      } else {
         result = CreateTapePartition(pHandleInfo->OSHandle, TAPE_INITIATOR_PARTITIONS, 2, mt_com->mt_count);
      }
      break;
   default:
      errno = ENOTTY;
      result = (DWORD)-1;
      break;
   }

   if ((result == NO_ERROR && pHandleInfo->bEOF) ||
       (result == ERROR_FILEMARK_DETECTED && mt_com->mt_op == MTFSR)) {

      TAPE_POSITION_INFO TapePositionInfo;

      if (GetTapePositionInfo(pHandleInfo->OSHandle, &TapePositionInfo) == NO_ERROR) {
         pHandleInfo->bBlockValid = true;
         pHandleInfo->ullFileStart = TapePositionInfo.BlockNumber;
      }
   }

   switch (result) {
   case NO_ERROR:
   case (DWORD)-1:   /* Error has already been translated into errno */
      break;
   case ERROR_FILEMARK_DETECTED:
      errno = EIO;
      break;
   case ERROR_END_OF_MEDIA:
      pHandleInfo->bEOT = true;
      errno = EIO;
      break;
   case ERROR_NO_DATA_DETECTED:
      pHandleInfo->bEOD = true;
      errno = EIO;
      break;
   case ERROR_NO_MEDIA_IN_DRIVE:
      pHandleInfo->bEOF = false;
      pHandleInfo->bEOT = false;
      pHandleInfo->bEOD = false;
      errno = ENOMEDIUM;
      break;
   case ERROR_INVALID_HANDLE:
   case ERROR_ACCESS_DENIED:
   case ERROR_LOCK_VIOLATION:
      errno = EBADF;
      break;
   default:
      errno = EIO;
      break;
   }

   return result == NO_ERROR ? 0 : -1;
}

int win32_tape_device::tape_get(struct mtget *mt_get)
{
   TAPE_POSITION_INFO pos_info;
   BOOL result;

   if (m_fd < 3 || m_fd >= (int)(NUMBER_HANDLE_ENTRIES + 3) ||
       TapeHandleTable[m_fd - 3].OSHandle == INVALID_HANDLE_VALUE) {
      errno = EBADF;
      return -1;
   }

   PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[m_fd - 3];

   if (GetTapePositionInfo(pHandleInfo->OSHandle, &pos_info) != NO_ERROR) {
      return -1;
   }

   DWORD density = 0;
   DWORD blocksize = 0;

   result = GetDensityBlockSize(pHandleInfo->OSHandle, &density, &blocksize);

   if (result != NO_ERROR) {
      TAPE_GET_DRIVE_PARAMETERS drive_params;
      DWORD size;

      size = sizeof(drive_params);
      result = GetTapeParameters(pHandleInfo->OSHandle, GET_TAPE_DRIVE_INFORMATION, &size, &drive_params);
      if (result == NO_ERROR) {
         blocksize = drive_params.DefaultBlockSize;
      }
   }

   mt_get->mt_type = MT_ISSCSI2;

   /*
    * Partition #
    */
   mt_get->mt_resid = pos_info.PartitionBlockValid ? pos_info.Partition : (ULONG)-1;

   /*
    * Density / Block Size
    */
   mt_get->mt_dsreg = ((density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK) |
                      ((blocksize << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK);

   mt_get->mt_gstat = 0x00010000;  /* Immediate report mode.*/
   if (pHandleInfo->bEOF) {
      mt_get->mt_gstat |= 0x80000000;     /* GMT_EOF */
   }

   if (pos_info.PartitionBlockValid && pos_info.BlockNumber == 0) {
      mt_get->mt_gstat |= 0x40000000;     /* GMT_BOT */
   }

   if (pHandleInfo->bEOT) {
      mt_get->mt_gstat |= 0x20000000;     /* GMT_EOT */
   }

   if (pHandleInfo->bEOD) {
      mt_get->mt_gstat |= 0x08000000;     /* GMT_EOD */
   }

   TAPE_GET_MEDIA_PARAMETERS  media_params;
   DWORD size = sizeof(media_params);

   result = GetTapeParameters(pHandleInfo->OSHandle, GET_TAPE_MEDIA_INFORMATION, &size, &media_params);

   if (result == NO_ERROR && media_params.WriteProtected) {
      mt_get->mt_gstat |= 0x04000000;     /* GMT_WR_PROT */
   }

   result = GetTapeStatus(pHandleInfo->OSHandle);

   if (result != NO_ERROR) {
      if (result == ERROR_NO_MEDIA_IN_DRIVE) {
         mt_get->mt_gstat |= 0x00040000;  /* GMT_DR_OPEN */
      }
   } else {
      mt_get->mt_gstat |= 0x01000000;     /* GMT_ONLINE */
   }

   /*
    * Recovered Error Count
    */
   mt_get->mt_erreg = 0;

   /*
    * File Number
    */
   mt_get->mt_fileno = (__daddr_t)pHandleInfo->ulFile;

   /*
    * Block Number
    */
   mt_get->mt_blkno = (__daddr_t)(pHandleInfo->bBlockValid ? pos_info.BlockNumber - pHandleInfo->ullFileStart : (ULONGLONG)-1);

   return 0;
}

#define  SERVICEACTION_SHORT_FORM_BLOCKID             0
#define  SERVICEACTION_SHORT_FORM_VENDOR_SPECIFIC     1
#define  SERVICEACTION_LONG_FORM                      6
#define  SERVICEACTION_EXTENDED_FORM                  8

typedef struct _SCSI_READ_POSITION_SHORT_BUFFER
{
   UCHAR :1;
   UCHAR PERR:1;
   UCHAR BPU:1;
   UCHAR :1;
   UCHAR BYCU:1;
   UCHAR BCU:1;
   UCHAR EOP:1;
   UCHAR BOP:1;
   UCHAR Partition;
   UCHAR Reserved1[2];
   UCHAR FirstBlock[4];
   UCHAR LastBlock[4];
   UCHAR Reserved2;
   UCHAR NumberBufferBlocks[3];
   UCHAR NumberBufferBytes[4];
}  SCSI_READ_POSITION_SHORT_BUFFER, *PSCSI_READ_POSITION_SHORT_BUFFER;

typedef struct _SCSI_READ_POSITION_LONG_BUFFER
{
   UCHAR :2;
   UCHAR BPU:1;
   UCHAR MPU:1;
   UCHAR :2;
   UCHAR EOP:1;
   UCHAR BOP:1;
   UCHAR Reserved3[3];
   UCHAR Partition[4];
   UCHAR BlockNumber[8];
   UCHAR FileNumber[8];
   UCHAR SetNumber[8];
}  SCSI_READ_POSITION_LONG_BUFFER, *PSCSI_READ_POSITION_LONG_BUFFER;

typedef struct _SCSI_READ_POSITION_EXTENDED_BUFFER
{
   UCHAR :1;
   UCHAR PERR:1;
   UCHAR LOPU:1;
   UCHAR :1;
   UCHAR BYCU:1;
   UCHAR LOCU:1;
   UCHAR EOP:1;
   UCHAR BOP:1;
   UCHAR Partition;
   UCHAR AdditionalLength[2];
   UCHAR Reserved1;
   UCHAR NumberBufferObjects[3];
   UCHAR FirstLogicalObject[8];
   UCHAR LastLogicalObject[8];
   UCHAR NumberBufferObjectBytes[8];
}  SCSI_READ_POSITION_EXTENDED_BUFFER, *PSCSI_READ_POSITION_EXTENDED_BUFFER;

typedef union _READ_POSITION_RESULT {
   SCSI_READ_POSITION_SHORT_BUFFER ShortBuffer;
   SCSI_READ_POSITION_LONG_BUFFER LongBuffer;
   SCSI_READ_POSITION_EXTENDED_BUFFER ExtendedBuffer;
}  READ_POSITION_RESULT, *PREAD_POSITION_RESULT;

static DWORD GetTapePositionInfo(HANDLE hDevice, PTAPE_POSITION_INFO TapePositionInfo)
{
   PSCSI_PASS_THROUGH ScsiPassThrough;
   BOOL bResult;
   DWORD dwBytesReturned;

   const DWORD dwBufferSize = sizeof(SCSI_PASS_THROUGH) + sizeof(READ_POSITION_RESULT) + 28;

   memset(TapePositionInfo, 0, sizeof(*TapePositionInfo));

   ScsiPassThrough = (PSCSI_PASS_THROUGH)malloc(dwBufferSize);

   for (int pass = 0; pass < 2; pass++) {
      memset(ScsiPassThrough, 0, dwBufferSize);

      ScsiPassThrough->Length = sizeof(SCSI_PASS_THROUGH);
      ScsiPassThrough->CdbLength = 10;
      ScsiPassThrough->SenseInfoLength = 28;
      ScsiPassThrough->DataIn = 1;
      ScsiPassThrough->DataTransferLength = sizeof(SCSI_READ_POSITION_LONG_BUFFER);
      ScsiPassThrough->TimeOutValue = 1000;
      ScsiPassThrough->DataBufferOffset = sizeof(SCSI_PASS_THROUGH) + 28;
      ScsiPassThrough->SenseInfoOffset = sizeof(SCSI_PASS_THROUGH);
      ScsiPassThrough->Cdb[0] = 0x34;  /* READ POSITION */

      switch (pass) {
      case 0:
         ScsiPassThrough->Cdb[1] = SERVICEACTION_LONG_FORM;
         break;
      case 1:
         ScsiPassThrough->Cdb[1] = SERVICEACTION_SHORT_FORM_BLOCKID;
         break;
      }

      bResult = DeviceIoControl(hDevice,
                                IOCTL_SCSI_PASS_THROUGH,
                                ScsiPassThrough,
                                sizeof(SCSI_PASS_THROUGH),
                                ScsiPassThrough,
                                dwBufferSize,
                                &dwBytesReturned,
                                NULL);

      if (bResult && dwBytesReturned >= (offsetof(SCSI_PASS_THROUGH, ScsiStatus) + sizeof(ScsiPassThrough->ScsiStatus))) {
         if (ScsiPassThrough->ScsiStatus == SCSISTAT_GOOD) {
            PREAD_POSITION_RESULT   pPosResult = (PREAD_POSITION_RESULT)((PUCHAR)ScsiPassThrough + ScsiPassThrough->DataBufferOffset);

            switch (pass) {
            case 0: {
               /* SERVICEACTION_LONG_FORM */
               TapePositionInfo->AtPartitionStart = pPosResult->LongBuffer.BOP;
               TapePositionInfo->AtPartitionEnd = pPosResult->LongBuffer.EOP;

               if (!TapePositionInfo->PartitionBlockValid) {
                   TapePositionInfo->PartitionBlockValid = !pPosResult->LongBuffer.BPU;
                  if (TapePositionInfo->PartitionBlockValid) {
                     TapePositionInfo->Partition =   Read32BitUnsigned(pPosResult->LongBuffer.Partition);
                     TapePositionInfo->BlockNumber = Read64BitUnsigned(pPosResult->LongBuffer.BlockNumber);
                  }
               }

               TapePositionInfo->FileSetValid = !pPosResult->LongBuffer.MPU;
               if (TapePositionInfo->FileSetValid) {
                  TapePositionInfo->FileNumber =  Read64BitUnsigned(pPosResult->LongBuffer.FileNumber);
                  TapePositionInfo->SetNumber =   Read64BitUnsigned(pPosResult->LongBuffer.SetNumber);
               }
               break;
            }
            case 1: {
               /*
                * SERVICEACTION_SHORT_FORM_BLOCKID
                */
               // pPosResult->ShortBuffer.PERR;
               // pPosResult->ShortBuffer.BYCU;
               // pPosResult->ShortBuffer.BCU;
               TapePositionInfo->AtPartitionStart = pPosResult->ShortBuffer.BOP;
               TapePositionInfo->AtPartitionEnd = pPosResult->ShortBuffer.EOP;

               if (!TapePositionInfo->PartitionBlockValid) {
                  TapePositionInfo->PartitionBlockValid = !pPosResult->ShortBuffer.BPU;
                  if (TapePositionInfo->PartitionBlockValid) {
                     TapePositionInfo->Partition =   pPosResult->ShortBuffer.Partition;
                     TapePositionInfo->BlockNumber = Read32BitUnsigned(pPosResult->ShortBuffer.FirstBlock);
                  }
               }
               // Read32BitsUnsigned(pPosResult->ShortBuffer.LastBlock);
               // Read24BitsUnsigned(pPosResult->ShortBuffer.NumberBufferBlocks);
               // Read32BitsUnsigned(pPosResult->ShortBuffer.NumberBufferBytes);
               break;
            }
            default:
               break;
            }
         }
      }
   }
   free(ScsiPassThrough);

   return NO_ERROR;
}

static DWORD GetDensityBlockSize(HANDLE hDevice, DWORD *pdwDensity, DWORD *pdwBlockSize)
{
   DWORD dwBufferSize = sizeof(GET_MEDIA_TYPES) + 5 * sizeof(DEVICE_MEDIA_INFO);
   GET_MEDIA_TYPES *pGetMediaTypes = (GET_MEDIA_TYPES *)malloc(dwBufferSize);
   BOOL bResult;
   DWORD dwResult;

   if (pGetMediaTypes == NULL) {
      return ERROR_OUTOFMEMORY;
   }

   do {
      DWORD dwBytesReturned;

      bResult = DeviceIoControl(hDevice,
                                IOCTL_STORAGE_GET_MEDIA_TYPES_EX,
                                NULL,
                                0,
                                (LPVOID)pGetMediaTypes,
                                dwBufferSize,
                                &dwBytesReturned,
                                NULL);

      if (!bResult) {
         dwResult = GetLastError();

         if (dwResult != ERROR_INSUFFICIENT_BUFFER) {
            free(pGetMediaTypes);
            return dwResult;
         }

         dwBufferSize += 6 * sizeof(DEVICE_MEDIA_INFO);
         GET_MEDIA_TYPES *pNewBuffer = (GET_MEDIA_TYPES *)realloc(pGetMediaTypes, dwBufferSize);
         if (pNewBuffer != pGetMediaTypes) {
            free(pGetMediaTypes);

            if (pNewBuffer == NULL) {
               return ERROR_OUTOFMEMORY;
            }

            pGetMediaTypes = pNewBuffer;
         }
      }
   } while (!bResult);

   if (pGetMediaTypes->DeviceType != FILE_DEVICE_TAPE) {
      free(pGetMediaTypes);
      return ERROR_BAD_DEVICE;
   }

   for (DWORD idxMedia = 0; idxMedia < pGetMediaTypes->MediaInfoCount; idxMedia++) {
      if (pGetMediaTypes->MediaInfo[idxMedia].DeviceSpecific.TapeInfo.MediaCharacteristics & MEDIA_CURRENTLY_MOUNTED) {
         if (pGetMediaTypes->MediaInfo[idxMedia].DeviceSpecific.TapeInfo.BusType == BusTypeScsi) {
            *pdwDensity = pGetMediaTypes->MediaInfo[idxMedia].DeviceSpecific.TapeInfo.BusSpecificData.ScsiInformation.DensityCode;
         } else {
            *pdwDensity = 0;
         }

         *pdwBlockSize = pGetMediaTypes->MediaInfo[idxMedia].DeviceSpecific.TapeInfo.CurrentBlockSize;

         free(pGetMediaTypes);

         return NO_ERROR;
      }
   }

   free(pGetMediaTypes);

   return ERROR_NO_MEDIA_IN_DRIVE;
}

int win32_tape_device::tape_pos(struct mtpos *mt_pos)
{
   DWORD partition;
   DWORD offset;
   DWORD offsetHi;
   BOOL result;

   if (m_fd < 3 || m_fd >= (int)(NUMBER_HANDLE_ENTRIES + 3) ||
       TapeHandleTable[m_fd - 3].OSHandle == INVALID_HANDLE_VALUE) {
      errno = EBADF;
      return -1;
   }

   PTAPE_HANDLE_INFO pHandleInfo = &TapeHandleTable[m_fd - 3];

   result = GetTapePosition(pHandleInfo->OSHandle, TAPE_ABSOLUTE_BLOCK, &partition, &offset, &offsetHi);
   if (result == NO_ERROR) {
      mt_pos->mt_blkno = offset;
      return 0;
   }

   return -1;
}

win32_tape_device::~win32_tape_device()
{
}

win32_tape_device::win32_tape_device()
{
}
