format  Sint32 GFS_Init (Sint32 open_max, void * work, GfsDirTbl * dirtbl)
 Input  open_max: Maximum number of files opened simultaneously (1 to 24)
 work  work: work area for the library
 directory  dirtbl: Directory information management structure
 Output  dirtbl: Directory information management structure (directory information storage area)
 Function value  Number of directory information read. If an error occurs, a negative error code is returned.
 .
 Function  Performs file system initialization and CD-ROM mount processing.
 Directory management function is specified by specifying  dirtbl. 

dirtbl	Directory management function to use
Directory management structure	Directory management for this library
NULL	CD block file system directory management

  Remarks  (a) work must be placed on a 4-byte boundary.
:  (b) The SCU level 0-DMA end interrupt is enabled by the INT_ChgMsk function.
  (c) Initialize the CD block as follows.
  (ECC count and retry count are set to the maximum values, otherwise the default is
 . )
  CD block soft reset: No
: -Subcode decoding: No
. -Mode 2 subheader recognition: Suru
  Form 2 lead retry: No
: -CD-ROM data read: Maximum speed (currently double speed)
  Standby time: 180 seconds
. . ECC count: 5 times.
  ・ Retry count: 15 times 

  format  Sint32 GFS_LoadDir (Sint32 fid, GfsDirTbl * dirtbl)
 Input  fid: Directory file identifier
:  dirtbl: Directory information management structure
 Output  dirtbl: Directory information management structure (directory information storage area)
 Function value  Number of directories read. If an error occurs, a negative error code is returned.
. 
 Function  Reads directory information from the specified directory file.
 Directory location of directory information changes depending on the specification of  dirtbl. 

dirtbl	Directory information storage area
Directory management structure	dirtbl directory information storage area
NULL	File management information area in CD block

   Uses CD block file system with GFS_Init when NULL is specified for dirtbl
If you do not declare  , an error will occur.
:  However, a pointer to an appropriate directory information management structure other than NULL in dirtbl
It is always possible to pass  .