format  Bool GFS_IsEof (GfsHngfs)
 Input  gfs: File handle
 Output  None
 Function value  File end flag.
 Function  Checks whether the access pointer has reached the end of the file. function
The  value  has the following meaning:
  TRUE: The end of the file has been reached.
  FALSE: The end of the file has not been reached.
:  If an invalid file handle is entered, it is considered that the end of the file has been reached.
.  

  format  Sint32 GFS_ByteToSct (GfsHngfs, Sint32 nbyte)
 Input  gfs: File handle
  nbyte: number of bytes
 Output  None
 Function value  Number of sectors. Negative error code on error.
 Function  Converts units from bytes to sectors (nsct). The sector unit length nsct is calculated as follows:
 Calculated using the formula . 

  nsct = (nbyte + file sector length-1) / file sector length; 

  If the sector length is indefinite (mixed Form1 and Form2), 0 is the function value. 

  format  void GFS_GetFileSize (GfsHngfs, Sint32 * sctsize, Sint32 * nsct,
 S  * lastsize)
 Input  gfs: File handle
 Output  sctsize: Sector length
  nsct: Number of sectors (excluding the last sector)
 last  lastsize: number of bytes occupied by file data in the last sector
 Function value  None
 Function  Acquires information for determining the file size. sctsize, nsct, lastsize
If NULL is specified for . , output of the information can be suppressed.
  The file size (fsize) can be calculated using the following formula. 

  fsize = sctsize * (nsct-1) + lastsize; 

 Remarks  When the lastsize is 2048 bytes in the form2 file, 2324 bytes in the last sector
 must be processed as containing  data.