unit Base24Unt;
{Base24}
interface
const EncodeTable: array[0..23] of Char ='BCDFGHJKMPQRTVWXY2346789' ;
DecodeTable: array[#0..#127] of Byte = ( 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,17,18,19,25,20,21, 22,23,25,25,25,25,25,25, 25,25, 0, 1, 2,25, 3, 4, 5,25, 6, 7,25, 8,25,25, 9,10,11,25,12,25,13,14, 15,16,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25, 25,25,25,25,25,25,25,25,',',');
function ByteToBase24(buf:array of byte):String;function FormatBase24(sValue:String;Const bAdd:Boolean=False):String;procedure Base24ToByte(sValue:String;var buf:array of byte,',',');
implementation
function ByteToBase24(buf:array of byte):String;var i,j:Integer; K:Longword;begin for i := 24 downto 0 do begin K := 0; for j := High(buf) downto Low(buf) do begin K := (K * 256) + buf[j]; buf[j] := K div 24; K := K mod 24; end; Result :=ConCat(EncodeTable[K],Result,',','); end;end;
procedure Base24ToByte(sValue:String;var buf:array of byte,',',');var i,j:Integer; K:Longword;begin for i:=0 to 24 do begin k:=DecodeTable[sValue[i+1]]; for j:=0 to 14 do begin K:=buf[j]*24+K; buf[j]:=K mod 256; k:=K div 256; end; end;end;
function FormatBase24(sValue:String;Const bAdd:Boolean=False):String;var i,n:Integer;beginResult:='';n:=Length(sValue,',',');for i:=1 to n do begin if bAdd then begin if (i mod 5=0)and(i<>n) then begin Result:=ConCat(Result,sValue[i],'-',',','); continue; end; end else begin if sValue[i]='-' then continue; end; Result:=ConCat(Result,sValue[i],',','); end;
end;
end.
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