IMPLEMENTATION MODULE FileIO ;

FROM SYSTEM IMPORT ADR ;
FROM StreamFile IMPORT Open, Close ;
FROM IOChan IMPORT ChanId, RawRead, RawWrite ;
FROM ChanConsts IMPORT FlagSet, OpenResults, readFlag, writeFlag,
  oldFlag, rawFlag, opened ;

VAR
  fs : FlagSet ;
  cid : ChanId ;
  res : OpenResults ;

PROCEDURE ReadFile (name: ARRAY OF CHAR; VAR data: ARRAY OF CHAR;
                    VAR got: CARDINAL) : BOOLEAN ;
BEGIN
  fs := FlagSet {readFlag, oldFlag, rawFlag} ;
  Open (cid, name, fs, res) ;
  IF res # opened THEN
    RETURN FALSE ;
  END ;
  RawRead (cid, ADR (data), HIGH (data) + 1, got) ;
  Close (cid) ;
  RETURN TRUE ;
END ReadFile ;

PROCEDURE WriteFile (name: ARRAY OF CHAR; VAR data: ARRAY OF CHAR;
                     n: CARDINAL) : BOOLEAN ;
BEGIN
  fs := FlagSet {writeFlag, rawFlag} ;
  Open (cid, name, fs, res) ;
  IF res # opened THEN
    RETURN FALSE ;
  END ;
  RawWrite (cid, ADR (data), n) ;
  Close (cid) ;
  RETURN TRUE ;
END WriteFile ;

END FileIO.