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RCOS C++ CRC for class FsIface

Responsibilities:

 class FsIface {
 private:
    Knl    *pTx;                 // copy of Exec Message dispatcher
    UINT16  uID;                 // copy of Exec unique identifier
    UINT16  uMagic;              // "magic" number to offset array base
    PXFCB   pXfcb[MAX_FILES];    // files per process
    BOOL    ExpandName (char*, char*, UINT16); // expand name with wild card
    inline  UINT16 Idx (HANDLE h) { return (UINT16)h - uMagic; }
  public:
    FsIface (UINT16, Knl*);
   ~FsIface (void);
    UINT16 IsEof (HANDLE);                       // check for End of File
    UINT16 Open (HANDLE, UINT16 = FS_Ok);        // open existing file
    UINT16 Close (HANDLE, UINT16 = FS_Ok);       // close and maybe flush
    UINT16 Delete (HANDLE, UINT16 = FS_Ok);      // delete if exists
    UINT16 Creat (HANDLE, UINT16 = FS_Ok);       // create new
    UINT16 CloseAll (UINT16 = FS_Ok);            // close and flush all
    UINT16 Read (HANDLE, char&, UINT16 = FS_Ok); // read a char
    UINT16 Read (HANDLE, char*, UINT16 = FS_Ok); // read delimited string
    UINT16 Write (HANDLE, char, UINT16 = FS_Ok); // write single char
    UINT16 Write (HANDLE, char*,UINT16 = FS_Ok); // write null terminated
    UINT16 Stat (HANDLE, UINT16 = FS_Ok);        // get (open) file size
    UINT16 FindFirst (HANDLE, UINT16 = FS_Ok);   // locate first by template
    UINT16 FindNext (HANDLE, UINT16 = FS_Ok);    // repeat for next match
    UINT16 Allocate (HANDLE&, char*);            // ask for a new XFCB
  };