IMPLEMENTATION MODULE ByteFiddler;
(*
 *  REPERTOIRE
 *  Release 1.6
 *  By Charles Bradford and Cole Brecheen
 *  (c) Copyright 1985-1992 PMI
 *  Green Bay, Wisconsin
 *  All rights reserved
 *  (414) 468-6040
 *
 *  $Header:   D:/logfiles/mods/bytefidd.mov   1.5   10 Mar 1991 15:25:24   coleb  $
 *
 *)


IMPORT ErrorManager;
IMPORT LowLevel;
IMPORT SYSTEM;


VAR
  Initialized : BOOLEAN;

  PROCEDURE Init();
    BEGIN
      IF Initialized THEN
        RETURN;
      ELSE
        Initialized := TRUE;
      END;
      ErrorManager.Init();
      LowLevel.Init();
    END Init;

  TYPE
    BitRange = [0..15];
    WordConverter =
      RECORD
        CASE : BOOLEAN OF
          TRUE :
          x : SYSTEM.WORD;
        | FALSE :
          lo, hi : CHAR;
        END;
      END;

    LongConverter =
      RECORD
        CASE : BOOLEAN OF
          TRUE: long: LONGINT;
        | FALSE: locard, hicard: CARDINAL;
        END;
      END;


  PROCEDURE BitRangeToInt(TheSet : BITSET; LowBit, HighBit : CARDINAL;
    VAR answer : CARDINAL);
      (*BitRangeToInt lets us specify the bits that store the
      value in which we're interested, and it loads that value
      into the last parameter in the list.*)
    BEGIN
      LowLevel.ShiftLeft(TheSet, 15-HighBit);
    (*Assumes bit 15 is most significant.*)
      LowLevel.ShiftRight(TheSet, LowBit+(15-HighBit));
      answer := CARDINAL(TheSet);
    END BitRangeToInt;


  PROCEDURE BytesToWord(lobyte, hibyte : CARDINAL) : CARDINAL;
    (*Takes two bytes and stores them in a single word. The
    last byte in the parameter list is most significant.*)
    VAR
      conv : WordConverter;
    BEGIN
      conv.lo := CHR(lobyte);
      conv.hi := CHR(hibyte);
      RETURN (CARDINAL(conv.x));
    END BytesToWord;


  PROCEDURE CardinalToDate(TheInt : CARDINAL; VAR month, day, year :
      CARDINAL);
    VAR
      TheSet : BITSET;
    BEGIN
      (*CardinalToDate*)
      TheSet := BITSET(TheInt);
(*
Diagnostics.diagB( 'TheDate', TheSet );
*)
      BitRangeToInt(TheSet, 0, 4, day);
      BitRangeToInt(TheSet, 5, 8, month);
      BitRangeToInt(TheSet, 9, 15, year);
      INC(year, 80);
    END CardinalToDate;


  PROCEDURE CardinalToTime(TheCardinal : CARDINAL; VAR hours,
      minutes, seconds : CARDINAL);
    VAR
      TheSet : BITSET;
    BEGIN
      (*CardinalToTime*)
      TheSet := BITSET(TheCardinal);
(*
Diagnostics.diagB( 'TheTime', TheSet );
*)
      BitRangeToInt(TheSet, 11, 15, hours);
      BitRangeToInt(TheSet, 5, 10, minutes);
      BitRangeToInt(TheSet, 0, 4, seconds);
      seconds := seconds*2;
        (*We double seconds because the operating system stores
        this value in two-second increments.*)
    END CardinalToTime;


  PROCEDURE DateToCardinal(month, day, year : CARDINAL) : CARDINAL;
    CONST
      msg = 'Invalid date';
    VAR
      BitSet1, BitSet2 : BITSET;
      buf : BitRange;
    BEGIN
      (*DateToCardinal*)
      IF year>1900 THEN
        year := year-1900;
      END;
      IF ((year>=80) AND (year<=199)) THEN
        year := year-80;
      ELSE
(*
Diagnostics.diagC( 'year', year );
*)
        ErrorManager.WARN(msg);
      END;
      IF ((month<1) OR (month>12)) THEN
(*
Diagnostics.diagC( 'month', month );
*)
        ErrorManager.WARN(msg);
      END;
      IF ((day<1) OR (day>31)) THEN
(*
Diagnostics.diagC( 'day', day );
*)
        ErrorManager.WARN(msg);
      END;
      BitSet2 := BITSET(0);
      BitSet1 := BITSET(day);
      FOR buf := 0 TO 15 DO
        IF buf IN BitSet1 THEN
          INCL(BitSet2, buf);
        END;
      END;
      BitSet1 := BITSET(month);
      FOR buf := 0 TO 15 DO
        IF buf IN BitSet1 THEN
          INCL(BitSet2, buf+5);
        END;
      END;
      BitSet1 := BITSET(year);
      FOR buf := 0 TO 15 DO
        IF buf IN BitSet1 THEN
          INCL(BitSet2, buf+9);
        END;
      END;
      RETURN CARDINAL(BitSet2);
    END DateToCardinal;


  PROCEDURE HighByte( TheCard: CARDINAL ): CHAR;
    VAR
      tmp: WordConverter;
    BEGIN
      tmp.x := SYSTEM.WORD(TheCard);
      RETURN tmp.hi;
    END HighByte;

  PROCEDURE HighCard( TheLong: LONGINT ): CARDINAL;
    VAR
      tmp: LongConverter;
    BEGIN
      tmp.long := TheLong;
      RETURN tmp.hicard;
    END HighCard;


  PROCEDURE LowByte( TheCard: CARDINAL ): CHAR;
    VAR
      tmp: WordConverter;
    BEGIN
      tmp.x := SYSTEM.WORD(TheCard);
      RETURN tmp.lo;
    END LowByte;

  PROCEDURE LowCard( TheLong: LONGINT ): CARDINAL;
    VAR
      tmp: LongConverter;
    BEGIN
      tmp.long := TheLong;
      RETURN tmp.locard;
    END LowCard;


  PROCEDURE PeekChar( TheAdr: SYSTEM.ADDRESS ): CHAR;
    VAR
      tmp: LowLevel.Address8086;
    BEGIN
      tmp.a := TheAdr;
      RETURN tmp.b^;
    END PeekChar;


  PROCEDURE PokeChar( TheChar: CHAR; TheAdr: SYSTEM.ADDRESS );
    VAR
      tmp: LowLevel.Address8086;
    BEGIN
      tmp.a := TheAdr;
      tmp.b^ := TheChar;
    END PokeChar;


  PROCEDURE Size( VAR AnyObject: ARRAY OF SYSTEM.BYTE ): CARDINAL;
    BEGIN
      RETURN HIGH(AnyObject) + 1;
    END Size;


  PROCEDURE swap(VAR TheWord : SYSTEM.WORD);
(*Reverses the order of the high and low bytes in TheWord.*)
    VAR
      conv : WordConverter;
      tmp : CHAR;
    BEGIN
      conv.x := TheWord;
      tmp := conv.hi;
      conv.hi := conv.lo;
      conv.lo := tmp;
      TheWord := conv.x;
    END swap;


  PROCEDURE TimeToCardinal(hours, minutes, seconds : CARDINAL) : CARDINAL;
    CONST
      msg = 'Invalid time';
    VAR
      BitSet1, BitSet2 : BITSET;
      buf : BitRange;
    BEGIN
      (*TimeToCardinal*)
      IF (hours>23) THEN
(*
Diagnostics.diagC( 'hours', hours );
*)
        ErrorManager.WARN(msg);
      END;
      IF (minutes>59) THEN
(*
Diagnostics.diagC( 'minutes', minutes );
*)
        ErrorManager.WARN(msg);
      END;
      IF (seconds>59) THEN
(*
Diagnostics.diagC( 'seconds', seconds );
*)
        ErrorManager.WARN(msg);
      END;
      BitSet2 := BITSET(0);
      BitSet1 := BITSET(seconds DIV 2);
      FOR buf := 0 TO 15 DO
        IF buf IN BitSet1 THEN
          INCL(BitSet2, buf);
        END;
      END;
      BitSet1 := BITSET(minutes);
      FOR buf := 0 TO 15 DO
        IF buf IN BitSet1 THEN
          INCL(BitSet2, buf+5);
        END;
      END;
      BitSet1 := BITSET(hours);
      FOR buf := 0 TO 15 DO
        IF buf IN BitSet1 THEN
          INCL(BitSet2, buf+11);
        END;
      END;
      RETURN CARDINAL(BitSet2);
    END TimeToCardinal;

BEGIN
  Initialized := FALSE;
  Init();
END ByteFiddler.