fhandler_tape.cc

cygwin, 著名的在win32下模拟unix操作系统的东东

    {
      ret = ERROR_INVALID_PARAMETER;
      if (buf && (ret = tape_get_pos (&block)))
	((struct mtpos *) buf)->mt_blkno = block;
    }
  else
    return fhandler_dev_raw::ioctl (cmd, buf);

  if (ret != NO_ERROR)
    {
      SetLastError (ret);
      __seterrno ();
      return -1;
    }

  return 0;
}

/* ------------------------------------------------------------------ */
/*                  Private functions used by `ioctl'                 */
/* ------------------------------------------------------------------ */

static int
tape_error (DWORD lasterr, const char *txt)
{
  if (lasterr)
    debug_printf ("%s: error: %d", txt, lasterr);

  return lasterr;
}

int
fhandler_dev_tape::tape_write_marks (int marktype, DWORD len)
{
  syscall_printf ("write_tapemark");
  while (((lasterr = WriteTapemark (get_handle (),
				    marktype,
				    len,
				    FALSE)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  return tape_error (lasterr, "tape_write_marks");
}

int
fhandler_dev_tape::tape_get_pos (unsigned long *ret)
{
  DWORD part, low, high;

  while (((lasterr = GetTapePosition (get_handle (),
				      TAPE_ABSOLUTE_POSITION,
				      &part,
				      &low,
				      &high)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;
  if (! tape_error (lasterr, "tape_get_pos") && ret)
    *ret = low;

  return lasterr;
}

static int _tape_set_pos (HANDLE hTape, int mode, long count)
{
  int err;

  while (((err = SetTapePosition (hTape,
				  mode,
				  1,
				  count,
				  count < 0 ? -1 : 0,
				  FALSE)) == ERROR_MEDIA_CHANGED)
	 || (err == ERROR_BUS_RESET))
    ;

  return err;
}

int
fhandler_dev_tape::tape_set_pos (int mode, long count, BOOLEAN sfm_func)
{
  unsigned long pos, tgtpos;

  switch (mode)
    {
      case TAPE_SPACE_RELATIVE_BLOCKS:
	lasterr = tape_get_pos (&pos);

	if (lasterr)
	  return lasterr;

	tgtpos = pos + count;

	while (((lasterr = _tape_set_pos (get_handle (),
					  mode,
					  count)) == ERROR_FILEMARK_DETECTED)
	       || (lasterr == ERROR_SETMARK_DETECTED))
	  {
	    lasterr = tape_get_pos (&pos);
	    if (lasterr)
	      return lasterr;
	    count = tgtpos - pos;
	  }

	if (lasterr == ERROR_BEGINNING_OF_MEDIA && ! tgtpos)
	  lasterr = NO_ERROR;

	break;
      case TAPE_SPACE_FILEMARKS:
	if (count < 0)
	  {
	    if (pos > 0)
	      {
		if ((! _tape_set_pos (get_handle (),
				  TAPE_SPACE_RELATIVE_BLOCKS,
				  -1))
		    || (sfm_func))
		  ++count;
		_tape_set_pos (get_handle (), TAPE_SPACE_RELATIVE_BLOCKS, 1);
	      }

	    while (! (lasterr = _tape_set_pos (get_handle (), mode, -1))
		   && count++ < 0)
	      ;

	    if (lasterr == ERROR_BEGINNING_OF_MEDIA)
	      {
		if (! count)
		  lasterr = NO_ERROR;
	      }
	    else if (! sfm_func)
	      lasterr = _tape_set_pos (get_handle (), mode, 1);
	  }
	else
	  {
	    if (sfm_func)
	      {
		if (_tape_set_pos (get_handle (),
				   TAPE_SPACE_RELATIVE_BLOCKS,
				   1) == ERROR_FILEMARK_DETECTED)
		  ++count;
		_tape_set_pos (get_handle (), TAPE_SPACE_RELATIVE_BLOCKS, -1);
	      }

	    if (! (lasterr = _tape_set_pos (get_handle (), mode, count))
		&& sfm_func)
	      lasterr = _tape_set_pos (get_handle (), mode, -1);
	  }
	break;
      case TAPE_SPACE_SETMARKS:
      case TAPE_ABSOLUTE_BLOCK:
      case TAPE_SPACE_END_OF_DATA:
      case TAPE_REWIND:
	lasterr = _tape_set_pos (get_handle (), mode, count);
	break;
    }

  return tape_error (lasterr, "tape_set_pos");
}

int
fhandler_dev_tape::tape_erase (int mode)
{
  DWORD varlen;
  TAPE_GET_DRIVE_PARAMETERS dp;

  while (((lasterr = GetTapeParameters (get_handle (),
					GET_TAPE_DRIVE_INFORMATION,
					(varlen = sizeof dp, &varlen),
					&dp)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  switch (mode)
    {
      case TAPE_ERASE_SHORT:
	if (! lasterr && ! (dp.FeaturesLow & TAPE_DRIVE_ERASE_SHORT))
	  mode = TAPE_ERASE_LONG;
	break;
      case TAPE_ERASE_LONG:
	if (! lasterr && ! (dp.FeaturesLow & TAPE_DRIVE_ERASE_LONG))
	  mode = TAPE_ERASE_SHORT;
	break;
    }

  return tape_error (EraseTape (get_handle (), mode, FALSE), "tape_erase");
}

int
fhandler_dev_tape::tape_prepare (int action)
{
  while (((lasterr = PrepareTape (get_handle (),
				  action,
				  FALSE)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;
  return tape_error (lasterr, "tape_prepare");
}

BOOLEAN
fhandler_dev_tape::tape_get_feature (DWORD parm)
{
  DWORD varlen;
  TAPE_GET_DRIVE_PARAMETERS dp;

  while (((lasterr = GetTapeParameters (get_handle (),
					GET_TAPE_DRIVE_INFORMATION,
					(varlen = sizeof dp, &varlen),
					&dp)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  if (lasterr)
    return FALSE;

  return ((parm & TAPE_DRIVE_HIGH_FEATURES)
	  ? ((dp.FeaturesHigh & parm) != 0)
	  : ((dp.FeaturesLow & parm) != 0));
}

int
fhandler_dev_tape::tape_get_blocksize (long *min, long *def, long *max, long *cur)
{
  DWORD varlen;
  TAPE_GET_DRIVE_PARAMETERS dp;
  TAPE_GET_MEDIA_PARAMETERS mp;

  while (((lasterr = GetTapeParameters (get_handle (),
					GET_TAPE_DRIVE_INFORMATION,
					(varlen = sizeof dp, &varlen),
					&dp)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  if (lasterr)
    return tape_error (lasterr, "tape_get_blocksize");

  while (((lasterr = GetTapeParameters (get_handle (),
					GET_TAPE_MEDIA_INFORMATION,
					(varlen = sizeof dp, &varlen),
					&mp)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  if (lasterr)
    return tape_error (lasterr, "tape_get_blocksize");

  if (min)
    *min = (long) dp.MinimumBlockSize;
  if (def)
    *def = (long) dp.DefaultBlockSize;
  if (max)
    *max = (long) dp.MaximumBlockSize;
  if (cur)
    *cur = (long) mp.BlockSize;

  return tape_error (lasterr, "tape_get_blocksize");
}

int
fhandler_dev_tape::tape_set_blocksize (long count)
{
  long min, max;
  TAPE_SET_MEDIA_PARAMETERS mp;

  lasterr = tape_get_blocksize (&min, NULL, &max, NULL);

  if (lasterr)
    return lasterr;

  if (count != 0 && (count < min || count > max))
    return tape_error (ERROR_INVALID_PARAMETER, "tape_set_blocksize");

  mp.BlockSize = count;

  return tape_error (SetTapeParameters (get_handle (),
					SET_TAPE_MEDIA_INFORMATION,
					&mp),
		     "tape_set_blocksize");
}

static long long
get_ll (PLARGE_INTEGER i)
{
  long long l = 0;

  l = i->HighPart;
  l <<= 32;
  l |= i->LowPart;
  return l;
}

int
fhandler_dev_tape::tape_status (struct mtget *get)
{
  DWORD varlen;
  TAPE_GET_DRIVE_PARAMETERS dp;
  TAPE_GET_MEDIA_PARAMETERS mp;
  int notape = 0;

  if (! get)
    return ERROR_INVALID_PARAMETER;

  while (((lasterr = GetTapeParameters (get_handle (),
					GET_TAPE_DRIVE_INFORMATION,
					(varlen = sizeof dp, &varlen),
					&dp)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  /* Setting varlen to sizeof DP is by intention, actually! Never set
     it to sizeof MP which seems to be more correct but results in a
     ERROR_MORE_DATA error at least on W2K. */
  if ((lasterr) || (lasterr = GetTapeParameters (get_handle (),
						 GET_TAPE_MEDIA_INFORMATION,
						 (varlen = sizeof dp, &varlen),
						 &mp)))
    notape = 1;

  memset (get, 0, sizeof *get);

  get->mt_type = MT_ISUNKNOWN;

  if (! notape && (dp.FeaturesLow & TAPE_DRIVE_TAPE_REMAINING))
    {
      get->mt_remaining = get_ll (&mp.Remaining);
      get->mt_resid = get->mt_remaining >> 10;
    }

  if ((dp.FeaturesHigh & TAPE_DRIVE_SET_BLOCK_SIZE) && ! notape)
    get->mt_dsreg = mp.BlockSize;
  else
    get->mt_dsreg = dp.DefaultBlockSize;

  if (notape)
    get->mt_gstat |= GMT_DR_OPEN (-1);

  if (! notape)
    {
      if (dp.FeaturesLow & TAPE_DRIVE_GET_ABSOLUTE_BLK)
	tape_get_pos ((unsigned long *) &get->mt_blkno);

      if (! get->mt_blkno)
	get->mt_gstat |= GMT_BOT (-1);

      get->mt_gstat |= GMT_ONLINE (-1);

      if ((dp.FeaturesLow & TAPE_DRIVE_WRITE_PROTECT) && mp.WriteProtected)
	get->mt_gstat |= GMT_WR_PROT (-1);

      if (dp.FeaturesLow & TAPE_DRIVE_TAPE_CAPACITY)
	get->mt_capacity = get_ll (&mp.Capacity);
    }

  if ((dp.FeaturesLow & TAPE_DRIVE_COMPRESSION) && dp.Compression)
    get->mt_gstat |= GMT_HW_COMP (-1);

  if ((dp.FeaturesLow & TAPE_DRIVE_ECC) && dp.ECC)
    get->mt_gstat |= GMT_HW_ECC (-1);

  if ((dp.FeaturesLow & TAPE_DRIVE_PADDING) && dp.DataPadding)
    get->mt_gstat |= GMT_PADDING (-1);

  if ((dp.FeaturesLow & TAPE_DRIVE_REPORT_SMKS) && dp.ReportSetmarks)
    get->mt_gstat |= GMT_IM_REP_EN (-1);

  get->mt_erreg = lasterr;

  get->mt_minblksize = dp.MinimumBlockSize;
  get->mt_maxblksize = dp.MaximumBlockSize;
  get->mt_defblksize = dp.DefaultBlockSize;
  get->mt_featureslow = dp.FeaturesLow;
  get->mt_featureshigh = dp.FeaturesHigh;
  get->mt_eotwarningzonesize = dp.EOTWarningZoneSize;

  return 0;
}

int
fhandler_dev_tape::tape_compression (long count)
{
  DWORD varlen;
  TAPE_GET_DRIVE_PARAMETERS dpg;
  TAPE_SET_DRIVE_PARAMETERS dps;

  while (((lasterr = GetTapeParameters (get_handle (),
					GET_TAPE_DRIVE_INFORMATION,
					(varlen = sizeof dpg, &varlen),
					&dpg)) == ERROR_MEDIA_CHANGED)
	 || (lasterr == ERROR_BUS_RESET))
    ;

  if (lasterr)
    return tape_error (lasterr, "tape_compression");

  if (! (dpg.FeaturesLow & TAPE_DRIVE_COMPRESSION))
    return ERROR_INVALID_PARAMETER;

  if (count)
    {
      dps.ECC = dpg.ECC;
      dps.Compression = count ? TRUE : FALSE;
      dps.DataPadding = dpg.DataPadding;
      dps.ReportSetmarks = dpg.ReportSetmarks;
      dps.EOTWarningZoneSize = dpg.EOTWarningZoneSize;
      lasterr = SetTapeParameters (get_handle (),
				   SET_TAPE_DRIVE_INFORMATION,
				   &dps);

      if (lasterr)
	return tape_error (lasterr, "tape_compression");

      dpg.Compression = dps.Compression;
    }

  return 0;
}